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:
Jun. 11, 2002
Filed:
Sep. 18, 2000
Applicant:
Inventor:
Bertrand Lemire, Schierling, DE;
Assignee:
Siemens Aktiengesellschaft, Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01N 3/00 ;
U.S. Cl.
CPC ...
F01N 3/00 ;
Abstract
A method and device for checking the functional ability of a catalyst in an exhaust duct of an internal combustion engine is described. The method and device determines a degree of conversion as a function of the temperature of the catalyst during a heating-up phase. Evaluation of the relationship between the degree of conversion and the temperature, the relationship changing with the age of the catalyst, allows a non-functional catalyst to be checked and diagnosed with high accuracy.