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:
Nov. 09, 1999
Filed:
Apr. 17, 1998
Toru Hanafusa, Susono, JP;
Michihiro Ohashi, Mishima, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-ken, JP;
Abstract
A device for determining the abnormal degree of deterioration of catalyst of a catalytic converter arranged in an internal combustion engine exhaust system is disclosed. The device comprises a purification ability grasping unit for grasping a current purification ability of the catalyst and a temperature sensor for grasping a current temperature of the catalyst. Therefore, a threshold of the purification ability which corresponds to the abnormal degree of deterioration of the catalyst is determined in accordance with the current temperature of the catalyst. An appraisal value is determined in accordance with a difference between the threshold and the current purification ability. It is determined that the degree of deterioration of the catalyst is abnormal when the integration value of the appraisal value exceeds a predetermined value.