WO2018016087A1

WO2018016087A1 - Hybrid vehicle power supply apparatus, hybrid vehicle power supply system, and method for controlling hybrid vehicle power supply apparatus

Info

Publication number: WO2018016087A1
Application number: PCT/JP2016/076715
Authority: WO
Inventors: 一由希目黒; 光宏木村
Original assignee: 新電元工業株式会社
Priority date: 2016-07-22
Filing date: 2016-09-09
Publication date: 2018-01-25
Also published as: JPWO2018016087A1; JP6404485B2

Abstract

This hybrid vehicle power supply system is provided with a control unit that is operated by a second battery voltage outputted from a second battery and that controls a motor generator and a load. When driving the motor generator, the control unit drives an internal combustion engine by supplying an AC voltage obtained by converting a DC voltage of a first power supply terminal supplied from a first battery to the motor generator so as to drive the motor generator. On the other hand, when generating electric power with the motor generator, the control unit charges the first battery and the second battery by converting an AC voltage outputted from the motor generator that generates electric power through driving of the internal combustion engine into a DC voltage and supplying the DC voltage to the first power supply terminal.

Description

HYBRID VEHICLE POWER SUPPLY DEVICE, HYBRID VEHICLE POWER SUPPLY SYSTEM, AND HYBRID VEHICLE POWER SUPPLY DEVICE CONTROL METHOD

The present invention relates to a power supply device for a hybrid vehicle, a power supply system for a hybrid vehicle, and a control method of a control method for the power supply device for a hybrid vehicle. *

Conventionally, a vehicle power supply system is known that includes two batteries having different output voltages as a power source (Patent Document 1).

JP 2011-87428 A

Here, some hybrid motorcycles include a lead battery and a lithium ion battery as power sources. For example, a lithium ion battery is used to drive an internal combustion engine with a motor generator drive function, and a lead battery is used for starting an internal combustion engine, for driving loads such as lights, and for driving a control unit (ECU: Engine ： Control Unit). Used for. Thus, two batteries having different voltages have different characteristics and targets for supplying the voltage.

By the way, a connection relationship in which the voltage of a lithium ion battery is stepped down by a down regulator to charge a lead battery is also conceivable.

Therefore, an object of the present invention is to provide an electric power supply system for a hybrid vehicle that can perform control according to the battery state in the connection relation described above with a simple configuration.

A power supply device for a hybrid vehicle according to an embodiment of one aspect of the present invention includes:
A power supply device for a hybrid vehicle,
The positive electrode is connected to the first power supply terminal and the negative electrode is connected to a fixed potential, and charging is performed by the voltage supplied to the first power supply terminal, and charging of the first battery that outputs the first battery voltage is controlled. The positive electrode is connected to the second power supply terminal and the negative electrode is connected to the fixed potential, and the voltage of the first power supply terminal is reduced by a down regulator and charged by the voltage supplied to the second power supply terminal. , Controlling the charging of the second battery that outputs the second battery voltage, and controlling the motor generator having a drive function for driving the internal combustion engine and a power generation function for generating an AC voltage by driving the internal combustion engine And a control unit for controlling a load connected to the second power supply terminal and supplied with the voltage of the second power supply terminal,
The controller is
Operating at the second battery voltage output by the second battery;
When the motor generator is driven, an AC voltage obtained by converting a DC voltage of the first power supply terminal supplied from the first battery is supplied to the motor generator, so that the motor generator is driven to drive the internal combustion engine. Drive the
At the time of power generation of the motor generator, the AC voltage output from the motor generator that generates power by driving the internal combustion engine is converted into a DC voltage and supplied to the first power supply terminal, whereby the first battery and Charging the second battery;
Obtaining the battery information from a management unit that outputs battery information relating to the state of the first battery;
Depending on the result of determining the state of the first battery based on the battery information, the drive function of the motor generator is stopped, or the power generation function of the motor generator is stopped to stop the first battery. And charging of the second battery is stopped.

In the hybrid vehicle power supply device,
The first battery voltage of the second battery is lower than the first battery voltage of the first battery.

In the hybrid vehicle power supply device,
The controller is
The voltage of the second power supply terminal is monitored, and if the voltage of the second power supply terminal becomes lower than a load threshold value lower than a load voltage value necessary for driving the load, the down It is judged that the regulator or the second battery has failed.

In the hybrid vehicle power supply device,
The controller is
The control of the load is stopped when the voltage of the second power supply terminal becomes less than the load threshold.

In the hybrid vehicle power supply device,
The vehicle power supply device includes:
Mounted on a hybrid motorcycle, the motor generator is connected to an internal combustion engine of the hybrid motorcycle, and the control unit starts the internal combustion engine by driving the motor generator and / or drives the internal combustion engine It is characterized by.

In the hybrid vehicle power supply device,
The load includes at least one of a light, a blinker, an ignition coil, a fail pump, and an injector of the hybrid motorcycle.

