Skip to Content
Find More Like This
Return to Search

Combustion driven ammonia generation strategies for passive ammonia SCR system

United States Patent

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)
13/ 652,549
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.