Spark plug fouling detection for ignition system
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United States of America Patent
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Oct 3, 2017
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N/A
app pub date -
Nov 6, 2014
filing date -
Dec 19, 2013
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Abstract
Methods and systems are provided for determining a type of spark plug fouling. In one example, a method may include differentiating spark plug fouling due to soot accumulation from spark plug fouling due to fuel additive accumulation based on a current on a control wire of the spark plug following application of a dwell command. Further, exhaust oxygen sensor degradation and/or exhaust catalyst degradation may be determined based on switching frequencies of one or more exhaust oxygen sensors and the type of spark plug fouling.
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