JP2016129460A - Power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promptly identify the cause of an abnormality produced when charging a capacitor.SOLUTION: When the occurrence of a power consumption abnormality is determined, if a voltage VH of a first capacitor is larger than a battery voltage VB of a battery, it is determined that the power consumption abnormality is caused by the drive of a step-up converter (steps S110, S120). If the voltage VH is the battery voltage VB or lower and a difference obtained by subtracting the voltage VL of the second capacitor from the voltage VH of the first capacitor is larger than a threshold Vth1, when an auxiliary equipment voltage VA is larger than a threshold Vth2, it is determined that the power consumption abnormality is caused by the drive of a DC/DC converter (steps S130-S150), whereas when an auxiliary equipment voltage VA is a threshold Vth2 or lower, it is determined that the power consumption abnormality is caused on the battery side at the drive of the DC/DC converter (steps S130, S140, S160).SELECTED DRAWING: Figure 3

Description

  The present invention relates to a power supply device, and more particularly, converts a voltage of a battery, a boost converter capable of boosting power from the battery and supplying the boosted power to a first load, and a first power bus connecting the battery and the boost converter. A DC / DC converter for supplying to the second load, a first capacitor connected to the first power bus, and a second capacitor connected to the second power bus between the boost converter and the first load. The present invention relates to a power supply device provided.

  Conventionally, as this type of power supply device, a device including a battery, a motor, an inverter, and a plurality of high-voltage components has been proposed (for example, see Patent Document 1). The inverter incorporates an electrolytic capacitor, converts DC power from the battery into AC power, and supplies it to the motor. The high voltage component is connected between the battery and the inverter, and operates with electric power from the battery. In this power supply device, when the measured value of the accumulated power consumption of the battery during the precharging of the electrolytic capacitor exceeds a predetermined reference value, one of the high voltage compotes to be stopped at the time of precharging is driven. Thus, it is determined that the precharge failure has occurred so that the battery power is consumed and precharge cannot be performed. When it is determined that the precharge failure has occurred, one of the plurality of high-voltage components is sequentially allowed to perform precharge again, and the accumulated power consumption inspection value obtained here is obtained. Is compared with the actual measurement value obtained earlier, and the high-voltage component for which the inspection value closest to the actual measurement value is measured is identified as the high-voltage component causing the precharge failure.

JP 2006-174522 A

  In the above-described power supply apparatus, it is necessary to sequentially drive a plurality of high-voltage components in order to identify the cause of the abnormality occurring when charging the capacitor. Therefore, it takes time to identify the cause of the abnormality.

  The main purpose of the power supply device of the present invention is to identify the cause of abnormality occurring when charging a capacitor more quickly.

  The power supply apparatus of the present invention employs the following means in order to achieve the main object described above.

The power supply device of the present invention is
Battery,
A reactor, two switching elements constituting an upper arm and a lower arm, and two diodes connected in parallel to the two switching elements in the reverse direction, and boosting the power from the battery to increase the first A boost converter capable of supplying a load;
A DC / DC converter that converts a voltage of a first power bus connecting the battery and the boost converter and supplies the converted voltage to a second load;
A first capacitor connected to the first power bus;
A second capacitor connected to a second power bus between the boost converter and the first load;
A precharge circuit for supplying power from the battery to the first capacitor and the second capacitor;
The two switching elements of the boost converter are turned off to stop driving the boost converter, and also stop driving the DC / DC converter and use the power from the battery via the precharge circuit to stop the first converter. Precharge execution means for performing precharge for charging the capacitor and the second capacitor;
A power supply device comprising:
In the case where the precharge is executed, when the voltage of the second capacitor is larger than the voltage between the terminals of the battery, first determination means for determining that an abnormality has occurred due to driving of the boost converter;
When the precharge is executed, a voltage obtained by subtracting the voltage of the first capacitor from the voltage of the second capacitor is equal to or less than a first predetermined value when the voltage of the second capacitor is equal to or lower than the voltage between the terminals of the battery. A second determination means for determining that an abnormality has occurred on the battery side from the step-up converter when larger,
When it is determined by the second determination means that an abnormality has occurred on the battery side from the boost converter, when the voltage of the second load is greater than a second predetermined value, an abnormality caused by driving of the DC / DC converter Third determination means for determining that occurrence has occurred;
It is a summary to provide.

