| 摘要 |
PURPOSE:To completely scavenge exhaust gas in an engine, by closing a sub- intake passage with an intake shut-off valve, interposing an air supply device in the intake shut-off valve and jetting air for a specific period in an exhaust stroke of the engine. CONSTITUTION:A closing valve 22 is provided in a prescribed position of a main intake passage 6, communicated to a working chamber 4 of a rotary piston engine, and an intake shut-off valve 18 is provided in a prescribed position of a sub-intake passage 17. At about the conversion point transferred from an exhaust stroke to an intake stroke, intake air, forcibly fed from a pump 12, is jetted through the intake shut-off valve 18 to scavenge residual gas in the working chamber 4. In this way, fuel consumption of the engine can be improved. |
