JP4980686B2 - Electric power system, driving device including the electric power system, vehicle equipped with the electric power system, and control method for the electric power system - Google Patents

Description

  The present invention relates to an electric power system, a driving device including the electric power system, a vehicle equipped with the electric power system, a method of controlling the electric power system, and more specifically, an electric device, an electric storage device, and a plurality of switching elements. A drive circuit that drives the electrical device with the exchange of power with the power storage means by switching, and a plurality of switching elements of the drive circuit are gated when the voltage applied to the drive circuit is in a predetermined overvoltage state The present invention relates to a power system including a control means for controlling the drive circuit, a drive device including the power system, a vehicle equipped with the power system, and a control method for the power system.

Conventionally, as this type of power system, there are an inverter device, a rectifier that rectifies current from an AC input power source to make a DC power source, an inverter device that converts a DC power source obtained by rectification into an AC power source, and a DC power source. A DC discharge circuit that is connected between the terminals of the power supply and discharges the overvoltage, a voltage detection circuit that detects the DC voltage acting on the inverter device, and an AC input power supply that distinguishes the overvoltage from the DC voltage detected by the voltage detection circuit. The thing provided with the interruption | blocking circuit which interrupts | blocks from a rectifier is proposed (for example, refer patent document 1). In this system, when an overvoltage is determined, the AC input power supply is cut off from the rectifier and the control of the inverter device is continued, thereby quickly suppressing the overvoltage of the DC voltage acting on the inverter device.
JP-A-6-105456

  By the way, such a power system includes an overvoltage signal output circuit that outputs an overvoltage signal when the DC voltage exceeds a predetermined voltage, and an inverter based on the signal from the overvoltage signal output circuit and the DC voltage from the voltage detection circuit. Some determine whether the voltage acting on the device is in an overvoltage condition. In this case, in order to take a more appropriate countermeasure depending on whether or not the voltage acting on the inverter device is in an overvoltage state, it is possible to more appropriately determine whether or not an abnormality has occurred in the overvoltage signal output circuit. desired.

  The electric power system of the present invention, a driving apparatus equipped with the electric power system, a vehicle equipped with the electric power system, and a control method of the electric power system are based on whether or not the voltage applied to the driving circuit for driving the electric equipment exceeds a predetermined voltage. It is an object to more appropriately determine whether or not an abnormality has occurred in the signal output means for outputting.

  In order to achieve the above-described object, the power system, the drive apparatus including the power system, the vehicle equipped with the power system, and the control method of the power system of the present invention employ the following means.

The first power system of the present invention includes:
An electric device, a power storage means, a drive circuit that has a plurality of switching elements and drives the electrical equipment with the exchange of power with the power storage means by switching of the plurality of switching elements, and acts on the drive circuit A power system comprising control means for controlling the drive circuit so that a plurality of switching elements of the drive circuit are gate-cut when the voltage is in a predetermined overvoltage state,
Signal output means for outputting a signal based on whether or not a voltage acting on the drive circuit exceeds a first predetermined voltage;
Voltage detection means for detecting a voltage acting on the drive circuit;
Overvoltage state determination means for determining whether a voltage acting on the drive circuit is in the predetermined overvoltage state based on the output signal and the detected voltage;
An abnormality determining means for determining whether an abnormality has occurred in the signal output means based on at least the determination result by the overvoltage state determining means and the output signal;
It is a summary to provide.

  In the first electric power system of the present invention, an electric device is driven by exchanging electric power with the power storage means by switching between the signals output from the signal output means and the plurality of switching elements. Based on the voltage acting on the driving circuit and determining whether or not the voltage acting on the driving circuit is in a predetermined overvoltage state, and at least a signal based on the determination result and the signal output from the signal output means It is determined whether an abnormality has occurred in the output means. Therefore, since it is determined whether or not an abnormality has occurred in the signal output means depending on whether or not the voltage acting on the drive circuit is in a predetermined overvoltage state, it is further determined whether or not an abnormality has occurred in the signal output means. It can be determined appropriately. Here, the 1st electric power system of this invention can also be provided with the capacitor | condenser attached between the electric power buses of a drive circuit. In this case, the first predetermined voltage may be a voltage lower than the withstand voltage of the capacitor.

  In such a first power system of the present invention, the signal output means is a means for outputting an ON signal when a voltage applied to the drive circuit exceeds the first predetermined voltage, and the overvoltage state determination The means drives the driving when the signal output for the first predetermined time is an ON signal and the detected voltage exceeds the second predetermined voltage for the first predetermined time. The voltage acting on the circuit may be a means for determining that the predetermined overvoltage state is present. By so doing, it is possible to more appropriately determine whether or not the voltage acting on the drive circuit is in a predetermined overvoltage state. Here, the first predetermined time is a time from when the ON signal starts to be output from the signal output means until it is determined that the voltage acting on the drive circuit is in a predetermined overvoltage state. You can also Further, the second predetermined voltage may be the first predetermined voltage or a voltage in the vicinity thereof.

  In the first power system of the present invention, the signal output means is a means for outputting an ON signal when a voltage acting on the drive circuit exceeds the first predetermined voltage, and the abnormality determination When the voltage acting on the drive circuit is determined not to be in the predetermined overvoltage state by the overvoltage state determination unit, the means detects the detected voltage regardless of whether the output signal is an on signal. It may be a means for determining that an abnormality has occurred in the signal output means when the voltage is equal to or lower than a second predetermined voltage. By doing so, it is possible to more appropriately determine whether or not an abnormality has occurred in the signal output means when the voltage applied to the drive circuit is not in a predetermined overvoltage state. Here, the second predetermined voltage may be the first predetermined voltage or a voltage in the vicinity thereof.

