Patent ID: 6439199
Filing Date: 2002-08-27
Classification: F02M,F04B

Abstract:
In an internal combustion engine having a hydraulically-actuated electronically-controlled fuel injection system of the type including a fuel injector valving high pressure fluid in response to commands from an ECM to timely inject a metered quantity of fuel into the engine's combustion chamber; the injector in fluid communication with the outlet of a high pressure pump in turn having an inlet in fluid communication with a low pressure pump; the improvement comprising:said high pressure pump being of a type in which the flow of high pressure fluid from the outlet thereof can be varied in response to a variation of flow at the inlet of said high pressure pump, and a throttling valve having an inlet in fluid communication with said low pressure pump and an outlet in fluid communication with said high pressure pump, said throttling valve having a flow control slave valve providing a variably set flow from said throttling valve inlet to said throttling valve outlet and a pilot operated, mechanical actuator controlling said variably set flow of said slave valve.