Motor-driven power steering system for a vehicle

Details Motor-driven power steering system for a vehicle Motor-driven power steering system for a vehicle

1987-06-08

1988-10-18

Love, John J.

Motor vehicles

Compensating devices

192 002R, 192 84R, B62D 504

Patent

active

047780215

ABSTRACT:
A motor-driven power steering system for a vehicle capable of preventing or substantially reducing generation of shocks and noises when the steering system is changed from a power steering mode into a manual steering mode or vice versa. A motor is operatively connected with steerable road wheels and adapted to be energized by a power source to transmit a force to the steerable road wheels for power assisting steering motion caused by the operator through a steering wheel. An electromagnetic hysteresis clutch is interposed between the motor and the steerable road wheels for electromagnetically connecting the motor with the steerable road wheels in such a manner that the power-assisting force transmitted from the motor to the steerable road wheels is continuously changed in accordance with an exciting current supplied to the clutch. A control unit receives output signals representing operator-induced steering torque and vehicle speed for controlling the respective running and switching operations of the motor and the electromagnetic hysteresis clutch in accordance therewith.

REFERENCES:
patent: 4639651 (1987-01-01), Shimizu
patent: 4687976 (1987-08-01), Shimizu

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