Vehicle Infrastructure Integration Experimental Testing System And Safety Control Technology

Transport system is a typical complex giant system.Relying on traditional traffic management from the perspective of roads and vehicles, it is difficult to resolve worsening traffic congestion, accidents, environmental pollutionin recent years. The establishment of transport system integration of people, vehicles and road is based on information exchange between car-car and vehicle-road, which is very important to improve efficiency and security, to achieve sustainable development of transport system. Cooperative vehicle infrastructure system has become the forefront of technology and research focus in the field of Intelligent Transportation System (ITS).Naturally, security is the focus of traffic, traffic safety is always the focus of intelligent transportation system. With the support of science and technology, new construction, operation and management has been establishd. VII system based on advanced sensing and wireless communication technologies, has achieved car-car and vehicle-road real-time information exchange, completed the entire space-time dynamic traffic information collection and integration,which is coming to the new generation of intelligent transportation systems for protecting the safe environment in a complex vehicle traffic, achieving active control of road traffic, and improving network efficiency. Although China has conducted an extensive and thorough research in the field of traffic safety, gained a series of research results, and improved traffic safety situation, without complete information, these technologies can't solve the entire problems of transportation safety. Accordingly, developping intelligent key technology of VII will help us to improve traffic safety condition and supply technical reserves.This paper analyzed the domestic and overseas current research status and the development trend in the field of Vehicle Infrastructure Integration (VII) system. First the whole cooperative vehicle infrastructure system's technology architecture is put forward. Which including vehicle to vehicle/infrastructure wireless communication technology, vehicle movement state information collection technology, vehicle location information collection technology, vehicle surroundings sensing technology, traffic risk analysis, road safety warning and vehicle movement state control, traffic flow detection technology, non-motor vehicle and pedestrian detection, road condition and climate detection, traffic signal control information at intersection, passing safety caution technology, dynamic route guidance technology.The the VII testing system equitments and technology are presented, including on-board Laser Radar, active collision avoidance system based on sonar sensors, on-board infrared sensor system making vehicles travel fast and smoothly along the given route, on-board CCD camera video technology used in vehicle collision prevention and road condition perception, car-bus protocol, on-board gateway system realizing the transformation between the internet protocol and car-bus protocol, Dedicated Short Range Communication (DSRC). Based on on-board condition perception and information transmitting technology, we established a dynamic, road condition perception research plant with a realistic vehicle, testing the method extracting the gray value of road and outboard environment by experiments. The intelligent road-side system inâ…¦system, has a primary role in checking the vehicles'travelling condition, keeping watch over the real-time traffic situation, and providing basic data and information for variety of controlling functions inâ…¦system. The emphasis analyzed in this paper includes, a road-side video detection technology, road-side infrared detection system, traffic volume detection system based on induction coils, Radio Frequency Identification (RFID). Based on the analysis above, we set up a pedestrian security warning system, which is on the basic of infrared detectors, on-board WiFi modules and wireless warning screen. The vehicle to vehicle control testing bed based on Zigbee networks.In the condition of cooperative vehicle and infrastructure system, this thesis researches an efficiency method that detects a dangerous section in order to validate the active warning method can effectively avoid and reduce traffic accidents in dangerous sections. Evaluation method of road safety based on the adaptive resonance theory is proposed to explore black spots. The curve speed warning methods are discussed, including curve modeling method, curve radius measurement method based on ultrasonic, microwave, laser, infrared, GPS and other technology, the calculation method of curve maximum safety speed. Vehicular warning information broadcasting scheme based on vehicle to infrastructure wireless communication is proposed to ensure that the maximum allowable speed of the current road can be calculated and alert the driver to decelerate through vehicle to infrastructure wireless communication before the vehicle is running in the entry of curve, so that the road traffic accidents rate on curve will be reduced enormously.The wireless communication technology, GPS navigation, sensor technology in cooperative vehicle and infrastructure system provides the efficient method for vehicle safety cruising. Vehicle position, state descriptin is the base of vehicle cruising control; this thesis put forward the information exchange graph method based on graph theory. The dynamic topology graph is built for cooperative vehicle and infrastructure system, and the artificial potential field function is used to build the cooperative collision avoidance method and the formation control model. Through the analysising of the routing mehod of information exchange graph, taking into account the vehicle's position and moving direction, an information transmitti ng method based on clustering method is proposed.