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:
Jan. 07, 2014
Filed:
Jan. 03, 2013
Applicant:
Man Truck & Bus Ag, Munich, DE;
Inventor:
Andreas Doering, Munich, DE;
Assignee:
MAN Truck & Bus AG, Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D 53/94 (2006.01); F01N 3/18 (2006.01); F01N 3/20 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method for use with an exhaust gas post-treatment system on an internal combustion engine operated with air surplus includes reducing nitrous oxides in that an ammonia-separating reducing agent is added to the exhaust gas flow upstream of a catalyst which is charged with a catalyst material for selective catalytic reduction of nitrous oxides. The method further provides that the NHto NOratio (feed ratio α) is varied in phases by changing the untreated nitrous oxide emissions of the internal combustion engine such that the feed ratio α oscillates in phases about a predefined value.