| 摘要 |
PURPOSE:To both increase control accuracy of air-fuel ratio and improve operation durability of solenoid valves, by changing a driving frequency of the respective solenoid valve for auxiliary air bleed correspondingly to a fuel flow amount in slow and main lines. CONSTITUTION:To change a driving frequency of main and slow solenoid valves 16 and 17 in accordance with proportion of a fuel share in main and slow lines, a load detecting means 21 and speed detecting means 23 are provided. From these detecting values, a control unit 25 reads to feed a solenoid valve driving frequency, previously determined on the basis of a previously stored proportion of fuel share, to the solenoid valves 16, 17. That is, the slow or main line driving frequency is set higher respectively for the higher proportion of fuel share in the slow or main lines, in this way, pulsation width of air-fuel ratio can be reduced and a response can be improved. |
