The full name of automotive ABS is Anti-lock Braking System (Antilock Brake System). Its function is to automatically control the braking force of the brake during vehicle braking, preventing the wheels from locking up and maintaining a state of rolling while slipping (with a slip ratio of about 20%), ensuring that the adhesion between the wheels and the ground is at its maximum. Classification of ABS: ABS is mainly classified according to channels. In ABS, the brake pipelines that can independently adjust brake pressure are called control channels. ABS control channels are divided into four-channel, three-channel, two-channel, and single-channel types. Single-channel ABS: Also known as one-channel ABS, it has a single brake pressure regulator installed in the rear wheel brake main pipe and a wheel speed sensor mounted on the rear axle differential (some may have one on each rear wheel). Two-channel ABS: This type of ABS struggles to balance directional stability, steering control, and braking efficiency, and is rarely used today. Three-channel ABS: It independently controls the two front wheels while controlling the two rear wheels based on the low-select principle (i.e., both wheels are controlled by a single channel, ensuring the wheel with less adhesion does not lock up), also known as hybrid control. Four-channel ABS: Equipped with four wheel speed sensors, it has a separate brake pressure regulator in the pipeline leading to each of the four wheel brake cylinders, enabling independent control and forming a four-channel control configuration.