In the hybrid vehicle power supply device,
The load is connected between the second power supply terminal and the load, and when turned on, the voltage of the second power supply terminal is supplied to the load, and when turned off, the load of the voltage of the second power supply terminal is supplied. A main switch that is turned off and on by a user operation,
A first relay having one end connected to the positive electrode of the second battery and controlled to be turned on / off by the control unit;
A diode having an anode connected to the other end of the first relay and a cathode connected to the first power supply terminal;
Connected between the output of the down regulator and the second power supply terminal, the step-down voltage output from the down regulator is supplied to the second power supply terminal when turned on, and the down regulator is turned off when turned off. A second relay that shuts off the supply of the stepped-down voltage output to the second power supply terminal, turns on when the main switch is turned on, and turns off when the main switch is turned off,
The controller is
If it is determined that the state of the first battery is normal based on the battery information, the first relay is maintained off;
Determining that an abnormality has occurred in the state of the first battery based on the battery information, and turning on the first relay when the first battery voltage is not output from the first battery; It is characterized by.

In the hybrid vehicle power supply device,
A display unit for displaying predetermined information to the user;
The controller is
When the voltage of the second power supply terminal is less than the load threshold, information indicating that the down regulator or the second battery is out of order is output to the display unit. .

In the hybrid vehicle power supply device,
The controller is
Based on the battery information, when it is determined that the cell voltage of the first battery is equal to or higher than a full charge threshold value that defines full charge, the power generation function of the motor generator is stopped, and the first When it is determined that the discharge voltage of the battery is equal to or lower than a preset cell abnormal voltage threshold lower than the full charge threshold, the drive function of the motor generator is stopped.

In the hybrid vehicle power supply device,
The controller is
If it is determined based on the battery information that the SOC of the first battery is greater than or equal to a preset SOC regulation threshold, the power generation function of the motor generator is stopped, while the first battery When it is determined that the SOC is equal to or lower than a preset SOC abnormality threshold lower than the SOC regulation threshold, the drive function of the motor generator is stopped.

In the hybrid vehicle power supply device,
The controller is
Based on the battery information, when it is determined that the temperature of the first battery is equal to or higher than a preset high temperature abnormality threshold, and the temperature of the first battery is preset lower than the high temperature abnormality threshold. When it is determined that the temperature is less than the low temperature abnormality threshold, the power generation function of the motor generator is stopped, or the drive function of the motor generator is stopped.

In the hybrid vehicle power supply device,
The controller is
Based on the battery information, when it is determined that the charging current flowing through the first battery is equal to or higher than a preset excessive charging current threshold, the power generation function of the motor generator is stopped, while the first When it is determined that the discharge current flowing through one battery is greater than or equal to a preset excessive discharge current threshold, the drive function of the motor generator is stopped.

In the hybrid vehicle power supply device,
The control unit includes an H-bridge circuit configured by a transistor that is driven by supplying a motor current to the motor generator,
When stopping the driving function of the motor generator, all the transistors of the H-bridge circuit are opened, or the high-side or low-side transistors are short-circuited.

In the hybrid vehicle power supply device,
The first battery is a lithium ion battery;
The second battery is a lead battery.

An electric power supply system for a hybrid vehicle according to an embodiment of one aspect of the present invention includes:
A motor generator connected to an internal combustion engine, and having a drive function for driving the internal combustion engine and a power generation function for generating an alternating voltage by driving the internal combustion engine;
A first battery having a positive electrode connected to a first power supply terminal, a negative electrode connected to a fixed potential, charged by a voltage supplied to the first power supply terminal, and outputting a first battery voltage;
A management unit that outputs battery information relating to a state of the first battery;
A down regulator for stepping down the voltage of the first power supply terminal and outputting it to the second power supply terminal;
A second battery that has a positive electrode connected to the second power supply terminal, a negative electrode connected to the fixed potential, is charged by a voltage supplied to the second power supply terminal, and outputs a second battery voltage;
A load connected to the second power supply terminal and supplied with the voltage of the second power supply terminal;
The first power supply terminal that is operated by the second battery voltage output from the second battery, controls the motor generator and the load, and is supplied from the first battery when the motor generator is driven. By supplying an alternating voltage obtained by converting the direct current voltage to the motor generator, the motor generator is driven to drive the internal combustion engine. On the other hand, when the motor generator generates electric power, the internal combustion engine is driven to generate electric power. A controller that converts the AC voltage output by the motor generator into a DC voltage and supplies the first power supply terminal to charge the first battery and the second battery;
The controller is
Obtaining the battery information from the management unit;
Depending on the result of determining the state of the first battery based on the battery information, the drive function of the motor generator is stopped, or the power generation function of the motor generator is stopped to stop the first battery. And charging of the second battery is stopped.

A control method for a hybrid vehicle power supply apparatus according to an embodiment of the present invention is a hybrid vehicle power supply apparatus, wherein a positive electrode is connected to a first power supply terminal and a negative electrode is connected to a fixed potential. Charging the first battery that is charged by the voltage supplied to the first power supply terminal and outputting the first battery voltage, the positive electrode is connected to the second power supply terminal, and the negative electrode is the fixed Controlling charging of a second battery connected to a potential, charged by a voltage supplied from the down regulator by stepping down the voltage of the first power supply terminal and supplied to the second power supply terminal, and outputting a second battery voltage And a motor generator having a drive function for driving the internal combustion engine and a power generation function for generating an AC voltage by driving the internal combustion engine and outputting an AC voltage, connected to the second power supply terminal, Voltage of the power supply terminal to control the load to be supplied, a control method for a hybrid vehicle power supply system having a control unit,
The control unit operates at the second battery voltage output from the second battery,
When the motor generator is driven, the control unit drives the motor generator by supplying an AC voltage obtained by converting the DC voltage of the first power supply terminal supplied from the first battery to the motor generator. Driving the internal combustion engine,
At the time of power generation of the motor generator, the control unit converts the AC voltage output from the motor generator that generates power by driving the internal combustion engine into a DC voltage, and supplies the DC voltage to the first power supply terminal. Charging the first battery and the second battery;
The control unit acquires the battery information from a management unit that outputs battery information related to the state of the first battery,
Depending on the result of determining the state of the first battery based on the battery information by the controller, the drive function of the motor generator is stopped, or the power generation function of the motor generator is stopped. The charging of the first battery and the second battery is stopped.

