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:
Aug. 08, 1989
Filed:
Apr. 08, 1988
Akira Uchikawa, Isesaki, JP;
Japan Electronic Control Systems Co., Gunma, JP;
Abstract
An air-fuel ratio control apparatus in an internal combustion engine with air-fuel ratio feedback control means comprises first air-fuel ratio sensor which senses the air-fuel ratio of the air-fuel mixture having a first level of the theoretical air-fuel ratio or leaner than the theoretical air-fuel ratio and second air-fuel ratio sensor which senses the air-fuel ratio of the air-fuel mixture having second level of the air-fuel ratio richer than the first air-fuel ratio. In a region where the amount of NO.sub.x generated is small, the first air-fuel feed back control is performed based on the detection by the first air-fuel ratio sensor, while in a region where the amount of NO.sub.x generated is large, the second air-fuel feedback control is performed based on the detection by the second air-fuel ratio sensor, whereby the amount of NO.sub.x is reduced without using an EGR control system.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile