ABS is the English abbreviation for automotive anti lock braking system, which is developed on the basis of conventional braking devices. Its function is to automatically control the amount of braking force on the wheels during car braking, so that the wheels are not locked and are in a rolling and sliding state (with a slip rate of about 20%), to ensure that the adhesion between the wheels and the ground is at its maximum value, and to maintain a certain steering ability of the steering wheels to avoid obstacles.
The speed of the wheels is transmitted to the electronic control unit, which commands the action of the brake pressure regulator to adjust the braking force of the wheel brakes. During emergency braking, once a certain wheel is found to be locked, the electronic control unit immediately commands the pressure regulator to depressurize the brake cylinder of the wheel, causing the wheel to resume rotation. The working process of ABS is actually a cycle of lock release lock release, which keeps the vehicle in an intermittent rolling state of critical lock up. It can effectively prevent the car from deviating, slipping, and spinning during emergency braking, and prevent the body from losing control.
The ABS system of a car has a self diagnostic function. When a component in the system malfunctions or a logical conflict occurs during operation, the electronic control unit will record these faults and store them in the form of fault codes in the ECU, while also illuminating the ABS fault light.
There are many reasons that cause the ABS fault light to light up, and it is generally necessary to use a car fault diagnosis instrument to detect the car, read the fault code, and determine the fault location. Common causes include damaged fuses, faulty or open circuits, dirty or damaged wheel speed sensors, damaged electronic control units, and damaged brake pressure regulators. It should be noted that sometimes a malfunction of the wheel speed sensor is detected, but it is not that the sensor is broken, but that it is dirty. Just clean it up, but the repair shop will replace it in order to make money. At this point, you need to be extra attentive and have the repairman clean it up first. In addition, the system may experience occasional logical faults. Although the ABS fault light will also be illuminated, there is no substantial component damage. Once the fault code is cleared, it will be resolved.
When the ABS system malfunctions, the car will stop the ABS system in order to ensure braking safety. At this point, the car is not without brakes, but only has conventional braking capabilities. During emergency braking, the wheels will directly lock up, the brake pedal will not have a bouncing sensation, and the car will not be able to turn. In addition, other brake assist systems in cars, such as the Electronic Stability System (ESP), Drive Anti slip System (TSC), Electronic Brake Force Distribution System (EBD), etc., are all extended functions based on the ABS system. When the ABS system fails, they will also lose their function, greatly reducing the handling performance of the car and sharply weakening the control ability of the body, There is a risk of losing control when the car undergoes emergency lane changes and emergency braking. So, when the ABS system of the car malfunctions, the driver should drive the car carefully, not at high speeds, avoid emergency braking, and be even more careful when driving on slippery roads. They should go to the repair shop for repair as soon as possible to avoid larger malfunctions.