A power supply system for a hybrid vehicle according to an aspect of the present invention is connected to an internal combustion engine, and includes a drive function for driving the internal combustion engine and a power generation function for generating electric power by driving the internal combustion engine and outputting an AC voltage. A motor generator, a first battery having a positive electrode connected to a first power supply terminal, a negative electrode connected to a fixed potential, and being charged by a voltage supplied to the first power supply terminal, and outputting a first battery voltage; A management unit that outputs battery information relating to a state of the first battery, a down regulator that steps down the voltage of the first power supply terminal and outputs the voltage to the second power supply terminal, and a positive electrode are connected to the second power supply terminal. A second battery (lead battery) that has a negative electrode connected to a fixed potential, is charged by a voltage supplied to a second power supply terminal, and outputs a second battery voltage; and a second power supply terminal And the second battery voltage output from the second battery to control the motor generator and the load, and at the time of driving the motor generator, By supplying an AC voltage obtained by converting a DC voltage of the first power supply terminal supplied from one battery to the motor generator, the motor generator is driven to drive the internal combustion engine. A control for charging the first battery and the second battery by converting an AC voltage output from a motor generator that rotates and generates electric power by driving an internal combustion engine into a DC voltage and supplying the DC voltage to the first power supply terminal. A section.

And a control part acquires battery information from a management part, and stops the drive function of a motor generator according to the result of having determined the state of the 1st battery based on battery information, or the power generation function of a motor generator To stop the charging of the first battery and the second battery.

Thus, the present invention charges two batteries while controlling the motor generator according to the state of the first battery having a voltage higher than the voltage of the second battery among the two batteries having different voltages. Therefore, the two batteries can be controlled with a simple configuration.

FIG. 1 is a diagram showing a power supply system for a hybrid vehicle according to the present embodiment. FIG. 2 is a diagram illustrating an example of an operation flow of the hybrid vehicle power supply system illustrated in FIG. 1. FIG. 3 is a diagram showing an example of a state determination flow of the first battery B1 shown in FIG. FIG. 4 is a diagram showing an example of a flow for determining the voltage state of the first battery B1 shown in FIG. FIG. 5 is a diagram showing an example of a flow for determining the SOC of first battery B1 shown in FIG. FIG. 6 is a diagram showing an example of a flow for determining the temperature state of the first battery B1 shown in FIG. FIG. 7 is a diagram showing an example of a flow for determining the current state of the first battery B1 shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First embodiment

FIG. 1 is a diagram showing a hybrid vehicle power supply system according to this embodiment.

The hybrid vehicle power supply system 100 according to the present embodiment includes, for example, as shown in FIG. 1, a first battery (lithium ion battery) B1, a second battery (lead battery) B2, and a down regulator (DC DC converter) DR, display unit I, main switch MSW, first relay R1, second relay R2, diode D, load LOAD, motor generator M, control unit (for hybrid vehicle) An electric power supply device (ECU) and an internal combustion engine (engine) E.

The hybrid vehicle power supply system 100 is mounted on, for example, a hybrid motorcycle.

The hybrid vehicle power supply system 100 uses the AC voltage generated by the motor generator M to control charging / discharging of the first and second batteries B1 and B2 mounted on the hybrid motorcycle and to control the load LOAD. It comes to control.

The motor generator M is connected to the internal combustion engine E of the hybrid motorcycle. As will be described later, the control unit ECU drives the motor generator M to start and / or drive the internal combustion engine E.

That is, the motor generator M can function as an alternator (generator) driven by the internal combustion engine E of the hybrid motorcycle, for example. In this case, the motor generator M generates and outputs an AC voltage for charging the first and second batteries B1 and B2 and driving the load LOAD.

As will be described later, the control unit ECU converts the AC voltage generated by the motor generator M into a DC voltage by a driver circuit (H bridge circuit) Y, and converts the DC voltage into first and second switches. The first and second batteries B1 and B2 are supplied via SW1 and SW2.

On the other hand, the motor generator M can also function as a motor for driving the internal combustion engine E of the hybrid motorcycle. In this case, the motor generator M is connected to the internal combustion engine E of the hybrid motorcycle, and the control unit ECU drives the motor generator M with electric power output from the first or second battery B1, B2. The internal combustion engine E is started and / or the internal combustion engine E is driven (rotation is assisted).

Thus, the motor generator M is connected to the internal combustion engine E, and has a drive function for driving the internal combustion engine E and a power generation function for generating electric power by driving the internal combustion engine E and outputting an AC voltage.

The first battery (lithium ion battery) B1 has a positive electrode connected to the first power supply terminal TD1 and a negative electrode connected to a fixed potential (ground potential, ground terminal TG1). The first battery B1 is charged by a voltage supplied to the first power supply terminal TD1, and outputs a first battery voltage (for example, 50V).

