Anti-Lock Brake System

When the brake pedal is pressed during driving, the wheels can lock before the vehicle comes to a stop. In such an event, the maneuverability of the vehicle is reduced if the front wheels are locked, and the stability of the vehicle is reduced if the rear wheels are locked, creating an extremely unstable condition. The ABS precisely controls the slip rate of the wheels to ensure maximum grip force from the tires, thereby ensuring the maneuverability and stability of the vehicle. See Fig 1 for views of ABS components.

The ABS calculates the slip rate of the wheels based on the vehicle speed and the wheel speed, then it controls the brake fluid pressure to reach the target slip rate. See Fig 2 .

Fig 1: Locating ABS Components

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 2: Identifying Calculation Of Vehicle Slip Rate

Courtesy of AMERICAN HONDA MOTOR CO., INC.