Electrohydraulic pump load control system

Details Electrohydraulic pump load control system Electrohydraulic pump load control system

1992-11-23

1993-10-19

Bertsch, Richard A.

Pumps

Condition responsive control of pump drive motor

Responsive to accumulation of pumped liquid in receiver

417371, F04B 4900

Patent

active

052539822

ABSTRACT:
An electrohydraulic pump load control system that includes a fluid-cooled integrated electric motor/hydraulic pump for delivering fluid under pressure to an accumulator that stabilizes pump output pressure while accommodating changes in fluid flow. A pressure sensor is coupled to the accumulator to provide an electrical signal as a function of fluid pressure at the accumulator. An electronic controller applies electrical power to the pump motor, and is responsive to the electrical signal from the pressure sensor for terminating application of electrical power to the pump motor when pressure at the accumulator reaches the desired threshold. The electronic motor controller controls both application and termination of electrical power to the motor to energize and de-energize the motor at predetermined rates responsive to pressure differential thresholds at the pressure sensor.

REFERENCES:
patent: 2763214 (1956-08-01), White
patent: 3563671 (1971-02-01), Weber
patent: 5064347 (1991-11-01), La Valley, Sr.
Vickers Industrial Hydraulics Manual, Vickers, Incorporated, 1989 pp. 19-5 through 19-7.

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