Motor-operated power steering apparatus

Details Motor-operated power steering apparatus Motor-operated power steering apparatus

1988-01-21

1989-01-24

Mitchell, David M.

Motor vehicles

Compensating devices

B62D 504

Patent

active

047995661

ABSTRACT:
A motor-operated power steering apparatus having a failure diagnosis function for a motor control device includes a steering force transmitting mechanism for transmitting a manual steering force applied to a steering wheel to a steerable road wheel, an electric motor for generating assistive power, an auxiliary power transmitting mechanism for transmitting the assistive power generated by the electric motor to the steering force transmitting mechanism, motor control means for controlling operation of the electric motor in response to the manual steering force, first direction detecting mechanism disposed in the steering force transmitting mechanism for detecting the direction of the manual steering force and generating a signal indicative of the direction of the manual steering force, second direction detecting mechanism for detecting the direction of the assistive power generated by the electric motor and generating a signal indicative of the direction of the assistive power, ascertaining mechanism for ascertaining whether the direction of the manual steering force and the direction of the assistive power are the same as each other based on the signals from the first and second direction detecting mechanisms, and assistive power interrupting means for de-energizing the motor when the direction of the manual steering force and the direction of the assistive power are different from each other.

REFERENCES:
patent: 4458795 (1984-07-01), Norton
patent: 4532567 (1985-07-01), Kade
patent: 4724917 (1988-02-01), Naito et al.
patent: 4745985 (1988-05-01), Nakayama et al.

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