  In the power supply device of the present invention, the two switching elements of the boost converter are turned off to stop the drive of the boost converter, and the drive of the DC / DC converter is stopped, and the power from the battery is supplied via the precharge circuit. A precharge is performed to charge the first capacitor and the second capacitor. When precharge is executed, if the voltage of the second capacitor is larger than the voltage across the terminals of the battery, it is determined that an abnormality has occurred due to the drive of the boost converter. In addition, when the precharge is executed, the voltage of the second capacitor is equal to or lower than the voltage between the terminals of the battery, and the difference obtained by subtracting the voltage of the first capacitor from the voltage of the second capacitor is greater than the first predetermined value. It is determined that an abnormality has occurred on the battery side from the boost converter. If it is determined that an abnormality has occurred on the battery side from the boost converter, and if the voltage of the second load is greater than the second predetermined value, it is determined that an abnormality has occurred due to driving of the DC / DC converter. . Thereby, compared with what drives a boost converter and a DC / DC converter sequentially, the cause which abnormality has arisen can be pinpointed more rapidly. Here, examples of the “first predetermined value” include a value capable of determining that the voltage of the first capacitor is lower than the voltage of the second capacitor. Further, examples of the “second predetermined value” include an open circuit voltage of the auxiliary machine.

  In such a power supply device of the present invention, the determination by the first determination unit and the second determination unit is executed when it is determined that an abnormality has occurred in which current continuously flows from the battery during the precharge. It can also be. In the precharge, the first and second capacitors are charged and the current from the battery gradually decreases. Therefore, when the current continues to flow from the battery during the precharge, the power from the battery is the first. The second capacitor is considered to be consumed at a different location. Therefore, when it is determined that an abnormality has occurred in which the current continuously flows from the battery during precharge, the determination by the first determination unit and the second determination unit is performed, thereby suppressing unnecessary determination. can do.

It is a block diagram which shows the outline of a structure of the hybrid vehicle 20 provided with the power supply device as one Example of this invention. It is a block diagram which shows the outline of a structure of the electric drive system containing motor MG1, MG2. It is a flowchart which shows an example of the abnormality cause determination routine performed by HVECU70 of an Example. It is explanatory drawing explaining the aged characteristic of the open circuit voltage OCV of the auxiliary machine 61, and the closed circuit voltage CCV.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of the configuration of a hybrid vehicle 20 including a power supply device as one embodiment of the present invention, and FIG. 2 is a configuration showing an outline of the configuration of an electric drive system including motors MG1 and MG2. FIG. As shown in FIG. 1, the hybrid vehicle 20 of the embodiment includes an engine 22, a planetary gear 30, motors MG1 and MG2, inverters 41 and 42, a boost converter 55, a high voltage battery 50, and a system main relay 56. A low voltage battery 60, a DC / DC converter 62, and a hybrid electronic control unit (hereinafter referred to as HVECU) 70.

  The engine 22 is configured as an internal combustion engine that outputs power using gasoline or light oil as a fuel. Operation of the engine 22 is controlled by an engine electronic control unit (hereinafter referred to as engine ECU) 24.

  Although not shown, the engine ECU 24 is configured as a microprocessor centered on a CPU, and includes a ROM for storing a processing program, a RAM for temporarily storing data, an input / output port, and a communication port in addition to the CPU. . Signals from various sensors necessary for controlling the operation of the engine 22 are input to the engine ECU 24 via an input port. Examples of signals from various sensors include the following. Crank angle θcr from a crank position sensor that detects the rotational position of the crankshaft 26. Various control signals for controlling the operation of the engine 22 are output from the engine ECU 24 through an output port. The engine ECU 24 is connected to the HVECU 70 via a communication port, controls the operation of the engine 22 by a control signal from the HVECU 70, and outputs data related to the operating state of the engine 22 to the HVECU 70 as necessary. The engine ECU 24 calculates the rotational speed of the crankshaft 26, that is, the rotational speed Ne of the engine 22, based on the crank angle θcr from the crank position sensor.

  The planetary gear 30 is configured as a single pinion type planetary gear mechanism. The sun gear, the ring gear, and the carrier of the planetary gear 30 are connected to the rotor of the motor MG1, the drive shaft 36 coupled to the drive wheels 38a and 38b via the differential gear 37, and the crankshaft 26 of the engine 22, respectively.

