JP2011101483A - Drive power supply apparatus for vehicles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a drive power supply apparatus for vehicles whose operation can be continued without influence on a drive system or an electrical load when a failure occurs in a power supply system. <P>SOLUTION: The drive power supply apparatus includes a first power supply device 3 that supplies power to a rotary electric machine through an inverter 2 between the power supply device and the rotary electric machine 1 and receives regenerative power from the rotary electric machine, a second power supply device 4 that can be charged and discharged faster than the first power supply device is, a voltage conversion device 5 that is connected between a power supply line SL connecting together the first power supply device 3 and the inverter 2 and the second power supply device and converts the voltage of the second power supply device for supplying driving force to the rotary electric machine through the inverter, an anomaly detecting means 7 that detects any internal anomaly in the voltage conversion device or the second power supply device and generates an anomaly signal, switching means 6, 5a that connect and disconnect the voltage conversion device and the power supply line to and from each other, and a controller 8 that, on receiving an anomaly signal from the anomaly detecting means, opens the switching means to separate the voltage conversion device and the second power supply device from the power supply line. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle drive power supply device, and more particularly to a vehicle drive power supply device for driving a rotating electrical machine represented by a permanent magnet AC synchronous motor.

  About a vehicle drive power supply device for driving a rotating electrical machine represented by a permanent magnet type AC synchronous motor by using a secondary battery and a storage battery that can be charged / discharged more rapidly than a secondary battery. Many proposals have been made in the past. For example, in Patent Document 1 below, a battery and a large-capacity capacitor for power storage are connected in parallel, and electric energy stored in the large-capacity capacitor is effectively taken out and used via a booster circuit. A method is disclosed that allows an extension of the cruising range of an automobile.

JP-A-6-276616

  In the above-mentioned Patent Document 1, a method of extending the cruising range by using a battery and a large-capacity capacitor is proposed, but a proposal for a case where a component such as a booster circuit or a large-capacitance capacitor fails occurs. Not shown. For example, when a short-circuit failure occurs at the input / output terminal of the booster circuit, a voltage exceeding the allowable value is applied to the large-capacitance capacitor via the booster circuit, which may cause a reduction in function or destruction of the large-capacity capacitor. In addition, unnecessary power flows from the battery to the large-capacity capacitor via the booster circuit, which may cause the drive system and electrical load to degrade or fail, and the cruising range will be shorter than normal. There is also a possibility that.

  Also, for example, when a short-circuit failure occurs in a large-capacity capacitor, the vehicle power supply system is short-circuited via the large-capacitance capacitor, which greatly affects the drive system and electric load of the vehicle, such as reduced functionality and inoperability. There is a fear.

  The present invention solves such problems, and when a failure occurs in an element constituting a power supply system (a boost circuit (voltage converter), a large-capacitance capacitor, etc.), the power supply is detected and appropriately dealt with. It is an object of the present invention to provide a vehicle drive power supply device that can continue the operation of a vehicle drive system (rotary electric machine, inverter, etc.) or an electric load without being affected by the occurrence of a failure of a system component.

  The present invention provides a first power supply apparatus that supplies power stored in the rotating electrical machine via an inverter to and from the rotating electrical machine that drives the vehicle, and that receives regenerative power from the rotating electrical machine, A second power supply device that stores electric power that can be charged and discharged more rapidly than the power supply device, a power supply line that connects the first power supply device and the inverter, and the second power supply device, and the inverter A voltage conversion device that converts the voltage of the second power supply device to supply driving power to the rotating electrical machine via an abnormality, and detects an internal abnormality of the voltage conversion device or the second power supply device to detect an abnormal signal An abnormality detecting means for generating a voltage, an opening / closing means for connecting / disconnecting the voltage conversion device and the power supply line, and the voltage conversion by opening the opening / closing means when receiving an abnormality signal from the abnormality detecting means. apparatus Preliminary in vehicle drive power supply device is characterized in that the second power supply and a control device for separating from the power line.

  According to the present invention, it is possible to provide a vehicular drive power supply apparatus that can continue the operation without affecting the drive system and the electric load when a failure occurs in the power supply system.

