对某增压汽油发动机曲轴箱通风系统原理进行了阐述，进行了漏气流量、新鲜空气补充量、机油携带量、机油消耗试验。概括性地介绍了台架测量油气分离器机油携带量的方法，测量了在不同漏气流量、油气分离器精分离小孔数量下油气分离器的机油携带量水平差异。同时，在油气分离器机油携带量试验过程中发现，油气分离器精分离回油通道上回油单向阀的反向截止功能是否可靠将直接影响油气分离器机油携带量试验的成败。油气分离器机油携带量试验结果表明，匹配所设计的油气分离器，在单双倍活塞漏气流量情况下，油气分离器的机油携带量水平满足设计目标要求。当油气分离器精分离小孔数量为4时，油气分离器具有更优的机油携带量水平。

he principle of crankcase ventilation system for a turbocharged gasoline engine was expounded. The blow-by flow, fresh air supplement, oil carry-over amount, and oil consumption tests were conducted. The bench measuring method of oil carry-over amount for oil-gas separator was generally introduced and the oil carry-over amount difference was measured under different blowby flows and numbers of oil-gas separator fine separation hole. It was found that during the process of experiment whether the reverse cut-off function of oil return check valve on the oil return channel of oil-gas separator was reliable or not would directly affect the test result. The test results show that the oil carry-over amount of the designed oil-gas separator can meet the design requirements under the condition of single or double blow-by flow. And the overall oil carry-over amount achieves a high level when the number of fine separation hole is 4.