| 摘要 |
An air-fuel ratio control device including an O2 sensor arranged in the exhaust passage downstream of a three-way catalyst. In the lean air-fuel ratio operating state such as at a fuel cut, when a large amount of oxygen is introduced to the three-way catalyst, air-fuel ratio feedback control by the O2 sensor output is stopped. Next, after the end of the lean air-fuel ratio operating state, the resumption of the air-fuel ratio feedback control by the O2 sensor output is delayed for a predetermined time T and, during the delay period, the air-fuel ratio upstream of the catalyst is made rich.
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