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:
Oct. 27, 2009
Filed:
Oct. 31, 2006
Masakazu Miyasako, Tokyo, JP;
Koji Wada, Tokyo, JP;
Makoto Nakano, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A catalyst deterioration diagnosis apparatus for an internal combustion engine, comprising means for subjecting output signals of an upstream-side and a downstream-side Osensors to weighted correction processes corresponding to output levels, means for calculating amplitude magnitudes of the output signals of the upstream-side and the downstream-side Osensors after the weighted correction processes, and time integral values of differences between predetermined signals and the output signals of the upstream-side and downstream-side Osensors after the weighted correction processes, means for calculating a deterioration diagnosing parameter on the basis of the amplitude magnitudes and the time integral values, means for deciding deterioration of a catalyst converter on the basis of a result of a comparison between the calculated deterioration diagnosing parameter and a predetermined deterioration decision threshold value, and warning means for issuing warning when the catalyst deterioration has been decided.