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:
Jan. 29, 2013
Filed:
Mar. 19, 2008
Yutaka Tanai, Susono, JP;
Tomihisa Oda, Numazu, JP;
Kazuhiro Itoh, Mishima, JP;
Shunsuke Toshioka, Susono, JP;
Takekazu Itoh, Toyota, JP;
Yutaka Tanai, Susono, JP;
Tomihisa Oda, Numazu, JP;
Kazuhiro Itoh, Mishima, JP;
Shunsuke Toshioka, Susono, JP;
Takekazu Itoh, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
In an internal combustion engine, an NOselective reducing catalyst is arranged in an engine exhaust passage. Urea is fed in the NOselective reducing catalyst, ammonia generated from this urea is adsorbed at the NOselective reducing catalyst, and the NOcontained in the exhaust gas is selectively reduced mainly by the adsorbed ammonia. An NOsensor able to detect NOand ammonia contained in the exhaust gas is arranged in the engine exhaust passage downstream of the NOselective reducing catalyst. It is judged that the amount of adsorption of ammonia at the NOselective reducing catalyst is saturated based on the detection value of the NOsensor when the feed of fuel to the engine is stopped during the deceleration operation.