基于绿灯需求度的单点公交信号优先控制策略

传统的公交优先控制策略无法有效地解决公交车辆的多向请求问题.提出了绿灯需求度的概念,设计了绿灯相位、红灯相位下绿灯需求度的计算方法,提出了一种基于绿灯需求度的相位切换决策流程.充分考虑公交车辆和社会车辆的到达、排队和等候情况,计算得到考虑公交优先的绿灯需求度,在此基础上进行相位切换决策可以实现基于绿灯需求度的公交信号优先控制.仿真测试和结果分析表明,该控制策略比常规公交优先控制策略更有效；相比跳相序方法,定相序的控制策略优先效果略差,但是对社会车辆的负面影响更小；当背景流量增加时,公交车辆延误增加很小,但社会车辆延误增加较多.

Isolated Transit Signal Priority Control Strategy Based on Demand Degree of Green

The traditional transit signal priority control strategy cannot effectively deal with multiple priority requests from different directions. The concept of demand degree of green(DDG) is proposed, and its calculation on green phase and red phase is designed. The decision making flow of phase change based on demand degree of green is proposed. By taking full account of the transit vehicles and general vehicles arrival, queue and waiting the DDG with the transit priority is calculated. Subsequently, transit signal priority control based on DDG is realized by the phase change decision making. Simulation test and analysis show that the proposed control strategy is more efficient than traditional transit priority control strategy. Compared with the skipped phase sequence, the priority effect of control strategy based on fixed phase sequence is slightly worse, however, the negative impact of general vehicles is less. When the traffic volume is increased, the increase of average delay of transit vehicles is small; however, the increase of average delay of general vehicles is quite large.