Four wheel steer system with fail-safe control

Details Four wheel steer system with fail-safe control Four wheel steer system with fail-safe control

1986-08-05

1987-08-18

Love, John J.

Land vehicles

Wheeled

Running gear

180140, B62D 500

Patent

active

046872140

ABSTRACT:
A vehicle is provided with a system for steering front wheels, a system for steering rear wheels, a vehicle speed sensor and a controller. By sending a command signal to the rear wheel steering system, the controller steers the rear wheels in an in-phase mode in which the rear wheel steer direction is the same as the front wheel steer direction when the vehicle speed is high, and in a fixed mode in which the rear wheels are not steered at all or in an opposite phase mode in which the rear wheel steer direction is opposite to the front wheel steer direction when the vehicle speed is low. There is further provided with means for detecting a failure in the rear wheel steering system, vehicle speed and controller. The controller is arranged to steer the rear wheels always in the in-phase mode irrespectively of the vehicle speed if a failure is detected.

REFERENCES:
patent: 4293051 (1981-10-01), Nishikawa
patent: 4579186 (1986-04-01), Uno et al.
patent: 4588039 (1986-05-01), Uno et al.

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