In many accident videos, we often see such accidents. In a crowded traffic environment, a vehicle is very close to the vehicle in the next lane, but it changes lanes directly, resulting in the vehicle in the next lane directly hitting the vehicle changing lanes. After seeing such videos, many people will condemn the malicious lane change of vehicles, which affects traffic safety. However, in the actual driving environment, many drivers will check the vehicles behind them through the rear-view mirror before changing lanes. However, due to the blind area of the vehicles, when only looking at the road conditions through the rear-view mirror, the vehicles in the next lane may not be directly observed, resulting in the above-mentioned malicious lane changing accidents. In addition, under special weather conditions such as heavy rain, heavy fog and dim lights at night, It is more difficult to observe the vehicle behind through the rearview mirror, which will create a larger blind area and make the driving process more dangerous.



The so-called car blind area refers to the part of the area where the driver’s line of sight is blocked by the car body and cannot be observed directly when he is in the normal driving position. In short, when the driver is sitting in the cab, the area that cannot be observed is the blind area. Generally, the blind area is divided into the blind area inside the car and the blind area outside the car. The blind area inside the car mainly includes four visual blind areas and some artificial blind areas, The blind area outside the vehicle mainly refers to the blind area caused by fixed or moving objects and light problems. Different models encounter different sizes of blind areas.



The four visual blind areas in the vehicle are mainly: front blind area: the blind area caused by the shielding of the engine compartment, which is mainly related to the body height, seat height, front length, driver’s figure, etc; Rear blind area: it mainly refers to an area of about 30 degrees from the rear door to the outside. When the front of the rear vehicle is near the rear door of the front vehicle, the rear incoming vehicle can not be observed in the reflector of the front vehicle, which is very prone to scratching and rear end collision accidents; Blind area of rear-view mirror: the rear-view mirror of the vehicle can only see both sides of the vehicle body, and can not fully collect all the information around the vehicle body; AB pillar blind area: the AB pillar of the vehicle will also produce a blind area;

With the development of automobile technology and the increasing popularity of advanced driving assistance systems, the driving process of drivers has become safe and convenient, such as lane offset assistance system, lane keeping assistance system and automatic parking system, which provide more security for drivers. When drivers are distracted during driving, These advanced assisted driving systems can give the driver reminders and active assistance to a certain extent. As a popular function in many brands of vehicles, the vehicle lane change early warning system can well eliminate the blind area caused by some drivers only observing the rear vehicles through the rearview mirror, so that the driver can predict the possible dangers in advance.

The vehicle lane change early warning system, referred to as BSD, as an advanced auxiliary driving system, mainly uses millimeter wave radar as the detection device to continuously detect the side and rear blind areas of the vehicle during vehicle driving, and can detect the current position, driving speed, driving direction and other information of other vehicles in the next lane within a certain range. If other vehicles or pedestrians enter the blind area, the vehicle lane change warning system will remind the driver through sound and light to avoid the possibility of danger due to the driver’s failure to observe the lane change of vehicles behind. Since the vehicle lane change warning system mainly uses millimeter wave radar as the detection device, it can be used all day, work normally in the day, night, fog, snow, heavy rain and other weather, adapt to more scenes and weather, and monitor multiple targets 0.3m ~ 15m on both sides of the vehicle in an all-round way. The vehicle lane change warning system has been very popular at this stage and has been applied to many brands of vehicles. As an advanced auxiliary driving system that has been commercialized and is responsible for driving safety, it will have a great impact on the development of automatic driving. The premise of automatic driving is that the vehicle can independently identify the traffic conditions and make timely adjustments to the speed and direction of autonomous vehicle, Lane change will also be a common problem in the working process of autonomous vehicle. How to make lane change safer? Here, we can discuss the two development schemes of single vehicle intelligence and vehicle road coordination. Due to the differences between the two automatic driving landing schemes, it will also affect the development direction of vehicle lane change early warning system:

Lane change under single vehicle intelligence

Under the development mode of single vehicle intelligence, the perception, planning and decision-making of automatic driving are all determined by the autonomous vehicle itself. When the vehicle needs to change lanes or finds that the vehicles in the next lane need to change lanes, it needs the vehicle itself to make decisions and make corresponding actions. This requires high hardware equipment on the autonomous vehicle. Lane changing is a high-frequency action during vehicle driving, It also needs to be able to deal with lane changing behavior under various road conditions. The vehicle lane change warning system, as an advanced auxiliary driving system to assist the driver in driving the vehicle and reduce the blind area, will change from passive warning to active assistance, from blind area monitoring to full range monitoring of the surrounding traffic environment after the popularity of autonomous vehicle. During the driving process of the autonomous vehicle, the vehicle lane change warning system can continuously detect the vehicles around the autonomous vehicle. When it detects that other vehicles or pedestrians are driving nearby, it can enable the autonomous vehicle to adjust the speed and direction in time and monitor in real time until other vehicles or pedestrians leave the influence range of the autonomous vehicle.

Lane change under vehicle road coordination

Under the development mode of vehicle road coordination, vehicles communicate with vehicles, vehicles with roads, vehicles with people and other roadside devices. Each vehicle participating in the traffic is not an independent individual. The driving path and actions to be performed by autonomous vehicle will communicate with surrounding traffic participants in real time. When autonomous vehicle need to change lanes, surrounding vehicles will obtain relevant information in advance and adjust their driving behavior in advance, At this time, the vehicle lane change warning system is a redundant role, but it will still change from blind area monitoring to full-scale monitoring of the traffic environment around the vehicle. When the autonomous vehicle changes lanes, it monitors the traffic environment around the autonomous vehicle, but it will not be the main source of information perception. With the development of automatic driving, more and more advanced auxiliary driving systems will be further developed. What other advanced auxiliary driving systems do you want to know? Welcome to the forefront of intelligent driving and leave a message!

Leave a Reply

Your email address will not be published. Required fields are marked *