DE112017006790T5 - Power supply device and power supply system - Google Patents

Abstract

A power supply device (U) comprising: a switch (21) closer to a lead storage battery (11) and a switch (22) closer to a lithium ion storage battery (12) than a first connection point (N1) on an electrical path (L1 , L2); and a switch (23) closer to the lead storage battery (11) and a switch (24) closer to the lithium ion storage battery (12) than a second connection point (N4) on an electrical path (L3, L4). While an exciting current of a rotary electric machine (14) flows through the electric path (L1, L2) and one of the switches (23, 24) is closed, a control section (51) temporarily closes the switches (23, 24) and changes the closed one Switch between the switches (23, 24) under the condition that, with the switches closed, a predetermined reducing state has occurred in which a current flowing through the electrical path (L3, L4) has been reduced.

Description

[Cross-reference to related applications]

This application is based both on the pamphlet submitted on January 11, 2017 JP 2017-002 801 A as well as on the document submitted on 13 March 2017 JP 2017-002 801 A , the descriptions of which are incorporated herein by reference.

[Technical Field of the Invention]

The present invention relates to a power supply apparatus applied to a power supply system having a plurality of storage batteries and to the power supply system.

Background of the Invention

Conventional power supply systems mounted on vehicles or the like include a system (eg, Patent Literature 1) in which a lead storage battery and a lithium ion storage battery are connected in parallel to a power generation device (eg, integrated starter power generator). ISG) or the like), and the lead storage battery and the lithium ion storage battery are connected in parallel with an electric load. In the vehicle-mounted power supply system, the two storage batteries are selectively used to supply various electrical consumers with electrical energy, and the storage batteries are selectively charged with electrical energy from the ISG. In such a power system, a respective switch on a first electrical path between the ISG and the lead storage battery, on a second electrical path between the ISG and the lithium ion storage battery, on a third electrical path between the electrical load and the lead Storage battery and provided on a fourth electrical path between the electrical load and the lithium-ion storage battery. The charging and discharging of the storage batteries is controlled by opening or closing the switches.

[Citation List]

[Patent Literature]

PTL 1: JP 2015-93 554 A

Summary of the invention

When a storage battery serving as a power source from which the electric load is energized is switched between the lead storage battery and the lithium ion storage battery, power is supplied continuously by applying both the third electric path and the third the fourth electrical path switch are temporarily closed. This prevents a power failure when electric power is needed from the electrical load. Such a switching control is particularly necessary when a constant voltage load is present, which permanently requires electrical energy.

However, when the ISG is charged by the first electrical path or the second electrical path, a relatively large power generation current generated by power generation by the ISG flows through the first electrical path or the second electrical path. When both switches provided on the third electrical path and on the fourth electrical path are closed so that the third electrical path and the fourth electrical path are energized, the power generation current flowing through the first electrical path or the second electrical path thus flows through the third electrical path and the fourth electrical path. In this case, an overcurrent can flow through the switches provided on the third electrical path and the fourth electrical path.

The present invention has been made in view of the above-mentioned problem and its object is to provide a power supply apparatus and a power supply system capable of preventing an overcurrent from flowing through a switch while continuously carrying an electrical load Energy is supplied.

In order to solve the above problem, a first aspect of the invention is a power supply apparatus applied to a power supply system in which a first storage battery and a second storage battery are connected in parallel with a rotary electric machine, and the first storage battery and the second storage battery are parallel to the electrical load, wherein the power supply device includes: a first path provided between the first storage battery and the second storage battery, through which a field current of the rotary electric machine flows; a first switch provided on the first path closer to the first storage battery than a first connection point to the rotary electric machine; a second switch provided on the first path closer to the second storage battery than the first connection point; a second path, one end of which is a place which is closer to the first storage battery than the first switch on the first path, and whose other end is connected to a position closer to the second storage battery than the second switch, and which supplies an electric power supply path to the first storage battery electrical load is; a third switch provided on the second path closer to the first storage battery than a second connection point to the electrical load; a fourth switch provided on the second path closer to the second storage battery than the second connection point; and a switch control device controlling the switches, wherein in a situation in which the exciting current of the rotary electric machine flows through the first path while the third switch or the fourth switch is in a closed state, when the switch control device switches the switch in a closed state between the third switch and the fourth switch, the switch control device causes the third switch and the fourth switch to temporarily switch to a closed state and performs the change under the condition that a predetermined reduction state has occurred while the closed state is held in that an electrical current flowing through the second path and flowing through the second path has been reduced.

In the power supply apparatus of the foregoing configuration, an exciting current flows through the first path between the rotary electric machine and each of the first storage batteries and the second storage batteries. Further, the electric load is supplied with electric power from the first storage battery and the second storage battery through the second electric path. Which one of the first storage battery and the second storage battery supplies the rotating electric machine with exciting current is controlled by opening or closing the first switch and the second switch. Whichever of the first storage battery and the second storage battery supplies electric power to the electric load is controlled by opening or closing the third switch and the fourth switch.

In a situation where the exciting current of the rotary electric machine flows through the first path while the third switch or the fourth switch is in a closed state, in a case where the switch is in a closed state between the third switch and the fourth switch is changed, and both the third switch and the fourth switch are caused to be temporarily in a closed state, there may be a disturbance when a field current (large current) of the rotary electric machine passing through the first path flows, flows into the second path, so that an excessive current flows through the switches. In this regard, with the above configuration, the change of the switch in a closed state between the third switch and the fourth switch is carried out under the condition that the predetermined reducing state has occurred in which an electric current flowing through the second path has been reduced. In this case, the disturbance caused by a large current flowing in the second path can be prevented. As a result, when the changeover between the third switch and the fourth switch is performed, it is possible to prevent an excessive current for allowable current of the switches from flowing through the switches while the electric load is continuously supplied with power.

According to a second aspect of the invention, in a situation in which the exciting current of the rotary electric machine flows through the first path, the switch control device switches the switch in a closed state between the third switch and the fourth switch, so that the switch is in a closed state the fourth switch is switched to the third switch or from the third switch to the fourth switch; and when the switch control device performs the changeover between the third switch and the fourth switch, the switch control device determines that the predetermined reduction state has occurred under the condition that the first switch and the second switch are in a closed state before the opening of the fourth or third switch State, and then the switch control device performs the changeover between the third switch and the fourth switch.

With the above configuration, in a closed state in a situation where the exciting current of the rotary electric machine flows through the first path, the switch is changed between the third switch and the fourth switch such that the switch is in a closed state from the fourth switch is switched to the third switch (or from the third switch to the fourth switch). At this time, if the first switch or the second switch is opened, the electric path (first path) between the rotary electric machine and the second storage battery (or the first storage battery) is interrupted. This can cause a large current to flow through the second path into the fourth switch or into the third switch. For example, if commands are issued simultaneously to open the second switch and the fourth switch, this situation may arise due to a different operating delay of the switch or the like occur.

In this regard, when the changeover between the third switch and the fourth switch is performed with the foregoing configuration, it is determined that the predetermined reduction state has occurred under the condition that the first switch and the second switch are kept in a closed state before the switch third switch and the fourth switch are opened, and then the change between the third switch and the fourth switch is executed. Thus, when the switch is changed in a closed state between the third switch and the fourth switch, the disturbance caused by a large current flowing in the second path can be prevented.

A third aspect is the above-mentioned power supply apparatus that further includes an abnormality determination section that determines that an abnormality has occurred with respect to the charging and discharging of the second storage battery, wherein: if it is determined that the abnormality has occurred, the fourth switch or the third one Switch is opened as a fail-safe operation; and when the fail-safe operation is performed in a situation where the exciting current of the rotary electric machine flows through the first path, the switch control device determines that the predetermined reducing state has occurred under the condition that the first switch and the second switch are before the opening of the fourth or third switch are in a closed state, and the switch control device subsequently performs the changeover between the third switch and the fourth switch.

When the fail-safe operation is performed and the switch is changed in a closed state between the third switch and the fourth switch, the disturbance caused by a large current flowing in the second path in this case can be prevented. In addition, the electrical load can be continuously supplied with electrical energy.

In a situation where the exciting current of the rotary electric machine flows through the first path when the switch control device performs the changeover between the third switch and the fourth switch, the switch control device determines that the predetermined reducing state has occurred under the condition that the change has been requested and then the exciting current has been reduced, and then performs the switch control device from the change.

When the exciting current of the rotary electric machine is reduced, an electric current flowing through the second path is reduced, and it is determined with the foregoing configuration that the predetermined reducing state has occurred. When the switch is changed in a closed state in this case between the third switch and the fourth switch, the interference caused by a large current flowing in the second path can also be prevented.

A fifth aspect is applied to a vehicle including the rotary electric machine and a motor and having an idling-stop function in which automatic stopping of the engine and restart of the engine are performed by power-driven driving of the rotary electric machine with: an abnormality determination section that determines that an abnormality has occurred with respect to the charging and discharging of the second storage battery; and a changing section that, when the engine is restarted by the power-driven drive of the rotary electric machine, changes a storage battery serving as a supply source for the rotary electric machine under the condition that it is determined that an abnormality has occurred.

Thus, in a case where it is determined that the abnormality has occurred upon restart of the engine, the rotary electric machine can be suitably supplied with electric power.

In a situation where the exciting current of the rotary electric machine flows through the first path, while at least one of the When the first switch and the second switch are in a closed state and one of the third switch and the fourth switch is in a closed state, when the switch control device changes the switch in a closed state between the third switch and the fourth switch, the switch control device operates as shown in FIG a sixth aspect that the first switch and the second switch are in a closed state, and then causes all the switches to be temporarily in a closed state, and the switch control device determines that the predetermined reduction state has occurred under the condition that that all the switches are in a closed state, and then the switch control device executes the change by causing one of the third switches and the fourth switch to be in an open state, and then it causes at least one of the first switch and the second switch to be in an open state.

