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Fail-safe control apparatus for electric vehicle driving motor

  • US 5,689,170 A
  • Filed: 12/27/1995
  • Issued: 11/18/1997
  • Est. Priority Date: 12/27/1994
  • Status: Expired due to Term
First Claim
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1. A fail-safe control apparatus for an electric vehicle driving motor, comprising:

  • first control means forcalculating and outputting an absolute value of amplitude and a phase angle of a motor primary current and a motor primary frequency in response to an accelerator signal corresponding to the position of an accelerator and a speed signal representing a speed of the vehicle driving motor; and

    outputting a torque current and an exciting current which are intermediate results of the calculation;

    pulse width modulation control means forreceiving and two-phase/three-phase-converting the torque current and the exciting current; and

    in response to the converted three-phase torque and exciting currents and a three-phase current for driving and controlling the drive motor, outputting a PWM signal for controlling said drive motor by a pulse width;

    torque estimation means forreceiving the same three-phase current as that of said three-phase current input to said pulse width modulation control means; and

    three-phase/two-phase-converting the three-phase current by using the phase angle output from said first control means to calculate and output an estimation value of the torque current and an estimation value of the exciting current;

    second control means forcalculating and outputting an absolute value of amplitude and a phase angle of a motor primary current and a motor primary frequency in response to an accelerator signal corresponding to the position of an accelerator and a speed signal representing a speed of the vehicle driving motor; and

    outputting a torque current and an exciting current which are intermediate results of the calculation;

    first comparison means forcomparing the absolute value of amplitude and the phase angle of the motor primary current and the motor primary frequency which are output from said first control means with the absolute value of amplitude and the phase angle of the motor primary current and the motor primary frequency which are output from said second control means, respectively; and

    outputting a fail-safe signal when said first comparison means determines that magnitudes of differences between the outputs from said first and second control means have values not less than a predetermined value for a predetermined period of time; and

    second comparison means forcomparing the estimation value of the torque current and the estimation value of the exciting current which are output from said torque estimation means with the torque current and the exciting current which are output from said second control means, respectively; and

    outputting a fail-safe signal when the second comparison means determines that the magnitudes of the differences have values not less than a predetermined value for a predetermined period of time.

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