JP2011155743A - Electric vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further properly start a system after a secondary battery is disconnected by system main relays due to an impact such as a collision. <P>SOLUTION: When starting the system after the battery is disconnected from a drive power system due to the collision or the like, only one of the system main relays is turned on, all of an inverter and a DC-DC converter of the drive power system are gate-disconnected, and a decrease in the insulation resistance is detected (S200 to S220). When no decrease in the insulation resistance is detected, the system main relay is turned on, a decrease in the insulation resistance is detected by sequentially gate-permitting the inverter and the DC-DC converter, and only a circuit in which a decrease in the insulation resistance is detected is gate-disconnected (S250 to S290), thus starting the system by prohibiting the drive of a gate-disconnected apparatus. Owing to this, the system can be started by bringing an apparatus in which no decrease in the insulation resistance is detected into a state that the apparatus can be driven. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electric vehicle, and more specifically, a traveling motor, a motor driving circuit that drives the motor, at least one auxiliary machine, an auxiliary driving circuit that drives the auxiliary machine, and an electric motor driving circuit. And a secondary battery that supplies power to the drive system to which the auxiliary circuit is connected, and a positive-side connection release unit that connects and disconnects the positive side of the secondary battery and the positive side of the drive system Connection release means having a negative electrode side connection release part for connecting and releasing the negative electrode side of the secondary battery and the drive system negative electrode side, acceleration detection means for detecting vehicle acceleration, and detection by the acceleration detection means Collision time control for controlling the connection release means so that the connection by the positive electrode side connection release unit and the connection by the negative electrode side connection release unit are both released when the measured acceleration is within a predetermined acceleration range determined as a result of a vehicle collision. And means, to an electric vehicle equipped with.

  Conventionally, as this type of electric vehicle, a traveling motor, an inverter that drives the motor, a high-voltage battery that supplies power to the inverter, a system main relay that cuts off power from the high-voltage battery, an inverter, An electronic control unit that controls the system main relay, a weak battery that supplies power for driving the electronic control unit, a fuse for the electronic control unit interposed between the electronic control unit and the weak battery, and a fuse for the electronic control unit And an actuator fuse for supplying electric power from a weak battery to an actuator in the vicinity of the front wheel of the vehicle in common (see, for example, Patent Document 1). In this electric vehicle, when the vehicle collides, the actuator power harness is peeled off due to deformation caused by the collision and the actuator power harness is short-circuited, so that the actuator fuse is blown. At this time, since a large current flows through the actuator fuse, the voltage of the bus drops, the current flowing through the electronic control unit fuse decreases, and the control voltage of the electronic control unit decreases. When the control voltage of the electronic control unit reaches less than a predetermined voltage, the electronic control unit turns off the system main relay to cut off the high voltage battery and the inverter. As described above, the system main relay is turned off by the collision of the vehicle, but the fuse for the electronic control unit is not blown, so that it is possible to start the system thereafter.

JP 2009-38862 A

  However, in the above-described electric vehicle, an unexpected inconvenience may occur due to the power of the high voltage battery after the vehicle collision. In the above-described electric vehicle, the fuse for the electronic control unit is not broken even when the vehicle collides. Therefore, even when the inverter or the motor is damaged due to the vehicle collision, the system can be activated and the system main relay can be turned on. At this time, power from the high voltage battery is applied to the damaged inverter or motor, and an unexpected situation occurs.

  The main object of the electric vehicle of the present invention is to start the system more properly after the secondary battery is shut off by the system main relay due to an impact such as a collision.

  The electric vehicle of the present invention employs the following means in order to achieve the main object described above.

