Influence on Electric Vehicle Performance by Reproduced Real-world Driving Wind on Chassis Dynamometer

The latest electric vehicles (EVs) incorporate advanced thermal management systems to regulate heat distribution throughout the vehicle, thereby improving driving range. A key factor influencing thermal performance is the effect of driving wind during motion. However, evaluations of EV performance are often conducted using a chassis dynamometer (CHDY), where it remains unclear whether the driving wind specifications defined in the current Worldwide Harmonized Light Vehicles Test Procedure (WLTP) framework adequately replicate real-world conditions. This study investigates the vehicle performance of both internal combustion engine vehicles and EVs to verify the wind requirements of the WLTP. Specifically, we simulated the wind speed at the front and underside of the vehicle under real-world driving conditions, and modified the vehicle-cooling fan of the CHDY. We analyzed the impact of these modifications, and we discussed the future considerations for refining the driving wind simulation in vehicle testing.