To implement the specified functions, the ESP system control unit (N30/4) accepts the following signals as input.
To determine driver intent:
- steering wheel sensor signal (B24/8);
- accelerator pedal position sensor signal (B37/3).
To determine the actual behavior of the car on the road:
- yaw and lateral acceleration sensor signal (824/15);
- brake pressure sensor signal (B34);
- wheel speed sensor signals:
- front left (L6/1);
- front right (L6/2);
- rear left (L6/3);
- rear right (L6/4).
ESP control unit (N30/4) performs the following functions as a processor that implements predetermined algorithms.
- ESP function.
- ABS function.
- Traction control function (ETS).
- The function of the system to increase the pressure in the brakes during emergency braking (BAS).
- Slippery road acceleration function (ASR).
- The function of the distribution of braking force between the axles (EBV).
In fact, the ESP system is an extended system that, in addition to its own specific functions, performs those functions that were previously performed by simpler separate systems.
To do this, the ESP control unit (N30/4) interacts with both the brake control system and the engine control system (CDI) via the CAN C multiplex network responsible for engine control.