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Method and device for rear-wheel steering of automotive vehicle

  • US 5,014,801 A
  • Filed: 02/09/1989
  • Issued: 05/14/1991
  • Est. Priority Date: 02/10/1988
  • Status: Expired due to Fees
First Claim
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1. A method of steering rear wheels for an automotive vehicle having a front-wheel steering system and a rear-wheel steering system, which method comprises:

  • providing a first detection signal indicative of front-wheel steering force;

    providing a second detection signal indicative of front-wheel steering speed;

    providing a third detection signal indicative of a rear-wheel steering angle;

    providing a fourth detection signal indicative of vehicle speed;

    computing a rear-wheel steering angle reference value and a desired rear-wheel steering speed value based upon said first through fourth detection signals;

    steering the rear wheels in accordance with said rear-wheel steering angle reference value and said desired rear-wheel steering speed value;

    detecting whether there is a discrepancy between front-wheel steering force indicated by said first detection signal and front-wheel steering speed indicated by said second detection signal; and

    determining an abnormality when a discrepancy is detected between said first and second detection signals;

    said computing step comprising the steps of (a) computing a rear-wheel steering angle reference value from said first and fourth detection signals, (b) computing a first reference value from said second and fourth detection signals, (c) computing a second reference value from said rear-wheel steering angle reference value and said third detection signal, and (d) computing said desired rear-wheel steering speed value based upon said first reference value and said second reference value.

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