Method and apparatus for injecting fuel using control fluid to c

Details Method and apparatus for injecting fuel using control fluid to c Method and apparatus for injecting fuel using control fluid to c

1996-12-09

1998-01-20

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Fuel injection system

123467, 239 96, F02M 4100

Patent

active

057091943

ABSTRACT:
An improved electronically-controlled heavy fuel oil (HFO) injection system comprises a pumping chamber for pressurizing fuel and a direct-operated check for controlling fuel injection. A control fluid different from the fuel is used to operate regulating apparatus for controlling the fuel injection pressure and fuel injection timing. The regulating apparatus isolate the HFO from sensitive mechanisms by appropriate exposure of the control fluid to flush intruding HFO from those mechanisms. Pressurization of fuel begins before the start of fuel injection. Fuel injection is initiated by exposing one end of the check to low pressure control fluid while the other end is exposed to high pressure fuel. Fuel injection is terminated by exposing the one end to high pressure control fluid to hydraulically balance the check and allow a biasing device to close the check.
The present invention provides improved control of several fuel injection parameters, including higher peak fuel injection capability and faster fuel injection pressure drop at the end of injection, resulting in improved engine performance and reduced emissions, noise, and wear.

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