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本文通过碳氢在缸套壁面润滑油膜中的扩散模型，研究了油膜对未燃碳氢排放的影响，并开展了相应的试验研究。计算结果表明随着润滑油膜厚度的增加，它对燃油碳氢的吸收或释放量也增加，直至某一临界厚度时达到最大，之后，将保持这一最大值。实际发动机缸套壁面有足够厚的油膜，使其对碳氢的吸收或释放量达到并保持这种最大值。试验结果进一步说明了这一点，且由油膜所致的未燃碳氢排放约占总排放的２８％。
In this paper, the influence of oil film on the unburned hydrocarbon emissions was studied by the diffusion model of hydrocarbon in the lubricating oil film on the wall of cylinder liner, and the corresponding experimental research was carried out. The calculated results show that as the lubricant film thickness increases, its absorption or release of fuel hydrocarbon also increases, reaching a maximum at a certain critical thickness, after which the maximum value will be maintained. The actual engine cylinder liner wall thick enough film, so that its absorption or release of hydrocarbons to achieve and maintain this maximum. The test results further illustrate this point, and the unburned hydrocarbon emissions caused by the oil film account for about 28% of the total emissions.