What is the function of ABS brake anti lock braking system???

What exactly is the ABS anti-lock braking system used for?

Prevents sideslip when braking.

ABS is the English abbreviation of anti-lock braking system, which is used to automatically control the braking force of the brake when the car is braking, so that the wheels are not locked up, and are in a state of rolling and slipping (slip rate of about 20%), so as to ensure that the adhesion between the wheels and the ground is at the maximum.

The working principle of the anti-lock braking system: during the braking process, the ABS control unit continuously obtains the speed signal of the wheel from the wheel speed sensor, and processes it, and then determines whether the wheel is about to be locked or broken. ABS brake is characterized by the fact that when the wheel tends to lock the critical point, the pressure of the brake cylinder does not increase with the increase of the pressure of the brake main cylinder, and the pressure changes near the critical point of locking.

If the wheels do not enter the locking state, the brake pressure regulating device does not participate in the work, and the braking force will continue to increase; If it is judged that a certain wheel has a tendency to lock, the ECU sends a command to the brake pressure regulator to close the passage between the brake cylinder and the brake wheel cylinder, so that the pressure of the brake wheel does not increase.

Generally speaking, a normal braking system can make the car brake as short as possible, but if the braking is too late to stop completely before colliding with an obstacle, it still cannot prevent an accident from happening. The biggest function of the anti-lock braking system is to maintain the ability to control the steering while maintaining the brakes, so we can operate the steering wheel to avoid danger while pressing the brakes during emergency braking, so as to avoid accidents.

Photo by Li Xiongwei of Pacific Automobile Network).

Anti-lock braking system is an active safety system on the car, which is often called "ABS" braking system, which is improved on the basis of conventional braking devices, and its main role is to prevent wheel locking during emergency braking.

If both front wheels are locked at the same time, the car basically travels in a straight line, but loses steering control and cannot avoid obstacles; If the rear wheels are locked at the same time, the car will be in danger of skidding and tail flicking under the action of very little lateral force. Therefore, now cars are basically equipped with ABS to prevent this danger from happening.

The working principle of ABS system: mainly relying on the high-sensitivity wheel speed sensor installed on each wheel and the speed sensor on the transmission, according to the degree of wheel slippage, automatically controlled by the computer through a set of hydraulic control system, so that the car is always in a state of locking and rolling when braking suddenly, that is, the cyclic working process of locking and loosening. The pressure increase and decrease in the brakes can be adjusted very quickly, reaching 10 20 times per second, and up to 60 times in high-end cars (the higher the frequency of adjustment, the better the braking effect).

So that the wheels are kept rolling all the time, without locking, to ensure that the car still has a good steering ability during emergency braking, and to prevent side slip or tail flicking.

Photo by Qi Hesong) @2019

Anti-lock braking system used in the case:

1. The full name of anti-lock braking system ABS is Anti-lockbrakesystem, that is, ABS, which can be installed on any car with hydraulic brakes. It is the use of a rubber airbag in the valve body, when the brake is stepped on, the brake oil pressure is given, which is filled into the valve body of ABS, and the airbag uses the air compartment in the middle to return the pressure to make the wheel avoid the locking point;

2. ABS (anti-lockbrakingsystem) anti-lock braking system, through the sensor installed on the wheel, the signal that the wheel will be locked is sent out, the controller directs the regulator to reduce the oil pressure of the wheel brake cylinder, reduce the braking torque, after a certain period of time, and then restore the original oil pressure, and constantly circulate like this (up to 5 10 times per second), always make the wheel in a rotating state and have the maximum braking torque;

3. The car without ABS is installed, if the brake pedal is pressed hard during driving, the wheel speed will be rapidly reduced, when the braking force exceeds the friction between the wheel and the ground, the wheel will be locked, the wheel that is completely locked will make the friction between the tire and the ground decrease, if the front wheel is locked, the driver can not control the direction of the vehicle, if the rear wheel is locked, it is very easy to slip sideways;

4. ABS, which was originally applied to the technology of the train, was later applied to the aircraft, and now it is very popular, and it can be seen in the cars of more than 100,000 yuan, and some buses are also equipped with ABS. When a vehicle equipped with an ABS encounters slippery roads such as snow, ice, or rain, it can safely operate the steering wheel and brake. It not only effectively prevents accidents, but also reduces the wear and tear on the tires, but it does not make the car shorten the braking distance, and in some cases it increases.

What does ABS mean? In fact, this is the English abbreviation of anti-lock braking system, which is an auxiliary system under emergency braking. Usually at high speeds, once the vehicle brakes urgently, it is easy to cause the vehicle to slide or roll over, and ABS works at this time.

As an anti-skid braking device, it can reduce the probability of accidents during emergency braking.

First, the working principle of ABS.

What does car ABS mean? The anti-lock braking system is mainly composed of ECU control unit, wheel speed sensor, brake pressure adjustment device and brake control circuit. Because of the situation we have just encountered, when braking in an emergency, the car is easy to skid or overturn, and ABS, as an anti-skid braking device, can control the slipping rate at 10-20%, obtain the maximum longitudinal braking force, improve the braking effect, and shorten the braking distance.

During braking, the ABS control unit continuously obtains the wheel speed signal from the wheel speed sensor and processes it, and then determines whether the wheel needs to be locked. When the wheel is approaching the lock-up critical point, the pressure of the brake master cylinder does not increase with the increase of the brake master cylinder pressure, but changes slowly near the lock-up critical point. ABSECU sends a command to the brake pressure regulator to adjust the pressure of the brake wheels so that the wheels do not lock up and an accident occurs.

Second, the reason why the ABS light is on.

1.When the speed exceeds 10 km h, no speed preference is transmitted to the ABS control unit.

2.When the speed is greater than 40 km/h, the speed signal exceeds the tolerance value.

3.The sensor has an identifiable open circuit or short circuit to the anode and ground.

3. The solution of ABS light.

1.Check the wiring and plug for poor or damaged contact.

2.Check the installation clearance, mounting position, and whether the wheel speed sensor and ring gear are contaminated with dust or magazines.

3.Check whether the wheel bearing clearance is too large and adjust the clearance to the normal value.

4.Avoid driving at high speeds, avoid sudden braking, and go to the 4S shop for maintenance as soon as possible.

ABS anti-lock braking system is to automatically control the braking force of the brake when the car is braking, so that the wheels are not locked and are in a state of rolling and slipping (slip rate is about 20%), so as to ensure that the adhesion between the wheels and the ground is at the maximum.

ABS controls the pressure of the brake line acting on the wheel brake cylinder, so that the wheels of the car will not lock up during emergency braking, so that the car can still maintain good directional stability during emergency braking.

In a car that is not equipped with ABS, such as Huguo braking on snow, the car can easily lose directional stability; At the same time, if the driver wants to stop, he must use a hydraulic regulator (also known as an actuator with a nuclear grip). Conversely, if the car is equipped with ABS, the ABS can automatically issue control commands to the hydraulic regulator, so that the brakes can be controlled more quickly, accurately and effectively.