The latest electric vehicles (EVs) have advanced thermal management systems to regulate heat distribution across the vehicle, thereby improving the driving range. the author thinks that a key factor, which is influencing thermal performance during driving, is the effect of the driving-wind. However, EVs performance is evaluated by using a chassis dynamometer (CHDY), where it remains unclear whether the driving-wind specifications, which defined in the Worldwide Harmonized Light Vehicles Test Procedure (WLTP), adequately replicate real-world conditions.
This study investigates both internal combustion engine vehicles and several electrical vehicles to estimate the potential discrepancies in WLTP’s driving wind requirements. Specifically, the author modified the CHDY vehicle-cooling fan to more accurately simulate wind speed at the front and underside of the vehicle under real-world driving conditions, which drove at outside road. The author analyzed the impact of these modifications, and future considerations for refining the driving-wind at CHDY testing were discussed.