Electric power steering system

Details Electric power steering system Electric power steering system

1988-05-24

1989-06-27

Pekar, John A.

Motor vehicles

Compensating devices

180142, B62D 504

Patent

active

048420883

ABSTRACT:
A system having a motor operatively connected to a steering system for reducing the steering effort. The system is provided with a torsion torque sensor provided for detecting torsion torque generating in the steering system in steering operation. In response to the output signal of the torsion torque sensor, an assist signal and an auxiliary assist signal are produced. A detector is provided for detecting whether a variation value of the torsion torque is in an increasing direction or in a decreasing direction and for producing a direction signal dependent on the detected direction. When a direction signal representing the variation value of the torsion torque in the decreasing direction is generated, the auxiliary assist signal is reduced in value, thereby reducing a total assist signal of the assist signal and the auxiliary assist signal.

REFERENCES:
patent: 4664211 (1987-08-01), Oshita et al.
patent: 4754828 (1988-07-01), Morishita et al.

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