JP2012101748A - Control device of electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device of an electric vehicle which starts an engine without need of a spare battery etc., when a strong electric system is stopped due to abnormalities in a battery and enables travel continuation of the vehicle by operation of the power generation device.SOLUTION: The control device 4 performs, under a situation that power supply from battery 2 is intercepted by abnormalities of the strong electric system, restart operation control of the engine 5 such as fuel injection, intake, ignition timing, etc., in a condition that rotation of the engine 5 is maintained by inertia rotational energy of a motor generator 6 of the power generation device 3.

Description

  The present invention relates to a control device for an electric vehicle, and more particularly to power generation provided with a power generation device for extending the cruising distance of electric traveling (EV traveling) without being charged by an external power source even when the amount of charge of the battery decreases. The present invention relates to a control device for a device-mounted electric vehicle.

  As an electric vehicle equipped with a power generation device, Patent Document 1 discloses a technique in which a power generation device including an engine and a motor generator rotated by the engine is mounted.

Japanese Patent No. 3266056

  In the electric vehicle shown in Patent Document 1, when the amount of charge (SOC) of the battery becomes smaller than a certain set value, the power generator rotates the motor generator of the power generator as a motor with the battery, Power generation is performed by starting the engine with rotational energy.

  In such an electric vehicle, when an abnormality occurs in the high-power system such as an excessive voltage or an excessive current generated in the battery, it is necessary to shut off the power supply from the battery to each part and stop the high-power system. There is.

  However, in this case, in order to resume traveling of the vehicle, power is not supplied from the battery to the power generation device, so that a starter and a spare battery similar to those of a normal gasoline vehicle are required.

  Therefore, the present invention controls an electric vehicle capable of starting the engine without requiring a spare battery or the like and continuing the running of the vehicle by operating the power generation device even when the high-power system is stopped due to a battery abnormality or the like. A device is provided.

  In the control apparatus for an electric vehicle according to the present invention, a drive motor, a chargeable / dischargeable battery for supplying power to the drive motor, and power generation for supplying power to the drive motor or the battery are performed. A power generation device including an engine and a motor generator, and a control device that controls the drive motor, the battery, and the high power system of the power generation device are provided.

  This control device shuts off the power supply from the battery to the drive motor and / or the power generator when the high-power system is abnormal, and starts the engine using the inertial rotational energy of the drive motor or motor generator. The main feature is that the generator can be operated.

According to the present invention, even when the power supply from the battery to the drive motor and / or the power generation device is shut off due to abnormality of the battery and the high power system is stopped, the inertial rotational energy of the drive motor, the motor generator, etc. The engine can be started under use, and the vehicle can be continuously driven by operating the power generation device.

1 is a system configuration diagram showing a first embodiment of the present invention. The flowchart figure which shows the control action of the control apparatus of 1st Embodiment. The time chart figure which shows the change of engine rotation ranging from a stop of a high-power system to an engine restart. The time chart figure which shows the electric power generation state of the electric power generating apparatus ranging from a stop of a high-power system to engine restart. The flowchart figure which shows the control action of the control apparatus of 1st Embodiment. The flowchart figure which shows the control action of the control apparatus of 1st Embodiment. The system block diagram which shows 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The electric vehicle according to the first embodiment shown in FIG. 1 includes a drive motor 1 as a vehicle drive source, a chargeable / dischargeable battery 2 that supplies power to the drive motor 1, and the drive motor 1 or battery 2. And a control device 4 that controls the high-power system of the drive motor 1, the battery 2, and the power generation device 3.

  The drive motor 1 is directly connected to the power transmission device 8 of the drive wheel 7 and is controlled by the control device 4 according to a power running state in which torque is generated and a regenerative state in which the battery 2 is charged with regenerative energy during deceleration. Rotation control is performed.

  The battery 2 is charge / discharge controlled by the control device 4 to supply power to the drive motor 1 and the power generation device 3, charge control of power generated by the power generation device 3, and power regenerated during deceleration of the drive motor 1. Is done.

  The power generation device 3 uses a combination of the engine 5 and the motor generator 6. The control device 4 controls the operation control such as the fuel injection amount, the intake air amount, the ignition timing, etc. according to the operation load of the engine 5, and the motor. The rotation control according to the power generation state and power consumption state of the generator 6 is performed.

  The drive motor 1 is supplied with electric power from one or both of the battery 2 and the power generation device 3. When the battery 2 has sufficient energy for the required output of the drive motor 1, that is, when the charge amount of the battery 2 is sufficient, the drive motor 1 is driven by the power of the battery 2 and the power generator 3 operates. I'm trying not to be.

  On the other hand, when the energy of the battery 2 is less than the required output of the drive motor 1, or when the energy is below a predetermined set charge amount, the engine 5 is driven to drive the motor generator 6 to generate power. 3 is used for the driving power of the driving motor 1 and for charging the battery 2. Further, it is possible to supply the drive energy to the motor generator 6 and charge the battery 2 by the energy regeneration function when the vehicle of the drive motor 1 is decelerated.

