JP5251704B2 - Abnormality judgment method for automobile and booster circuit mounted in automobile - Google Patents

Description

  The present invention relates to an abnormality determination method for an automobile and a booster circuit mounted on the automobile. More specifically, the present invention relates to an electric motor capable of inputting / outputting driving power, a drive circuit for driving the electric motor, and a first chargeable / dischargeable first. A battery, a first booster circuit that boosts power from the first battery and supplies the boosted power to the drive circuit, a first connection release unit that disconnects and disconnects the first battery from the first booster circuit, and charge / discharge A second possible battery, a second booster circuit that boosts power from the second battery and supplies it to the drive circuit, and a second connection release means for connecting and releasing the connection between the second battery and the second booster circuit And an abnormality determination method for determining abnormality of a second booster circuit mounted on such an automobile.

  Conventionally, this type of automobile includes a booster circuit that boosts electric power from a battery and supplies it to a motor drive circuit that outputs motive power for traveling, and includes a first voltage sensor that detects the voltage of the battery, and a booster When an abnormality occurs in one or two of the second voltage sensor for detecting the voltage on the battery side of the circuit and the third voltage sensor for detecting the voltage on the drive circuit side of the booster circuit, the upper arm of the booster circuit is There has been proposed a transistor in which a constituent transistor is fixed in an on state (see, for example, Patent Document 1). In this automobile, even when an abnormality occurs in one or two of the three voltage sensors, the above-described control ensures traveling using a normal voltage sensor.

JP 2007-330089 A

  Some hybrid vehicles and electric vehicles have been proposed that can charge a battery using electric power from an external power source when the system is stopped. These vehicles are equipped with a plurality of batteries and can be used for traveling simultaneously from a plurality of batteries. It is also conceivable to supply power to the motor. In this case, in order to manage the power supply from each battery, it is preferable to separately provide a booster circuit for each battery and the motor drive circuit. However, it is desirable to appropriately perform an abnormality in the booster circuit.

  The main object of the abnormality determination method for the booster circuit mounted on the automobile and the automobile of the present invention is to determine the abnormality of the booster circuit without providing a special sensor.

  In order to achieve the above-mentioned main object, the present invention adopts the following means to determine the abnormality of the automobile and the booster circuit mounted on the automobile.

The automobile of the present invention
An electric motor capable of inputting / outputting driving power; a driving circuit for driving the electric motor; a first battery capable of charging / discharging; and a first circuit for boosting electric power from the first battery and supplying the boosted electric power to the driving circuit. 1 booster circuit, first connection release means for connecting and releasing the first battery and the first booster circuit, a chargeable / dischargeable second battery, and boosting power from the second battery And a second booster circuit for supplying to the drive circuit, and a second connection release means for connecting and releasing the connection between the second battery and the second booster circuit,
Voltage detecting means for detecting a voltage on the second battery side of the second booster circuit;
The voltage in a state in which the first battery and the first booster circuit are connected by the first connection release means and the connection between the second battery and the second booster circuit is released by the second connection release means. An abnormality determination unit that determines that an abnormality has occurred in the second booster circuit when the voltage detected by the detection unit is equal to or higher than a predetermined voltage;
It is a summary to provide.

  In the vehicle of the present invention, the first battery is connected to the first booster circuit by the first connection release means, and the second battery is disconnected from the second booster circuit by the second connection release means. When the voltage on the second battery side of the second booster circuit is equal to or higher than a predetermined voltage, it is determined that an abnormality has occurred in the second booster circuit. This is based on the fact that the voltage on the second battery side of the second booster circuit is low when the connection between the second battery and the second booster circuit is released. Thereby, the abnormality of the second booster circuit can be determined without providing a special sensor.

  In such an automobile of the present invention, the second booster circuit includes a first switching element having a positive terminal connected to a positive terminal of the driving circuit, and a positive terminal and a negative terminal of the first switching element. The first diode connected in the opposite direction, the positive electrode terminal connected to the negative electrode terminal of the first switching element, and the negative electrode connection terminal of the drive circuit and the second connection release means A second switching element to which a negative electrode of the second battery is connected, a second diode connected in a reverse direction to a positive terminal and a negative terminal of the second switching element, and the first switching element One terminal is connected to the negative electrode side terminal of the second switching element and the positive electrode side terminal of the second switching element, and the positive electrode of the second battery is connected to the other terminal via the second connection release means. A reactor connected to a child, and the abnormality determining means is means for determining an abnormality due to the first switching element being fixed as an abnormality of the second booster circuit. You can also.

