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:
Jul. 09, 2013
Filed:
Apr. 08, 2011
Shouxian Ren, Ypsilanti, MI (US);
Rahul Mital, Rochester Hills, MI (US);
Jason Daniel Mullins, Brighton, MI (US);
Shouxian Ren, Ypsilanti, MI (US);
Rahul Mital, Rochester Hills, MI (US);
Jason Daniel Mullins, Brighton, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
An exhaust system for an engine comprises a selective catalytic reduction ('SCR') device having a NOreducing selective catalytic reduction composition disposed thereon. A particulate filter is disposed in the rigid shell or canister downstream of the selective catalytic reduction device. An ammonia dosing system comprising a controller in signal communication with NOsensors located upstream and downstream of the selective catalytic reduction device for injection of ammonia into the exhaust gas upstream of the SCR device based on information collected from the NOsensors to thereby optimize the reduction of NOin the exhaust gas. An ammonia-neutral oxidation catalyst compound is disposed on the wall-flow substrate of the particulate filter device and is configured to pass through ammonia constituents of the exhaust gas exiting the selective catalytic reduction device with little or no conversion of the ammonia constituents to N2, N2O and NO.