Compression sense ignition system with fault mode detection and having improved capacitive sensing
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United States of America Patent
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Mar 19, 2002
Grant Date -
N/A
app pub date -
Mar 13, 2000
filing date -
Mar 13, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A compression sense ignition system includes a sensing capacitor having a conductive sensing element disposed in proximity to the secondary winding leads of a first and a second ignition coil for developing a compression sense ignition signal. Epoxy potting material encapsulates the leads and the sensing element to reduce variation of the effective capacitance of the sensing capacitor. The compression sense ignition signal is processed to generate a cylinder identification signal which is used to determine absolute engine position. A fault mode detection and correction scheme is implemented wherein a controller responsive to the cylinder identification signal can determine correct absolute engine position notwithstanding the occurrence of one or more engine or ignition system faults which may impair the cylinder identification signal.
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