The electric vehicle of the present invention is
An electric motor for traveling, an electric motor drive circuit for driving the electric motor, at least one auxiliary machine, an auxiliary machine drive circuit for driving the auxiliary machine, the electric motor drive circuit, and the auxiliary machine drive circuit, A secondary battery for supplying power to a connected drive system; a positive-side connection release unit for connecting and releasing the positive-electrode side of the secondary battery and the positive-electrode side of the drive system; and the secondary battery A connection release means having a connection between the negative electrode side of the drive system and the negative electrode side of the drive system and a negative electrode side connection release portion for releasing the connection, an acceleration detection means for detecting the acceleration of the vehicle, and the detected acceleration Control unit for collision when controlling the connection release unit so that the connection by the positive electrode side connection release unit and the connection by the negative electrode side connection release unit are both released when it is within a predetermined acceleration range determined as a result of a vehicle collision , An electric car with a,
Insulation resistance decrease detection means connected to one of the positive electrode side connection release part and the negative electrode side connection release part on the secondary battery side of the connection release means to detect a decrease in insulation resistance of the circuit;
When the system control is requested in a state where the connection by the positive-side connection release unit and the connection by the negative-side connection release unit are both released by the control unit at the time of collision, the positive-side connection release unit and the negative-side connection release By the insulation resistance lowering detection means in a state where all gates are disconnected, in which only one of the connection release parts is connected and the motor drive circuit and the accessory drive circuit are all gated. The connection release means, the motor drive circuit, the auxiliary drive circuit, and the insulation resistance drop detection means are controlled so that a drop in insulation resistance is detected, and the insulation resistance drop detection means in the all-gate cutoff state. When a decrease in insulation resistance is not detected by the above, the connection release parts of both the positive electrode side connection release part and the negative electrode side connection release part are connected in front. The drive circuit for the electric motor and the drive circuit for the auxiliary machine are sequentially allowed to be gated, and the drive circuit in which the decrease in insulation resistance is detected by the insulation resistance decrease detection means and the decrease in the insulation resistance is detected is shut off, and sequentially The connection is released to permit system start-up in a state where the drive of the gate-blocked drive circuit is prohibited when any of the drive circuits is permitted after the detection of the decrease in insulation resistance with the gate permitted. Control means, the motor drive circuit, the auxiliary drive circuit, and the insulation resistance drop detection means, and when the insulation resistance drop detection means detects a drop in insulation resistance in the all-gate cutoff state or the When all gates are shut off after the detection of the decrease in insulation resistance with the sequential gates enabled, the system start-up is prohibited when the gates are shut off. And Temu start-up control means,
It is a summary to provide.

  In the electric vehicle according to the present invention, the positive-side connection release unit and the negative-side connection release unit are connected because the vehicle acceleration is within a predetermined acceleration range determined by the vehicle collision due to a vehicle collision or the like. When the system activation is requested after both are released and the secondary battery is disconnected from the drive system, first, only one of the positive side connection release unit and the negative side connection release unit is connected. In addition, a decrease in insulation resistance is detected by an insulation resistance decrease detection means in a state where all of the electric motor drive circuit and the auxiliary machine drive circuit are shut off (all gates shut off). When a decrease in insulation resistance is not detected by the insulation resistance decrease detection means in this all gate cut-off state, the motor drive circuit and the auxiliary circuit are connected with the connection release units of both the positive side connection release unit and the negative side connection release unit connected. The gate for the machine drive circuit is sequentially allowed, and the decrease in insulation resistance is detected by the insulation resistance decrease detecting means, and the drive circuit in which the decrease in insulation resistance is detected is shut off. When one of the drive circuits is permitted after the detection of the decrease in insulation resistance by sequentially permitting the gate, the system activation is permitted in a state where the drive of the drive circuit that is gate-blocked is prohibited. In this way, after the gates of all the drive circuits are shut off, the gates are sequentially allowed to detect the decrease in insulation resistance, and the drive circuits in which the decrease in insulation resistance is detected are gated and the system is activated with the drive prohibited. Therefore, it is possible to start the system as a state in which only the drive circuit in which a decrease in insulation resistance is not detected can be driven. As a result, it is possible to avoid the inconvenience caused by applying the voltage of the secondary battery to the drive circuit in which the decrease in insulation resistance is detected. Therefore, the system can be started more properly. On the other hand, even if the insulation resistance drop is detected by the insulation resistance drop detection means when all gates are cut off, or when the insulation resistance drop is not detected by the insulation resistance drop detection means when all gates are cut off, the gates are allowed sequentially. When all the drive circuits are shut off after the detection of the decrease in insulation resistance is completed, system activation is prohibited. Thereby, it is possible to prevent the system from being inadvertently activated.

1 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 20 that can also function as an electric vehicle as one embodiment of the present invention. It is explanatory drawing which shows the insulation resistance fall detector 64 and the simple model 90 of the system | strain to which this insulation resistance fall detector 64 was connected. 5 is a flowchart showing an example of a collision process executed by the hybrid electronic control unit 70; 7 is a flowchart showing an example of a post-collision system activation process executed by the hybrid electronic control unit 70.