It is a figure which shows the structure of the drive power supply device for vehicles by Embodiment 1 of this invention. It is a flowchart which shows the outline of the process sequence of the input / output short circuit detection apparatus in Embodiment 1 of this invention. It is a flowchart which shows the outline of the process sequence of the failure detection process of FIG. It is a flowchart which shows the outline of the process sequence of the switch control process of FIG. It is a figure which shows the structure of the drive power supply device for vehicles by Embodiment 2 of this invention. It is a flowchart which shows the outline of the process sequence of the output overvoltage detection apparatus in Embodiment 2 of this invention. It is a flowchart which shows the outline of the process sequence of the failure detection process of FIG. It is a flowchart which shows the outline of the process sequence of the switch control process of FIG. It is a figure which shows the structure of the drive power supply device for vehicles by Embodiment 3 of this invention. It is a flowchart which shows the outline of the process sequence of the output overcurrent detection apparatus in Embodiment 3 of this invention. It is a flowchart which shows the outline of the process sequence of the failure detection process of FIG. It is a flowchart which shows the outline of the process sequence of the switch control process of FIG. It is a figure which shows the structure of the drive power supply device for vehicles by Embodiment 4 of this invention. It is a flowchart which shows the outline of the process sequence of the overheat detection apparatus in Embodiment 4 of this invention. It is a flowchart which shows the outline of the process sequence of the failure detection process of FIG. It is a flowchart which shows the outline of the process sequence of the switch control process of FIG. It is a figure which shows the structure of the drive power supply device for vehicles by Embodiment 5 of this invention. It is a flowchart which shows the outline of the process sequence of the open fault detection apparatus in Embodiment 5 of this invention. It is a flowchart which shows the outline of the process sequence of the failure detection process of FIG. It is a flowchart which shows the outline of the process sequence of the switch control process of FIG. It is a figure which shows the structure of the drive power supply device for vehicles by Embodiment 6 of this invention. It is a flowchart which shows the outline of the process sequence of the open fault detection apparatus in Embodiment 6 of this invention. It is a flowchart which shows the outline of the process sequence of the failure detection process of FIG. It is a flowchart which shows the outline of the process sequence of the switch control process of FIG. It is a figure which shows the structure of the drive power supply device for vehicles by Embodiment 7 of this invention. It is a flowchart which shows the outline of the process sequence of the short circuit fault detection apparatus in Embodiment 7 of this invention. It is a flowchart which shows the outline of the process sequence of the failure detection process of FIG. It is a flowchart which shows the outline of the process sequence of the switch control process of FIG. It is a figure which shows the structure of the drive power supply device for vehicles by Embodiment 8 of this invention. It is a flowchart which shows the outline of the process sequence of the short circuit fault detection apparatus in Embodiment 8 of this invention. FIG. 31 is a flowchart showing an outline of a processing procedure of failure detection processing of FIG. 30. FIG. FIG. 31 is a flowchart showing an outline of a processing procedure of switch control processing of FIG. 30. FIG. It is a figure which shows the structure of the drive power supply device for vehicles by Embodiment 9 of this invention. It is a flowchart which shows the outline of the process sequence of the ground fault detector in Embodiment 9 of this invention. It is a flowchart which shows the outline of the process sequence of the failure detection process of FIG. It is a flowchart which shows the outline of the process sequence of the switch control process of FIG. It is a figure which shows the structure of the drive power supply device for vehicles by Embodiment 10 of this invention. It is a flowchart which shows the outline of the process sequence of the ground fault detector in Embodiment 10 of this invention. FIG. 39 is a flowchart showing an outline of a processing procedure of failure detection processing of FIG. 38. FIG. FIG. 39 is a flowchart showing an outline of a processing procedure of switch control processing of FIG. 38. FIG.

  Hereinafter, a vehicle drive power supply device according to the present invention will be described with reference to the drawings according to each embodiment. In each embodiment, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

Embodiment 1 FIG.
1 is a diagram showing a configuration of a vehicle drive power supply apparatus according to Embodiment 1 of the present invention. In FIG. Reference numeral 1 denotes a rotating electrical machine that generates a driving force of a vehicle, for example, a permanent magnet AC synchronous motor (hereinafter abbreviated as a motor), 2 denotes a power converter that converts power supplied to the motor 1, for example, an inverter, and 3 denotes stored power Is, for example, a lithium-ion battery that is a first power supply device that supplies regenerative power of the motor 1 to the motor 1 via the inverter 2.

  Reference numeral 4 denotes a second power supply device that can charge and discharge more rapidly than the lithium ion battery 3, for example, a capacitor, and 5 denotes a voltage for converting the voltage of the capacitor 4 to supply driving power to the motor 1 via the inverter 2. A conversion device 6 is an open / close means for connecting and separating the voltage conversion device 5 and the capacitor 4 to and from the power supply line SL connecting the lithium ion battery 3 and the inverter 2, for example, a changeover switch 7 is an input / output current of the voltage conversion device 5 For example, an input / output short-circuit detection device, which is an abnormality detection means for detecting a short-circuit failure by detecting each of them by the current detector A, for example, 8 controls opening / closing of the changeover switch 6 according to an abnormal signal based on the detection from the input / output short-circuit detection device 7 Each control device is shown.

