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. 17, 2013
Filed:
Feb. 27, 2009
Hiroshi Miyamoto, Susono, JP;
Toru Kidokoro, Hadano, JP;
Hiroshi Sawada, Gotenba, JP;
Yasushi Iwazaki, Ebina, JP;
Koichi Kimura, Numazu, JP;
Koichi Kitaura, Odawara, JP;
Hiroshi Miyamoto, Susono, JP;
Toru Kidokoro, Hadano, JP;
Hiroshi Sawada, Gotenba, JP;
Yasushi Iwazaki, Ebina, JP;
Koichi Kimura, Numazu, JP;
Koichi Kitaura, Odawara, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A catalyst deterioration diagnosing apparatus is provided with means for performing stoichiometric feedback control on the air-fuel ratio based on at least output from an upstream air-fuel ratio sensor provided upstream of a catalyst, means for measuring the oxygen storage capacity of the catalyst, and means for correcting the measured value of the oxygen storage capacity based on at least the output behavior of a downstream air-fuel ratio sensor provided downstream of the catalyst during the stoichiometric feedback control. The measured value of the oxygen storage capacity is corrected using the output behavior of the downstream air-fuel ratio sensor during stoichiometric feedback control. The diagnostic is performed after eliminating the effects from sulfur by correcting the measured value to a value corresponding to when low sulfur fuel is used, which makes it possible to prevent an erroneous diagnosis from being made.