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. 01, 2013
Filed:
Jul. 02, 2008
Takamitsu Asanuma, Mishima, JP;
Shinya Hirota, Susono, JP;
Kohei Yoshida, Gotenba, JP;
Hiromasa Nishioka, Susono, JP;
Hiroshi Otsuki, Susono, JP;
Tomihisa Oda, Numazu, JP;
Shunsuke Toshioka, Susono, JP;
Takamitsu Asanuma, Mishima, JP;
Shinya Hirota, Susono, JP;
Kohei Yoshida, Gotenba, JP;
Hiromasa Nishioka, Susono, JP;
Hiroshi Otsuki, Susono, JP;
Tomihisa Oda, Numazu, JP;
Shunsuke Toshioka, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Abstract
In an internal combustion engine, an NOselective reduction catalyst () is arranged in an engine exhaust passage, and an NOstorage catalyst () is arranged in the engine exhaust passage upstream of the NOselective reduction catalyst (). When the amount of NOstored in the NOstorage catalyst () exceeds a predetermined allowable value, the NOstorage catalyst () is raised in temperature to make the NOstorage catalyst () release the NO. The amount of urea feed is decreased by exactly the amount of reduction of the calculated stored NOamount with respect to the amount of urea feed determined from the engine operating state, and the amount of urea feed is increased by exactly the amount of reduction of the calculated released NOamount with respect to the amount of urea feed determined from the engine operating state.