Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1996-12-10
1998-10-27
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Fuel injection system
123381, 123467, F02M 700
Patent
active
058265619
ABSTRACT:
An electronically-controlled heavy fuel oil 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 are isolated from the high viscosity, heavy fuel oil. 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 check 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 less fuel injection pressure drop at the end of injection, resulting in improved engine performance and reduced emissions, noise, and wear.
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Mack David C.
Moncelle Michael E.
Caterpillar Inc.
Keen Joseph W.
McNeil Michael B.
Moulis Thomas N.
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