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. 20, 2004
Filed:
Nov. 14, 2000
Applicant:
Inventor:
Bernhard Pfalzgraf, Ingolstadt, DE;
Assignee:
Audi AG, , DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01N 3/00 ;
U.S. Cl.
CPC ...
F01N 3/00 ;
Abstract
In a process for operation of an internal combustion engine having a NOx storage catalytic converter, after desulfuration is required the mode of operation of the internal combustion engine is changed to &lgr; <1 and secondary air is injected upstream from the NOx storage catalytic converter ( ) during a first time interval T . After secondary air injection is interrupted, the internal combustion engine is operated at &lgr; <1 during a second time interval T . Normal operation of the internal combustion engine is subsequently resumed. This process makes simple desulfuration of the NOx storage catalytic converter ( ) possible (FIG. ).