When the changeover between the third switch and the fourth switch is performed, it is possible with the foregoing configuration to prevent a situation in which the third switch and the fourth switch are in a closed state and one of the first switch and the second switch is opened. Thus, when the switch is changed in a closed state between the third switch and the fourth switch, the disturbance caused by a large current flowing in the second path can be prevented.

According to a seventh aspect, when an automatic stop condition, a power generation stop condition, or an execution condition is satisfied, the switch control apparatus executes the change between the switches, wherein the automatic stop condition is a condition for executing an automatic stop of an automatic stop Motors is the power generation stop condition is a condition for stopping the power generation by the rotary electric machine, and the execution condition is a condition for charging the first storage battery and for supplying the electrical load with electrical energy of the second storage battery.

When the automatic stop condition, the power generation stop condition or the execution condition is satisfied, the change between the switches can be performed regardless of a state of the rotary electric machine.

According to an eighth aspect, the first path is a large current path in which a permissible current is large compared to the second path.

For example, the first switch and the second switch are provided on the first path. The first switch and the second switch each consist of a plurality of parallel switching elements. In the second path, the third switch and the fourth switch are provided. The third switch and the fourth switch each consist of parallel-connected switching elements whose number is smaller than the number of parallel-connected switching elements in the first switch and in the second switch, or of non-parallel switching elements. When the exciting current (large current) of the rotary electric machine flowing through the first path flows into the second path, a disturbance may be caused in this case. However, the above configuration makes it possible to appropriately prevent the trouble.

A ninth aspect is a power supply system including: the power supply device; the first storage battery; the second storage battery; and the rotating electric machine.

In the power supply system, it is possible to prevent an excessive current from flowing through the switch for a proper current of the switch.

A tenth aspect includes a display device that instructs the switch control device about a time for performing the change.

This makes it possible to carry out the change at an appropriate time.

list of figures

• 1 ein elektrisches Schaltdiagramm zeigt, das ein Energieversorgungssystem zeigt;
• 2 (a) und (b) elektrische Schaltdiagramme zeigen, die die energetisierten Zustände in einem IG ON Zustand zeigen, und 2 (c) ein elektrisches Schaltdiagramm zeigt, das einen energetisierten Zustand in einem Ausfallsicherungsvorgang zeigt;
• 3 (a) bis (c) elektrische Schaltdiagramme zeigen, die eine Situation zeigen, in der ein Überversorgungsstrom fließt;
• 4 ein Flussdiagramm zeigt, das einen Öffnungs- und einen Schließvorgang zeigt;
• 5 ein Zeitdiagramm zeigt, das Öffnungs- und Schließzeitpunkte zeigt;
• 6 ein Flussdiagramm zeigt, das einen Öffnungs- und einen Schließvorgang eines zweiten Ausführungsbeispiels zeigt;
• 7 ein Zeitdiagramm zeigt, das Öffnungs- und Schließzeitpunkte des zweiten Ausführungsbeispiels zeigt;
• 8 ein Flussdiagramm zeigt, das einen Wechselvorgang eines vierten Ausführungsbeispiels zeigt;
• 9 ein Zeitdiagramm zeigt, das Öffnungs- und Schließzeitpunkte des vierten Ausführungsbeispiels zeigt;
• 10 ein Flussdiagramm zeigt, das einen Wechselvorgang eines fünften Ausführungsbeispiels zeigt; und
• 11 ein Zeitdiagramm zeigt, das Öffnungs- und Schließzeitpunkte des fünften Ausführungsbeispiels zeigt.

The above-described object and other objects, features and advantages of the present disclosure will become more apparent from the following description with reference to the accompanying drawings, in which:

• 1 an electrical circuit diagram showing a power supply system;
• 2 (a) and (b) show electrical circuit diagrams showing the energized states in an IG ON state, and 2 (c) shows an electrical circuit diagram showing an energized state in a fail-safe operation;
• 3 (a) Fig. 11 (c) shows electrical circuit diagrams showing a situation in which an over supply current flows;
• 4 a flowchart showing an opening and a closing operation;
• 5 shows a timing chart showing opening and closing timings;
• 6 a flowchart showing an opening and a closing operation of a second embodiment;
• 7 shows a timing chart showing opening and closing timings of the second embodiment;
• 8th Fig. 10 is a flowchart showing a changing operation of a fourth embodiment;
• 9 shows a timing chart showing opening and closing timings of the fourth embodiment;
• 10 Fig. 10 is a flowchart showing a changing operation of a fifth embodiment; and
• 11 shows a timing chart showing opening and closing timings of the fifth embodiment.

Description of the embodiments

(First embodiment)

Embodiments of the present disclosure will be described below with reference to the drawings. In the following description, the same or similar parts are given the same reference numerals in the drawings. The present embodiment includes a vehicle-mounted power supply system that supplies electric power to various devices of the vehicle in a vehicle driving by means of an engine (internal combustion engine) as a drive source.

As in 1 As shown, the power supply system is a dual power supply system with a lead storage battery 11 and a lithium-ion storage battery 12 , The storage batteries 11 and 12 can be an electrical load 13 and an electrical load 15 supply with electrical energy. Furthermore, the storage batteries 11 and 12 by a rotating electric machine 14 getting charged. In this system are the lead storage battery 11 and the lithium-ion storage battery 12 parallel to the rotating electrical machine 14 switched, and the lead-storage battery 11 and the lithium-ion storage battery 12 are parallel to the electrical load 15 connected. In the present embodiment, the lead storage battery corresponds 11 a "first storage battery", and the lithium-ion storage battery 12 corresponds to a "second storage battery", however, the lead storage battery 11 and the lithium-ion storage battery 12 interchangeable.

The lead storage battery 11 is a known universally applicable storage battery. The lithium ion storage battery 12 whereas, it is a high-density storage battery which has little energy loss during charging and discharging and both a higher output density and a higher energy density than the lead storage battery 11 having. The lithium ion storage battery 12 is preferably a storage battery with high energy efficiency during charging and discharging compared to the lead storage battery 11 , In addition, the lithium-ion storage battery 12 as a storage battery pack having a plurality of individual storage batteries. The storage batteries 11 and 12 have the same rated voltage as, for example, 12 volts.

Although not expressly described with reference to the drawings, the lithium-ion storage battery is 12 is configured as a storage battery unit U accommodated in a housing and integrated with a substrate. In the present embodiment, the storage battery unit U represents a "power supply device" 1 the storage battery unit U is surrounded by a dotted line. The storage battery unit U includes external terminals P0 . P1 and P2 , The lead storage battery 11 and the electrical load 13 are with the external connection P0 connected, the rotating electric machine 14 is with the external connection P1 connected, and the electrical load 13 is with the external connection P2 connected.

The rotating electric machine 14 is a power generating device having a motor function including a three-phase AC motor and a converter as an electric power conversion device. The rotating electric machine 14 is set up as a mechanical and electrical ISG. The rotating electric machine 14 has a power generation function in which electric power generation (regenerative power generation) is performed by rotating an engine output shaft or axle and an energy operation function for providing a rotational force to the engine output shaft. The power operation function of the rotating electric machine 14 may impart a rotational force to the engine when the engine, which has been automatically stopped at idle, is restarted. The rotating electric machine 14 supplies the storage batteries 11 and 12 and the electrical load 15 with the generated electrical energy.

The electrical load 15 includes a constant voltage load at which a voltage of the supplied power must be constant or vary within a predetermined range. The electrical load 15 can be referred to as a protected load. In addition, it should also be said that the electrical load 15 is a load that does not allow a power failure.

Concrete examples of the electrical load 15 , which is a constant voltage requiring a load, is a navigation device, an audio device, a measuring device, and various ECUs, such as an engine control device. In this case, by avoiding voltage fluctuations of the supplied energy, the occurrence of unnecessary reset and the like in the above apparatuses is prevented, thus achieving stable operation. As an electrical load 15 may be included actuator members such as an electric steering device and a braking device.

The electrical load 13 is a general electrical load, other than the load requiring constant voltage. You can talk about the electrical load 13 also say that it is a load compared to the electric load 15 , a failure of the power supply allows. Concrete examples of an electrical load 13 are a starter, a seat heating, a defroster heater for a rear window, a headlight, a windshield wiper and an air-driven fan of an air conditioner.

Below is the storage battery unit U described. The storage battery unit U includes an electrical path as electrical paths in the unit L1 who has the external connection P0 with the external connection P1 connects, and an electrical path L2 who is a liaison N1 on the electrical path L1 with the lithium ion storage battery 12 combines. A switch 21 is on the electrical path L1 provided, and a switch 22 is on the electrical path L2 intended. The lead storage battery 11 and the lithium-ion storage battery 12 be through the electrical paths L1 and L2 with from the rotating electric machine 14 supplied electrical energy supplied. On the electrical path from the lead storage battery 11 to the lithium-ion storage battery 12 is between the external connection P0 and the connection point N1 to the rotating electric machine 14 the desk 21 provided, and the switch 22 is closer to the lithium ion storage battery 12 provided as it is the connection point N1 is. The electrical path from the external connection P0 to the lithium-ion storage battery 12 corresponds to a "first path", and the junction N1 corresponds to a first connection point. In the present embodiment, the switch corresponds 21 a "first switch", and the switch 22 corresponds to a "second switch", the switch 21 and 22 are however interchangeable.

