Audi e-tron quattro concept - Electric drivetrain with up to 370 kW
Audi e-tron quattro concept
According to the extensive and detailed article over at Green Car Congress, the upcoming all-wheel-drive Audi Q6 e-tron (e-tron quattro) will set the new bar for vehicle handling and advanced vehicle dynamics control.
Audi bets on a three motor layout, with an axial motor for the front and two separate co-axial motors for the rear wheels.
Two motors in the rear brings capability of control of both rear wheels independently and if Audi manages to tame the software, e-tron quattro will “turn like a hunting dog after a rabbit”.
You could even do a burnout with one wheel if the software allow for this.
The two motor system for the rear is borrowed from the R8 e-tron. Siegfried Pint, Audi’s new Head of Electric Powertrain notes:
"The new two-motor rear axle system leverages the work Audi has already done with the two-motor rear-wheel drive on the R8 e-tron sports car. The two powerful motors (individual output is not yet specified) enable superb lateral dynamics with huge potential for torque vectoring, Pint noted. The rear motors offer a good balance between maximum and continuous output.
The design provides direct control of the wheels; there is no differential mechanism as in some other electric vehicle designs—a key point, Pint emphasized, for a number of factors including weight, response, and span of control.
The key is clearly the software control of the interplay of the torque of the two motors—not just for performance, but also for safety. Regulators want to ensure that the car will drive straight, Pint said. “Mis-torque vectoring” must be precluded. A massive differential torque of 5,000 N·m is possible, Pint added. (Recall the 1,800 N·m differential torque for the RS5 quattro above.)
The Audi team is very far along with the high level Torque Control Manager, which works together with the Electronic Stabilization Control (ESC) to distribute the power between the rear wheels, and on the regen controls, Pint said. There is still work to be done on control and coordination with the front motor, and with controls for the other dynamic forces involved with vehicle movement."
Source: Green Car Congress