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. 24, 2012
Filed:
Dec. 07, 2009
Phanindra Garimella, Bloomington, IN (US);
Andy Osburn, Nashville, IN (US);
John N. Chi, Raleigh, NC (US);
Joan M. Wills, Nashville, IN (US);
Phanindra Garimella, Bloomington, IN (US);
Andy Osburn, Nashville, IN (US);
John N. Chi, Raleigh, NC (US);
Joan M. Wills, Nashville, IN (US);
Cummins IP, Inc., Minneapolis, MN (US);
Abstract
According to one exemplary embodiment, an apparatus is disclosed for estimating an NOconversion efficiency of an SCR catalyst. The apparatus includes a catalyst degradation module for determining an SCR catalyst degradation factor and a NOconcentration module for determining an SCR catalyst inlet NOconcentration based on an interpretation of at least one NOdetector signal. Additionally, the apparatus includes an NHconcentration module for determining an SCR catalyst inlet NHconcentration, a temperature module for determining an SCR catalyst bed temperature of the at least one SCR catalyst, and a space velocity (SV) module for determining an exhaust gas SV for the SCR catalyst. A NOconversion efficiency module calculates a NOconversion efficiency value based at least partially on the SCR catalyst degradation factor, the SCR catalyst inlet NOconcentration, the SCR catalyst inlet NHconcentration, the exhaust gas SV, and the SCR catalyst bed temperature.