car’s braking performance is one of the major car’s performance, major traffic accidents often associated with the braking distance is too long, the situation sideslip occurs when the emergency brake related, so the car’s braking performance is an important safe driving car protection. Currently ABS anti-lock braking system has been widely used in the car. What is ABS? Understand its advantages and limitations contribute to safer driving.
1.ABS term anti-lock braking system of interpretation
car’s braking performance is one of the major car’s performance, major traffic accidents often associated with the braking distance is too long, the emergency system sideslip situation occurs when moving about, so the car’s braking performance is important guarantee for safe driving of the car. Currently ABS anti-lock braking system has been widely used in the car. What is ABS? Understand its advantages and limitations contribute to safer driving.
Principle
2.ABS the
ABS is the abbreviation of the anti-lock braking system, the English name is Anti-lockBrakingSystem, or Anti-skidBrakingSystem. The system can automatically adjust the wheel braking force during braking, preventing the wheels from locking in order to obtain optimum braking.
a vehicle braking performance is good or bad, mainly from the following three evaluation: 1, braking performance, i.e. the braking distance and the braking deceleration; 2, constancy of braking efficiency, i.e., or thermal decay properties of water; 3, vehicle directional stability during braking, i.e. when the vehicle is not braking deviation occurs, sliding properties and loss of steering capability.
Generally, the presence of cars during braking resistance are two: one kind of frictional resistance is generated between the brake lining and brake drum or brake disk, this resistance is called braking system resistance, because it provides a braking force during braking, it is also known braking system braking force; the other is frictional resistance is generated between the tire and the road surface, the tire is also referred to – road adhesion. If the brake system braking force is less than the tire – road adhesion, the car will remain stable during braking, on the contrary, if the braking force is larger than the brake-based tire – road adhesion, the car wheel lock during braking occurs and slip.
If the front wheels locking, cars traveling along a substantially straight ahead, the vehicle is in a steady state, but the loss of steering control car, and the driver’s braking avoid obstacles, pedestrians as well as on a bend steering control necessary to be taken can not be achieved. If the rear wheels lock braking stability of the car is deteriorated in small lateral force interference, cars drift occurs, even a U-turn and other dangerous phenomena. Especially in some bad road conditions, such as snow or slippery road surfaces, wheel lock will be difficult to ensure traffic safety vehicles. anotherIn addition, since the wheels from locking during braking, causing a sharp local friction, it will greatly reduce the life of the tire.
ABS by controlling the brake line pressure acting on the wheel brake cylinder, so that the car in emergency braking without locking the wheels, so that the car can remain relatively during emergency braking good directional stability. In the car is not equipped with ABS, if the brakes in the snow, the car is easy to lose directional stability; at the same time if you want to stop the driver, you must use the hydraulic actuator (also called actuators). Conversely, if the car is equipped with ABS, the ABS can automatically issue control commands to the hydraulic actuator, and thus more quickly, accurately and efficiently controls the brake. Advantage
3.ABS the
ABS function is achieved by adjusting, controlling the brake line pressure to prevent the wheel brake during the locking the slip, the slip ratio is set in motion so that 15% -25% of the piping side slip. Advantages are as follows:
1 improved lateral stability during braking cars;
2 directions improve maneuverability during braking cars;
3 system improvement.. dynamic performance;.
4 reduce localized excessive wear of the tire;.
5 easy to use and reliable.
4.ABS limitations
In both cases, ABS braking system can not provide the shortest distance.
1. A dry in a smooth way, braking by the driver is directly experienced.
2. Another case is braking on loose gravel, loose soil or deep snow road pavement. Further, usually a dry road surface, the latest ABS system can slip rate control in the range of 5% to 20%, but not all of the ABS are at the same rate or the same degree of braking (or abandonment brake).
a ABS system, no matter how perfect, it still can not get rid of certain physical laws. Although four anti-lock braking system allows the car to brake in the shortest possible distance, but if braking were too late, so they can not come to a complete stop before colliding with an obstacle, they can not prevent accidents . However, the four anti-lock braking system retains the ability to control steering, therefore, possible to bypass obstacles, to avoid accidents that may occur during braking. Another case where the ABS system is not contrary to the laws of physics that when the vehicle is traveling on a bend, its speed exceeds the allowable speed of physics, in this case, even if the ABS system can not prevent the car leaving the centrifugal force corners. However, ABS system allows the car to reduce the speed and reliable steering in the process, thus reducing the risk of possible collisions. Also considered is the case of the road surface. When not equipped with ABS braking system of the car on slippery surfaces or snow road, the braking distance is longer, and can not turn violent; as well as in the automotive equipment ABS system, because although ABS can provide additional braking control and steering control, but it does not solve such an objective physical fact that on slippery roads, the available traction is small. [1twenty three]