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从二冲程与四冲程发动机的对比就可以看出,二冲程机质量轻、体积小、结构简单、维修方便、体积功率大,但充气效率差,有浓的燃油与润滑油混合比,较大的扫气损失,较高的燃油油耗及碳氢化合物排放以及由于二冲程润滑油随同燃油一起直接参与燃烧造成的较大的排烟。 对HC的排放影响,不仅包括汽油在润滑油膜和燃烧室沉积物多孔结构中吸附和解吸作用,即在排气冲程中汽油被解吸出来又排到大气中去。对于二冲程摩托车还包括润滑油的燃烧问题,即润滑油
From the two-stroke and four-stroke engine comparison we can see that the two-stroke light weight, small size, simple structure, easy maintenance, large volume power, but the inflatable efficiency is poor, there is a strong mixture of fuel and lubricating oil, larger Scavenging losses, higher fuel consumption and hydrocarbon emissions, and larger fumes from two-stroke lubricants that are directly involved in combustion along with fuel. The impact on HC emissions includes not only the adsorption and desorption of gasoline in the porous structure of the lubricant film and combustion chamber deposits, that is, the gasoline is desorbed and vented to the atmosphere during the exhaust stroke. For two-stroke motorcycles also include the burning of lubricating oil, that is, lubricating oil