How does ABS-Anti-lock Braking System work?

ABS is the abbreviation of Anti-lock Braking System. The earliest ABS system in the world was first used on airplanes, and later became a standard feature of luxury cars. Now most cars are equipped with ABS. 

As we all know, you can't brake with one foot, but should brake in steps, one foot and one release, until the car stops. However, when you encounter emergency braking, you often need to stop the car urgently. You want to stop the car with one foot. At this time, the wheels are prone to lock and not rotate, which may cause the car to be in a dangerous condition. For example, the front wheel locks and causes the car to lose its turning ability, and the rear wheel locks and easily causes a tail-spinning accident. 

The installation of ABS is to solve the problem of wheel locking when braking. Cars equipped with ABS can effectively control the wheels to keep in a rotating state instead of locking and not rotating, thereby greatly improving the stability of the car when braking and the braking performance of the car under poor road conditions.

ABS uses the speed sensors installed on each wheel or the transmission shaft to continuously detect the speed of each wheel. The computer calculates the wheel slip rate at that time (the slip rate can be used to understand whether the car wheel has locked), and compares it with the ideal slip rate to make a decision to increase or decrease the brake pressure, and command the actuator to adjust the brake pressure in time to keep the wheel in the ideal braking state. 

Therefore, the ABS device can keep the wheel in a rolling state with slight slippage, without locking, so as to achieve the purpose of improving braking efficiency.