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. 09, 1999
Filed:
Dec. 02, 1998
Katsuhiko Toyoda, Shizuoka-ken, JP;
Suzuki Motor Corporation, Shizuoka-ken, JP;
Abstract
An air-fuel ratio controlling apparatus for an internal combustion engine allows an air-fuel ratio learning control to be executed to a satisfactory extent during manufacture in a factory to thereby stabilize exhaust gases and driving performance. The apparatus is provided with a controller which sets air-fuel ratio learning execution counters in a plurality of learning zones. The counters judge whether an air-fuel ratio learning has been executed in an air-fuel ratio learning value storage map based on engine revolutions and engine load, and execute a forced learning control with the amount of purge as a fixed value where the air-fuel ratio learning is not performed at least a preset number of times in all the learning zones with the air-fuel ratio learning execution counters set therein.