Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2007-10-19
2011-12-27
Cronin, Stephen K (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S447000, C123S456000, C239S584000
Reexamination Certificate
active
08082902
ABSTRACT:
A common rail fuel injection system includes a piezo intensifier fuel injector that includes a plurality of components. Among these are a needle valve member, an intensifier piston, a first piezo stack electrical actuator and a second piezo stack electrical actuator. These components have a first configuration at which the needle valve member blocks a nozzle outlet of the fuel injector, and a shoulder of the intensifier piston is exposed to fluid pressure in a common rail. The components have a second configuration at which the nozzle outlet is fluidly connected to the common rail for a low pressure injection event. The components have a third configuration at which the nozzle outlet is fluidly blocked from the common rail, but movement of the intensifier displaces fluid through the nozzle outlet for a high pressure injection event.
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Gibson Dennis
Kim Hoisan
Sommars Mark
Caterpillar Inc.
Cronin Stephen K
Liell & McNeil
Najmuddin Raza
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