改进发动机的目标,在于使发动机能在广泛的工作范围内获得最大的输出功率,在达到这一目标的同时,还要使其在排放、燃油经济性、安装布置、成本以及操纵性能等方面达到要求.近来,涡轮增压器已成为提高小型发动机功率的有效方法,同时可提高燃油经济性,并基本上保持安装布置方便的优点.近来,采用机械增压器的研究也在积极地进行中.与涡轮增压器相比,机械增压器可改善发动机低速时的扭矩响应性.然而,由于机械增压器噪声较大,并且不能长时间高速运转, The goal of improving the engine is to achieve the maximum output power of the engine over a wide range of operating conditions, while achieving this goal in terms of emissions, fuel economy, installation layout, cost and maneuverability Recently, turbochargers have become an effective way to increase the power of small engines, while at the same time improving fuel economy and basically maintaining the advantages of easy installation and installation.Recently, the research on the use of superchargers is also actively underway Compared with the turbocharger, the supercharger can improve the torque response of the engine at low speed.However, because the supercharger noise is large, and can not run at high speed for a long time,