The first battery B1 includes, for example, a plurality of lithium ion batteries (cells) connected in series between the first power supply terminal TD1 and the ground potential, as shown in FIG.

Further, the first battery B1 is in a state of the first battery B1 (cell voltage of the first battery B1, SOC of the first battery B1, temperature of the first battery B1, current of the first battery B1). Etc.) is provided with a management unit (communication unit) X for outputting battery information.

The management unit X monitors the state of the first battery B1 (that is, a plurality of lithium ion batteries (cells)) and outputs the above-described battery information to the control unit ECU.

Furthermore, the management unit X is configured to stop charging / discharging of the first battery B1 as necessary when an abnormality occurs in a plurality of lithium ion batteries (cells).

The down regulator DR is a DC-DC converter that steps down the voltage of the first power supply terminal TD1 and outputs it to the second power supply terminal TD2. That is, a voltage obtained by stepping down the voltage of the first power supply terminal TD1 is applied to the second power supply terminal TD2.

The second battery (lead battery) B2 has a positive electrode connected to the second power supply terminal TD2 and a negative electrode connected to the fixed potential (ground potential).

The second battery B2 is charged by the voltage supplied to the second power supply terminal TD2, and outputs a second battery voltage (for example, 14V) lower than the first battery voltage (for example, 50V). It has become.

As described above, the second battery B2 is, for example, a lead battery, and the second battery voltage is, for example, 14V. The electric power of the second battery B2 is used for starting the internal combustion engine E, driving the light and the control unit ECU when there is no abnormality in the first battery B1. As will be described later, the electric power of the second battery B2 is also used for driving the internal combustion engine E (rotation assist) when the first battery B1 is abnormal.

Further, the load LOAD is connected to the second power supply terminal TD2, and the voltage of the second power supply terminal TD2 is supplied.

The load LOAD is driven by a voltage supplied to the second power supply terminal TD2.

The load LOAD is, for example, a light of the hybrid motorcycle, a turn signal, an ignition coil for controlling ignition of the internal combustion engine E, a fuel pump for supplying fuel to the internal combustion engine E, or fuel supplied by the internal combustion engine E This is a mechanism necessary for starting (driving) the internal combustion engine E, such as an injector for injecting fuel.

In addition, the display unit I displays predetermined information to the user. The display unit I is driven by the voltage of the second power supply terminal TD2 (second battery voltage of the second battery B2) or the step-down voltage output from the down regulator DR.

The main switch MSW is connected between the second power supply terminal TD2 and the load LOAD.

The main switch MSW is turned on to supply the voltage of the second power supply terminal TD2 to the load LOAD, and is turned off to cut off the supply of the voltage of the second power supply terminal TD2 to the load LOAD. It has become.

The main switch MSW is controlled to be turned on / off by a user operation.

The first relay R1 has one end connected to the positive electrode of the second battery B2 and the other end connected to the anode of the diode D. On / off of the first relay R1 is controlled by the control unit ECU.

The diode D has an anode connected to the other end of the first relay R1, and a cathode connected to the first power supply terminal TD1.

The second relay R2 is connected between the output of the down regulator DR and the second power supply terminal TD2.

The second relay R2 supplies the step-down voltage output from the down regulator DR to the second power supply terminal TD2 when turned on, while the second relay R2 supplies the step-down voltage output from the down regulator DR to the second power supply when turned off. The supply to the terminal TD2 is cut off.

The second relay R2 is turned on when the main switch MSW is turned on, and is turned off when the main switch MSW is turned off.

Further, the control unit ECU outputs a second battery voltage (from the positive electrode of the second battery B2 to the second power supply terminal TD2 and the main switch MSW that is turned on) output from the second battery (lead battery) B2. The voltage is supplied).

And this control part ECU is provided with the driver circuit (H bridge circuit) Y comprised by the transistor which supplies a motor electric current to the motor generator M, for example, as shown in FIG. In the example of FIG. 1, the case where the control unit ECU is a hybrid vehicle power supply device has been described. However, the hybrid vehicle power supply device has a configuration other than the control unit ECU shown in FIG. 1 may be provided, or a configuration (not shown).

The control unit ECU controls the motor generator M and the load LOAD.

Further, the control unit ECU starts the internal combustion engine E by driving the motor generator M and / or drives the internal combustion engine E.

When the motor generator M is driven, the control unit ECU supplies the motor generator M with an AC voltage obtained by converting the DC voltage of the first power supply terminal TD1 supplied from the first battery B1. To drive the internal combustion engine E.

On the other hand, when the motor generator M generates power, the control unit ECU converts the AC voltage output from the motor generator M that generates power by driving the internal combustion engine E into a DC voltage, and supplies it to the first power supply terminal TD1. The first battery B1 and the second battery B2 are charged.

Also, the control unit ECU acquires battery information from the management unit X. In particular, the control unit ECU determines whether the state of the first battery B1 is normal or abnormal (fails) based on the battery information regarding the state of the first battery B1 output by the management unit X. To come to judge.

The case where the state of the first battery (lithium ion battery) B1 is abnormal means, for example, the case where the cell voltage and current of the lithium ion battery are outside the specified voltage / current range normally used for charging / discharging. If the SOC (State Of Charge) of the lithium ion battery is outside the normal SOC range normally used, the cell temperature of the lithium ion battery is outside the normal temperature range normally used for charging / discharging, or other failure This is a case where the lithium ion battery does not output a predetermined voltage.

