Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2007-10-02
2007-10-02
Cronin, Stephen K. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C310S317000
Reexamination Certificate
active
11453723
ABSTRACT:
A valve has a piezoelectric actuator with a valve element, a valve body and a valve seat. In order to control the valve, the valve element is moved into the valve seat from a position remote from the valve seat by means of a charging process at a prescribable first time. A first value is determined being characteristic of the electrical power supplied to the piezoelectric actuator when the valve element meets the valve seat. A second value is determined being characteristic of the electrical power supplied to the piezoelectric actuator when the charging process of the piezoelectric actuator is concluded. An actual difference value between the second value and the first value is determined. A difference between a setpoint difference value and the actual difference value is supplied to a controller. An actuating signal for charging the piezoelectric actuator is determined as a function of the actuating variable.
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International Search Report for International Application No. PCT/EP2004/014271 (5 pages).
Office Action for German Appln. No. 103 59 675.5-26 (3 pages).
Beilharz Jörg
Kronberger Maximilian
Pirkl Richard
Ribler Christian
Schmidt Harald
Baker & Botts L.L.P.
Castro Arnold
Cronin Stephen K.
Siemens AG
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