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:
May. 06, 1997
Filed:
Feb. 05, 1996
Tadahiro Azuma, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An air-fuel ratio control apparatus for an internal combustion engine includes an operative state detection unit for detecting an operative state of the internal combustion engine, a purge quantity calculation unit for calculating a quantity of purge air and a purge rate calculation unit for calculating a purge rate from the purge air quantity calculated by the purge quantity calculation unit and from the operative state detected by the operative state detection unit. A purge air concentration calculation unit calaulates a purge air concentration from the purge rate and the air-fuel ratio feedback correction coefficient. A purge air concentration correction unit calculates a purge air concentration correction coefficient based on the purge rate and the purge air concentration, and a fuel injection quantity calculation unit calculates an injection quantity of fuel, based on the air-fuel ratio feedback correction coefficient and the purge air concentration correction coefficient.