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. 31, 2015
Filed:
Jul. 12, 2010
Applicants:
Chun Tai, Hagerstown, MD (US);
Timothy Booher, Franklin, KY (US);
Heath Morris, Martinsburg, WV (US);
Inventors:
Chun Tai, Hagerstown, MD (US);
Timothy Booher, Franklin, KY (US);
Heath Morris, Martinsburg, WV (US);
Assignee:
Mack Trucks, Inc., Greensboro, NC (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01N 3/00 (2006.01); F01N 3/20 (2006.01);
U.S. Cl.
CPC ...
F01N 3/208 (2013.01); F01N 2900/1621 (2013.01); Y02T 10/24 (2013.01);
Abstract
Methods and systems for controlling reductant levels in an SCR catalyst are provided. In one aspect, reductant levels are adjusted in response to a ratio of change of NOx conversion efficiency to a change of reductant level. In another aspect, reductant injection levels are periodically adjusted to see if NOx conversion efficiency is better or worse at the adjusted levels.