Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1985-09-12
1988-01-19
Mitchell, David M.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
180142, 280 91, B62D 506
Patent
active
047199814
ABSTRACT:
A four-wheel steering system for a vehicle comprises a steering wheel, a front wheel turning mechanism for turning front wheels in response to operation of the steering wheel, and a rear wheel turning mechanism which turns rear wheels in response to operation of the steering wheel and is provided with an electric actuator for changing the position of a movable member the position of which determines a rear wheel turning angle ratio which is the ratio of the turning angle of the rear wheels to the turning angle of the front wheels for a given turning angle of the steering wheel. A control circuit receives a vehicle speed signal from a vehicle speed sensor and controls the electric actuator according to the detected vehicle speed so that a target rear wheel turning angle ratio determined in advance according to the vehicle speed is obtained. A preset vehicle speed detector detects a preset vehicle speed and a rear wheel turning angle ratio detector detects the actual rear wheel turning angle ratio. A correction circuit which receives signals from the preset vehicle speed detector and the rear wheel turning angle ratio detector and controls the electric actuator to change the position of the movable member so that the actual rear wheel turning angle ratio coincides with the target rear wheel turning angle ratio at said preset vehicle speed.
REFERENCES:
patent: 4418780 (1983-12-01), Ito
patent: 4441572 (1984-04-01), Ito
patent: 4552239 (1985-11-01), Kanazawa
patent: 4566709 (1986-01-01), Sano
patent: 4566710 (1986-01-01), Furukawa
patent: 4572316 (1986-02-01), Kanazawa
Ferguson Jr. Gerald J.
Foycik, Jr. Michael J.
Hoffman Michael P.
Mazda Motor Corporation
Mitchell David M.
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