  In the voltage conversion device 5, for example, a semiconductor switch 5a, which is an opening / closing means, an inductor 5c including an iron core, and a capacitor 4 are connected in series from the selector switch 6 side to the ground. This is a step-up / step-down circuit in which a semiconductor switch 5b is connected between a connection point with the inductor 5c and the ground side of the capacitor 4. The operation of the step-up / step-down operation is performed by, for example, controlling the semiconductor switches 5a and 5b by another control device (not shown) or the control device 8 and controlling the switching. However, since it is not directly related to the present invention, detailed description is given here. Description is omitted.

  In the embodiment to be described, it is assumed that the lithium ion battery 3 is used as the first power supply device and the capacitor 4 is used as the second power supply device. However, the present invention is not limited to these. The second power supply device may be constituted by other means. Further, as long as the configuration includes the voltage conversion device 5 and the capacitor 4, the lithium ion battery 3 may be another type of power source. Further, a voltage converter (not shown) for converting a voltage may be further included between the lithium ion battery 3 and the inverter 2. In the embodiment to be described, it is assumed that a relay is used as the changeover switch 6, but the present invention is not limited to this, and a changeover switch having another configuration may be used.

  Next, the operation will be described. FIG. 2 is a flowchart showing an outline of the processing procedure of the input / output short-circuit detection device 7 in this embodiment. A failure (short-circuit between input and output) of the voltage converter 5 is detected in the failure detection process (S1), and a changeover switch control instruction to the control device 8 is determined in the switch control process (S2) based on the result.

  FIG. 3 is a flowchart showing an outline of the processing procedure of the failure detection processing (S1) of FIG. In this embodiment, the case where the short circuit failure of the input / output of the voltage converter 5 is detected is shown. The input current Iin acquired by the current detector A at the input / output terminal of the voltage conversion device 5 is compared with the output current Iout (S1a). If they match, it is assumed that a short-circuit failure between the input and output of the voltage conversion device 5 has occurred. The failure detection state is set (S1b). If the input current Iin and the output current Iout of the voltage conversion device 5 do not match, the voltage conversion device 5 is assumed to be operating normally and is set to a failure undetected state (S1c). In this embodiment, the input / output short-circuit fault of the voltage converter 5 is detected from the input current and output current of the voltage converter 5, but the means used is not limited to this, and other means are used. It does not matter.

  After the failure detection process, the process proceeds to the switch control process. FIG. 4 is a flowchart showing an outline of the processing procedure of the switch control processing (S2) of FIG. If it is determined in the failure detection process (S1 = S2a) that a failure has been detected, an abnormal signal serving as an instruction to open the changeover switch 6 is output to the control device 8 (S2b). As a result, the control device 8 opens the changeover switch 6. If it is determined in the failure detection process (S1 = S2a) that the failure has not been detected, a signal that is a closing instruction of the changeover switch 6 (in this case, closed) is output to the control device 8 (or the current state is maintained). Therefore, no signal is output (the same applies hereinafter) (S2c).

  As described above, when the input / output short-circuit detection device 7 detects an input / output short-circuit fault of the voltage conversion device 5, the change-over switch 6 is opened from the input / output short-circuit detection device 7 to the control device 8. Since the voltage conversion device 5 and the capacitor 4 are instructed to be disconnected from the power supply line SL to which the lithium ion battery 3 is connected, it is possible to prevent power exceeding the allowable value from being applied to the capacitor 4 via the voltage conversion device 5. It is possible to prevent functional degradation or destruction of the capacitor 4 in advance. In addition, the flow of power from the lithium ion battery 3 to the capacitor 4 via the voltage conversion device 5 causes the power of the lithium ion battery 3 to be consumed unnecessarily, and a drive system and an electric load including the motor 1 and the inverter 2 are required. It is possible to prevent a situation where the function is deteriorated or becomes inoperable, and it is possible to suppress a reduction in the cruising range.

Embodiment 2. FIG.
FIG. 5 is a diagram showing a configuration of a vehicle drive power supply device according to Embodiment 2 of the present invention. In this embodiment, an output overvoltage detection device 17 for detecting an output overvoltage by detecting the input / output voltage of the voltage conversion device 5 by, for example, the voltage detector V is provided as an abnormality detection means.

  Next, the operation will be described. FIG. 6 is a flowchart showing an outline of the processing procedure of the output overvoltage detection device 17 in this embodiment. A failure (output overvoltage) of the voltage converter 5 is detected in the failure detection process (S1), and a changeover switch control instruction to the control device 8 is determined in the switch control process (S2) based on the result.