  In the automobile of the present invention, when the abnormality determining unit determines that an abnormality has occurred in the second booster circuit, the first connection release unit connects the first battery and the first booster circuit. It is also possible to provide an abnormality control means for releasing the system and stopping the system. In this way, it is possible to prevent the smoothing capacitor connected to the second battery side of the second booster circuit from being damaged. In this case, the abnormal time control means can be a means for prohibiting the next system activation, and the abnormal time control means can perform the first connection release means as a retreating travel at the next system activation. The first battery may be allowed to travel on the condition that the connection between the first battery and the first booster circuit is permitted and the boosting by the first booster circuit is prohibited. If it carries out like this, evacuation driving | running | working can be performed.

  Further, in the automobile of the present invention, the second battery is a plurality of batteries, and the second connection release means is a plurality of connections for releasing and connecting each of the plurality of batteries to the second booster circuit. It can also be a connection release means.

  Further, in the automobile of the present invention, three internal combustion engines, a generator capable of inputting and outputting power, a drive shaft connected to an axle, an output shaft of the internal combustion engine, and a rotation shaft of the generator, A planetary gear mechanism to which a rotating element is connected, and the electric motor is attached to the drive shaft so as to input and output power.

The abnormality determination method of the booster circuit mounted on the automobile of the present invention is as follows:
An electric motor capable of inputting / outputting driving power; a driving circuit for driving the electric motor; a first battery capable of charging / discharging; and a first circuit for boosting electric power from the first battery and supplying the boosted electric power to the driving circuit. 1 booster circuit, first connection release means for connecting and releasing the first battery and the first booster circuit, a chargeable / dischargeable second battery, and boosting power from the second battery The second booster circuit in the automobile, comprising: a second booster circuit that supplies the drive circuit to the driver circuit; and a second connection release unit that connects and disconnects the second battery and the second booster circuit. An abnormality determination method for determining an abnormality of
Voltage detecting means for detecting a voltage on the second battery side of the second booster circuit;
The first battery and the first booster circuit are connected by the first connection release means, and the second battery and the second booster circuit are disconnected by the second connection release means. Determining that an abnormality has occurred in the second booster circuit when the voltage on the second battery side of the two booster circuit is equal to or higher than a predetermined voltage;
This is the gist.

  In this abnormality determination method for a booster circuit mounted on an automobile of the present invention, the first battery and the first booster circuit are connected by the first connection release means, and the second battery and the second booster circuit are connected by the second connection release means. When the voltage on the second battery side of the second booster circuit is equal to or higher than a predetermined voltage in a state where the connection with is disconnected, it is determined that an abnormality has occurred in the second booster circuit. This is based on the fact that the voltage on the second battery side of the second booster circuit is low when the connection between the second battery and the second booster circuit is released. Thereby, the abnormality of the second booster circuit can be determined without providing a special sensor.

1 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 20 as an embodiment of the present invention. FIG. 3 is a configuration diagram showing an outline of configurations of a master side booster circuit 55 and a slave side booster circuit 65. It is a flowchart which shows an example of the slave side step-up circuit abnormality determination processing routine performed by the hybrid electronic control unit of the embodiment. FIG. 11 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 120 according to a modification. FIG. 11 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 220 of a modified example. FIG. 11 is a configuration diagram illustrating an outline of a configuration of a modified example of an electric vehicle 320.

  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 as an embodiment of the present invention. As shown in the figure, the hybrid vehicle 20 of the embodiment includes an engine 22 that uses gasoline or light oil as fuel, an engine electronic control unit (hereinafter referred to as engine ECU) 24 that controls the drive of the engine 22, and a crank of the engine 22. A planetary gear 30 in which a carrier is connected to the shaft 26 and a ring gear is connected to the drive shaft 32 connected to the drive wheels 39a and 39b via a differential gear 38, and a rotor is configured as a synchronous generator motor, for example. A motor MG1 connected to the sun gear, a motor MG2 configured as a synchronous generator motor and having a rotor connected to the drive shaft 32, inverters 41 and 42 for driving the motors MG1 and MG2, and inverters 41, 42 switching elements (not shown) A motor electronic control unit (hereinafter referred to as a motor ECU) that controls the motors MG1 and MG2 by controlling the driving, a master battery 50, slave batteries 60 and 62 configured as lithium ion secondary batteries, and a master battery 50 Are connected to a power line 59 (hereinafter referred to as a first low voltage system power line) 59 connected via a system main relay 56 and a power line (hereinafter referred to as a high voltage system power line) 54 to which inverters 41 and 42 are connected. A master side booster circuit 55 that can boost the power from the connected master battery 50 and supply the boosted power to the inverters 41 and 42, and a power line (slave) connected to the slave batteries 60 and 62 via system main relays 66 and 67, respectively. 69 and the high voltage power line 5). Of the slave batteries 60 and 62 connected to the second low-voltage power line 69 (hereinafter referred to as connection-side slave battery) to the inverters 41 and 42. A booster circuit 65, a battery electronic control unit (hereinafter referred to as a battery ECU) 52 that manages the master battery 50 and the slave batteries 60 and 62, and a first low voltage system power line 59 via a DC / DC converter 96. A low voltage battery 98 connected, a charger 90 connected to the second low voltage system power line 69, and an AC external power source (for example, a household power source (AC100V AC) connected to the charger 90 and a power source outside the vehicle. ) Etc.) The vehicle side connector 92 formed so that the external power supply side connector 102 connected to 100 is connectable, A hybrid electronic control unit 70 that communicates with the gin ECU 24, the motor ECU 40, and the battery ECU 52 to control the entire vehicle. Here, the charger 90 is connected to the second low voltage system power line 69 and the vehicle-side connector 92, and is connected to a charging relay, or AC / AC that converts AC power from the external power source 100 to DC power. A DC converter, a DC / DC converter that converts the voltage of the DC power converted by the AC / DC converter and supplies the converted voltage to the second low-voltage system. Hereinafter, for convenience of explanation, the inverters 41 and 42 from the master booster 55 and the slave booster 65 are referred to as a high voltage system, and the master battery 50 from the master booster 55 is referred to as a first low voltage system. The slave battery 60, 62 side from the slave side booster circuit 65 is referred to as a second low voltage system.

