| 摘要 |
PURPOSE:To reduce fuel consumption and improve stability of an engine in low load by providing a sub-fuel injection valve driven in the low load in an auxiliary intake path. CONSTITUTION:Fuel is supplied mainly from a main fuel injection valve 12 and a sub-fuel injection valve 17 is driven in low load including idling time. Air passes through a slight gap between a throttle valve 13 and the inner wall of an intake path 15 with speed near acoustic velocity in the idling time. Thus, fuel supplied to an auxiliary intake path 16 from the sub-fuel injection valve 17 is sucked out of the opening end 16b of said path 16 and atomized very satisfactorily by the high speed air flow. Also, in the low load where the throttle valve 13 is slightly opened, a comparatively large intake negative pressure acts on the opening end 16b of the auxiliary air path 16 to provide similarly satisfactory atomization. |