When the charge amount of the battery 2 satisfies the required output of the drive motor 1 or when the battery 2 reaches a predetermined charge amount, the operation of the engine 5 of the power generator 3 is stopped, The power generation of the motor generator 6 is stopped. Further, when the charge amount of the battery 2 satisfies the required output of the drive motor 1 or when the battery 2 reaches a predetermined charge amount, the energy regeneration function when the vehicle of the drive motor 1 is decelerated is reduced. Like to stop.

  In the control mode of the high-power system of the driving motor 1, the battery 2, and the power generation device 3, in this embodiment, when an abnormality occurs in the high-power system, for example, an excessive current or an excessive voltage is generated in the battery 2. Then, the power supply from the battery 2 to the drive motor 1 and / or the power generator 3 is cut off, and the engine 5 is started using the inertial rotational energy of the drive motor 1 or the motor generator 6 to thereby generate the power generator 3. Can be operated.

  The abnormality detection of the battery 2 is performed by a current sensor or a voltage sensor (not shown) installed in the input / output circuit unit of the battery 2, for example. That is, when the current sensor detects the maximum current allowable for the electrical component, or when the voltage sensor detects the maximum voltage allowable for the electrical component or the lower limit voltage at which the battery 2 can be discharged, the battery 2 is abnormal. It is judged that it is.

  When the abnormality of the battery 2 is detected, the control device 4 turns off the main relay 9 installed in the charge / discharge circuit of the battery 2, disconnects the battery 2 from the electric circuit, stops the high-power system, or Charging / discharging is prohibited.

  At this time, when the drive motor 1 is driven by the electric power of the battery 2, the control device 4 sets the drive motor 1 in a regenerative state and supplies the regenerative energy to the motor generator 6. This is rotationally driven to control the starting operation of the engine 5. On the other hand, when the driving motor 1 is driven by the power generated by the power generator 3, the engine 5 is restarted while the rotation of the engine 5 is maintained by the inertial rotational energy of the motor generator 6. Operation control is performed.

  As described above, the control device 4 operates the power generation device 3 by starting the engine 5 with the fail-safe function even in a situation where the power supply from the battery 2 is interrupted due to an abnormality in the high-power system. Drive control of the drive motor 1 is performed by the generated power, and the vehicle can be continuously driven.

  An example of the control operation of the control device 4 will be described in detail below together with a flowchart.

  FIG. 2 shows a control flow when an abnormality of the battery 2 is detected when the power generator 3 is operated and the vehicle travels using the generated power or the battery 2 is charged.

  In step S11, abnormality of the battery 2 is determined by the above-described current sensor or voltage sensor. If an abnormality of the battery 2 is detected in step S11, the process proceeds to step S12.

  In step S12, based on the output of the rotation sensor installed in the engine 5 or the motor generator 6 of the power generation device 3, it is determined whether the motor generator 6 is in a rotational state necessary for restarting the engine 5, and the minimum lower limit rotational speed is determined. If it is above, it will progress to step S13. When the rotation of the motor generator 6 is the minimum lower limit, the process proceeds to step S15, and the rotation of the motor generator 6 is increased to the minimum number of rotations or more by using the power of the battery 2.

  In step S <b> 13, the main relay 9 is turned off to disconnect the battery 2 from the electric circuit, or charging / discharging of the battery 2 is prohibited to interrupt power supply to the drive motor 1 and / or the power generator 3. As a result, the high-power system is stopped and the operation of the engine 5 of the power generation device 3 is stopped. However, the engine 5 is maintained in a restartable rotational state by the inertial rotational energy of the motor generator 6.

  In step S14, the engine 5 is restarted by controlling the fuel injection amount, the intake air amount, the ignition timing, and the like under the rotation maintaining state of the engine 5 by the inertial rotational energy of the motor generator 6.

  FIG. 3 is a time chart showing changes in engine rotation from the stop of the high-power system to the restart of the engine 5.

  Thus, even when the high-voltage system is stopped by shutting off the power supply from the battery 2 to the drive motor 1 and / or the power generation device 3 due to the abnormality of the battery 2 during operation of the power generation device 3, the motor generator 6 This can be restarted while the engine 5 continues to rotate under the use of inertial rotational energy. As a result, there is no need for a dedicated starter or spare battery for starting the engine, and the operation of the power generator 3 by restarting the engine 5 causes the drive motor to move from the power generator 3 as shown in the time chart of FIG. It is possible to continue the running of the vehicle by supplying power to 1.

  In particular, in this embodiment, since the processing operation of the restart control of the engine 5 is executed before the high power system stops, the battery 2 is used when the inertial rotational energy of the motor generator 6 is insufficient as described above. The rotation of the motor generator 6 can be increased using the electric power of the engine 5 so that the engine 5 can be restarted appropriately.

  In addition, since the restart control is performed in a state where the rotation of the motor generator 6 is maintained at a rotational speed equal to or higher than the minimum lower limit necessary for engine restart, the engine 5 can be restarted with certainty.

  FIG. 5 shows a control flow when an abnormality of the battery 2 is detected while the vehicle travels by driving the drive motor 1 with the electric power of the battery 2.

