What role does the ABS system play during emergency braking of a motor vehicle?
1 Answers
The role of the ABS system during emergency braking of a motor vehicle is to: fully utilize the effectiveness of the brakes, shorten braking time and distance; effectively prevent vehicle skidding and fishtailing during emergency braking, ensuring good driving stability; allow steering during emergency braking, providing excellent steering control; avoid severe friction between the tires and the ground, reducing tire wear. ABS, short for Antilock Brake System, functions by automatically controlling the braking force during vehicle braking to prevent wheel lock-up, keeping the wheels in a state of rolling and sliding (with a slip ratio of about 20%), ensuring maximum adhesion between the wheels and the ground. During braking, the ABS quickly determines the lock-up state of each wheel based on the speed signals from the wheel speed sensors, closing the normally open input solenoid valve for the wheel that begins to lock up, maintaining the braking force. If the wheel continues to lock up, the normally closed output solenoid valve is opened, causing the braking pressure on that wheel to rapidly decrease due to the direct connection to the brake fluid reservoir, preventing the wheel from completely locking up due to excessive braking force. This keeps the braking state at the optimal point (with a slip ratio S of 20%), achieving the best braking effect and the highest level of driving safety.