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:
Mar. 09, 1993
Filed:
May. 15, 1991
Shigetaka Kuroda, Wako, JP;
Hiroshi Ono, Wako, JP;
Honda Giken Kogyo K.K., Tokyo, JP;
Abstract
A system for detecting deterioration of a three-way catalyst of an internal combustion engine. Cutting-off of the fuel supply to the engine is started when the engine is decelerated with the throttle valve substantially fully closed, and the fuel supply to the engine is resumed when the rotational speed of the engine has become lower than a predetermined value. Time is measured which output from the air-fuel ratio sensor has required to reach a predetermined reference value after the resumption of the fuel supply to the engine. It is determined that the three-way catalyst is deteriorated when the time measured is shorter than a predetermined time period.