Power plants – Pressure fluid source and motor – Condition responsive control of or by input to input pump...
Patent
1975-08-15
1976-10-26
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Condition responsive control of or by input to input pump...
60459, 417 34, F15B 1518, F16D 3100
Patent
active
039876250
ABSTRACT:
The combined sensor and control comprises a flow sensor through which passes working hydraulic fluid delivered by a pump through a hydraulic power circuit to a hydraulically operated power mechanism which is subjected to variations in load. The sensor senses incipient changes in a preselected rate of flow of the working hydraulic fluid by detection of very slight changes in the differentials in the pressure of the working fluid at opposite sides of a restricting orifice through which the working fluid is constrained to pass. These differentials in pressure, or pressure drops, operate a pneumatic pressure control device by which pneumatic pressure supplied to an actuator through a circuit, isolated from the working hydraulic circuit, is controlled. The pressure control device causes the applied pneumatic pressure to be varied almost instantly in a manner analogous to the slight variations in the normal preselected differential in pressure across the orifice. The actuator, in turn, is drivingly connected to the throttle of an internal combustion engine which drives the pump, and is operated by the applied pneumatic pressure to move the throttle to increase the fuel intake of the engine as the flow of the hydraulic fluid through the sensor decreases slightly, and to decrease the fuel intake as the flow of hydraulic fluid through the sensor increases slightly. The control device is exceedingly sensitive so as to operate upon incipient changes in the rate of flow and maintain a substantially constant preselected rate of flow of working hydraulic fluid to the power mechanism under fluctuations in the applied load.
REFERENCES:
patent: 2690712 (1954-10-01), Foote
patent: 2942421 (1960-06-01), Hann et al.
patent: 3159965 (1964-12-01), Woolley et al.
patent: 3459131 (1969-08-01), Senf
Lyth William Wilson
Swatty Eugene E.
Fluid Controls Inc.
Geoghegan Edgar W.
Leonard John Harrow
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