Then, the control unit ECU stops the drive function of the motor generator M and drives (rotates) the internal combustion engine E according to the result of determining the state of the first battery B1 based on this battery information (S2 to S5). (Assist) is stopped, or the power generation function of the motor generator M is stopped to stop the charging of the first battery B1 and the second battery B2.

Here, when stopping the drive function of the motor generator M, for example, the control unit ECU opens all the transistors of the H-bridge circuit Y, or shorts the high-side or low-side transistors. ing.

Further, the control unit ECU monitors the voltage of the second power supply terminal TD2 (that is, the voltage supplied from the second power supply terminal TD2 via the main switch MSW) and monitors the second power supply terminal TD2. Is less than the load threshold value that is lower than the load voltage value required to drive the load LOAD, it is determined that the down regulator DR or the second battery B2 has failed.

The control unit ECU stops the control of the load LOAD when the voltage of the second power supply terminal TD2 becomes less than the load threshold described above.

In particular, the control unit ECU outputs information indicating that the down regulator or the second battery B2 is out of order to the display unit I when the voltage of the second power supply terminal TD2 becomes less than the load threshold. It is supposed to be.

In addition, when the internal combustion engine E is started, the control unit ECU turns on the first relay R1 and drives the motor generator M with the second battery voltage output from the second battery B2, so that the internal combustion engine E Is supposed to start.

When the control unit ECU determines that the state of the first battery B1 is normal based on the above-described battery information, the control unit ECU turns off the first relay R1.

Thereby, the control unit ECU drives the motor generator M with the first battery voltage output from the first battery B1 to drive the internal combustion engine E (rotation assist).

Then, the control unit ECU determines that an abnormality has occurred in the state of the first battery B1 based on the above-described battery information, and when the first battery voltage is not output from the first battery B1, 1 relay R1 is turned on.

Thus, the control unit ECU drives the motor generator M with the second battery voltage output from the second battery B2 and drives the internal combustion engine E (rotation assist) when the first battery B1 is abnormal. It is like that.

Further, when the control unit ECU determines that the cell voltage of the first battery B1 is equal to or higher than the full charge threshold that defines full charge based on the battery information described above, the control unit ECU activates the power generation function of the motor generator M. It is supposed to stop.

On the other hand, when the control unit ECU determines that the discharge voltage of the first battery B1 is equal to or lower than a preset cell abnormal voltage threshold value lower than the full charge threshold value based on the battery information described above, The drive function of the generator M is stopped.

Thus, when the cell voltage of the lithium ion battery is outside the specified voltage range normally used for charging and discharging, the control unit ECU stops the power generation function of the motor generator M to prevent overcharging of the lithium ion battery. Alternatively, the drive function of the motor generator M is stopped to prevent overdischarge of the lithium ion battery.

Further, when the control unit ECU determines that the SOC of the first battery B1 is equal to or higher than a preset SOC stipulated threshold based on the above-described battery information, the control unit ECU stops the power generation function of the motor generator M. It is like that.

On the other hand, when the control unit ECU determines that the SOC of the first battery B1 is equal to or lower than a preset SOC abnormality threshold value lower than the SOC regulation threshold value based on the battery information described above, the motor generator M The drive function is stopped.

In this way, the control unit ECU stops the power generation function of the motor generator M to prevent overcharging of the lithium ion battery when the SOC (State Of Charge) of the lithium ion battery is outside the specified SOC range normally used. Alternatively, the drive function of the motor generator M is stopped to prevent overdischarge of the lithium ion battery.

Further, when the control unit ECU determines that the temperature of the first battery B1 is equal to or higher than a preset high temperature abnormality threshold based on the battery information described above, the control unit ECU stops the power generation function of the motor generator M. Alternatively, the drive function of the motor generator M is stopped.

On the other hand, when the control unit ECU determines that the temperature of the first battery B1 is lower than a preset low temperature abnormality threshold value lower than the high temperature abnormality threshold value based on the above-described battery information, the motor generator The power generation function of M is stopped, or the drive function of the motor generator M is stopped.

As described above, the control unit ECU stops the power generation function of the motor generator M or switches the drive function of the motor generator M when the cell temperature of the lithium ion battery is outside the specified temperature range normally used for charging and discharging. The battery is stopped and an excessive temperature rise of the lithium ion battery is suppressed to prevent rupture or the like.

Further, when the control unit ECU determines that the charging current flowing through the first battery B1 is equal to or more than a preset excessive charging current threshold based on the above-described battery information, the power generation function of the motor generator M Is supposed to stop.

On the other hand, when the control unit ECU determines that the discharge current flowing through the first battery B1 is greater than or equal to a preset excessive discharge current threshold based on the above-described battery information, the drive function of the motor generator M is determined. Is supposed to stop.

In this way, the control unit ECU stops the power generation function of the motor generator M or drives the motor generator M when the cell voltage and current of the lithium ion battery are outside the specified current range normally used for charging and discharging. The function is stopped to prevent the overcurrent of the lithium ion battery from flowing to prevent bursting and the like.

As described above, when stopping the drive function of the motor generator M, the control unit ECU, for example, opens all the transistors of the H-bridge circuit Y, or shorts the high-side or low-side transistors. To do.

