Abstract: The road load (wind tunnel method) in Limits and Measurement Methods for Emissions from Light-duty Vehicles (China 6) (GB18352.6–2016) is obtained by separately measuring the aerodynamic resistance and rolling resistance of the entire vehicle through a wind tunnel. As an important component affecting road load, tires' wear level has a certain impact on both the aerodynamic resistance and rolling resistance of the entire vehicle. Based on the wind tunnel method, this paper simulates different levels of tire wear by grinding tires and conducts a study on the impact of tire wear on the road load of the entire vehicle. The road load test results show that after the tires are worn to a certain extent, the aerodynamic resistance of the entire vehicle changes slightly, the rolling resistance decreases, and the road load of the entire vehicle also decreases accordingly, which is basically consistent with the change trend of tire rolling resistance.This method offers high efficiency, low error, and results closer to real-world conditions, being unaffected by coasting environment interference on actual roads. It can provide valuable data support and insights for subsequent analysis of maximizing range and energy consumption in new energy vehicles.

Key words: aerodynamic-acoustic wind tunnel; road load (wind tunnel method); coast-down; tire wear

摘要： 国标《轻型汽车污染物排放限值及测量方法（中国第六阶段）》（GB18352.6－2016）中 道路载荷（风洞法）通过风洞对整车的空气动力学阻力和滚阻分别测量后，可以得到整车的 道路载荷。轮胎作为影响道路载荷的重要部件，其磨损程度对整车的空气动力学阻力和滚阻 都存在一定影响。文章基于风洞法，通过对轮胎打磨模拟轮胎不同程度的磨损，开展轮胎磨 损对整车道路载荷影响的研究。道路载荷测试结果表明，轮胎在一定程度的磨损后，整车空 气动力学阻力变化较小，滚阻减小，整车道路载荷也随之减小，与轮胎滚阻变化趋势基本一 致。该方法效率高、误差小、更接近真实路况，不受道路滑行环境干扰，可为后续新能源车 辆的极致续航和能耗分析提供一定数据支撑和说明。

关键词: 气动声学风洞；道路载荷（风洞法）；道路滑行；轮胎磨损