  As shown in FIG. 2, the master side booster circuit 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 L1. The two transistors T31 and T32 are connected to the positive and negative buses in the power line 54 to which the inverters 41 and 42 are connected, respectively, and the reactor L1 is connected to the connection point of the two transistors T31 and T32. . Further, a positive terminal and a negative terminal of master battery 50 are connected to reactor L1 and negative bus via system main relay 56, respectively. Therefore, by controlling on / off of the transistors T31 and T32, the DC power of the master battery 50 is boosted and supplied to the inverters 41 and 42, or the DC voltage acting on the positive and negative buses is lowered. The master battery 50 can be charged. Similarly to the master-side booster circuit 55, the slave-side booster circuit 65 includes two transistors T41 and T42, two diodes D41 and D42 connected in parallel to the transistors T41 and T42 in the reverse direction, and a reactor L2. The two transistors T41 and T42 are connected to the positive and negative buses in the power line 54 to which the inverters 41 and 42 are connected, respectively, and the reactor L2 is connected to the connection point of the two transistors T41 and T42. . Reactor L2 and negative bus are connected to the positive and negative terminals of slave batteries 60 and 62 via system main relays 66 and 67, respectively. Therefore, by controlling on / off of the transistors T41 and T42, the DC power of the slave batteries 60 and 62 is boosted and supplied to the inverters 41 and 42, or the DC voltage acting on the positive and negative buses is lowered. Then, the slave batteries 60 and 62 can be charged.

  The battery ECU 52 has signals necessary for managing the master battery 50 and the slave batteries 60 and 62, for example, the terminal voltage Vb 1 from the voltage sensor 51 a installed between the terminals of the master battery 50, and the positive electrode of the master battery 50. Sensor installed between the terminals of the charge / discharge current Ib1 from the current sensor 51b attached to the output terminal on the side, the battery temperature Tb1 from the temperature sensor 51c attached to the master battery 50, and the slave batteries 60 and 62 The inter-terminal voltages Vb2 and Vb3 from 61a and 63a, the charging / discharging currents Ib2 and Ib3 from the current sensors 61b and 63b attached to the positive output terminals of the slave batteries 60 and 62, respectively, to the slave batteries 60 and 62, respectively. Battery temperature T from the attached temperature sensors 61c and 63c 2, such as Tb3 is input, and outputs to the hybrid electronic control unit 70 via communication data relating to the state of the master battery 50 and the slave batteries 60 and 62 as needed. Further, in order to manage the master battery 50, the battery ECU 52 calculates the storage amount SOC1 based on the integrated value of the charge / discharge current Ib1 detected by the current sensor 51b, or calculates the stored storage amount SOC1 and the battery temperature Tb1. In order to calculate the input / output limits Win1 and Wout1, which are the maximum allowable powers that may charge / discharge the master battery 50 based on the above, and to detect the slave batteries 60 and 62, they are detected by the current sensors 61b and 63b. Based on the integrated values of the charge / discharge currents Ib2 and Ib3, the storage amounts SOC2 and SOC3 are calculated, or the input / output limit Win2 of the slave batteries 60 and 62 is calculated based on the calculated storage amounts SOC2 and SOC3 and the battery temperatures Tb2 and Tb3. , Wout2, Win3, Wout3. The input / output limits Win1 and Wout1 of the master battery 50 set the basic values of the input / output limits Win1 and Wout1 based on the battery temperature Tb1, and the input limiting correction coefficient and the input based on the stored amount SOC1 of the master battery 50. It can be set by setting a correction coefficient for restriction and multiplying the basic value of the set input / output restrictions Win1 and Wout1 by the correction coefficient. The input / output limits Win2, Wout2, Win3, Wout3 of the slave batteries 60, 62 can be set similarly to the input / output limits Win1, Wout1 of the master battery 50.

