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Control apparatus and control method for motor drive vehicle

  • US 5,355,749 A
  • Filed: 12/17/1992
  • Issued: 10/18/1994
  • Est. Priority Date: 12/20/1991
  • Status: Expired due to Term
First Claim
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1. A control apparatus of a vehicle driven by an electric motor, comprising:

  • means for generating a target vehicle speed according to an operator input of an accelerator device;

    vehicle speed control means, having means for detecting actual speed of said vehicle and means for calculating difference between said target vehicle speed and the actual vehicle speed, for controlling a vehicle speed so as to make the difference zero;

    motor speed instruction means for receiving an instruction value corresponding to a value of said different and for generating a target motor speed according to a predetermined high efficiency pattern whereon maximum efficiency points are plotted in relation to the motor speed values and motor power values obtained from values of said difference;

    motor control means for receiving said target motor speed from said motor speed instruction means and driving said electric motor in said target motor speed;

    variable transmission means for receiving output of said electric motor and varying rotation speed of said output of the motor in a transmission ratio instructed so as to transfer the rotation to a drive shaft of said vehicle; and

    transmission ratio calculating means for determining said transmission ratio on the basis of said target vehicle speed and said target motor speed and instructing said transmission ratio to said variable transmission means.

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