某款甲醇增压发动机曲轴箱通风系统压力波动分析及优化设计  

Analysis and Optimization Design of Pressure Fluctuation in the Crankcase Ventilation System of a Turbocharged Methanol Engine

作　　者：张元东 马学建 赵俊鑫 马瑞博 袁爽 ZHANG Yuandong;MA Xuejian;ZHAO Junxin;MA Ruibo;YUAN Shuang(Ningbo Geely Royal Engine Components Co.,Ltd.,Ningbo 315336,China)

机构地区：[1]宁波吉利罗佑发动机零部件有限公司,浙江宁波315336

出　　处：《内燃机》2025年第1期59-62,共4页Internal Combustion Engines

摘　　要：根据吉利动力未来发动机规划,需要开发一款增压直喷甲醇燃料发动机,以满足商用车的应用需求。考虑到开发周期及通用化率,部分零部件将借用已量产的零部件。在前期热力学开发试验过程中,发动机出现了低扭矩工况下曲轴箱压力波动。经过对工况点的数据分析,发现曲轴箱压力波动与油气分离器压力调节阀(PRV阀)及通气阀总成的气体流量存在关联性。试验验证确认PRV阀的性能以及通气阀的孔径大小与进气量数据不匹配,这是导致曲轴箱压力波动的原因。最终,通过调整PRV阀的弹簧参数以及通气阀的孔径大小,成功地解决了曲轴箱压力波动的问题。According to Geely Powers future engine planning,a turbocharged direct injection methanol fuel engine needs to be developed to meet the needs of commercial vehicles.Considering the development cycle and generalization rate,some parts will be borrowed from mass-produced parts.However,during the early stage of thermodynamic development tests,a problem of pressure fluctuations in the crankcase under low torque conditions emerged.Through data analysis of the operating points,it was found that there was a correlation between the pressure fluctuation of the crankcase and the gas flow of the pressure regulating valve PRV valve and the breather valve assembly of the oil-gas separator.Through experimental verification,it was confirmed that the performance of the PRV valve and the size of the vent valve bore did not match the intake air flow data,which was the cause of the pressure fluctuations in the crankcase.Finally,by adjusting the spring parameters of the PRV valve and the size of the vent valve,the problem of pressure fluctuations in the crankcase was successfully solved.

关 键 词：甲醇发动机 油气分离器 曲轴箱压力 PRV阀 

分 类 号：U464[机械工程—车辆工程]