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Four-wheel steering device for vehicle

  • US 4,828,064 A
  • Filed: 06/24/1987
  • Issued: 05/09/1989
  • Est. Priority Date: 06/06/1984
  • Status: Expired due to Fees
First Claim
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1. A method of controlling a four-wheel steering system for a vehicle including a vehicle speed sensor, a front wheel steering means, means for generating a signal representative of the turning angle of the front wheels, means for obtaining the rear wheel turning angle in response to the turning angle of the front wheels and the vehicle speed, and means for turning the rear wheels, the method comprising:

  • detecting actuation of the front wheel steering means;

    detecting the vehicle speed sensed by the vehicle speed sensor;

    obtaining by a computing means the ratio of the rear wheel turning angle to the front wheel turning angle in response to said detected vehicle speed where said ratio is such that, at a predetermined steering wheel operating speed, the vehicle response to (a) lateral acceleration and (b) heading are substantially equal for (i) a first range of detected vehicle speeds where the front and rear wheels are turned in the reverse phase with respect to each other and (ii) a second range of detected vehicle speeds faster than the first range of speeds where the front and rear wheels are turned in the same phase; and

    turning the rear wheels through a turning angle determined by the obtained value of the ratio of the rear wheel angle to the front wheel turning angle and said turning angle of the front wheels.

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