  FIG. 7 is a flowchart showing an outline of the processing procedure of the failure detection processing (S1) of FIG. In this embodiment, the case where the output overvoltage of the voltage converter 5 is detected is shown. The output voltages V1 and V2 acquired by the voltage detector V at the input / output terminal of the voltage converter 5 are compared with a predetermined threshold Vth (S1a), and if at least one of the output voltages V1 and V2 is greater than the threshold Vth, the voltage conversion The output of the device 5 is set to a fault detection state as an overvoltage (S1b). When the output voltages V1 and V2 of the voltage converter 5 are both equal to or lower than the threshold value Vth, the voltage converter 5 is assumed to be operating normally and is set to a failure undetected state (S1c). In this embodiment, the output overvoltage is detected from the output voltage of the voltage conversion device 5 and a predetermined threshold, but the means to be used is not limited to this, and other means may be used.

  After the failure detection process, the process proceeds to the switch control process. FIG. 8 is a flowchart showing an outline of the processing procedure of the switch control processing (S2) of FIG. If it is determined in the failure detection process (S1 = S2a) that a failure has been detected, an abnormal signal serving as an instruction to open the changeover switch 6 is output to the control device 8 (S2b). As a result, the control device 8 opens the changeover switch 6. If it is determined in the failure detection process (S1 = S2a) that the failure has not been detected, a signal that is a closing instruction of the changeover switch 6 (in this case, closed) is output to the control device 8 (or the current state is maintained). Therefore, no signal is output) (S2c).

  As described above, when the output overvoltage detection device 17 detects the output overvoltage of the voltage conversion device 5, the changeover switch 6 is opened to the control device 8 from the output overvoltage detection device 17 to the voltage conversion device. 5 and the capacitor 4 are instructed to be disconnected from the power supply line SL, so that it is possible to prevent the drive system, the lithium ion battery 3 and the capacitor 4 from being overloaded, and the function deterioration, malfunction or destruction caused by the overload. Can be prevented, and shortening of the cruising range can be suppressed.

Embodiment 3 FIG.
FIG. 9 is a diagram showing a configuration of a vehicle drive power supply device according to Embodiment 3 of the present invention. In this embodiment, an output overcurrent detection device 27 for detecting an output overcurrent by detecting the input / output current of the voltage conversion device 5 by, for example, the current detector A is provided as an abnormality detection means.

  Next, the operation will be described. FIG. 10 is a flowchart showing an outline of the processing procedure of the output overcurrent detection device 27 in this embodiment. A failure (output overcurrent) of the voltage converter 5 is detected in the failure detection process (S1), and a changeover switch control instruction to the control device 8 is determined in the switch control process (S2) based on the result.

  FIG. 11 is a flowchart showing an outline of the processing procedure of the failure detection processing (S1) of FIG. In this embodiment, the case where the output overcurrent of the voltage converter 5 is detected is shown. The output currents I1 and I2 acquired by the current detector A at the input / output terminal of the voltage converter 5 are compared with a predetermined threshold value Ith (S1a), and if at least one of the output currents I1 and I2 is larger than the threshold value Ith, the voltage conversion The output of the device 5 is set as a fault detection state as an overcurrent (S1b). When the output currents I1 and I2 of the voltage conversion device 5 are both equal to or less than the threshold value Ith, the voltage conversion device 5 is assumed to be operating normally and set to a failure undetected state (S1c). In this embodiment, the output overcurrent is detected from the output current of the voltage conversion device 5 and a predetermined threshold. However, the means used is not limited to this, and other means may be used.

  After the failure detection process, the process proceeds to the switch control process. FIG. 12 is a flowchart showing an outline of the processing procedure of the switch control processing (S2) of FIG. If it is determined in the failure detection process (S1 = S2a) that a failure has been detected, an abnormal signal serving as an instruction to open the changeover switch 6 is output to the control device 8 (S2b). As a result, the control device 8 opens the changeover switch 6. If it is determined in the failure detection process (S1 = S2a) that the failure has not been detected, a signal that is a closing instruction of the changeover switch 6 (in this case, closed) is output to the control device 8 (or the current state is maintained). Therefore, no signal is output) (S2c).

  As described above, when the output overcurrent of the voltage converter 5 is detected by the output overcurrent detection device 27, the changeover switch 6 is opened from the output overcurrent detection device 27 to the control device 8. Since the voltage conversion device 5 and the capacitor 4 are instructed to be disconnected from the power supply line SL, it is possible to prevent the drive system, the lithium ion battery 3 and the capacitor 4 from being overloaded, and to reduce the function or cause the malfunction due to the overload. It can prevent operation or destruction, and can suppress the shortening of the cruising range.

