| 摘要 |
An air-fuel ratio control apparatus for controlling an air-fuel ratio of a supplied air-fuel mixture of an internal combustion engine to a target air-fuel ratio by a feedback control in accordance with an output signal of an oxygen concentration sensor provided at an exhaust pipe of the internal combustion engine, in which a perturbation control for vibrating the air-fuel ratio periodically to a rich side and a lean side centering on the target air-fuel ratio is executed in accordance with the output signal of the oxygen concentration sensor in a predetermined high load and high rotation operating state of the internal combustion engine.
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