JP2009227078A - Power system, its control method, and vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To discriminate the abnormality of a first voltage sensor which detects the battery side voltage of a boost converter from the abnormality of the overvoltage of a battery, and to achieve much more appropriate control in a power system for supplying a voltage from a battery to an invertor by booting it by a boost converter, and for supplying the voltage from the battery to an auxiliary unit by decreasing it by a DC/DC converter. <P>SOLUTION: Even when a battery side voltage VL1 from a first voltage sensor becomes equal to or more than a voltage Vref for decision, and the generation of any temporary abnormality is decided (step S100, S110, S130), a battery side voltage VL2 from a second voltage sensor which detects a battery side voltage VL2 of a DC/DC converter is compared with a voltage Vref for decision. Thus, it is possible to discriminate overvoltage abnormality and the abnormality of a first voltage sensor (step S150 to S200), and to control the invertor or a boost converter based on the discrimination result (steps S140, S180, S210). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power system, a control method thereof, and a vehicle.

Conventionally, this type of power system includes a motor generator, an inverter that drives the motor generator, a boost converter that boosts the voltage from the battery and supplies it to the inverter, and a connection between the positive and negative buses of the inverter. And a smoothing capacitor, a discharge resistor connected in parallel with the capacitor between the positive and negative buses of the inverter, and a relay for cutting off power supply from the battery to the boost converter are proposed. (For example, refer to Patent Document 1). In this power system, when the detected value of the voltage sensor exceeds the allowable voltage, the operation of the inverter and boost converter is stopped for a predetermined period and the relay is turned off to disconnect the battery from the boost converter and the charge stored in the capacitor Is discharged with a discharge resistor, and an overvoltage abnormality in which the voltage actually exceeds the allowable voltage and an abnormality in the voltage sensor are discriminated based on the time change of the detection value of the voltage sensor.
JP 2007-252134 A

  As described above, in such a power system, when the detected value of the voltage sensor exceeds the allowable voltage, it is one of important issues to discriminate between an overvoltage abnormality and a voltage sensor abnormality. In the power system described above, a discharge resistance is used to discriminate between an overvoltage abnormality and a voltage sensor abnormality. However, if such a discharge resistance is provided in the power system, the number of parts increases. Therefore, it is desirable to discriminate between an overvoltage abnormality and a voltage sensor abnormality by a more appropriate method. In the power system described above, if the detected value of the voltage sensor exceeds the allowable voltage, the relay is turned off and the battery is disconnected from the boost converter, so that power cannot be supplied to the motor generator. Even if the voltage exceeds the voltage, if it is due to an abnormality of the voltage sensor, it may be possible to supply power to the motor generator. In such a case, it may be desirable to supply power to the motor generator. Therefore, it is desirable to perform more appropriate control in consideration of such matters.

  A power system, a control method thereof, and a vehicle according to the present invention are mainly intended to discriminate between an overvoltage abnormality and a voltage detector abnormality by a more appropriate method and to perform more appropriate control.

  The power system, the control method thereof, and the vehicle according to the present invention employ the following means in order to achieve the main object described above.

The power system of the present invention is
Driving equipment,
A drive circuit for driving the drive device;
A chargeable / dischargeable DC power supply,
Boosting supply means capable of boosting the voltage of the DC power supply and supplying the boosted voltage to the drive circuit;
Voltage conversion supply means capable of converting the voltage of the DC power source and supplying the converted voltage to the auxiliary machine;
First voltage detection means for detecting a first voltage which is a voltage on the DC power supply side of the boost supply means;
Second voltage detecting means for detecting a second voltage that is a voltage on the DC power supply side of the voltage conversion supply means;
Temporary abnormality determination means for determining a temporary abnormality when the first voltage detected by the first voltage detection means exceeds a normal control voltage range as a voltage range for normally controlling the DC power supply;
When it is determined that the temporary abnormality is detected by the temporary abnormality determination unit, an overvoltage abnormality is determined when the second voltage detected by the second voltage detection unit exceeds the normal control voltage range, and the second voltage is determined. A main abnormality determination unit that determines that the first voltage detection unit is abnormal when the second voltage detected by the detection unit is within the normal control voltage range for a predetermined time;
Controlling the driving circuit and the boosting supply means so that the operation of the boosting supply means is stopped and the power supply to the driving device is interrupted when the temporary abnormality determining means determines that the temporary abnormality has occurred; When it is determined that an overvoltage abnormality is detected by the main abnormality determination unit in a state where the temporary abnormality is determined, the voltage conversion supply is performed in a state where the operation of the boosting supply unit is stopped and the supply of power to the driving device is continuously stopped. The drive circuit, the boost supply means, and the voltage conversion supply means are controlled so that the operation of the means is stopped, and the abnormality of the first voltage detection means is detected by the abnormality determination means in a state where the temporary abnormality is determined. When it is determined, the drive circuit and the boost supply means are controlled so that the operation of the boost supply means is started and the supply of power to the drive device is started. And constantly control means,
It is a summary to provide.