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

  FIG. 1 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 20 that can also function as an electric vehicle as an embodiment of the present invention. As shown in the figure, the hybrid vehicle 20 of the embodiment includes an engine 22 that outputs power using gasoline or light oil as a fuel, an engine electronic control unit (hereinafter referred to as an engine ECU) 24 that drives and controls the engine 22, and A planetary gear 30 having a carrier connected to the crankshaft 26 of the engine 22 and a ring gear connected to a drive shaft 36 connected to drive wheels 38a and 38b via a differential gear 37, and rotating as a synchronous generator motor, for example. A motor MG1 whose child is connected to the sun gear of the planetary gear 30, a motor MG2 configured as, for example, a synchronous generator motor and having a rotor connected to the drive shaft 36, and inverters 41 and 42 for driving the motors MG1 and MG2. , Switches (not shown) of the inverters 41 and 42 A battery 50 that exchanges power with a motor power control unit (hereinafter referred to as a motor ECU) 40 that controls driving of the motors MG1 and MG2 by switching control of the driving elements, and a driving power system to which the inverters 41 and 42 are connected. In addition, power is supplied to an air conditioner inverter 61 connected to a drive power system for driving an air conditioner (hereinafter referred to as an air conditioner) 60 for air conditioning the passenger compartment, and an auxiliary battery 62 that drives the auxiliary machine. In order to achieve this, the DC / DC converter 63 connected to the drive power system, and the battery 50 and the positive power line and the negative power line connected to the drive power system are individually connected or disconnected (cut off). A system main relay 52 comprising a positive side relay 52 a and a negative side relay 52 b, and a drive power from the system main relay 52 A smoothing capacitor 54 and a voltage sensor 53 attached to the system, an insulation resistance drop detector 64 connected to the negative power line connected to the negative terminal of the battery 50 on the battery 50 side from the system main relay 52, and a shift Brake from the brake pedal position sensor 86 for detecting the shift position from the shift position sensor 82 for detecting the position of the lever, the accelerator opening from the accelerator pedal position sensor 84 for detecting the depression amount of the accelerator pedal, and the depression amount of the brake pedal. A hybrid electronic control unit 70 that inputs the position, the vehicle speed from the vehicle speed sensor 88, the acceleration G from the acceleration sensor 89, and the like and communicates with the engine ECU 24 and the motor ECU 40 to control the entire vehicle is provided.

  FIG. 2 is an explanatory diagram showing an insulation resistance lowering detector 64 of the embodiment and a simplified model 90 of a system to which the insulation resistance lowering detector 64 is connected. As shown in the figure, the insulation resistance drop detector 64 includes an oscillation power supply 65 grounded at one end, a detection resistor 66 connected at one terminal to the oscillation power supply 65, and one terminal being the other terminal of the detection resistor 66. And a coupling capacitor 67 whose other terminal is connected to the simplified model 90, and a voltage sensor 68 that detects the voltage at the connection between the detection resistor 66 and the coupling capacitor 67. Here, the simplified model 90 is a circuit model when one or both of the positive side relay 52 a and the negative side relay 52 b of the system main relay 52 are turned on, and one terminal is connected to the coupling capacitor 67. And an insulation resistor 92 whose other terminal is grounded, and a common mode capacitor 93 connected in parallel to the insulation resistor 92. The voltage waveform detected from the voltage sensor 68 has almost the same amplitude as that of the oscillation power supply 65 because almost no current flows through the detection resistor 66 when the impedance of the simple model 90 is large. Since the current flows through the detection resistor 66 when the voltage is small, the voltage waveform has a small amplitude corresponding to the voltage drop at the detection resistor 66. Accordingly, the voltage sensor 68 of the insulation resistance drop detector 64 outputs a voltage waveform having substantially the same amplitude as that of the oscillation power supply 65 when the insulation resistance of the driving power system is not reduced, that is, the simplified model 90. When the insulation resistance is lowered, a voltage waveform having an amplitude smaller than that of the oscillation power supply 65 is output. In the insulation resistance lowering detector 64 of the embodiment, when the amplitude of the voltage waveform detected from the voltage sensor 68 is larger than the threshold for determination set in advance as a value slightly smaller than the amplitude of the voltage waveform of the oscillation power supply 65, the insulation resistance is reduced. It is determined that a decrease is not detected, and it is determined that a decrease in insulation resistance is detected when the amplitude of the voltage waveform detected from the voltage sensor 68 is smaller than the determination threshold.

