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:
Aug. 30, 2005
Filed:
Aug. 23, 2002
Yasuyuki Miyahara, Wako, JP;
Masahiro Sato, Wako, JP;
Masaki Ueno, Wako, JP;
Kenichi Ohmori, Wako, JP;
Yasuyuki Miyahara, Wako, JP;
Masahiro Sato, Wako, JP;
Masaki Ueno, Wako, JP;
Kenichi Ohmori, Wako, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
After an enginehas started to operate, a state in which a humidity represented by an output of a humidity sensordownstream of a hydrocarbon adsorbenttakes a minimum value is sequentially searched for, and a timing at which the humidity changes from the minimum value to a monotonously increasing state is grasped as a timing at which the adsorption of moisture and hydrocarbons by the hydrocarbon adsorbentis saturated. After the engine has started to operate, a parameter representing an integrated amount of moisture given to the hydrocarbon adsorbentby the exhaust gas is sequentially generated, and a deteriorated state of the hydrocarbon adsorbentis evaluated based on the value of the parameter at the timing at which the adsorption is saturated. The deteriorated state of the hydrocarbon absorbent can thus accurately be evaluated by an inexpensive arrangement which employs the humidity sensordisposed downstream of the hydrocarbon adsorbent