Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2010-11-17
2011-12-13
Cronin, Stephen K (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C239S102200
Reexamination Certificate
active
08074626
ABSTRACT:
A charge control unit controls electricity charged to a piezo element, which is for actuating a backpressure control valve so as to control backpressure applied to a valve element for a fuel injection valve. The backpressure control valve is configured to start to decrease the backpressure to actuate the valve element to open an injection port of the fuel injection valve when voltage of the electricity exceeds a threshold. A charge unit increases the voltage by repeating increasing and decreasing a drive current, which is supplied to the piezo element, for multiple times for charging the piezo element. A switching unit alternates the increasing and the decreasing such that the voltage exceeds the threshold in an intermediate period in a middle of a specific increasing period among multiple increasing periods, in each of which the drive current increases.
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Japanese Office Action dated Jun. 26, 2009, issued in corresponding Japanese Application No. 2007-207373 with an at least partial English-language translation.
Cronin Stephen K
Denso Corporation
Nixon & Vanderhye P.C.
Vilakazi Sizo
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