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. 16, 1994
Filed:
Feb. 18, 1993
Applicant:
Inventor:
Masaaki Aihara, Musashino, JP;
Assignee:
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
F01N / ;
U.S. Cl.
CPC ...
60276 ; 60274 ; 60277 ;
Abstract
In a detecting method for deterioration of a catalyst inserted in an exhaust pipe, first, counting the number of times to cut the predetermined slice levels set in accordance with the engine operating conditions by O.sub.2 -sensors provided at the front and rear portions of the catalyst respectively. Then, a ratio of the counted numbers is calculated to judge a deterioration of a catalyst of a catalytic converter. Thus, influence of an output amplitude fluctuation of the RO.sub.2 sensor varying according to the operating condition is avoided to prevent a misjudgement of the deterioration of the catalyst.