| 摘要 |
PURPOSE:To prevent the erroneous control of a feedback control system by suspending the air-fuel ratio feedback control during the correction of accelerating fuel increase on the basis of the output of a detecting means for directly detecting the execution of the correction of the acceleration fuel increase. CONSTITUTION:Each detection signal of a negative pressure sensor 6, O2 sensor 10, throttle opening degree sensor 14, idle switch 5, etc. is input into a control unit 5, and air-fuel ratio feedback control is executed through the air bleed of a carburetor 4 under a prescribed operation condition. While, a pressure switch 12 is installed into the acceleration fuel passage of the carburetor 4, and the pressure increase in the acceleration fuel passage due to the operation of an accelerating pump is detected, and a detection signal is sent out into the control unit 5. When the execution of correction for the accelerating fuel increase is detected on the basis of the detection signal of the pressure switch 12, the control unit 5 suspends the air-fuel ratio feedback control and fixes the control signal to the average value of the control signal immediately before.
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