In addition to the electrical paths L1 and L2 The storage battery unit U of the present embodiment includes an electric path L3 who is a liaison N2 (a place between the external connection P0 and the switch 21 ) on the electrical path L1 with the external connection P2 combines. The electrical path L3 forms a path that allows the electrical load 15 with electrical energy from the lead storage battery 11 is supplied. A switch 23 is on the electrical path L3 (Specifically at a point between the liaison office N2 and a connection point N4 ) intended.

Furthermore, the storage battery unit U includes an electrical path L4 that is a connection point N3 (a place between the switch 33 and the lithium ion storage battery 12 ) on the electrical path L2 with the connection point N4 (a place between the switch 23 and the external connection P2 ) on the electrical path L3 combines. The electrical path L4 forms a path that allows the electrical load 15 with electrical energy from the lithium-ion storage battery 12 is supplied. A switch 24 is on the electrical path L4 (Specifically at a point between the liaison office N3 and the connection point N4 ) intended.

On the electrical path from the lead storage battery 11 to the lithium-ion storage battery 12 is between the external connection P0 and the connection point N4 the desk 23 provided, and the switch 24 is closer to the lithium ion storage battery 12 provided as the connection point N4 , In the present embodiment, the electrical path corresponds to the junction N2 to the connection point N3 a "second path", which is a power supply path to the electrical load, and the connection point N4 corresponds to a second connection point. In addition, the switch corresponds 23 a "third switch", and the switch 24 corresponds to a "fourth switch", the switch 23 and 24 are however interchangeable.

The switches 21 to 24 include one or more pairs of semiconductor switches 21a to 21d . 22a to 22d . 23a . 24a and 24b , The semiconductor switches 21a to 21d . 22a to 22d . 23a . 24a and 24b are each a MOSFET, and are connected in series, so that parasitic diodes of the MOSFET pair face each other.

As an example, the switch is below 21 described. In the switch 21 are the semiconductor switches 21a and 21b connected in series, and the semiconductor switches 21b and 21d are connected in series. These two semiconductor switch pairs are connected in parallel. Specifically, the series-connected semiconductor switches 21a and 21b parallel to the series-connected semiconductor switches 21c and 21d connected. Because of their internal structures, the semiconductor switches include 21a to 21d necessarily a rectifier. Specifically, an internal circuit of the semiconductor switch 21a a circuit in which a switch section is connected in parallel to the parasitic diode. Similarly, an internal circuit of the semiconductor switch 21b also a circuit in which a switch section is connected in parallel to the parasitic diode. The semiconductor switches 21a and 21b are connected in series so that the parasitic diodes face each other. The same applies to the semiconductor switches 21c and 21d ,

Conveniently, the switch 21 has been described, however, the switch has 22 a similar configuration. The switches 23 and 24 Also have a similar configuration, except that the number of semiconductor switches (that is, the number of pairs) is different. In 1 For example, the anodes of the parasitic diodes are connected together, but the cathodes of the parasitic diodes may be connected together.

With the configuration of the switches described above 21 to 24 will if the switch 21 is turned off, that is, when the semiconductor switch 21a to 21d are switched off, a current flowing through the parasitic diodes electric current completely interrupted.

Instead of a MOSFET, the semiconductor switches may be IGBTs, bipolar transistors or the like. When the switch sections use IGBTs or bipolar transistors, a diode that is a replacement for the parasitic diode can be connected in parallel with each of the switch sections. The switches 21 to 24 each may include a plurality of MOSFET pairs, and the plurality of MOSFET pairs may be connected in parallel.

The rotating electric machine 14 is with the electrical paths L1 and L2 connected while the electrical load 15 (load requiring constant voltage) with the electrical paths L3 and L4 connected is. A large current flows through the rotating electrical machine 14 compared with the electrical load 15 , Thus, a permissible current of the electric paths L1 and L2 provided switch 21 and 22 greater than a permissible current on the electrical paths L3 and L4 provided switch 23 and 24 set. Specifically, in the counters 21 and 22 the plurality of semiconductor switch pairs connected in parallel, so that the allowable current of the switch 21 and 22 greater than the allowable current of the switches 23 and 24 is. Thus it can be said that the electrical paths L1 and L2 There are paths for a large current, on which a permissible current compared to the electrical paths L3 and L4 is great.

Furthermore, the storage battery unit U includes bypass paths B1 and B2 that make it possible for the lead storage battery 11 with the rotating electric machine 14 and the electrical load 15 by bypassing the switch 21 and 23 are connected in the unit. Specifically, the bypass paths B1 and B2 provided to the switches 21 and 23 on the electrical paths L1 and L3 to get around.

Inside the unit is one end of the bypass path B1 with the connection point N2 on the electrical path L1 connected, and the other end of the bypass path B1 I am the liaison office N1 on the electrical path L1 connected. The bypass path B1 is with a switch bypass circuit RE1 equipped, the bypass path B1 caused to be in an energized state or in no energized state. For example, the switch bypass circuit includes RE1 a normally closed mechanical relay. When the switch bypass circuit RE1 the bypass path B1 caused to be in an energized state, even in a situation where the switch 21 is off, the lead storage battery 11 through the bypass path B1 with generated electrical energy from the rotating electric machine 14 be supplied.

Inside the unit is one end of the bypass path B2 with the connection point N2 on the electrical path L2 connected, and the other end of the bypass path B2 is with a location between the junction N4 on the electrical path L3 and the external connection P2 connected. The bypass path B2 is with a switch bypass circuit RE2 equipped, the bypass path B2 caused to be in an energized state or in no energized state. For example, the switch bypass circuit includes RE2 a normally closed mechanical relay. When the switch bypass circuit RE2 the bypass path B2 caused to be in an energized state, even in a situation where the switch 23 is off, the electrical load can be 15 through the bypass path B2 with electrical energy from the lead storage battery 11 be supplied.

The storage battery unit U includes a voltage detector 31 that has a voltage of the external terminal P1 detected. The storage battery unit U may include a current detector and an electric current of the external terminal P1 determine.

In addition, the external connection P0 with the lead storage battery 11 about a fuse 35 connected. The external connection P2 is with the electrical load 15 about a fuse 38 connected. The connection point N2 is with the switch bypass circuit RE1 about a fuse 37 connected.

The storage battery unit U includes a control section 51 as a switch control device comprising the switches 21 to 24 and the switch bypass circuits RE1 and RE2 controls. The control section 51 consists of a microcomputer with a CPU, a ROM, a RAM, a capture output interface and the like.

The control section 51 controls the switches 21 to 24 and the like, for example, based on an energy storage state of the storage batteries 11 and 12 , For example, the control section performs 51 the controller in a state where the vehicle-mounted power supply system is stopped (that is, an ignition switch-off state) is such that the switch bypass circuits RE1 and RE2 are closed and the switches 21 to 24 are open. In the following description, the state in which the vehicle-mounted power supply system is stopped is referred to as an IG off state. Further, a state in which the vehicle-mounted power supply system is operated (that is, a turned-on state of the ignition switch) is referred to as an IG on state.

On the other side leads the control section 51 in the IG on state, the control is such that the switch bypass circuits RE1 and RE2 are open and the switches 21 to 24 are opened or closed accordingly. At this time, the control section controls 51 the switches 21 to 24 accordingly so that at least one of the switches 23 and 24 closed is. Thus, the control section controls 51 the switches 21 to 24 according to the switches 21 to 24 so that the electrical load 15 is continuously supplied with electrical energy.

Specifically, the control section calculates 51 a state of charge (English: SOC) of the lithium-ion storage battery 12 , By such control of the switch 21 to 24 so that the SOC is kept within a predetermined range, the control section controls 51 then the charging and discharging of the lead storage battery 11 and the lithium ion storage battery 12 , In particular, the control section loads and unloads 51 the lead storage battery 11 and the lithium-ion storage battery 12 selectively.

In addition, the control section performs 51 a determination of an abnormality with respect to the storage battery unit U out. Examples of an irregularity with respect to the storage battery unit U are abnormalities in charging and discharging of the lithium-ion storage battery 12 and irregularities regarding the switches 21 to 24 ,

For example, the control section detects 51 with the help of a current sensor or a temperature sensor, that over-supply current through the lithium ion storage battery 12 flows or that is a temperature of the lithium-ion storage battery 12 has risen excessively. When the control section 51 determines that such an irregularity has occurred, the control section 51 a failover operation. Thus, the control section functions 51 also as an abnormality determination section that determines that an abnormality (disturbance) has occurred in the vehicle-mounted power supply system.

When the control section 51 determines that an abnormality has occurred, leads the control section 51 the failover operation. When the failover operation is performed, the control section closes 51 all switches 21 to 24 and opens the switches 22 and 24 so that the electrical paths L2 and L4 not in an energized state. Subsequently, the control section closes 51 the switch bypass circuits RE1 and RE2 , and opens all the switches 21 to 24 , In this state, the control section leads 51 various operations in the failover operation. Specifically, the control section leads 51 the controller so that the electrical loads 13 and 15 with electrical energy from the lead storage battery 11 be supplied.

An ECU consisting of an engine ECU or the like 52 is with the control section 51 connected. The ECU 52 consists of a microcomputer with a CPU, a ROM, a RAM, an input-output interface and the like. The ECU 52 controls the operation of the engine each time based on an operating condition of the engine and a driving condition of the vehicle. The control section 51 is with the ECU 52 through a communication network such as a CAN, so that the control section 51 and the ECU 52 can communicate with each other and the control section 51 and the ECU 52 various in the control section 51 and the ECU 52 can share stored data with each other. The detection of an abnormality (disturbance) of the vehicle-mounted power supply system may be detected by the ECU 52 be executed, and the ECU 52 can the control section 51 notify about the irregularity (fault). When the control section 51 from the ECU 52 the irregularity is notified, the control section leads 51 various operations in the failover operation.

