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Control apparatus for hybrid vehicles

  • US 20020108794A1
  • Filed: 04/17/2002
  • Published: 08/15/2002
  • Est. Priority Date: 09/22/1999
  • Status: Active Grant
First Claim
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1. A control apparatus for a hybrid vehicle comprising an engine for outputting a driving force of the vehicle;

  • a motor for generating an auxiliary driving force for assisting the output of the engine;

    a battery device for supplying electric power to the motor and for storing regenerative energy obtained by a regenerative operation of the motor at the time of supplying electric power to the motor during deceleration of the vehicle;

    an assist determination device for determining whether it is necessary for the motor to assist the engine output in response to the driving condition of said vehicle;

    an assist amount determination device for determining the assist amount of the engine output by the motor in response to the engine driving conditions when an assist of the engine output is determined by said assist determination device;

    an assist control device for assisting the output of said engine by said motor based on the assist amount determined by said assist amount determination device;

    wherein said control apparatus of the hybrid vehicle comprises;

    a travel start detecting device for detecting the travel start of the vehicle;

    a state of charge detecting device for detecting the state of charge of said battery device;

    a discharge depth detecting device for detecting a discharge amount of the present state of charge by comparison with the initial state of charge detected at the time of starting the travel;

    a lower limit threshold value setting device for setting the lower limit threshold value of the discharge amount when compared with said initial state of charge;

    an upper limit threshold value setting device for setting the upper limit threshold value of the discharge amount when compared with said initial state of charge;

    a mode setting device for changing the control mode of said motor when the state of charge of the battery device is reduced to said lower limit threshold value; and

    a mode setting release device for releasing the setting of the motor control mode set by said mode setting device when the state of charge of the battery device reaches said upper limit threshold value;

    a determination threshold correction device for correcting the engine output determination threshold used as a standard for determination by said assist determination device in response to the discharge depth detected by said discharge depth detecting device when the motor control mode is changed by said mode setting device.

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