Fault detector and method of detecting faults
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United States of America Patent
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Mar 29, 2011
Grant Date -
May 21, 2009
app pub date -
Nov 12, 2008
filing date -
Nov 15, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A fault detector for detecting valve movement of a valve in a fuel injector of an engine system, the valve includes an electromagnetic actuator arranged to move the valve between first and second valve positions, the engine system includes a sensor for sensing a current through the actuator. The detector includes a controller arranged to control the sensor; receive sensor data related to the current through the actuator; analyze the received data for current discontinuities; and output a valve movement signal dependent upon the current discontinuities. The controller is arranged to sense current during a finite sampling window, move the sampling window from a first window position to a later window position for one or more subsequent injection events; determine a new sampling window position on based a valve movement signal output the two preceding windows; and feedback the new sampling window position for a subsequent injection event.
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