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System and method for determining an ammonia generation rate in a three-way catalyst

United States Patent

December 30, 2014
View the Complete Patent at the US Patent & Trademark Office
A system according to the principles of the present disclosure includes a rate determination module, a storage level determination module, and an air/fuel ratio control module. The rate determination module determines an ammonia generation rate in a three-way catalyst based on a reaction efficiency and a reactant level. The storage level determination module determines an ammonia storage level in a selective catalytic reduction (SCR) catalyst positioned downstream from the three-way catalyst based on the ammonia generation rate. The air/fuel ratio control module controls an air/fuel ratio of an engine based on the ammonia storage level.
Sun; Min (Troy, MI), Perry; Kevin L. (Fraser, MI), Kim; Chang H. (Rochester, MI)
GM Global Technology Operations LLC (N/A)
13/ 157,669
June 10, 2011
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.