Hydraulic control system

Details Hydraulic control system Hydraulic control system

2005-12-27

2005-12-27

Look, Edward K. (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

C060S422000

Reexamination Certificate

active

06978607

ABSTRACT:
A hydraulic control system is presented that includes a hydraulic actuator, an operation command unit that provides a first control operation signal, a directional control valve unit with a directional control valve that supplies pressure oil to the hydraulic actuator based on the first control operation signal, a variable displacement hydraulic pump having a discharge rate that changes in response to the first control operation signal, a differential pressure generating unit that generates a differential pressure between pressure of the hydraulic pump and oil pressure and outputs a second control operation signal indicative of the differential pressure. The hydraulic control system further includes a control quantity correcting unit that corrects the first control operation signal based on the second control operation signal, and a discharge rate control unit that controls the discharge rate of the variable displacement hydraulic pump based on the corrected first control operation signal.

REFERENCES:
patent: 5579642 (1996-12-01), Wilke et al.
patent: 5699665 (1997-12-01), Coolidge
patent: 6158462 (2000-12-01), Kashiwagi et al.
patent: 2001-187901 (2001-07-01), None

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