Power steering control apparatus

Details Power steering control apparatus Power steering control apparatus

1984-10-24

1986-02-11

Peters, Jr., Joseph F.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

B62D 506

Patent

active

045694117

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 conduction current of the proportional solenoid is interrupted by the electric control circuit whereby the reaction oil pressure is increased to cause the steering to become heavy. This function is performed by a failsafe circuit in the electric control circuit which monitors the error between the car speed inverse proportional signal and a feedback signal from the solenoid and then holds the abnormal condition when the error exceeds a 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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