基于完全竞争机制的交叉口模糊控制模型

A Complete Competition Based Fuzzy Control Model for Isolated Intersection

通过两个新的度量指标——实际通行需求度(ATUD)和加权通行需求度(W TUD),反映各入口车道的交通需求,并提出一种基于完全竞争机制的交叉口模糊控制模型,旨在通过匹配各入口车道的交通供需,达到提高交叉口通行能力的目的。模型的控制过程如下:绿灯时间结束时,算出各车道的ATUD和W TUD,将通行权分配给W TUD最大的车道所在的相位。如果通行相位被选中,则绿灯时间延长一个事先设定值;当绿灯时间到达上限时,则根据W TUD选择下一个通行相位。如果非通行相位被选中,则将通行权交给该相位,并根据其中ATUD最大的车道设定初始绿灯时间。仿真结果表明,该模型比传统定时和感应式控制的适用范围更大,自适应能力也更强。

Based on two new measurement indexes actual traffic urgency degree（ATUD） and weighted traffic urgency degree（WTUD）, which introduced to reflect the traffic demand of each entry lane, a complete competition-based fuzzy control model for isolated signalized intersection is proposed for improving the capacity of intersection by matching traffic supply with traffic demand of every entry lane. The control process of the model is as followings. When current green time is over, ATUDs and WTUDs of all lanes are calculated out and right of way is assigned to the phase that at least one of its lanes possesses the largest WTUD. If green phase is selected again for passing, its green time will be extended for a predetermined time; if green time has go up to it upper limit, next green phase will be selected based on the WTUDs of all lanes. If red phase is selected for passing, then assign right of way to it and set an initial green time for it according to ATUDs of those lanes belong to this phase. The simulation result shows that compared with fixed-cycle and full-actuated control methods, it has a more extensive application range, and possesses the stronger self-adaptive competence.