Electro-hydraulic proportional actuator

Details Electro-hydraulic proportional actuator Electro-hydraulic proportional actuator

1980-05-12

1984-05-29

Maslousky, Paul E.

Motors: expansible chamber type

Independently operated timer, delay, pattern or cyclic control

91363R, 91446, 91465, F15B 2102, F15B 903, F15B 909

Patent

active

044507534

ABSTRACT:
An electro-hydraulic proportional actuator in which the actuator piston position is hydraulically controlled by fluid flow through solenoid valves operable by an electronic control system. An operator control provides an input voltage representing a desired piston position and a transducer generates a voltage representing the actual piston position. The difference between the input and output voltages generates a difference or error signal that is fed into a feedback system including a sample-and-hold circuit. A clock logic system is provided for transmitting the signal from the feedback system to the solenoid valves at predetermined intervals to activate either valve to move the actuator piston in either direction or to activate both valves to hold the piston at a desired position.

REFERENCES:
patent: 3763745 (1973-10-01), Anderson
patent: 3802318 (1974-04-01), Sibbald

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