  The hybrid vehicle 20 of the embodiment thus configured calculates a required torque to be output to the drive shaft 36 based on the accelerator opening Acc and the vehicle speed V corresponding to the amount of depression of the accelerator pedal by the driver, and this required torque. The engine 22, the motor MG 1, and the motor MG 2 are controlled for operation so that the required power corresponding to is output to the drive shaft 36. As the 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 transmitted to the planetary gear 30 and the motor MG1. The motor MG2 converts the torque of the motor MG1 and the motor MG2 so that the motor MG1 and the motor MG2 are driven and controlled, and the power suitable for the sum of the required power and the power required for charging and discharging the battery 50 is obtained. The operation of the engine 22 is controlled so as to be output from the engine 22, and all or a part of the power output from the engine 22 with charging / discharging of the battery 50 is converted by the planetary gear 30, the motor MG1, and the motor MG2. Accordingly, the required power is output to the drive shaft 36. Charge-discharge drive mode for driving and controlling the motor MG1 and the motor 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 36.

  Next, an operation when the hybrid vehicle 20 of the embodiment collides and an operation when the system is started after the collision will be described. FIG. 3 is a flowchart illustrating an example of collision processing executed by the hybrid electronic control unit 70 according to the embodiment. This collision process is repeatedly executed every predetermined time (for example, every several msec). When the collision process is executed, the hybrid electronic control unit 70 first inputs the acceleration G from the acceleration sensor 89 (step S100), and the range of the absolute value of the acceleration when the absolute value of the acceleration G collides. It is determined whether or not the lower limit value is greater than or equal to a preset threshold value Gref (step S110). When the absolute value of the acceleration G is less than the threshold value Gref, it is determined that no collision has occurred, and this routine is terminated. When the absolute value of the acceleration G is greater than or equal to the threshold value Gref, it is determined that a collision has occurred, and the system main relay 52 Both the positive-side relay 52a and the negative-side relay 52b are turned off to disconnect the battery 50 from the drive power system (step S120), store the collision history (step S130), and end the present process. Thus, when the vehicle collides, the system is shut down by the system main relay 52 disconnecting the battery 50 from the drive power system.

  FIG. 4 shows an example of a post-collision system activation process executed by the hybrid electronic control unit 70 when a driver or the like requests a system activation for the first time after the collision history is stored by the collision process of FIG. It is a flowchart to show. When the system activation process after the collision is executed, the hybrid electronic control unit 70 first turns on only the negative side relay 52b of the system main relay 52 to which the insulation resistance lowering detector 64 is connected (step S200). Then, all of inverters 41, 42, 61 and DC / DC converter 63 are shut off (step S210), and a decrease in the insulation resistance of the drive power system is detected by insulation resistance drop detector 64 (step S220). When a decrease in the insulation resistance of the drive power system is detected, system activation is prohibited (step S320), the system main relay 52 is turned off (step S330), and this process ends. In this case, since it can be determined that the drive power system power line or the like has been damaged or peeled off and the insulation resistance of the drive power system has decreased, any device can be driven even when the system is started. It is not possible.

  When a decrease in the insulation resistance of the drive power system is not detected in step S230, not only the negative side relay 52b of the system main relay 52 but also the positive side relay 52a is turned on (step S240), and the inverters 41, 42, 61, DC / DC Any one of the converters 63 (for example, the inverter 41) is allowed to be gated (step S250), and a decrease in the insulation resistance of the drive power system by the insulation resistance drop detector 64 is detected (steps S260 and S270). When a decrease in the insulation resistance of the power system is not detected, the process returns to the process of step S250 until the detection of the insulation resistance of the drive power system with all gate permission of the inverters 41, 42, 61 and the DC / DC converter 63 is completed. When a decrease in insulation resistance of the power system is detected, the gate is permitted. Gates breaking the circuit (step S280), the inverter 41,42,61, until the detection of the insulation resistance of the drive power system according to any of the gate permits ends of the DC / DC converter 63 returns to step S250. Here, the gate permission does not flow current only by permitting the gate. In the embodiment, the processes of steps S250 to S290 are repeated four times in the order of, for example, inverters 41, 42, 61, and DC / DC converter 63. If a decrease in the insulation resistance of the drive power system is detected when the gate is permitted, the gate-permitted inverter, DC / DC converter, motor, air conditioner, or auxiliary device connected to the inverter may be damaged by a collision. The case where it is short-circuited is considered. Therefore, the above-described process is a process in which only the target for which such a decrease in insulation resistance is detected is gated off and separated from the drive power system.

