车联网环境下基于可变相位的公交优先信号控制方法

Bus Priority Signal Control Method Based on Variable Phase in Internet Vehicles Environment

为适应交通量波动较大的交叉口运行特性,提出一种基于可变相位的公交优先信号控制方法,即交叉口信号的相序与相位组合可以实时动态调整。在车联网环境下信息双向和实时传输的基础上,根据公交车进入通信范围时的时间、速度以及交叉口排队状态的不同,建立了不同情况下公交车到达时间预测模型;然后根据公交车到达时间为不同候选方案分配绿灯时间,并以乘客通过率最大为目标,选取最优方案作为下一绿灯相位;最后利用VISSIM仿真平台的COM接口与Python编程软件搭建了车联网仿真平台,并以长春市光谷大街与飞跃路交叉口为例实现了该方法的应用。实验结果表明,在道路饱和度为0.8、0.9、1.0时,文中所提方法能有效减少交叉口人均延误;当道路饱和度为0.9、公交车比例为2%、4%、6%时,该方法可减少公交车延误达40%以上。因此,文中所提方法更适用于公交车比例较低的未饱和交叉口。

A bus priority signal control method based on variable phase was proposed to adapt to the operation characteristics of intersections with large traffic flow fluctuation.The method allows the phase sequence and phase combination of intersection signal to be dynamically adjusted in real time.Based on the bidirectional and real-time information transmission in Internet vehicles environment,a prediction model of bus arrival time in different situations was developed.The model considers the time and speed of the bus and the queuing status of the intersection when the bus enters the communication range.Then,the green time were determined for different candidate schemes according to bus arrival time.Aiming at the highest passenger pass rate,the optimal scheme was selected from candidate schemes as the next green phase.Finally,the COM interface of VISSIM and Python were used to achieve the proposed method in Internet vehicles environment.The intersection of Fei Yue Road and Guang Gu Street in Changchun was taken as an example.The test shows this method can effectively reduce the per person delay of intersections when the road saturation is 0.8,0.9 and 1.0.When the road saturation is 0.9 and the bus proportion is 2%,4%and 6%,the method can reduce the per person delay of buses by more than 40%.Therefore,this method is more suitable for unsaturated intersection with lower proportion of buses.