Control circuit for variable displacement pump with venturi bypa

Details Control circuit for variable displacement pump with venturi bypa Control circuit for variable displacement pump with venturi bypa

1978-09-25

1980-01-08

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Condition responsive control of or by input to input pump...

60445, 60456, 60464, 60468, F16D 3102, F15B 2104

Patent

active

041821254

ABSTRACT:
A control circuit (10) for the variable displacement pump (18) of a hydrostatic transmission (16) or the like comprises an underspeed actuator (31) connected to the servo system (19) of the pump (18), a venturi (15) interconnected between a source of pressurized working fluid (11) and the pump (18) and a pressure regulating valve (36) interconnected between a downstream side of the venturi (15) and the pump (18). A throat (29) and upstream side of the venturi (15) are connected to the underspeed actuator (31) for communicating a differential fluid pressure signal thereto to automatically control the displacement of the pump (18) under certain operating conditions of an engine of a vehicle. This invention is directed to a bypass arrangement (39) interconnected between a downstream side of the pressure regulating valve (36) and the upstream side of the venturi (15) to closely control the fluid pressure drop across the venturi (15) and to compensate for changes in the temperature of the pressurized working fluid passing through the venturi (15).

REFERENCES:
patent: 3727628 (1973-04-01), Habiger et al.
patent: 3996743 (1976-12-01), Habiger et al.
patent: 4094145 (1978-06-01), Habiger

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