Fail-safe rear wheel steering system for vehicle

Details Fail-safe rear wheel steering system for vehicle Fail-safe rear wheel steering system for vehicle

1989-07-05

1991-09-17

Marmor, Charles A.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

280 91, 36442405, B62D 508

Patent

active

050486276

ABSTRACT:
A fail-safe vehicle rear wheel steering control system includes a hydraulic actuator for steering the rear wheels, an electromagnetic control valve for controlling fluid pressure of the actuator in accordance with a control signal, and a controller for controlling the rear wheel steer angle by producing the control signal. This fail-safe control system is characterized by a fail-safe cutoff valve disposed between the actuator and the control valve, and a fail-safe controller independent from the main controller. When the main controller or the control valve fails, the fail-safe controller brings the fail-safe valve to a closed position, and therefore, the fail-safe valve prevents an abrupt change of the rear wheel steer angle, and instead gradually allows a decrease of the rear wheel steer angle to zero by allowing a gradual leakage of the oil under pressure from the actuator.

REFERENCES:
patent: 4657102 (1987-04-01), Kanazawa
patent: 4687214 (1987-08-01), Uno
patent: 4770264 (1988-09-01), Wright et al.

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