The full name of ESP is electronic stability program, which is called electronic stability control system of vehicle body. It is a further expansion of the functions of anti-lock braking system and traction control system, and it is also a part of automobile active safety system.

Electronic stability control system has many different names, such as VSA of Honda, VDIM of Toyota, ESC (domestic model) of General Motors and so on. Although the names are different, the principle is almost the same.

ESP is mainly composed of sensors, actuators and electronic control unit (ECU). Sensors generally include wheel speed sensor, steering wheel angle sensor, lateral acceleration sensor, yaw rate sensor, brake master cylinder pressure sensor, etc. Actuators generally include traditional braking systems (vacuum booster, pipeline and brake), hydraulic regulators and so on. The ECU is connected with the engine management system to intervene and adjust the engine power output.

ESP mainly controls the longitudinal and lateral stability of the vehicle, and ensures that the vehicle runs according to the driver's consciousness. When the car brakes, the tire will be stillborn, and the electronic stability system of the car body will brake hundreds of times in one second in the form of mechanical point braking, so that the car can still control the driving direction of the car through the steering wheel when it is fully braked, similar to the role of ABS. Million car purchase subsidy