The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 30, 2011
Filed:
Sep. 20, 2006
Steven J. Schmieg, Troy, MI (US);
Richard J. Blint, Shelby Township, MI (US);
Ling Deng, Sterling Heights, MI (US);
Michael B. Viola, Macomb Township, MI (US);
Jong-hwan Lee, Rochester Hills, MI (US);
Steven J. Schmieg, Troy, MI (US);
Richard J. Blint, Shelby Township, MI (US);
Ling Deng, Sterling Heights, MI (US);
Michael B. Viola, Macomb Township, MI (US);
Jong-Hwan Lee, Rochester Hills, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A method and apparatus are described to selectively reduce NOemissions of an internal combustion engine. An exhaust aftertreatment system includes an injection device operative to dispense a hydrocarbon reductant upstream of a silver-alumina catalytic reactor device. A control system determines a NOconcentration and hydrocarbon/NOx ratio based upon selected parameters of the exhaust gas feedstream and dispenses hydrocarbon reductant during lean engine operation. Included is a method to control elements of the feedstream during lean operation. The hydrocarbon reductant may include engine fuel.