The vehicle video surveillance terminal is another important in-vehicle electronic device necessary for the bus, and its technical development has begun to integrate the functions of the intelligent dispatching terminal. The CPU processing performance of the car DVR has been rapidly improved. The new car DVR integrates satellite positioning function, 3G wireless data transmission, voice automatic report station, driving information recording, and lower door display based on the original recording function.
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Intelligent public transportation and vehicle video equipment are gradually showing the direction of integrated development. This paper discusses the technical development status and future prospects of integrated public transportation vehicle electronic information terminals.
First, the development status of public transportation vehicle electronic equipment
At present, the bus electronic equipment mainly includes: GPS terminal, computer station, lower door display, car DVR, driving recorder, LED display, IC card POS machine and other terminal equipment, and is provided by different manufacturers. . Various terminals operate independently, and it is difficult for them to communicate with each other, resulting in complicated electronic products on the bus, difficulties in installation, maintenance and troubleshooting, and inconvenience to operators.
The earliest exploration of the intelligent bus and car video integrated machine in China is the local standard “SZDB/Z 30—2010 Bus Intelligent Dispatching System Vehicle Dispatching Terminal†issued by the Shenzhen Bus Dispatching Terminal in 2010, the first time in the form of standard The bus dispatching terminal and the car hard disk recording function have unified requirements. The standard content includes bus intelligent dispatching, 3G video recording monitoring, data transmission protocol, peripheral interface requirements and so on. The standard requires on-board hard disk recorder manufacturers and intelligent bus dispatching manufacturers to implement video surveillance and intelligent scheduling functions respectively, and network transmission is implemented by an external wireless router. With the promulgation of the standard, many manufacturers have integrated the in-vehicle electronic equipment according to the requirements of the standard, forming the first generation of public transport integrated machine products.
Second, intelligent bus and car video integrated machine design
1, program design and block diagram
The bus integrated machine integrates the functions of various in-vehicle electronic devices, unifies the power module to supply power, and shares the wireless communication module with the central platform for data interaction. The all-in-one machine can replace the traditional bus car GPS terminal, dispatch display terminal, lower passenger door display, car DVR, driving recorder and LED controller, etc., and also can access bus IC card POS machine, various vehicle sensors, Vehicle peripheral bus and other related peripheral products. As shown in the figure below, the left side of the block diagram is the function item of the bus integrated machine, and the right side is the other electronic equipment in the bus that may be docked.
Figure 1 Block diagram of the bus integrated machine 2, the composition of the integrated machine and the description of each module
The bus integrated machine is mainly composed of: the vehicle power module, the arithmetic processing module, the network transmission module, the control display unit and the like.
(1) Vehicle power module
At present, buses mainly have 12V or 24V power supply vehicles. According to GB/T 21437 and ISO7637 technical standards, the integrated machine needs to have wide voltage input, high power regulated output, high efficiency on-board regulated power supply module, and support the whole machine. normal work.
(2) arithmetic processing module
The arithmetic processing module is the core of the device. It is responsible for collecting various data such as video and audio data, GPS data, vehicle body signal data, driving information data, etc., providing support for large data volume computing capabilities, and analyzing, integrating and processing various types of data. Realize monitoring the operation of public transportation vehicles, and store video recording, positioning data, driving data and so on in the storage medium.
(3) Network transmission module
The network transmission module is responsible for data interaction between the terminal and the central platform, and uses the operator's 3G wireless digital network technology to deliver the central command information to the vehicle intelligent information terminal, and can collect the video and audio data, vehicle operation data and other buses. Various data is uploaded to the central platform.
(4) Display control unit
The display control unit acts as a human-computer interaction interface with a large-size color LCD display and physical function buttons. The bus driver can obtain various rich information prompts such as date, time, real-time vehicle speed and speed limit value, line information, site information, scheduling information, etc. from the LCD screen, as well as the lower gate screen, rear view screen, and various roads. Video surveillance screens, etc. And it can realize the control of the vehicle terminal through the button operation, such as reporting station, service word broadcast, driving event report and the like.