  In the first power system of the present invention in which the signal output means is a means for outputting an ON signal when the voltage acting on the drive circuit exceeds the first predetermined voltage, the abnormality determination means includes: When it is determined by the overvoltage state determination means that the voltage applied to the drive circuit is in the predetermined overvoltage state, the signal output means when the output signal is an ON signal for a second predetermined time. It can also be a means for determining that an abnormality has occurred. When a discharge resistor is connected between the power bus connected to the drive circuit and the power storage means, when a voltage acting on the drive circuit is in a predetermined overvoltage state, a plurality of switching elements of the drive circuit are gated off As a result, the voltage acting on the drive circuit is gradually reduced with power consumption by the discharge resistor. In the first power system of the present invention, the signal output is performed after a second predetermined time elapses from when the ON signal starts to be output from the signal output means until the voltage applied to the drive circuit drops below the second predetermined voltage. When the signal output from the means is an ON signal, it is determined that an abnormality has occurred in the signal output means. That is, when the signal output from the signal output means is an ON signal despite the fact that the voltage acting on the drive circuit is predicted to be lower than the second predetermined voltage, an abnormality occurs in the signal output means. It is determined that As a result, when the voltage acting on the drive circuit is in a predetermined overvoltage state, it can be more appropriately determined whether or not an abnormality has occurred in the signal output means.

  In the first power system of the present invention in which the signal output means is a means for outputting an ON signal when the voltage acting on the drive circuit exceeds the first predetermined voltage, the abnormality determination means includes: When it is determined by the overvoltage state determination means that the voltage acting on the drive circuit is in the predetermined overvoltage state, the output is performed even though the detected voltage has dropped below the second predetermined voltage. The signal output means may be a means for determining that an abnormality has occurred when the signal is an ON signal. By doing so, it is possible to more appropriately determine whether or not an abnormality has occurred in the signal output means when the voltage acting on the drive circuit is in a predetermined overvoltage state.

The second power system of the present invention is:
An electric power system comprising: an electric device; an electric storage unit; and a drive circuit that drives the electric device with the exchange of electric power with the electric storage unit,
Signal output means for outputting a signal based on whether or not a voltage acting on the drive circuit exceeds a first predetermined voltage;
Voltage detection means for detecting a voltage acting on the drive circuit;
Overvoltage state determination means for determining whether a voltage acting on the drive circuit is in the predetermined overvoltage state based on the output signal and the detected voltage;
An abnormality determining means for determining whether an abnormality has occurred in the signal output means based on at least the determination result by the overvoltage state determining means and the output signal;
It is a summary to provide.

  In the second power system of the present invention, the drive circuit is based on the signal output from the signal output means and the voltage acting on the drive circuit that drives the electrical device with the exchange of power with the power storage means. It is determined whether the applied voltage is in a predetermined overvoltage state, and it is determined whether an abnormality has occurred in the signal output means based on at least the determination result and the signal output from the signal output means. Therefore, since it is determined whether or not an abnormality has occurred in the signal output means depending on whether or not the voltage acting on the drive circuit is in a predetermined overvoltage state, it is further determined whether or not an abnormality has occurred in the signal output means. It can be determined appropriately. Here, a capacitor attached between the power buses of the drive circuit may be provided. In this case, the first predetermined voltage may be a voltage lower than the withstand voltage of the capacitor.

  The drive device of the present invention is a drive device that drives a drive shaft, and is the first or second power system of the present invention according to any one of the above-described aspects, that is, basically an electric device and a power storage means. A drive circuit that has a plurality of switching elements and drives the electrical device with power exchange with the power storage means by switching of the plurality of switching elements, and a voltage acting on the drive circuit is in a predetermined overvoltage state A power system comprising control means for controlling the drive circuit so that the plurality of switching elements of the drive circuit are gated, and whether the voltage acting on the drive circuit exceeds a first predetermined voltage A signal output means for outputting a signal based on whether or not, a voltage detection means for detecting a voltage acting on the drive circuit, the output signal and the detected voltage, Based on an overvoltage state determination means for determining whether or not a voltage acting on the drive circuit is in the predetermined overvoltage state, based on at least a determination result by the overvoltage state determination means and the output signal An electric power system including an abnormality determination unit that determines whether or not an abnormality has occurred in the output unit, an electric device, a power storage unit, and a drive that drives the electric device with the exchange of electric power with the power storage unit A signal output means for outputting a signal based on whether or not a voltage applied to the drive circuit exceeds a first predetermined voltage, and a voltage applied to the drive circuit. Based on the detected voltage detection means and the output signal and the detected voltage, it is determined whether or not a voltage acting on the drive circuit is in the predetermined overvoltage state. An electric power system comprising: an overvoltage state determination unit; and an abnormality determination unit that determines whether an abnormality has occurred in the signal output unit based on at least a determination result by the overvoltage state determination unit and the output signal. And the electrical device is an electric motor capable of outputting power to the drive shaft.

  Since the driving device of the present invention is equipped with the first or second power system of the present invention according to any one of the above-described aspects, the effects exhibited by the first or second power system of the present invention, for example, signal output It is possible to achieve the same effect as the effect of more appropriately determining whether or not an abnormality has occurred in the means.

  In such a drive device of the present invention, the control means causes the drive circuit to output power to the drive shaft with power consumption of the motor when it is determined that an abnormality has occurred in the signal output means. It can also be a means for controlling. In this way, even when an abnormality occurs in the signal output means, power can be output to the drive shaft with power consumption of the motor.

  The gist of the vehicle of the present invention is that the drive device according to any one of the above-described aspects is mounted, and the axle is connected to the drive shaft. Since the vehicle according to the present invention is equipped with the drive device according to any one of the above-described aspects, it is possible to more appropriately determine whether the drive device according to the present invention has an effect, for example, whether or not an abnormality has occurred in the signal output means. The same effects as those that can be determined can be achieved.

The power system control method of the present invention includes:
An electric device, a power storage means, a drive circuit that has a plurality of switching elements and drives the electrical equipment with the exchange of power with the power storage means by switching of the plurality of switching elements, and acts on the drive circuit A signal output means for outputting a signal based on whether or not the voltage exceeds a first predetermined voltage; and a plurality of switching elements of the drive circuit are gated when a voltage acting on the drive circuit is in a predetermined overvoltage state A control method of a power system comprising control means for controlling the drive circuit,
(A) determining whether a voltage applied to the drive circuit is in the predetermined overvoltage state based on a signal output from the signal output means and a voltage applied to the drive circuit;
(B) determining whether or not an abnormality has occurred in the signal output means based on at least the determination result and the signal output from the signal output means;
This is the gist.

