小型二冲程汽油发动机,有着结构简单,制造成本低等优点,但它的燃料消耗量较大。不仅有大量未燃烧的CH排出造成浪费,排出的气体也要造成污染。因此在低速运行时,很难得到稳定的燃烧特性。要想彻底改善这些缺点,目前所采用的结构是不行的。首先应从排气孔关闭燃料进 Small two-stroke gasoline engine has the advantages of simple structure, low manufacturing cost, but its fuel consumption is larger. Not only is there a large amount of unburned CH that causes waste, the discharged gas also causes pollution. Therefore, it is difficult to obtain stable combustion characteristics at low speed. To completely improve these shortcomings, the current structure is not acceptable. First of all, the fuel should be shut off from the vent