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:
Feb. 15, 2005
Filed:
Apr. 24, 2000
Rolf Brück, Bergisch-Gladbach, DE;
Bernhard Pfalzgraf, Ingolstadt, DE;
Rolf Brück, Bergisch-Gladbach, DE;
Bernhard Pfalzgraf, Ingolstadt, DE;
EMITEC Gesellschaft fuer Emissionstechnologie mbH, Lohmar, DE;
Abstract
A method and a device for controlling the temperature of an NOaccumulator to purify the exhaust gas stream of an internal combustion engine, can be used especially for diesel or lean-burn engines. A heat flow is carried off from the exhaust gas stream upstream of the NOaccumulator in the exhaust gas line depending on the operating state of the internal combustion engine, so that a maximum temperature of the NOaccumulator is not exceeded and more particularly so that a specified temperature range is maintained. In order to obtain a minimum operating temperature of the NOaccumulator, the internal combustion engine is operated at least at an air-fuel ratio of λ≦1 until the minimum operating temperature is reached.