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The Audi R18 e tron Quattro Hybrid Pioneer WEC 60 Seconds - 2017 NCR TV HD

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Hybrid pioneer Audi, the first manufacturer to have won the Le Mans 24 Hours with an energy recuperation system, was using a flywheel energy storage system from 2012 to 2015. Now the time is ripe for the next step. In the future, a battery will be accumulating the energy. Electrokinetic technology is being replaced by an electrochemical storage system. “The flywheel accumulator definitely proved viable for the lower energy classes,” explains Thomas Laudenbach, Head of Electrics, Electronics and Energy Systems at Audi Sport. “But due to the fact that we now have to process even more energy than before, a technology change suggested itself.” The previous flywheel accumulator guaranteed high power density. Now, favorable energy density has to be achieved as well, as Audi is switching to a higher hybrid energy class. Starting in the 2016 season, the amount of energy will increase by 50 percent to 6 megajoules. When comparing this level with the one from the 2014 season, the engineers have even tripled the amount of recuperated energy within this period of time.
The transmission is a new design as well. Audi’s simulations revealed that the optimized engine allows a very good gear ratio spread with minimal rpm jumps even in combination with a six-speed instead of the previous seven-speed unit. As a result, the engineers managed to further reduce the weight of the transmission. In the other areas of the vehicle’s structure, Audi rigorously pursued its lightweight design approach as well, while retaining the high torsional stiffness of the chassis.
In addition, new solutions for the actuators of individual systems of the Audi R18 help reduce weight. While in the previous-generation vehicle electrical actuators were still operating in the braking, transmission and engine systems, the new Audi R18 uses an all-new development of a high-pressure central hydraulic system. The regulations prescribe a minimum weight of 875 kilograms for the LMP1 hybrid sports cars. In spite of a more powerful and therefore necessarily heavier hybrid system, Audi does not exceed this limit.
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