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:
Oct. 22, 2002
Filed:
Sep. 20, 2000
AB Volvo, , SE;
Abstract
A method and arrangement for control of a combustion engine ( ) having control elements ( ) for generation of an air/fuel mixture to each cylinder ( ) of the engine ( ), an exhaust system ( ) which is connected to the engine ( ), an exhaust catalyst ( ) and a NOx absorbent ( ) which are provided in the exhaust system ( ), which method comprises: control of the control elements ( ) in a first operating condition for generation of a comparatively lean exhaust gas mixture to the NOx adsorbent ( ) for adsorption of NOx compounds in the exhaust gas mixture, and control of the control elements ( ) in a second operating condition for generation of a comparatively rich exhaust gas mixture to the NOx absorbent ( ) for desorption of NOx compounds in the exhaust gas mixture. The invention is characterized in that it comprises: detection of whether at least one condition in the vehicle prevails which corresponds to an initiation of a change-over from the first operating condition to the second operating condition, wherein all adjustment of the air/fuel mixture to the engine ( ) is carried out, wherein the generation of a rich exhaust gas mixture is initiated for desorption of NOx compounds in the NO adsorbent ( ) depending on the conditions.