Method for operating a direct-injection spark-assisted compression-ignition engine
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United States of America Patent
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May 7, 2013
Grant Date -
Jul 28, 2011
app pub date -
Jan 27, 2010
filing date -
Jan 27, 2010
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Abstract
A compression-ignition internal combustion engine includes a plurality of combustion chambers operating in a four-stroke combustion cycle and is configured to operate at a geometric compression ratio greater than 10:1. A method for operating a the engine includes forming a fuel/air charge by injecting fuel into each combustion chamber during a compression stroke, wherein the injection is completed prior to any combustion within the combustion chamber. The method further includes operating the engine to manage temperature of the fuel/air charge in the combustion chamber below an auto-ignition point of the fuel/air charge, and providing a spark discharge in the combustion chamber subsequent to injecting the fuel and in advance of the fuel/air charge achieving an auto-ignition temperature.
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