  The motor MG1 is configured as a synchronous generator motor having a rotor in which a permanent magnet is embedded and a stator in which a three-phase coil is wound, and the rotor is connected to the sun gear of the planetary gear 30 as described above. Yes. The motor MG2 is configured as a synchronous generator motor similar to the motor MG1, and the rotor is connected to the drive shaft 36.

  As shown in FIG. 2, the inverter 41 is connected to the drive voltage system power line 54a. The inverter 41 includes six transistors T11 to T16 and six diodes D11 to D16 connected in parallel to the transistors T11 to T16 in the reverse direction. Two transistors T11 to T16 are arranged in pairs so as to be on the source side and the sink side with respect to the positive and negative buses of the drive voltage system power line 54a, respectively. In the transistors T11 to T16, each of the three-phase coils (U-phase, V-phase, W-phase) of the motor MG1 is connected to each connection point between the paired transistors. Therefore, when a voltage is applied to the inverter 41, the motor electronic control unit (hereinafter referred to as a motor ECU) 40 adjusts the ratio of the on-time of the paired transistors T11 to T16, so that three-phase A rotating magnetic field is formed in the coil, and the motor MG1 is driven to rotate. Similarly to the inverter 41, the inverter 42 includes six transistors T21 to T26 and six diodes D21 to D26. When the voltage is applied to the inverter 42, the motor ECU 40 adjusts the ratio of the on-time of the paired transistors T21 to T26, whereby a rotating magnetic field is formed in the three-phase coil, and the motor MG2 is Driven by rotation.

  As shown in FIG. 2, boost converter 55 is connected to drive voltage system power line 54 a to which inverters 41 and 42 are connected, and to battery voltage system power line 54 b to which high voltage battery 50 is connected. This step-up converter 55 includes two transistors T31 and T32, two diodes D31 and D32 connected in parallel to the transistors T31 and T32 in the reverse direction, and a reactor L. The transistor T31 is connected to the positive bus of the drive voltage system power line 54a. The transistor T32 is connected to the transistor T31 and the negative bus of the drive voltage system power line 54a and the battery voltage system power line 54b. Reactor L is connected to a connection point between transistors T31 and T32 and a positive electrode bus of battery voltage system power line 54b. The boost converter 55 boosts the power of the battery voltage system power line 54b and supplies it to the drive voltage system power line 54a by turning on and off the transistors T31 and T32 by the motor ECU 40, or the power of the drive voltage system power line 54a. Or the voltage is supplied to the battery voltage power line 54b. A smoothing capacitor 57 is attached to the positive electrode side line and the negative electrode side line of the drive voltage system power line 54a, and a smoothing capacitor 57 is attached to the positive electrode side line and the negative electrode side line of the battery voltage system power line 54b. A capacitor 58 is attached. Further, a discharge resistor 59 is attached to the positive electrode side line and the negative electrode side line of the drive voltage system power line 54a.

  Although not shown, the motor ECU 40 is configured as a microprocessor centered on a CPU, and includes a ROM for storing a processing program, a RAM for temporarily storing data, an input / output port, and a communication port in addition to the CPU. . As shown in FIG. 1, signals from various sensors necessary for driving and controlling the motors MG1 and MG2 and the boost converter 55 are input to the motor ECU 40 through the input port. Examples of signals from various sensors include the following. Rotation positions θm1 and θm2 from a rotation position detection sensor that detects the rotation positions of the rotors of the motors MG1 and MG2. Phase current from a current sensor that detects current flowing in each phase of motors MG1 and MG2. The voltage of the capacitor 57 (voltage of the drive voltage system power line 54a) VH from the voltage sensor 57a attached between the terminals of the capacitor 57. Voltage of the capacitor 58 (voltage of the battery voltage system power line 54b) VL from the voltage sensor 58a attached between the terminals of the capacitor 58. Various control signals necessary for driving and controlling the motors MG1 and MG2 and the boost converter 55 are output from the motor ECU 40 through the output port. Examples of the various control signals include the following. Switching control signals to the transistors T11 to T16 and T21 to T26 of the inverters 41 and 42. Switching control signal to transistors T31 and T32 of boost converter 55. The motor ECU 40 is connected to the HVECU 70 via a communication port. The motor ECU 40 controls driving of the motors MG1, MG2 and the boost converter 55 by a control signal from the HVECU 70 and drives the motors MG1, MG2 and the boost converter 55 as necessary. Is output to the HVECU 70. The motor ECU 40 calculates the rotational speeds Nm1 and Nm2 of the motors MG1 and MG2 based on the rotational positions θm1 and θm2 of the rotors of the motors MG1 and MG2 from the rotational position detection sensor.

  The high voltage battery 50 is configured as, for example, a lithium ion secondary battery or nickel hydride secondary battery of 200V or 250V, and is connected to the battery voltage system power line 54b as described above. The high voltage battery 50 is managed by a battery electronic control unit (hereinafter referred to as a battery ECU) 52.

  Although not shown, the battery ECU 52 is configured as a microprocessor centered on a CPU, and includes a ROM for storing a processing program, a RAM for temporarily storing data, an input / output port, and a communication port in addition to the CPU. . Various signals necessary for managing the high voltage battery 50 are input to the battery ECU 52 via the input port. Examples of various signals include the following. The battery voltage Vb from the voltage sensor 51 installed between the terminals of the high voltage battery 50. The battery current Ib from the current sensor attached to the power line connected to the output terminal of the high voltage battery 50. Battery temperature Tb from a temperature sensor attached to the high voltage battery 50. The battery ECU 52 is connected to the HVECU 70 via a communication port, and outputs data relating to the state of the high voltage battery 50 to the HVECU 70 as necessary. The battery ECU 52 is a ratio of the capacity of electric power that can be discharged from the high-voltage battery 50 at that time based on the integrated value of the battery current Ib detected by the current sensor in order to manage the high-voltage battery 50. Input / output limits Win and Wout, which are maximum allowable powers that may charge / discharge the high-voltage battery 50 based on the calculated storage ratio SOC or based on the calculated storage ratio SOC and the battery temperature Tb detected by the temperature sensor. It is calculating.

  As shown in FIG. 2, the system main relay 56 is provided closer to the high voltage battery 50 than the capacitor 58 of the battery voltage system power line 54b. This system main relay 56 includes a positive side relay SMRB provided on the positive side line of the battery voltage system power line 54b, a negative side relay SMRG provided on the negative side line of the battery voltage system power line 54b, and a negative side relay. A precharging resistor R and a precharging relay SMRP connected in series so as to bypass the SMRG. The system main relay 56 is turned on and off by the HVECU 70.

  The low voltage battery 60 is configured as, for example, a 12V lead storage battery, and is connected to an electric power line (hereinafter referred to as a low voltage power line) 54c together with the auxiliary machine 61 and the like. The DC / DC converter 62 is connected from the system main relay 56 of the battery voltage system power line 54b to the boost converter 55 side and the low voltage system power line 54c. This DC / DC converter 62 is controlled by the HVECU 70 to step down the power of the battery voltage system power line 54b and supply it to the low voltage system power line 54c, or boost the power of the low voltage system power line 54c. Or supplied to the battery voltage system power line 54b.

  Although not shown, the HVECU 70 is configured as a microprocessor centered on a CPU, and includes a ROM for storing a processing program, a RAM for temporarily storing data, an input / output port, and a communication port in addition to the CPU. The HVECU 70 receives signals from various sensors. Examples of signals from various sensors include the following. The auxiliary machine voltage VA from the voltage sensor 61a that detects the voltage between the terminals of the auxiliary machine 61. An ignition signal from the ignition switch 80. A shift position SP from the shift position sensor 82 that detects the operation position of the shift lever 81. Accelerator opening degree Acc from the accelerator pedal position sensor 84 that detects the depression amount of the accelerator pedal 83. The brake pedal position BP from the brake pedal position sensor 86 that detects the amount of depression of the brake pedal 85. Vehicle speed V from the vehicle speed sensor 88. Various control signals are output from the HVECU 70 via an output port. Examples of the various control signals include the following. ON / OFF control signal to the system main relay 56. Auxiliary machine control signal for driving and controlling the auxiliary machine 61. As described above, the HVECU 70 is connected to the engine ECU 24, the motor ECU 40, and the battery ECU 52 via the communication port, and exchanges various control signals and data with the engine ECU 24, the motor ECU 40, and the battery ECU 52.

  The thus configured hybrid vehicle 20 of the embodiment travels in a hybrid travel mode (HV travel) that travels with the operation of the engine 22 or in an electric travel mode (EV travel) that travels while the operation of the engine 22 is stopped.