The following is a state of a storage battery unit U described in the IG on state. As in 2 For example, the IG on state includes a state in which the switches 21 and 23 closed, the switches 22 and 24 open, and the switch bypass circuits RE1 and RE2 are open.

When electrical energy from the rotating electric machine 14 is generated in such a state becomes the lead storage battery 11 supplied with the generated electrical energy, and the electrical load 15 is supplied with the generated electrical energy. Even if no electrical energy is generated, the electrical load becomes 15 with electrical energy from the lead storage battery 11 provided.

In addition, like one 2 B) For example, the IG on state includes a state in which the switches 22 and 24 closed, the switches 21 and 23 are open, and the switch bypass circuits RE1 and RE2 are open.

When in such state electrical energy from the rotating electric machine 14 is generated, the lithium-ion storage battery 12 supplied with the generated electrical energy, and the electrical load 15 is supplied with the generated electrical energy. Even if no electrical energy is generated, the electrical load becomes 15 with electrical energy from the lithium-ion storage battery 12 provided.

In the IG on state, the switches become 21 to 24 controlled so that at least one of the switches 23 and 24 turned on (closed). Thus, the electrical load 15 at least one of the lead storage battery 11 and the lithium ion storage battery 12 be supplied with electrical energy.

Next, a state of the storage battery unit U in a fail-safe state will be described. As in 2 (c) shown are the switches 21 to 24 in the fail-safe state, and the switch bypass circuits RE1 and RE2 closed. When in such state electrical energy from the rotating electric machine 14 State is generated, the lead storage battery 11 supplied with the generated electrical energy, and the electrical load 15 is supplied with the generated electrical energy. Even if no electrical energy is generated, the electrical load becomes 15 with electrical energy from the lead storage battery 11 provided.

The electrical load 15 includes a constant-voltage load. When the storage battery from which the electrical load 15 is supplied with electrical energy between the lead storage battery 11 and the lithium ion storage battery 12 is switched, a power failure must be prevented. Especially when changing the states open / closed between the switch 23 and the switch 24 A power failure must be prevented by temporarily power failure from the two storage batteries 11 and 12 fed and then one of the switches 23 and 24 is opened.

If, however, electrical energy temporarily from both storage batteries 11 and 12 Depending on the situation, an excessive current that exceeds the allowable amount of the switch may be supplied 23 and 24 passes through the switch 23 and through the switch 24 flow.

As in 1 shown are the lead-storage battery 11 and the lithium-ion storage battery 12 through the respective electrical paths L1 and L2 with the rotating electric machine 14 connected. If one of the electrical paths L1 and L2 is in an energized state, so that an exciting current (power generation current) from the rotating electric machine 14 through one of the electrical paths L1 and L2 can flow, that of the rotating electrical machine 14 flowing electric current into the electrical paths L3 and L4 flow.

In particular, during an exciting current (power generation current) from the rotary electric machine 14 through the electrical path L2 into the lithium-ion storage battery 12 flows (for example, a state in 3 (a) ), all switches will be the first 21 to 24 closed (on) (state in 3 (b) ) when the failover operation is performed. Subsequently, the switches must 22 and 24 can be opened, but due to variations in the drive speed of the semiconductor switch, the switch 22 earlier than the other switches 21 . 23 and 24 be opened (off) (state in 3 (c) ).

In this case, the electrical paths L1 . L3 and L4 in an energized state and the electrical path L2 is not in an energized state. In this state, the electric current flows from the rotary electric machine 14 through the electrical paths L1 . L3 and L4 into the lithium-ion storage battery 12 , Thus, a load of the lithium-ion storage battery 12 less than a load of electrical load 15 , If accordingly the electrical paths L3 and L4 are in an energized state, also flows through the electrical path L1 flowing power generation current (large current) in the lithium-ion storage battery 12 so that the lithium-ion storage battery 12 is loaded.

Especially if a voltage value (load resistance) of the lithium-ion storage battery 12 lower than a voltage of the lead storage battery 11 is a large current more likely to flow into the lithium-ion storage battery 12 , As described above, since the allowable current of the switch 23 and 24 in comparison to that permissible current of the switches 21 and 22 is small, in this case, the electric current can be an overcurrent for the switches 23 and 24 be. The same applies if an electric current from the rotating electrical machine 14 through the electrical path L1 into the lead storage battery 11 flows.

When the rotating electric machine 14 generates electrical energy, fits the rotating electric machine 14 normally a field current such that the field current has a voltage within a predetermined range. Accordingly, if the excitation current through the switch 23 and 24 in the storage batteries 11 and 12 flows, which should not be charged, the rotating electric machine 14 increase the electrical current to maintain the voltage. Thus, an over-supply current is more likely to flow into the switches 23 and 24 , If all switches 21 to 24 are closed (state in 3 (b) ), a large current is unlikely to flow through the electrical paths L3 and L4 due to a difference in the load resistance between the electrical load 15 and the storage batteries 11 and 12 ,

In a situation where an electric current of the rotating electric machine 14 through the electrical paths L1 and L2 flows while one of the switches 23 and 24 is in a closed state when the control section 51 the switch in a closed state between the switches 23 and 24 changes, causes the control section 51 thus, that both the switches 23 and 24 are temporarily in a closed state, and the control section 51 performs the change under the condition that, during the closed state, a predetermined reduction state has occurred, in which an electric current passing through the electrical paths L3 and L4 flows, has been reduced. In the present embodiment, when the control section 51 the open / closed states between the switches 21 and 22 exchanges and the open / closed states between the switches 23 and 24 changes, determines the control section 51 in that the predetermined reduction state has occurred, provided that the switches 21 and 22 be kept in a closed state before any of the switches 23 and 24 is opened.

In particular, after the control section 51 has caused the electrical paths L1 and L2 between the lead storage battery 11 and the lithium ion storage battery 12 are in an energized state while the energized state is maintained, the control section operates 51 in that the on / off states of the switches 23 and 24 in the electrical paths L3 and L4 be switched together. Regarding 4 Hereinafter, an opening and closing operation in the fail-safe operation will be described. The opening and closing operation is performed by the control section 51 executed in a given cycle.

The control section 51 determines whether an abnormality with respect to the storage battery unit U occurred (step S101 ). Thus, the control section determines 51 whether the failover operation needs to be performed. If no irregularity has occurred (NO at step S101 ), the control section ends 51 the opening and closing process.

When it is determined that an abnormality has occurred (YES at step S101 ), the control section closes 51 the switches 21 and 22 (Step S102 ) and opens the switches 23 and 24 (Step S103 ). At this time, the switches 21 to 24 preferably closed at the same time. When the switches 23 and 24 earlier than the switches 21 and 22 can be closed, a through the electrical paths L1 and L2 flowing power generation current in the electrical paths L3 and L4 flow. In particular, if the electrical paths L1 . L3 and L4 are in an energized state, a power generation current from the rotating electrical machine 14 in the electrical paths L3 and L4 flow. Thus, the control section 51 the switches 21 and 22 Close and then the switches 23 and 24 shut down.

The control section 51 opens the switch 24 (Step S104 ). In particular, after the control section 51 has caused the electrical paths L1 and L2 are in an energized state, the control section causes 51 the on / off states of the switches 23 and 24 to change with each other. When a given time has passed after the switch 24 has been opened (step S105 ), the control section opens 51 the switch 22 (Step S106 ). In particular, after the change of the open / closed states between the switches 23 and 24 , opens the control section 51 the switch 22 , Subsequently, the control section closes 51 the switch bypass circuits RE1 and RE2 , and performs various operations in the failover operation.

Subsequently, referring to 5 the times for switching the switches 21 to 24 described.

5 shows a case in which it is determined while the lithium-ion storage battery 12 With electric current from the rotating electric machine 14 is supplied and the electrical load 15 with electrical energy from the lithium-ion storage battery 12 is supplied, that an abnormality has occurred and the fail-safe operation is performed.

If it is determined that an irregularity has occurred (time t1 ), the control section closes 51 the switches 21 to 24 , After the switches 21 to 24 are closed, opens the control section 51 the switch 24 while the switches 21 . 22 and 23 remain closed (time t2 ). When a given time has passed after the switch 24 has been opened, opens the control section 51 the switch 22 (Time t3 ). This reduces one in the electrical paths L3 and L4 flowing electric current of the rotating electric machine 14 , This will prevent an excessive current above the allowable current of the switches 23 and 24 through the switches 23 and 24 flows. Furthermore, since at least one of the switches 23 and 24 is closed, the electrical power supply to the electrical load 15 maintained.

The embodiment described above achieves the following advantageous effects.

In the storage battery unit U flows through the electrical paths L1 and L2 between the rotating electrical machine and each of the lead storage batteries 11 and the lithium ion storage battery 12 an excitation current. In addition, the electrical load 15 through the electrical paths L3 and L4 with electrical energy from one of the lead storage battery 11 and the lithium ion storage battery 12 provided. Whether the excitation current between the lead-storage battery 11 and the rotating electric machine 14 or between the lithium ion storage battery 12 and the rotating electric machine 14 flows, is controlled by the switches 21 and 22 be opened or closed. Furthermore, by opening or closing the switch 23 and 24 controlled, whether the electrical load 15 with electrical energy from the lead storage battery 11 or from the lithium-ion storage battery 12 is supplied.

