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Combustion driven ammonia generation strategies for passive ammonia SCR system

United States Patent

9,512,793
December 6, 2016
View the Complete Patent at the US Patent & Trademark Office
A method for controlling ammonia generation in an exhaust gas feedstream output from an internal combustion engine equipped with an exhaust aftertreatment system including a first aftertreatment device includes executing an ammonia generation cycle to generate ammonia on the first aftertreatment device. A desired air-fuel ratio output from the engine and entering the exhaust aftertreatment system conducive for generating ammonia on the first aftertreatment device is determined. Operation of a selected combination of a plurality of cylinders of the engine is selectively altered to achieve the desired air-fuel ratio entering the exhaust aftertreatment system.
Toner; Joel G. (Bad Axe, MI), Narayanaswamy; Kushal (Troy, MI), Szekely, Jr.; Gerald A. (Sterling Heights, MI), Najt; Paul M. (Bloomfield Hills, MI)
GM GLOBAL TECHNOLOGY OPERATIONS LLC (Detroit, MI)
13/ 652,549
20140102081
October 16, 2012
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.