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:
Jun. 25, 1996
Filed:
Dec. 12, 1994
Kenichi Ono, Kariya, JP;
Nippondenso Co., Ltd., Aichi-Pref., JP;
Abstract
An air-fuel ratio control system for an internal combustion engine is provided. This system has an upstream air-fuel ratio sensor arranged upstream of a catalytic converter and a downstream air-fuel ratio sensor arranged downstream thereof, and learns a given feedback control parameter upon reversal of an air-fuel ratio between rich and lean sides based on the downstream air-fuel ratio sensor. The system also learns the given feedback control parameter when preselected conditions are met even if the air-fuel ratio is not reversed. Additionally, the system, when brought under open-loop control from feedback control, stores the given control parameter. Upon resumption of the feedback control, when the air-fuel ratio shows the same status, the stored given control parameter is used. Further, the system controls the air-fuel ratio based on the output from the downstream air-fuel ratio sensor when it moves out of a preselected range.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile