Four wheel steering system with speed-dependent phase reversal

Details Four wheel steering system with speed-dependent phase reversal Four wheel steering system with speed-dependent phase reversal

1991-02-19

1993-06-29

Lall, Parshotam S.

Boots, shoes, and leggings

180142, 180140, 280 91, B62D 504

Patent

active

052240428

ABSTRACT:
A four wheel steer control system which uses vehicle speed, front wheel position, and the rate of change of the front wheel position to develop the rear wheel steering command. The rear steering command is a combination of the steady state and transient rear wheel commands which are developed individually. The rear wheel steady state command is a function of vehicle speed and front wheel position. The rear wheel transient command is a function of the rate of change of the front wheel position and vehicle speed. Determining the rate of change of front wheel position is done by taking samples of the front wheel position over time and calculating the difference in position between consecutive samples. As the vehicle speed changes the number of differences which are used to calculate the rate of change varies, allowing for the constant tuning of the response time of the rear wheels, resulting in a vehicle which is optimized for response and stability over the entire range of vehicle speeds.

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"Development of `Super HICAS`, a New Rear Wheel Steering System with Phasereversal Control", Eguchi et al, SAE Tech. Paper Series #891978, Sep. 1989.
"A Review of Four-Wheel Steering Studies from the Viewpoint of Vehicle Dynamics and Control", Furukawa et al, Vehicle System Dynamics, No. 18, pp. 151-186 (Dec. 1989).

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