In a situation where a field current of the rotary electric machine 14 through the electrical paths L1 and L2 flows while one of the switches 23 and 24 is in a closed state, in a case where the switch is in a closed state between the switches 23 and 24 is changed and both the switches 23 As well as 24 are temporarily in a closed state, it can cause interference when the excitation current (large current) of the rotating electric machine 14 passing through the electrical paths L1 and L2 flows, in the electrical paths L3 and L4 flows and an excessive current through the switches 23 and 24 flows. In this connection, in the configuration of the above-described embodiment, the change of the switch is in a closed state between the switches 23 and 24 provided that the predetermined reduction state has occurred, in which an electrical energy passing through the electrical paths L3 and L4 flows, has been reduced. In this case, the disturbance can be due to a high current flow in the electrical paths L3 and L4 be avoided. This makes it possible to prevent an excessive current for the allowable current of the switches from flowing through the switches.

When the fail-safe operation is performed while the electric load 15 with electrical energy from the lithium-ion storage battery 12 is supplied, and the lithium-ion storage battery 12 with electrical energy from the rotating electrical machine 14 is supplied, the change in the electrical path between the lithium-ion storage battery 12 and the lead storage battery 11 executed. In particular, in a situation where an exciting current of the rotary electric machine 14 through the electrical paths L1 and L2 flows, the closed switch between the switches 21 and 22 , and the closed switch between the switches 23 and 24 changed. In this case, the switches perform 22 and 24 both a transition from a closed to an open state. If at this time the switch 22 earlier than the switch 24 is opened, the electric path L2 between the rotating electrical machine 14 and the lithium ion storage battery 12 interrupted. This can cause a large current through the electrical paths L3 and L4 in the switch 24 flows. For example, if the commands, the switches 22 and 24 can be issued at the same time, this situation may be due to a different operating delay, or the like, the switch 22 and 24 occur.

If, in the above embodiment, the change between the switches 21 and 22 and the switch between the switches 23 and 24 is executed, it is determined in this regard that the predetermined Reduzierungszustand has occurred, under the condition that the switches 21 and 22 are kept in a closed state before the switch 24 is opened, and then the switch between the switches 23 and 24 executed. When the closed switch between the switches 23 and 24 can thus be changed by a large, by the electrical paths L3 and L4 flowing current caused disturbance.

Second Embodiment

In a case of a second embodiment in which the control section 51 the open / closed states of the switches 23 and 24 in a situation where an electric current of the rotary electric machine changes 14 through the electrical paths L1 and L2 flows, determines the control section 51 in that the predetermined reduction state has occurred on the condition that the change has been requested and subsequently the electric current of the rotary electric machine 14 has been reduced, and then the control section performs 51 the change. By thus reducing the drive of the rotary electric machine 14 so that the exciting current itself is reduced, for example, by the electrical paths L3 and L4 flowing power generation current is reduced. This is described in more detail below.

When the control section 51 determines that an abnormality has occurred, the control section notifies 51 the ECU 52 with an irregularity notification that an irregularity has occurred. If the ECU 52 receives the irregularity notification, the ECU performs 52 the control is such that the power generation from the rotating electrical machine 14 is reduced. On the other hand, the control section takes 51 a voltage (or electric current) of the external terminal P1 and when the voltage becomes a predetermined value or less, that is, after the control section 51 confirms that the electric current of the rotating electric machine 14 has been reduced, the control section performs 51 switching the switches 21 to 24 out.

With reference to 6 Hereinafter, an opening and closing operation of the second embodiment will be described. The opening and closing operation is performed by the control section 51 executed in a given cycle.

The control section 51 determines whether an abnormality with respect to the battery unit U occurred (step S201 ). If no irregularity has occurred (NO at step S201 ), the control section ends 51 the opening and closing process. When it is determined that an abnormality has occurred (YES at step S201 ) notifies (issues) the control section 51 the ECU 52 with an irregularity notification (step S202 ).

Subsequently, the control section takes 51 a voltage of the external connection P1 on (step S203 ). Concrete is the control section 51 with the voltage detector 31 connected, and the control section 51 takes the voltage of the external connection P1 from the voltage detector 31 on.

The voltage detector 31 determines if the voltage of the external connection P1 has assumed a predetermined value or less, that is, whether the electric current of the rotary electric machine 14 has been reduced (step S204 ). The predetermined value is a voltage value based on the load resistance of the electric load 15 and the allowable current of the switches 23 and 24 is set. The predetermined value may be, for example, a value at which it can be confirmed that an electric current is not larger than the flowing allowable current. Specifically, it can be determined when the excitation current of the rotary electric machine 14 has been reduced, that the electric current of the rotating electric machine 14 has been reduced.

When the voltage of the external connection P1 does not correspond to the predetermined value or less (NO at step S204 ) after a predetermined period of time has elapsed, the control section performs 51 the process of the step S203 again off. Thus, the control section 51 in standby until the external connection P1 takes the given value or less.

When the voltage of the external connection P1 takes the given value or less (YES at step S204 ), the control section begins 51 switching the switches 21 to 24 , In particular, after the control section 51 the switches 21 to 24 closes (step S205 ), the control section opens 51 the switches 22 and 24 (Step S206 ).

Even if the switches 22 and 24 will be opened at different times at this time, prevents over-supply current through the electrical paths L3 and L4 flows. Especially if the electrical paths L1 . L3 and L4 are in an energized state, and the electrical path L2 in no energized state, since the electric current of the rotating electric machine 14 itself has been reduced, is also the electric Electricity flowing in the electrical paths L3 and L4 flows, reduces. Even if the electrical paths L2 . L3 and L4 are in an energized state and the electrical path L1 in no energized state, since the electric current of the rotating electric machine 14 Even the electric current that is in the electrical paths is also reduced L3 and L4 flows, similarly reduced.

Subsequently, referring to 7 the times for switching the switches 21 to 24 described.

7 shows a case in which, during the supply of the lithium-ion storage battery 12 with electric current from the rotating electric machine 14 and the supply of the electrical load 15 with electrical energy from the lithium-ion storage battery 12 , it is determined that an abnormality has occurred, and the fail-safe operation is performed.

If it is determined that an irregularity has occurred (time t11 ), the control section notifies 51 the ECU 52 with an irregularity notification. If the ECU 52 receives the irregularity notification, the ECU performs 52 the control is such that the power generation from the rotating electrical machine 14 is reduced. Thus, a power generation current from the rotary electric machine 14 reduced and a voltage of the external connection P1 is also reduced. When the voltage of the external connection P1 takes the predetermined value or less, the control section closes 51 the switches 21 to 24 (Time t12 ). After the switches 21 to 24 are closed, opens the control section 51 the switches 22 and 24 (Time t13 ) while the switches 21 and 23 be kept in a closed state. This reduces the electrical current of the rotating electrical machine 14 who is in the electrical paths L3 and L4 flows. This will prevent excessive current through the switches 23 and 24 flows. Furthermore, the electrical power supply to the electrical load 15 maintained, since at least one of the switches 23 and 24 closed is.

The above-described second embodiment achieves the following advantageous effects.

If the ECU 52 receives an abnormality notification, the power generation from the rotary electric machine 14 reduced. When a field current of the rotating electric machine 14 is reduced, an electric current passing through the electrical paths L3 and L4 flows, reduces. In this case, when the closed switch between the switches 23 and 24 Can be changed from a large, through the electrical paths L3 and L4 flowing current caused disturbance.

The control section 51 determined based on the voltage of the external terminal P1 whether the power generation by the rotating electric machine 14 has been reduced, and if the power generation by the rotating electric machine 14 has been reduced, the control section performs 51 the change between the switches 23 and 24 , Thus, that of a great, through the electrical paths L3 and L4 flowing current caused disturbance.

(Third Embodiment)

In a third embodiment, the battery unit U is applied to a vehicle including the rotary electric machine 14 and an engine including an idle stop function for performing an automatic stop of the engine and a restart of the engine by an energetic drive of the rotary electric machine 14 having.

When the engine is restarted, the rotary electric machine efficiently becomes 14 typically with electrical energy from the lithium ion storage battery 12 provided. At this time, a voltage drop of the electrical load 15 To prevent supplied electrical energy, the electrical load 15 preferably with electrical energy from the lead storage battery 11 provided. However, when the fail-safe operation is performed in a case where it is determined between an automatic stop of the engine and a restart of the engine that an abnormality has occurred, the electric load becomes 15 with electrical energy from the lead storage battery 11 provided. In this state, a voltage drop of the electrical load 15 supplied electric power occur if the engine is restarted and the rotating electric machine 14 with electrical energy from the lead storage battery 11 is supplied. Specifically, a large amount of electric power is needed to restart the engine, and thus it is very likely that a voltage drop will occur.

Thus, when it is determined that an abnormality has occurred between an automatic stop of the engine and a restart of the engine, the control section performs 51 the failsafe operation only after a restart of the engine. In particular, after a restart of the engine, the control section closes 51 the switches 21 to 24 , and then opens the control section opens 51 the switches 22 and 24 , Thus, the control section functions 51 as a changing section, which, when the engine is restarted, a storage battery, which is a power source of the rotating electrical machine 14 is changing on the condition that it is determined that an abnormality has occurred. Thus, when the engine is restarted, the voltage drop to the electrical load can 15 be prevented.

If there is an abnormality in the switch between an automatic stop and a restart of the engine 21 which is the first switch (for example OFF fault, that is, the switch 21 remains in an open state) before the engine is restarted, the control section performs 51 the controller so that the switch 23 closed and the switch 24 is open. Accordingly, when the engine is restarted, the rotary electric machine becomes 14 with electrical energy from the lead storage battery 11 supplied, and the electrical load 15 gets electrical energy from the lead storage battery 11 provided. Thus, when the engine is restarted, there may be a voltage drop in the electrical load 15 be prevented.

