Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2007-05-22
2008-09-09
Vo, Hieu T (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
Reexamination Certificate
active
07422005
ABSTRACT:
A method of operating a fuel injector including a piezoelectric actuator having a stack of piezoelectric elements, comprises applying a discharge current (IDISCHARGE) to the actuator for a discharge period so to discharge the stack from a first differential voltage level across the stack to a second, lower differential voltage level across the stack so as to initiate an injection event, and applying a charge current (ICHARGE) to the actuator for a charge period (T3to T4′) so as to charge the stack from the second differential voltage level to a third differential voltage level so as to terminate the injection event. The method includes determining at least one engine parameter (e.g. common rail pressure) of the injection event prior to applying the charge current (ICHARGE) to the actuator and selecting the third differential voltage level in dependence on the at least one engine parameter.
REFERENCES:
patent: 7305971 (2007-12-01), Fujii
patent: 2003/0150429 (2003-08-01), Rueger
patent: 103 11 269 (2004-09-01), None
patent: 10 2004 058971 (2006-06-01), None
patent: 2005/071248 (2005-08-01), None
patent: WO 2007/082627 (2007-07-01), None
European Search Report dated Jun. 4, 2007.
Berlemont Jean-Francois
Cooke Michael P
Goat Christopher A
Hardy Martin P
Hargreaves Andrew John
Delphi Technologies Inc.
Vo Hieu T
Wood David P.
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