  When the detection of the insulation resistance of the drive power system by all the gate permission of the inverters 41, 42, 61 and the DC / DC converter 63 is completed, one of the inverters 41, 42, 61 and the DC / DC converter 63 is gate permitted. It is determined whether or not all of the inverters 41, 42, 61, and the DC / DC converter 63 are gate-blocked (step S300). Therefore, the system activation is prohibited (step S320), the system main relay 52 is turned off (step S330), the process is terminated, and any of the inverters 41, 42, 61 and the DC / DC converter 63 is selected. When the gate is permitted, the system prohibits the driving of the device that is shut off. It allows the dynamic (step S310), and ends the present routine. When the system is activated, only gate-granted devices can be driven. For example, considering the inverters 41 and 42, when both of the inverters 41 and 42 are permitted to gate, motor driving by the motor MG2 and driving using the power from the engine 22 are possible, and the inverter 41 is gate-cut off. When the gate of the inverter 42 is permitted, the motor MG2 can run. When the gate of the inverter 42 is interrupted, but the inverter 41 is gated, the motor MG1 is driven to drive the motor motive power. It becomes possible to travel without driving the MG2. Further, when the inverter 61 is permitted to be gated, air conditioning of the passenger compartment can be performed. Further, when the gate of the DC / DC converter 63 is permitted, electric power can be supplied to the auxiliary battery 62, so that the auxiliary machine can be driven.

  According to the hybrid vehicle 20 of the embodiment described above, when a system activation request is made after the battery 50 is disconnected from the drive power system by the system main relay 52 by the process at the time of collision and the collision history is stored, the insulation resistance Only the negative side relay 52b of the system main relay 52 to which the drop detector 64 is connected is turned on, and the inverters 41, 42, 61 and the DC / DC converter 63 are all shut off to detect a drop in insulation resistance. When a decrease in the drive power is not detected, the inverters 41, 42, 61 and the DC / DC converter 63 are gated in order with the positive relay 52a of the system main relay 52 turned on to detect a decrease in the insulation resistance of the drive power system. As a result, only the target circuit in which the decrease in insulation resistance is detected is gate-cut off, and the inverter 4 , 42, 61, when any one of the DC / DC converters 63 is gate-gated, by prohibiting driving of the gate-gated device and allowing system activation, only a device in which a decrease in insulation resistance is not detected. It is possible to start the system as a state where it can be driven. As a result, it is possible to avoid the inconvenience caused by applying the voltage of the battery 50 to the circuit in which the decrease in insulation resistance is detected. Further, when only the negative side relay 52b of the system main relay 52 is turned on and all of the inverters 41, 42, 61 and the DC / DC converter 63 are shut off to detect a decrease in insulation resistance, a decrease in insulation resistance is detected. When the system main relay 52 is turned on, the inverters 41, 42, 61 and the DC / DC converter 63 are gated in order to detect a decrease in the insulation resistance of the drive power system, and then the inverters 41, 42, 61 , When all of the DC / DC converters 63 are gate-blocked, the system is prohibited from starting and the system main relay 52 is turned off, so that the system is inadvertently started when any device cannot be driven. Can be suppressed. As a result, the system can be started more appropriately.

  In the hybrid vehicle 20 of the embodiment, when the system activation process after the collision is executed, only the negative side relay 52b of the system main relay 52 to which the insulation resistance lowering detector 64 is connected is turned on and the inverters 41 and 42 are turned on. , 61, and the DC / DC converter 63 are all shut off to detect a decrease in the insulation resistance of the drive power system by the insulation resistance decrease detector 64. When no decrease in the insulation resistance is detected, the negative side of the system main relay 52 is detected. Although not only the relay 52b but also the positive side relay 52a is turned on, the gates of the inverters 41, 42, 61 and the DC / DC converter 63 are sequentially allowed to detect a decrease in insulation resistance. The system main relay 52 to which the insulation resistance drop detector 64 is not connected. Only the pole-side relay 52a is turned on, and all of the inverters 41, 42, 61 and the DC / DC converter 63 are shut off to detect a decrease in the insulation resistance of the drive power system by the insulation resistance drop detector 64, and the insulation resistance When the decrease in the insulation resistance is not detected, not only the positive side relay 52a but also the negative side relay 52b of the system main relay 52 is turned on, and the inverters 41, 42, 61 and the DC / DC converter 63 are sequentially allowed to be gated to detect the decrease in the insulation resistance. It is good also as what to do. This is because even if only the positive side relay 52a of the system main relay 52 is turned on, the insulation resistance drop detector 64 is connected to the driving power system via the positive side relay 52a and the battery 50. Based on the ability to detect a drop in resistance.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the motor MG1 and the motor MG2 correspond to the “motor”, the inverter 41 and the inverter 42 correspond to the “motor drive circuit”, and are connected to the air conditioner 60, the auxiliary battery 62, or the auxiliary battery 62. The auxiliary equipment that does not correspond to “auxiliary equipment”, the inverter 61 and the DC / DC converter 63 correspond to “auxiliary equipment drive circuit”, the battery 50 corresponds to “secondary battery”, the positive side relay 52a and the negative polarity The system main relay 52 having the side relay 52b corresponds to “connection release means” having a positive side connection release portion and a negative side connection release portion, and the acceleration sensor 89 corresponds to “acceleration detection means”. The hybrid electronic control unit 70 that executes time processing corresponds to the “collision control means”, and the insulation resistance decrease detector 64 corresponds to “insulation resistance decrease detection means”. The hybrid electronic control unit 70 to perform the post-collision system startup process corresponds to "post-collision system startup control means".