  In the control method of the power system of the present invention, the electric device is driven by exchanging electric power with the power storage means by switching between the signals output from the signal output means and the plurality of switching elements. Based on the voltage acting on the driving circuit and determining whether or not the voltage acting on the driving circuit is in a predetermined overvoltage state, and at least a signal based on the determination result and the signal output from the signal output means It is determined whether an abnormality has occurred in the output means. Therefore, since it is determined whether or not an abnormality has occurred in the signal output means depending on whether or not the voltage acting on the drive circuit is in a predetermined overvoltage state, it is further determined whether or not an abnormality has occurred in the signal output means. It can be determined appropriately. Here, the electric power system of the present invention may include a capacitor attached between the electric power buses of the drive circuit. In this case, the first predetermined voltage may be a voltage lower than the withstand voltage of the capacitor.

  Next, the best mode for carrying out the present invention will be described using examples.

  FIG. 1 is a configuration diagram showing an outline of the configuration of a hybrid vehicle 20 equipped with a driving apparatus according to an embodiment of the present invention. As shown in the figure, the hybrid vehicle 20 of the embodiment includes an engine 22, a three-shaft power distribution / integration mechanism 30 connected to a crankshaft 26 as an output shaft of the engine 22 via a damper 28, and power distribution / integration. Motor MG1 as an electric device connected to mechanism 30, motor MG2 as an electric device connected to ring gear shaft 32a as a drive shaft connected to power distribution and integration mechanism 30 via reduction gear 35, and motor MG1 , MG2 inverters 41, 42, a battery 50 that exchanges power with the motors MG1, MG2 via the inverters 41, 42 and the power line 54, and a voltage acting on the inverters 41, 42 exceeds a predetermined voltage Vref. Overvoltage signal output circuit 90 that outputs a signal according to whether or not, and control the entire vehicle That a hybrid electronic control unit 70. Here, the predetermined voltage Vref is determined by the rating of the capacitor 46 attached to the inverters 41 and 42, the battery 50, and the positive bus 54a and the negative bus 54b of the power line 54, for example, a voltage less than the withstand voltage of the capacitor 46. Can be set as

  The engine 22 is an internal combustion engine that outputs power using a hydrocarbon-based fuel such as gasoline or light oil, and an engine electronic control unit (hereinafter referred to as an engine ECU) that receives signals from various sensors that detect the operating state of the engine 22. ) 24 is subjected to operation control such as fuel injection control, ignition control, intake air amount adjustment control and the like. The engine ECU 24 is in communication with the hybrid electronic control unit 70, controls the operation of the engine 22 by a control signal from the hybrid electronic control unit 70, and, if necessary, transmits data related to the operating state of the engine 22 to the hybrid electronic control. Output to unit 70.

  The power distribution and integration mechanism 30 includes an external gear sun gear 31, an internal gear ring gear 32 arranged concentrically with the sun gear 31, a plurality of pinion gears 33 that mesh with the sun gear 31 and mesh with the ring gear 32, A planetary gear mechanism is provided that includes a carrier 34 that holds a plurality of pinion gears 33 so as to rotate and revolve, and that performs differential action using the sun gear 31, the ring gear 32, and the carrier 34 as rotational elements. In the power distribution and integration mechanism 30, the crankshaft 26 of the engine 22 is connected to the carrier 34, the motor MG1 is connected to the sun gear 31, and the reduction gear 35 is connected to the ring gear 32 via the ring gear shaft 32a. When functioning as a generator, power from the engine 22 input from the carrier 34 is distributed according to the gear ratio between the sun gear 31 side and the ring gear 32 side, and when the motor MG1 functions as an electric motor, the engine input from the carrier 34 The power from 22 and the power from the motor MG1 input from the sun gear 31 are integrated and output to the ring gear 32 side. The power output to the ring gear 32 is finally output from the ring gear shaft 32a to the drive wheels 63a and 63b of the vehicle via the gear mechanism 60 and the differential gear 62.

