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:
Apr. 24, 2012
Filed:
Apr. 30, 2008
John N. Chi, Columbus, IN (US);
Weiwen Wang, Columbus, IN (US);
Phanindra Garimella, Columbus, IN (US);
Joan M. Wills, Nashville, IN (US);
Joe V. Hill, Middlesbrough, GB;
Lisa A. Farrell, Columbus, IN (US);
Abdul R. Ofoli, Columbus, IN (US);
John N. Chi, Columbus, IN (US);
Weiwen Wang, Columbus, IN (US);
Phanindra Garimella, Columbus, IN (US);
Joan M. Wills, Nashville, IN (US);
Joe V. Hill, Middlesbrough, GB;
Lisa A. Farrell, Columbus, IN (US);
Abdul R. Ofoli, Columbus, IN (US);
Cummins IP, Inc., Minneapolis, MN (US);
Abstract
Various embodiments of an apparatus, system, and method are disclosed for reducing NOemissions on an SCR catalyst. For example, according to one representative embodiment, an apparatus for reducing NOemissions in an engine exhaust includes a NOreduction target module that is configured to determine a NOreduction requirement that includes an amount of NOin the exhaust gas stream to be reduced on a selective catalytic reduction (SCR) catalyst. The apparatus also includes an ammonia target module that is configured to determine an ammonia addition requirement that includes an amount of ammonia added to the exhaust gas stream to achieve the NOreduction requirement. The apparatus also includes a reductant target module that is configured to determine a reductant injection requirement that includes an amount of reductant added to the exhaust gas stream to achieve the ammonia addition requirement. The apparatus further includes a reductant limiting module that is configured to determine whether at least one reductant limiting condition is met and to limit the amount of reductant added in response to the at least one reductant limiting condition if the at least one reductant limiting condition has been met.