Fluid pressure source apparatus for providing adequate accumulat

Details Fluid pressure source apparatus for providing adequate accumulat Fluid pressure source apparatus for providing adequate accumulat

1997-11-20

1999-08-10

Thorpe, Timothy S.

Pumps

Condition responsive control of pump drive motor

Responsive to accumulation of pumped liquid in receiver

303122, 303 10, 30312205, F04B 4902

Patent

active

059348801

ABSTRACT:
A fluid pressure source apparatus has a pump, an accumulator, a pressure switch, and a control device for turning on and off the pump in accordance with the signal from the pressure switch. The control device has a pressure increase control unit. When the pressure detection signal of the pressure switch indicates a high pressure, the pressure increase control unit estimates a pressure reduction N resulting from a fluid pressure consumption by a fluid pressure circuit. If the estimated amount of pressure reduction N exceeds a set value KN=KN1, KN2, the pressure increase control unit drives the pump for a set time KT=KT1, KT2, thereby ensuring a predetermined range of accumulator pressure despite a possible failure of the pressure switch or sensor.

REFERENCES:
patent: 4880282 (1989-11-01), Makino et al.
patent: 5221125 (1993-06-01), Okochi et al.
patent: 5413404 (1995-05-01), Inagawa

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