汽车动力性计算机仿真

建立汽车动力性数学模型,由此推导出汽车动力性参数灵敏度公式,并开发出汽车动力性计算仿真程序.以东风EQ140型汽车为例进行仿真计算,仿真结果与其使用参数较为吻合.仿真计算得到空载时汽车的最高车速91km/h,与东风EQ140的使用参数最高车速90km/h(单车)相比,误差为 1.1%;满挂时汽车最高车速为72km/h,与东风EQ140的使用参数满载、满挂时最高车速为70～75km/h一致.同时对其参数灵敏度进行了分析,各参数对汽车动力性的影响以传动系的机械效率和汽车的总质量最为显著,滚动阻力系数、空气阻力系数与迎风面积的影响则小一些.

Computer Simulation of Automobile Power Performance

A mathematical model of automobile power performance was established. Based on the power performance mathematics models, the parameter sensitivity formulae of power performance were derived and the computer simulation program of automobile power performance was compiled. The simulator calculated the power performance of a EQ140 type of automobile. The simulation result coincides with that was obtained from the real automobile. Simulation result of no-load maximum speed is 91km/h and use parameter of EQ140 no-load maximum speed is 90 km/h. Error of maximum speed is 1.1%. Simulation result of full-load maximum speed is 72 km/h and use parameter of EQ140 full-load maximum speed is from 70 km/h to 75 km/h. Parameter sensitivity was analyzed. Automobile power performance was influenced by a variety of parameters and mechanical efficiency and total quality of automobile are obvious ones. The rolling resistance coefficient, air resistance coefficient and frontal area have less influence.