Audi is working on a prototype which uses electromechanical rotary dampers to replace traditional hydraulic dampers.
German car maker Audi has unveiled innovative new shock absorption technology that can save fuel by recovering energy absorbed via the suspension from shocks encountered along the road.
Audi is working on a prototype called eROT, which uses electromechanical rotary dampers to replace traditional hydraulic dampers. The aim is to use every possible source of kinetic energy in the car -- induced when the vehicle drives over bumps and potholes in the road -- and transform it into electricity to power the car and save fuel.
Audi's engineers have developed a lever arm which absorbs the motion of the wheel carrier system. This force is then transmitted to an electric motor, which converts it into electricity. The manufacturer promises output of 100 to 150 watts on average, based on initial testing in Germany. However, output is greatly affected by the type of road and quality of its surface. This can range from 3 watts for a smooth, freshly surfaced freeway to more than 600 watts for a relatively rough secondary road. In real-life driving conditions, Audi expects this technology to save drivers up to 3 grams of CO2 per kilometer (4.8g/mile).
The eROT system is based entirely on a 48-volt electrical system. Electric motors arranged horizontally on the rear axle replace upright telescopic shock absorbers. This arrangement also helps make more space for luggage in the trunk.
What's more, this active suspension adapts ideally to irregular road surfaces for a comfortable ride.
Audi hopes to install this system or its derivatives in future consumer vehicles. From 2017, Audi's 48-volt system will be used in a new hybrid model from the brand, promising potential fuel savings of up to 0.7l/100 km.
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