  In the power system of the present invention, when the first voltage detected by the first voltage detecting means exceeds the normal control voltage range as the voltage range for normally controlling the DC power supply, it is determined that there is a temporary abnormality, When the abnormality is determined, if the second voltage detected by the second voltage detecting means exceeds the normal control voltage range, it is determined that the overvoltage is abnormal, and the second voltage detected by the second voltage detecting means is When the voltage is within the normal control voltage range for a predetermined time, it is determined that the first voltage detecting means is abnormal. Thereby, when the first voltage detected by the first voltage detection means exceeds the normal control voltage range, it is possible to discriminate between an overvoltage abnormality and an abnormality of the first voltage detection means by a more appropriate method. . When it is determined that there is a temporary abnormality, the operation of the boosting supply unit is stopped, and the drive circuit and the boosting supply unit are controlled so that the supply of power to the driving device is interrupted. When it is determined that there is an overvoltage abnormality, the drive circuit, the boost supply means, and the voltage conversion supply so that the operation of the voltage conversion supply means is stopped in a state where the operation of the boost supply means is stopped and the supply of power to the drive device is continued. The drive circuit is configured to start the operation of the boost supply unit and start the supply of electric power to the drive device when it is determined that the first voltage detection unit is abnormal in a state where it is determined as a temporary abnormality. And the boosting supply means. As a result, when the first voltage detected by the first voltage detecting means exceeds the normal control voltage range, it is more appropriate than the one that uniformly cuts off the power supply from the DC power supply to the drive circuit. Control can be performed.

  In such a power system of the present invention, the abnormal time control means may be means for shutting off the supply of electric power to the drive device by shutting off the gate of the drive circuit. By so doing, it is possible to more appropriately cut off the supply of power to the drive device by shutting off the gate.

  The vehicle of the present invention includes any one of the above-described power systems of the present invention, that is, basically a drive device, a drive circuit for driving the drive device, a chargeable / dischargeable DC power source, Boosting supply means capable of boosting the voltage of the DC power supply and supplying it to the drive circuit, voltage conversion supply means capable of converting the voltage of the DC power supply and supplying it to an auxiliary machine, and the DC power supply of the boosting supply means First voltage detection means for detecting a first voltage that is a voltage on the side of the power supply; second voltage detection means for detecting a second voltage that is a voltage on the DC power supply side of the voltage conversion supply means; and the first voltage detection means Temporary abnormality determination means for determining a temporary abnormality when the first voltage detected by the means exceeds a normal control voltage range as a voltage range for normally controlling the DC power supply, and the temporary abnormality determination means When determined to be abnormal, When the second voltage detected by the two voltage detecting means exceeds the normal control voltage range, it is determined that the overvoltage is abnormal, and the second voltage detected by the second voltage detecting means is the normal voltage over a predetermined time. When it is within the control voltage range, the abnormality determining means for determining that the first voltage detecting means is abnormal, and when the temporary abnormality determining means determines that there is a temporary abnormality, the operation of the boosting supply means is stopped and the operation is stopped. The drive circuit and the boosting supply means are controlled so that power supply to the driving device is cut off, and the boosting supply is performed when the abnormal determination means determines an overvoltage abnormality in a state where the temporary abnormality is determined. The drive circuit and the booster supply unit are stopped so that the operation of the voltage conversion supply means is stopped in a state in which the operation of the means is stopped and the supply of electric power to the drive device is continued And the voltage conversion supply means, and when the primary abnormality determination means determines that the first voltage detection means is abnormal in a state where the temporary abnormality is determined, the operation of the boost supply means is started. A power system including an abnormality time control means for controlling the drive circuit and the boosting supply means so that the supply of electric power to the drive equipment is started is mounted, and driving power can be output as the drive equipment The main point is to provide a simple electric motor.