  FIG. 2 is a configuration diagram showing an outline of the configuration of the electric drive system centered on the motors MG1 and MG2. Each of the motors MG1 and MG2 is configured as a well-known PM-type synchronous generator motor including a rotor having a permanent magnet attached to an outer surface and a stator around which a three-phase coil is wound. Motors MG1 and MG2 exchange power with battery 50 through inverters 41 and 42. The power line 54 connecting the inverters 41 and 42 and the battery 50 is configured as a positive electrode bus 54a and a negative electrode bus 54b shared by the inverters 41 and 42, and generates electric power generated by one of the motors MG1 and MG2. It can be consumed by other motors. Therefore, battery 50 is charged / discharged by electric power generated from one of motors MG1 and MG2 or insufficient electric power. A smoothing capacitor 46 and a discharge resistor 48 are connected in parallel to the positive electrode bus 54 a and the negative electrode bus 54 b of the power line 54. The inverter 41 includes six transistors T1 to T6 and six diodes D1 to D6. The six transistors T1 to T6 are arranged in pairs so that they are on the source side and the sink side with respect to the positive electrode bus 54a and the negative electrode bus 54b of the power line 54, and the three-phase of the motor MG1 is connected to the connection point. Each of the coils (U phase, V phase, W phase) is connected. Six diodes D1 to D6 are connected in antiparallel to the six transistors T1 to T6, respectively. Therefore, a rotating magnetic field is formed in the three-phase coil by controlling the on-time ratio of the paired transistors T1 to T6 in a state where a voltage is applied between the positive electrode bus 54a and the negative electrode bus 54b of the power line 54. The motor MG1 can be rotationally driven. The inverter 42 includes six transistors T7 to T12 and six diodes D7 to D12. The six transistors T7 to T12 are arranged in pairs so as to be on the source side and the sink side with respect to the positive electrode bus 54a and the negative electrode bus 54b of the inverter circuit 42, and at the connection point, the three phases of the motor MG2 Each of the coils (U phase, V phase, W phase) is connected. Six diodes D7 to D12 are connected in antiparallel to the six transistors T7 to T12, respectively. Therefore, a rotating magnetic field is formed in the three-phase coil by controlling the on-time ratio of the paired transistors T7 to T12 in a state where a voltage is acting between the positive electrode bus 54a and the negative electrode bus 54b of the power line 54. The motor MG2 can be rotationally driven. The motors MG1 and MG2 are both driven and controlled by a motor electronic control unit (hereinafter referred to as a motor ECU) 40. The motor ECU 40 is configured as a microprocessor centered on the CPU 40a. In addition to the CPU 40a, a ROM 40b that stores a processing program, a RAM 40c that temporarily stores data, a timer 40d that measures time based on instructions, Input / output port and communication port. The motor ECU 40 receives signals necessary for driving and controlling the motors MG1 and MG2, such as signals from rotational position detection sensors 43 and 44 that detect the rotational positions of the rotors of the motors MG1 and MG2, and the motors MG1 and MG2. A phase current from a current sensor for detecting a phase current flowing in each phase of the three-phase coil, a capacitor voltage Vc from a voltage sensor 47 for detecting the voltage of the capacitor 46, and the like are input. An inverter 41, Switching control signals to 42 transistors T1 to T6 and T7 to T12 are output. The motor ECU 40 is in communication with the hybrid electronic control unit 70, controls the driving of the motors MG1 and MG2 by a control signal from the hybrid electronic control unit 70, and, if necessary, data on the operating state of the motors MG1 and MG2. Output to the hybrid electronic control unit 70.

  The overvoltage signal output circuit 90 is connected to the comparator 92 that inputs the capacitor voltage Vc and the predetermined voltage Vref from the input terminal, to the output terminal of the comparator 92 via the resistor 94, and to the ground via the capacitor 96. And an output signal to the motor ECU 40 when the capacitor voltage Vc is higher than the predetermined voltage Vref, and an output signal to the motor ECU 40 when the capacitor voltage Vc is equal to or lower than the predetermined voltage Vref. The predetermined voltage Vref has been described above.

  As shown in FIG. 1, the battery 50 is managed by a battery electronic control unit (hereinafter referred to as a battery ECU) 52. The battery ECU 52 receives signals necessary for managing the battery 50, for example, a voltage between terminals from a voltage sensor (not shown) installed between terminals of the battery 50, and a power line 54 connected to the output terminal of the battery 50. The charging / discharging current from the attached current sensor (not shown), the battery temperature Tb from the temperature sensor 51 attached to the battery 50, and the like are input. Output to the control unit 70. The battery ECU 52 also calculates the remaining capacity (SOC) based on the integrated value of the charge / discharge current detected by the current sensor in order to manage the 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 an ignition signal from an ignition switch 80, a shift position SP from a shift position sensor 82 that detects the operation position of the shift lever 81, and an accelerator pedal position sensor 84 that detects the amount of depression of the accelerator pedal 83. The accelerator pedal opening Acc from the vehicle, the brake pedal position BP from the brake pedal position sensor 86 for detecting the depression amount of the brake pedal 85, the vehicle speed V from the vehicle speed sensor 88, and the like are input via the input port. As described above, the hybrid electronic control unit 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. ing.

  The hybrid vehicle 20 of the embodiment thus configured calculates the required torque to be output to the ring gear shaft 32a as the drive shaft based on the accelerator opening Acc and the vehicle speed V corresponding to the depression amount of the accelerator pedal 83 by the driver. Then, the operation of the engine 22, the motor MG1, and the motor MG2 is controlled so that the required power corresponding to the required torque is output to the ring gear shaft 32a. As operation control of the engine 22, the motor MG1, and the motor MG2, the operation of the engine 22 is controlled so that power corresponding to the required power is output from the engine 22, and all of the power output from the engine 22 is the power distribution and integration mechanism 30. Torque conversion operation mode for driving and controlling the motor MG1 and the motor MG2 so that the torque is converted by the motor MG1 and the motor MG2 and output to the ring gear shaft 32a, and the required power and the power required for charging and discharging the battery 50. The engine 22 is operated and controlled so that suitable power is output from the engine 22, and all or part of the power output from the engine 22 with charging / discharging of the battery 50 is the power distribution and integration mechanism 30, the motor MG1, and the motor. The required power is converted to the ring gear shaft 32 with torque conversion by MG2. Charge / discharge operation mode in which the motor MG1 and the motor MG2 are driven and controlled to be output to each other, and a motor operation mode in which the operation of the engine 22 is stopped and the power corresponding to the required power from the motor MG2 is output to the ring gear shaft 32a. and so on.

  Next, the operation of the hybrid vehicle 20 of the embodiment thus configured, particularly the operation when determining an abnormality in the overvoltage signal output circuit 90 will be described. FIG. 3 is a flowchart showing an example of an abnormality determination routine executed by the motor ECU 40. This routine is repeatedly executed every predetermined time (for example, every several msec).

  When the abnormality determination routine is executed, the CPU 42 of the motor ECU 40 first executes a process of inputting the signal from the overvoltage signal output circuit 90 and the capacitor voltage Vc from the voltage sensor 47 (step S100). The value of the overvoltage state determination flag F is checked (step S110). Here, the overvoltage state determination flag F is a flag indicating whether or not the voltage applied to the inverters 41 and 42 is in an overvoltage state. The value 0 is set when the voltage applied to the inverters 41 and 42 is not in the overvoltage state. When the voltage applied to the inverters 41 and 42 is in an overvoltage state, the flag is set to a value of 1. In the embodiment, an ON signal is output from the overvoltage signal output circuit 90 over time tref1, and it is determined that the voltage acting on the inverters 41 and 42 is in an overvoltage state when the capacitor voltage Vc is higher than the predetermined voltage Vref. It was. Details of this point will be described later.

