Electric cars , as we know, do not emit CO2 and all the pollutants typical of cars equipped with an internal combustion engine . But when a battery-powered car moves, it still produces some kind of “ emission ''. Let's think, for example, of the particulate matter produced by the braking system .
The German Aerospace Center (DLR) together with the automotive company HWA, has developed a particular prototype of electric car that allows a mobility; really almost completely emission-free. It is called Zero Emission Drive Unit & ndash; Generation 1 (ZEDU-1), a special car that has a system that avoids the diffusion of the particles produced by the braking system and tires.
THE TECHNOLOGY 
Gi & agrave; from the photos of the prototype it is clear that the solution to practically reduce the emission of particulate matter to zero is; been integrated directly on the wheels of the car.
The prototype does not have a classic braking system. The brakes have been removed from the wheels and moved inside the electric motor transmission. Since & eacute; most of the deceleration occurs through regenerative braking, the mechanical components of the brake can be more; small and light. When more braking power is needed, the oil-immersed mechanical multi-disc brake system comes into operation and the particulate matter produced is then filtered. In addition to the mechanical brake, the team developed an induction brake for this prototype.
As for the particulate matter emitted by the tires, the solution is; was found by creating a specific wheel arch. Its particular shape allows to create a negative pressure inside it while driving. In this way, the particulate matter emitted by the rolling of the tires is concentrated in a single point. Particulate which is then aspirated and collected.
This prototype is; already was subjected to a series of tests that confirmed its validity; of this technical solution.
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The idea is; to offer this technology to car manufacturers in order to be able to integrate it, in the future, on production cars to make them even more & ugrave; sustainable. This prototype & egrave; was realized through a grant from the Ministry of Economy, Labor and Tourism of the state of Baden Wurttemberg. The development and construction project of this car required an investment of 6 million euros. Tjark Siefkes , Director of the DLR Institute for Vehicle Concepts in Stuttgart, commented:
For us, people's health and a clean environment are paramount. The ZEDU-1 project focuses on components that have so far received little attention and are now gradually being regulated in their emissions by the European Commission through legislative measures: i.e. brakes and tires. With the ZEDU-1 prototype we show solutions on how we can travel virtually emission-free. Our concept is highly efficient, extremely compact, suitable for everyday use and versatile.
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