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:
Sep. 23, 2014
Filed:
Apr. 10, 2012
Igor Anilovich, Walled Lake, MI (US);
Janean E. Kowalkowski, Northville, MI (US);
Cheryl J. Stark, Canton, MI (US);
John F. Van Gilder, Webberville, MI (US);
Ognyan N. Yanakiev, Birmingham, MI (US);
Igor Anilovich, Walled Lake, MI (US);
Janean E. Kowalkowski, Northville, MI (US);
Cheryl J. Stark, Canton, MI (US);
John F. Van Gilder, Webberville, MI (US);
Ognyan N. Yanakiev, Birmingham, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A method of assessing non-methane hydrocarbon (NMHC) conversion efficiency in a diesel after-treatment (AT) system having a diesel oxidation catalyst (DOC) arranged upstream of a diesel particulate filter (DPF) includes regenerating the AT system. Additionally, the method monitors DOC inlet and outlet temperatures during the regeneration. The method also assesses whether the DOC is operating at or above threshold efficiency by determining a DOC inlet/outlet temperature difference and comparing the determined inlet/outlet temperature difference with a threshold inlet/outlet temperature difference. The method also monitors DPF outlet temperature if the DOC is operating at or above the threshold efficiency and determines a DOC temperature/DPF outlet temperature difference. The method additionally assesses whether NMHC conversion efficiency of the DPF is at or above a threshold value by comparing the determined DOC temperature/DPF outlet temperature difference with a threshold DOC temperature/DPF outlet temperature difference. A system and a vehicle are also disclosed.