A signal coordination algorithm for two adjacent intersections based on approximate dynamic programming  

基于近似动态规划的相邻两交叉口信号协调控制算法(英文)

作　　者：别一鸣[1] 王琳虹[1] 王殿海[2] 马东方[1] 

机构地区：[1]吉林大学交通学院,长春130022 [2]浙江大学建筑工程学院,杭州310058

出　　处：《Journal of Southeast University(English Edition)》2012年第1期112-118,共7页东南大学学报（英文版）

基　　金：The National High Technology Research and Development Program of China (863 Program ) (No. 2011AA110304 );the National Natural Science Foundation of China (No. 50908100)

摘　　要：To reduce vehicle emissions in road networks, a new signal coordination algorithm based on approximate dynamic programming （ADP） is developed for two intersections. Taking the Jetta car as an experimental vehicle, field tests are conducted in Changchun Street of Changchun city and vehicle emission factors in complete stop and uniform speed states are collected. Queue lengths and signal light colors of approach lanes are selected as state variables, and green switch plans are selected as decision variables of the system. Then the calculation model of the optimization index during the planning horizon is developed based on the basis function method of the ADP. The temporal-difference algorithm is employed to update the weighting factor vector of the approximate function. Simulations are conducted in Matlab and the results show that the established algorithm outperforms the conventional coordination algorithm in reducing vehicle emissions by 8.2%. Sensitive analysis of the planning horizon length on the evaluation index is also conducted and the statistical results show that the optimal length of the planning horizon is directly proportional to the traffic load.为减少路网机动车尾气排放,建立了基于近似动态规划的相邻两交叉口信号协调控制算法.以捷达车作为试验车辆,在长春市长春大街进行实车实验,采集了完全停车以及匀速行驶2种状态下的机动车排放因子;以进口道排队长度、信号灯色作为系统状态的表达变量,以绿灯切换方案作为决策变量集,采用近似动态规划中的基函数方法,建立了规划时间窗内优化目标计算模型;并采用时域差分算法对基函数中的权重向量进行动态更新.在Matlab环境中验证了该算法的有效性,结果表明:所建立的算法较传统协调算法能够减少协调相位机动车排放8.2%.同时仿真验证了规划时间窗长度对协调算法控制效益的敏感性,发现最佳规划时间窗长度随着交通负荷的增加而增加.

关 键 词：signal coordination approximate dynamicprogramming vehicle emissions planning horizon 

分 类 号：U491[交通运输工程—交通运输规划与管理]