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. 30, 2004
Filed:
Aug. 15, 2003
Helmut Daudel, Schorndorf, DE;
Guenther Hohenberg, Darmstadt, DE;
DaimlerChrysler AG, Stuttgart, DE;
Abstract
An operating internal combustion engine with at least one cylinder ( ), and a piston ( ), which can move in an alternating manner therein, is used to compress a fuel mix in a combustion chamber ( ). In order to determine the nitrogen oxide content in oxygen-containing exhaust gases, the quantity of fuel fed to the cylinder ( ) and the air mass flowing in an induction pipe ( ) are recorded and are fed to an electronic circuit ( ). The center of gravity (S) of the combustion is determined from at least one current measured value for the engine operation, and the level of nitrogen oxide emissions is calculated from the value for the center of gravity (S) of the combustion, including the values for the recorded fuel quantity and air mass.