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. 05, 2012
Filed:
Dec. 20, 2008
Jochen Lahr, Stuttgart, DE;
Rainer Pauls, Vaihingen, DE;
Jochen Lahr, Stuttgart, DE;
Rainer Pauls, Vaihingen, DE;
Daimler AG, Stuttgart, DE;
Abstract
In a method for determining an NOconcentration and/or a concentration ratio of NOand NO in an exhaust tract of a combustion device, such as an internal combustion engine, an NOx sensor that is sensitive with respect to NOand NO is utilized, which provides a NOx output signal correlating with an NOx concentration representing the sum of the concentrations of NOand NO. In order to determine the NOconcentration and/or the concentration ratio of NOand NO, the NOx output signal of a first NOx sensor, which is arranged upstream of an exhaust gas treatment element arranged in the exhaust tract and having the capability of converting NO to NOand/or converting NOto NO, is compared to the NOx output signal of a second NOx sensor, which is disposed downstream of the exhaust gas treatment element.