  The hybrid electronic control unit 70 is configured as a microprocessor centered on the CPU 72, and in addition to the CPU 72, a ROM 74 for storing processing programs, a RAM 76 for temporarily storing data, an input / output port and communication not shown. And a port. The hybrid electronic control unit 70 includes a voltage (high voltage system voltage) VH from the voltage sensor 57 a attached between the terminals of the capacitor 57 and a voltage from the voltage sensor 58 a attached between the terminals of the capacitor 58 ( (Voltage of the first low voltage system) VL1, voltage from the voltage sensor 68a attached between the terminals of the capacitor 68 (second low voltage system voltage) VL2, on the high voltage system power line 54 side of the slave side booster circuit 65. Current Icon attached to the terminal 2, ignition signal from the ignition switch 80, shift position SP from the shift position sensor 82 that detects the operation position of the shift lever 81, and accelerator pedal position sensor 84 that detects the amount of depression of the accelerator pedal 83 Accelerator opening Acc, brake pedal 85 A brake pedal position BP from a brake pedal position sensor 86 that detects the amount of write seen, a vehicle speed V from a vehicle speed sensor 88 is input through the input port. From the hybrid electronic control unit 70, a switching control signal to the switching element of the master side booster circuit 55, a switching control signal to the switching element of the slave side booster circuit 65, and a drive signal to the system main relays 56, 66, 67 , A control signal to the charger 90 is output via the output port.

  In the hybrid vehicle 20 of the embodiment thus configured, when the external power supply side connector 102 and the vehicle side connector 92 are connected after the vehicle is stopped at the home or a preset charging point, charging in the charger 90 is performed. The main relays 56, 66, 67 are turned on and off, and the AC / DC converter and DC / DC converter in the charger 90 are used to control the master battery 50 and the slave using the power from the external power source 100. The batteries 60 and 62 are set to a fully charged state or a predetermined charged state lower than the fully charged state (for example, a state where the storage amounts SOC1, SOC2 and SOC3 are 80% or 85%). Therefore, when the system is started (ignition is turned on) while the master battery 50 and the slave batteries 60 and 62 are sufficiently charged, the power from the master battery 50 and the slave batteries 60 and 62 is used. It is possible to travel a certain distance (time) in a motor operation mode in which the vehicle travels using only power input / output from / to motor MG2. In addition, since the hybrid vehicle 20 of the embodiment includes the slave batteries 60 and 62 in addition to the master battery 50, the traveling distance (traveling time) in the motor operation mode is made longer than that including only the master battery 50. be able to.

  Further, in the hybrid vehicle 20 of the embodiment, when the system is started (ignition-on) while the master battery 50 and the slave batteries 60 and 62 are sufficiently charged using the power from the external power supply 100, the system main relay 56 is turned on to connect the master battery 50 and the master side booster circuit 55 and the system main relay 66 is turned on to connect the slave battery 60 and the slave side booster circuit 65 (hereinafter this state is referred to as a first connection state). . Then, input / output from the motor MG2 is performed while controlling the master-side booster circuit 55 and the slave-side booster circuit 65 so that the stored amount SOC2 of the slave battery 60 rapidly decreases as compared with the stored amount SOC1 of the master battery 50. The motor operation mode preferentially travels between the motor operation mode that travels using only power and the hybrid operation mode that travels with the output of power from the engine 22, and the charged amount SOC2 of the slave battery 60 is a predetermined value Sref2. (For example, 25%, 30%, 35%, etc.) or less, the system main relay 66 is turned off, the slave battery 60 and the slave booster circuit 65 are disconnected, the system main relay 67 is turned on, and the slave battery 62 and the slave Side booster circuit 65 (hereinafter this state is referred to as a second connection) State), the charged amount SOC1 of the master battery 50 becomes equal to or less than a predetermined value Sref1 (for example, 30%, 35%, 40%, etc.) and the charged amount SOC3 of the slave battery 62 becomes a predetermined value Sref3 (for example, 25% or 30%). The motor operation mode is preferentially run while controlling the master-side booster circuit 55 and the slave-side booster circuit 65 so as to be less than When the charged amount SOC1 of the master battery 50 becomes equal to or smaller than the predetermined value Sref1 and the charged amount SOC3 of the slave battery 62 becomes equal to or smaller than the predetermined value Sref3, the system main relay 67 is turned off, and the slave battery 62 and the slave booster circuit 65 are connected. After disconnecting, the engine 22 travels while intermittently operating the engine 22 based on the required power required for the vehicle using only the master battery 50 of the master battery 50 and the slave batteries 60 and 62. Hereinafter, when the system main relays 66 and 67 are both turned off when switching from the first connected state to the second connected state, the charged amount SOC1 of the master battery 50 becomes equal to or less than the predetermined value Sref1, and the charged amount of the slave battery 62 A state in which the SOC 3 is equal to or lower than the predetermined value Sref3 and the system main relay 67 is turned off is referred to as a slave cutoff state.

