| 摘要 |
PURPOSE:To prevent an air cleaner element and a throttle valve from contamination and to prevent effectively an EGR passage from being clogged, by suppressing the flow of an excess amount of a blow-by gas through a by-pass system even if an engine is under high load. CONSTITUTION:The main system passage 6 for reducing the blow-by gas led from the crank case section of an engine 1 is connected with a part of intake ports 4 adjacent to an engine suction port. A by-pass passage 8 is connected to a part positioned upstream of the throttle valve 5 of a throttle body 2. As the main system passage 6 is connected to the section of the intake ports 4 of the suction systems to which the engine suction negative pressure acts most, if, for example, the negative pressure of the suction system is lowered when the engine is under full load, the flow rate of the blow-by gas for reducing can be fully secured. |
