Description Of ESC Control
ESC system consists of: ABS/EBD, TCS and AYC functions.
ABS/EBD function: The IEB changes the active sensor signal (current shift) coming from the four wheel sensors into square waves. By using the input of the above signals, the IEB calculates the vehicle speed and the acceleration & deceleration of the four wheels. The IEB also determines whether the ABS/EBD should be actuated or not.
TCS function prevents the wheel slip of drive direction by adding the brake pressure and engine torque reduction via CAN communication. TCS function uses the wheel speed sensor signal to determine the wheel slip as far as ABS function.
AYC function prevents unstable maneuver of the vehicle. To determine the vehicle maneuver, AYC function uses the maneuver sensor signals (Yaw Rate Sensor, Lateral Acceleration Sensor, and Steering Wheel Angle Sensor).
If vehicle maneuver is unstable (Over Steer or Under Steer), AYC function applies the brake pressure on certain wheel, and sends engine torque reduction signal by CAN.
After the ignition on, the IEB continuously diagnoses the system for failures (self-diagnosis). If a system failure is detected, the IEB informs driver of the system failure through the BRAKE/ABS/ESC warning lamp (fail-safe warning).