  Further, in the hybrid vehicle 20 of the embodiment, when traveling in the motor operation mode, the hybrid electronic control unit 70 transmits an operation stop signal for stopping the operation of the engine 22 to the engine ECU 24, and a torque command Tm1 for the motor MG1. A value 0 is set for *, and a required torque Tr * set according to the accelerator opening Acc from the accelerator pedal position sensor 84 and the vehicle speed V from the vehicle speed sensor 88 is set to control input / output limits Win and Wout described later. The torque command Tm2 * of the motor MG2 is set within the range, and the set torque commands Tm1 * and Tm2 * are transmitted to the motor ECU 40. The engine ECU 24 that has received the operation stop signal stops the operation of the engine 22, and the motor ECU 40 that has received the torque commands Tm1 * and Tm2 * receives the inverter 41 so that the motors MG1 and MG2 are driven by the torque commands Tm1 * and Tm2 *. , 42 is subjected to switching control. On the other hand, when traveling in the hybrid operation mode, the hybrid electronic control unit 70 rotates the required torque Tr * to the rotational speed of the drive shaft 32 (the rotational speed obtained by multiplying the rotational speed Nm2 of the motor MG2 and the vehicle speed V by a conversion factor). To calculate the driving power Pr * required for driving, and from the calculated driving power Pr *, the charging / discharging required power Pb * required by the master battery 50 and the slave batteries 60, 62 (positive on the discharging side, charging) The required power Pe * required for the engine 22 is calculated by subtracting the negative power from the negative side), and the operation line as the relationship between the rotational speed and torque of the engine 22 that can efficiently output the required power Pe * from the engine 22 A target rotational speed Ne * and a target torque Te * of the engine 22 are set and controlled based on (for example, an optimum fuel efficiency operation line) and the required power Pe * The torque command Tm1 * of the motor MG1 is set and the motor MG1 is torqued by the rotational speed feedback control so that the rotational speed Ne of the engine 22 becomes the target rotational speed Ne * within the range of the input / output limits Win and Wout. The torque obtained by subtracting the torque acting on the drive shaft 32 via the planetary gear 30 from the required torque Tr * when driven by the command Tm1 * is set as the torque command Tm2 * of the motor MG2, and the target rotational speed Ne * and the target torque Te are set. * Is transmitted to the engine ECU 24, and torque commands Tm1 * and Tm2 * are transmitted to the motor ECU 40. The engine ECU 24 that has received the target rotational speed Ne * and the target torque Te * controls the intake air amount of the engine 22 and the fuel so that the engine 22 is operated at the operating point consisting of the target rotational speed Ne * and the target torque Te *. The motor ECU 40 that executes the injection control, the ignition control, etc., and receives the torque commands Tm1 *, Tm2 * of the motors MG1, MG2, the inverters 41, 42 so that the motors MG1, MG2 are driven by the torque commands Tm1 *, Tm2 *. Switching control of the switching elements. In the embodiment, the charge / discharge required power Pb * when traveling in the hybrid operation mode is a slave battery (hereinafter, referred to as “accumulation amount SOC1” of the master battery 50 and the slave side booster circuit 65 among the slave batteries 60 and 62). It is set based on the amount of electricity stored in the connection side slave battery). Further, the control input / output limits Win and Wout when traveling in the motor operation mode and the hybrid operation mode control the sum of the input limit Win1 of the master battery 50 and the input limit Win2 of the slave battery 60 in the first connection state. And the sum of the output limit Wout1 of the master battery 50 and the output limit Wout2 of the slave battery 60 is set as the control output limit Wout. When the second connection state is established, the input limit Win1 of the master battery 50 is set. The sum of the input limit Win3 of the slave battery 62 is set as the control input limit Win, and the sum of the output limit Wout1 of the master battery 50 and the output limit Wout3 of the slave battery 62 is set as the control output limit Wout, and the slave is shut off. When the state Input and output limits of the master battery 50 Win1, control the Wout1 output limits Win, and shall be set as Wout.