Embodiment 4 FIG.
FIG. 13 is a diagram showing a configuration of a vehicle drive power supply apparatus according to Embodiment 4 of the present invention. In this embodiment, as the abnormality detection means, an overheat detection device 37 that detects the overheat by detecting the temperature in the voltage converter 5 by, for example, one or more temperature sensors t is provided.

  Next, the operation will be described. FIG. 14 is a flowchart showing an outline of a processing procedure of the overheat detection device 37 in this embodiment. A failure (overheating) of the voltage converter 5 is detected in the failure detection process (S1), and a changeover switch control instruction to the control device 8 is determined in the switch control process (S2) based on the result.

  FIG. 15 is a flowchart showing an outline of the processing procedure of the failure detection processing (S1) of FIG. In this embodiment, the case where overheating of the voltage converter 5 is detected is shown. The measured temperature T acquired by the temperature sensor t of the voltage conversion device 5 is compared with a predetermined threshold value Tth (S1a), and when the measured temperature T is larger than the threshold value Tth, the voltage conversion device 5 is set to an overheated state and set to a failure detection state. (S1b). When the measured temperature T of the voltage conversion device 5 is equal to or lower than the threshold value Tth, the voltage conversion device 5 is assumed to be operating normally and is set to a failure undetected state (S1c). In this embodiment, the overheat state is detected from the measured temperature of the voltage conversion device 5 and a predetermined threshold, but the means to be used is not limited to this, and other means may be used.

  After the failure detection process, the process proceeds to the switch control process. FIG. 16 is a flowchart showing an outline of the processing procedure of the switch control processing (S2) of FIG. If it is determined in the failure detection process (S1 = S2a) that a failure has been detected, an abnormal signal serving as an instruction to open the changeover switch 6 is output to the control device 8 (S2b). As a result, the control device 8 opens the changeover switch 6. If it is determined in the failure detection process (S1 = S2a) that the failure has not been detected, a signal that is a closing instruction of the changeover switch 6 (in this case, closed) is output to the control device 8 (or the current state is maintained). Therefore, no signal is output) (S2c).

  As described above, when overheating of the voltage conversion device 5 is detected by the overheat detection device 37, the changeover switch 6 is opened from the overheat detection device 37 to the control device 8, and the voltage conversion device 5 and the capacitor are opened. 4 is disconnected from the power line SL, so that the failure of the voltage converter 5 due to overheating and the unnecessary flow of electric power from the lithium ion battery 3 to the capacitor 4 can be prevented, resulting in a decrease in power performance and a cruising range. It is possible to suppress the shortening of the electric load, and to prevent the functional deterioration and malfunction of the electric load.

Embodiment 5 FIG.
FIG. 17 is a diagram showing a configuration of a vehicle drive power supply device according to Embodiment 5 of the present invention. In this embodiment, as an abnormality detection means, an open failure detection device 47 that detects the open failure by detecting the voltages of the positive electrode and the negative electrode of the capacitor 4 by, for example, the voltage detector V is provided.

  Next, the operation will be described. FIG. 18 is a flowchart showing an outline of the processing procedure of the open fault detection device 47 in this embodiment. In the failure detection process (S1), the failure of the capacitor 4 (positive and negative electrode open failure) is detected. Based on the result, the switch control instruction to the control device 8 is determined in the switch control process (S2).

  FIG. 19 is a flowchart showing an outline of the processing procedure of the failure detection processing (S1) of FIG. In this embodiment, a case where an open failure of the positive electrode and the negative electrode of the capacitor 4 is detected is shown. The positive side voltage Vp and the negative side voltage Vm of the capacitor 4 are compared with a predetermined threshold value Vth (S1a). If at least one of the positive side voltage Vp and the negative side voltage Vm is less than the threshold value Vth, Assuming that an open failure has occurred, a failure detection state is set (S1b). When both the positive side voltage Vp and the negative side voltage Vm are equal to or higher than the threshold value Vth, the capacitor 4 is assumed to be operating normally, and is set to a failure undetected state (S1c). In this embodiment, the open circuit failure is detected from the positive side voltage and the negative side voltage of the capacitor 4 and a predetermined threshold. However, the means to be used is not limited to this, and other means may be used. Absent.

