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. 03, 2003
Filed:
Aug. 29, 2002
Eckard Irion, Waldenbuch, DE;
Aleksandar Knezevic, Friedrichshafen, DE;
Holger Leye, Unterensingen, DE;
Mirko Smuk, Waghäusel, DE;
Conti Temic Microelectronic GmbH, Nürnberg, DE;
Abstract
A method for determining the reducing agent concentration (NH ) in the exhaust-gas flow of an internal combustion engine, using a zeolitic NH gas sensor that supplies a base measuring value, which is initially corrected by an offset value and a correction value that depends on the H O concentration of the exhaust gas to form an intermediate value. The intermediate value is subsequently corrected by an additional value that depends on the NO and NH concentration of the exhaust gas. In particular at or above the limits for the operating range, the accuracy of the method increases for one of the following conditions: gas compositions with NO concentrations >500 ppm, extremely low NH concentrations <20 ppm or high NH concentrations >100 ppm.