Power steering control apparatus

Details Power steering control apparatus Power steering control apparatus

1984-11-13

1986-01-07

Pekar, John A.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

B62D 506

Patent

active

045628963

ABSTRACT:
A power steering control apparatus for a car in which, under normal conditions, the steering becomes heavy as the speed of the car increases for the purpose of safety. This is realized by means of a hydraulic valve controlled by the reaction oil pressure of a proportional solenoid in the steering mechanism. In an abnormal condition such as the shortcircuit between solenoid coils or the failure of an electric control circuit, the proportional solenoid is deenergized through a failsafe circuit due to the fact that a feedback signal from the solenoid has become zero and the error with a high amplification gain between the car speed inverse proportional signal and the feedback signal has exceeded a first predetermined value. On the occasion of the voltage reduction of the power source for the electric control circuit and/or the increased temperature of the proportional solenoid, the failsafe circuit is disabled by an error protection circuit only when the difference between the car speed inverse proportional signal and the reduced feedback signal exceeds a second predetermined value.

REFERENCES:
patent: 3820619 (1974-06-01), Ezoe et al.
patent: 4392540 (1983-07-01), Michio et al.
patent: 4476529 (1984-10-01), Nakamura et al.

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