  In the hybrid vehicle 20, when a system activation instruction is issued, the positive side relay SMRB and the precharge relay SMRP of the system main relay 56 are turned on and the negative side relay SMRG is turned off. Precharge for charging 58 is performed. In the precharge, the transistors T31 and T32 of the boost converter 55 are turned off (the drive of the boost converter 55 is stopped), and the difference between the voltage VL of the capacitor 58 and the battery voltage Vb of the high voltage battery 50 is a predetermined voltage difference Vdref. The voltages VH and VL of the capacitors 57 and 58 are increased until Thereby, it is possible to charge the capacitors 57 and 58 while suppressing a large current from flowing through the positive side relay SMRB. Here, the predetermined voltage difference Vdref is a voltage difference allowed between the positive side relay SMRB and the negative side relay SMRG when the positive side relay SMRB and the negative side relay SMRG are turned on (voltage difference at which each relay does not weld). A predetermined one (for example, 0V, 50V, 100V, etc.) is used. When the voltage difference between the voltage VL of the capacitor 58 and the battery voltage Vb of the high voltage battery 50 reaches a predetermined voltage difference Vdref, the negative side relay SMRG is turned on and the precharge relay SMRP is turned off. Accordingly, the positive relay SMRB and the negative relay SMRG are turned on while suppressing a large current from flowing through the positive relay SMRB and the negative relay SMRG. Thus, after the positive side relay SMRB and the negative side relay SMRG are turned on, the system is started and the vehicle travels in the HV traveling mode or the EV traveling mode.

  In the hybrid vehicle 20, when the precharge is normally executed, the battery current Ib of the high voltage battery 50 gradually decreases as the voltages VH and VL of the capacitors 57 and 58 increase. Therefore, when a battery current Ib of a predetermined value (for example, 4A, 5A, 6A, etc.) or more continuously flows during precharge, the power from the high voltage battery 50 is charged to the capacitors 57, 58. Determines that an abnormal power consumption occurs due to a different cause. This power consumption abnormality is considered to be caused by a minute short circuit in any part of the electric drive system or driving of a load to be stopped during precharging such as the boost converter 55 and the DC / DC converter 62.

  Next, the operation of the hybrid vehicle 20 of the embodiment configured as described above, particularly the operation when specifying the cause of the power consumption abnormality will be described. FIG. 3 is a flowchart illustrating an example of an abnormality cause determination routine executed by the HVECU 70 of the embodiment. This routine is executed when it is determined that the above-described power consumption abnormality has occurred during precharging.

  When this routine is executed, the HVECU 70 determines the voltage VH of the capacitor 57, the voltage VL of the capacitor 58, the battery voltage VB of the high-voltage battery 50, the auxiliary machine voltage VA, etc. when it is determined that an abnormality in power consumption has occurred. Processing for inputting data necessary for execution of this routine is executed (step S100). The voltages VH and VL detected by the voltage sensors 57a and 58a are input from the motor ECU 40 by communication. The battery voltage VB detected by the voltage sensor 51 is input from the battery ECU 52 by communication.

  Subsequently, the voltage VH of the capacitor 57 is compared with the battery voltage VB (step S110). When the boost converter 55 to be stopped during precharge is driven to perform a boost operation, the voltage VH of the capacitor 57 becomes higher than the battery voltage VB. Therefore, the process of step S110 is a process of determining whether or not the boost converter 55 that should be stopped during precharge is driven.

  When the voltage VH is higher than the battery voltage VB (step S110), it is determined that the cause of the power consumption abnormality is that the boost converter 55 to be stopped during the precharge is driven for some reason (step S120). Exit. Thereby, it is possible to specify that the cause of the power consumption abnormality is due to driving of boost converter 55.

  When voltage VH is equal to or lower than battery voltage VB (step S110), it is determined that boost converter 55 has stopped driving during precharge, and subsequently, difference ΔV obtained by subtracting voltage VL from voltage VH and threshold value Vth1 (for example, , 9.0V, 10V, 11V, etc.) (step S130). Here, as the threshold value Vth1, a predetermined threshold value is used as a threshold value for determining whether or not power is consumed on the high voltage battery 50 side from the boost converter 55 during the precharge. Here, since it is determined that the boost converter 55 has stopped driving during precharge, the cause of the power consumption abnormality is either on the high voltage battery 50 side from the boost converter 55 or on the capacitor 57 side from the boost converter 55. It is believed that there is. When power is consumed on the high voltage battery 50 side from the boost converter 55, the voltage VL is reduced by the precharging resistor R. Therefore, the processing in step S130 consumes power on the high voltage battery 50 side from the boost converter 55. It is a process for determining whether or not.

