ESC at a glance
Electronic stability control systems in trucks and large buses are designed to reduce untripped rollovers and mitigate severe understeer or oversteer conditions that lead to loss of control by using automatic computer-controlled braking and reducing engine torque output. ESC uses a computer and sensors to detect when the front or rear of a vehicle is moving inconsistently with the position of the steering wheel. The system can brake a single wheel to nudge the vehicle back on course.
ESC combines rollover protection with directional stability to reduce the likelihood of spinout and driftout. It becomes active when the system senses conditions that could produce imminent directional or roll instabilities, often before the driver is aware of them. Once the ESC start functioning, it reduces the engine torque and lowers the speed of the vehicle. The rollover control functionality limits the lateral acceleration of the vehicle to a pre-defined value which is dependent on the vehicle mass. When the vehicle reaches this maximum value, all the wheels of the towing vehicle and the trailer are braked. to reduce speed.