Internal-combustion engines – Charge forming device – With fuel pump
Reexamination Certificate
2005-12-27
2005-12-27
Moulis, Thomas (Department: 3747)
Internal-combustion engines
Charge forming device
With fuel pump
C123S496000
Reexamination Certificate
active
06978770
ABSTRACT:
A piezoelectric fuel injection system and a method of controlling same are provided which include 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 charge the piezoelectric element to an initial voltage to begin said injection event, to decrease the voltage from the initial voltage to an intermediate voltage, and to increase the voltage from the intermediate voltage to a primary voltage to thereby control the injection rate shape. The initial voltage level is at least approximately equal to said primary voltage level and preferably approximately equal to a maximum voltage rating. The initial voltage duration, the intermediate voltage duration and the magnitude of the intermediate voltage can be changed or varied to modify the injection or rate shape.
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Crofts John D.
Meyer William D.
Peters Lester L.
Rauznitz Peter
Brackett, Jr. Tim L.
Cummins Inc.
Moulis Thomas
Nixon & Peabody LLP
Schelkopf J. Bruce
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