Electric power steering system

Details Electric power steering system Electric power steering system

1989-03-09

1990-03-20

Marmor, Charles A.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

180 791, 180146, B62D 504

Patent

active

049093436

ABSTRACT:
A hydraulic power steering system is disclosed which has a steering control valve operatively connected to a steering shaft to be actuated by the torsional torque exerted thereon by a steering wheel, and a hydraulic cylinder operated by the control valve for assisting the steering of the vehicle. An electric motor drive unit is coupled to the steering shaft for exerting torque thereto in a direction for returning the steering wheel to a straight ahead position. An electronic control circuit is connected to the motor drive unit for exerting a variable amount of return torque to the steering shaft according to the steering angle of the steering shaft, or to both the steering angle and the travelling speed of the vehicle.

REFERENCES:
patent: 4703821 (1987-11-01), Shimizu
patent: 4745985 (1988-05-01), Nakayama et al.
patent: 4800975 (1989-01-01), Oshita et al.
patent: 4834203 (1989-05-01), Takahashi et al.

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