| 摘要 |
PURPOSE:To prevent increased emission of a harmful components such as CO, by stopping the skip of a corrected air-fuel ratio at accelerating to a set value when the corrected air-fuel ratio is greater than the set value and an O2 sensor repeatedly outputs a rich signal and a lean signal. CONSTITUTION:During the operation of an engine 6, a control unit 1 determined whether or not an O2 sensor 7 continuously outputs a rich signal. If the determination is YES, and the control unit 1 determines according to a signal from a throttle switch 4 that the engine 6 is at accelerating, a predetermined value is skipped to a lean side, and thereafter an air-fuel ratio control is carried out by the O2 sensor 7. When the O2 sensor 7 repeatedly outputs a rich signal and a lean signal, and a corrected air-fuel ratio at accelerating is not greater than a set value, the corrected air-fuel ratio is skipped to the set value. Reversely, when the corrected air-fuel ratio is greater than the set value, the skip is stopped, and the air-fuel ratio control is carried out by the O2 sensor 7.
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