Apparatus for and method of controlling air-fuel ratio of engine

摘要

A technique of controlling an air-fuel ration for an engine, in which an air-fuel ratio feedback correction coefficient alpha to correct an amount of fuel injection into the engine is computed based on an output from an air-fuel ratio sensor disposed on an upstream side of a catalytic converter. A gain of the air-fuel ratio feedback correction coefficient alpha in respect to a detection result of the air-fuel ratio sensor is decreased as a delay in a transient response of the air-fuel ratio sensor occurs. Thus, an excessive increase in the amount of fuel injection immediately after fuel cuts is prevented.