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:
Nov. 12, 2002
Filed:
May. 16, 2001
Akira Tayama, Yokosuka, JP;
Hirofumi Tsuchida, Yokosuka, JP;
Toshikazu Shiino, Chigasaki, JP;
Kaname Naganuma, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
An upstream catalyst ( ) which stores oxygen in exhaust gas and releases the stored oxygen for oxidizing a reducing agent component contained in the exhaust gas, and a downstream catalyst ( ) which stores nitrogen oxides in the exhaust gas and releases the stored nitrogen oxides by reducing the stored nitrogen oxides by the reducing agent component contained in the exhaust gas, are provided in an exhaust passage ( ) of an engine ( ). When the storage amount of nitrogen oxides of the downstream catalyst ( ) reaches a predetermined value, additional fuel is injected from a fuel injector ( ) after combustion, and stored oxygen in the upstream catalyst ( ) is released by the reducing agent components in the additional fuel. After release of oxygen, the supply of the additional fuel is stopped and the supply of the main fuel is increased.