  After the failure detection process, the process proceeds to the switch control process. FIG. 20 is a flowchart showing an outline of the processing procedure of the switch control processing (S2) of FIG. If it is determined in the failure detection process (S1 = S2a) that a failure has been detected, an abnormal signal serving as an instruction to open the changeover switch 6 is output to the control device 8 (S2b). As a result, the control device 8 opens the changeover switch 6. If it is determined in the failure detection process (S1 = S2a) that the failure has not been detected, a signal that is a closing instruction of the changeover switch 6 (in this case, closed) is output to the control device 8 (or the current state is maintained). Therefore, no signal is output) (S2c).

  As described above, when the open failure detection device 47 detects an open failure of the positive electrode or the negative electrode of the capacitor 4, the open failure detection device 47 sets the changeover switch 6 to the open state to the control device 8, and the voltage is set. Since the conversion device 5 and the capacitor 4 are instructed to be disconnected from the power line SL, the flow of power from the lithium ion battery 3 is prevented when the capacitor 4 cannot be charged / discharged, and the power of the lithium ion battery 3 is consumed unnecessarily. This can prevent the cruising range from being shortened. In addition, it is possible to prevent a reduction in performance or malfunction of the electric load of the vehicle due to unnecessary power consumption of the lithium ion battery 3.

Embodiment 6 FIG.
FIG. 21 is a diagram showing a configuration of a vehicle drive power supply device according to Embodiment 6 of the present invention. In this embodiment, as an abnormality detection means, as in the fifth embodiment, an open failure detection device 47 that detects the open failure by detecting the positive and negative voltages of the capacitor 4 by, for example, the voltage detector V, is provided. However, the changeover switch 6 is not provided, and the semiconductor switch 5a of the voltage conversion device 5 is connected to the power supply line SL. The control device 8 performs open / close control of the semiconductor switch 5a.

  Next, the operation will be described. FIG. 22 is a flowchart showing an outline of the processing procedure of the open fault detection apparatus 47 in this embodiment, and FIGS. 23 and 24 show the outline of the processing procedure of the fault detection process (S1) and the switch control process (S2) of FIG. It is a flowchart which shows. The operation is basically the same as that of the fifth embodiment except that the control device 8 performs open / close control of the semiconductor switch 5a of the voltage conversion device 5 instead of the changeover switch 6.

  In this manner, in addition to the fifth embodiment, the changeover switch 6 is used to separate the voltage conversion device 5 and the capacitor 4 from the power supply line SL using the semiconductor switch 5a included in the voltage conversion device 5. It is not necessary to add countermeasure configurations such as relays and relays, and cost reduction and space saving can be achieved.

Embodiment 7 FIG.
FIG. 25 is a diagram showing a configuration of a vehicle drive power supply device according to Embodiment 7 of the present invention. In this embodiment, a short-circuit fault detection device 57 that detects the short-circuit fault by detecting the positive and negative voltages of the capacitor 4 by, for example, the voltage detector V is provided as an abnormality detection means.

  Next, the operation will be described. FIG. 26 is a flowchart showing an outline of the processing procedure of the short-circuit fault detection device 57 in this embodiment. In the failure detection process (S1), a failure of the capacitor 4 (short-circuit failure between the positive electrode and the negative electrode) is detected. Based on the result, a switch control instruction to the control device 8 is determined in the switch control process (S2).

  FIG. 27 is a flowchart showing an outline of the processing procedure of the failure detection processing (S1) of FIG. In this embodiment, a case where a short-circuit fault of the capacitor 4 is detected is shown. The positive side voltage Vp and the negative side voltage Vm of the capacitor 4 are compared (S1a), and if they match, it is determined that a short circuit fault has occurred in the capacitor 4 and a fault detection state is set (S1b). When the positive side voltage Vp and the negative side voltage Vm do not match, it is determined that the capacitor is operating normally and is set to a failure undetected state (S1c). In this embodiment, the short-circuit failure is detected from the positive side voltage and the negative side voltage of the capacitor 4, but the means to be used is not limited to this, and other means may be used.

  After the failure detection process, the process proceeds to the switch control process. FIG. 28 is a flowchart showing an outline of the procedure of the switch control process (S2) of FIG. If it is determined in the failure detection process (S1 = S2a) that a failure has been detected, an abnormal signal serving as an instruction to open the changeover switch 6 is output to the control device 8 (S2b). As a result, the control device 8 opens the changeover switch 6. If it is determined in the failure detection process (S1 = S2a) that the failure has not been detected, a signal that is a closing instruction of the changeover switch 6 (in this case, closed) is output to the control device 8 (or the current state is maintained). Therefore, no signal is output) (S2c).