  When the overvoltage state determination flag F is 0, it is determined that the voltage applied to the inverters 41 and 42 is not in an overvoltage state, and it is checked whether the signal from the overvoltage signal output circuit 90 is an on signal or an off signal ( Step S120) When the signal from the overvoltage signal output circuit 90 is an off signal, the time t counted by the timer 40d is reset to stop the timer 40d (Step S130), and the value of the overvoltage state determination flag F is set. 0 is set (step S140), and the abnormality determination routine is terminated.

  On the other hand, when it is determined in step S120 that the signal from the overvoltage signal output circuit 90 is an ON signal, the capacitor voltage Vc is compared with a predetermined voltage Vref (step S150). Here, the predetermined voltage Vref has been described above. In the embodiment, the overvoltage signal output circuit is determined by the processing of steps S120 and S150, that is, by determining whether or not the capacitor voltage Vc is equal to or lower than the predetermined voltage Vref when the signal from the overvoltage signal output circuit 90 is an on signal. Whether or not an abnormality has occurred in 90 is determined. When the capacitor voltage Vc is higher than the predetermined voltage Vref, it is determined whether or not the timer 40d is measuring time (step S160), and when the time is not measured, the timing is started (step S170). Considering the case where the overvoltage state determination flag F is 0, when the signal from the overvoltage signal output circuit 90 is an off signal, the time t counted by the timer 40d is stopped in a reset state. , S170 is a process of starting the time measurement by the timer 40d when the signal from the overvoltage signal output circuit 90 is switched from the off signal to the on signal.

  Subsequently, the time t counted by the timer 40d, that is, the time t after the signal from the overvoltage signal output circuit 90 is switched from the off signal to the on signal is compared with the predetermined time tref1 (step S180), and the time t is predetermined. When the time is less than tref1, a value 0 is set in the overvoltage state determination flag F (step S140), and the abnormality determination routine is terminated. On the other hand, when the time t is equal to or longer than the predetermined time tref1, a value 1 is set in the overvoltage state determination flag F (step S190), and gate cutoff commands for the inverters 41 and 42 of the motors MG1 and MG2 are output (step S200). The abnormality determination routine ends. That is, when an ON signal is output from the overvoltage signal output circuit 90 for a predetermined time tref1 and the capacitor voltage Vc is higher than the predetermined voltage Vref, it is determined that the voltage acting on the inverters 41 and 42 is in an overvoltage state. is there. Here, the predetermined time tref1 is a period from when the signal from the overvoltage signal output circuit 90 is switched from the off signal to the on signal until it is determined that the voltage acting on the inverters 41 and 42 is in the overvoltage state. The time is determined by the ratings of the inverters 41 and 42, the battery 50, and the capacitor 46, and can be set to 200 msec, for example. When the gate cutoff command is output in this way, the transistors T1 to T6 and T7 to T12 of the inverters 41 and 42 are gated by a motor control routine (not shown).

  On the other hand, when the capacitor voltage Vc is equal to or lower than the predetermined voltage Vref in step S150, that is, when the capacitor voltage Vc is equal to or lower than the predetermined voltage Vref even though the signal from the overvoltage signal output circuit 90 is an ON signal, the overvoltage signal output circuit. 90 is determined that an abnormality has occurred (step S210), the overvoltage state determination flag F is set to 0 (step S220), and a gate cutoff command for the inverter 41 of the motor MG1 and a power generation prohibition command for the motor MG2 are issued. In step S230, the abnormality determination routine is terminated. By determining whether or not an abnormality has occurred in the overvoltage signal output circuit 90 as described above, whether or not an abnormality has occurred in the overvoltage signal output circuit 90 when the voltage acting on the inverters 41 and 42 is not in an overvoltage state. Can be determined more appropriately. When the gate shutoff command and the power generation prohibition command are output in this way, the gates of the transistors T1 to T6 of the inverter 41 are shut off by a motor control routine (not shown) and the transistors T7 to T7 of the inverter 42 are prevented from generating power by the motor MG2. Switching control of T12 is performed. The reason why the motor MG2 is controlled in this way when an abnormality occurs in the overvoltage signal output circuit 90 is as follows. In the embodiment, as described above, when the overvoltage state determination flag F is 0, is the voltage acting on the inverters 41 and 42 based on the signal from the overvoltage signal output circuit 90 and the capacitor voltage Vc in an overvoltage state? It is determined whether or not. Therefore, when an abnormality occurs in the overvoltage signal output circuit 90, it cannot be determined whether or not the voltage acting on the inverters 41 and 42 is in an overvoltage state. At this time, when power is generated by the motor MG2, the voltage acting on the inverters 41 and 42 increases, but it is not possible to determine whether or not the voltage acting on the inverters 41 and 42 is in an overvoltage state. Arise. In the embodiment, in order to avoid such inconvenience, when the overvoltage signal output circuit 90 is abnormal, the power generation by the motor MG2 is limited. At this time, power can be output to the ring gear shaft 32a as the drive shaft with power consumption of the motor MG2, so that the vehicle can travel using the power from the motor MG2.

  When the overvoltage state determination flag F is 1 in step S110, it is determined whether or not the signal from the overvoltage signal output circuit 90 is an on signal (step S240), and the signal from the overvoltage signal output circuit 90 is an off signal. In some cases, it is determined that the voltage applied to the inverters 41 and 42 is no longer in the overvoltage state, the time counted by the timer 40d is reset and the timer 40d is stopped (step S130), and the value of the overvoltage state determination flag F is set. 0 is set (step S140), and the abnormality determination routine is terminated. At this time, since the gate cutoff command for the inverters 41 and 42 of the motors MG1 and MG2 is not output, the motors MG1 and MG2 are controlled according to the traveling state of the vehicle.

