Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage
Patent
1979-06-12
1981-08-25
Christian, Leonard D.
Pumps
Condition responsive control of drive transmission or pump...
Adjustable cam or linkage
417280, B64C 1104, B63H 500
Patent
active
042856396
ABSTRACT:
An electronic control system for pressure and flow control of variable displacement pumps consists of a closed loop system of operational amplifiers which provide continuous control of the volume modifying element in the pump. In a variable displacement vane pump application a command flow control signal and a feedback signal representative of the position of the adjustable cam ring in the pump are applied to an integrating amplifier to develop a signal for application to an electro-hydraulic valve in the pressure compensating portion of the pump. A command pressure signal is compared with the control signal to limit the latter to a level, thereby providing pressure control for the pump. Slip compensation is effected in the control system by utilizing a portion of the control signal to provide proportional modification of the command signal.
REFERENCES:
patent: 3269319 (1966-08-01), Dargas
patent: 3625637 (1971-12-01), Kiwalle et al.
patent: 3777492 (1973-12-01), Boydell et al.
Houtman Paul K.
Kowalski Thomas A.
Whitmore Charles H.
Woodring Richard H.
Balazs Joseph B.
Christian Leonard D.
Parker-Hannifin Corporation
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