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Rear wheel steering apparatus

  • US 4,884,647 A
  • Filed: 11/30/1987
  • Issued: 12/05/1989
  • Est. Priority Date: 02/28/1984
  • Status: Expired due to Fees
First Claim
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1. A rear wheel steering apparatus for a vehicle having steerable front and rear wheels comprising:

  • driving condition detecting means including,front wheel steering angle detecting means for detecting a front wheel steering angle of said vehicle and generating a signal corresponding to the front wheel steering angle, andrear wheel steering angle detecting means for detecting a rear wheel steering angle of the vehicle and generating a signal corresponding to the rear wheel steering angle;

    rear wheel steering control means for steering said rear wheels, including,a first cylinder housing,a first piston member adapted to reciprocate within said cylinder housing and coupled to the rear wheels,a selector control valve for selectively causing a pressure source and a tank to communicate with two chambers defined in said first cylinder housing by said piston member, anda steering mechanism which is arranged between said selector control valve and said two chambers and which has check valves allowing a flow-in operation for one of said two chambers and simultaneously a flow-out operation for the other of said two chambers, said steering control means being adapted to control said steering mechanism; and

    rear wheel steering control means including,discriminating means for discriminating a difference between said front and rear wheel steering angle signals from said front and rear wheel steering angle detecting means, andsteering control means, responsive to said decriminating means, for supplying a steering signal to said rear wheel steering means to eliminate the difference between said front and rear wheel steering angles when the difference exceeds a predetermined value.

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