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:
Feb. 04, 2003
Filed:
Nov. 17, 2000
Norio Matsumoto, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A device for controlling the air-fuel ratio of an internal combustion engine, which is capable of highly precisely finding learning correction values in an open-loop operation region by using an ordinary air-fuel ratio sensor. The device comprises means for correcting the amount of fuel depending upon a target air-fuel ratio AFo, means for determining the conditions CF for controlling the air-fuel ratio feedback of the internal combustion engine depending upon the operation conditions, means for controlling the air-fuel ratio feedback in the feedback operation region, and means for finding learning correction values Zs for every operation region based on the control quantity AFc of the feedback control means, wherein the feedback control operation is executed in the open-loop operation region, and the learning correction values in the open-loop operation region are found during the feedback control operation that lasts only temporarily.