The main basic information for calculating the steering assistance consists of the steering torque which the driver introduces via
the steering wheel, the vehicle speed and the steering angle. The steering torque is transmitted to the control unit via a discrete
wire by the steering moment sender G269 contained in the module. The vehicle speed and steering angle are sent using FlexRay via
the ABS control unit J104. Two temperature sensors monitor the temperature of the control unit and that of the output stages. The
output stages provide the current to activate the motor while also taking the rotor position of the synchronous electric motor into
account. The control unit receives the information on the rotor position from within the module. It comes from a rotor position
sender in the electric motor.
The steering assistance is activated after the vehicle is started (terminal 15 on) and the drive system is activated.
The additional functions familiar from other Audi models, such as assist-based steering impulses (driver steering recommenda-
tion - DSR), “software” end stops and active steering resets have also been implemented on the Audi e-tron GT.
The EPS unit is fitted on the subframe behind the front axle. The module consists of the steering rack, the electric motor with
toothed belt and ball screw drive, the power steering control unit J500, the steering moment sender and the track rods and boots.
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