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Hyundai Motor and Kia unveil Active Air Skirt tech to enhance EV speed and range

Web TeamBy Web TeamJanuary 24, 20243 Mins Read
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Aerodynamic enhancements of the technology increase downforce, which improves vehicle traction and high-speed stability.

Hyundai Motor Company and Kia Corporation today unveiled the ‘Active Air Skirt’ (AAS) technology that minimizes the aerodynamic resistance generated during high-speed driving, effectively improving the driving range and driving stability of electric vehicles (EVs). AAS is a technology that controls the flow of air entering through the lower part of the bumper and effectively controls the turbulence generated around the vehicle wheels by operating variably according to the vehicle speed during high-speed driving.

In the EV era, competition to secure a better driving range from a single charge has become fierce, making the relationship between vehicles and aerodynamics even more important. Furthermore, aerodynamic performance has a significant impact not only on power performance but also on driving stability and wind noise.

In response, manufacturers are exploring various measures to reduce the coefficient of drag (Cd), which is the resistance coefficient of the air acting in the opposite direction of the vehicle’s motion.

AAS is installed between the front bumper and the front wheels of the vehicle and is hidden during normal operation, but it operates at speeds over 80 km/h when the aerodynamic resistance becomes greater than the rolling resistance and is stored again at 70 km/h. The reason for the difference in deployment and storage speeds is to prevent frequent operation in specific speed ranges.

AAS can also operate at speeds over 200 km/h. This was possible thanks to the application of rubber material on the lower part, which reduces the risk of external objects splashing and damaging while driving at high speeds and ensures durability.

Hyundai Motor and Kia announced that they have tested and reduced the drag coefficient (Cd) by 0.008, improving drag by 2.8 percent, by installing AAS in Genesis GV60. This is a figure that can expect an additional range improvement of about 6 km.

“This technology is expected to have a greater effect on models such as SUVs where it is difficult to improve aerodynamic performance,” said Sun Hyung Cho, Vice President and Head of Mobility Body Development Group at Hyundai Motor Group. “We will continue to strive to improve the driving performance and stability of electric vehicles through improvements in aerodynamics.”

Meanwhile, Hyundai Motor and Kia are applying various technologies, such as rear spoilers, active air flaps, wheel air curtains, wheel gap reducers and separation traps, to vehicles to secure competitive drag coefficients. Hyundai IONIQ 6, which incorporates these technologies, has achieved a global leading Cd of 0.21.

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