Device for determining malfunctioning of electric-motor-assisted

Details Device for determining malfunctioning of electric-motor-assisted Device for determining malfunctioning of electric-motor-assisted

1990-07-23

1991-11-12

Chin, Gary

Boots, shoes, and leggings

36442403, 180 791, 180142, B62D 504

Patent

active

050653253

ABSTRACT:
In an electric-motor-assisted power steering system of a motor vehicle, malfunctioning of a steering angle sensor is detected reliably even when the sensor generates an erroneous output signal of a moderate magnitude. When the vehicle speed is above a predetermined value, the steering force is below a predetermined value and the steering quantity is below a predetermined value and when such conditions continue to exist for a predetermined time, it is determined that the vehicle is driven straight ahead. If a detected steering angle is above a predetermined value even when the straight ahead condition of the vehicle is determined, an abnormality determining section produces an alarm output signal indicating that there is a malfunction.

REFERENCES:
patent: 4720791 (1988-01-01), Daido
patent: 4803629 (1989-02-01), Noto et al.
patent: 5001637 (1991-03-01), Shiraishi et al.

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