  When the difference ΔV is higher than the threshold value Vth1 (step S130), it is determined that the cause of the power consumption abnormality is that power is consumed on the high voltage battery 50 side from the boost converter 55, and then the auxiliary voltage VA is The threshold value Vth2 is compared (step S140). Here, as the threshold value Vth2, a predetermined value is used as the initial open circuit voltage OCV of the auxiliary machine 61 (immediately after shipment). FIG. 4 is an explanatory diagram for explaining the aging characteristics of the open circuit voltage OCV and the closed circuit voltage CCV of the auxiliary machine 61. In the figure, the solid line indicates the time change of the closed circuit voltage CCV over time, and the broken line indicates the time change of the open circuit voltage OCV. As shown in the figure, the closed circuit voltage CCV is lower than the open circuit voltage OCV in the initial stage (immediately after shipment), and thereafter, the value thereof decreases as the internal resistance increases with the passage of time. Therefore, the closed circuit voltage CCV is always lower than the initial (immediately after shipment) open circuit voltage OCV, that is, the threshold value Vth2. When the DC / DC converter 62 is stopped, the auxiliary machine voltage VA becomes the closed circuit voltage CCV, which is smaller than the threshold value Vth2. That is, when the auxiliary machine voltage VA exceeds the threshold value Vth2, the DC / DC converter 62 is driven during precharge. Therefore, the process of step S140 is a process of determining whether or not the DC / DC converter 62 is driven during the precharge.

  When the auxiliary machine voltage VA is higher than the threshold value Vht2 (step S140), it is determined that the cause of the power consumption abnormality is that the DC / DC converter 62 to be stopped for some reason during the precharge is driven (step S140). S150), this routine is finished. Thereby, it is possible to specify that the cause of the power consumption abnormality is due to the driving of the DC / DC converter 62.

  If auxiliary voltage VA is equal to or lower than threshold value Vht2 (step S140), it is determined that driving of DC / DC converter 62 has been stopped during precharging, and the cause of power consumption abnormality is higher than that of boost converter 55. On the 50th side, it is determined that a component different from the DC / DC converter 62 has been driven or a slight short circuit has occurred (step S160), and this routine is terminated. Thereby, it is possible to specify that the cause of the power consumption abnormality is in a component on the high voltage battery 50 side of the boost converter 55 other than the drive of the DC / DC converter 62.

  When the difference ΔV is equal to or less than the threshold value Vth1 (step S130), it is determined that the cause of the power consumption abnormality is that a component on the capacitor 57 side from the boost converter 55 is driven or a slight short circuit occurs ( Step S170), this routine is finished. Thereby, it is possible to specify that the cause of the power consumption abnormality occurs on the capacitor 57 side from the boost converter 55.

  As described above, when the power consumption abnormality occurs, the cause of the power consumption abnormality can be specified using the voltages VH and VL and the auxiliary voltage VA when the power consumption abnormality occurs. Compared with the one that drives the DC converter 62 sequentially to identify the cause of the power consumption abnormality, the cause of the power consumption abnormality can be identified more quickly.

  In the hybrid vehicle 20 of the embodiment described above, when the precharge is executed and the power consumption abnormality is determined, when the voltage VH of the capacitor 57 is higher than the battery voltage VB of the high voltage battery 50, the power consumption abnormality stops. It is determined that the abnormality has occurred due to driving of the boost converter 55 to be performed. Then, when the power consumption abnormality is determined by executing the precharge, when the voltage VH is equal to or lower than the battery voltage VB and the difference obtained by subtracting the voltage VL from the voltage VH is larger than the threshold value Vth1, the power consumption abnormality is It is determined that the abnormality has occurred on the high voltage battery 50 side from the boost converter 55. Further, when it is determined that an abnormality has occurred on the high voltage battery 50 side from the boost converter 55, the power consumption abnormality is an abnormality caused by the driving of the DC / DC converter 62 when the auxiliary machine voltage VA is larger than the threshold value Vth2. Judge that there is. As a result, when the boost converter 55 and the DC / DC converter 62 are sequentially driven to identify the cause of the power consumption abnormality, the cause of the power consumption abnormality can be identified more quickly.

  In the hybrid vehicle 20 of the embodiment, the threshold value Vth2 is set to the initial open circuit voltage OCV of the auxiliary machine 61, but may be a voltage higher than the closed circuit voltage CCV of the auxiliary machine 61, for example, from the initial open circuit voltage OCV. A slightly higher voltage or a slightly lower voltage may be used.

