| 摘要 |
PURPOSE:To prevent rough idling by providing the auxiliary introduction port of a blow-by gas on a site on a slightly upper course side of the closed position of a throttle valve. CONSTITUTION:A blow-by gas passage 11 is connected to a blow-by gas introduc tion port 13 provided on the lower source side of a throttle valve 9. A blow-by gas auxiliary introduction port 14 is provided on a site on the slightly upper course side of the closed position of the throttle valve 9 while being connected to the blow-by gas passage 11. At the time of idling, since the auxiliary introduc tion port 14 is positioned on the upper course side of the throttle valve 9 or being closed by the throttle valve 9, the introducing quantity of the blow-by gas is restricted to be a proper quantity. Thereby, the occurrence of rough idling can be prevented. |
