高速公路多匝道协调控制系统设计与仿真

采用大系统分解和协调的方法研究高速公路多匝道的协调控制问题．建立了反映高速公路交通动态变化的有限差分模型，结合交通系统的特点提出改进的多层控制方法．控制结构分三层：局部控制层决定匝道调节率；协调控制层为局部控制层确定期望密度；自适应层根据实时检测交通状况选择模型和调整模型参数．仿真结果表明，控制系统具有良好的动态性能，该方法能有效地消除交通拥挤和维持主线车流稳定，能提高主线的通行能力，实现车辆在高速公路上高效、安全地运行．

Design and Simulation of Coordinated Ramp Control System on Freeway

The decomposition and coordination methods applie d to large system design are used for coordinated ramp metering on freeways. The f inite-difference model to describe the evolution of the traffic flow on freeway s is built. In conjunction with the characteristics of traffic systems, a modifi ed multilayer control method is proposed. There are three control layers in this control architecture: the local control layer to adjust the ramp metering rate, the coordinated control layer to determine the desired traffic density for the local control layer and the self-adaptive layer to select the traffic model and tune its parameters based on the freeway traffic characteristics in real time. Simulation results show that the control system is of good dynamic performance. It can eliminate traffic jams, maintain traffic flow stability, improve passing capability, and make vehicles travel more efficiently and safely.