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:
Oct. 27, 1992
Filed:
Dec. 10, 1990
Applicant:
Inventor:
Bor-Dong Chen, Dearborn, MI (US);
Assignee:
Ford Motor Company, Dearborn, MI (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
F02D / ;
U.S. Cl.
CPC ...
123674 ; 123696 ;
Abstract
The rich or lean status of an air/fuel control system is determined according to the difference between the time period that the normalized air/fuel ratio is greater than an upper limit and the time period that the normalized air/fuel ratio is less than a lower limit in equal number of successive rich and lean cycles when in closed-loop fuel operation. The degree of rich or lean of the system is proportional to the time period difference. An adaptive learning control correction factor is incremented or decremented by an adaptive amount proportional to the time period difference.