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. 02, 2005
Filed:
Sep. 17, 2004
Takayuki Demura, Mishima, JP;
Hiroyasu Koyama, Mishima, JP;
Kaoru Ohtsuka, Mishima, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An exhaust gas purifying apparatus adopted to an internal combustion engine provided with air-fuel ratio learning means for learning a primary air-fuel ratio given in the form of a mass ratio between air and fuel introduced into a combustion chamber, comprises an exhaust gas purifying catalyst provided in an exhaust gas passage of the engine and a catalyst activating means for supplying secondary air to an upstream of the exhaust gas purifying catalyst and increasing the quantity of fuel supplied to the engine to activate the exhaust gas purifying catalyst. The apparatus further comprises air-fuel ratio learning determining means for, when the internal combustion engine is started, determining whether or not learning of the primary air-fuel ratio by the air-fuel ratio learning means is completed; and activation control means for, when determined that the learning of the primary air-fuel ratio is not completed, prohibiting supply of the secondary air and increase of the quantity of fuel by the catalyst activation means.