Control in a vehicle four wheel steering system

Details Control in a vehicle four wheel steering system Control in a vehicle four wheel steering system

1987-08-26

1989-10-17

Pekar, John A.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

280 91, B62D 506

Patent

active

048740543

ABSTRACT:
A vehicle four wheel steering system including a front wheel steering mechanism for steering the front wheels in response to an operation of a manually operated steering member, a rear wheel steering mechanism for steering rear wheels in response to a steering movement of the front wheel. A control unit is provided for changing the steering ratio of the rear wheel steering angle to the front wheel steering angle in accordance with the vehicle speed. The steering ratio is further modified so that the rear wheel steering angle is added with a modification angle in the direction opposite to the direction of steering of the front wheel, the modification angle being increased in response to an increase in the side force on the vehicle.

REFERENCES:
patent: 2910131 (1959-10-01), Krotz
patent: 4175638 (1979-11-01), Christensen
patent: 4313514 (1982-02-01), Furukawa et al.
patent: 4645025 (1987-02-01), Ohe et al.

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