Control system and method for preventing stochastic pre-ignition in an engine
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United States of America Patent
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Sep 8, 2015
Grant Date -
Feb 28, 2013
app pub date -
Aug 23, 2011
filing date -
Aug 23, 2011
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Abstract
A control system for an engine includes a spark module and a fuel module. The spark module advances spark timing of a cylinder R degrees past a spark limit for N consecutive cylinder firing events, and retards spark timing of the cylinder past the spark limit for M consecutive cylinder firing events after the N consecutive cylinder firing events. The fuel module supplies a rich fuel-air charge to the cylinder for the M consecutive cylinder firing events. According to the system, R is a real number greater than zero, N and M are integers greater than zero, and the spark limit is a control value used to limit an amount of spark advance to prevent spark-knock. A method for controlling an engine is also provided.
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