  In the power system of the present invention, since the power system of the present invention according to any one of the aspects described above is mounted, the effects exhibited by the power system of the present invention, for example, the first voltage detected by the first voltage detecting means. When the voltage exceeds the normal control voltage range, it is possible to discriminate between an overvoltage abnormality and an abnormality in the first voltage detection means by a more appropriate method, and at the same time, an effect similar to the effect that more appropriate control can be performed. Can play.

The power system control method of the present invention includes:
Drive device, drive circuit for driving the drive device, chargeable / dischargeable DC power supply, boost supply means capable of boosting the voltage of the DC power supply and supplying it to the drive circuit, and voltage of the DC power supply Voltage conversion supply means capable of converting the voltage to supply to the auxiliary machine, first voltage detection means for detecting a first voltage which is a voltage on the DC power supply side of the boost supply means, and the DC of the voltage conversion supply means A power system control method comprising: a second voltage detecting means for detecting a second voltage that is a voltage on a power supply side,
When the first voltage detected by the first voltage detection means exceeds a normal control voltage range as a voltage range for normally controlling the DC power supply, a temporary abnormality is determined and the operation of the boost supply means is Controlling the drive circuit and the boost supply means so that the supply of power to the drive device is interrupted and stopped,
When the temporary abnormality is determined, if the second voltage detected by the second voltage detection means exceeds the normal control voltage range, it is determined that the overvoltage abnormality is present, and the operation of the boost supply means is stopped and Controlling the drive circuit, the boosting supply means, and the voltage conversion supply means so that the operation of the voltage conversion supply means is stopped in a state in which the supply of power to the drive device is continuously interrupted, and the second voltage When the second voltage detected by the detection means is within the normal control voltage range for a predetermined time, it is determined that the first voltage detection means is abnormal, the operation of the boosting supply means is started, and the driving is performed. Controlling the drive circuit and the boost supply means so that the supply of power to the device is started;
This is the gist.

  In this power system control method according to the present invention, a temporary abnormality is determined when the first voltage detected by the first voltage detection means exceeds the normal control voltage range as a voltage range for normally controlling the DC power supply. If the second voltage detected by the second voltage detecting means exceeds the normal control voltage range when the temporary abnormality is determined, it is determined that the overvoltage is abnormal, and the second voltage detected by the second voltage detecting means is detected. When the two voltages are within the normal control voltage range for a predetermined time, it is determined that the first voltage detecting means is abnormal. Thereby, when the first voltage detected by the first voltage detection means exceeds the normal control voltage range, it is possible to discriminate between an overvoltage abnormality and an abnormality of the first voltage detection means by a more appropriate method. When it is determined that there is a temporary abnormality, the operation of the boosting supply unit is stopped and the drive circuit and the boosting supply unit are controlled so that the power supply to the driving device is cut off. When it is determined that there is an overvoltage abnormality, the drive circuit, the boost supply means, and the voltage conversion supply so that the operation of the voltage conversion supply means is stopped in a state where the operation of the boost supply means is stopped and the supply of power to the drive device is continued. A drive circuit for starting the operation of the boosting supply means and starting the supply of electric power to the drive device when it is determined that the first voltage detection means is abnormal when it is determined that there is a temporary abnormality. And the boosting supply means. As a result, when the first voltage detected by the first voltage detection means exceeds the normal control voltage range, it is more appropriate than that which uniformly cuts off the supply of power from the DC power supply to the drive circuit. Control can be performed.

