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Rear wheel steering system for vehicle

  • US 5,386,365 A
  • Filed: 03/19/1992
  • Issued: 01/31/1995
  • Est. Priority Date: 03/22/1991
  • Status: Expired due to Fees
First Claim
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1. A rear wheel steering system for a vehicle comprising:

  • turning state detecting means for physically detecting a turning state of the vehicle;

    yaw rate feedback control means for controlling a steering angle of rear wheels so that a yaw rate detected by the turning state detecting means is made equal to a target yaw rate;

    a second rear wheel steering angle control means adapted for controlling the steering angle of the rear wheels based on a control mode different from that of the yaw rate feedback control means; and

    a control mode selection means for causing the second rear wheel steering angle control means to control the steering angle of the rear wheels when the vehicle is turning with a turning radius smaller than a first predetermined turning radius and causing the yaw rate feedback control means to control the steering angle of the rear wheels when the vehicle is turning with a turning radius equal to or greater than the first predetermined turning radius;

    wherein the control mode selection means causes the yaw rate feedback control means to control the steering angle of the rear wheels when, during control of the steering angle of the rear wheels by the second rear wheel steering angle control means, an absolute value of a deviation between the detected yaw rate and the target yaw rate begins to decrease.

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