Electrohydraulic valve system

Details Electrohydraulic valve system Electrohydraulic valve system

1990-01-22

1992-03-17

Kwon, John T.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

91363R, 91364, 91429, 91448, 91457, 91461, F15B 13043

Patent

active

RE0338460

ABSTRACT:
A control system for controlling a double-acting cylinder includes four pilot-operated, proportional-type poppet valves for controlling fluid flow between the cylinder, a pump and a reservoir. Four solenoid-controlled pilot valves operate the poppet valves in response to error signals generated by a control circuit. The control circuit receives a cylinder position feedback signal and an operator-generated command signal. The control circuit provides for float, shutdown, variable deadband and pressure adjustment operation.

REFERENCES:
patent: 1666748 (1928-04-01), Mickley
patent: 3151455 (1964-10-01), Tennis
patent: 3714868 (1973-02-01), Kowalski et al.
patent: 3954046 (1976-05-01), Stillhard
patent: 4250794 (1981-02-01), Haak et al.
patent: 4282711 (1981-08-01), Branstetter
patent: 4316486 (1982-02-01), Tandrup et al.
"Electrohydraulics for Remote Control", Design Engineering, Jun. 1981, pp. 57-63.
"Third Fluid Mechanism Colloquium at Aachen", 14 to 16 Mar. 1978, Contributions to the Field of Hydraulics, vol. 2, pp. 5 & 18.
Sherry/Vickers, "European Production Release", 15 & 29 Jan. 1981, pp. 1-5 of 19.
Sperry/Vickers, 4/12 Directional Control, 6 pages, date unknown.

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