【摘要】 随着我国对城市大气污染的严格控制,现许多城市中的部分公交车和出租车的汽油机已改装成天然气或天然气-汽油双燃料的发动机.在发动机结构不作大改动的情况下,这种天然气发动机虽然排放的有害气体明显减少,但其动力性能下降明显.要同时解决有害气体的排放和发动机性能不能改变这两个问题,只有采用专门设计的天然气发动机.更多还原

【Abstract】 As air pollution in many cities has been brought into strict control, the gasoline engine used in bus and taxicab is being refitted into an engine using natural gas or the mixture of natural gas and gasoline (twinfuel engine). Although this refitted engine discharges harmful gas obviously less than the gasoline one, its power capabilities also drop clearly as a result of the slight changes of its structure. In the authors’ opinion, the good way to solve the problems of both discharging less harmful gas and retaining the same capabilities is to use naturalgas engine designed specially.更多还原