| 摘要 |
PURPOSE:To reduce the extent of blow-by of a fuel constituent by setting the valve opening timing of an intake valve at the side of feeding intake air small in the fuel constituent among plural intake valves installed in a suction passage to be interconnected to a combustion chamber to be earlier than that of other intake valves. CONSTITUTION:An engine has a lot of combustion chambers, and, a suction passage 5 and an exhaust passage 6 are connected to each combustion chamber 2 via plural pieces of intake valves 3 and an exhaust valves 4. In this case, the suction passage 5 is branched off each by two pieces to each combustion chamber 2 at the downstream side of a throttle valve 9. And, a fuel feeding device 8 is installed in one side 5d alone at the side small in an overlap, while only air is fed to the other side 5e. At the end of an exhaust stroke, first the intake valves 3 at the side of feeding the intake air small in a fuel constituent is opened, thereby feeding the inside of each combustion chamber 2 with air or lean mixture. Consequently, the extent of blow-by of the fuel constituent is reducible irrespective of fresh air blow-by.
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