由于二冲程发动机存在着排气污染问题,因此美国和其它一些发达国家已严令禁用。然而,二冲程发动机,特别是小排量机存着固有的优点,为此人们并未完全将其抛弃,而在做着扬长避短的工作,竭力开发出排气净化效果好的新产品。 对于二种程发动机来说,最关键的是解决排气不含油的问题,即实现排气净化,直到排气门闭合后才喷入燃料。做到这一点二冲程发动机就能充分发挥其固有的优势——高比功率。 Because of the exhaust pollution problems of two-stroke engines, the United States and some other developed countries have already strictly banned it. However, two-stroke engines, especially small-displacement engines, have inherent advantages. For this reason, people have not completely abandoned them, and are doing their best to avoid weaknesses and strive to develop new products with good exhaust gas purification effects. For two engines, the key is to solve the problem of exhaust gas without oil, that is, to achieve exhaust purification, until the exhaust valve is closed after the injection of fuel. To do this two-stroke engine can give full play to its inherent advantages - high specific power.