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Method for operating a spark-ignition, direct-injection internal combustion engine

United States Patent

June 2, 2015
View the Complete Patent at the US Patent & Trademark Office
A spark-ignition, direct-injection internal combustion engine is coupled to an exhaust aftertreatment system including a three-way catalytic converter upstream of an NH3-SCR catalyst. A method for operating the engine includes operating the engine in a fuel cutoff mode and coincidentally executing a second fuel injection control scheme upon detecting an engine load that permits operation in the fuel cutoff mode.
Narayanaswamy; Kushal (Sterling Heights, MI), Koch; Calvin K. (Bloomfield Hills, MI), Najt; Paul M. (Bloomfield Hills, MI), Szekely, Jr.; Gerald A. (Sterling Heights, MI), Toner; Joel G. (Bad Axe, MI)
13/ 156,655
June 9, 2011
GOVERNMENT CONTRACT RIGHTS This invention was made with U.S. Government support under Agreement No. DE-EE0003379 awarded by the U.S. Department of Energy. The U.S. Government may have certain rights in this invention.