Method of air-fuel ratio control of internal combustion engines of automobiles

摘要

A method of air-fuel ratio control for automotive internal combustion engine in which the amount of fuel to be supplied to the internal combustion engine is determined in accordance with the amount of air passing through a main air intake path, and the amount of air in a bypass is controlled in a manner to attain a predetermined air-fuel ratio for a lean mixture gas which is determined by a predetermined operating mode of the automobile. The amount of supplied fuel which changes with the amount of air in the bypass is thus corrected to perform the lean mixture gas operation in the predetermined operating mode.