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. 12, 2002
Filed:
Feb. 10, 2000
Naohide Fuwa, Susono, JP;
Hiroshi Tanaka, Susono, JP;
Yukio Kinugasa, Susono, JP;
Takaaki Itou, Mishima, JP;
Naoto Suzuki, Susono, JP;
Takehisa Yaegashi, Mishima, JP;
Kouhei Igarashi, Susono, JP;
Kouichi Takeuchi, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An exhaust manifold ( ) of an engine ( ) is connected to a three way (TW) catalyst ( ), and the TW catalyst ( ) is connected to an NH adsorbing and oxidizing (NH -AO) catalyst ( ). The engine ( ) performs the lean and the rich engine operations alternately and repeatedly. When the engine ( ) performs the rich operation and thereby the exhaust gas air-fuel ratio of the exhaust gas flowing into the TW catalyst ( ) is made rich, NO in the inflowing exhaust gas is converted to NH in the TW catalyst ( ). The NH is then adsorbed in the NH -AO catalyst ( ). Next, when the engine ( ) performs the lean operation and thereby the exhaust gas air-fuel ratio of the exhaust gas flowing into the TW catalyst ( ) is made lean, NO in the exhausted gas passes through the TW catalyst ( ), and flows into the NH -AO catalyst ( ). At this time, NH adsorbed in the catalyst ( ) is desorbed therefrom, and reduces the inflowing NO .