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

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

  The present invention can be used in the manufacturing industry of electric vehicles.

  20 hybrid vehicle, 22 engine, 24 engine electronic control unit (engine ECU), 26 crankshaft, 30 planetary gear, 36 drive shaft, 37 differential gear, 38a, 38b drive wheel, 40 motor electronic control unit (motor ECU), 41, 42, 61 Inverter, 50 Battery, 52 System main relay, 52a Positive side relay, 52b Negative side relay, 53 Voltage sensor, 54 Smoothing capacitor, 60 Air conditioner (Air conditioner), 62 Auxiliary battery, 63 DC / DC converter 64, insulation resistance drop detector, 65 oscillation power supply, 66 detection resistor, 67 coupling capacitor, 68 voltage sensor, 70 hybrid electronic control unit, 82 shift position sensor, 84 accelerator pedal position Deployment sensor, 86 brake pedal position sensor, 88 vehicle speed sensor, 89 acceleration sensor, 90 simple model, 92 insulation resistance, 93 common mode capacitor, MG1, MG2 motor.

Claims (1)

An electric motor for traveling, an electric motor drive circuit for driving the electric motor, at least one auxiliary machine, an auxiliary machine drive circuit for driving the auxiliary machine, the electric motor drive circuit, and the auxiliary machine drive circuit, A secondary battery for supplying power to a connected drive system; a positive-side connection release unit for connecting and releasing the positive-electrode side of the secondary battery and the positive-electrode side of the drive system; and the secondary battery A connection release means having a connection between the negative electrode side of the drive system and the negative electrode side of the drive system and a negative electrode side connection release portion for releasing the connection, an acceleration detection means for detecting the acceleration of the vehicle, and the detected acceleration Control unit for collision when controlling the connection release unit so that the connection by the positive electrode side connection release unit and the connection by the negative electrode side connection release unit are both released when it is within a predetermined acceleration range determined as a result of a vehicle collision , An electric car with a,
Insulation resistance decrease detection means connected to one of the positive electrode side connection release part and the negative electrode side connection release part on the secondary battery side of the connection release means to detect a decrease in insulation resistance of the circuit;
When the system control is requested in a state where the connection by the positive-side connection release unit and the connection by the negative-side connection release unit are both released by the control unit at the time of collision, the positive-side connection release unit and the negative-side connection release By the insulation resistance lowering detection means in a state where all gates are disconnected, in which only one of the connection release parts is connected and the motor drive circuit and the accessory drive circuit are all gated. The connection release means, the motor drive circuit, the auxiliary drive circuit, and the insulation resistance drop detection means are controlled so that a drop in insulation resistance is detected, and the insulation resistance drop detection means in the all-gate cutoff state. When a decrease in insulation resistance is not detected by the above, the connection release parts of both the positive electrode side connection release part and the negative electrode side connection release part are connected in front. The drive circuit for the electric motor and the drive circuit for the auxiliary machine are sequentially allowed to be gated, and the drive circuit in which the decrease in insulation resistance is detected by the insulation resistance decrease detection means and the decrease in the insulation resistance is detected is shut off, and sequentially The connection is released to permit system start-up in a state where the drive of the gate-blocked drive circuit is prohibited when any of the drive circuits is permitted after the detection of the decrease in insulation resistance with the gate permitted. Control means, the motor drive circuit, the auxiliary drive circuit, and the insulation resistance drop detection means, and when the insulation resistance drop detection means detects a drop in insulation resistance in the all-gate cutoff state or the When all gates are shut off after the detection of the decrease in insulation resistance with the sequential gates enabled, the system start-up is prohibited when the gates are shut off. And Temu start-up control means,
Electric car with

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