基于模型预测控制的环形交叉口信号配时方法

Signal timing method for roundabouts based on model predictive control

面向城市环形交叉口,尤其是多支路环交,以更好地适应道路交通流的时变特性为目的,采用模型预测控制思想,建立环道和入口处的动态过程预测模型.通过在线求解并滚动优化目标函数,得出一个滚动周期内环形交叉口轮放式控制的最佳信号配时参数.根据顺时针轮放相序和相位搭接规则,将动态配时方案作用于环形交叉口.仿真结果表明,利用提出的信号配时方法更加合理地分配了环形交叉口时空资源,对于多路畸形环交,有显著的避免环内"死锁"的效果,环形交叉口的整体运行性能显著提升.

The theory of model predictive control was used in order to better adapt to the time-varying characteristics of traffic flow regarding city roundabouts,especially multiple malformation roundabouts.A prediction model of the traffic behavior generated by a dynamic traffic model was constructed.The optimal signal timing parameters of roundabouts were got by optimizing the objective function online in the receding horizon.Then the roundabouts’signal timing scheme with clockwise release order and phase overlapping rules were given.The simulation results show that the proposed control method is more reasonable distribution of time and space resources in roundabouts.The method can effectively avoid the effect of 'dead lock' in multiple malformation roundabouts and improve overall performance.