  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 a configuration of a hybrid vehicle 20 equipped with a power system as an embodiment of the present invention. In the hybrid vehicle 20 of the embodiment, as shown in the figure, a drive is coupled to an engine 22 and a crankshaft 24 as an output shaft of the engine 22 and coupled to drive wheels 28a and 28b via a differential gear 30. A planetary gear mechanism 26 having a ring gear connected to the shaft 32, a motor MG1 connected to the sun gear of the planetary gear mechanism 26, a motor MG2 connected to the drive shaft 32, and inverters 42 and 44 for driving the motors MG1 and MG2. A high voltage battery 46, a boost converter 50 that boosts the voltage of the high voltage battery 46 and supplies the boosted voltage to the inverters 42, 44, a smoothing capacitor 51 that smoothes the voltage boosted by the boost converter 50, the boost converter 50, and the high voltage battery 46 connected to the power line 48 connected to the A high-voltage DC power is converted to low voltage DC power comprises a DC / DC converter 56 supplies the auxiliary machine 52 and the low voltage battery 54 a low voltage system, and an electronic control unit 70 that controls the entire vehicle. Here, the power system of the embodiment mainly includes motors MG 1 and MG 2, inverters 42 and 44, a high voltage battery 46, a boost converter 50, a DC / DC converter 56, and an electronic control unit 70.

  The electronic control unit 70 is configured as a microcomputer centering on the CPU 72, and includes a ROM 74 for storing processing programs, a RAM 76 for temporarily storing data, an input / output port (not shown), and the like in addition to the CPU 72. The electronic control unit 70 detects signals necessary for controlling the engine 22 such as a crank position from a crank position sensor (not shown) that detects the rotational position of the crankshaft 24 of the engine 22 and the rotational positions of the rotors of the motors MG1 and MG2. Signals necessary for control of the motors MG1, MG2, such as rotational positions from a rotational position detection sensor (not shown), signals necessary for management of the high voltage battery 46, such as voltage sensors (not shown) attached in the vicinity of the output terminals of the high voltage battery 46, and boosting Necessary for control of boost converter 50 such as battery side voltage VL1 from voltage sensor 60 attached to high voltage battery 46 side of converter 50 and inverter side voltage from voltage sensor 62 attached to inverters 42 and 44 side of boost converter 50. Signal, DC / DC converter 56, a signal required for controlling the DC / DC converter 56 such as a battery side voltage VL2 from the voltage sensor 64 attached to the high voltage battery 46 side, an ignition signal from the ignition switch 80, and a shift for detecting the operation position of the shift lever 81. The shift position SP from the position sensor 82, the accelerator opening Acc from the accelerator pedal position sensor 84 that detects the depression amount of the accelerator pedal 83, and the brake pedal position BP from the brake pedal position sensor 86 that detects the depression amount of the brake pedal 85 The vehicle speed V from the vehicle speed sensor 88 is input via the input port. From the electronic control unit 70, a control signal to the engine 22, a switching control signal to the switching element of the inverters 42 and 44, a switching control signal to the switching element of the boost converter 50, and a switching to the switching element of the DC / DC converter 56 A control signal or the like is output via the output port. The electronic control unit 70 calculates the remaining capacity SOC based on the integrated value of the charge / discharge current detected by the current sensor to manage the high voltage battery 46, or based on the calculated remaining capacity SOC and the battery temperature Tb. Input / output limits Win and Wout, which are the maximum allowable power that may charge and discharge the high-voltage battery 46, are calculated.

  The hybrid vehicle 20 of the embodiment configured in this way calculates the required torque to be output to the drive shaft 32 based on the accelerator opening Acc and the vehicle speed V corresponding to the amount of depression of the accelerator pedal 83 by the driver. The operation of the engine 22, the motor MG1, and the motor MG2 is controlled so that the required power corresponding to the torque is output to the drive shaft 32. As operation control of the engine 22, the motor MG1, and the motor MG2, the operation of the engine 22 is controlled so that the power corresponding to the required power is output from the engine 22, and all of the power output from the engine 22 is transmitted to the planetary gear mechanism 26. Torque conversion operation mode for driving and controlling the motor MG1 and the motor MG2 so that torque is converted by the motor MG1 and the motor MG2 and output to the drive shaft 32, and the required power and the power required for charging and discharging the high voltage battery 46. Operation of the engine 22 is controlled so that a suitable power is output from the engine 22, and all or a part of the power output from the engine 22 with charge / discharge of the high voltage battery 46 is transmitted to the planetary gear mechanism 26, the motor MG1, and the motor. The required power is output to the drive shaft 32 with torque conversion by MG2. Charge-discharge drive mode for driving and controlling the motors MG1 and MG2, there is a motor operation mode in which operation control to output a power commensurate to stop the operation of the engine 22 to the required power from the motor MG2 to the drive shaft 32.

