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. 25, 1990
Filed:
Jun. 30, 1988
Tatsuji Ikeda, Hiroshima, JP;
Tetsushi Hosokai, Hiroshima, JP;
Masaki Fujii, Hiroshima, JP;
Tetsuya Takata, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
An air-to-fuel ratio control system executes a feedback control of air-to-fuel ratio based on an output of an oxygen sensor. The oxygen sensor is judged to be active when a change of the output therefrom occurs to make a fuel mixture rich. For detecting the failure or breakdown of the oxygen sensor when the feedback air-to-fuel control is suspended, the air-to-fuel ratio control system comprises an activity sensor for detecting whether the oxygen sensor is active or inactive, an air-to-fuel ratio altering device for enforcing an alteration of air-to-fuel ratio to make a fuel mixture rich, and a judging device for judging the oxygen sensor to be broken down when no activity detection is made while the alteration of air-to-fuel ratio has been effected.