Next, an example of the operation flow of the control method of the hybrid vehicle power supply system 100 having the above configuration will be described. Here, FIG. 2 is a diagram showing an example of an operation flow of the hybrid vehicle power supply system shown in FIG. FIG. 3 is a diagram showing an example of a state determination flow of the first battery B1 shown in FIG.

For example, as described above, the control unit ECU of the hybrid vehicle power supply system 100 acquires battery information from the management unit X. And based on the battery information regarding the state of the 1st battery B1 which the control part ECU output from the management part X, the state of the 1st battery B1 is normal or abnormal (whether it has failed) Is determined (step SX in FIG. 2).

Then, the control unit ECU controls the motor generator M based on the result of determining the state of the first battery B1 (step SY in FIG. 2).

Here, as shown in FIG. 3, when determining the state of the first battery B1, the control unit ECU acquires battery information from the management unit X (step S1). Then, the control unit ECU determines the voltage state of the first battery B1 based on the battery information (step S2), determines the SOC of the first battery B1 (step S3), and the first battery B1. Is determined (step S4), and the current state of the first battery B1 is determined (step S5).

Here, FIG. 4 is a diagram showing an example of a flow for determining the voltage state of the first battery B1 shown in FIG.

For example, as shown in FIG. 4, in step S <b> 2 described above, the control unit ECU determines whether or not the cell voltage of the first battery B <b> 1 indicated by the battery information is greater than or equal to a full charge threshold value that defines full charge. Is determined (detected) (step S21).

When the control unit ECU determines that the cell voltage of the first battery B1 is equal to or higher than the full charge threshold based on the battery information, the control unit ECU stops the power generation function of the motor generator M.

In step S2 described above, the control unit ECU has a discharge voltage (cell voltage) of the first battery B1 indicated by the battery information equal to or lower than a preset cell abnormal voltage threshold value lower than the full charge threshold value. Is determined (detected) (step S22).

When the control unit ECU determines that the discharge voltage of the first battery B1 is equal to or lower than the abnormal voltage threshold based on the above-described battery information, the control unit ECU stops the drive function of the motor generator M.

Here, FIG. 5 is a diagram showing an example of a flow for determining the SOC of the first battery B1 shown in FIG.

For example, as shown in FIG. 5, in step S <b> 3 described above, the control unit ECU determines whether or not the SOC of the first battery B <b> 1 indicated by the battery information is greater than or equal to a preset SOC regulation threshold value. (Detection) is performed (step S31).

The control unit ECU stops the power generation function of the motor generator M when it is determined that the SOC of the first battery B1 is equal to or higher than the SOC regulation threshold based on the battery information described above.

In step S3 described above, the control unit ECU determines whether or not the SOC of the first battery B1 indicated by the battery information is equal to or lower than a preset SOC abnormality threshold value lower than the SOC regulation threshold value ( Detection) (step S32).

When the control unit ECU determines that the SOC of the first battery B1 is equal to or lower than a preset SOC abnormality threshold value lower than the SOC regulation threshold value based on the battery information described above, the motor generator M The drive function of is stopped.

Here, FIG. 6 is a diagram showing an example of a flow for determining the temperature state of the first battery B1 shown in FIG.

For example, as shown in FIG. 6, in step S4 described above, the control unit ECU determines whether or not the temperature of the first battery B1 indicated by the battery information is equal to or higher than a preset high temperature abnormality threshold value. (Detection) is performed (step S41).

When the control unit ECU determines that the temperature of the first battery B1 is equal to or higher than the high temperature abnormality threshold based on the above-described battery information, the control unit ECU stops the power generation function of the motor generator M, or The drive function of the motor generator M is stopped.

Further, in the above-described step S4, the control unit ECU determines whether or not the temperature of the first battery B1 indicated by the battery information is lower than a preset low temperature abnormality threshold value that is lower than the high temperature abnormality threshold value ( Detection) (step S41).

Then, when the control unit ECU determines that the temperature of the first battery B1 is lower than the low temperature abnormality threshold based on the above-described battery information, the control unit ECU stops the power generation function of the motor generator M, or The drive function of the motor generator M is stopped.

As described above, the control unit ECU stops the power generation function of the motor generator M or switches the drive function of the motor generator M when the cell temperature of the lithium ion battery is outside the specified temperature range normally used for charging and discharging. Stop and suppress excessive temperature rise of the lithium ion battery to prevent bursting and the like.

Here, FIG. 7 is a diagram showing an example of a flow for determining the current state of the first battery B1 shown in FIG.

For example, as shown in FIG. 7, in the above-described step S5, the control unit ECU sets the overcharge current threshold (or the discharge current in advance) to which the charge current of the first battery B1 indicated by the battery information is set in advance. It is judged (detected) whether or not it is equal to or more than the set excessive discharge current threshold value (step S51).

When the control unit ECU determines that the charging current flowing through the first battery B1 is equal to or greater than a preset excessive charging current threshold based on the above-described battery information, the power generation function of the motor generator M is determined. Stop.

Further, when the control unit ECU determines that the discharge current flowing through the first battery B1 is equal to or greater than a preset excessive discharge current threshold based on the above-described battery information, the drive function of the motor generator M is determined. Stop.

In this way, the control unit ECU stops the power generation function of the motor generator M or drives the motor generator M when the cell voltage and current of the lithium ion battery are outside the specified current range normally used for charging and discharging. The function is stopped to prevent the overcurrent of the lithium ion battery from flowing to prevent bursting or the like.

