Pump-drive device of power-assisted steering system

Details Pump-drive device of power-assisted steering system Pump-drive device of power-assisted steering system

1983-03-11

1985-05-21

Peters, Jr., Joseph F.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

74388PS, B62D 508

Patent

active

045180555

ABSTRACT:
A pump-drive device of a power-assisted vehicle steering system, comprising a motor operative to drive a steering pressure pump, a first sensor for detecting vehicle speed and producing an output signal representative of the detected vehicle speed, a second sensor for detecting the motor output speed and producing an output signal representative of the detected motor output speed, a current control circuit responsive to the output signals from the first and second sensors, a main current supply line connected between a power source and the motor through the current control circuit, a bypass current supply line bypassing the current control circuit between the power source and the motor, the current control circuit being operative to produce an output signal to vary the current to be passed through the main current supply line on the basis of the output signals from the first and second sensors, a detecting unit responsive to a predetermined operative condition of the steering system and operative to produce an output signal when the steering system is in the predetermined operative condition, and a line shifting switch unit to provide electrical connection selectively between the power source and the motor selectively through the main and bypass current supply lines in the absence and presence, respectively, of the output signal from the detecting unit.

REFERENCES:
patent: 4056160 (1977-11-01), Abels et al.
patent: 4300650 (1981-11-01), Weber
patent: 4396083 (1983-08-01), Wemberg

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