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. 13, 2016
Filed:
Feb. 05, 2013
Yuki Haba, Mishima, JP;
Kohei Yoshida, Gotenba, JP;
Yuki Haba, Mishima, JP;
Kohei Yoshida, Gotenba, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A hydrocarbon feed valve and an exhaust purification catalyst are arranged in an engine exhaust passage. A first NOpurification method which injects hydrocarbons from the hydrocarbon feed valve by a predetermined period to thereby remove NOwhich is contained in the exhaust gas and a second NOpurification method which makes the air-fuel ratio of the exhaust gas which flows into the exhaust purification catalyst rich to make the exhaust purification catalyst release the stored NOwhen the NOwhich is stored in the exhaust purification catalyst exceeds a first allowable value are selectively used. Hydrocarbons are injected from the hydrocarbon feed valve by the predetermined period, and when the NOwhich is stored in the exhaust purification catalyst exceeds a second allowable value which is smaller than the first allowable value, the air-fuel ratio of the exhaust gas which flows into the exhaust purification catalyst is made rich.