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:
May. 19, 1998
Filed:
Jul. 24, 1996
Toru Hanafusa, Susono, JP;
Michihiro Ohasi, Mishima, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Abstract
A device for determining an abnormal degree of deterioration of catalyst of a catalytic converter, arranged in an internal combustion engine exhaust system, is disclosed. The device comprises a temperature sensor for measuring a temperature of the catalyst and an electronic control unit which assumes a temperature of the catalyst on the basis of the engine operating condition and calculates a ratio of a varying value of the measured temperature by the temperature sensor to a varying value of the assumed temperature and determines that the degree of deterioration of the catalyst is abnormal when the ratio is smaller than a predetermined value.