Multiplexed hydraulic control system with plural selector valves

Motors: expansible chamber type – Working member position feedback to motive fluid control – Electrical input and feedback signal means

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Details

91378, 91521, 91523, 91529, F15B 909

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active

050543695

ABSTRACT:
A multiplexed hydraulic control system having a plurality of channels and a common source of modulated hydraulic fluid. The common source is shared among the plurality of channels by providing a plurality of selector valves, one for each channel, with electrical solenoids for the selector valves being individually controlled by a control means. In a normal operating mode, the selector valves are operated individually and the modulating means is controlled to direct fluid to the selected channel in accordance with the demands placed on movement of the actuator in that channel. In a second slewing mode, multiple selector valves are energized at the same time and the modulator is controlled to produce sufficient fluid flow to slew all of the actuators in the selected channels at a desired rate.

REFERENCES:
patent: 3645141 (1972-02-01), Moore et al.
patent: 3968730 (1976-07-01), Lionet
patent: 4191215 (1980-03-01), Gonner
patent: 4271867 (1981-06-01), Milberger et al.
patent: 4325127 (1982-04-01), Major
patent: 4664136 (1987-05-01), Everett
patent: 4712173 (1987-12-01), Fujiwara et al.
patent: 4913032 (1990-04-01), Wernberg
patent: 4986305 (1991-01-01), Richards et al.
"Imagine . . . A Self-Calibrating Pressure Transducer" advertisement for Scanivalve Corp., San Diego, Calif., 1987.
"Metering Valve W/Regulator" article, Tech Data South Bend Controls Inc. Bulletin, PV-210, SBC, 1987.
"Metering Valve" article, Tech Data South Bend Controls Inc. Bulletin, PV-211, SBC, 1987.
Article entitled "Actuator Accepts Electrical Digital Control Signals Directly--Eliminates Digital-To-Analog Converters".

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