How Hyundai Increased EV Range Using New Active Air Skirts

Hyundai and Kia unveiled their ‘Active Air Skirt’ (AAS) technology to increase the range and efficiency of EVs, although it could be applied to any high speed vehicle.

Active Air Skirt controls airflow of air through the lower bumper. It calms the air around the wheels during highspeed driving. Turbulence causes drag and noise, both of which are unwanted, but it is the drag can affect the range. Whilst the saving here is minimal, the effect over time is substantial.

Manufacturers are trying reduce the coefficient of drag (Cd). The resistance coefficient of the air acting in the opposite direction of the vehicle’s motion is lowered when the AAS is installed. It sits  between the front bumper and the front wheels and deploys from its stowage area once the vehicle is over 80 km/h, then returns to the stored position under 70 km/h. The difference in deployment and storage speeds prevents the skirt from operating more often than needed.

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ABOVE: Active Airt Skirt improves Ev range

AAS only covers the front part of the tyres because the group’s E-GMP platform floor is flat, making the underside of the car inherently efficient. The Active Air Skirt also improves downforce, thus traction and high-speed stability.

AAS can is able to operate at speeds over 200 km/h with the use of a rubber surface on the lower part of the device. It reduces the effect of any objects hitting the surface, wearing it needlessly.

The Active Air Skirt  has improved drag by 2.8 percent, increasing the GV60 range by 6 km. it is sufficient to require patents in South Korea and the United States, with the group considering putting the Active Air Skirt on electric models in the future.

“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.”

Hyundai Motor and Kia are also using rear spoilers, active air flaps, wheel air curtains, wheel gap reducers and separation traps, to assist in lowering the drag coefficients. For example, Hyundai IONIQ 6 uses such fixtures these technologies to get a world-leading Cd of 0.21.

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