  Next, the operation of the hybrid vehicle 20 of the embodiment thus configured, particularly, an overvoltage abnormality exceeding the normal control voltage range as a voltage range that can be normally applied to the high voltage battery 46 and an abnormality of the voltage sensor 60 are discriminated. The operation at that time will be described. FIG. 2 is a flowchart showing an example of an abnormality determination processing routine executed by the electronic control unit 70. The normal control voltage range is set according to the maximum voltage allowed for the high voltage battery 46 and the vehicle specifications.

  When the abnormality determination processing routine is executed, the CPU 72 of the electronic control unit 70 first inputs the battery side voltage VL1 from the voltage sensor 60 (step S100), and uses the input battery side voltage VL1 and the determination voltage Vref. Processing for comparison is executed (step S110). Here, the determination voltage Vref is set as a voltage slightly higher than the upper limit voltage of the normal control voltage range of the high voltage battery 46. When the input battery side voltage VL1 is less than the determination voltage Vref, it is determined as normal (step S120), and the abnormality determination processing routine is terminated. When the battery side voltage VL1 is equal to or higher than the determination voltage Vref, some abnormality is present. It is determined that it has occurred, it is determined that there is a temporary abnormality (step S130), the inverters 42 and 44 are shut off, and the operation of the boost converter 50 is stopped (step S140). By such a process, when a temporary abnormality is determined, it is possible to suppress an excessive voltage from being applied to the high voltage battery 46 and to stop the traveling of the vehicle.

  Subsequently, the battery side voltage VL2 is input from the voltage sensor 64 (step S150), and the input battery side voltage VL2 is compared with the determination voltage Vref (step S160). When the battery side voltage VL2 is equal to or higher than the determination voltage Vref (step S160), even if the battery side voltage VL2 is less than the determination voltage Vref, the battery side voltage VL2 before the predetermined time tref elapses after the provisional abnormality is determined. When VL2 becomes equal to or higher than the determination voltage Vref (steps S150, S160, S190), it is determined that the voltage actually applied to the battery 46 is an overvoltage abnormality exceeding the normal control voltage range (step S170). The operation of the DC / DC converter 56 is stopped while continuing the gate shutoff of the inverters 42 and 44 and the stop of the operation of the boost converter 50 (step S180), and the abnormality determination processing routine is ended. In the process of step S190, the predetermined time tref is determined so that the battery-side voltage VL2 from the voltage sensor 64 becomes the determination voltage Vref after the battery-side voltage VL1 from the voltage sensor 60 exceeds the determination voltage Vref when an overvoltage abnormality occurs. It is assumed that the upper limit of the time until the value exceeds is set, and is set to, for example, 300 ms, 400 ms, 500 ms, etc. in consideration of the delay of the signal from the voltage sensor 64 and the like. By such processing, when it is determined that there is a temporary abnormality, an overvoltage abnormality can be determined by comparing the battery-side voltage VL2 from the voltage sensor 64 and the determination voltage Vref, compared to those using a discharge resistor. An overvoltage abnormality can be determined by a more appropriate method. Further, since the operation of the DC / DC converter 56 is stopped while the gates of the inverters 42 and 44 are shut off and the operation of the boost converter 50 is stopped, it is possible to suppress the application of an excessive voltage to the low voltage battery 54. it can.

  When the battery side voltage VL2 is less than the determination voltage Vref for a predetermined time tref (steps S150, S160, S190), it is determined that the voltage sensor 60 is not abnormal but not an overvoltage abnormality (step S200), and the inverters 42, 44 are used. The switching control is restarted, and the operation of the boost converter 50 is started assuming that the battery side voltage VL1 of the boost converter 50 is the rated voltage V1 of the high voltage battery 46 (step S210), and the abnormality determination processing routine is ended. By such processing, even when a temporary abnormality is determined, the abnormality of the voltage sensor 60 can be determined by comparing the battery side voltage VL2 from the voltage sensor 64 with the determination voltage Vref, and the discharge resistance is used. The abnormality of the voltage sensor 60 can be determined by a more appropriate method. Further, even when it is determined that there is a temporary abnormality, if it is determined that the voltage sensor 60 is abnormal, the inverters 42 and 44 can be driven to drive the motors MG1 and MG2 to drive the vehicle. , 44 can be controlled more appropriately than those that uniformly cut off the supply of electric power to.

