Drive circuit for an injector arrangement and a diagnostic method
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United States of America Patent
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Jan 5, 2010
Grant Date -
Oct 4, 2007
app pub date -
Apr 3, 2007
filing date -
Apr 3, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to a drive circuit for an injector arrangement having a fuel injector, and a method of detecting faults in the drive circuit. The drive circuit includes a diagnostic tool that senses a measured voltage between the injector and a known voltage level. The measured voltage is biased with respect to the known voltage to a predicted voltage unless the drive circuit has a fault. A fault signal is provided on sensing of a measured voltage that differs from the predicted voltage. The drive circuit may additionally, or alternatively, include a diagnostic tool. The diagnostic tool senses a detected current to provide a fault signal upon detection of the fault when the detected current is at variance from a threshold current.
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