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:
Nov. 13, 2001
Filed:
Mar. 27, 2000
Alexander Ketterer, Regensburg, DE;
Hartmut Pfleger, Donaustauf, DE;
Siemens Aktiengesellshaft, Munich, DE;
Abstract
In order to check the functional capability of a three-way catalytic converter of a lambda-controlled internal-combustion engine, the efficiency of the catalytic converter is determined in a conventional way by determining the oxygen storage capability of the catalytic converter. In order to be able to adjust the efficiency with regard to temperature changes, a substitute value for the temperature in the catalytic converter is calculated. Using this substitute value, the efficiency, which has been determined for the catalytic converter, is adjusted for temperature influences. The measure of the functional capability of the catalytic converter thus obtained is accurate even after non-steady-state operating phases of the internal-combustion engine when the catalytic converter is not yet isothermal.