As described above, the hybrid vehicle power supply system according to one aspect of the present invention is connected to the internal combustion engine, and generates power by driving the internal combustion engine and driving the internal combustion engine to output an alternating voltage. A motor generator having a function, a positive electrode is connected to the first power supply terminal, a negative electrode is connected to a fixed potential, is charged by a voltage supplied to the first power supply terminal, and outputs a first battery voltage A first battery (lithium ion battery), a management unit that outputs battery information relating to the state of the first battery, a down regulator that steps down the voltage of the first power supply terminal and outputs the voltage to the second power supply terminal; The positive electrode is connected to the second power supply terminal, the negative electrode is connected to a fixed potential, and is charged by the voltage supplied to the second power supply terminal, and is lower than the first battery voltage. A second battery (lead battery) that outputs a battery voltage, a load connected to the second power supply terminal and supplied with the voltage of the second power supply terminal, and a second battery voltage output by the second battery The motor generator and the load are controlled, and when the motor generator is driven, the motor generator is supplied with an AC voltage obtained by converting the DC voltage of the first power supply terminal supplied from the first battery. The generator is driven to drive the internal combustion engine. On the other hand, at the time of power generation by the motor generator, the AC voltage output from the motor generator that rotates and generates power by driving the internal combustion engine is converted into a DC voltage and applied to the first power supply terminal. A controller that charges the first battery and the second battery by supplying the first battery;

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

100 Hybrid vehicle power supply system B1 First battery (lithium ion battery)
B2 Second battery (lead battery)
DR down regulator (DC-DC converter)
I display unit MSW main switch R1 first relay R2 second relay D diode LOAD load M motor generator ECU control unit (power supply device for hybrid vehicle)
E Internal combustion engine

