关键词: 气动声学风洞；道路载荷（风洞法）；道路滑行；轮胎磨损

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