  As described above, when the short-circuit fault detection device 57 detects a short-circuit failure of the capacitor 4, the switch 6 is opened from the short-circuit fault detection device 57 to the control device 8. Since the capacitor 4 is instructed to be disconnected from the power line SL, it is possible to prevent the lithium ion battery 3, the voltage conversion device 5, and the capacitor 4 that are the power supply system of the vehicle from being short-circuited, and the motor 1 that is the drive system of the vehicle. In addition, it is possible to prevent a situation in which the inverter 2 or the electric load has an effect such as a deterioration in function or malfunction.

Embodiment 8 FIG.
FIG. 25 is a diagram showing the configuration of a vehicle drive power supply device according to Embodiment 8 of the present invention. In this embodiment, a short-circuit fault detection device 57 that detects the short-circuit fault by detecting the voltages of the positive electrode and the negative electrode of the capacitor 4 by, for example, the voltage detector V, as in the seventh embodiment, is provided as the abnormality detection means. However, the changeover switch 6 is not provided, and the semiconductor switch 5a of the voltage conversion device 5 is connected to the power supply line SL. The control device 8 performs open / close control of the semiconductor switch 5a.

  Next, the operation will be described. FIG. 30 is a flowchart showing an outline of the processing procedure of the short-circuit fault detection device 57 in this embodiment, and FIGS. 31 and 32 show the outline of the processing procedure of the fault detection process (S1) and the switch control process (S2) in FIG. 30, respectively. It is a flowchart which shows. The operation is basically the same as that of the seventh embodiment except that the control device 8 performs open / close control of the semiconductor switch 5a of the voltage conversion device 5 instead of the changeover switch 6.

  As described above, in addition to the seventh embodiment, the changeover switch 6 is used to separate the voltage conversion device 5 and the capacitor 4 from the power supply line SL using the semiconductor switch 5a included in the voltage conversion device 5. It is not necessary to add countermeasure configurations such as relays and relays, and cost reduction and space saving can be achieved.

Embodiment 9 FIG.
FIG. 25 is a diagram showing a configuration of a vehicle drive power supply device according to Embodiment 7 of the present invention. In this embodiment, a ground fault detection device 67 for detecting a positive ground fault by detecting the voltage of the positive pole of the capacitor 4 using, for example, the voltage detector V is provided as an abnormality detecting means.

  Next, the operation will be described. FIG. 34 is a flowchart showing an outline of the processing procedure of the ground fault detection device 67 in this embodiment. A failure of the capacitor 4 (positive ground fault) is detected in the failure detection process (S1), and a changeover switch control instruction to the control device 8 is determined in the switch control process (S2) based on the result.

  FIG. 35 is a flowchart showing an outline of the processing procedure of the failure detection processing (S1) of FIG. In this embodiment, the case where the ground fault of the positive electrode of the capacitor 4 is detected is shown. When the positive side voltage Vp (S1a) of the capacitor 4 is 0V, it is determined that a ground fault has occurred in the capacitor 4, and a failure detection state is set (S1b). If the positive side voltage Vp is not 0V, the capacitor 4 is assumed to be operating normally and is set to a failure undetected state (S1c). In this embodiment, the ground fault is detected from the positive side voltage of the capacitor 4. However, the means used is not limited to this, and other means may be used.

  After the failure detection process, the process proceeds to the switch control process. FIG. 36 is a flowchart showing an outline of the processing procedure of the switch control processing (S2) of FIG. If it is determined in the failure detection process (S1 = S2a) that a failure has been detected, an abnormal signal serving as an instruction to open the changeover switch 6 is output to the control device 8 (S2b). As a result, the control device 8 opens the changeover switch 6. If it is determined in the failure detection process (S1 = S2a) that the failure has not been detected, a signal that is a closing instruction of the changeover switch 6 (in this case, closed) is output to the control device 8 (or the current state is maintained). Therefore, no signal is output) (S2c)

  With the above configuration, when the ground fault detection device 67 detects a ground fault in the positive electrode of the capacitor 4, the changeover switch 6 is opened from the ground fault detection device 67 to the control device 8. Since the voltage conversion device 5 and the capacitor 4 are instructed to be separated from the power supply line SL, it is possible to prevent the lithium ion battery 3, the voltage conversion device 5, and the capacitor 4 that are the power supply system of the vehicle from being short-circuited. It is possible to prevent a situation in which the motor 1, the inverter 2, or the electric load that is the drive system has an effect such as reduced function or inoperative.

