Internal-combustion engines – Charge forming device – With fuel pump
Reexamination Certificate
2008-09-11
2011-11-08
Wolfe, Jr., Willis (Department: 3747)
Internal-combustion engines
Charge forming device
With fuel pump
C123S478000, C123S480000, C123S494000, C701S103000, C239S102200
Reexamination Certificate
active
08051839
ABSTRACT:
A method of operating a fuel injector including a piezoelectric actuator having a stack of piezoelectric elements, and wherein in use the injector communicates with a fuel rail, the method comprises: applying a discharge current to the actuator for a discharge period so as to discharge the stack from a first differential voltage level across the stack to a second differential voltage level across the stack; maintaining the second differential voltage level for a period of time; and applying a charge current to the actuator for a charge period so as to charge the stack from the second differential voltage level to a third differential voltage level; wherein the third differential voltage level is selected in dependence on at least two engine parameters, the at least two engine parameters selected from: rail pressure; the electric pulse time; and the piezoelectric stack temperature.
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European Search Report dated Apr. 25, 2008.
Hopley Daniel Jeremy
Spadafora Peter J.
Tolliday Adrian R.
Bacon Anthony L
Delphi Technologies Holdings S.arl
Twomey Thomas N.
Wolfe, Jr. Willis
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