  On the other hand, when the signal from the overvoltage signal output circuit 90 is an on signal in step S240, the time t counted by the timer 40d, that is, the time after the signal from the overvoltage signal output circuit 90 is switched from the off signal to the on signal. t is compared with a predetermined time tref2 (step S250). When the voltage applied to the inverters 41 and 42 is in an overvoltage state, as described above, the transistors T1 to T6 and T7 to T12 of the inverters 41 and 42 are gated, so that the energy stored in the capacitor 46 is discharged. Consumed by the resistor 48, the capacitor voltage Vc gradually decreases. In the embodiment, the time from when the signal from the overvoltage signal output circuit 90 switches from the off signal to the on signal until the capacitor voltage Vc drops below the predetermined voltage Vref or a slightly longer time is set as the predetermined time tref2. It was supposed to be. The predetermined time tref2 can be determined by experiments or the like based on the ratings of the inverters 41 and 42, the battery 50, and the capacitor 46, and can be set to 400 msec, for example. When the time t is less than the predetermined time tref2, it is determined that the voltage acting on the inverters 41 and 42 is in an overvoltage state, a value 1 is set in the overvoltage state determination flag F (step S190), and the inverter 41 of the motors MG1 and MG2 is set. , 42 are output (step S200), and the abnormality determination routine is terminated. On the other hand, when the time t is equal to or greater than the predetermined time tref2, it is determined that the ON signal is output from the overvoltage signal output circuit 90 despite the fact that the capacitor voltage Vc is predicted to decrease below the predetermined voltage Vref. It is determined that an abnormality has occurred in the overvoltage signal output circuit 90 (step S230), the value 0 is set in the overvoltage state determination flag F (step S240), the gate cutoff command for the inverter 41 of the motor MG1 and the power generation prohibition of the motor MG2 are prohibited. A command is output (step S250), and the abnormality determination routine is terminated. In this way, by determining whether or not the overvoltage signal output circuit 90 is abnormal, it is determined whether or not there is an abnormality in the overvoltage signal output circuit 90 when the voltage applied to the inverters 41 and 42 is in an overvoltage state. It can be performed more appropriately. When the abnormality determination routine is executed after the next time, it is determined in step S110 that the overvoltage state determination flag F is 0, the overvoltage signal output circuit 90 is an ON signal, and the capacitor voltage Vc is less than or equal to the threshold value Vref. (Steps S120 and S150), and the processing after Step S210 is executed. This is because it is determined that the ON signal is output from the overvoltage signal output circuit 90 even though the capacitor voltage Vc is predicted to be lower than the predetermined voltage Vref, and an abnormality occurs in the overvoltage signal output circuit 90. When it is determined that the inverter 41 of the motor MG1 is gated and the motor MG2 is prohibited from generating power, the capacitor voltage Vc normally rises and is unlikely to exceed the predetermined voltage Vref. Based.

  4 shows the capacitor voltage Vc, the signal from the overvoltage signal output circuit 90, the overvoltage state determination flag F, the determination as to whether or not an abnormality has occurred in the overvoltage signal output circuit 90, and the inverters 41 and 42 of the motors MG1 and MG2 are gated. It is explanatory drawing which shows an example of the mode of a time change with whether it is interrupted | blocked. First, when the capacitor voltage Vc exceeds the predetermined voltage Vref at time t1, the signal from the overvoltage signal output circuit 90 is switched from the off signal to the on signal. When the ON signal is output from the overvoltage signal output circuit 90 for a predetermined time tref1 from time t1 and the capacitor voltage Vc is higher than the predetermined voltage Vref, the inverter 41, at time t2 after the elapse of the predetermined time tref1 from time t1. It is determined that the voltage applied to 42 is in an overvoltage state, the value 1 is set in the overvoltage state determination flag F, and the gates of the transistors T1 to T6 and T7 to T12 of the inverters 41 and 42 are shut off. Thereafter, when the signal from the overvoltage signal output circuit 90 is an ON signal even at time t3 when the predetermined time tref2 has elapsed from time t1, it is determined that an abnormality has occurred in the overvoltage signal output circuit 90, and the motor MG2 The gate cut-off of the inverter 42 is released and the torque output from the motor MG2 is permitted. Thus, even when it is determined that an abnormality has occurred in the overvoltage signal output circuit 90, the vehicle can travel with the power from the motor MG2.

  According to the hybrid vehicle 20 of the embodiment described above, when the voltage acting on the inverters 41 and 42 is not in an overvoltage state, the overvoltage signal output circuit 90 is abnormal based on the signal from the overvoltage signal output circuit 90 and the capacitor voltage Vc. From the overvoltage signal output circuit 90 when the voltages acting on the inverters 41 and 42 are in an overvoltage state and the transistors T1 to T6 and T7 to T12 of the inverters 41 and 42 are shut off. Therefore, it is determined whether or not an abnormality has occurred in the overvoltage signal output circuit 90 based on this signal. Therefore, an abnormality has occurred in the overvoltage signal output circuit 90 depending on whether or not the voltage applied to the inverters 41 and 42 is in an overvoltage state. It can be determined more appropriately whether or not it has occurred. When it is determined that an abnormality has occurred in the overvoltage signal output circuit 90, the gate of the inverter 42 of the motor MG2 is not shut off, so that the vehicle can travel using the power from the motor MG2.