  According to the hybrid vehicle 20 of the embodiment described above, a temporary abnormality is determined when the battery-side voltage VL1 from the voltage sensor 60 is equal to or higher than the determination voltage Vref, and the voltage sensor 64 is determined when the temporary abnormality is determined. By comparing the battery-side voltage VL2 from the battery and the determination voltage Vref, the overvoltage abnormality and the abnormality of the voltage sensor 60 can be discriminated, so that the overvoltage abnormality and the abnormality of the voltage sensor 60 are discriminated using the discharge resistance. In comparison, it is possible to discriminate between an overvoltage abnormality and an abnormality of the voltage sensor 60 by a more appropriate method. When the battery-side voltage VL1 from the voltage sensor 60 is equal to or higher than the determination voltage Vref and is determined to be a temporary abnormality, when it is determined that the voltage sensor 60 is not abnormal but not an overvoltage abnormality, the inverters 42 and 44 are driven to drive the motor. Since MG1 and MG2 are driven, more appropriate control can be performed as compared with the case where power supply from the high voltage battery 46 to the inverters 42 and 44 is uniformly cut off.

  In the hybrid vehicle 20 of the embodiment, power supply from the high voltage battery 46 to the motors MG1 and MG2 is interrupted by shutting off the gates of the inverters 42 and 44, but between the motors MG1 and MG2 and the high voltage battery 46. A relay may be provided (for example, between boost converter 50 and high voltage battery 46), and power supply from high voltage battery 46 to motors MG1 and MG2 may be shut off by turning this relay off.

  Further, the present invention is not limited to those applied to a hybrid vehicle including an engine and a motor, and may be applied to an electric vehicle including only a motor as a driving power source. Alternatively, the power system may be used. Moreover, it is good also as a form of the control method of such a power system.

  Here, the correspondence between the main elements of the embodiments and the modified examples and the main elements of the invention described in the column of means for solving the problems will be described. In the power system, in the embodiment, the motor MG2 corresponds to the “drive device”, the inverter 44 corresponds to the “drive circuit”, the high voltage battery 46 corresponds to the “DC power supply”, and the boost converter 50 includes the “boost supply means”. The DC / DC converter 56 corresponds to “voltage conversion supply means”, the voltage sensor 60 corresponds to “first voltage detection means”, and the voltage sensor 64 corresponds to “second voltage detection means”. The electronic control unit 70 that executes the processing of steps S100, S110, and S130 of the abnormality determination processing routine of FIG. 2 that determines a temporary abnormality when the battery-side voltage VL1 detected by the voltage sensor 60 is equal to or higher than the determination voltage Vref. Corresponds to “temporary abnormality determination means”, and the battery-side voltage VL2 detected by the voltage sensor 64 when it is determined as a temporary abnormality is the determination voltage Vre. The battery-side voltage VL2 detected by the voltage sensor 64 when it is determined as a temporary abnormality or the processing of steps S150 to S170 of the abnormality determination processing routine of FIG. The electronic control unit 70 that executes the processing of steps S150, S160, S190, and S200, which determines that the voltage sensor 60 is abnormal when it is less than the determination voltage Vref, corresponds to “main abnormality determination means” and is determined to be a temporary abnormality. Battery-side voltage VL2 detected by voltage sensor 64 when it is determined that the process of step S140 that stops gates of inverters 42 and 44 and stops the operation of boosting converter 50 or a temporary abnormality is greater than determination voltage Vref. Is shut off, and the operation of the boost converter 50 is stopped. The battery-side voltage VL2 detected by the voltage sensor 64 when it is determined as a temporary abnormality or the process in step S180 of the abnormality determination processing routine of FIG. The electronic control unit 70 that executes the process of step S210 that returns the gates of the inverters 42 and 44 and starts the operation of the boost converter 50 when the voltage is lower than the determination voltage Vref corresponds to “anomaly control means”. The motor MG1 also corresponds to “driving device”. The anti-rotor motor 230 also corresponds to a “drive device”. The inverter 42 also corresponds to a “drive circuit”. In the vehicle, the motor MG2 corresponds to an “electric motor”.