Third, the advantages of intelligent public transport and car video integrated machine technology
1. The overall solution design replaces the traditional various vehicle terminals.
(1) Convenience of installation and maintenance
The bus integrated machine can replace the traditional bus-mounted multiple electronic products, and has the characteristics of small footprint, easy installation and maintenance. It can be placed in the original lower door display position, which is convenient for equipment installation and maintenance. The single terminal design also facilitates the troubleshooting and processing of fault points.
(2) Integrated design plan to control costs
The design of the bus integrated machine integrates a variety of different types of terminal products on traditional bus vehicles, shares a set of power supply systems, and uses the latest CPU powerful processing capability to complete various tasks. The unit price will be much lower than the total price of multiple products. The design can effectively control the cost of the bus company in the vehicle electronic terminal.
2, software and hardware integration design, convenient control management
(1) Use a unified wireless network link
In the traditional bus information system, multiple terminals on a bus have wireless data communication requirements, such as GPS terminals, 3G car video monitoring hosts, and POS card readers. The bus integrated machine replaces multiple sets of wireless networks with a single wireless communication link, which can greatly reduce the communication usage fee and equipment hardware cost, and also facilitates the maintenance and management of the terminal.
(2), ease of use
The bus integrated machine adopts an open operating system and provides a friendly interactive interface. The bus driver guides through the graphical interface and is easy to use. The bus integrated machine adopts a color liquid crystal display, which can directly obtain information related to vehicle operation, such as time, speed, line, site, weather, command and other information, as well as video screen and vehicle driving status. Fourth, the prospect of intelligent public transport and car video integrated machine technology
1. Application of intelligent technology on one machine
(1) Video passenger flow statistics technology
Bus companies have an urgent need for passenger flow statistics, especially want to know the passenger flow data of each line and site. The traditional bus passenger flow statistics adopt the pedal mode or the infrared radiation mode. The accuracy of these two acquisition modes is low, and the passengers can not make a correct judgment on boarding and disembarking. The accuracy of video traffic statistics is significantly higher than the traditional method, and it can be judged whether to get on or off according to the personnel movement mode. The relevant intelligent application can be realized on the public transport machine in the future.
(2), face recognition comparison technology
As a public place for public transportation, public transportation vehicles have a very large daily flow. If you can upload the daily passenger's face image to the monitoring center and compare it, you can find the wanted criminal or thief recidivist at the moment and commit civil affairs. Criminal cases can provide pictures of suspects.
(3), high-definition camera access technology
The bus integrated machine can realize high-definition digital camera access, and more clear materials can be collected through the high-definition camera. For example, the vehicles occupying the bus lane can be photographed and compared, and the illegal vehicle license plate can be reported.
2. Application of vehicle networking technology on one machine
The vehicle networking system refers to the use of advanced sensing technology, network technology, computing technology, control technology, and intelligent technology to comprehensively perceive vehicle conditions and road traffic, and realize the interaction of large-scale and large-capacity data among multiple systems. And network monitoring and management to improve traffic efficiency and traffic safety based networks and applications.
As one of the core equipments for intercommunication between vehicles and central platforms, the public transport integrated machine will realize the application of vehicle networking related technologies in the future, such as reporting road congestion information, passenger detention information, and obtaining vehicle guidance information. Through the vehicle networking related technology, the real-time intelligent bus dispatch management of the vehicle can be performed through the road condition information. And with the promotion of 4G technology, passengers can use the WIFI network and 4G network of the all-in-one to access the Internet while riding. Provide remote platform behavior specification monitoring, real-time query of remote vehicle status, and remote platform fault alarm and diagnosis and other central platform functions.
V. Summary
At present, all the mainstream car DVR manufacturers have launched the first generation of intelligent bus and car video integrated machine products, and the bus company has recognized the related products. With the gradual implementation of the “12th Five-Year Plan for Urban Public Transport Developmentâ€, the government has increased investment in public transport informatization construction. The trend of replacing the traditional vehicle-mounted electronic products with the public transport integrated machine is very obvious. I believe that the bus will be used after a few years. An all-in-one change will occur in the terminal.
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