Method and device for the calibration a piezo-actuator that is actuated in a motor vehicle for driving a switching valve
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United States of America Patent
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Aug 18, 2015
Grant Date -
Oct 21, 2010
app pub date -
Nov 14, 2008
filing date -
Nov 14, 2007
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Abstract
In a method for calibration, a piezo-actuator (1) is actuated in a motor vehicle by a control circuit and an output stage. The piezo actuator is, in particular, part of the injection valve. The piezo-actuator (1) is subjected to an electric calibration pulse that is in the high-level signal range thereof when the control circuit and the output stage are in operation, the frequency thereof being modified over time. The associated electric impendence curve over the frequency is determined and evaluated during the calibration pulse. The output stage is controlled by the control circuit in such a manner that the calibration pulse is generated.
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