Electronic enthusiasts: during driving on the highway, look down at the mobile phone text message, just a few seconds, the car's emergency automatic braking system will sound an alarm, when your eyes return to the front of the road, your car will immediately It is about to hit the tail of the decelerating freight truck in front. This thrilling and thrilling scenario was the scene used by the US Department of Transportation in the last six road tests in California with eight automakers including Ford and GM in early 2012.

This test is the actual road test conducted by the US Department of Transportation for a new generation of vehicle communication technology developed by multiple car manufacturers. The purpose is to verify whether the system can reduce the occurrence of traffic accidents, thereby saving lives and improving traffic conditions. According to the investigation report of the National Highway Traffic Safety Administration, 80% of road accidents are caused by the driver's negligence within 3 seconds before the accident.

An experiment by Daimler-Benz showed that if the driver is alerted 0.5 seconds in advance, 60% of rear-end collisions can be avoided; if the driver can get the warning 1.5 seconds earlier and take measures, 90% of rear-end collisions can be avoided . The new-generation vehicle communication technology mentioned above refers to the automotive communication network WAVE (IEEE802.11p). This technical term that appears to be professional and advanced is not difficult to understand. The full name of WAVE is WirelessAccessintheVehicularEnvironment, which means a communication protocol for wireless access in the automotive environment. From the protocol code named at the beginning of IEEE, we can see that the protocol has become an industry standard, that is, the "Internet of Vehicles" we often hear.

The generation of any technology is meaningless if there is no actual application scenario, and WAVE is no exception. At present, the technology is mainly used in two main application areas at the application level, one is V2V (VehicletoVehicle) system, that is, vehicle-to-vehicle communication The system, referred to as the workshop network, can achieve high-speed data exchange between vehicles. The other is the V2X (VehicletoInfrastructure) system, that is, the vehicle-to-road infrastructure communication system, or vehicle-road network for short, which can realize the communication and two-way data exchange between the vehicle and the standard intelligent transportation system (ITS) roadside infrastructure of the specified wave band. In the V2V system, each car must use a agreed standard way to broadcast the information of the vehicle-to-vehicle communication, but the specific display of the information is not limited, which gives the car manufacturer a great play space. The design of these systems is actually an art, and the eight major car manufacturers involved in V2V system research and development and road testing are also magical in this regard. For example, when you are about to cross an intersection, there is a car that wants to overtake from your right. The Acura TL model will display a yellow prompt message above the odometer; and the system developed by Ford will be on your A red light flashing from left to right on the windshield reminds you, and to ensure that you can get the reminder, your seat will also tremble from left to right. Practical tests have shown that the most effective alarm strategies are audible alarms and tactile alarms. The combination of the two is the most reasonable and widely adopted. Since the driver ’s vision is directly in front of the road while driving, he is already receiving a lot of information, and the burden of the auditory system and haptics is lighter, so the driver ’s response to vibration or brake recordings is more than that indicated by the indicator lights on the dashboard. The response is more sensitive. In these tests, without exception, all car manufacturers designed systems to use sound as the most urgent alarm, such as the warning of a crash. Other, less important reminders, such as information that a car is accelerating from another lane, are usually visually reminded and displayed on the dashboard, windshield, or rearview mirror.

Excitingly, with the completion of this test, the US Department of Transportation decided to conduct a full-year field trial in the next six cities in the United States. Nearly hundreds of thousands of cars, trucks and buses will be equipped with V2V systems. Through the pilot results, the US Department of Transportation will decide whether to force automakers to install V2V communication systems for all new vehicles in recent years in 2013. If the government requires auto manufacturers to start installing V2V systems on all vehicles, the first batch of cars using this technology is expected to be available around 2018. According to General Motors, the price of the V2V system will be about 208 US dollars (about 1579 yuan). In the past, in order to reduce and avoid traffic accidents, automotive design engineers have been looking for ways to design the best anti-lock braking system and emergency brake assist system to improve the driving stability of the car, and configure the vehicle with a three-point seat belt , Airbags and other passive safety facilities to strengthen the protection of occupants.

Although these methods have protected people's safety and even saved their lives countless times in the past, they are not the only way to solve the problem of safe driving, nor are they the characteristics that future cars should have under the rapid development of technology. The birth of the V2V system just gave a new solution, because this active safety system can make the car more "smart" and more "smart." The V2V system is like giving life to the car, giving these machines the ability to "speak and talk", you can say to other cars: "Dude, be careful, don't hit me with it!" "Don't stop at!" Point, there is an accident ahead, I will slow down. "If V2V gives cars the ability to communicate with each other, then V2X can be regarded as giving cars the ability to perceive the environment. The V2X system can communicate information with any compatible infrastructure equipment installed on or near the road, allowing drivers to respond in a timely manner when their sight is blocked by large vehicles or obstacles ahead. For example, installing the device at a dangerous corner, once the vehicle approaches the corner at high speed, a smartphone equipped with a V2X application system will send a warning signal to the driver. The roadside equipment can also mark the location of the road construction area. When the vehicle enters the area, the system will send suggestions to the driver and receive the driving information of other vehicles in the construction area. The system can also notify the vehicles in the rear of the road surface in time. When the vehicle encounters a pit on the road, the suspension system can determine the degree of damage to the pit by measuring the depth of the depression.

Therefore, when the front-facing vehicle encounters a pit, the location and damage degree of the pit will be transmitted to the rear vehicle within the communication range at the same time. After the driver of the vehicle is prompted, he can choose to avoid in advance or pass quickly according to the actual situation. What is the difference between this system and the active safety system developed by many car manufacturers at this stage?

At present, Volvo Cars is proud of the urban safety system that uses a laser sensor installed on the top of the windshield to monitor the road ahead and can detect objects within 10 meters in front of the vehicle ’s bumper. When the vehicle speed is less than 30 km / h, if the driver does not respond to the object in front too close, such as stepping on the brake, the system will automatically brake the vehicle when it judges that there is a danger of an impending collision. One of the biggest problems with this type of technology is the short detection range of the sensor, which can only play a role when the car is driving at a low speed. The V2X system can extend the warning distance farther, and can synchronize with the surrounding environment within the coverage area through camera sensors and dedicated short-range communication roadside equipment. It uses a satellite navigation system to locate the location coordinates of the vehicle, and wirelessly transmits road conditions and vehicle information to different vehicles in the surroundings through a dedicated short-range communication technology.

Network Cabinet is widely used for 19 inch network server enclosure perferated cabinet  installing and placing of 19" international standard equipment and the system integration.  Network Cabinets support large, modular network switches by providing additional space for cable management and side-to-side airflow solutions.

Network Cabinet

Network Cabinet,Electrical Cabinets,Wall Mount Server Cabinet,Wall Mount Server Cabinet,Wall Mount Cabinets,Electrical Distribution Cabinets

Sijee Optical Communication Technology Co.,Ltd , https://www.sijee-optical.com