Method for determining the activation voltage of a piezoelectric actuator of an injector
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United States of America Patent
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Nov 25, 2008
Grant Date -
Aug 9, 2007
app pub date -
Jul 10, 2004
filing date -
Sep 1, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for determining the activation voltage of a piezoelectric actuator of at least one injector which is used to inject a liquid volume under high pressure into a cavity, in particular into a combustion chamber of an internal combustion engine, the activation voltage being varied as a function of the pressure used to pressurize the liquid volume. A drift of the activation voltage (voltage requirement) required for a predefined lift of a control valve of the injector is controlled on an injector-specific basis by controlling the difference between the cutoff-voltage threshold and the final steady-state voltage to a setpoint value predefined for one operating point.
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