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:
May. 13, 2014
Filed:
Jan. 26, 2011
Shouxian Ren, Ypsilanti, MI (US);
Scott R. Gordon, Ann Arbor, MI (US);
Shouxian Ren, Ypsilanti, MI (US);
Scott R. Gordon, Ann Arbor, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A method and system for determining conversion of NO to NOin an engine exhaust stream by an oxidation catalyst during operation of the engine is disclosed based on injecting hydrocarbon fuel into the exhaust stream upstream of the oxidation catalyst, measuring a temperature of the exhaust stream on the upstream and downstream sides of the oxidation catalyst, calculating a difference in exhaust stream temperature between the upstream and downstream sides of the oxidation catalyst, and determining the conversion of NO to NOby the oxidation catalyst from the difference in exhaust stream temperature based on a predetermined correlation profile between the temperatures on the upstream and downstream sides of the oxidation catalyst and conversion of NO to NO.