Furthermore, if an irregularity in the switch 22 which is the second switch (for example OFF fault, that is, the switch 22 remains in an open state) before the engine is restarted, the control section performs 51 the controller so that the switch 23 open and the switch 24 closed is. Accordingly, when the engine is restarted, the rotary electric machine becomes 14 with electrical energy from the lead storage battery 11 supplied, and the electrical load 15 gets electrical energy from the lead storage battery 11 provided. Thus, when the engine is restarted, there may be a voltage drop in the electrical load 15 be prevented.

(Fourth Embodiment)

In a fourth embodiment, the battery unit U applied to a vehicle, which is the rotating electric machine 14 and an engine including an idle stop function for performing an automatic stop of the engine and a restart of the engine by an energetic drive of the rotary electric machine 14 having. In short, when a predetermined automatic stop condition is satisfied in the idle stop function, the engine is stopped, and subsequently, when a predetermined restart condition is satisfied, the engine is restarted.

In this case, the automatic stop condition includes, for example, a situation in which a vehicle speed of the own vehicle is in an engine automatic stop speed range (for example, a speed ≤ 10 km / h), and an acceleration operation is enabled or Braking operation is performed. In the fourth embodiment, the automatic stop condition includes a situation in which the storage battery is in a predetermined state suitable for an idling stop state (a state in which the engine automatically stops), for example, a situation in which an SOC of the lithium-ion storage battery 12 corresponds to a predetermined threshold or more. Further, the automatic stop condition includes, for example, a situation in which acceleration operation is started and a situation in which the braking operation is released.

When transitioning to an idle stop state based on the idle stop function, switching the switches must 21 to 24 be executed. Specifically, after the engine is started (or restarted) as in 2 B) shown are in the battery pack U the switches 21 and 23 in an open state while the switches 22 and 24 in a closed state, so the lithium-ion storage battery 12 with the rotating electric machine 14 and the electrical load 15 connected is. Thus, the electric load becomes 15 with the electrical energy from the lithium-ion storage battery 12 supplied, and the lithium-ion storage battery 12 is supplied with the generated electrical energy (charged).

If the SOC of the lithium-ion storage battery 12 a predetermined threshold or more, the control section closes 51 the battery unit U the switch 23 and opens the switch 24 , Thus, the electric power supply of the lithium-ion storage battery 12 to the electrical load 15 stopped while the electrical power supply from the lead storage battery 11 to the electrical load 15 is started. Furthermore, the control section notifies 51 the ECU 52 that the SOC of the lithium ion storage battery 12 the threshold or more. Thus, the ECU prepares 52 for a transition to the idling stop state. At this time, as in 2 (a) shown is the switch 21 closed, so the lead storage battery 11 with a power generation voltage of the rotary electric machine 14 is supplied. Thus, the lead storage battery becomes 11 charged and the electrical load 15 is continuously using electrical energy from the lead storage battery 11 provided.

If the ECU 52 has been notified that the SOC of the lithium ion storage battery 12 the threshold or more, and the ECU 52 For example, it is notified that a vehicle speed of the own vehicle is in the engine-automatic stop speed range and an acceleration process has been released, determines the ECU 52 in that an automatic stop condition is fulfilled.

If the ECU 52 determines that the automatic stop condition is satisfied. notifies the ECU 52 the control section 51 in that the automatic stop condition is fulfilled. When the control section 51 the notification is received that the automatic stop condition is met, the control section opens 51 the switches 23 and 24 , In particular, the control section performs 51 the change between the switches 23 and 24 so that the electrical load 15 with electrical energy from the lithium-ion storage battery 12 is supplied. Thus, the ECU works 52 of the present embodiment as a display device including the control section 51 about a time for switching a switch to a closed state between the switches 23 and 24 instructs.

When the change between the switches ends, the control section notifies 51 the ECU 52 in that the transition preparation for a transition to the idling stop state has been completed. After the automatic stop condition is met, the ECU performs 52 various types of control so that a transition is made to the idle stop state when the ECU 52 from the control section 51 the notification receives that transition preparation has been completed. The ECU 52 For example, gives instructions to stop the engine. Thus, in the idling stop state, the electric load 15 with electrical energy from the lithium-ion storage battery 12 be supplied. Because the SOC of the lithium ion storage battery 12 the threshold or more, when the transition to the idling stop state is started, the electric load 15 be continuously supplied with electrical energy.

Even if the automatic stop condition is met, the vehicle can be decelerated, and thus the rotating electric machine can 14 electrical energy at a voltage higher than a predetermined value can be generated. If the exchange between the switches 23 and 24 is performed only after the power generation voltage is reduced, the vehicle is in the idling stop state for a shorter period of time, and thus the fuel efficiency is deteriorated.

When the automatic stop condition is satisfied (that is, a condition for transition to the idling stop state is satisfied), an in 8th shown switching operation to the change between the switches 23 and 24 fast to execute. The change process is performed by the control section 51 executed in a given cycle.

With reference to 8th the change process is described in more detail below. The control section 51 determines whether the automatic stop condition is satisfied (step S401 ). At step S401 the control section performs 51 a confirmation determination when the control section 51 from the ECU 52 a notification is received that the automatic stop condition is fulfilled. If it is not determined that the automatic stop condition is satisfied (NO in step S401 ), the control section ends 51 the change process.

When it is determined that the automatic stop condition is satisfied (YES in step S401 ), the control section closes 51 the switches 21 and 22 (Step S402 ) and close the switches 23 and 24 (Step S403 ). At this time, the switches 23 and 24 preferably closed at the same time. The control section 51 can the switches 21 and 22 Close and then the switches 23 and 24 shut down.

The control section 51 opens the switch 23 (Step S404 ). In particular, after the control section 51 causes the electrical paths L1 and L2 are in an energized state, the on / off states of the switches 23 and 24 switched to each other. When a given time has elapsed after the switch 23 has been opened (step S405 ), the control section opens 51 one of the switches 21 and 22 (Step S406 ), and ends the change process. Concretely, the control section opens 51 one of the switches 21 and 22 after changing the open / closed states between the switches 23 and 24 , One of the switches 21 and 22 can be simultaneously with the change of open / closed states between the switches 23 and 24 be opened.

At step S406 can be arbitrarily determined which of the switches 21 and 22 to open. For example, the switch to be opened may be determined to maintain the state before the change operation is performed. Alternatively, the openable switch may be in a state such as an SOC of the storage batteries 11 and 12 or a state of the battery unit U to be determined. In addition, both the switches 21 as well as 22 be opened or kept in a closed state.

In addition, at step S406 the desk 22 be opened (the switch 21 can be closed). In this case, when the engine is started, the rotating electric machine can 14 with electrical energy from the lead storage battery 11 be supplied. Thus, in a case where the engine is driven by the driving force of the rotary electric machine 14 It restarts, even if the rotating electrical machine 14 with electrical energy from the lead storage battery 11 their influence on the electrical energy supply of the electrical load 15 be prevented. In particular, it is possible for a voltage drop of the lithium-ion storage battery 12 on the electrical load 15 to prevent.

After the end of the change process, the control section notifies 51 the ECU 52 in that the transition preparation for a transition to the idling stop state has been completed. After the automatic stop condition is met, the ECU performs 52 various types of control so that a transition is made to the idle stop state when the ECU 52 from the control section 51 the notification receives that the transitional preparation has been completed.

With reference to 9 Below are the times for switching between the switches 21 to 24 described. 9 shows a case where the switches 21 and 23 in an initial state (before the switching operation is performed) are closed, and the switches 22 and 24 are open. In particular shows 9 a case where while the electrical load 15 with electrical energy from the lead storage battery 11 is supplied, the automatic stop condition is satisfied and a transition is made to the idling stop state.

In addition, the case continues in 9 advance that switching the switch 21 to 24 is executed, so in the end the switches 21 and 24 are closed and the switches 22 and 23 are open. In particular, the case continues in 9 advance that the electrical load 15 in the idling stop state with electric power from the lithium-ion storage battery 12 is supplied.

When the automatic stop condition is fulfilled (time T41 ), the control section closes 51 the switches 21 to 24 , After closing the switch 21 to 24 and while the switches 21 . 22 and 24 remain closed, opens the control section 51 the switch 23 (Time T42 ). If a predetermined period of time after opening the switch 23 has elapsed, the control section opens 51 the switch 22 (Time T43 ). This reduces one in the electrical paths L3 and L4 flowing electric current of the rotating electric machine 14 , and thus prevents excessive current for the allowable current through the switches 23 and 24 flows. Furthermore, the electrical power supply to the electrical load 15 maintained, since at least one of the switches 23 and 24 closed is.

The embodiment described above achieves the following advantageous effects.

While the electrical load 15 with electrical energy from the lead storage battery 11 during power generation by the rotating electric machine 14 can be switched, switching between the switches 23 and 24 be executed so that the electrical load 15 with electrical energy from the lithium-ion storage battery 12 is supplied when the automatic stop condition is satisfied and a transition is made to the idle stop state. In particular, in a situation in which a field current of the rotating electrical machine 14 through the electrical paths L1 and L2 flows, the closed switch between the switches 23 and 24 be switched. If at this time both switches 23 and 24 are closed and one of the electrical paths L1 and L2 is interrupted, a large current in the switch 23 and 24 through the electrical paths L3 and L4 flow.

