Pressure override control

Details Pressure override control Pressure override control

1979-08-14

1984-10-16

Cohen, Irwin C.

Power plants

Pressure fluid source and motor

Servo-motor having externally operated control valve sets...

60443, 60452, 417213, F04B 4908, F16H 3946

Patent

active

044766807

ABSTRACT:
A pressure override control which utilizes pump output flow for destroking of a variable displacement pump to minimize loss of power and generation of heat and which includes modifications to the displacement control valve for the pump and, particularly, the cross connection of displacement-controlling servo motors when the displacement control valve is in a neutral position with blocking of communication of said servo motors to a displacement control pressure and drain whereby the pump cannot be positioned in a maximum displacement position in response to certain system malfunctions in the power override control circuitry.

REFERENCES:
patent: 1974138 (1934-09-01), Ferris et al.
patent: 3659963 (1972-05-01), Jennings
patent: 3908519 (1975-09-01), Born et al.
patent: 3986358 (1976-10-01), Hoffman
patent: 4055047 (1977-10-01), Hara
patent: 4076459 (1978-02-01), Adams et al.
patent: 4116002 (1978-09-01), Knapp et al.
patent: 4149380 (1979-04-01), Nonnenmacher
Eaton Brochure "Override Control", Form EH 1078, Apr. 21, 1975.
Eaton Brochure "Pressure Compensator Control", Form EH 1083, Jan. 6, 1976.
Hydraulic, Inc. Publication "Rapid Response Torque Control", Jan. 28, 1977.
Norris, A., "Pressure Compensator Override", Publication of National Conference on Fluid Power, 1975.
Sauer Getriebe, "Pressure Compensator Control".

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