Control system and method to control variable hydraulic pumps wi

Details Control system and method to control variable hydraulic pumps wi Control system and method to control variable hydraulic pumps wi

1997-05-29

1999-08-24

Freay, Charles G.

Pumps

Condition responsive control of pump drive motor

Responsive to pump or pump fluid temperature

417 53, F04B 4910

Patent

active

059416890

ABSTRACT:
A control system for a variable pump and a process to control the variable pump with a circuit connected to a hydraulic motor by working lines, controlled by an electronic controller, having check valves in the circuit to allow oil flow from a charge pump going into the circuit and further consisting of high pressure relief valves to allow oil flow out of the working lines to limit maximum pressure. A temperature sensor is placed between the high pressure relief valves and the connected check valves. A signal is processed in an electronic control to control the displacement of a variable pump, depending on temperature measure of the fluid flowing across the high pressure relief valves.

REFERENCES:
patent: 3236049 (1966-02-01), Reinke
patent: 4368798 (1983-01-01), Meyerle et al.
patent: 4802336 (1989-02-01), Mayr et al.
patent: 5285642 (1994-02-01), Watanabe et al.
patent: 5352095 (1994-10-01), Tanaka et al.
patent: 5758499 (1998-06-01), Sugiyama et al.

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