In the above embodiment, in this regard, the change between the switches 23 and 24 is executed, it is determined that the predetermined reduction state has occurred under the condition that the switches 21 to 24 are closed, and then the switch between the switches 23 and 24 executed. So if the closed switch between the switches 23 and 24 can be switched by one in the electrical paths L3 and L4 flowing large current caused disruption.

If further the switches 21 to 24 are closed, the switches are 21 and 22 closed, and then the switches 23 and 24 closed. Specifically, after or at the same time as closing the switch 21 and 22 the switches 23 and 24 closed. This allows avoiding a situation where both switches 23 and 24 are closed and one of the electrical paths L1 and L2 is interrupted.

In addition, after the switches 21 to 24 are closed, one of the switches 23 and 24 opened and subsequently one of the switches 21 and 22 open. Become concrete, after or at the same time as opening the switch 23 and 24 , one of the switches 21 and 22 open. This allows avoiding a situation where both switches 23 and 24 are closed and one of the electrical paths L1 and L2 is interrupted.

Even if, further, a power generation voltage of the rotary electric machine 14 is greater than a predetermined value, the closed switch between the switches 23 and 24 change. Specifically, there is no need to reduce the power generation voltage of the rotary electric machine 14 Wait, and after the automatic stop condition is satisfied, a transition to the idling stop state can be made quickly. Thus, the fuel consumption can be improved.

Even if, in addition, the switch between the switches 23 and 24 Running the lead storage battery 11 and the lithium-ion storage battery 12 continuously with power generation current from the rotating electric machine 14 be supplied. Thus, the fuel consumption can be improved.

(Fifth Embodiment)

Similar to the fourth embodiment, the battery unit U is applied to a vehicle having an idling stop function. In the fifth embodiment, the objects of the lithium-ion storage battery 12 and the lead storage battery 11 reversed. In the fifth embodiment, the automatic-stop condition includes, in particular, a situation in which the SOC of the lead-storage battery 11 corresponds to a predetermined threshold or more.

After the start (or restart) of the engine in the fifth embodiment, the switches 22 and 24 , as in 2 (a) shown in the battery unit U open while the switches 21 and 23 are closed, so the lead storage battery 11 with the rotating electric machine 14 and the electrical load 15 connected is. Thus, the electric load becomes 15 with electrical energy from the lead storage battery 11 supplied and the lead storage battery 11 is supplied with generated electrical energy (charged).

If the SOC of the lead storage battery 11 the predetermined value or more, the control section closes 51 the battery unit U the switch 24 and opens the switch 23 , Thus, the electric power supply from the lead storage battery 11 to the electrical load 15 stopped while the electrical power supply from the lithium-ion storage battery 12 to the electrical load 15 is started. In addition, the control section notifies 51 the ECU 52 that the SOC of the lead storage battery 11 the threshold or more. Thus, the ECU prepares 52 the transition to the idle stop state before. At this time is the switch 22 closed so that the lithium-ion storage battery 12 with a power generation voltage of the rotary electric machine 14 is supplied.

If the ECU 52 has been notified that the SOC of the lead storage battery 11 the predetermined value or more, and the ECU 52 has been notified that a vehicle speed of the own vehicle is in the engine automatic stop speed range and an acceleration operation has been released, the ECU determines 52 in that an automatic stop condition is fulfilled.

If the ECU 52 determines that the automatic stop condition is met, notifies the ECU 52 the control section 51 in that the automatic stop condition is fulfilled. When the control section 51 the notification is received that the automatic stop condition is met, the control section opens 51 the switch 24 and close the switch 23 , In particular, the control section performs 51 the change between the switches 23 and 24 so that the electrical load 15 with electrical energy from the lead storage battery 11 is supplied. Subsequently, the control section notifies 51 the ECU 52 in that the transition preparation for a transition to the idling stop state has been completed.

After the automatic stop condition is met, the ECU performs 52 various types of control so that a transition is made to the idle stop state when the ECU 52 from the control section 51 the notification receives that the transitional preparation has been completed. In the idling stop state, the electric load becomes 15 with electrical energy from the lead storage battery 11 provided.

Even if the automatic stop condition is met, the rotating electric machine can 14 generate electrical energy at a voltage higher than a predetermined value. If the exchange between the switches 23 and 24 is executed only after the power generation voltage is reduced, the vehicle is in the idling stop state for a shorter period of time, and thus the fuel efficiency is deteriorated.

In the fifth embodiment, when the automatic stop condition is satisfied (that is, a condition for transition to the idle stop state is satisfied), an in 10 shown change process to thereby quickly a change between the switches 21 to 24 perform. The change process is performed by the control section 51 executed in a given cycle.

With reference to 10 Below, the change process is described in detail. The control section 51 determines whether the automatic stop condition is satisfied (step S501 ). If it is not determined that the automatic stop condition is satisfied (NO in step S501 ), the control section ends 51 the change process.

When it is determined that the automatic stop condition is satisfied (YES in step S501 ), the control section closes 51 the switches 21 and 22 (Step S502 ), and close the switches 23 and 24 (Step S503 ). At this time, the switches 21 to 24 preferably closed at the same time. The control section 51 can the switches 21 and 22 Close and then the switches 23 and 24 ,

The control section 51 opens the switch 24 (Step S504 ). In particular, after the control section 51 causes the electrical paths L1 and L2 are in an energized state, the on / off states of the switches 23 and 24 switched to each other. When a given time has elapsed after the switch 24 has been opened (step S505 ), the control section opens 51 one of the switches 21 and 22 (Step S506 ), and ends the change process. Concretely, the control section opens 51 one of the switches 21 and 22 after changing the open / closed states between the switches 23 and 24 , One of the switches 21 and 22 can be simultaneously with the change of open / closed states between the switches 23 and 24 be opened.

Similar to the fourth embodiment, at step S506 can be arbitrarily determined which of the switches 21 and 22 to open.

After the end of the change process, the control section notifies 51 the ECU 52 in that the transition preparation for a transition to the idling stop state has been completed. After the automatic stop condition is met, the ECU performs 52 various types of control so that a transition is made to the idle stop state when the ECU 52 from the control section 51 the notification receives that the transitional preparation has been completed.

Subsequently, referring to 11 the change between the switches 21 to 24 described in more detail. 11 FIG. 15 shows a case where, in an initial state (before the switching operation is performed), the switches 22 and 24 are closed, and the switches 21 and 23 are open. In particular shows 11 a case in which, while the lithium-ion storage battery 12 with electrical energy from the rotating electrical machine 14 is supplied, and the electrical load 15 with electrical energy from the lithium-ion storage battery 12 is supplied, the automatic stop condition is satisfied and a transition is made to the idling stop state.

Furthermore, in the case in 11 provided that switching the switch 21 to 24 running so that at the end the switches 22 and 23 are closed and the switches 21 and 24 are open. In particular, the case continues in 11 advance that the electrical load 15 in the idling stop state with electric power from the lead storage battery 11 is supplied.

When the automatic stop condition is fulfilled (time T51 ), the control section closes 51 the switches 21 to 24 , After closing the switch 21 to 24 and while the switches 21 . 22 and 23 remain closed, opens the control section 51 the switch 24 (Time T52 ). If a predetermined period of time after opening the switch 24 has elapsed, the control section opens 51 the switch 21 (Time T53 ). This reduces one in the electrical paths L3 and L4 flowing electric current of the rotating electric machine 14 , and thus prevents excessive current for the allowable current of the switch 23 and 24 through the switches 23 and 24 flows. Furthermore, the electrical power supply to the electrical load 15 maintained, since at least one of the switches 23 and 24 closed is. The present embodiment described in detail above achieves the following advantageous effects as in the fourth embodiment.

Other Embodiments

The present invention is not limited to the above embodiments, and may be applied as described below, for example. In the following embodiments, the same or corresponding parts are denoted by the same reference numerals and the description of the parts designated by the same reference numerals are incorporated by reference.

In the first to third embodiments, when in the power operation function of the rotary electric machine 14 it is a temporary electrical energy requirement advantageous, a voltage drop of the electrical load 15 To avoid adding electric energy from different storage batteries to the electrical load 15 and the rotating electric machine 14 is delivered. However, if the switches 21 to 24 all are closed in the failover process, an electric current can enter the rotating electrical machine 14 flow, which performs an energy-powered drive, resulting in the voltage drop of the electrical load 15 can lead. So if the open / closed states of the switches 23 and 24 can be changed, the electrical energy requirement itself can be reduced by the energy-driven drive the rotating electrical machine 14 is reduced to the voltage drop of the electrical load 15 to prevent.

In particular, when the control section 51 determines that an abnormality has occurred, the control section notifies 51 the ECU 52 in that it has been determined that an irregularity has occurred. If the ECU 52 receives the irregularity notification, the ECU performs 52 the controller so that the power-driven drive from the rotating electrical machine 14 is reduced. Subsequently, the control section takes 51 a voltage (or electric current) of the external terminal P1 and when the voltage becomes a predetermined value or less, that is, after the control section 51 confirms that the power-driven drive of the rotating electric machine 14 has been reduced, the control section performs 51 switching the switches 21 to 24 out.

Even if the switches 22 and 24 may be opened at different times at this time, may cause a voltage drop to the electrical load 15 be prevented because of the electrical machine 14 flowing electric current itself has been reduced.

In the second embodiment, the control section 51 switching the switches 23 and 24 execute when the control section 51 a voltage or an electric current of the external terminal P0 determined and the determined voltage or the detected electric current is within a predetermined range. Thus, switching the switches 23 and 24 be carried out regardless of the situation, even in a situation in which electrical energy from the electrical load intermittently 13 is related.

