本文選題：無線傳感網(wǎng)　切入點：ZigBee　出處：《安徽理工大學(xué)》2014年碩士論文

【摘要】：由于機動車數(shù)量迅速增加而導(dǎo)致了越來越嚴重的城市道路擁堵問題。城市交通燈控制系統(tǒng)是智能交通系統(tǒng)的重要組成部分,它對提高道路使用效率,節(jié)約能源有至關(guān)重要的作用。本文針對現(xiàn)在城市交通燈控制系統(tǒng)存在的布線麻煩、容易受環(huán)境因素影響、實時性差、維護不方便以及運行成本高等諸多缺陷,設(shè)計了一種無線傳感網(wǎng)和模糊控制算法相結(jié)合的城市交通燈控制系統(tǒng)。 本文給出了磁阻傳感器HMC5883L與微控制器CC2530相結(jié)合的采集節(jié)點的設(shè)計,介紹了基于ZigBee無線協(xié)議數(shù)據(jù)傳輸模塊和以STM32作為協(xié)調(diào)器主控芯片的硬件設(shè)計。文章設(shè)計了針對單交叉口四相位的交通燈的綠燈延時模糊控制器,控制器選擇當前相位車流量參數(shù)和下一相位交通流參數(shù)作為輸入,當前相位綠燈延長時間作為輸出,并給出了模糊規(guī)則的建立過程和控制流程的設(shè)計。該控制系統(tǒng)有以下優(yōu)點：1.用磁阻傳感器檢測相關(guān)交通參數(shù),該方法不會受到壞境因數(shù)影響具有很好的準確性和穩(wěn)定性；2.數(shù)據(jù)傳輸采用ZigBee無線協(xié)議不僅省去布線的麻煩還具有很好的實時性,并且易于后期擴展和維護；3.使用模糊算法設(shè)計綠燈延時控制器,使紅綠燈可以根據(jù)路口當前交通流實時改變通行時間。 最后以MATLAB作為仿真平臺對該控制系統(tǒng)的可行性和有效性進行了驗證。結(jié)果表明,該控制系統(tǒng)可以實現(xiàn)交通參數(shù)的實時采集和無線傳輸,交通信號燈的模糊控制可以在很大程度上縮短車輛等待時間,提高了交通效率。
[Abstract]:The rapid increase in the number of motor vehicles has led to more and more serious problems of urban road congestion. Urban traffic light control system is an important part of intelligent transportation system, which can improve the efficiency of road use. Energy conservation plays an important role. This paper aims at the defects of the current urban traffic light control system, such as wiring trouble, easy to be affected by environmental factors, poor real-time performance, inconvenient maintenance and high operating cost, etc. An urban traffic light control system based on wireless sensor network and fuzzy control algorithm is designed. In this paper, the design of the acquisition node based on the combination of magnetoresistive sensor (HMC5883L) and microcontroller (CC2530) is presented. This paper introduces the hardware design of data transmission module based on ZigBee wireless protocol and STM32 as the main control chip of the coordinator. In this paper, a fuzzy controller of green light delay for traffic lights with four phases at a single intersection is designed. The controller selects the current phase traffic flow parameter and the next phase traffic flow parameter as the input, the current phase green light extension time as the output, The process of establishing fuzzy rules and the design of control flow are also given. The control system has the following advantages: 1. Using magnetoresistive sensor to detect the relevant traffic parameters, The method has good accuracy and stability without being affected by the bad condition factor. (2) the ZigBee wireless protocol not only saves the trouble of routing, but also has good real-time performance. The fuzzy algorithm is used to design the green time delay controller so that the traffic light can change the traffic time according to the current traffic flow of the intersection in real time. Finally, the feasibility and effectiveness of the control system are verified by using MATLAB as the simulation platform. The results show that the control system can realize real-time traffic parameter acquisition and wireless transmission. Fuzzy control of traffic lights can greatly shorten vehicle waiting time and improve traffic efficiency.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U491.51;TN929.5;TP212.9

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