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

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