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. 14, 2003
Filed:
Jan. 16, 2001
Applicant:
Inventors:
Jens Drückhammer, Braunschweig, DE;
Frank Schulze, Vortorf, DE;
Axel Lang, Wolfenbüttel, DE;
Assignee:
Volkswagen AG, , DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01J 2/034 ;
U.S. Cl.
CPC ...
B01J 2/034 ;
Abstract
An NO concentration in exhaust gas is measured downstream of an NO storage converter. For determining an operating state, particularly damage to the NO storage converter, when the NO storage converter switches from an absorption mode to a regeneration mode, the values of characteristic features of an NO desorption peak in the time curve of the NOx concentration are ascertained and compared to predetermined test patterns, with a comparison result being formed, from which a converter-state signal that characterizes the operating state of the NO converter is determined.