  Here, in the power system, the “drive device” is not limited to the motor MG1 or the motor MG2, and may be any device that is driven by receiving power supplied from a motor different from the motor MG1. The “drive circuit” is not limited to the inverter 42 and the inverter 44, and any drive circuit may be used as long as it is for driving a drive device. The “DC power supply” is not limited to the high voltage battery 46 and may be any battery that can be charged and discharged. The “boosting supply means” is not limited to the boosting converter 50, and any means can be used as long as it can boost the voltage of the DC power supply and supply it to the drive circuit. The “voltage conversion supply means” is not limited to the DC / DC converter 56, and any means can be used as long as it can convert the voltage of the DC power supply and supply it to the auxiliary machine. The “first voltage detecting means” is not limited to the voltage sensor 60, and any means may be used as long as it detects the first voltage that is the voltage on the DC power supply side of the boosting supply means. The “second voltage detecting means” is not limited to the voltage sensor 64, and any means can be used as long as it detects the second voltage that is the voltage on the DC power supply side of the voltage conversion supply means. The “temporary abnormality determination unit” is not limited to the one that determines a temporary abnormality when the battery-side voltage VL1 detected by the voltage sensor 60 is equal to or higher than the determination voltage Vref. As long as the detected first voltage exceeds the normal control voltage range as the voltage range for normally controlling the DC power supply, any temporary abnormality may be used. As the “normal abnormality determination means”, an overvoltage abnormality is determined when the battery side voltage VL2 detected by the voltage sensor 64 when the temporary abnormality is determined is equal to or higher than the determination voltage Vref, and the temporary abnormality is determined. When the battery-side voltage VL2 detected by the voltage sensor 64 is less than the determination voltage Vref for a predetermined time, the present invention is not limited to the case where the abnormality of the voltage sensor 60 is determined. If the second voltage detected by the voltage detection means exceeds the normal control voltage range when it is determined as a temporary abnormality, it is determined as an overvoltage abnormality, and the second voltage detected by the voltage detection means is predetermined. Anything may be used as long as it is determined that the first voltage detection means is abnormal when it is within the normal control voltage range over time. As the “abnormal control means”, the gates of the inverters 42 and 44 are shut off when the temporary abnormality is determined and the operation of the boost converter 50 is stopped, and the voltage sensor 64 is detected when the temporary abnormality is determined. When the battery-side voltage VL2 is equal to or higher than the determination voltage Vref, the operation of the DC / DC converter 56 is stopped while the gates of the inverters 42 and 44 are stopped and the operation of the boost converter 50 is stopped. When the battery side voltage VL2 detected by the voltage sensor 64 is lower than the determination voltage Vref for a predetermined time, the inverters 42 and 44 are returned to the gate and the operation of the boost converter 50 is started. When the provisional abnormality determination means determines that the provisional abnormality is present, the operation of the supply means is stopped and The drive circuit and the boosting supply means are controlled so that the power supply to the moving equipment is cut off, and the operation of the boosting supply means is stopped when the abnormality determining means determines that an overvoltage abnormality is detected in a state where it is determined as a temporary abnormality. In addition, the drive circuit, the boost supply means, and the voltage conversion supply means are controlled so that the operation of the voltage conversion supply means is stopped in a state in which the supply of power to the drive device is continuously interrupted. When the abnormality determining means determines that the first voltage detecting means is abnormal, the operation of the boosting supply means is started and the drive circuit and the boosting supply means are controlled so that the supply of power to the driving device is started. Anything can be used. Further, in the vehicle, the “electric motor” is not limited to the motor MG2, and any motor can be used as long as it can output driving power.

  Note that the correspondence between the main elements of the embodiment and the modified example and the main elements of the invention described in the column of means for solving the problem is described in the column of means for the embodiment to solve the problem. Since this is an example for specifically describing the best mode for carrying out the invention, 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.

  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.

  The present invention is applicable to a power system, a vehicle manufacturing industry, and the like.

1 is a configuration diagram showing an outline of the configuration of a hybrid vehicle 20 equipped with a power system as one embodiment of the present invention. 4 is a flowchart showing an example of an abnormality determination processing routine executed by an electronic control unit 70.

