| 摘要 |
PURPOSE:To enhance the supercharging effect through utilization of interference between cylinders and natural pulsation of intake air in the intake system, by providing a surge tank separated into two expansion chambers in an intake passage of a two- cylinder rotary piston engine having two independent intake passage systems. CONSTITUTION:At the time of high-load, high-speed operation of an engine, a first and a second high-load intake passages 21a, 21b are opened through opening of a high-load throttle valve 23, and intake air supplied independently from high- load intake ports 4 and low-load intake ports 3. In this state, if the intake port 4, for instance, of a second cylinder 1B is opened, intake air is compressed by the pressure of residual exhaust gas, and the compression wave is transmitted to the intake port 4 of a first cylinder 1A via the intake passage 21b, a second expansion chamber 28 and the intake passage 21a just before the intake port 4 of the first cylinder 1A is closed completely, so that the intake air is supercharged. On the other hand, since the compression wave produced when the intake port 4 of the second cylinder 1B is closed at the end of suction stroke is transmitted to the intake port 4 of the first cylinder 1A at the end stage of suction stroke via the same passages, the intake air is also supercharged.
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