The 2023 Audi Q8 e-tron features model marks the first time Audi has used three electric motors in a mass-produced model. This concept is continued in the SQ8 e-tron. The front axle is driven by an electric motor with a peak output of 124 kW. On the rear axle, there are two electric motors both with 98 kW of peak output that separately power a rear wheel. In boost mode, the front-axle motor produces up to 157 kW, and the two rear motors 138 kW each; this would amount to a total boost power of 433 kW, however, the value is limited to 370 kW by the battery. This means the SUV, which is just under five meters long, accelerates like a sports car from zero to 100 km/h in 4.5 seconds. In addition to acceleration, the drive concept shows its strengths on winding roads in particular; because the two rear electric motors are not connected in any way or coupled via a differential, apart from the shared cooling system, they can distribute the drive torque completely variably between the rear wheels.
Since there are no mechanical drives forces, only data and electric current, electric torque vectoring directs drive torque to the appropriate wheel in no more than five milliseconds. The latency, i.e., the time offset, is only around a fifth of that of a mechanical system - when cornering at high speed, the rear axle does not need to apply the brakes to keep the vehicle agile and stable.
When drivers accelerate out of curves dynamically, the outside rear wheel receives up to 220 Nm more than the inside one due to the gear ratio - the difference at the wheels is around 2,100 Nm. The yaw torque that is generated not only supports the self-steering behavior, but also requires a tighter steering angle to maintain the cornering radius.
Source: Audi
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18 дек 2022
