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:
Oct. 02, 2012
Filed:
Jun. 06, 2008
Zhiyong Wei, Chicago, IL (US);
Zhiyong Wei, Chicago, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
An exhaust system for an internal combustion engine includes an upstream segment and a downstream segment connecting with the upstream segment. The downstream segment is a NOx reducing segment having an exhaust gas outlet and a reductant inlet disposed between the exhaust gas outlet and an exhaust gas inlet for the downstream segment. The upstream segment further includes a coating having a catalyst configured to increase a ratio of NOto NO in exhaust gases passing through the upstream segment. The coating includes a catalyst distribution, which may be a catalyst coating length, which is linked to a target ratio of NOto NO for reducing NOx in the downstream segment. The catalyst distribution in the upstream segment is adapted to increase the ratio of NOto NO, while limiting the ratio of NOto NO to a ratio optimized for reduction of NOx in the downstream segment.