Detection of faults in an injector arrangement
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United States of America Patent
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Aug 21, 2012
Grant Date -
May 14, 2009
app pub date -
Oct 10, 2008
filing date -
Oct 11, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A fault detection method is provided for detecting faults in an injector arrangement. The injector arrangement includes one or more piezoelectric fuel injectors connected in an injector drive circuit, and the injector drive circuit is arranged to control operation of the one or more piezoelectric fuel injectors. The fault detection method includes determining a sample voltage at a sample point in the injector drive circuit at a first sample time. The sample voltage is the voltage on an injector or is related to the voltage on an injector. The method further includes calculating a range of predicted voltages expected at the sample point at a second sample time following the first sample time, and determining the sample voltage at the sample point at the second sample time. The presence of a fault is detected if the sample voltage determined at the sample point at the second sample time is not within the range of predicted voltages.
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