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:
Nov. 10, 1998
Filed:
Jan. 26, 1996
Applicant:
Inventors:
Assignee:
Mazda Motor Corporation, Hiroshima, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01N / ;
U.S. Cl.
CPC ...
60276 ; 60277 ; 60288 ; 123688 ; 123685 ;
Abstract
An air-fuel control system for an internal combustion engine is equipped with an exhaust system having a catalytic converter, a linear O.sub.2 sensor and a .lambda.O.sub.2 sensor for feedback controlling an air-fuel ratio on the basis of output representative of oxygen content from at least the linear O.sub.2 sensor. The system delivers a target air-fuel ratio of a fuel mixture. A determinant output, based on which the air-fuel ratio is feedback controlled, is shifted from output from the linear O.sub.2 sensor to output from the .lambda.O.sub.2 sensor before the linear O.sub.2 sensor is effectively active.