The ABS anti-lock braking system is an automotive electronic system, which includes an electronic control unit, several wheel speed sensors and a valve assembly containing a solenoid valve. The electronic control unit uses the pulse changes from the wheel speed sensor to grasp the operating conditions of the wheels. When a certain wheel is likely to be locked, the electronic control unit will issue a command to the solenoid valve to achieve the purpose of controlling the brake and adjusting the speed through the rapid switch. Generally speaking, this kind of fast switching valve action can reach as many as 12 times per second. The ABS of some advanced models can have four loop systems, namely "four loop ABS". This high-tech product mainly has two types: electronic and mechanical. The electronic safety factor is higher and the price is also high. It was originally only equipped on large luxury cars, and small and medium-sized ordinary cars have also begun to be equipped; the mechanical safety factor is lower and the price is also low, and it is generally only used in commercial vehicles. In my country, Dongfeng Motor Corporation began to organize the development of ABS in 1992 and passed the technical appraisal in December 1995. The "Che'an" brand ABS developed by Sichuan Che'an Technology Development Company has been used in some mini-cars. ABS has become the mainstream of automobile technology in the 20th century, and the era when all cars are equipped with ABS is not far away. The famous Marxist educator Makarenko once said when talking about human self-control: "There can be no car without brakes." It can be seen that the braking system of a car is the same as human self-control. However, although the traditional braking system can play an emergency braking role, it is easy to cause the car tires to lock up. When the tire is locked, the car will still glide a certain distance on the road due to inertia. The tire changes from rolling to sliding, the friction coefficient increases, the adhesion coefficient decreases, and the lateral displacement of the car can easily lead to accidents such as wear, puncture, sideslip, and tail-flicking. In order to overcome the lock phenomenon of the traditional braking system, people invented the ABS anti-lock braking system (Anti-lock Braking System). The principle of the system is to keep the tires rotating and prevent the tires from locking during emergency braking to maintain the maximum braking force; at the same time, it also controls the wheels quickly, accurately, effectively and safely, so that the longitudinal adhesion coefficient of the wheels reaches the peak value. , The lateral adhesion coefficient also maintains a high state, so as to achieve the effect of increasing the braking speed, shortening the braking distance, stabilizing the braking direction, and preventing wheel lock.
