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. 13, 2001
Filed:
Jun. 15, 1999
Applicant:
Inventors:
Assignee:
Nissan Motor Co., Ltd., Yokohama, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01N 3/00 ;
U.S. Cl.
CPC ...
F01N 3/00 ;
Abstract
A three-way catalyst (,) which has an oxygen storage capacity is disposed in an exhaust passage (,) and HC adsorbent-catalysts (,) which can adsorb and oxidize HC are disposed further downstream. If release of HC from the HC adsorbent-catalysts is determined, the lean level of an air-fuel ratio is increased temporarily after HC release is commenced. Thereafter the air-fuel ratio is controlled to a lower lean level which corresponds to an HC concentration during release. In this way, after lean control is commenced, the three-way catalyst is saturated in a short time and oxygen is sent to the HC adsorbent-catalysts (,) and released HC is oxidized.