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:
Jul. 24, 2001
Filed:
Mar. 16, 2000
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
An exhaust emission control device of an engine,comprises an NOx storage catalyst,which traps and stores NOx in exhaust gas and reduces the stored NOx according to an air fuel ratio of inflowing exhaust gas. A controller,determines conditions for discharging the SOx stored in the catalyst,. When SOx discharge conditions are satisfied and the engine running conditions are in a predetermined SOx discharge running region, the controller,performs SOx discharge control of the catalyst,. As lean air fuel ratio control is prohibited from when SOx discharge conditions are satisfied to when SOx discharge is complete, lean air fuel ratio control is prevented from taking place when the NOx trapping capacity of the catalyst,is insufficient, and increase of exhaust emission is thereby prevented.