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Title: Method of air/fuel ratio control for internal combustion engine

Abstract

This patent describes a method of air/fuel ratio control for a multi-cylinder internal combustion engine provided with at least one oxygen concentration sensor mounted within an exhaust system of the internal combustion engine for producing an output which varies substantially in proportion to an oxygen concentration in exhaust gas from the engine, the method comprising: setting a basic value for airfuel ratio control, in accordance with a plurality of engine operating parameters relating to engine load; detecting the air/fuel ratio of a mixture supplied to the engine, based upon the output from the oxygen concentration sensor; compensating the basic value by at least an air/fuel ratio feedback compensation value which is derived in accordance with a deviation from a target air/fuel ratio of an air/fuel ratio detected utilizing the output from the oxygen concentration sensor and by a learning control compensation value representing a secular change of an air/fuel ratio control system. The improvement comprises: detecting a predetermined operating condition of the engine in which variations of the detected air/fuel ratio are small and, computing the updating respective individual values of the learning control compensation value for the respective cylinders of the engine.

Inventors:
; ; ;
Publication Date:
OSTI Identifier:
6526348
Patent Number(s):
US 4766870
Assignee:
Honda Giken Kogyo Kabushiki Kaisha, Tokyo
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 29 Apr 1987
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; FUEL INJECTION SYSTEMS; CONTROL SYSTEMS; INTERNAL COMBUSTION ENGINES; CONTROL; DETECTION; FUEL-AIR RATIO; METERING; OXYGEN ENRICHMENT; ENGINES; ENRICHMENT; FUEL SYSTEMS; HEAT ENGINES; 330100* - Internal Combustion Engines

Citation Formats

Nakajima, T, Okada, Y, Mieno, T, and Oono, N. Method of air/fuel ratio control for internal combustion engine. United States: N. p., 1988. Web.
Nakajima, T, Okada, Y, Mieno, T, & Oono, N. Method of air/fuel ratio control for internal combustion engine. United States.
Nakajima, T, Okada, Y, Mieno, T, and Oono, N. Tue . "Method of air/fuel ratio control for internal combustion engine". United States.
@article{osti_6526348,
title = {Method of air/fuel ratio control for internal combustion engine},
author = {Nakajima, T and Okada, Y and Mieno, T and Oono, N},
abstractNote = {This patent describes a method of air/fuel ratio control for a multi-cylinder internal combustion engine provided with at least one oxygen concentration sensor mounted within an exhaust system of the internal combustion engine for producing an output which varies substantially in proportion to an oxygen concentration in exhaust gas from the engine, the method comprising: setting a basic value for airfuel ratio control, in accordance with a plurality of engine operating parameters relating to engine load; detecting the air/fuel ratio of a mixture supplied to the engine, based upon the output from the oxygen concentration sensor; compensating the basic value by at least an air/fuel ratio feedback compensation value which is derived in accordance with a deviation from a target air/fuel ratio of an air/fuel ratio detected utilizing the output from the oxygen concentration sensor and by a learning control compensation value representing a secular change of an air/fuel ratio control system. The improvement comprises: detecting a predetermined operating condition of the engine in which variations of the detected air/fuel ratio are small and, computing the updating respective individual values of the learning control compensation value for the respective cylinders of the engine.},
doi = {},
url = {https://www.osti.gov/biblio/6526348}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {8}
}