一种改进的多带宽干线协调控制模型

针对经典的多带宽干线协调控制模型——MULTIBAND中绿波带按照一条中心线严格对称造成的求解范围小和绿波带在绿灯时段内的位置不合理造成的绿波不稳定两个问题,从取消绿波带中心线对称和增加绿波带位置约束两方面入手,提出一种改进的MULTIBAND干线协调控制模型.改进后的模型提出了非对称式绿波的概念,允许不同路段上的绿波具有一定的灵活性,不拘泥于与其他路段绿波构成连续对称;同时增加了绿波带位置的约束,使得求解出的绿波带会尽量靠近上下游绿灯的中间位置,提高绿波运行的稳定性.以临沂市沂蒙路8个相邻交叉口的干线协调控制设计为例,用VISSIM仿真软件对改进后的模型进行了仿真测试和评价.结果表明,改进后的模型在绿波带宽与绿灯时间比值方面增加了7.1%,在延误和停车次数方面分别减少了20.8%和30.8%.

A Revised MULTIBAND Model for Arterial Road Coordinate Control

This study presents a modified MULTIBAND model to address the defects of the conventional MULTIBAND model, the restricted solution scope due to the constraint of symmetric green wave and the unstable green wave performance due to improper location of green wave within the whole green interval. The proposed model overcomes the constraint of the symmetric green wave to acquire a more flexible green wave and establishes another constraint on the green wave location to allow the green wave to be in the middle of the upstream/downstream green intervals as much as possible, the optimization model is modified accordingly. A simulation model based on the empirical data collected at 8 intersections along Yimeng road in the city of Linyi, China, is established to assess the performance of the proposed model. Results show that the proposed model is able to increase the total green wave band width by 7.1%, and reduce the average delay and number of stops by 20.8% and 30.8% respectively, as compared with the conventional MULTIBAND model.