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SYSTEM AND METHOD FOR CONTROLLING AMMONIA LEVELS IN A SELECTIVE CATALYTIC REDUCTION CATALYST USING A NITROGEN OXIDE SENSOR

United States Patent Application

*** PATENT GRANTED ***
20130025261
9,714,625
A1
View the Complete Application at the US Patent & Trademark Office
A system according to the principles of the present disclosure includes an air/fuel ratio determination module and an emission level determination module. The air/fuel ratio determination module determines an air/fuel ratio based on input from an air/fuel ratio sensor positioned downstream from a three-way catalyst that is positioned upstream from a selective catalytic reduction (SCR) catalyst. The emission level determination module selects one of a predetermined value and an input based on the air/fuel ratio. The input is received from a nitrogen oxide sensor positioned downstream from the three-way catalyst. The emission level determination module determines an ammonia level based on the one of the predetermined value and the input received from the nitrogen oxide sensor.
Sun, Min (Troy, MI), Perry, Kevin L. (Fraser, MI), Dibble, Donovan L. (Utica, MI), Kim, Chang H. (Rochester, MI), Furness, Mary Beth (Ann Arbor, MI)
GM Global Technology Operations LLC (Detroit MI)
13/ 192,859
July 28, 2011
STATEMENT OF GOVERNMENT RIGHTS [0001] 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.