  Next, the operation of the hybrid vehicle 20 of the embodiment configured as described above, particularly the operation when determining the abnormality of the slave side booster circuit 65 will be described. FIG. 3 is a flowchart illustrating an example of a slave-side boosted opening degree abnormality determination processing routine executed by the hybrid electronic control unit 70. This routine is repeatedly executed at predetermined time intervals (for example, every several tens msec or every several hundred msec) until an abnormality of the slave side booster circuit 65 is determined.

  When this routine is executed, the CPU 72 of the hybrid electronic control unit 70 first sets the connection state of the slave batteries 60 and 62, the voltage VL2 of the second low voltage system from the voltage sensor 68a, etc. A process of inputting data necessary to determine abnormality is executed (step S100). Here, the connection state of the slave batteries 60 and 62 is one of the connection states of the first connection state, the second connection state, and the slave cutoff state described above.

  Next, it is determined whether or not the input connection state is a slave cutoff state, that is, whether or not the system main relay 56 is on and the system main relays 66 and 67 are both off (step S110). When it is not in the slave cutoff state, it is determined that it is not suitable for the abnormality determination by this routine, and this routine is terminated. When the input connection state is the slave cutoff state, it is determined whether or not the second low voltage system voltage VL2 is greater than or equal to the threshold value Vref (step S120), and the second low voltage system voltage VL2 is less than the threshold value Vref. Sometimes, it is determined that no abnormality has occurred in the slave side booster circuit 65, and this routine is terminated. Here, the threshold value Vref is set as a value equal to or larger than a value obtained by adding a margin to the tolerance of the voltage sensor 68a, and can be determined by the performance of the voltage sensor 68a.

  On the other hand, when the voltage VL2 of the second low-voltage system is equal to or higher than the threshold value Vref, it is determined that an abnormality that the transistor T41 constituting the upper arm of the slave side booster circuit 65 is fixed on has occurred (step S130). The activation is prohibited (step S140), the system is stopped (step S150), and this routine is terminated. Here, the next system activation is prohibited because the system is activated in a state where the transistor T41 of the slave side booster circuit 65 is fixed on and the power from the master battery 50 is boosted by the master side booster circuit 55. This is because when the voltage is supplied to the voltage system, the voltage also acts on the capacitor 68 connected to the second low voltage system, and the capacitor 68 may be damaged. The system is stopped by shutting down the inverters 41 and 42, discharging the capacitors 57 and 58, turning off the system main relay 56, and the like.

  According to the hybrid vehicle 20 of the embodiment described above, when the system main relay 56 is on and the system main relays 66 and 67 are both off, and the second low voltage system voltage VL2 is equal to or higher than the threshold Vref, the slave Since it is determined that there is an abnormality in which the transistor T41 constituting the upper arm of the side booster circuit 65 is fixed on, the abnormality of the slave booster circuit 65 can be determined without providing a special sensor. In addition, when it is determined that there is an abnormality in which the transistor T41 of the slave side booster circuit 65 is turned on, the next system activation is prohibited or the system is stopped, so that the high voltage system voltage acts on the capacitor 68. This can prevent the capacitor 68 from being damaged.

  In the hybrid vehicle 20 of the embodiment, when it is determined that an abnormality has occurred in which the transistor T41 of the slave side booster circuit 65 is fixed on, the next system activation is prohibited or the system is stopped. The retreat travel that travels by driving the motor MG1 or the motor MG2 within the range in which the boosting by 55 is not performed may be permitted. In this case, since the boosting by the master side booster circuit 55 is not performed even if the travel is permitted, even if the high voltage system voltage acts on the second low voltage system capacitor 68, the voltage of the first low voltage system is not increased. Since it only acts, the capacitor 68 is not damaged.

  In the hybrid vehicle 20 of the embodiment, the master battery 50, the master side booster circuit 55, the slave batteries 60 and 62, and the slave side booster circuit 65 are provided. However, the number of slave batteries is not limited to two, but one or three. It is good also as what is provided above.

  In the hybrid vehicle 20 of the embodiment, the power from the engine 22 is output to the drive shaft 32 connected to the drive wheels 39a and 39b via the planetary gear 30, and the power from the motor MG2 is output to the drive shaft 32. However, as illustrated in the hybrid vehicle 120 of the modification of FIG. 4, the power from the engine 22 is output to the drive shaft 32 connected to the drive wheels 39a and 39b via the planetary gear 30, and the power from the motor MG2 is output. It may be output to an axle (an axle to which wheels 39c and 39d are connected) different from an axle to which the driving shaft 32 is connected (an axle to which the drive wheels 39a and 39b are connected).

