1. 毕业设计（论文）的内容和要求
Nowadays, nearly all the crossroads adopt the electric traffic lights control system. Some of them are based on SCM (Single-chip Microcomputer) or MCU (Micro Control Unit), others are based on PLC (Programmable Logic Controller). Considering that PLC possesses higher stability than SCM in various weather conditions, this project selects PLC as the controller of the traffic lights.In addition, some traditional electric traffic lights are controlled by static time. However, the traffic loads on different directions are usually not eternal. For example, the number of cars who want to go across the crossroad from the South to the North or from the North to the South is 1.5 times than that who wants to go across the crossroad from the East to the West or from the West to the East during 7:30AM to 9:00AM. But the above ratio may change to 0.7 during 10:00AM to 11:30. Taking the number of traffic in different directions into account and dynamically adjusting the transit time may reduce the invalid waiting time as much as possible.The subject needs the candidate finish the schematic design, hardware configuration, software programming, debugging and simulation based on SIEMENS S7-1200 PLC and Portal (or MCGS). In order to simulate the dynamic ratio of traffic loads in different directions, the ratio can be set to a variable changed from 0.7 to 1.3 according to the Sin function.At last, the candidate should finish a thesis and defend it. And in the last part of the thesis, the author should also describe the impacts that other non-technical factors on the system, and the significance of the work from the views such as economy and safety. The cases which are needed:Finish the schematic design, hardware configuration, software programming, debugging and simulation based on SIEMENS S7-1200 PLC and Portal (or MCGS).In addition, the subject needs the student finish the programming by three methods, and compare them with each other.
2. 参考文献
[1] Shinde, Swapnil Manohar. Adaptive traffic light control system[C]. Proceedings - 1st International Conference on Intelligent Systems and Information Management, ICISIM 2017, v-2017: 300-306.[2] Ojeda-Cepeda, Ren Alberto; Peniche-Ruiz, Larissa Jeanette; Castro-Ynurreta, Ivn Antonio; Pool-Couoh, Edwin MoisesTraffic Light Control Through Intelligent Agents, Sensors and Arduino[J]. Communications in Computer and Information Science, 2019, 1053: 258-267.[3] Huang, Y.-S.; Su, P.-J.. Modelling and analysis of traffic light control systems[J]. IET Control Theory and Applications, 2009, 3(3):340-350.[4] Wen, W. A dynamic and automatic traffic light control expert system for solving the road congestion problem[J]. Expert Systems with Applications, 2008, 34,(4):2370-2381.[5] Zhao, Xiao-Hua; Chen, Yang-Zhou; Cui, Ping-Yuan. Optimal traffic light control method for a single intersection based on hybrid systems[J]. Journal of Harbin Institute of Technology (New Series), 2003, 10( 4):453-456.[6] Fernandez, Paulo; Del Carpio, Christian; Rocca, Eder; Vinces, LeonardoAn Automatic Control System Using the S7-1200 Programmable Logic Controller for the Ethanol Rectification Process[C]. Proceedings of the 2018 IEEE 25th International Conference on Electronics, Electrical Engineering and Computing, INTERCON 2018.[7] Liu, Hongli. Design for traffic light control program based on increment and comparison instruction[J].Materials Science and Engineering, 2018, 392(6). [8] S7-1200 Programmable Logic Controller Programming Manual[M]. SIEMENS PLC related.
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