信号交叉口饱和流率动态提取方法

杨东援; 罗江邻; 刘翀; 段征宇

doi:10.19818/j.cnki.1671-1637.2013.01.015

信号交叉口饱和流率动态提取方法

doi: 10.19818/j.cnki.1671-1637.2013.01.015

同济大学道路与交通工程教育部重点实验室, 上海 201804

基金项目:

国家863计划项目 2011AA110305

详细信息

作者简介:
杨东援(1953-), 男, 江苏南京人, 同济大学教授, 工学博士, 从事交通运输规划研究

中图分类号: U491.51
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- 被引次数: 0
出版历程
- 收稿日期: 2012-08-19
- 刊出日期: 2013-02-25

Dynamic extraction method of saturation flow rate at signalized intersection

Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 201804, China

More Information

Author Bio:
YANG Dong-yuan(1953-), male, professor, PhD, +86-21-69583775, yangdyk@yahoo.com.cn

摘要

摘要: 提出了利用感应线圈检测器动态提取饱和流率的方法, 前后车辆离开线圈的时间差为车头时距, 计算第4辆至最后一辆处于饱和状态车辆的平均饱和车头时距, 运用指数平滑法处理历史饱和车头时距与当前周期饱和车头时距。确定了车型及饱和车头时距判断阈值, 当线圈占用时间大于小型车平均占用线圈时间2倍时, 判断为大型车, 小型车的饱和车头时距判断阈值为历史平均值加1 s, 大型车的饱和车头时距判断阈值为历史平均值加5 s。用VISSIM软件进行仿真, 验证提取方法的有效性。仿真结果表明: 动态提取方法能减少饱和车头时距突变的影响, 当前周期车头时距骤减31.3%, 饱和流率仅增加5.6%, 5个周期的饱和流率分别为1 782、1 682、1 600、1 690、1 773 veh·h^-1, 而HCM模型的计算结果为1 680 veh·h^-1。与传统方法相比, 该方法能满足动态提取的需求, 实施成本低。
- 信号交叉口 /
- 饱和流率 /
- 动态提取 /
- 饱和车头时距 /
- 阈值
Abstract: The dynamic extraction method of saturation flow rate by using induction coil detector was proposed. Taking the time difference of the front vehicle and the following vehicle when departing from an induction coil detector as headway, the average saturation headway from the fourth vehicle to the last vehicle in saturation state was calculated. The average saturation headways of history and current cycle were dealt with exponential smoothing method. Thresholds for judging vehicle type and saturation headway were determined. When the occupation time of a vehicle was more than twice of the average occupation time of small vehicle, the vehicle was judged as large vehicle. The threshold of saturation headway for small vehicle was historical average saturation headway adding 1 s, and that of large vehicle was historical average saturation headway adding 5 s. The validity of the proposed method was testified by using software VISSIM. Simulation result indicates that the dynamic extraction method can reduce the sudden change influence of saturation headway. When the saturation headway suddenly decreases by 31.3% in current cycle, the saturation flow rate only increases by 5.6%, and the saturation flow rates in 5 cycles are 1 782, 1 682, 1 600, 1 690, 1 773 veh·h^-1 respectively, nevertheless, the rate of HCM model is 1 680 veh·h^-1. Compared with the traditional methods, the method meets the demand of dynamic extraction, and the implementation of the method is low-cost.
- signalized intersection /
- saturation flow rate /
- dynamic extraction /
- saturated headway /
- threshold

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图 1 各周期饱和车头时距

Figure 1. Saturation headways of each cycle

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图 2 平均饱和车头时距

Figure 2. Average saturation headways

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图 3 第1周期仿真结果

Figure 3. Simulation result of the first cycle

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图 4 第2周期仿真结果

Figure 4. Simulation result of the second cycle

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图 5 第3周期仿真结果

Figure 5. Simulation result of the third cycle

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图 6 第4周期仿真结果

Figure 6. Simulation result of the fourth cycle

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图 7 第5周期仿真结果

Figure 7. Simulation result of the fifth cycle

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图 8 五个周期饱和车头时距和饱和流率变化

Figure 8. Saturation headways and saturation flow rates of five cycles

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参考文献(16)

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