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:
Mar. 24, 2015
Filed:
Apr. 10, 2012
Igor Anilovich, Walled Lake, MI (US);
John Coppola, Highland, MI (US);
Janean E. Kowalkowski, Northville, MI (US);
John F. Van Gilder, Webberville, MI (US);
Ognyan N. Yanakiev, Birmingham, MI (US);
Igor Anilovich, Walled Lake, MI (US);
John Coppola, Highland, MI (US);
Janean E. Kowalkowski, Northville, 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 for assessing NOgeneration efficiency in a diesel engine after-treatment (AT) system having a diesel oxidation catalyst (DOC) downstream of the engine generating the NOand a selective catalytic reduction (SCR) catalyst downstream of the DOC converting NOwith the aid of the NO. Engine exhaust gas flow is passed into the AT system and a reductant is injected into the gas flow between the DOC and the SCR catalyst. SCR inlet gas flow temperature is monitored during transient engine operation and DOC inlet and SCR catalyst outlet NOconcentrations are detected when the SCR catalyst inlet gas flow temperature is in a predetermined range. SCR catalyst NOconversion efficiency is determined using the detected DOC inlet and SCR catalyst outlet concentrations of NO. Additionally, whether the NOgeneration efficiency is at or above threshold efficiency is assessed by comparing the determined and threshold NOconversion efficiencies.