Electric vehicle (EV) manufacturers compete to make their vehicles go farther on one charge. This puts a spotlight on how cars and aerodynamics work together. It's not just about power; it affects the car's stability when driving and even how much noise the wind makes.
To enhance efficiency concerning next-generation EVs, Hyundai Motor Company and Kia Corporation have unveiled a technology called the 'Active Air Skirt' (AAS). The companies claim that it reduces aerodynamic resistance generated at high speeds, proving effective in enhancing EVs' driving range and stability.
By actively managing the airflow entering the bumper's lower section, AAS technology adeptly regulates turbulence around the vehicle wheels. This dynamic control varies based on the vehicle's speed, particularly during high-speed driving.
Advancing aerodynamics
As the quest for enhanced efficiency gains momentum, manufacturers are actively seeking ways to minimize the coefficient of drag (Cd). This coefficient represents the resistance exerted by the air in opposition to the vehicle's forward motion. In essence, efforts are underway to streamline the vehicles and optimize their aerodynamic performance.
AAS is discreetly positioned between a vehicle's front bumper and front wheels, remaining concealed during regular operation. However, it springs into action when speeds exceed 49 mph (80 km/h), countering increased aerodynamic resistance compared to rolling resistance.
Impressively, it retracts again at 43 mph (70 km/h), strategically avoiding frequent activation within specific speed ranges.
This deployment strategy, unique to AAS, is a deliberate choice to optimize performance. Rather than covering the entire front, it focuses on the front part of the tires.
This design aligns with the Hyundai Motor Group's E-GMP platform for electric vehicles (EVs), leveraging the flat platform floor for more effective aerodynamic enhancement. Additionally, it boosts downforce, contributing to improved vehicle traction and high-speed stability, according to a statement by the companies.
AAS exhibits versatility by functioning at speeds exceeding 124 mph (200 km/h). This capability is achieved using rubber material on the lower part, minimizing the risk of external objects causing damage during high-speed driving and ensuring long-term durability.
Enhancing efficiency
Hyundai and Kia have reported successful testing of their AAS technology in the Genesis GV60, resulting in a notable reduction in the drag coefficient (Cd) by 0.008. This achievement corresponds to a 2.8 percent improvement in drag, potentially leading to an additional range enhancement of approximately 4.9 miles (6 kilometers).
Having filed relevant patents in both South Korea and the United States, Hyundai Motor and Kia now have plans to assess the feasibility of mass production following thorough durability and performance tests.
“This technology is expected to have a greater effect on models such as SUVs where it is difficult to improve aerodynamic performance. We will continue to strive to improve the driving performance and stability of electric vehicles through improvements in aerodynamics," said Sun Hyung Cho, Vice President and Head of the Mobility Body Development Group at Hyundai Motor Group, in a statement.
Hyundai Motor and Kia claim that they employ various technologies across their vehicles to attain competitive drag coefficients, including rear spoilers, active air flaps, wheel air curtains, wheel gap reducers, and separation traps.
Notably, the Hyundai IONIQ 6 stands out in this regard, achieving an exceptional Cd of 0.21. This underscores the brands' commitment to innovation and aerodynamic excellence, showcasing their prowess in optimizing vehicle performance for a sustainable and efficient driving experience, according to the companies.
Originally published on Interesting Engineering : Original article