基于模糊控制的环形交叉口信号配时方案优化

Optimization of signal timing scheme for roundabout based on fuzzy control

为了缓解进口道流量差异导致的环形交叉口拥堵,提高环形交叉口的交通运行效率,运用模糊控制的方法,提出一种适合环形交叉口的模糊控制器,以当前相位和下一相位的车辆最大排队长度为输入变量,以当前相位的绿灯延长时间为输出变量,通过优化信号配时方案来减小环岛车辆的平均延误,并借助MATLAB的模糊逻辑工具箱对模型进行了构建。为验证模型的有效性,以长春市的景阳广场为例进行实例仿真,采用VISSIM软件搭建环岛模型,在保证外部条件不变的情况下分别对优化前后进行仿真。结果显示,环岛车辆的平均排队长度降低了5%,车辆平均延误降低了6%,研究成果为环形交叉口信号配时提供了新思路。

In order to alleviate traffic congestion at roundabouts caused by traffic flow differences on the entrance road and improve the traffic operation efficiency of roundabouts,this paper proposes a fuzzy controller suitable for roundabouts using fuzzy control method.The maximum queue length of vehicles in the current phase and the next phase is used as the input variable,and the green light extension time in the current phase is used as the output variable.By changing the signal timing scheme,the average delay of roundabout vehicles is reduced,and the model was constructed using the fuzzy logic toolbox of MATLAB.To verify the effectiveness of the model,an example simulation was conducted using Jingyang Square in Changchun city.VISSIM software was used to build a roundabout model,and simulations were conducted before and after optimization while ensuring that external conditions remained unchanged.The results show that the average queue length of vehicles around the island has been reduced by 5%,and the average vehicle delay has been reduced by 6%.The research results provide new ideas for signal timing at roundabouts.