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System and method for controlling an engine based on ammonia storage in multiple selective catalytic reduction catalysts

United States Patent

November 17, 2015
View the Complete Patent at the US Patent & Trademark Office
A system according to the principles of the present disclosure includes a storage estimation module and an air/fuel ratio control module. The storage estimation module estimates a first amount of ammonia stored in a first selective catalytic reduction (SCR) catalyst and estimates a second amount of ammonia stored in a second SCR catalyst. The air/fuel ratio control module controls an air/fuel ratio of an engine based on the first amount, the second amount, and a temperature of a substrate disposed in the second SCR catalyst.
Sun; Min (Troy, MI), Perry; Kevin L. (Fraser, MI)
GM Global Technology Operations LLC (Detroit, MI)
13/ 471,861
May 15, 2012
STATEMENT OF GOVERNMENT RIGHTS This invention was produced pursuant to United States Government Program No. DE-EE0003379 with the Department of Energy (DoE). The U.S. Government has certain rights in this invention.