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. 12, 1987
Filed:
Mar. 07, 1986
Yuji Takeda, Toyota, JP;
Toshio Suematsu, Toyota, JP;
Osamu Harada, Toyota, JP;
Katsushi Anzai, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Abstract
An apparatus of controlling an air-fuel ratio for internal combustion engine, further comprising the steps of calculating a basic fuel injection duration based on an engine load and a rotational speed of the engine, obtaining a factor of air-fuel ratio feedback correction for allowing a fuel injection duration to perform a proportional-plus-integral action, based on an output of an oxygen sensor for detecting an residual oxygen concentration in an exhaust gas, calculating a mean value of said factor of air-fuel ratio feedback correction, varying a correction value by learning so that said mean value takes a value within a predetermined range centered at a predetermined value corresponding to a target air-fuel ratio, multiplying said mean value by said correction value, providing initial adjustment of load detection apparatus applied to said internal combustion engine for determining said basic fuel injection time duration in order to set said calculation result within said predetermined range, and obtaining the fuel injection duration based on said basic fuel injection duration, said factor of air-fuel ratio feedback correction and said correction value, thereby, to control the air-fuel ratio.