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:
Aug. 30, 2016
Filed:
Sep. 25, 2012
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi, JP;
Abstract
In an internal combustion engine, an exhaust purification catalyst: (), particulate filter (), and hydrocarbon feed valve () are arranged in an engine exhaust passage. A low pressure exhaust gas recirculation system (LPL) is provided for making the exhaust gas downstream of the particulate filter () recirculate. If hydrocarbons are injected from the hydrocarbon feed valve (), the carbon dioxide which is produced in the exhaust purification catalyst () is recirculated and the air-fuel ratio of the exhaust gas which flows into the exhaust purification catalyst () temporarily drops. At the time of regeneration of the particulate filter (), hydrocarbons are injected from, the hydrocarbon feed valve () so as not to overlap with this temporary drop of the air-fuel ratio.