Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1996-08-30
1997-09-23
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Fuel injection system
123467, 239 96, F02M 3704, F02M 4702
Patent
active
056693559
ABSTRACT:
A hydraulically actuated fuel injector includes an injector body having at least one actuation fluid inlet, a needle control chamber, a nozzle chamber, and a nozzle outlet that opens to the nozzle chamber. A hydraulic means within the injector pressurizes fuel in the nozzle chamber. The hydraulic means includes an actuation fluid control valve having a first solenoid and is moveable between an open position in which the actuation fluid inlet is open and a closed position in which the actuation fluid inlet is closed. A needle valve member is positioned to reciprocate in the nozzle chamber between an open position in which the nozzle outlet is open and a closed position in which the nozzle outlet is closed. A needle valve member includes a closing hydraulic surface exposed to pressure in the needle control chamber. A needle control valve having a second solenoid is mounted within the injector body and is moveable between an off position in which the needle control chamber is opened to a source of high pressure fluid and an on position in which the needle control chamber is opened to a low pressure passage.
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Gibson Dennis H.
Hefler Gregory W.
Caterpillar Inc.
Moulis Thomas N.
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