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:
Jul. 10, 2007
Filed:
Jul. 18, 2006
Shinya Fujimoto, Hyogo, JP;
Shinya Fujimoto, Hyogo, JP;
Mitsubishi Electronic Corporation, Tokyo, JP;
Abstract
In a system that executes air fuel ratio feedback control based on air fuel ratio signals of a pair of air fuel ratio sensors arranged at locations upstream and downstream of a catalyst of an internal combustion engine, an abnormality diagnosis apparatus can diagnose abnormality in a fuel system of the internal combustion engine in an accurate manner by using a signal of the air fuel ratio sensor downstream of the catalyst. A control unit in the form of an ECU () includes a feedback operation state determination section (), an oxygen storage saturation determination section (), an averaging start determination section (), an averaging section (), and an abnormality determination section (). An abnormality in the fuel system of the internal combustion engine is determined by using a second air fuel ratio signal (V) output from the second air fuel ratio sensor downstream of the catalyst only when the amount of oxygen storage in the catalyst is saturated.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile