Because ESP is a patented product of Bosch, only Bosch's body electronic stability system can be called ESP. After Bosch, many companies have developed similar systems, such as Toyota's VSC and BMW's DSC. The full name of ESP is: (Electronic Stability Program). Including ABS and ASR, it is an extension of the functions of these two systems. The ESP system consists of a control unit and a steering sensor (monitoring the steering angle of the steering wheel), a wheel sensor (monitoring the speed of each wheel), a sideslip sensor (monitoring the rotation of the car body around the vertical axis), and a lateral acceleration sensor (monitoring when the car is turning). centrifugal force) and other components. The control unit uses the signals from these sensors to judge the operating status of the vehicle and then issues control instructions. The difference between cars with ESP and cars with only ABS and ASR is that ABS and ASR can only react passively, while ESP can detect and analyze vehicle conditions and correct driving errors before they happen. ESP is particularly sensitive to oversteer or understeer. For example, when a car oversteers to the left (turns too sharply) on a slippery road, it will drift to the right. When the sensor senses the slip, it will quickly brake the right front wheel to restore steering. Apply force to produce an opposite torque to keep the car in its original lane. Of course, everything has a range of degrees. If a driver blindly drives fast, no current safety device can guarantee his safety. DSC The ESP name has been registered by the German Bosch company. Therefore, electronic stability systems developed by other companies can only use other names. Such as BMW's DSC. Its performance is similar to the ESP of the German Bosch Company. It can ensure the stability of the vehicle and ensure the traction of all wheels when starting or accelerating. It can detect the first signs of oversteer or understeer, and DSC will take action to prevent the vehicle from drifting. VSC VSC's full name is Vehicle Stability Control, which is a vehicle stability control system developed by Toyota. As the vehicle's auxiliary control system, VSC can control sideslip caused by hard steering or slippery road surfaces. When the sensor detects sideslip of the vehicle, the system can automatically control the braking of each wheel and the engine power. VSC can monitor the vehicle dynamic information provided by various sensors at any time while the vehicle is driving to understand the current status of the vehicle. When the vehicle body slips and the sensor information differs from the smooth driving data, the system determines that the vehicle is slipping, automatically intervenes in the vehicle's control, and uses the accelerator and brake controllers to correct the vehicle's dynamics. Since all skidding phenomena are caused by part of the wheel exceeding the adhesion capacity that the wheel can carry, the VSC system developed for the skidding problem can provide a high standard of active safety. When the grip of the front or rear wheels reaches the limit, the stability of the car's steering will be greatly affected. When the vehicle is turning, if the front wheel reaches the grip limit first, it will cause understeer. At this time, the driver cannot reduce the turning radius no matter how hard he turns the steering wheel, making it difficult to follow the vehicle and leading to steering failure. And if the rear wheel reaches the adhesion limit first, it will cause a drift phenomenon and the vehicle itself will become unstable. The VSC system brakes different wheels independently to generate corresponding rotational torque on the vehicle to avoid head pushing or tail flicking. In order to suppress the sideslip of the front wheel, the rear wheel is first braked to produce an inward rotational movement, and then the four wheels are braked to reduce the vehicle speed to a certain level to balance the rotational movement and make the steering within the range of the turning force. conduct. When the rear wheel slips, the outer front wheel is braked to produce an outward rotational movement to ensure the stability of the car.