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

1987-04-29

1988-07-05

Pekar, John A.

Motor vehicles

Compensating devices

364424, B62D 504

Patent

active

047548282

ABSTRACT:
A motor-driven power steering system for a vehicle having a motor operatively connected to the steerable road wheels of the vehicle and a clutch arrangement interposed therebetween for selectively establishing and interrupting the transmission of power-assisting force from the motor to the road wheels in accordance with vehicle speed and operator-induced steering torque resulting from the steering force exerted on the steering wheel. The current to be supplied to the motor and the clutch arrangement for controlling the respective running and switching operations thereof is calculated on the basis of a value which corresponds to the detected steering torque and a prescribed constant which corresponds to the rate of change for the steering torque so that fluctuations in the steering torque due to time lags in operation of various component members can be substantially suppressed or reduced, thus preventing resultant vibrations of the steering system for a smooth and stable steering operation.

REFERENCES:
patent: 4651840 (1987-03-01), Shimizu et al.
patent: 4660669 (1987-04-01), Shimizu

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