Text/Civil
With the development of the automobile industry, the vehicle is no longer the first few layers of iron can be opened, but as a driving tool that needs to be fully taken into account in terms of control, comfort and safety. And safety is an important consideration for consumers when buying a car, then it requires car companies to pay more attention to safety, and there are also results at present, such as many active safety functions are already standard.
Although many models are equipped with abs and other functions as standard, many consumers do not know much about the role of these functions, but in fact, they may have helped you overcome the danger many times. For example, the most basic ABS function.
What is the ABS feature?
ABS is an abbreviation for the English Anti-locked Braking System, Chinese translated as "anti-lock braking system". Its role is to keep steerable and reduce the braking distance during braking. During the braking process, through the monitoring of the wheel speed, speed and slip rate of each wheel, the vehicle can stop at the shortest distance while avoiding wheel locking, so that the vehicle braking distance is reduced, and the steering ability is lost due to emergency braking caused by front wheel locking, or the rear wheel is unstable.
Under what circumstances does the vehicle trigger ABS?
The tires are empty when the vehicle brakes in situations such as potholes, or the vehicle has a tendency to hold the emergency brake wheels on normal roads, which will lead to an increase in the vehicle slip rate (slip rate refers to the proportion of the sliding component in the movement of the wheel, that is, the ratio of the difference between the speed of the car and the speed of the wheel to the speed of the car). When the vehicle slip rate and speed reach a certain value, the vehicle will trigger the ABS function.
What was the intervention and rollout of ABS control?
During the driving process, the driver presses the brake pedal, the wheel cylinder pressure increases, when the wheel speed and wheel slip rate meet the ABS activation conditions, the ABS function intervenes, and the wheel cylinder pressure is adjusted until the driver releases the brake pedal or the vehicle wheel speed and slip rate meet the ABS exit conditions, the ABS function exits, and the entire control process ends.
Expand the details:
If the vehicle without ABS encounters emergency braking, if the brake is stepped on to the end, it will be found that it is impossible to steer at all, which is called wheel locking.
Serious tires can be smoked and scrapped, but this is only secondary, the most important thing is that the car is easy to lose control after the wheel is held; if the front wheel is locked, it will directly lose the steering ability, the steering wheel cannot be controlled, the vehicle rushes straight forward, if there is a car in front, it is a serious traffic accident.
If the rear wheel is locked, although it can be steered, but there will be a situation of rear wheel side sliding, serious words is direct tail swing, at high speed, side slip and tail flick will directly make the vehicle out of control, turning or rolling over are extremely dangerous.
The intervention of the ABS system is equivalent to the fact that when emergency braking is carried out, the front wheels will not be locked, the steering ability will still exist, the rear wheels will not be locked, and there will be no side slip and tail flicking, which can enhance the control of the body and reduce the probability of accidents.
The principle of shortening the braking distance is that if the wheel is locked, the wheel and the ground belong to the sliding friction, and after the ABS acts, the friction between the wheel and the road surface becomes rolling friction, which belongs to the case of rolling and sliding, so as to ensure that the adhesion of the wheel and the ground is at the maximum value to improve the braking deceleration and shorten the braking distance.
ABS works equivalent to point braking at a high frequency, because the brake master pump is constantly adjusting the braking pressure, so that there is a continuous feedback force on the brake pedal, the brake pedal has a significant flutter, and all the driver has to do is to keep pressing the brake pedal until the danger is lifted.
Of course, ABS is not a panacea, the road conditions are particularly bad, ABS is also powerless, the road conditions are particularly good, ABS will increase the braking distance.
expand:
ESP (Body Stability System) is a feature that is further upgraded on the basis of ABS, mainly by controlling the engine and brakes to correct the vehicle's tendency to lose control. Engine control is to limit the throttle opening to avoid outputting too much power and making the drive wheels slip. The control brake is that ESP will apply different braking forces to the four wheels according to the dynamics of the vehicle, and apply a deflection torque to the body through the traction force of different sizes on the four wheels, correcting the possible loss of control or recovering from the loss of control. Similarly, ESP is not a panacea, it can only be effective if it acts on the ground through tires, and if it exceeds the physical limit, it is useless, such as ultra-high-speed cornering.
summary:
ABS function is in the emergency braking and other situations can ensure the vehicle's steering and control of the braking distance system function, its trigger and exit are judged by the system, can help the driver in dangerous situations to improve the handling of the vehicle, so it is a very necessary function, ESP (body stability system) is upgraded on the basis of ABS, the same is to strengthen the body control of dangerous situations, but life safety can not be completely handed over to these safety systems, their own safe driving is the most important.