With the development of science and technology, more and more attention has been paid to automobile active safety. To say which automobile safety system is strong, we will first think of Volvo, BMW, Mercedes Benz and so on.
As for the anti-collision auxiliary system, there will be differences between each brand, but the functions are mostly the same. Next, we will introduce the anti-collision systems of Volvo, Mercedes Benz and BMW, and test them with specific models of each vehicle to show the effect.
Volvo has always been known for its excellent safety performance and is unique in anti-collision auxiliary system. Volvo’s anti-collision auxiliary system includes two modules: collision warning and city safety.
Collision warning has the ability of simultaneous detection of camera and radar. When it is too close to the vehicle in front or there are pedestrians in the middle of the road, a warning light similar to the brake light will be on to remind the driver to pay attention.
In addition to the collision warning system, Volvo is also equipped with a unique city safety system. The system starts when the speed is less than 30km / h and automatically detects whether there are stationary or moving vehicles within 10 meters ahead.
If the car in front suddenly brakes and the driver does not take any action to the warning issued by the system, the vehicle will automatically brake.
If the relative speed difference between the two vehicles is less than 15km / h, the system can automatically stop the vehicle after starting to avoid collision.
Volvo s60l system name: City Safety
Standard configuration of the whole line
Start condition: open by default;
When the speed is less than 50km / h, it can give early warning prompt and stop completely; Can identify dynamic and static obstacles
Measured score: ★★★★
For the first crash test, Volvo s60l model with standard city safety system was selected.
According to Volvo officials, the system uses laser sensors installed on the windshield to identify obstacles in front of the vehicle, including vehicles and pedestrians.
When the distance between the vehicle and the obstacle is higher than the safe distance, the vehicle will first send out an alarm sound to remind the driver. If the driver does not take measures, the vehicle will automatically brake with all its strength to stop the vehicle.
According to the actual measurement, the speed is 30km / h, and the vehicle starts to slide from about 20m away from the obstacle (both feet are completely on the brake and accelerator). At the position where the front of the vehicle is about 10m away from it, the brake starts to automatically make full emergency braking, the driver’s safety belt is obviously tightened, and the vehicle advances about 0.5m after the front of the vehicle touches the obstacle, and stops completely.
The second time, the vehicle started taxiing at about 25m at the same speed of 30km / h. the vehicle also started Automatic full force emergency braking at about 10m away from the obstacle and tightened the safety belt. Finally, the vehicle stopped completely at about 0.5m away from the obstacle without collision.
On the field left about 1.5 meters, the color is very dark brake mark. It should be reminded that the automatic brake will be fully released a few tenths of a second after the vehicle is completely stopped.
The vehicle may continue to move forward due to inertia, and manual intervention is required at this time.
As a synonym of luxury brand, Mercedes Benz is not willing to be weak in terms of vehicle safety system.
The pre safe and dis safe systems of the Mercedes Benz are equipped.
The Distronic plus system is based on on-board radar sensing. On the basis of active cruise, the system automatically detects the distance from the vehicle in front.
If the vehicle is too close to the vehicle in front, the system will display a warning sign with a warning tone to remind the driver to keep a safe distance. If the vehicle in front brakes, the system will automatically take braking measures until it stops to avoid collision. The pre safe system uses ESP and bas sensors to predict hazards and trigger preventive measures to protect drivers and passengers.
During driving, when there is a slip hazard due to understeer or oversteer, pre safe will start, such as tightening the driver’s and front passenger’s safety belts by an electric retractable safety tensioner.
If the impact cannot be avoided, this function can ensure that the front seat personnel are in the best protective position before the airbag is activated, so as to make the airbag play a better protective effect; The front seat can be restored to the ideal state in advance.
If the seat is too forward and the inclination of the seat back is uncomfortable, the system can adjust it to the best angle. These adjustments are completed by the mechanical device driven by the motor hidden in the seat.
