Spark plug degradation detection
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United States of America Patent
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Jun 30, 2015
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app pub date -
Jan 6, 2015
filing date -
Feb 16, 2011
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Abstract
Methods and systems are provided for identifying and indicating degradation of an engine cylinder spark plug. In response to a cylinder misfire event during selected engine operating conditions, followed by an occurrence of a threshold number and/or rate of pre-ignition events in the same cylinder, a controller may determine that the spark plug is degraded. The controller may limit combustion in the cylinder in response to the degradation. Additionally, cylinder pre-ignition mitigating steps may be taken.
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