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:
Jul. 14, 1998
Filed:
Jan. 24, 1997
Akira Uchikawa, Omama, JP;
Unisia Jecs Corporation, Atsugi, JP;
Abstract
In an internal combustion engine equipped with electronically controlled fuel injection valves, there is provided an air-fuel ratio detecting system. The system comprises a wide range type air-fuel ratio sensor disposed in an exhaust pipe of the engine. The sensor issues an output voltage that varies continuously in accordance with an exhaust gas air-fuel ratio possessed by an exhaust gas in the exhaust pipe. The output voltage of the sensor is translated to an air-fuel ratio of air-fuel mixture with reference to a reference table. A variation characteristic of the output voltage of the sensor is decided relative to variation of the air-fuel ratio of air-fuel mixture. A correction data of the translated air-fuel ratio is formed with reference to the variation characteristic. The translated air-fuel ration is corrected with reference to the correction data.