車載虛擬交通號誌環境下 Green Wave 之研究;Study of Green Wave in Virtual-Traffic-Light Environment through VANETs

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Title:	車載虛擬交通號誌環境下 Green Wave 之研究;Study of Green Wave in Virtual-Traffic-Light Environment through VANETs
Authors:	沈宗億;Shen,Tsung-Yi
Contributors:	資訊工程學系在職專班
Keywords:	綠色智慧運輸系統;虛擬交通號誌;車載網路;速度建議;速度引導;Green ITS;Green Wave;Speed Advice;Speed Guidance;VANETs;Virtual Traffic Light
Date:	2013-01-30
Issue Date:	2013-03-25 16:16:54 (UTC+8)
Publisher:	國立中央大學
Abstract:	現今許多研究學者對於綠色智慧運輸系統 (Green Intelligent Transport Systems，Green ITS)的研究投入相當多的心力，希望藉由Green ITS推廣地球永續發展的理念，作為研究的重要指標。研究議題包括綠色智能交通、減少交通擁擠、降低污染、交通安全、輔助駕駛與節省建設維護費用等問題，提出了廣泛且深入的研究探討。有良好的交通控管十字路口的交通訊號能使車輛可以快速地通行，達到節約能源和提升能源利用，甚至減少溫室氣體的排放量，實現高效率且具有永續發展性的交通網絡。根據環境監測機構的調查，都市交通擁擠是造成汽油消耗和大量廢氣排放的重要“元凶?，而汽車在停等紅綠燈時加速和反覆剎車減速的過程，所消耗油量是正常行駛的數倍至十幾倍，有害氣體的排放量也相對倍增，因此積極採取有效措施，保持都市交通通暢，對於交通號誌控制“Green Wave”來說顯得更加重要。隨著科技發展、車輛能耗要求、道路使用需求日漸提高的趨勢下，全球在過去近三十年的時光裡，不遺餘力地發展智慧型運輸系統(Intelligent Transport System，ITS)與車載資通訊系統 (Telematics) 的各項先進技術及創新應用，產業結構也已十分完整，諸多技術與應用服務也已邁向綠能資通訊技術(Green Information and Communication Technology，Green ICT)等方向前進，進而內化為許多民眾日常的交通習慣，成為一種具備環保節能的下世代綠色生活價值。因此，本論文探討以車載無線網路技術建設的虛擬交通號誌，依據車輛數量及交通狀況需求，而動態調適性交通號誌的時間長度，在得知交通號誌的時間長度時，也能提供有經濟的行車速度以引導車輛快速經過更多十字路口，境而達到節約能源的效益。故Green wave速度引導(Green Wave Speed Guidance)，可以依車輛數或交通現況需求運行Green wave，在每個路口做調適控制交通號誌，讓路口可以達最大的車流量。以實際的台北地圖符合多路口的交通狀況下為模擬地圖，最後模擬結果顯示，在速度的引導車輛運行及相位組合時，所有的路口都可提升31%的車流量，所有車輛平均車速也提升40.1%，可節約能源18.1%。在Green wave支援運作下，車流量更提升至46%，所有車輛平均車速也提升至47.2%，可節約能源39.1%。Urban traffic congestion causes energy consumption and emissions. However, traditional traffic light is fixed time to change between green and red light. If traffic lights can dynamic change by traffic flow, drivers can go through a series of traffic lights with dynamic speed guidance over several intersections. Therefore, traffic management plays an important role in saving energy and improving vehicle speed. This study focuses on virtual traffic light and applies VANETs to support dynamic speed guidance to the drivers. Based on the speed information, we can achieve the goal of Green Wave so that energy consumption and emission reduction are minimized. Detailed are discussed the algorithm of green wave speed guidance and simulate in Taipei city. This study develops a green wave speed guidance strategy for virtual traffic light. As a traditional green wave speed guidance, any vehicle travels along with fixed speed. However, in the process of operation, the optimal speed advice to vehicle should take into consideration the current traffic conditions, road grade, etc. In this study, we presented an adjustable speed strategy based on a bi-directional intersection. According to traffic flow and the type of vehicles in the intersection decide dynamic speed guidance. Using VTL with V2V communication generates traffic signal “online” by vehicles. The dynamic speed control in virtual traffic light guides vehicle on the best running speed to go through serial intersections without stopping. Thus, green wave coordinated control reduces stop-and-go traffic and control signal to achieves real-time traffic smooth.As a case of study, the main road in Taipei is taken for simulation and evaluation in virtual traffic light. The simulation results compared with fixed signal show that, the performance of vehicle speed increased by about 47.2%. On the other hand, the improvement of throughput-to-volume increased by about 46%. As for the energy savings for vehicles with green wave speed guidance are found to be 39.1%.
Appears in Collections:	[Executive Master of Computer Science and Information Engineering] Electronic Thesis & Dissertation

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