  In the hybrid vehicle 20 of the embodiment, the power from the engine 22 is output to the drive shaft 32 connected to the drive wheels 39a and 39b via the planetary gear 30, and the power from the motor MG2 is output to the drive shaft 32. However, as illustrated in the hybrid vehicle 220 of the modified example of FIG. 5, a motor MG is attached to a drive shaft connected to the drive wheels 39a and 39b via a transmission 230, and a rotation shaft of the motor MG is connected to a rotation shaft via a clutch 228. The engine 22 is connected, and the power from the engine 22 is output to the drive shaft via the rotating shaft of the motor MG and the transmission 230, and the power from the motor MG is output to the drive shaft via the transmission 230. It is good also as what to do.

  In the embodiment, the present invention is applied to the hybrid vehicle 20 including the engine 22 and the motor MG1 connected to the drive shaft 32 via the planetary gear 30, and the motor MG2 connected to the drive shaft 32. As exemplified in the modified electric vehicle 320, the electric vehicle 320 may be applied to a simple electric vehicle including a motor MG that outputs driving power.

  Moreover, it is not limited to what is applied to such a motor vehicle, It is good also as a form of the control method of a motor vehicle.

  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 motor MG2 corresponds to the “motor”, the inverter 42 corresponds to the “drive circuit”, the master battery 50 corresponds to the “first battery”, and the master boost circuit 55 corresponds to the “first boost circuit”. The system main relay 56 corresponds to “first connection release means”, the slave batteries 60 and 62 correspond to “second battery”, and the slave booster circuit 65 corresponds to “second booster circuit”. The system main relays 66 and 67 correspond to “second connection release means”, the voltage sensor 68a for detecting the voltage of the second low voltage system corresponds to “voltage detection means”, and the system main relay 56 is on and the system is turned on. A transistor that constitutes the upper arm of the slave booster circuit 65 when the main relays 66 and 67 are both in the slave cutoff state and the voltage VL2 of the second low voltage system is equal to or higher than the threshold value Vref. T41 hybrid electronic control unit 70 executing the slave-side booster circuit malfunction determination routine of determining Figure 3 abnormalities on-fixation has occurred corresponds to "abnormality determination means".

  Here, the “motor” is not limited to the motor MG2 configured as a synchronous generator motor, and may be any type of motor that can input and output driving power, such as an induction motor. It doesn't matter. The “driving circuit” is not limited to the inverter 42 and may be any circuit as long as it is for driving an electric motor. The “first battery” is not limited to the master battery 50 configured as a lithium ion secondary battery, but may be a chargeable / dischargeable battery such as a nickel hydride secondary battery, a nickel cadmium secondary battery, or a lead storage battery. It does not matter as long as it is anything. Further, the “first battery” is not limited to the single master battery 50, and may be configured by a plurality of batteries. The “first booster circuit” is not limited to the master-side booster circuit 55, and may be any one as long as it boosts the power from the first battery and supplies it to the drive circuit. The “first connection release means” is not limited to the system main relay 56, and may be any device as long as it can connect and disconnect the first battery and the first booster circuit. The “second battery” is not limited to the slave batteries 60 and 62 configured as lithium ion secondary batteries, but can be charged and discharged, such as nickel hydride secondary batteries, nickel cadmium secondary batteries, and lead storage batteries. Anything can be used. Further, the “second battery” is not limited to the two slave batteries 60 and 62, and may be constituted by a single battery or three or more batteries. The “second booster circuit” is not limited to the slave-side booster circuit 65, and may be any circuit as long as it boosts the power from the second battery and supplies it to the drive circuit. The “second connection release means” is not limited to the system main relays 66 and 67, and any means may be used as long as it can connect and disconnect the second battery and the second booster circuit. Absent. The “voltage detection means” is not limited to the voltage sensor 68a, and any voltage detection means may be used as long as it detects the voltage on the second battery side of the second booster circuit. As the “abnormality determination means”, when the system main relay 56 is on and the system main relays 66 and 67 are both off and the slave low-voltage system voltage VL2 is greater than or equal to the threshold Vref, The first battery is connected to the first booster circuit by the first connection release means and the second connection is not limited to the case where it is determined that the abnormality that the transistor T41 constituting the upper arm is fixed on is generated. If the voltage detected by the voltage detecting means is equal to or higher than a predetermined voltage in a state where the connection between the second battery and the second booster circuit is released by the releasing means, it is determined that an abnormality has occurred in the second booster circuit. It does not matter as long as it is anything.

  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. That is, the interpretation of the invention described in the column of means for solving the problems 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 problems. 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 is applicable to the automobile manufacturing industry.

