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:
Sep. 25, 2007
Filed:
Jun. 02, 2005
Kazuhiro Itoh, Mishima, JP;
Toshiaki Tanaka, Numazu, JP;
Eiji Iwasaki, Susono, JP;
Shinya Hirota, Susono, JP;
Kazuhiro Itoh, Mishima, JP;
Toshiaki Tanaka, Numazu, JP;
Eiji Iwasaki, Susono, JP;
Shinya Hirota, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Abstract
A catalyst () suitable for reduction of the NOin an exhaust gas by ammonia in the presence of excess oxygen is arranged in the exhaust passage () of an internal combustion engine. An aqueous urea solution is fed through a flow control valve () to the inside of the exhaust passage () upstream of the catalyst (). When the temperature of the catalyst () is low, a large amount of the aqueous urea solution is fed to make the urea contained in the aqueous urea solution be stored in the catalyst (). When the engine is accelerated and the temperature of the catalyst () rises, ammonia is released at a little at a time from the inside of the catalyst () and the NOin the exhaust gas is reduced by the released ammonia.