Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage
Patent
1982-03-01
1984-06-26
Look, Edward K.
Pumps
Condition responsive control of drive transmission or pump...
Adjustable cam or linkage
60389, 13762565, 13762569, F04B 126
Patent
active
044564341
ABSTRACT:
A variable displacement pump control system comprising a variable displacement pump having a movable element for controlling pump displacement, a hydraulic motor for moving the movable element, and a transducer for producing an electric signal corresponding to the actual position of the movable element. A comparator compares the electrical signal from the transducer and an electrical signal corresponding to the desired displacement of the pump and produces an error signal. A control operates in response to the error signal to meter fluid flow from the pump output to the hydraulic motor. The control comprises a relief valve, a compensator valve and a servo valve. The servo valve is preferably a single-stage valve that includes damping orifices to provide stability.
REFERENCES:
patent: 2916019 (1959-12-01), Murphy
patent: 3307824 (1967-03-01), Weisheit
patent: 3758235 (1973-09-01), Breeden
patent: 3784327 (1974-01-01), Lonnemo
patent: 3788775 (1974-01-01), Leutner et al.
patent: 3875849 (1975-04-01), Patel
patent: 4103489 (1978-08-01), Fletcher et al.
patent: 4238112 (1980-12-01), Derozier
patent: 4310143 (1982-01-01), Determan
Look Edward K.
Vickers Incorporated
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