Electric motor-driven power steering apparatus

Details Electric motor-driven power steering apparatus Electric motor-driven power steering apparatus

1988-04-13

1989-09-26

Hill, Mitchell J.

Motor vehicles

Compensating devices

36442405, B62D 504, B62D 530

Patent

active

048693340

ABSTRACT:
The steering power assist control comprises a main assist control and an auxiliary assist control. When an abnormality occurrence signal from the main assist control is inputted to an abnormality state detection and changing decision circuit 134, the selector circuit changes the PWM signal from the main assist control side to the auxiliary assist control side and outputs the PWM signal to a motor drive circuit. When the main assist control fails, the auxiliary assist control immediately takes over the main assist control to provide, if the operation condition permits, a continued steering power assist control. This prevents an abnormal steering state of the vehicle that would otherwise result when the steering power assist is suddenly lost.

REFERENCES:
patent: 4724917 (1988-02-01), Naito et al.

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