Green and smooth-seamless connection between RFID and bus dispatching system
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Overview
The problem of urban traffic congestion is becoming more and more serious. In the capital, Beijing, more than 90% of the city’s roads are saturated or supersaturated, especially during the morning and evening traffic peaks. Liu Xiaoming, deputy director of the Beijing Municipal Commission of Transportation, said that vigorously developing public transportation can be said to be the only way to solve Beijing’s transportation problems. In recent years, local government leaders and traffic management departments have gradually formed such a consensus: “Developing public transportation is a strategic choice to improve urban transportation.”
Compared with cars, urban public transportation has the advantages of large passenger traffic, relatively low investment, less resources, high efficiency, relatively low pollution, and less road occupation per capita. However, not many people choose public transport to travel. According to a survey in Beijing, 39% of citizens think that the bus speed is too slow, 32% of citizens give up taking the bus because the bus is not on time, and 21% think that the bus dispatching system is lagging, and they often fail to get on the bus or can’t wait for a long time. , Only 8% of people do not want to take public transportation because of comfort and other reasons.
Many cities have introduced GPS bus dispatching systems. However, the signal is severely weakened when high-rise buildings are densely built or when viaducts or tunnels are blocked. In some remote areas, the signal strength is very weak, which will cause the GPS system’s signal to be unstable or even unable to work normally. At the same time, GPS dispatching systems often misreport due to signal interference at bus stations. According to reports, citizens of a newly built BRT system in a certain city in Guangdong often complain about the inaccurate reporting of electronic display screens, and sometimes they may even report farther and farther. In addition, the current domestic GPS system satellite signal sources mainly come from foreign countries. If the transportation system relies too much on GPS technology, once a special event occurs, the domestic GPS application system will face the danger of paralysis.
However, RFID technology does not rely on satellite signals and will not be troubled by the above problems at all. At the same time, the cost is much lower than the GPS system. Since multiple lines passing through the same site can reuse one platform device, the overall implementation of the RFID system (vehicle tag + fixed point) The cost of the signal receiver will also be lower than that of the GPS system (vehicle equipment + base station). In addition, after the implementation of the RFID system, it can also provide value-added services for other social vehicles, which has considerable potential additional economic benefits.
Zhongsheng Hi-Tech has been engaged in research in the field of intelligent transportation for a long time. Aiming at several major problems of the current bus system, such as slow speed, inaccuracy, and lagging dispatching, it has jointly developed the “Ruihang” RFID bus dispatching system with the Oxford University Wireless Communication Laboratory to make up for the current situation. Several major shortcomings of the bus dispatching system, and to achieve seamless docking with the existing system, to minimize application risks and project costs, while facilitating intelligent management of bus vehicles.
system structure
1. “Ruihang” RFID bus priority, speed up the bus
At present, many cities have set up dedicated bus lanes to increase driving speed on the way. However, congestion often occurs at intersections. How to control the traffic lights and give priority to public transportation is a problem that must be solved.
The “Swiss” system installs postcard-sized electronic tags on public transportation vehicles, and adds RFID readers to the existing traffic light control system. It does not need to disassemble the existing traffic light equipment to realize the green and smooth operation of public transportation vehicles.
System workflow
When the bus drives to a place 200 meters away from the intersection, the RFID reading device located near the intersection can collect the information of the bus, and appropriately extend the time of the green light or shorten the time of the red light as needed. Statistics from the traffic management department show that the average signal priority time for each intersection is 8 seconds. Absolute priority is given to some special vehicles in the society, such as fire trucks, emergency vehicles, and police cars. Take the fire-fighting vehicle as an example. Give it a card number with a special electronic tag. Once the fire-fighting vehicle is dispatched, based on the principle of absolute priority, once the tag signal of this special vehicle is detected, the light is absolutely green. Ensure that fire-fighting vehicles can arrive at the disaster relief site as soon as possible. Minimize losses. Cooperating with police cars in this way, emergency vehicles can establish a faster security service system for the city. Further ensure the personal and property safety of residents.
The bus priority system has been adopted in 25 cities including Edinburgh and Leeds in the United Kingdom. Tests have shown that the bus travel time has been reduced by 8% during the morning rush hour. Now, Hangzhou’s BRT has been affixed with an electronic label, and the operating efficiency of the BRT has increased by 60%, and the average speed has reached 40 yards per hour.
2. “Swiss” RFID electronic reporting station to ensure that the bus arrives on time
At present, the most commonly used method of automatic station announcement is the station announcement system controlled by the driver. When the vehicle starts and enters the station, the road conditions are often the most complicated. The driver must start or brake the moving car. At the same time, the operation of the station announcement system must be taken into consideration, which will bring certain safety hazards to the moving vehicles. GPS station reporting systems often misreport due to their low accuracy and susceptibility to environment and weather.
The “Swiss” system basically achieved zero error in bus station announcements by installing postcard-sized electronic tags on public buses and adding RFID readers to stations.
