Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2005-07-05
2005-07-05
Kwon, John T. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S496000, C701S104000, C310S316010, C239S102200
Reexamination Certificate
active
06912998
ABSTRACT:
A piezoelectric fuel injection system and a method of controlling same, the system including a piezoelectric fuel injector having a piezoelectric element, a power source adapted to provide power to the piezoelectric element to actuate the piezoelectric fuel injector, and a controller adapted to cyclically modulate power provide to the piezoelectric element by the power source during at least a portion of the injection event. The controller cyclically modulates the power between a predetermined first voltage and a predetermined second voltage that is less than the first voltage to control the rate of fuel injected by the piezoelectric fuel injector during the portion of the injection.
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Crofts John D.
Peters Lester L.
Rauznitz Peter
Brackett, Jr. Tim L.
Cummins Inc.
Kwon John T.
Nixon & Peabody LLP
Schelkopf J. Bruce
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