Method and system for closed loop combustion control of a lean-burn reciprocating engine using ionization detection
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United States of America Patent
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Sep 21, 2010
Grant Date -
Mar 26, 2009
app pub date -
Nov 25, 2008
filing date -
Sep 28, 2006
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Abstract
A system and method for controlling knock in a lean burn internal combustion (IC) engine includes a spark plug having an electrode, and an electrical circuit configured to provide a first voltage to the electrode and detect an ion current during a thermal-ionization phase of the combustion process, and provide a second voltage to the electrode to create a spark and initiate a combustion process within a combustion chamber. The engine includes a controller configured to monitor the ion current for a knock condition that includes at least an incipient knock condition, determine a spark crank angle timing of the IC engine where the incipient knock occurs, and adjust the spark timing of the IC engine to operate at a crank angle that does not exceed a threshold level beyond an incipient knock set point.
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