  In the hybrid vehicle 20 of the embodiment, when the overvoltage state determination flag F is 1, the time t after the signal from the overvoltage signal output circuit 90 and the signal from the overvoltage signal output circuit 90 are switched from the off signal to the on signal are However, the present invention is not limited to this. For example, the overvoltage signal output circuit 90 outputs the overvoltage signal based on the signal from the overvoltage signal output circuit 90 and the capacitor voltage Vc. It may be determined whether or not an abnormality has occurred in the circuit 90. An example of the abnormality determination routine in this case is shown in FIG. The abnormality determination routine of FIG. 5 is the same as the abnormality determination routine of FIG. 3 except that the process of step S300 is performed instead of the process of step S250 of the abnormality determination routine of FIG. Therefore, the same process is given the same step number, and detailed description thereof is omitted. When the overvoltage state determination flag F is 1 in step S120, it is determined whether or not the signal from the overvoltage signal output circuit 90 is an on signal (step S240), and the capacitor voltage Vc is compared with a predetermined voltage Vref (step S240). Step S300). When the signal from the overvoltage signal output circuit 90 is an ON signal and the capacitor voltage Vc is higher than the predetermined voltage Vref, a value 1 is set in the overvoltage state determination flag F (step 190), and the inverter 41 of the motors MG1 and MG2 is set. , 42 are output (step S200), and the abnormality determination routine is terminated. On the other hand, when the capacitor voltage Vc drops below the predetermined voltage Vref even though the signal from the overvoltage signal 90 is an ON signal, that is, the overvoltage signal is output even though the capacitor voltage Vc drops below the predetermined voltage Vref. When the signal from the circuit 90 does not switch from the on signal to the off signal, it is determined that an abnormality has occurred in the overvoltage signal output circuit 90 (step 210), and a value 0 is set in the overvoltage state determination flag F (step S220). Then, the gate cutoff command for the inverter 41 of the motor MG1 and the power generation prohibition command for the motor MG2 are output (step S230), and the abnormality determination routine ends. Even in this case, the abnormality determination of the overvoltage signal output circuit 90 can be performed more appropriately as in the embodiment.

  In the hybrid vehicle 20 of the embodiment, when it is determined that an abnormality has occurred in the overvoltage signal output circuit 90, the gate of the inverter 42 of the motor MG2 is not shut off, but the gate of the inverter 42 of the motor MG2 is shut off. It may be done.

  In the hybrid vehicle 20 of the embodiment, based on the signal output from the overvoltage signal output circuit 90 based on whether or not the capacitor voltage Vc is higher than the predetermined voltage Vref, and the result of comparing the capacitor voltage Vc with the predetermined voltage Vref. In this case, it is determined whether or not the voltage acting on the inverters 41 and 42 is in an overvoltage state. However, the predetermined voltage Vref used in the comparison between the predetermined voltage Vref used in the overvoltage output circuit 90 and the capacitor voltage Vc Are not limited to the same voltage. For example, a voltage that is slightly higher than the voltage used in the overvoltage signal output circuit 90 may be used.

  In the hybrid vehicle 20 of the embodiment, the battery 50 is connected to the inverters 41 and 42 of the motors MG1 and MG2 via the power line 54. However, as illustrated in the hybrid vehicle 120 of the modified example of FIG. , 42 may be connected to the battery 50 via the booster circuit 130 in addition to the power line 54. In the case of this modification, as shown in FIG. 6, an overvoltage signal output circuit 90 that outputs a signal based on the voltage of the capacitor 46 on the inverters 41 and 42 side than the booster circuit 130 may be provided. Alternatively or in addition, an overvoltage signal output circuit 90b (not shown) that outputs a signal based on the voltage of the capacitor 48 on the battery 50 side of the booster circuit 130 may be provided.

  In the hybrid vehicle 20 of the embodiment, the power of the motor MG2 is shifted by the reduction gear 35 and output to the ring gear shaft 32a. However, as illustrated in the hybrid vehicle 220 of the modified example of FIG. May be connected to an axle (an axle connected to the wheels 64a and 64b in FIG. 7) different from an axle to which the ring gear shaft 32a is connected (an axle to which the drive wheels 63a and 63b are connected).

  In the hybrid vehicle 20 of the embodiment, the power of the engine 22 is output to the ring gear shaft 32a as the drive shaft connected to the drive wheels 63a and 63b via the power distribution and integration mechanism 30, but the modified example of FIG. The hybrid vehicle 320 includes an inner rotor 332 connected to the crankshaft 26 of the engine 22 and an outer rotor 334 connected to a drive shaft that outputs power to the drive wheels 63a and 63b. A counter-rotor electric motor 330 that transmits a part of the power to the drive shaft and converts the remaining power into electric power may be provided.

  In the embodiment, the present invention is applied to a hybrid vehicle that travels using the power from the engine 22 and the power from the motor MG2. However, the present invention is applied to an electric vehicle that does not include an engine and travels only by the power from the motor. It is good.

  Further, the present invention is not limited to those applied to hybrid vehicles and electric vehicles, but is incorporated in non-moving equipment such as driving devices mounted on moving bodies such as vehicles other than automobiles, ships, and aircraft, and construction equipment. It may be in the form of a drive device.

  In the embodiment, the motors MG1 and MG2 are used as the electrical devices. However, the present invention is not limited to two motors, and any device that uses at least one motor may be used. Further, the electric device is not limited to a motor, and any device that consumes electric power or any device that generates or regenerates electric power may be used.

  The best mode for carrying out the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention. Of course, it can be implemented in the form.

  INDUSTRIAL APPLICABILITY The present invention can be used in an electric power system, a drive device including the power system, a manufacturing industry of a vehicle equipped with the same.

1 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 20 as an embodiment of the present invention. It is a block diagram which shows the outline of a structure of the electric drive system centering on motor MG1, MG2. It is explanatory drawing which shows an example of the abnormality determination routine performed by motor ECU40. Capacitor voltage Vc, signal from overvoltage signal output circuit 90, overvoltage state determination flag F, determination of whether or not abnormality has occurred in overvoltage signal output circuit 90, and whether inverters 41 and 42 of motors MG1 and MG2 are gate-cut off It is explanatory drawing which shows an example of the mode of a time change with no. It is explanatory drawing which shows an example of the abnormality determination routine performed by motor ECU40 of a modification. 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 showing an outline of a configuration of a hybrid vehicle 320 of a modified example.

