Modelled on nature: New MAHLE fan for e-vehicles

MAHLE presented a world first at the IAA Transportation 2024 in Hanover

• New component for fuel cell and electric vehicles halves fan noise on average
• Bionic fan is based upon an AI-optimized design found in nature: the wings of an owl, one of the quietest birds
• 10 percent higher efficiency and 10 percent less weight than conventional fans
• Scalable power range enables usage in passenger cars through to commercial vehicles
• MAHLE makes electrification more attractive and efficient
• Fan will be a world first at the IAA Transportation 2024 in Hanover
• MAHLE to present further innovations under the motto “Technological diversity”

MAHLE is presented a world first at the IAA Transportation 2024 in Hanover: a bionic high-performance fan which makes commercial vehicles significantly quieter. The fan was developed for particularly demanding fuel cell and battery electric vehicles. When optimizing its ventilation blades with the use of AI, the MAHLE engineers took inspiration from the wings of an owl: One of the quietest birds in the world, the owl’s plumage has a noise-reducing effect.

The bionic fan blades can reduce the fan noise of a truck by up to 4 dB(A) – this is equal to more than halving the sound output. This significant reduction solves another challenge for e-mobility: loud fan noise, which can be disturbing both at full load as well as when charging the vehicle at night, whether in residential areas or during resting times at service stations.

The fan is also significantly more efficient than conventional designs, thanks to 10 percent better performance and a 10 percent lighter design. MAHLE also enables the use of its new bionic fan in passenger cars. The company is presented the product to the public for the first time at the IAA Transportation.

We learn from nature: It inspires us in many areas! We have already seen success with our bionic battery cooling plate, a technology which helped us significantly while optimizing our fan,” said Dr. Uli Christian Blessing, Head of Development Thermal Management at MAHLE. “With the help of AI, we analyzed the characteristic features of bats, swordfish, and many other inspirations from nature. We finally ended up with the owl, the silent hunter, as the  main template for our new fan.”

The design of the fan blades was modeled on owl wings and feathers. This minimizes noise turbulence and makes the fan much more quiet and efficient. “One can imagine the sound reduction power of our fan to be like that of turning off one of the speakers on a stereo system,” Blessing said.

It is particularly in noise-sensitive areas that the new bionic high-performance fan shows its strength. During fast charging of vehicles, for example, reduced noise levels increase comfort for drivers and area residents alike. MAHLE offers the fan in a broad power range from 300 watts to 35 kW. This enables its use in small electric passenger cars all the way through to large, particularly temperature-sensitive fuel cell trucks. The first prototypes are already being trialed by various passenger car and commercial vehicle manufacturers.

“With this new product, MAHLE continues to pave the way for the electrification of mobility – and contributes to make it more attractive for customers,” said Blessing.

To save even more weight, MAHLE also developed the fan cover and
carrier in accordance with bionic principles. As a result, both components are more than 10 percent lighter, and have increased structural integrity.

Electrification and thermal management, i.e., heating and cooling, are closely interwoven. Efficient electrification is not possible without efficient thermal managment. MAHLE is one of the few global suppliers active in both fields, where it leverages its excellent expertise to develop technical solutions for all drives.

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