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:
Jan. 16, 2001
Filed:
Sep. 27, 1999
Hisashi Mitsumoto, Kanagawa, JP;
Kouji Ishihara, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
In a device for purifying an exhaust gas mixture from an engine, a catalyst traps and reduces NOx in dependence of the air fuel ratio of the exhaust gas mixture from the engine. A controller detects a predetermined condition to initiate a catalyst regenerating control to reduce NOx in the catalyst, and controls the engine in a catalyst regeneration control mode when the predetermined condition is detected. In the catalyst regeneration control mode, the controller sets the fuel injection timing on the compression stroke and the fuel injection quantity at a level to make the average air fuel ratio in a combustion chamber equal to or leaner than the stoichiometric ratio and to produce a rich air fuel mixture region richer than the stoichiometric ratio in the vicinity of a spark plug.