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. 05, 1989
Filed:
Aug. 03, 1988
Applicant:
Inventor:
Hideyuki Tamura, Yokohama, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02D / ; F02M / ;
U.S. Cl.
CPC ...
123489 ; 123488 ; 3644315 ;
Abstract
An air/fuel ratio control system detects an air/fuel ratio indicative control parameter out of required precision range for initiating a control characteristics derivation process. The control characteristics derivation process is performed by varying constant consisting an air/fuel ratio dependent fuel delivery amount correction coefficient in trial basis to monitor fluctuation range of the correction coefficient. Based on the trial basis processings, the value of the constant is determined so as to compensate the precision level lowered in monitoring the air/fuel ratio.