"ABS"(Anti-lock Braking System) Chinese translated as "anti lock brake system". It is the auxiliary technology of conventional brake device, can be divided into mechanical and electronic type two. It makes the brake system with braking function at the same time, but also to prevent wheel lock, the automobile can still turn under braking condition, ensure the brake directional stability of the vehicle, preventing side slip and deviation.
The world's first ABS came out in 1950, was applied first in the field of aviation aircraft, beginning in 1968 in automotive applications. And now, the basic safety equipment ABS already belongs to general models.
When emergency braking or on ice snow road and other low attachment coefficient road when braking, because the maximum braking force exceeds the adhesion ability of the pavement to offer, between the wheels and the road surface rolling skidding wheel locking tendency, tendency. Locking the wheels will lose lateral adhesion ability, can't bear the lateral force, general front locking caused the car lost steering capability, locking the rear wheel will cause the car swerves, instability.
Then ABS according to the wheel angular velocity signal, the calculated speed, the wheel angular deceleration, the wheel slip rate; on the basis of the above information, the ABS in the wheel tends to lock when reducing the braking force, the wheel angular deceleration or slip rate to maintain the braking force in a certain range, the wheel speed increased after the restoration of replication dynamics. The actuator is very rapid, so seemingly point put the brakes. Vehicles equipped with ABS in the use of brakes, brake pedal causes vibration of the upper and lower. But this is a normal phenomenon.
The average driver in the face of an emergency situation, often because of the tense hard brake trampled to death, if there is no ABS control braking action, the tire will generally because the brake strength is too large and the locking and sliding. Reaction ability general driving usually too late to correct control of the brake force, but ABS has the ability to control each individual wheel braking action, close to the ideal. ABS is not only to reduce the vehicle braking distance and braking distance in some cases even increased, its main purpose is the vehicle completely in a controlled state in the brake process, and not because the tire locking the vehicle out of control.
On Asphalt Pavement in general, especially in wet conditions, ABS can improve vehicle braking action, can shorten the braking distance. In the soft sand, snow on the road, for example, ABS will increase the braking distance. Because in this case the wheels will lock and the formation of extrusion surface uplift, and then into a mound, and the use of ABS vehicles can be easily crossed with a way of reducing the uplift. This causes the ABS control of the vehicle can move more quickly or snow in the field. ABS can enhance the vehicle in a variety of situations in handling, general driving in the braking process will still be able to bypass the obstacles, which in the absence of ABS in general driving is almost completely impossible, which can greatly enhance the driving safety.