Process
(1) When the bus is approaching the station, the RFID reader installed at the station receives the signal sent by the electronic tag attached to the bus, and it is judged as the inbound phase. GPRS will report the vehicle information, number of passengers, arrival time, etc. The information is transmitted to the bus station dispatching center, and the LED display content of each station is updated at the same time. At the same time, the bus broadcasting system calls the corresponding recording content, and broadcasts “Arrival at XX station ahead, please be prepared for passengers”.
(2) After the car has stopped, open the door, it can be judged as a parking stage, and the recording of “x station has arrived, please get off the passenger through the back door”.
(3) After the car starts with the door closed, it can be judged that it is the start and exit stage, and the “vehicle starts, please stand firm and support”.
(4) After the car leaves the station for a certain distance, it no longer receives the RFID signal. From presence to absence of RFID signal, it can be regarded as the driving stage between stations. According to the code of the station just left, the next station number is judged and “Next station XX” is played.
(5) Repeat steps (1) to (4) when entering the next station.
System Features
(1) Using this system to judge the station and the judgment logic of the driving stage is very simple, and the station number is accurately recognized. It is only necessary to accurately determine whether the station has arrived based on the RFID signal. At the same time, combined with the door opening and closing signal, it can be distinguished. Driving state.
(2) The recognition of arrivals is not easy to make mistakes. Even if there are temporary passengers getting on and off in the station and outside the station, many operations such as opening and closing the door and repeated starting and stopping will not cause the system to misreport and improve the station reporting. Accuracy.
3. “Swiss” RFID fixed-point dispatch to ensure the citizens to ride easily
In view of the poor signal characteristics of GPS bus dispatching in dense areas, tunnels, viaducts, and remote areas, RFID readers can be installed in these places. When the vehicle-mounted radio frequency card enters the transceiver antenna area, the encrypted carrier signal sent by the vehicle-mounted radio frequency card is received by the antenna, and after receiving and processing by the RFID radio frequency card reader device, the acquired vehicle-mounted radio frequency card information is sent to the communication module. The communication module establishes a communication connection with the remote card reader server through the GSM/GPRS/CDMA wireless network, and transmits the received card number, time, and address information to the dispatch center. Aiming at the GPS bus intelligent dispatching management system that has been built in some cities. The use of RFID-based “point positioning” system as a supplement can not only improve the accuracy of vehicle positioning, and improve the operational efficiency and service level of public transit system enterprises. It can also overcome the shortcomings of GPS satellite positioning system in public transportation applications. Reduce capital investment.
At the same time, fixed-point dispatch can play an excellent management role in the parking lot. When a bus enters the parking lot, the ID number issued by the active proximity card on the bus will be automatically obtained by the reader installed at the entrance and transmitted to the background computer for processing. The background computer records and processes this information, and records the vehicle’s ID number. The entry time and vehicle-related information, the background judges which parking space the vehicle should be parked in, and feeds this information back to the LED display at the entrance. The driver can know which parking space and some parking spaces should be parked through the LED display. Additional information, such as the next trip time (this time is the result of automatic calculation by the background computer), etc. When the bus leaves the field, based on the same working principle, the back-end system records the time and other information of the field and writes the records into the back-end database. The management of the entire process eliminates human intervention, minimizes the operating cost of the system and reduces the inevitable losses caused by manual operations.
Company Profile
Beijing Zhongsheng Hi-Tech is a domestic professional Internet of Things and energy-saving products and engineering company. It was established on June 5, 2003. It is a private high-tech enterprise; it has offices in Beijing, Hangzhou, Xi’an, Shanghai, Shenzhen and other places. , Each office has an independent sales, engineering, and technical service team, with a maintenance and technical support network. The company has more than 100 employees and more than 30 R&D personnel. The strong comprehensive strength is a strong guarantee for providing users with high-quality and fast service .
In terms of the Internet of Things, Zhongsheng Hi-Tech has the technical advantage of cooperating with the Wireless Communication Laboratory of the Department of Engineering of Oxford University in the United Kingdom, and has the world’s top technology in Internet of Things sensors. The company is committed to wireless data communication, Internet of Things application services and promotion; develops data collection models that combine software and hardware with independent intellectual property rights; provides wireless data network transmission; establishes industrial-grade wireless sensor networks, environmental monitoring wireless sensor networks, The green wireless sensor network project and the provision of wireless data transmission network products, systems and services for various industrial applications. In energy-saving air-conditioning projects, Zhongsheng Hi-Tech is committed to the practice of environmental protection and energy-saving projects in response to the country’s “Twelfth Five-Year” energy conservation and emission reduction call application. In particular, Zhongsheng Hi-Tech has mature technology and perfect management experience in the design and installation of central air-conditioning systems for ground-source heat pumps and water-source heat pumps, and has an innovative and pioneering spirit in the field of innovation. In the field of investment consulting, it follows the needs of market development to expand into new areas. As the main partner, Zhongsheng Hi-Tech, as the main partner, focuses on obtaining better returns for investors and providing development support for potential business goals.
Beijing Office Address: 24th Floor, Building 3, China Central Place, No. 77 Jianguo Road, Chaoyang District, Beijing
Phone: 010-85872258
Mobile: 13716095357
Contact: Mr. Chang
QQ: 344747536
Website: www.thingstec.com
Mail:[email protected]
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