Patent ID: 6712043
Filing Date: 2004-03-30
Classification: F02D,F02M,F04B

Abstract:
A control system for controlling the flow of an actuating fluid to an accumulator, the accumulator serving the fuel injectors of an internal combustion engine, comprising:a controller being in communication with a plurality of engine related sensors; a multi-stage pump being in fluid communication with a source of actuating fluid; a valve being in selective fluid communication with the accumulator, with a low pressure reservoir, and with at least one stage of the multi-stage pump, the valve further being in communication with the controller, the controller acting to shift the valve to selectively port actuating fluid to the accumulator and to vent actuating fluid to the reservoir, the valve being a proportional flow control valve in fluid communication with the multi-stage pump and with the low pressure reservoir for smoothly controlling pressure during transition between porting actuating fluid to the accumulator and venting actuating fluid to the reservoir.