Mercedes Benz gle320 system name: collision prevention auxiliary system enhanced version
Standard configuration of the whole line
Starting conditions: manually open the CPA function, the speed is more than 30km / h, and start the early warning to identify the moving vehicle
Measured score: participation score
This car can choose to turn on or off the CPA function through the buttons on the multi-functional steering wheel. So after getting on the bus, the driver first turned on this function from the menu bar and carried it on the Mercedes Benz gle320
This system is called collision prevention assistance system. The enhanced version can identify mobile vehicles through radar sensing, that is, it will not make any response before evaluating the fixed obstacles set this time.
The same is true of the measured results, so we are participating in this scoring
After Mercedes Benz, we can’t forget BMW. As the mainstay of ABB, the safety technology of cars will naturally be reflected in it.
BMW adopts 360 ⁰ collision prevention system, which is developed based on vehicle positioning and environmental recognition technology. The experimental vehicle of the project is BMW I3 (parameter | picture), which is equipped with four advanced laser scanners to detect the surrounding environment and identify various obstacles.
If the vehicle approaches the obstacle at too high speed, the braking system will automatically start to avoid collision. Finally, the system can accurately stop the vehicle only a few centimeters away from the obstacle.
If the driver changes direction or wants to leave the obstacle, the system will automatically release the brake. This system can reduce the driving pressure of the driver in the environment with poor visibility, so as to improve safety and comfort.
In this process, the driver can intervene at any time to turn off the system.
BMW 740Li system name: enhanced driving assistance system
Standard configuration of the whole line
Starting conditions: the default speed is 50 km / h. warning prompt can be given when starting
Full braking can identify dynamic and static obstacles
Measured score: ★★★★
In the actual measurement, the driver approaches the obstacle at the speed of 30-40km / h, about 2m away from the obstacle, and is located at the front windshield. The herringbone red light will flash continuously, accompanied by the alarm sound to remind the driver of the danger ahead, but will not actively stop. Therefore, when the driver did not step on the brake, the car “mercilessly” hit the obstacle.
In the whole process, a total of 5 similar driving tests were carried out, of which 2 failed to stop successfully in front of obstacles
Any anti-collision system cannot be 100% successful, so what should we think of it?
In fact, we should not ignore that the driving environment of vehicles is ever-changing. Engineers cannot simulate the display environment when designing this program. Therefore, the system will always misjudge. So, is this system not trustworthy?
The answer is, of course, No. In fact, the original intention of the collision prevention system is not to let the car automatically complete the braking action, but to assist the driver. Remember, the key here is assistance.
In many cases, in case of emergencies on the road, people may affect the reaction time due to lack of concentration, but the system can judge first. Then it is only half a second in advance. At the speed of 120km / h, it can also shorten the distance of about 17m, which is actually quite effective.
When setting the anti-collision auxiliary system, some manufacturers set that the vehicle cannot be stopped completely. The purpose is to tell the driver that the final choice of whether to stop or not should be given to the driver, not the car.
The anti-collision auxiliary system of some manufacturers can stop the vehicle, but after stopping, it will release the braking force and return the braking right to the driver. In short, the system only plays an auxiliary role, not to replace the driver’s rights.
We welcome the emerging new technologies, especially in terms of security.
However, it is absolutely wrong for some people to believe that with the guarantee of electronic system, people can relax their vigilance.
After all, the purpose of the system is only to assist the driver at critical times, not to be fully responsible for the active safety of the vehicle. There should be no deviation in this fundamental understanding.
Different brands also have different design concepts and function realization. Volvo and Mercedes Benz adopt radar detection, and there will be an alarm tone before the system takes the initiative to give the driver a reaction time.
BMW uses a more advanced laser scanner, which has a higher recognition of the surrounding objects, but the final parking distance is too short, which will also have some hidden dangers. However, no matter which way, it can not be 100% reliable in practice. In the end, it is necessary to rely on the judgment of the driver to make the ultimate action.
In addition, it is suggested that some people do not experiment with this system again. Taking videos to show how powerful the vehicle is. Even if the shooting is successful, it will mislead consumers.
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