Embodiment 10 FIG.
FIG. 37 is a diagram showing a configuration of a vehicle drive power supply apparatus according to Embodiment 10 of the present invention. In this embodiment, a ground fault detection device 67 for detecting a positive ground fault by detecting the voltage of the positive pole of the capacitor 4 by, for example, the voltage detector V is provided as an abnormality detecting means, as in the ninth embodiment. . However, the changeover switch 6 is not provided, and the semiconductor switch 5a of the voltage conversion device 5 is connected to the power supply line SL. The control device 8 performs open / close control of the semiconductor switch 5a.

  Next, the operation will be described. FIG. 38 is a flowchart showing an outline of the processing procedure of the ground fault detection device 67 in this embodiment, and FIGS. 39 and 40 show the processing procedure of the fault detection processing (S1) and switch control processing (S2) in FIG. 38, respectively. It is a flowchart which shows an outline. The operation is basically the same as that of the ninth embodiment except that the control device 8 performs open / close control of the semiconductor switch 5a of the voltage conversion device 5 instead of the changeover switch 6.

  In this manner, in addition to the ninth embodiment, the changeover switch 6 is used to separate the voltage conversion device 5 and the capacitor 4 from the power supply line SL using the semiconductor switch 5a included in the voltage conversion device 5. It is not necessary to add countermeasure configurations such as relays and relays, and cost reduction and space saving can be achieved.

  The present invention is not limited to the above-described embodiments, and it goes without saying that all possible combinations thereof are included.

  For example, the input / output short-circuit detection device 7 according to the first embodiment, the output overvoltage detection device 17 according to the second embodiment, the output overcurrent detection device 27 according to the third embodiment, the overheat detection device 37 according to the fourth embodiment, and the embodiment. 5 open fault detector 47, short-circuit fault detector 57 according to the seventh embodiment, and ground fault detector 67 according to the ninth embodiment. The changeover switch 6 may be opened at the time of detection. Further, an open fault detection device 47 according to the sixth embodiment, a short circuit fault detection device 57 according to the eighth embodiment, and a ground fault detection device 67 according to the tenth embodiment are provided, and each controller 8 receives each abnormal signal. When any abnormality is detected, the semiconductor switch in the voltage converter 5 may be opened.

  DESCRIPTION OF SYMBOLS 1 Motor (rotary electric machine), 2 Inverter, 3 Lithium ion battery (1st power supply device), 4 Capacitor (2nd power supply device), 5 Voltage converter, 5a, 5b Semiconductor switch, 5c Inductor, 6 Changeover switch ( 7) Input / output short-circuit detection device (abnormality detection means), 8 control device, 17 output overvoltage detection device (abnormality detection means), 27 output overcurrent detection device (abnormality detection means), 37 overheat detection device (abnormality detection) Means), 47 open fault detection device (abnormality detection means), 57 short circuit fault detection device (abnormality detection means), 67 ground fault detection device (abnormality detection means), A current detector, SL power line, t temperature sensor, V Voltage detector.

Claims (4)

A first power supply that supplies power stored in the rotating electrical machine via an inverter to and from the rotating electrical machine that drives the vehicle, and that receives regenerative power from the rotating electrical machine;
A second power supply device for storing power capable of being charged and discharged more rapidly than the first power supply device;
The voltage of the second power supply device is connected between the power supply line connecting the first power supply device and the inverter and the second power supply device, and supplies driving power to the rotating electrical machine via the inverter. A voltage conversion device for converting
An abnormality detection means for detecting an internal abnormality of the voltage conversion device or the second power supply device and generating an abnormality signal;
Opening and closing means for connecting and disconnecting between the voltage converter and the power supply line,
A control device that opens the opening and closing means when receiving an abnormality signal from the abnormality detection means, and separates the voltage conversion device and the second power supply device from the power supply line;
A vehicle drive power supply device comprising:   The abnormality detection means includes a short circuit between input and output due to an internal failure of the voltage conversion device, an output overvoltage, an output overcurrent, an overheat, and an open failure of the positive electrode or the negative electrode of the second power supply device, a short circuit between the positive electrode and the negative electrode. Detecting at least one of a failure and a ground fault of a positive electrode, and the control device opens a change-over switch inserted between the voltage conversion device and a power line constituting the switching means, The vehicle drive power supply device according to claim 1.   The abnormality detection means detects at least one of an open failure, a short-circuit failure, and a ground fault of the positive or negative electrode of the second power supply device, and the control device forms the voltage conversion that constitutes the switching means. 2. The vehicle drive power supply device according to claim 1, wherein a semiconductor switch in the voltage conversion device that connects and disconnects the device and the power supply line is opened.   The first power supply device is a lithium ion battery, the second power supply device is a capacitor, and the rotating electrical machine is a permanent magnet AC synchronous motor. 2. A vehicle drive power supply device according to item 1.

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