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Electric drive vehicle

  • US 8,523,296 B2
  • Filed: 01/26/2007
  • Issued: 09/03/2013
  • Est. Priority Date: 03/24/2006
  • Status: Active Grant
First Claim
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1. An electric drive vehicle comprising:

  • an induction motor for braking or driving wheels;

    a power converter for driving the induction motor;

    a motor controller for controlling the power converter to control the induction motor;

    mechanical brakes for braking the wheels;

    an acceleration pedal for the vehicle; and

    a shift lever for determining a traveling direction of the vehicle;

    wherein the power converter outputs a voltage corresponding to a current command from the motor controller, and while the shift lever is at a forward (F) position and the accelerator pedal is not depressed, the motor controller gives a constant current command and a frequency command to make the frequency of electric power for driving the induction motor zero to the power converter so that the power converter outputs a DC voltage based on the current and frequency commands wherein constant current flows through the stator of the induction motor to make the induction motor generate torque for stopping the vehicle and maintain the vehicle in a halt state, andwherein under conditions in which the shift lever is at a forward position, the accelerator pedal is not depressed and the mechanical brakes are released, the motor controller generates a command signal including a current command and a zero frequency command and the command signal is supplied to the power converter and, based on the command signal, the power converter controls the induction motor, so that the stator current of the induction motor is maintained in a constant DC current value and an output torque of the induction motor varies depending on a slip frequency of the induction motor.

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