Explanation of symbols

  20 hybrid vehicle, 22 engine, 24 crankshaft, 26 planetary gear mechanism, 28a, 28b drive wheel, 30 differential gear, 32 drive shaft, 42, 44 inverter, 46 high voltage battery, 48 power line, 50 boost converter, 51 smoothing capacitor , 52 Auxiliary machine, 54 Low voltage battery, 56 DC / DC converter, 60, 62, 64 Voltage sensor, 70 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, MG1, MG2 motor.

Claims (4)

Driving equipment,
A drive circuit for driving the drive device;
A chargeable / dischargeable DC power supply,
Boosting supply means capable of boosting the voltage of the DC power supply and supplying the boosted voltage to the drive circuit;
Voltage conversion supply means capable of converting the voltage of the DC power source and supplying the converted voltage to the auxiliary machine;
First voltage detection means for detecting a first voltage that is a voltage on the DC power supply side of the boost supply means;
Second voltage detection means for detecting a second voltage that is a voltage on the DC power supply side of the voltage conversion supply means;
Temporary abnormality determination means for determining a temporary abnormality when the first voltage detected by the first voltage detection means exceeds a normal control voltage range as a voltage range for normally controlling the DC power supply;
When it is determined that the temporary abnormality is detected by the temporary abnormality determination unit, an overvoltage abnormality is determined when the second voltage detected by the second voltage detection unit exceeds the normal control voltage range, and the second voltage is determined. A main abnormality determination unit that determines that the first voltage detection unit is abnormal when the second voltage detected by the detection unit is within the normal control voltage range for a predetermined time;
Controlling the driving circuit and the boosting supply means so that the operation of the boosting supply means is stopped and the power supply to the driving device is interrupted when the temporary abnormality determining means determines that the temporary abnormality has occurred; When it is determined that an overvoltage abnormality is detected by the main abnormality determination unit in a state where the temporary abnormality is determined, the voltage conversion supply is performed in a state where the operation of the boosting supply unit is stopped and the supply of power to the driving device is continuously stopped. The drive circuit, the boost supply means, and the voltage conversion supply means are controlled so that the operation of the means is stopped, and the abnormality of the first voltage detection means is detected by the abnormality determination means in a state where the temporary abnormality is determined. When it is determined, the drive circuit and the boost supply means are controlled so that the operation of the boost supply means is started and the supply of power to the drive device is started. And constantly control means,
Power system with   2. The power system according to claim 1, wherein the abnormality control unit is a unit that interrupts the supply of electric power to the drive device by blocking the gate of the drive circuit. 3.   A vehicle equipped with an electric motor on which the power system according to claim 1 or 2 is mounted and capable of outputting driving power as the driving device. Drive device, drive circuit for driving the drive device, chargeable / dischargeable DC power supply, boost supply means capable of boosting the voltage of the DC power supply and supplying it to the drive circuit, and voltage of the DC power supply Voltage conversion supply means capable of converting the voltage to supply to the auxiliary machine, first voltage detection means for detecting a first voltage which is a voltage on the DC power supply side of the boost supply means, and the DC of the voltage conversion supply means A power system control method comprising: a second voltage detecting means for detecting a second voltage that is a voltage on a power supply side,
When the first voltage detected by the first voltage detection means exceeds a normal control voltage range as a voltage range for normally controlling the DC power supply, a temporary abnormality is determined and the operation of the boost supply means is Controlling the drive circuit and the boost supply means so that the supply of power to the drive device is interrupted and stopped,
When the temporary abnormality is determined, if the second voltage detected by the second voltage detection means exceeds the normal control voltage range, it is determined that the overvoltage abnormality is present, and the operation of the boost supply means is stopped and Controlling the drive circuit, the boosting supply means, and the voltage conversion supply means so that the operation of the voltage conversion supply means is stopped in a state in which the supply of power to the drive device is continuously interrupted, and the second voltage When the second voltage detected by the detection means is within the normal control voltage range for a predetermined time, it is determined that the first voltage detection means is abnormal, the operation of the boosting supply means is started, and the driving is performed. Controlling the drive circuit and the boost supply means so that the supply of power to the device is started;
Power system control method.

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