Anti-lock braking system
Nov 12, 2021
Anti-lock braking system
What is the role of the ABS system? The anti-lock braking system can improve the safety factor of the vehicle's emergency braking when driving. In other words, a car without ABS is prone to tire lock when the car takes emergency braking in an emergency, that is, the steering wheel cannot be turned, so the risk factor will increase and it is easy to cause serious consequences.
Single-channel ABS generally controls the two rear wheels together according to the principle of low selection. Single-channel ABS cannot make full use of the adhesion of the two rear wheels, so the braking distance may not be significantly shortened. In addition, the front wheel brake is not controlled, and the front wheel will still be locked during braking, so the steering control ability has not been improved. However, since the two rear wheels will not lock during braking, the braking can be significantly improved. The directional stability at the time is a great advantage in terms of safety, and at the same time the structure is simple, and the cost is low, so it is widely used in light trucks.
To sum up, although the ABS device can shorten the braking distance, in addition, due to the composition structure and other reasons, the price of different types of ABS devices is also quite different, so when you buy a car, you should not only see the price, but also the installation What type of ABS device is it?
When the wheel is about to reach the next dead point, the pressure of the brake fluid causes the airbag to repeatedly act, so that it can act 60 to 120 times in one second, which is equivalent to constant braking and relaxation, which is similar to the mechanical "point brake" ". Therefore, the ABS anti-lock braking system can avoid the direction loss and wheel side slip during emergency braking, so that the wheels will not be locked when braking, and the tires will not rub against the ground at one point, thereby increasing the friction and making the brakes. The efficiency reaches more than 90%, while reducing brake consumption and extending the service life of brake drums, discs and tires twice. The anti-skid performance of vehicles equipped with ABS on dry asphalt roads, rainy days, snowy roads and other roads can reach 80%-90%, 10%-30%, and 15%-20% respectively.
The ABS system itself has its limitations, and it still cannot get rid of certain physical laws. In both cases, the ABS system cannot provide the shortest braking distance. One is on smooth dry roads where experienced drivers directly brake. Another situation is to brake on loose gravel roads, loose soil roads or roads with deep snow.
In addition, usually on dry roads, the latest ABS system can control the slip rate in the range of 5%-20%, but not all ABS brakes at the same speed or the same degree. Although the four-wheel anti-lock braking system can enable the car to brake in the shortest possible distance, if the braking is carried out too late so that it cannot stop completely before colliding with an obstacle, it still cannot prevent the accident from happening. .