How does ESP function?
The electronic stability program (ESP) is a further enhancement to the Anti-Lock Braking System (ABS) and Traction Control System (TCS). The ESP is designed to detect a difference between the drivers control inputs and the actual response of the vehicle. When differences are detected, the system intervenes by providing braking forces to the appropriate wheels to correct the path of the vehicle. This automatic reaction is engineered for improved vehicle stability, particularly during severe cornering and on low-friction road surfaces, by helping to reduce over-steering and under-steering. To implement ESP functionality, sensors must be added to the ABS system. A steering wheel angle sensor is used to detect driver input, with a yaw rate sensor and a low-G sensor that measure the vehicles response. Some ESP systems include a connection to the powertrain controller of the vehicle to enable reductions in engine torque when required.
