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Distributed ignition method and apparatus for a combustion engine

United States Patent

March 7, 2006
View the Complete Patent at the US Patent & Trademark Office
A method and apparatus for operating an internal combustion engine is provided. The method comprises the steps of introducing a primary fuel into a main combustion chamber of the engine, introducing a pilot fuel into the main combustion chamber of the engine, determining an operating load of the engine, determining a desired spark plug ignition timing based on the engine operating load, and igniting the primary fuel and pilot fuel with a spark plug at the desired spark plug ignition timing. The method is characterized in that the octane number of the pilot fuel is lower than the octane number of the primary fuel.
Willi; Martin L. (Dunlap, IL), Bailey; Brett M. (Peoria, IL), Fiveland; Scott B. (East Norwich, NY), Gong; Weidong (Dunlap, IL)
Caterpillar Inc. (Peoria, IL)
11/ 003,537
December 3, 2004
GOVERNMENT RIGHTS This invention was made with Government support under DE-FC26-01CH11079 awarded by the Department of Energy. The Government has certain rights in this invention.