Does the semi-trailer need to be equipped with ABS system?

What is ABS system?

ABS is called anti-lock braking system, as the name suggests, is a device to prevent the wheel from being locked when the vehicle is braking, which can make the wheel and the road always maintain a rolling friction state, so as to improve the friction force (only on non-snow and ice roads).

The origin of ABS system?

The ABS system is designed to improve the braking efficiency of the vehicle.

Braking efficiency refers to the ability of the vehicle to slow down and stop during driving, mainly including braking distance, braking time and braking deceleration.

If the same car wants to obtain a greater braking effect on the same road surface, it can only change the longitudinal adhesion coefficient between the wheel and the road surface during braking. The greater the adhesion coefficient, the better the braking efficiency, and the adhesion coefficient depends on the wheel slip rate.

If you want the vehicle to be able to travel in the specified direction when braking, without deviation and sideslip, and maintain the steering ability, you need to improve the transverse adhesion coefficient between the wheel and the road, and the transverse adhesion coefficient also depends on the wheel slip rate.

After a lot of experiments and analysis, when the wheel slip rate is controlled at about 20%, the maximum longitudinal adhesion coefficient and large transverse adhesion coefficient can be obtained, that is, the best braking performance can be achieved. As a result, vehicle pioneers were able to control the ABS system, a device for wheel slippage approaching 20%.

Advantages of ABS system:

1, enhance the control of the vehicle. The vehicle installed with ABS system can still maintain a large degree of maneuvering during the emergency braking process, and the current party can timely avoid the necessary obstacles or dangerous situations. The vehicle without ABS is easy to lose control of the vehicle during emergency braking, resulting in sideslip, tail dumping and other accidents, and at the same time, it is very difficult to turn after the vehicle brake is locked, because the wheel and the ground belong to static friction at this time.

2, reduce the vehicle float phenomenon. Especially on wet, smooth roads in rain and snow weather, when the vehicle emergency braking, if the ABS system is not installed, the vehicle will keep inertia on the road and continue to slide forward after the wheel is locked. After the installation of ABS system, the chance of wheel locking is reduced, and therefore the chance of slipping during braking is reduced.

3, reduce tire loss, prevent tire wear. After the ABS system is installed, the phenomenon of wheel locking during emergency braking is eliminated and the possibility of flat spots forming on the tire surface is reduced. If the ABS system is not installed, if the wheel is locked, the ground and tire contact area will be worn all the time, and it is easy to form partial wear over a long period of time.

Misunderstanding of ABS system:

1, cognitive misunderstanding: ABS system can shorten the braking distance.

The main function of ABS is to prevent wheel locking, not to shorten the braking distance. ABS can take into account the maximum longitudinal adhesion coefficient and large transverse adhesion coefficient of the vehicle in the driving, to ensure that the vehicle does not lose control of the situation, but this does not mean that the vehicle equipped with ABS can shorten the braking distance, in the rain and snow wet road conditions, the braking distance of ABS is shorter than when the wheel is locked, but the braking distance on the ordinary road is longer.

2, the use of errors: the brake pedal does not step hard.

Vehicles equipped with ABS systems should press down the brake pedal during emergency braking so that the ABS system can play its role. When the ABS system starts, it is normal for the brake pedal to rebound, at this time, do not release the brake pedal, continue to step hard on it, and do not step loose, which will instead make the vehicle lose the braking effect and increase the risk.

Why do many car owners dislike ABS systems?

Because ABS prevents the wheels from fully locking, some owners feel that they are not slowing down enough after they step on the brakes. In addition, ABS will constantly adjust the brake pressure in emergency braking, which gives the owner the feeling of "spring foot", not as good as "brake king", a step on the brake immediately the wheel is locked, but the brake drum is easy to crack and damage for a long time. Some owners do not like ABS for simpler reasons, high cost, if not mandatory use will not choose this configuration.

Why do car owners think trailer ABS is not useful?

1. Technical level

Most domestic trailer production enterprises are still parked in the stage of simple welding production, and lack of design and experimental capabilities for more complex electronic auxiliary systems. In addition, the installation requirements of ABS system are relatively high, and installation errors are easy to occur without special technical training.

2. Market environment

Trailer production industry competition is fierce, many manufacturers strictly control production costs, trailer axle, ABS and other high-value parts have become the object of cost savings, a large number of counterfeit and inferior products flooded the market, the vast majority of trailers are assembled with unknown ABS systems, their biggest role is not to ensure safety, is to be able to successfully license, Most of the cards are removed after they're played.

Should the semi-trailer be installed with ABS?

If the ABS system is installed on the tractor, it is recommended to install it on the trailer, otherwise it is easy to have a mismatch between the main hanger, especially under emergency braking.

In addition, the ABS system of the main car can prevent the wheel from locking, and carry out the braking action of "side-rolling slide", which can directly lock the wheel of the semi-trailer, and the tire is prone to sideslip, which can easily lead to the vehicle losing control of the accident.

In addition, the main ABS mismatch is also easy to make the driving wheels of the main car in a long-term brake wear state, resulting in early excessive wear.