  In step S21, abnormality of the battery 2 is determined by the above-described current sensor or voltage sensor. If an abnormality of the battery 2 is detected in step S21, the process proceeds to step S22.

  In step S22, the operation of the drive motor 1 is switched from the power running state to the regenerative state, and inertial rotational energy of the drive motor 1, that is, regenerative energy (electric power) is generated.

  In step S23, the main relay 9 is turned off to disconnect the battery 2 from the electric circuit, or charging / discharging of the battery 2 is prohibited to cut off the power supply to the drive motor 1 and / or the power generator 3.

  In step S24, the motor generator 6 is rotationally driven by the regenerative energy of the driving motor 1, and the engine 5 is rotated to the rotational speed necessary for starting the engine.

  In step S25, the engine 5 is started by controlling the fuel injection amount, the intake air amount, the ignition timing, and the like while the rotation of the engine 5 is maintained.

In this way, even when the vehicle 2 is running on a battery, even when the high-power system is stopped by shutting off the power supply from the battery 2 to the drive motor 1 and the power generation device 3 due to the abnormality of the battery 2, the drive motor The motor generator 6 can be rotated by the regenerative energy of 1, and the engine 5 can be started. Therefore, even in this case, there is no need for a dedicated starter or spare battery for starting the engine, and the operation of the power generator 3 by starting the engine 5 causes the power generator 3 to drive the motor 1. Electric power can be supplied to allow the vehicle to continue running.

  Of course, when the high-power system is stopped due to the abnormality of the battery 2 during the power generation running of the power generation device 3, the regenerative energy of the driving motor 1 is used for restarting the engine 5 described above. Is possible.

  Here, although the battery 2 is in an abnormal state while the vehicle is left unattended, the vehicle cannot be started or the engine 5 is started in the processing procedure of FIGS. It is conceivable that the engine 5 could not be started due to a defect or the like.

  FIG. 6 shows a control flow when the engine 5 is started using the regenerative energy of the drive motor 1 by pulling the vehicle in such a case.

  When the abnormality of the battery 2 is confirmed in step S31, and the vehicle is pulled or pushed into a running state while the high power system is stopped in step S32, the generation of regenerative energy of the drive motor 1 is determined in step S33. When the generation of regenerative energy of the driving motor 1 is confirmed in step S33, the motor generator 6 and the engine 5 using the regenerative energy of the driving motor 1 in step S24 and step S25 as in the control flow of FIG. , The operation control of the engine 5 is started, and the engine 5 is started.

  That is, it is possible to start the engine 5 by pushing or pulling a vehicle similar to a normal gasoline vehicle.

  FIG. 7 shows the system configuration of the second embodiment of the present invention.

  In the present embodiment, the power generated by the motor generator 6 due to the start of the engine 5 by executing each control flow described above can be controlled to be supplied to various in-vehicle electrical components in addition to the drive motor 1.

  In the state where the battery 2 is disconnected from the electric circuit or charging / discharging of the battery 2 is prohibited, when the engine 5 continues to be driven, a surplus is consumed than the power consumed by the power running operation of the driving motor 1. There is a need to.

  Therefore, in the present embodiment, the power generated by the power generation device 3 is supplied to, for example, the compressor 10 for air conditioner and the heater 11 for heating, and to the 12V in-vehicle electrical component 13 via the DC / DC converter 12. Like to do.

  Thereby, the surplus electric power can be appropriately processed to allow the vehicle to continue running.

DESCRIPTION OF SYMBOLS 1 ... Drive motor 2 ... Battery 3 ... Electric power generation apparatus 4 ... Control apparatus 5 ... Engine 6 ... Motor generator 10, 11, 12, 13 ... In-vehicle electrical component

Claims (6)

A drive motor;
A chargeable / dischargeable battery that supplies power to the drive motor;
A power generator comprising an engine and a motor generator for generating power for supplying power to the drive motor or battery;
A control device for controlling the drive motor, the battery, and the high power system of the power generator, and
The control device shuts off the power supply from the battery to the drive motor and / or the power generator when the high-power system is abnormal, and uses the inertial rotational energy of the drive motor or motor generator. A control device for an electric vehicle, wherein the power generation device is operable by starting the engine.   The engine start control by the control device is performed while the rotation of the engine is continued by the inertial rotational energy of the motor generator when the operation of the engine is stopped due to an abnormality of the high power system. It is restart control, The control apparatus of the electric vehicle of Claim 1 characterized by the above-mentioned.   The electric vehicle control device according to claim 2, wherein the restart control of the engine is performed before the high-power system stops.   The electric vehicle control device according to claim 2 or 3, wherein the restart control of the engine is performed before the actual engine speed falls below a speed required for starting the engine.   5. The control device performs start control of the engine by setting the drive motor in a regenerative state and causing the motor generator to be rotationally driven by regenerative energy of the drive motor. The control apparatus of the electric vehicle as described in any one of these.   6. The control device according to claim 1, wherein the control device can control supply of electric power generated by the motor generator by starting the engine to various in-vehicle electrical components in addition to the driving motor. The control apparatus of the electric vehicle as described in any one.

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