Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1997-05-28
1998-04-14
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Fuel injection system
123496, F02M 700, F02M 3704
Patent
active
057380759
ABSTRACT:
A hydraulically actuated fuel injector includes an injector body having an actuation fluid inlet and a needle control chamber. A hydraulic means within the injector pressurizes fuel in the injector body. The hydraulic means includes an actuation fluid control valve having a solenoid and is movable to open and close the actuation fluid inlet. A needle valve member includes a closing hydraulic surface exposed to pressure in the needle control chamber. A needle control valve, which utilizes the same solenoid, is mounted in the injector body and movable to open and close the needle control chamber to a source of high pressure fluid. The slower response time of the actuation fluid control valve allows for direct control of the fast responding needle valve by a single fast acting solenoid.
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Chen Shikui K.
Hefler Gregory W.
Caterpillar Inc.
Moulis Thomas N.
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