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TECHNIQUE TO DIAGNOSE AND CONTROL AMMONIA GENERATION FROM A TWC FOR PASSIVE AMMONIA SCR OPERATION

United States Patent Application

20130340408
A1
View the Complete Application 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 having a first aftertreatment device includes executing an ammonia generation cycle to generate ammonia on the first aftertreatment device. The ammonia generation cycle includes monitoring an air-fuel ratio in the exhaust gas feedstream at a first location in the exhaust aftertreatment system, and monitoring an air-fuel ratio in the exhaust gas feedstream at a second location in the exhaust aftertreatment system. The air-fuel ratio at the first location is compared to the air-fuel ratio at the second location. If the air-fuel ratio at the second location is richer than the air-fuel ratio at the first location, operation of the engine is adjusted until the air-fuel ratio at the second location is equal to the air-fuel ratio at the first location.
Narayanaswamy, Kushal (Troy, MI), Toner, Joel G. (Bad Axe, MI), Najt, Paul M. (Bloomfield Hills, MI), Szekely, JR., Gerald A. (Sterling Heights, MI)
GM GLOBAL TECHNOLOGY OPERATIONS LLC (DETROIT MI)
13/ 533,069
June 26, 2012
GOVERNMENT CONTRACT RIGHTS [0001] 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.