A pothole, a watt: thus generates electricity, the new suspension electromechanical Audi

Be called eROT, and is one of the developments in experimental more interesting that Audi is preparing: a suspension electro-mechanical that will be able to generate electric power with every bump, saving up to 3 grams of CO2 per km With the goal of saving the greatest possible number of grams per kilometre of CO2 car manufacturers must stretching the head and use the systems most picturesque of energy recovery. Since then, it is better to do traps in the approval testing of consumption.

How do the shock absorbers electro-mechanical eROT?

This project is a practical application of the latest electrical systems of 48 volts.

The shock absorbers eROT are a new development as applied to electrical systems on-board 48-volt. My colleagues have explained in this indispensable article what is the revolution of the 48 volt, which will allow the advent of the turbos electric, among other technical advances that will improve the performance and efficiency of cars. These shock absorbers electro-mechanical could very soon replace the existing shock absorbers, “fillings” of hydraulic fluid, which was invented decades ago.


eROT are structured as a suspension arm: think of a lever arm connected to the wheel. This arm moves with every bump and would be connected to a series of gears that transmit the movement generated by an electric motor. The electric motor would turn the electricity generated in the 48-volt system, removing load from the alternator and/or providing power to the battery (in the case of a hybrid system). Audi estimates that this system would save up to 3 g/km of carbon dioxide.

in Addition to recovering energy, can be used as a buffer controllable actively.

On a highway, well-paved, the system generates about 3 watts of power circulated by an asphalted road, up to a maximum of 613 W on a secondary road. The average power generated is about 150 W. In addition to energy recovery, can be used as a shock absorber, controllable actively. In addition to changing the hardness of the suspension or adjust it in real time to the conditions of the road eliminates the performance difference between the phases of compression and expansion in a hydraulic damper.


One of its additional advantages is that eliminates the need to mount a shock absorber in a vertical position, freeing up space that would be in a room more spacious or space for the battery in a vehicle electrified. A technology that of become cheaper enough to extract efficiently the energy is lost at every bump. And seen the state of our roads, insurance that would help us to save a few cents per kilometer, by reducing our consumption. Welcome to that savings.

Source: Audi
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