Abstract: The optimal matching of automotive powertrain is an important part of automotive design． The experimental data of engine universal characteristics is very important in the motor fuel economy field． Using the experimental data of universal characteristics，the minimum fuel consumption，the mean fuel consumption and the mean-square fuel consumption were obtained， and the comprehensive evaluation standard of engine fuel economy was also established． Through the minimum ratio of transmission，the fast calculation method of optimal matching was obtained． The validity of fast calculation method was verified by testing and computing．

Key words: vehicle design, optimization matching, comprehensive evaluation standard

摘要： 汽车动力传动系的优选匹配是汽车设计的重要组成部分。发动机的万有特性实验数据是汽车经济性计算的 重要参数，利用发动机的万有特性实验数据，得到发动机的最低燃油消耗率、平均燃油消耗率、燃油消耗率均差，建 立了发动机经济性的综合评价标准; 通过处理传动系的最小传动比，得到了优选匹配快速计算方法; 实例计算验证 了优选匹配快速计算方法的有效性。

关键词: 汽车设计, 优选匹配, 综合评价标准