Description Of ESC Control
ESC system consists of ABS/EBD, TCS functions.
ABS/EBD function: The ECU changes the active sensor signal (current shift) coming from the four wheel sensors into square waves. By using the input of above signals, the ECU calculates the vehicle speed and the acceleration & deceleration of the four wheels. And, the ECU 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.
If vehicle maneuver is unstable (Over Steer or Under Steer), ESC function applies the brake pressure on certain wheel, and sends engine torque reduction signal by CAN.
After the ignition on, the ECU continuously diagnoses the system for failures (self-diagnosis). If a system failure is detected, the ECU informs driver of the system failure through the BRAKE/ABS/ESC warning lamp (fail-safe warning).