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:
Oct. 30, 2012
Filed:
Oct. 03, 2007
Takayuki Demura, Mishima, JP;
Masakazu Yamamoto, Kariya, JP;
Takayuki Demura, Mishima, JP;
Masakazu Yamamoto, Kariya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Abstract
An internal combustion engine wherein three-way catalysts are arranged in an exhaust passage of a first cylinder group and an exhaust passage of a second cylinder group and a common NOstorage catalyst is arranged downstream of the three-way catalysts. When the NOstorage catalyst should be raised in temperature, the air-fuel ratio of a part of the cylinders in each cylinder group is made rich and the air-fuel ratio of a part of the cylinders in each cylinder group is made lean to raise the NOstorage catalyst in temperature by the heat of oxidation reaction at the three-way catalysts.