AIR-FUEL RATIO CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

摘要

An air-fuel ratio control device of an internal combustion engine controlling the air-fuel ratio of air/fuel mixture supplied to the internal combustion engine by the feedback thereof toward a target air-fuel ratio according to output signals from an oxygen concentration sensor installed in the exhaust pipe of the internal combustion engine. When the internal combustion engine is operated at a specified high speed under a specified high load, a perturbation control in which the air-fuel ratio is cyclically oscillated between the rich side and the lean side with respect to the target air-fuel ratio according to the output signals from the oxygen concentration sensor.