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. 22, 2013
Filed:
Oct. 20, 2012
Applicant:
Southwest Research Institute, San Antonio, TX (US);
Inventor:
Charles E. Roberts, Jr., Helotes, TX (US);
Assignee:
Southwest Research Institute, San Antonio, TX (US);
Primary Examiner:
Int. Cl.
CPC ...
B01D 53/56 (2006.01); B01D 53/94 (2006.01); F01N 3/10 (2006.01); F01N 3/24 (2006.01);
U.S. Cl.
CPC ...
Abstract
Methods and systems for treating NOx-containing exhaust from an internal combustion engine. An exhaust aftertreatment system has at least a PM control device and a downstream selective reduction catalyst (SCR) device. By using a bypass line to divert engine-out exhaust around the PM control device, or by introducing NO or NO2 from a non-engine source, the NO/NOx ratio into the SCR device can be controlled to a desired ratio for improved SCR efficiency.