车辆动力传动系建模与整车性能仿真

Mathematical Modeling for Vehicle Power Train and Simulation for Vehicle Performance

动力传动系性能是影响车辆动力性和燃油经济性的重要因素,而发动机数学模型是整车性能模拟计算的重要依据。文中采用最小二乘拟合法获取发动机外特性的转速一元函数,运用曲面拟合法获取基于发动机转速和转矩的二元函数万有特性模型,运用Matlab建立整车动力性与燃油经济性计算机仿真平台。数值仿真计算和道路试验结果对比表明,计算方法及仿真平台设计是正确的,模拟计算值有效、可靠。

Power train is an important factor affecting vehicle performance and fuel economy, and the mathematical model of engine and vehicle performance is an important basis for computer simulation. In this paper, least-square fitting was used to obtain engine speed characteristics function. An engine speed and torque characteristics dual function model was got by adopting surface fitting. Finally, a vehicle computer simulation platform was developed based on Matlab. The digital simulation platform and vehicle road test results show that the calculation method and the simulation platform design is correct, and the simulation calculation is effective and reliable.