Electronic stability system or electronic stability program (ESP) is a combination of basic functions such as ABS, ASR, EBD, TCS and AYC (Active Yaw Control), and it is a new type of automotive active safety system. This system is an electronic control system for automobile chassis jointly developed by B0SCH and Mercedes-Benz. In the process of driving, due to external interference, such as sudden changes of pedestrians, vehicles or environment, drivers take some emergency avoidance measures to make the car enter an unstable driving state, that is, a dangerous state such as deviating from the scheduled driving route or overturning trend appears. A car equipped with ESP can identify and judge the unstable driving trend of this car in a very short millisecond. Through the intelligent electronic control scheme, the driving transmission system and braking system of the automobile can respond accurately, and these unstable driving trends can be eliminated in time and properly, so that the automobile can keep its driving route, prevent from tilting and avoid traffic accidents. ESP system is a major breakthrough in automobile active safety measures. It realizes safe driving by controlling the possibility of accidents, and ensures the stability and safety of cars in extremely harsh driving environment. 1. The components of the electronic stability system ESP for automobiles include yaw rate sensor, body turnover angular velocity sensor, lateral acceleration sensor, brake master cylinder hydraulic pressure sensor, steering wheel angle sensor, etc. On the basis of ABS and ASR sensors. The most important sensor is the body turnover angular velocity sensor, which is similar to the rotating angular velocity sensor used on the space shuttle and spacecraft. The angular velocity sensor of car body overturning is like a compass, which can monitor the accurate attitude of the car in time and the angular velocity of every possible overturning movement of the car. Other sensors monitor the speed of the car and the speed difference of each wheel, monitor the steering wheel angle and the horizontal lateral acceleration of the car, and monitor the distribution of power and braking force of each wheel when braking occurs. ESP system includes nine control functions: distance control, driver drowsiness prevention, speed limit identification, parallel warning, in-situ parking, night vision device, surrounding environment identification, comprehensive stability control and brake assist (BAS). Through the comprehensive application of nine intelligent active safety technologies, ESP can reduce the driver's risk of losing control of vehicles by about 80%. ESP intelligent on-board microcomputer control system monitors the driving state of the vehicle and the driver's driving intention at any time through various sensors, and sends various instructions to the actuator in time to ensure the driving stability of the vehicle under braking, acceleration, steering and other working conditions. Figure 1 shows the installation of various sensors of electronic stability system ESP and electronic stability system ECU on the car, in which two microcomputers with 56kB memory are configured. ESP system uses the signals of these two microcomputers and various sensors to continuously monitor the electronic modules in the car, the working state of the system and the driving posture of the car. For example, the speed sensor will check itself every 20 milliseconds ... ESP system also makes full use of advanced functions such as ABS, BAS and ASR. Through the signal communication network between electronic modules in the car. In an emergency, if the nervous driver does not apply enough braking force, the brake booster system BAS will automatically increase the braking force. When the ESP system can't work normally, ABS and ASR systems can still work to ensure the normal running and braking of the vehicle.