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城市交通信号控制系统是典型的混杂控制系统。针对当前大中城市普遍存在的快速路出口匝道、辅路及下游交叉口的信号协调控制问题,研究了一种多信号自适应控制方法,以保证出口匝道排队长度较小且下游交叉口排队不溢流。首先,基于车道路段当量排队长度建立状态方程,分别选取出口匝道、辅路交叉口和下游交叉口排队长度为连续状态变量,信号灯切换信号为离散控制变量;其次,以有限排队长度为模型约束,建立了包含快速路出口匝道、辅路及下游交叉口排队长度和信号状态的混合逻辑动态MLD模型;然后,比较研究了快速路出口匝道有信号灯控、无信号灯控两种不同情况下的MPC模型预测控制方法。仿真结果表明,基于MLD-MPC的控制方法可解决快速路出口匝道与辅路及下游交叉口的多交叉口信号协调控制问题。
Urban traffic signal control system is a typical hybrid control system. Aiming at the problem of signal coordinated control of ramp, sub-road and downstream intersection of expressway, which are ubiquitous in large and medium-sized cities, a multi-signal adaptive control method is studied to ensure that the length of exit ramp is small and the downstream intersection is not floated flow. First, the state equation is established based on the equivalent queue length of lane segments, and the queue length of the exit ramp, the secondary intersection and the downstream intersection are selected as the continuous state variables and the signal switching signals are discrete control variables respectively. Secondly, with the limited queue length as the model constraint, A hybrid logic dynamic MLD model including the expressway exit ramp, the auxiliary route and the downstream intersection queuing length and signal state is proposed. Then, MPC model predictive control is compared under two different situations, ie, method. The simulation results show that the control method based on MLD-MPC can solve the multi-intersection signal coordination control problem at the exit of the expressway and the bypass and the downstream intersection.