Audi e-tron e-tron Sportback they can count on high motor skills thanks to four-wheel drive electric which permanently and variably adjusts the distribution of torque between the axles. The House of the 4 rings wanted to deepen its functioning.
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Per Michael Wein by Audi, the “quattro electric all-wheel drive is the perfect synthesis of performance and efficiency“. To obtain the maximum performance, under most conditions, the e-tron mainly use the rear electric motor. The decoupling of the front power unit while driving under normal conditions promotes efficiency. As there is no entrainment effect, there is no energy dissipation.
The front unit only comes into operation when the driver requires more power than the rear engine can deliver, or proactively, before traction is reduced due to slippery ground or sporty cornering driving. The electric all-wheel drive operates practically instantaneously. A feature possible thanks toabsence of any mechanical friction and the rapid distribution of electricity.
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The effectiveness of the quattro system is underlined by the evolution of electric all-wheel drive: electric torque vectoring here I’m on the Audi e-tron S and e-tron S Sportback. This technology allows you to share the torque between the rear wheels bringing the advantages of the classic sports differential. This technical solution is possible by virtue of the fact that these models have 3 electric motors, two of which are at the rear.
Even the S versions, under normal conditions, mainly use rear propulsion. The front axle can be activated predictively, thus combining effectiveness and efficiency. The distribution of the thrust between the rear wheels is activated in a few milliseconds while managing high torque values. When exiting the curves, accelerating decisively, up to 220 Nm more are transmitted to the external rear wheel than the internal wheel, to the advantage of quick insertion and agility. A behavior made possible, as mentioned, by the availability of the two electric motors without any mechanical connection.
The latency of electric torque vectoring it’s really very low, just 30 thousandths of a second. This is the time that elapses between the detection of the inputs by the sensors, the reaction of the electronic control unit dedicated to traction, the activation of the power electronics, the delivery of energy and the effective active distribution of the torque. A quarter of the time it takes for a mechanical system to react.
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