| 摘要 |
PURPOSE:To scavenge residual gas so as to improve the output of engines by feeding a mixture at low speed only from NO.1 scavenge passage for improving self-ignition capability in an operating area where an engine load can be increased upto a predetermined load, and by feeding supercharged air at high speed from NO.2 scavenge passage in an operating area where the engine load is identical to the predetermined load or more. CONSTITUTION:In an operating area where an engine load is identical to a predetermined load or more, the supercharging of air is effected by a compressor 20a of an exhaust superchanger 20, besides, supercharged air, a flow rate of which is controlled by NO.2 throttle valve 42 of NO.2 induction system B, is flowed into a combustion chamber 6 directly at high speed from NO.2 scavenge passage 40 via a check valve 43 for scavenging residual exhaust gas quickly from an exhaust port 18. Then a mixture from NO.1 induction system A, which has passed an intake air passage 12, a crank room 8, and NO.1 scavenge passage 30, is flowed into the combustion chamber 6 at low speed to the exhaust port 18. This constitution can improve the self-ignition capability in an operating area where the engine load is less than the predetermined load, and also can achieve the improvement of engine outputs in high engine loading areas.
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