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:
Nov. 10, 2015
Filed:
Jul. 30, 2012
Chang H. Kim, Rochester, MI (US);
Janean E. Kowalkowski, Northville, MI (US);
David N. Belton, Birmingham, MI (US);
Steven J. Schmieg, Troy, MI (US);
Chang H. Kim, Rochester, MI (US);
Janean E. Kowalkowski, Northville, MI (US);
David N. Belton, Birmingham, MI (US);
Steven J. Schmieg, Troy, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
The capacity of a platinum-containing diesel oxidation catalyst (DOC) to simultaneously convert NO to NO, CO to carbon dioxide, and remaining hydrocarbons to carbon dioxide and water in the exhaust system of a vehicle diesel engine may be evaluated and diagnosed using measured DOC exhaust inlet temperatures and outlet temperatures at a relatively high exhaust temperature and, soon thereafter, at a relatively low exhaust inlet temperature. Values of the platinum-containing DOC exotherms at the high and low DOC inlet temperatures are found to provide a basis for evaluation of both NO conversion and the HC and CO conversion capabilities of the DOC. The process may be repeated as the catalyzed DOC conversion efficiency changes with use. The practice may also be used to evaluate the performance of oxidation catalysts used in a like way in treating the exhaust from a lean-burn gasoline engine.