Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1989-01-26
1990-11-06
Look, Edward K.
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60426, 60431, 60433, 60449, 60452, 91446, 91518, 91529, F15B 1116, E02F 920, E02F 922, F02D 2904
Patent
active
049675575
ABSTRACT:
Control system for a load-sensing hydraulic drive circuit comprising; at least one hydraulic pump; hydraulic actuators driven by the hydraulic pump; and a pressure compensated flow control valve between the pump and each of the actuators, for controlling a flow rate of fluid to each actuator in response to a control signal. The control system has first detection means for detecting a differential pressure between the pump delivery pressure and the maximum load pressure; second detection means for detecting the pump delivery pressure; first means for calculating a differential pressure target pump delivery amount Q.DELTA.p to hold the differential pressure constant; second means for calculating an input limiting target pump delivery amount QT based on at least a pressure signal from the second detection means and an input limiting pump function; third means for selecting one of the differential pressure target delivery amount Q.DELTA.p and the input limiting target delivery amount QT as a pump delivery amount target value Qo, and then controlling the pump delivery amount to not exceed the input amount QT; and fourth means for calculating a compensation value Qns to limit a total consumable actuator flow rate based on at least the input amount QT and the differential pressure target delivery amount Q.DELTA.p when the input amount QT is selected by the third means, and then controlling the pressure compensated flow control valve based on the compensation valve Qns.
REFERENCES:
patent: 4395199 (1983-07-01), Izumi et al.
patent: 4617854 (1986-10-01), Kropp
patent: 4747335 (1988-05-01), Budzich
patent: 4809504 (1989-03-01), Izumi et al.
Hirata Toichi
Izumi Eiki
Tanaka Yasuo
Watanabe Hiroshi
Yoshida Kuniaki
Hitachi Construction Machinery Co. Ltd.
Kapsalas George
Look Edward K.
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