What is the function of the ABS system?
2 Answers
The functions of the ABS system include: Maximizing the effectiveness of the brakes, reducing braking time and distance; effectively preventing vehicle skidding and fishtailing during emergency braking, ensuring good driving stability; allowing steering during emergency braking, providing excellent steering control; avoiding severe friction between the tires and the ground, reducing tire wear. During braking, the ABS system quickly determines the wheel lock-up state based on the speed signals from each wheel speed sensor. It closes the normally open input solenoid valve for the wheel that is beginning to lock, maintaining the braking force. If the wheel continues to lock, the normally closed output solenoid valve is opened, causing the braking pressure on that wheel to drop rapidly due to the direct connection to the brake fluid reservoir, preventing the wheel from completely locking due to excessive braking force. This keeps the braking state at the optimal point (slip rate S of 20%), achieving the best braking effect and ensuring driving safety.
The ABS (Anti-lock Braking System) is incredibly practical, especially on slippery roads I've experienced. One winter when driving, the road had a thin layer of ice, and suddenly the traffic light ahead turned red. I slammed on the brakes and felt the system rapidly pulsing the brakes on the wheels. The car didn't skid, and I could still steer normally, coming to a smooth stop right before the stop line. Without ABS, the wheels would have locked up completely, causing the car to lose control and slide sideways, potentially hitting the curb or another vehicle. ABS uses sensors to monitor wheel speed, and when it detects impending lock-up, the electronic control unit immediately adjusts brake pressure to maintain rolling friction with the road surface, helping the driver maintain control during emergencies. It also significantly reduces braking distance and improves overall safety. Nowadays, when buying a car, I always prioritize checking for this feature—it's one of the most fundamental safety configurations. It gives me much more peace of mind during rainy days or sudden braking. I recommend regularly checking the system indicator light to ensure it's functioning properly.