  20, 120, 220, 320 Hybrid vehicle, 22 engine, 24 engine electronic control unit (engine ECU), 26 crankshaft, 28 damper, 30 planetary gear, 32 drive shaft, 38 differential gear, 39a, 39b drive wheel, 39c, 39d Wheel, 40 Electronic control unit for motor (motor ECU), 41, 42 Inverter, 50 Master battery, 51a, 61a, 63a Voltage sensor, 51b, 61b, 63b Current sensor, 51c, 61c, 63c Temperature sensor, 52 For battery Electronic control unit (battery ECU), 54 High voltage system power line, 55 Master side boost circuit, 56, 66, 67 System main relay, 57, 58, 68 Capacitor, 57a, 58a, 68a Voltage sensor, 59 1st low voltage system power line, 60, 62 slave battery, 65 slave side booster circuit, 69 2nd low voltage system power line, 70 electronic control unit for hybrid, 72 CPU, 74 ROM, 76 RAM, 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, 90 Battery charger, 92 Vehicle side connector, 96 DC / DC converter, 98 Low voltage battery , 100 External power supply, 102 External power supply side connector, 228 Clutch, 230 Transmission, MG1, MG2, MG motor, D31, D32, D41, D42 Diode, T31, T32, T41, T42 Jista, L1, L2 reactor.

Claims (8)

An electric motor capable of inputting / outputting driving power; a driving circuit for driving the electric motor; a first battery capable of charging / discharging; and a first circuit for boosting electric power from the first battery and supplying the boosted electric power to the driving circuit. 1 booster circuit, first connection release means for connecting and releasing the first battery and the first booster circuit, a chargeable / dischargeable second battery, and boosting power from the second battery And a second booster circuit for supplying to the drive circuit, and a second connection release means for connecting and releasing the connection between the second battery and the second booster circuit,
Voltage detecting means for detecting a voltage on the second battery side of the second booster circuit;
The voltage in a state in which the first battery and the first booster circuit are connected by the first connection release means and the connection between the second battery and the second booster circuit is released by the second connection release means. An abnormality determination unit that determines that an abnormality has occurred in the second booster circuit when the voltage detected by the detection unit is equal to or higher than a predetermined voltage;
Automobile equipped with. The automobile according to claim 1,
The second booster circuit is connected in a reverse direction to a first switching element having a positive terminal connected to a positive terminal of the driving circuit, and to a positive terminal and a negative terminal of the first switching element. The positive electrode terminal is connected to the negative electrode side terminal of the first diode and the first switching element, and the negative electrode of the second battery is connected to the negative electrode side connection terminal of the drive circuit and the second connection release means. A second switching element connected; a second diode connected in a reverse direction to a positive terminal and a negative terminal of the second switching element; a negative terminal of the first switching element; A reactor in which one terminal is connected to the positive terminal of the switching element 2 and the positive terminal of the second battery is connected to the other terminal through the second connection release means. It is obtain circuit,
The abnormality determining means is means for determining an abnormality caused by the on-fixing of the first switching element as an abnormality of the second booster circuit.
Automobile. The automobile according to claim 1 or 2,
When the abnormality determining means determines that an abnormality has occurred in the second booster circuit, the first connection releasing means releases the connection between the first battery and the first booster circuit and stops the system. Time control means,
Automobile equipped with. The automobile according to claim 3,
The abnormal time control means is means for prohibiting the next system activation,
Automobile. The automobile according to claim 3,
The abnormal time control means permits permission of connection between the first battery and the first booster circuit by the first connection release means and prohibition of boosting by the first booster circuit as evacuation travel at the next system startup. It is a means to permit running as a condition,
Automobile. The automobile according to any one of claims 1 to 5,
The second battery is a plurality of batteries,
The second connection release means is a plurality of connection release means for connecting each of the plurality of batteries to the second booster circuit and releasing the connection.
Automobile. The automobile according to any one of claims 1 to 6,
An internal combustion engine;
A generator capable of inputting and outputting power;
A planetary gear mechanism in which three rotating elements are connected to three axes of a driving shaft coupled to an axle, an output shaft of the internal combustion engine, and a rotating shaft of the generator;
With
The electric motor is attached to input and output power to the drive shaft.
Automobile. An electric motor capable of inputting / outputting driving power; a driving circuit for driving the electric motor; a first battery capable of charging / discharging; and a first circuit for boosting electric power from the first battery and supplying the boosted electric power to the driving circuit. 1 booster circuit, first connection release means for connecting and releasing the first battery and the first booster circuit, a chargeable / dischargeable second battery, and boosting power from the second battery The second booster circuit in the automobile, comprising: a second booster circuit that supplies the drive circuit to the driver circuit; and a second connection release unit that connects and disconnects the second battery and the second booster circuit. An abnormality determination method for determining an abnormality of
Voltage detecting means for detecting a voltage on the second battery side of the second booster circuit;
The first battery and the first booster circuit are connected by the first connection release means, and the second battery and the second booster circuit are disconnected by the second connection release means. Determining that an abnormality has occurred in the second booster circuit when the voltage on the second battery side of the two booster circuit is equal to or higher than a predetermined voltage;
Abnormality judgment method.

Images