Electronic control for variable displacement pumps

Details Electronic control for variable displacement pumps Electronic control for variable displacement pumps

F - Mech Eng,Light,Heat,Weapons

04

B

341/38

F04B 49/06 (2006.01)

Patent

CA 1140655

TITLE: ELECTRONIC CONTROL FOR VARIABLE DISPLACEMENT PUMPS 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 applica- tion to an electro-hydraulic valve in the pressure compensat- ing 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.

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