Drive circuit for an injector arrangement and a diagnostic method
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United States of America Patent
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-
Mar 3, 2009
Grant Date -
Jan 10, 2008
app pub date -
May 21, 2007
filing date -
May 23, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a drive circuit for an injector arrangement comprising a first fuel injector in parallel with a capacitive component. The drive circuit comprises: a selector means (SQ.sub.1, SQ.sub.2) and diagnostic means. The selector means (SQ.sub.1, SQ.sub.2) is operable to select the first fuel injector and/or the capacitive component into the drive circuit and to deselect the first fuel injector and/or the capacitive component from the drive circuit. When the capacitive component is selected and the first fuel injector is deselected, the diagnostic means is operable to sense a current (I.sub.sense) through the first fuel injector. When the sensed current (I.sub.sense) is at variance from a first threshold current (I.sub.limit) the diagnostic means is operable to provide a first signal on detection of a stack terminal short circuit fault associated with the first fuel injector. The capacitive component may be a second fuel injector.
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