Explanation of symbols

  20, 120, 220, 320 Hybrid vehicle, 22 engine, 24 engine electronic control unit (engine ECU), 26 crankshaft, 28 damper, 30 power distribution integration mechanism, 31 sun gear, 32 ring gear, 32a ring gear shaft, 33 pinion gear, 34 carrier, 35 reduction gear, 40 motor electronic control unit (motor ECU), 40a CPU, 40b ROM, 40c RAM, 40d timer, 41, 42 inverter, 43, 44 rotational position detection sensor, 46, 48 capacitor, 47 voltage Sensor, 50 battery, 51 temperature sensor, 52 battery electronic control unit (battery ECU), 54 power line, 60 gear mechanism, 62 differential gear, 63a, 63b driving wheel, 64a, 64b Wheel, 70 Hybrid electronic control unit, 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 Overvoltage signal output circuit, 92 Comparator, 94 Resistance, 96 capacitor, 98 Output terminal, 330 Pair motor, 332 Inner rotor 334 Outer rotor, MG1, MG2 motor, T1-T12 transistor, D1-D12 diode .

Claims (9)

An electric device, a power storage means, a drive circuit that has a plurality of switching elements and drives the electrical equipment with the exchange of power with the power storage means by switching of the plurality of switching elements, and acts on the drive circuit A power system comprising control means for controlling the drive circuit so that a plurality of switching elements of the drive circuit are gate-cut when the voltage is in a predetermined overvoltage state,
A signal output means for outputting an ON signal when a voltage acting on the drive circuit exceeds a first predetermined voltage;
Voltage detection means for detecting a voltage acting on the drive circuit;
Overvoltage state determination means for determining whether a voltage acting on the drive circuit is in the predetermined overvoltage state based on the output signal and the detected voltage;
An abnormality determining means for determining whether an abnormality has occurred in the signal output means based on at least the determination result by the overvoltage state determining means and the output signal;
Equipped with a,
The overvoltage state determination means is configured such that the output signal is an ON signal over a first predetermined time and the detected voltage exceeds a second predetermined voltage over the first predetermined time. A power system that is means for determining that a voltage acting on the drive circuit is sometimes in the predetermined overvoltage state . An electric device, a power storage means, a drive circuit that has a plurality of switching elements and drives the electrical equipment with the exchange of power with the power storage means by switching of the plurality of switching elements, and acts on the drive circuit A power system comprising control means for controlling the drive circuit so that a plurality of switching elements of the drive circuit are gate-cut when the voltage is in a predetermined overvoltage state,
A signal output means for outputting an ON signal when a voltage acting on the drive circuit exceeds a first predetermined voltage;
Voltage detection means for detecting a voltage acting on the drive circuit;
Overvoltage state determination means for determining whether a voltage acting on the drive circuit is in the predetermined overvoltage state based on the output signal and the detected voltage;
An abnormality determining means for determining whether an abnormality has occurred in the signal output means based on at least the determination result by the overvoltage state determining means and the output signal;
With
When the overvoltage state determination unit determines that the voltage applied to the drive circuit is not in the predetermined overvoltage state, the abnormality determination unit detects the detection even though the output signal is an on signal. A power system that is means for determining that an abnormality has occurred in the signal output means when the measured voltage is equal to or lower than a second predetermined voltage . The abnormality determination unit is configured to turn on the output signal for a second predetermined time when the voltage applied to the drive circuit is determined to be in the predetermined overvoltage state by the overvoltage state determination unit. 3. The power system according to claim 2 , wherein the power system is means for determining that an abnormality has occurred in the signal output means at a certain time. The abnormality determining means determines that the detected voltage has dropped below the second predetermined voltage when the voltage applied to the drive circuit is determined to be in the predetermined overvoltage state by the overvoltage state determining means. 3. The power system according to claim 2 , wherein the power system is a means for determining that an abnormality has occurred in the signal output means when the output signal is an ON signal. A drive device for driving a drive shaft,
A power system according to any one of claims 1 to 4 ,
The electric device is an electric motor capable of outputting power to the drive shaft. The control means is means for controlling the drive circuit so that power is output to the drive shaft with power consumption of the motor when it is determined that an abnormality has occurred in the signal output means. 5. The drive device according to 5 . A vehicle comprising the drive device according to claim 5 or 6 and an axle connected to the drive shaft. An electric device, a power storage means, a drive circuit that has a plurality of switching elements and drives the electrical equipment with the exchange of power with the power storage means by switching of the plurality of switching elements, and acts on the drive circuit Signal output means for outputting an ON signal when the voltage exceeds the first predetermined voltage, and a plurality of switching elements of the drive circuit are gated when the voltage applied to the drive circuit is in a predetermined overvoltage state And a control means for controlling the drive circuit.
A step voltage that acts on the drive circuit to determine whether the predetermined overvoltage condition (a) on the basis of the voltage acting on the signal output from said signal output means and said driving circuit,
(B) determining whether an abnormality has occurred in the signal output means based on at least the determination result and the signal output from the signal output means ;
Including
In the step (a), the signal output for the first predetermined time is an ON signal, and the voltage acting on the drive circuit for the first predetermined time exceeds the second predetermined voltage. A control method of the power system, which is a step of determining that the voltage acting on the drive circuit is in the predetermined overvoltage state when   An electric device, a power storage means, a drive circuit that has a plurality of switching elements and drives the electrical equipment with the exchange of power with the power storage means by switching of the plurality of switching elements, and acts on the drive circuit Signal output means for outputting an ON signal when the voltage exceeds the first predetermined voltage, and a plurality of switching elements of the drive circuit are gated when the voltage applied to the drive circuit is in a predetermined overvoltage state And a control means for controlling the drive circuit.
(A) determining whether a voltage applied to the drive circuit is in the predetermined overvoltage state based on a signal output from the signal output means and a voltage applied to the drive circuit;
(B) determining whether an abnormality has occurred in the signal output means based on at least the determination result and the signal output from the signal output means;
  Including
  In the step (b), when it is determined in step (a) that the voltage acting on the drive circuit is not in the predetermined overvoltage state, the output signal is an on signal, although the output signal is an on signal. It is a step of determining that an abnormality has occurred in the signal output means when a voltage acting on the drive circuit is equal to or lower than a second predetermined voltage.
  How to control the power system.