Detection of faults in an injector arrangement
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United States of America Patent
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Oct 26, 2010
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N/A
app pub date -
Nov 28, 2007
filing date -
Nov 30, 2006
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Abstract
A method of detecting faults in an injector arrangement in an engine. The injector arrangement comprises at least one fuel injector having a piezoelectric actuator, and the method comprises: charging the piezoelectric actuator during a charge phase (t.sub.C); attempting to recharge the piezoelectric actuator during a test phase (t.sub.T) which commences after a time interval (.DELTA.t) following the end of the charge phase (t.sub.C); sensing a current (I.sub.S) that flows through the piezoelectric actuator during the test phase (t.sub.T); and generating a short circuit fault signal if the sensed current (I.sub.S) reaches a first predetermined threshold current (I.sub.SC) which is indicative of a short circuit in the piezoelectric actuator.
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