  In the hybrid vehicle 20 according to the embodiment, the abnormality cause determination routine illustrated in FIG. 3 is executed when the precharge is executed and the power consumption abnormality is determined. However, after the precharge is executed, the power consumption abnormality is performed. It is good also as what performs the abnormality cause determination routine illustrated in FIG.

  In the embodiment, the case where the power supply device of the present invention is applied to a hybrid vehicle has been exemplified. However, the present invention may be applied to any device as long as the device includes two loads that are operated by electric power from a battery. In this case, the boost converter 55 may supply power to one of the two loads, and the DC / DC converter 62 may supply power to the other of the two loads.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the high voltage battery 50 corresponds to “battery”, the boost converter 55 corresponds to “boost converter”, the DC / DC converter 62 corresponds to “DC / DC converter”, and the capacitor 58 corresponds to “first”. The capacitor 57 corresponds to a “second capacitor”, the system main relay 56 corresponds to a “precharge circuit”, and the motor ECU 40, the battery ECU 52, and the HVECU 70 correspond to “precharge execution means”. The motor ECU 40, the battery ECU 52, and the HVECU 70 correspond to “first determination means”, the motor ECU 40, the battery ECU 52, and the HVECU 70 correspond to “second determination means”, and the motor ECU 40, the battery ECU 52, and the HVECU 70 Corresponds to “3 determination means”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. In other words, the interpretation of the invention described in the column of means for solving the problem should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problem. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the power supply device manufacturing industry.

  20 hybrid vehicle, 22 engine, 24 engine electronic control unit (engine ECU), 26 crankshaft, 30 planetary gear, 36 drive shaft, 37 differential gear, 38a, 38b drive wheel, 40 motor electronic control unit (motor ECU), 41, 42 Inverter, 50 High voltage battery, 51 Voltage sensor, 52 Battery electronic control unit (battery ECU), 54a Drive voltage system power line, 54b Battery voltage system power line, 54c Low voltage system power line, 55 Boost converter, 56 system main relay, 57, 58 capacitor, 57a, 58a, 61a voltage sensor, 59 discharge resistance, 60 low voltage battery, 61 auxiliary machine, 62 DC / DC converter, 70 electronic control unit for hybrid HVECU), 80 ignition switch, 81 shift lever, 82 shift position sensor, 83 accelerator pedal, 84 accelerator pedal position sensor, 85 brake pedal, 86 brake pedal position sensor, 88 vehicle speed sensor, L reactor, MG1, MG2 motor, SMRB positive electrode Side relay, SMRG negative side relay, SMRP precharge relay, R precharge resistor, T11-T16, T21-T26, T31, T32 transistors, D11-D16, D21-D26, D31, D32 diodes.

Claims (1)

Battery,
A reactor, two switching elements constituting an upper arm and a lower arm, and two diodes connected in parallel to the two switching elements in the reverse direction, and boosting the power from the battery to increase the first A boost converter capable of supplying a load;
A DC / DC converter that converts a voltage of a first power bus connecting the battery and the boost converter and supplies the converted voltage to a second load;
A first capacitor connected to the first power bus;
A second capacitor connected to a second power bus between the boost converter and the first load;
A precharge circuit for supplying power from the battery to the first capacitor and the second capacitor;
The two switching elements of the boost converter are turned off to stop driving the boost converter, and also stop driving the DC / DC converter and use the power from the battery via the precharge circuit to stop the first converter. Precharge execution means for performing precharge for charging the capacitor and the second capacitor;
A power supply device comprising:
In the case where the precharge is executed, when the voltage of the second capacitor is larger than the voltage between the terminals of the battery, first determination means for determining that an abnormality has occurred due to driving of the boost converter;
When the precharge is executed, a voltage obtained by subtracting the voltage of the first capacitor from the voltage of the second capacitor is equal to or less than a first predetermined value when the voltage of the second capacitor is equal to or lower than the voltage between the terminals of the battery. A second determination means for determining that an abnormality has occurred on the battery side from the step-up converter when larger,
When it is determined by the second determination means that an abnormality has occurred on the battery side from the boost converter, when the voltage of the second load is greater than a second predetermined value, an abnormality caused by driving of the DC / DC converter Third determination means for determining that occurrence has occurred;
A power supply device comprising:

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