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.
　 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 for power supply, 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
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