Claims

A power supply device for a hybrid vehicle,
The positive electrode is connected to the first power supply terminal and the negative electrode is connected to a fixed potential, and charging is performed by the voltage supplied to the first power supply terminal, and charging of the first battery that outputs the first battery voltage is controlled. The positive electrode is connected to the second power supply terminal and the negative electrode is connected to the fixed potential, and the voltage of the first power supply terminal is reduced by a down regulator and charged by the voltage supplied to the second power supply terminal. , Controlling the charging of the second battery that outputs the second battery voltage, and controlling the motor generator having a drive function for driving the internal combustion engine and a power generation function for generating an AC voltage by driving the internal combustion engine And a control unit for controlling a load connected to the second power supply terminal and supplied with the voltage of the second power supply terminal,
The controller is
Operating at the second battery voltage output by the second battery;
When the motor generator is driven, an AC voltage obtained by converting a DC voltage of the first power supply terminal supplied from the first battery is supplied to the motor generator, so that the motor generator is driven to drive the internal combustion engine. Drive the
At the time of power generation of the motor generator, the AC voltage output from the motor generator that generates power by driving the internal combustion engine is converted into a DC voltage and supplied to the first power supply terminal, whereby the first battery and Charging the second battery;
Obtaining the battery information from a management unit that outputs battery information relating to the state of the first battery;
Depending on the result of determining the state of the first battery based on the battery information, the drive function of the motor generator is stopped, or the power generation function of the motor generator is stopped to stop the first battery. And stopping charging of the second battery. A power supply apparatus for a hybrid vehicle, wherein:
The power supply apparatus for a hybrid vehicle according to claim 1, wherein the first battery voltage of the second battery is lower than the first battery voltage of the first battery.
The controller is
The voltage of the second power supply terminal is monitored, and if the voltage of the second power supply terminal becomes lower than a load threshold value lower than a load voltage value necessary for driving the load, the down The vehicle power supply device according to claim 2, wherein the regulator or the second battery is determined to be malfunctioning.
The controller is
The hybrid vehicle power supply apparatus according to claim 3, wherein when the voltage of the second power supply terminal becomes less than the load threshold, the control of the load is stopped.
The hybrid vehicle power supply device includes:
Mounted on a hybrid motorcycle, the motor generator is connected to an internal combustion engine of the hybrid motorcycle, and the control unit starts the internal combustion engine by driving the motor generator and / or drives the internal combustion engine The vehicular power supply device according to claim 4.
The vehicle power supply device according to claim 5, wherein the load includes at least one of a light, a blinker, an ignition coil, a fail pump, and an injector of the hybrid motorcycle.
The load is connected between the second power supply terminal and the load, and when turned on, the voltage of the second power supply terminal is supplied to the load, and when turned off, the load of the voltage of the second power supply terminal is supplied. A main switch that is turned off and on by a user operation,
A first relay having one end connected to the positive electrode of the second battery and controlled to be turned on / off by the control unit;
A diode having an anode connected to the other end of the first relay and a cathode connected to the first power supply terminal;
Connected between the output of the down regulator and the second power supply terminal, the step-down voltage output from the down regulator is supplied to the second power supply terminal by turning on, and the down regulator is turned off by turning off. A second relay that cuts off the supply of the output stepped-down voltage to the second power supply terminal, turns on when the main switch is turned on, and turns off when the main switch is turned off;
The controller is
If it is determined that the state of the first battery is normal based on the battery information, the first relay is maintained off;
Determining that an abnormality has occurred in the state of the first battery based on the battery information, and turning on the first relay when the first battery voltage is not output from the first battery; The vehicle power supply device according to claim 3.
The controller is
When the voltage of the second power supply terminal is less than the load threshold, information indicating that the down regulator or the second battery is out of order is output to the display unit. Item 7. The vehicle power supply device according to Item 6.
The controller is
Based on the battery information, when it is determined that the cell voltage of the first battery is equal to or higher than a full charge threshold value that defines full charge, the power generation function of the motor generator is stopped, and the first 6. The drive function of the motor generator is stopped when it is determined that the discharge voltage of the battery is equal to or lower than a preset cell abnormal voltage threshold lower than the full charge threshold. Power supply device for hybrid vehicles.
The controller is
If it is determined based on the battery information that the SOC of the first battery is greater than or equal to a preset SOC regulation threshold, the power generation function of the motor generator is stopped, while the first battery The hybrid vehicle according to claim 5, wherein the drive function of the motor generator is stopped when it is determined that the SOC of the motor generator is equal to or lower than a preset SOC abnormality threshold value lower than the SOC regulation threshold value. Power supply device.
The controller is
Based on the battery information, when it is determined that the temperature of the first battery is equal to or higher than a preset high temperature abnormality threshold, and the temperature of the first battery is preset lower than the high temperature abnormality threshold. 6. The hybrid vehicle according to claim 5, wherein when it is determined that the temperature is less than the low-temperature abnormality threshold, the power generation function of the motor generator is stopped or the driving function of the motor generator is stopped. Power supply equipment.
The controller is
Based on the battery information, when it is determined that the charging current flowing through the first battery is equal to or higher than a preset excessive charging current threshold, the power generation function of the motor generator is stopped, while the first 6. The hybrid vehicle according to claim 5, wherein the drive function of the motor generator is stopped when it is determined that a discharge current flowing through one battery is greater than or equal to a preset excessive discharge current threshold value. 7. Power supply device.
The control unit includes an H-bridge circuit configured by a transistor that is driven by supplying a motor current to the motor generator,
6. The hybrid vehicle according to claim 5, wherein when the driving function of the motor generator is stopped, all the transistors of the H-bridge circuit are opened, or the high-side or low-side transistors are short-circuited. Power supply equipment.
The first battery is a lithium ion battery;
The hybrid vehicle power supply device according to claim 5, wherein the second battery is a lead battery.
A motor generator connected to an internal combustion engine, and having a drive function for driving the internal combustion engine and a power generation function for generating an alternating voltage by driving the internal combustion engine;
A first battery having a positive electrode connected to a first power supply terminal, a negative electrode connected to a fixed potential, charged by a voltage supplied to the first power supply terminal, and outputting a first battery voltage;
A management unit that outputs battery information relating to a state of the first battery;
A down regulator for stepping down the voltage of the first power supply terminal and outputting it to the second power supply terminal;
A second battery that has a positive electrode connected to the second power supply terminal, a negative electrode connected to the fixed potential, is charged by a voltage supplied to the second power supply terminal, and outputs a second battery voltage;
A load connected to the second power supply terminal and supplied with the voltage of the second power supply terminal;
The first power supply terminal that is operated by the second battery voltage output from the second battery, controls the motor generator and the load, and is supplied from the first battery when the motor generator is driven. By supplying an alternating voltage obtained by converting the direct current voltage to the motor generator, the motor generator is driven to drive the internal combustion engine. On the other hand, when the motor generator generates electric power, the internal combustion engine is driven to generate electric power. A controller that converts the AC voltage output by the motor generator into a DC voltage and supplies the first power supply terminal to charge the first battery and the second battery;
The controller is
Obtaining the battery information from the management unit;
Depending on the result of determining the state of the first battery based on the battery information, the drive function of the motor generator is stopped, or the power generation function of the motor generator is stopped to stop the first battery. And stopping charging of the second battery. A power supply system for a hybrid vehicle.
A power supply device for a hybrid vehicle, wherein a positive electrode is connected to a first power supply terminal and a negative electrode is connected to a fixed potential, and is charged by a voltage supplied to the first power supply terminal. The charging of the first battery to be output is controlled, the positive electrode is connected to the second power supply terminal, the negative electrode is connected to the fixed potential, and the down regulator steps down the voltage of the first power supply terminal to The battery is charged by the voltage supplied to the power supply terminal of the first battery, and the second battery that outputs the second battery voltage is controlled to be charged. Controlling a motor generator having a power generation function for controlling a load connected to the second power supply terminal and supplied with the voltage of the second power supply terminal, the hybrid vehicle power having a controller A method of controlling a charging device,
The control unit operates at the second battery voltage output from the second battery,
When the motor generator is driven, the control unit drives the motor generator by supplying an AC voltage obtained by converting the DC voltage of the first power supply terminal supplied from the first battery to the motor generator. Driving the internal combustion engine,
At the time of power generation of the motor generator, the control unit converts the AC voltage output from the motor generator that generates power by driving the internal combustion engine into a DC voltage, and supplies the DC voltage to the first power supply terminal. Charging the first battery and the second battery;
The control unit acquires the battery information from a management unit that outputs battery information related to the state of the first battery,
Depending on the result of determining the state of the first battery based on the battery information by the controller, the drive function of the motor generator is stopped, or the power generation function of the motor generator is stopped. Charging of the first battery and the second battery is stopped. A method for controlling a hybrid vehicle power supply apparatus, wherein: