Rear wheel steering system having toe error compensation

Details Rear wheel steering system having toe error compensation Rear wheel steering system having toe error compensation

1990-01-25

1991-06-25

Bertsch, Richard A.

Land vehicles

Wheeled

Running gear

280 99, 280661, B62D 714

Patent

active

050260812

ABSTRACT:
A rear wheel steering mechanism capable of independently positioning the rear wheels of a vehicle also independently corrects the toe error of each steered wheel. In the preferred embodiment, each rear wheel is steered by a separate actuator. The overall steering command for the actuators is determined at least in relation to the front steering angle, the command being constrained within predefined command limits. The actuators, on the other hand, have a control range which exceeds that of the predefined command limits. The controller which generates the steering commands is adapted to receive and store signals representing the toe error of each rear wheel from a conventional wheel alignment machine, and the controller causes the actuator to position each rear wheel as a combined function of the steering command and the respective stored toe error signals. When realignment becomes necessary, an alignment machine is connected to the controller, and the system enters a reset mode in which the rear wheels are steered to a "straight ahead" position independent of the previously stored toe error values, and the newly measured toe error values are stored for future steering control.

REFERENCES:
patent: 4614359 (1986-09-01), Lundin et al.
patent: 4695073 (1987-09-01), Pettibone et al.
patent: 4874183 (1989-10-01), Chikuma et al.

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