How is the regenerative braking in the Audi e-Tron's electric motors optimized for maximum efficiency?

I have heard that regenerative braking is a key feature of electric vehicles, but I am curious about how specifically it is implemented in the Audi e-Tron. Can you explain the technical aspects and optimizations that allow for efficient energy recuperation?

The Audi e-Tron uses a system called 'brake-by-wire' in which the electric motors act as both an accelerator and a brake. This allows for efficient energy recuperation during braking as the motors can capture and store energy that would otherwise be lost.