Electrohydraulic regulating device having pulse width modulating

Details Electrohydraulic regulating device having pulse width modulating Electrohydraulic regulating device having pulse width modulating

1993-06-19

1995-10-03

Ryznic, John E.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91459, 91462, F15B 1108, F15B 13044

Patent

active

054542910

ABSTRACT:
An electrohydraulic regulating device, particularly for a motor vehicle rear axle steering assembly, includes an adjusting cylinder. An electrically actuated control valve controls a hydraulic fluid flow to the adjusting cylinder. At least one electrically actuated switching valve blocks or admits a hydraulic fluid flow. A control unit generates control signals for the control valve and the switching valve. A regulating circuit supplies a pulse-width-modulated regulating signal for regulating a mean current of the control valve. A pulse-width-modulated control signal controls a mean current of the switching valve. The same supply voltage is applied to the switching valve and to the control valve. A pulse-duty factor of the control signal for the switching valve is referred to a pulse-duty factor of an adjusting signal for the control valve.

REFERENCES:
patent: 3943824 (1976-03-01), Fletcher
patent: 4120233 (1978-10-01), Heiser et al.
patent: 4136600 (1979-01-01), Heiser
patent: 4770264 (1988-09-01), Wright et al.

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