Abstract: This paper conducts a comparative study of simulation and testing for oil pump selection and oil pressure distribution of lubricated components in the lubrication system of a series gasoline engine. A one-dimensional simulation model is established via Flowmaster software based on a hybrid engine model. The discrepancies between simulation and test results during the application of variable displacement oil pumps are compared and analyzed. The simulation model is optimized with test data to further discuss the shift from variable displacement to fixed displacement oil pumps when developing a direct-drive engine model derived from the hybrid model, as well as the oil pressure distribution after removing partial components. The results demonstrate that the revised lubrication system simulation model of the hybrid engine achieves high consistency with test data at an oil temperature of 120 ℃. The simulated oil pressure of the direct-drive engine developed from the hybrid model matches test data well at 120 ℃, while obvious deviations exist under other oil temperature conditions. This indicates that simulation models calibrated for a specific oil temperature carry limitations. The research provides a scientific basis and practical guidance for the optimal design of gasoline engine lubrication systems.

Key words: lubrication system of gasoline engine; oil pump selection; simulation and test; model optimization; oil pressure distribution

摘要： 文章研究某系列汽油机润滑系统中机油泵选型及各用油部件油压分布的仿真与试验对 比。以混动机型为基础，采用 Flowmaster 软件构建一维仿真模型，对比分析变排量机油泵应 用中的仿真与试验差异，并基于试验数据优化仿真模型进一步探讨在该混动机型的基础上开 发直驱机型时，机油泵从变排量到定排量的选型转变以及取消部分部件后的油压分布情况。 结果表明，修正后的混动机型润滑系统仿真模型在高油温 120 ℃下与试验结果高度一致，基 于混动机型开发的直驱机型在 120 ℃油温下仿真与试验油压数据吻合良好，但在其他油温下 存在较大偏差，表明基于特定油温修正的仿真模型具有局限性。该研究为汽油机润滑系统的 优化设计提供了科学依据和实践指导。

关键词: 汽油机润滑系统；机油泵选型；仿真与试验；模型优化；油压分布