Trucks have relatively long operating routes and are the most prone to fatigue driving, and are also the most prone to rear-end collisions caused by fatigue driving.
Compared with passenger cars, trucks with AEB as standard will greatly reduce the occurrence of rear-end collisions. What we equip on trucks is generally called AEBS, which is actually the same as AEB, just with a different name.
So, what is AEBS? Let’s talk about it in this article today.
AEBS is the Active Emergency Brake System (Autonomous Emergency Brake), which we generally call active braking or automatic emergency braking. The AEBS system is a very important function in active safety. It can reduce the probability of rear-end collisions and collisions caused by driver distraction, fatigue driving, etc.
With the help of AEBS, within the effective speed set by the AEBS system, when we face parked vehicles on the road, pedestrians or vehicles crossing the road, or vehicles in front that suddenly slow down, or when we are fatigued and fail to keep a safe distance from the vehicle in front, and are about to collide.
When our driver fails to brake in time, the AEBS system will help us brake, in this way to reduce the occurrence of collision accidents during driving.
AEBS is generally not equipped on a vehicle alone, but is usually integrated with the ADAS (Advanced Driver Assistance Systems). In addition to AEBS, this system also integrates LDWS (road departure warning system) and ACC (adaptive cruise control).
The AEBS (Auto Emergency Braking Systems) emergency braking system uses radar to identify the relative speed and distance of the vehicle in front. When the ECU determines that there is a risk of collision between our vehicle and the vehicle in front, the system controls the engine and braking system to reduce the speed until the vehicle stops to avoid collision, thereby reducing damage.
● So, how does AEBS work?
The AEBS system is designed based on the logic of “perception”, “decision-making” and “execution”.
For a better understanding, we can think of it as human “eyes”, “brain” and “hands and feet”. For example, if we want to pick up an apple on the table, we must first have the consciousness of picking up the apple in our mind, then find where the apple is through our eyes, and then use our brain to judge whether we can get it and how to get it, and finally use our hands to get the apple.
The perception level is like the eyes, which are used to see. The AEBS system generally uses sensors such as radars and cameras to observe the road conditions at any time to detect pedestrians, non-motor vehicles, static and dynamic vehicles.
The decision-making level is like the brain, which is used to think. The ECU is used to judge the information obtained by the sensor, such as our relationship with the vehicle in front, whether braking measures need to be taken, etc.;
The execution level is like hands and feet, which are used to do things. Through EBS, ESC, brakes, etc., the electronic signals from the ECU are converted into specific actions to achieve the deceleration of the vehicle.
The work of the AEBS system is mainly divided into 4 parts
The first stage: the target is detected
In the first stage when the AEBS is triggered, although the system will detect the target, the system will not respond, and the default driver may find the target and take action;
The second stage: collision warning: sound and light
In the second stage of AEBS triggering, the sound and light alarm will be activated to remind the driver that a collision may occur, and the driver needs to take braking action. At this stage, the driver must take stronger braking to avoid a collision;
Stage 3: Collision warning: sound, light and touch
In the third stage of AEBS triggering, the sound and light alarm will continue to alarm to remind the driver, and a short instantaneous emergency braking will be performed to remind the driver to take braking action from the touch, and the engine will start torque limitation to slow down the vehicle.
In this stage, the driver must take full braking or evasive action to avoid the occurrence of a collision.
Stage 4: Automatic full braking
In the fourth stage of AEBS triggering, the sound and light alarm system continues to alarm, the engine starts torque limiting to slow down the vehicle, and the brake system is activated to perform automatic right braking to avoid or mitigate the occurrence of a collision.
At this stage, the driver can no longer avoid the collision manually.
It is particularly important to note that due to the constraints of external factors such as road friction coefficient, tire tread depth, cargo loading, and vehicle technical conditions, the AEBS emergency braking system cannot 100% avoid collision accidents within the set emergency braking range.
● Postscript:
AEBS is an auxiliary safety function that can reduce or even avoid collision accidents, so I think AEBS should be a mandatory standard configuration on trucks.
Of course, the AEBS system is not omnipotent. Due to the vehicle technology itself, weather factors, road factors, vehicle speed, vehicle weight, etc., AEBS cannot 100% avoid collision accidents. Therefore, even if our vehicle is equipped with an AEBS emergency braking system, we must always be vigilant during driving.
