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:
Mar. 18, 2014
Filed:
Apr. 15, 2009
Daiji Nagaoka, Fujisawa, JP;
Teruo Nakada, Fujisawa, JP;
Hiroyuki Yuza, Fujisawa, JP;
Isuzu Motors Limited, Tokyo, JP;
Abstract
An exhaust gas purification method, and system. In order from an upstream side of an engine exhaust passage there are provided, a NOx occlusion-reduction catalyst, a hydrocarbon ('HC') adsorbing member, and a catalyzed diesel particulate filter or oxidation catalyst. During NOx regeneration control, an air-fuel ratio of exhaust gas in terms of excess air factor is taken to be 0.8 to 1.1 when an index temperature representative of the HC-adsorbing member is a first judgment temperature or less, is taken to be 1.0 to 1.1 when the index temperature is between a first judgment temperature and a second judgment temperature, and is taken to be 0.8 to 1.1 when the index temperature is the second judgment temperature or above, causing an outflow of HC to the atmosphere to be reduced.