基于MFD的城市区域路网多子区协调控制策略

针对城市路网中区域性的大范围交通拥堵问题,提出了基于宏观基本图(Macroscopic Fundamental Diagram,MFD)的多子区协调控制策略,以提升路网的整体运行效益.该策略将城市区域路网划分为多个子区,每个子区的交通流又划分为内部流和转移流,综合两者建立了基于MFD的多子区交通流模型,并给出了对各子区交通流诱导时的边界约束条件;通过调节子区边界控制输入,设计了边界反馈控制器对各子区转移流进行动态诱导,继而进行了迭代分析,以判断其是否满足边界约束,并对控制器进行了Lyapunov稳定性分析.仿真结果表明,所提策略使城市区域路网中各子区车辆总数渐近收敛于设定值,且整体平均流量提高了约11%,大范围交通拥堵状况得到明显缓解.

Coordinated Control Strategy for Multi-subarea Based on MFD in Urban Zonal Road Networks

To deal with the regional traffic congestion over large areas in urban zonal road network, a coordinated control strategy for multi-subarea based on the MFD is proposed to improve the effectiveness of the whole road network. The proposed strategy divides the zonal road network into multiple subareas, and the traffic flow of each subarea contains the internal flow and the transfer flow. By combining the two types of traffic flow together, the multi- subarea model for the entire road network is built based on the MFD. Meanwhile, the bounded constraints of the accumulations of the subareas are given. Then，a boundary feedback controller, which is realized by regulating the inputs of the subareas’boundaries, is designed to induce the transfer flow of the subareas dynamically. Moreover, the iterative analysis is made to judge whether it meets the boundary constraints, and the Lyapunov stability of the controller is analyzed. The simulation show that the accumulations of the subareas asymptotically converge to the set point and the average flow increases about 11% than the previous, such that the urban regional traffic congestion is relieved significantly.