In the embodiments described above, the lead storage battery 11 provided as the first storage battery and the lithium-ion storage battery 12 is provided as the second storage battery, however, this configuration may be changed. The second storage battery may, unlike the lithium-ion storage battery 12 , a high-density storage battery, for example, a nickel-hydrogen battery. Alternatively, the first storage battery and the second storage battery may be the same storage battery (for example, a lead storage battery, lithium ion storage battery, or the like).

In the first embodiment, the determination that the predetermined reduction state has occurred is made on the condition that the switches 21 and 22 stay closed before one of the switches 23 and 24 is opened. However, the determination that the predetermined reduction state has occurred is made on the condition that the switches 21 and 22 are open. This prevents the electric current from the rotating electrical machine 14 in the electrical paths L3 and L4 flows.

In the second embodiment, the control section determines 51 based on the voltage of the external connection P1 whether the predetermined reduction state has occurred. However, the control section may 51 determine that predetermined reduction state has occurred when a predetermined period of time (for example, 1 second) has elapsed after the abnormality notification.

In the first to third embodiments, the battery unit U is applied to a case where the open / close states of the switches 23 and 24 be changed in the failover process. However, unlike the case where the fail-safe operation is performed, the battery unit U can be used in any situation where the open / close states of the switches 23 and 24 change. In addition, the open / closed states of the switches 21 and 22 not be changed when the open / closed states of the switches 23 and 24 change. For example, if in the failover operation, the switch 21 closed and the switch 22 open, the open / closed states must be the switch 21 and 22 not to be changed. Furthermore, the opening and closing operation is performed to the switch 23 close and the switch 24 to open. However, the opening and closing operation can be performed to the switch 23 to open and the switch 24 close.

The power supply system may also be used for purposes other than those for vehicles.

In the fourth or fifth embodiment, the determination that the predetermined Reduction state occurred, on the condition that the switches 21 and 22 are open. This prevents the electric current from the rotating electrical machine 14 in the electrical paths L3 and L4 flows.

In the fourth or fifth embodiment, the open / closed states of the switches 21 and 22 be changed as required before executing the change process. For example, before executing the change operation, the open / closed states of the switches 21 and 22 be such that the switch 21 is open and the switch 22 closed, and vice versa. In addition, the switches could 21 and 22 both closed or open.

In the fourth or fifth embodiment, the ECU determines 52 Whether the automatic stop condition is satisfied, but the determination may be made by the control section 51 be executed. In particular, the control section 51 be configured such that information about a vehicle speed, an operating state of the accelerator pedal and the brake and the like in the control section 51 be entered and the control section 51 performs the determination based on the information and the open / closed states of the switches.

In the fourth or fifth embodiment, the control section 51 determine in advance whether the switch between the switches 23 and 24 must be executed, and if the change between the switches 23 and 24 is not necessary, the control section 51 do not execute the change process.

In the fourth or fifth embodiment, when the automatic stop condition is satisfied, the steps become S402 to S406 (or the steps S502 to S506 ) in the change process.

Another example is when a termination condition for stopping power generation by the rotary electric machine 14 is satisfied, can the steps S402 to S406 (or the steps S502 to S506 ) are carried out in the change process. For example, termination condition includes stopping the power generation by the rotary electric machine 14 a situation in which the accelerator pedal is operated and a situation in which a vehicle speed becomes constant. This makes it possible for the closed switch between the switches 23 and 24 is changed without waiting until the power generation voltage becomes the predetermined value or less (that is, immediately after the power generation termination condition is met).

In addition, the steps can S402 to S406 be executed in the change process, if an execution condition for charging the lead-storage battery 11 and supplying the electrical load 15 with electrical energy from the lithium-ion storage battery 12 is satisfied while the lead storage battery 11 (or the lithium ion storage battery 12 ) and electrical energy from the lead storage battery 11 the electrical load 15 is supplied. This makes it possible for the switch in the closed state between the switches 23 and 24 to change without waiting until the power generation voltage has reached the predetermined value or less (that is, immediately after execution of the execution condition).

While the lead storage battery 11 (or the lithium ion storage battery 12 ) and the electrical load 15 with electrical energy from the lithium-ion storage battery 12 can be supplied in a similar way the steps S502 to S506 in the changing operation, if an execution condition for charging the lithium-ion storage battery 12 and supplying the electrical load 15 with electrical energy from the lead storage battery 11 is satisfied. This makes it possible for the closed switch between the switches 23 and 24 is changed without waiting until the power generation voltage becomes the predetermined value or less (that is, immediately after the execution condition is satisfied).

The present invention has been described based on the embodiments, but it should be understood that the present invention is not limited to the embodiments or the structures. The present invention includes various modified examples and changes in an equivalent range. Moreover, a category or range of thinking of the present invention includes various combinations or shapes and other combinations or shapes that include only one element, one or more elements, or one or less elements thereof.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 2017002801 A [0001]
• JP 2015093554A [0004]

Claims (10)

A power supply apparatus (U) applied to a power supply system in which a first storage battery (11) and a second storage battery (12) are connected in parallel to a rotary electric machine (14), and the first storage battery and the second storage battery are connected in parallel to the power supply system electrical load (15) are connected, wherein the power supply device includes: a first path (L1, L2) provided between the first storage battery and the second storage battery, through which an exciting current of the rotary electric machine flows; a first switch (21) provided on the first path closer to the first storage battery than a first connection point (N1) to the rotary electric machine; a second switch (22) provided on the first path closer to the second storage battery than the first connection point; a second path (L3, L4) having one end connected to a location closer to the first storage battery than the first switch on the first path and the other end connected to a location closer to is at the second storage battery, as the second switch, and which is an electric power supply path to the electric load; a third switch (23) provided on the second path closer to the first storage battery than a second connection point (N4) to the electrical load; a fourth switch (24) provided on the second path closer to the second storage battery than the second connection point; and a switch control device (51) controlling the switches, wherein in a situation in which the exciting current of the rotary electric machine flows through the first path while the third switch or the fourth switch is in a closed state, when the switch control device switches the switch in one closed state between the third switch and the fourth switch changes, the switch control device causes the third switch and the fourth switch to temporarily switch to a closed state, and performs the change under the condition that is held while the closed state, a predetermined reduction state has occurred, in which an electric current flowing through the second path has been reduced. Energy supply device according to Claim 1 wherein the switch control device, in a situation in which the exciting current of the rotary electric machine flows through the first path, changes the switch in a closed state between the third switch and the fourth switch, so that the switch is in a closed state from the fourth switch in FIG the third switch or the third switch is switched to the fourth switch; and when the switch control device performs the changeover between the third switch and the fourth switch, the switch control device determines that the predetermined reduction state has occurred under the condition that the first switch and the second switch are in one before opening the fourth switch or the third switch closed state, and the switch control device subsequently performs the changeover between the third switch and the fourth switch. Energy supply device according to Claim 2 , further comprising: an abnormality determination section that determines that an abnormality has occurred with respect to the charging and discharging of the second storage battery, wherein: when it is determined that the abnormality has occurred, the fourth switch or the third switch is opened as a fail-safe operation; and when the fail-safe operation is performed in a situation where the exciting current of the rotary electric machine flows through the first path, the switch control device determines that the predetermined reducing state has occurred under the condition that the first switch and the second switch are before the opening of the fourth switch or third switch are in a closed state, and the switch control device subsequently performs the changeover between the third switch and the fourth switch. Energy supply device according to Claim 1 wherein, in a situation in which the exciting current of the rotary electric machine flows through the first path when the switch control device performs the change between the third switch and the fourth switch, the switch control device determines that the predetermined reducing state has occurred under the condition that the change has been requested, and then the excitation current has been reduced and the switch control device subsequently performs the change. Power supply device according to one of Claims 1 to 4 , which is applied to a vehicle including the rotary electric machine and a motor and having an idle-stop function, in which an automatic stopping of the engine and a restart of the engine by power driven drive of the rotary electric machine, further comprising: an abnormality determination section that determines that an abnormality has occurred with respect to the charging and discharging of the second storage battery; and a changing section that, when the engine is restarted by the power-driven drive of the rotary electric machine, changes a storage battery serving as a supply source for the rotary electric machine under the condition that it is determined that an abnormality has occurred. Energy supply device according to Claim 1 wherein, in a situation where the exciting current of the rotary electric machine flows through the first path while at least one of the first switch and the second switch is in a closed state and one of the third switch and the fourth switch is in a closed state when the switch control device switches the switch in a closed state between the third switch and the fourth switch, the switch control device causes the first switch and the second switch to be in a closed state, and then temporarily causes all the switches in a closed state, and the switch control device determines that the predetermined reduction state has occurred under the condition that all the switches are in a closed state, and the switch control device subsequently performs the change, by causing one of the third switches and the fourth switch to be in an open state, and then causing at least one of the first switch and the second switch to be in an open state. Energy supply device according to Claim 6 wherein the switch control device performs the change between the switches when an automatic stop condition, a power generation stop condition or an execution condition is satisfied, the automatic stop condition being a condition for executing an automatic stop of an engine, the power generation stop condition is a condition for stopping the power generation by the rotary electric machine, and the execution condition is a condition for charging the first storage battery and supplying the electric power of the second storage battery with the electric power. Power supply device according to one of Claims 1 to 7 wherein the first path is a large current path in which a permissible current is large compared to the second path. A power supply system comprising: the power supply device according to any one of Claims 1 to 8th ; the first storage battery; the second storage battery; and the rotating electric machine. Energy supply system according to Claim 9 , further comprising: a display device that instructs the switch control device about a time for performing the change.

Images