Lei Ling ESP system is actually a traction control system. Compared with other traction control systems, ESP can control not only the driving wheel but also the driven wheel. For example, rear-wheel drive cars often oversteer. At this time, the rear wheel is out of control, and ESP will slow down the front wheel on the outside to stabilize the car; When the steering is too small, ESP will slow down the inner and rear wheels to correct the driving direction and thus correct the tracking direction.
ESP system includes ABS (Anti-lock Brake System) and ASR (Driving Acceleration Slip Adjustment), which are the functional extensions of these two systems. Therefore, ESP can be regarded as the most advanced form of automobile anti-skid device. ESP system consists of control unit, steering sensor (monitoring the steering angle of the steering wheel), wheel sensor (monitoring the rotating speed of each wheel), sideslip sensor (monitoring the rotating state of the car body around the vertical axis), lateral acceleration sensor (monitoring the centrifugal force when the car turns) and so on. The control unit judges the driving state of the vehicle through the signals of these sensors, and then sends out control instructions. There are cars with ESP, only ABS and ASR. The difference between the two is that ABS and ASR can only react passively, while ESP can detect and analyze the car condition, correct driving mistakes and prevent problems before they happen. ESP is particularly sensitive to oversteer or understeer. For example, if the car turns left excessively (turning too fast) when the road is slippery, it will throw its tail to the right. When the sensor senses the slip, it will quickly brake the right front wheel to restore its adhesion and generate the opposite torque to keep the car in the original lane. Of course, everything has a range of degrees. If the driver drives blindly, it is difficult to protect any safety device now.
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