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:
Oct. 23, 2012
Filed:
Dec. 05, 2008
Kevin L. Perry, Fraser, MI (US);
Thompson M. Sloane, Oxford, MI (US);
Jong H. Lee, Rochester Hills, MI (US);
Kushal Narayanaswamy, Sterling Heights, MI (US);
Wei LI, Troy, MI (US);
Paul M. Najt, Bloomfield Hills, MI (US);
Kevin L. Perry, Fraser, MI (US);
Thompson M. Sloane, Oxford, MI (US);
Jong H. Lee, Rochester Hills, MI (US);
Kushal Narayanaswamy, Sterling Heights, MI (US);
Wei Li, Troy, MI (US);
Paul M. Najt, Bloomfield Hills, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
Exhaust emissions from a spark-ignition direct-injection engine connected to an oxidation catalytic device and a selective catalyst reduction device having a capacity to store ammonia reductant are controlled. The engine operates in a first combustion mode to generate ammonia reductant, stored on the second aftertreatment device. The engine operates lean of stoichiometry and nitrides of oxygen in the exhaust gas feedstream are reduced on the second aftertreatment device.