| 摘要 |
PURPOSE:To prevent the occurrence of mismaking in an air-fuel ratio compensation value based on engine speed variations as well as to aim at improvement in air-fuel ratio control, by releasing the making of the air-fuel ratio compensation value in time of detecting a speed unstable element at idling. CONSTITUTION:In time of engine operation, a fuel injection quantity is calculated at a control device 20 of a control unit 7 on the basis of each output of a speed variation detecting device 19 receiving each output of a suction pressure sensor 14 and a speed sensor 12, and a fuel injection nozzle 6 is controlled via an air-fuel ratio changing device 18 whereby an air-fuel ratio is kept on the desired value. Furthermore, in the control unit 7, there is provided with a speed unstable element detecting device 21 receiving each output signal out of an idle switch 13, a starter switch 15, a water temperature switch 16 and an accessories switch 17 or the like. In addition, in time of detecting a speed unstable element, the making of an air-fuel ratio compensation value to be conducted in time of idling operation is stopped whereby mismaking in the air-fuel compensation value is prevented from occurring before it happens.
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