关键词: 行驶阻力系数；插值；计算方法；循环能量需求；传动系阻力；行驶阻力系族

Abstract: The driving resistance coefficient is a key input for the simulation of automotive performance and economy, engine matching, and fuel consumption emission testing. It runs through the entire process of automotive development. In order to accurately obtain the driving resistance coefficient before the actual vehicle coasting test, this article analyzes the motion model of the vehicle during coasting motion, establishes the relationship between the driving resistance coefficient and the tyre rolling resistance, transmission system resistance and air resistance. Combined with the existing test data of mass production vehicle, a method is proposed to establish a driving resistance family based on the transmission type, interpolate and calculate the driving resistance coefficient of newly developed vehicle models, and meet the requirements of vehicle development for driving resistance coefficient before actual vehicle coasting. After mass production of the actual vehicle, coasting test is conducted in the testing field, and the test results verified the effectiveness of the method.

Key words: driving resistance coefficient; interpolation; calculation method; cyclic energy demand;transmission system resistance; driving resistance family