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:
Dec. 27, 2005
Filed:
Aug. 23, 2002
Shiro Takakura, Wako, JP;
Tetsuo Endo, Wako, JP;
Kei Machida, Wako, JP;
Norihito Watanabe, Wako, JP;
Shiro Takakura, Wako, JP;
Tetsuo Endo, Wako, JP;
Kei Machida, Wako, JP;
Norihito Watanabe, Wako, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A humidity sensoris disposed downstream of an exhaust gas purifier comprising a hydrocarbon adsorbing catalyst, and an air-fuel ratio sensoris disposed at least downstream of the exhaust gas purifier. The hydrocarbon adsorbing ability of a hydrocarbon adsorbent of a hydrocarbon adsorbing catalyst(the exhaust gas purifier) is evaluated using output data of the humidity sensor. The unburned gas purifying ability based on a catalytic action of the hydrocarbon adsorbing catalystis evaluated using output data of the air-fuel ratio sensor. Based on the evaluated results, the overall deteriorated state of the exhaust gas purifier is evaluated. The overall deteriorated state of the exhaust gas purifier which has the hydrocarbon adsorbing catalystcan thus adequately be evaluated.