基于非线性优划的干道交通信号过渡模型研究

传统的干道协调系统中，干道信号控制方案间切换将会产生车流中断或扰动，无论是多时段控制、感应控制或自适应控制都存在这样的问题。针对传统过渡方法不是建立在优化过渡时期评价指标的基础上以及为了提高城市干道信号控制过渡时期车流的运行性能，建立了基于干道总延误最小的非线性约束过渡模型。通过同步式调整干道各交叉口的过渡周期长度与相位差来优化干道系统过渡时期性能，考虑车流离散因素对干道延误性能的影响，并通过改进的遗传算法求解。最后采用Visual C++调用仿真软件VISSIM内部COM接口进行案例分析。结果表明，与传统过渡方法两周期、三周期、减法（Subtract）、短路径（Shortway） 相比，所提出的过渡方法使道路延误性能平均提高了19.6%, 15.2%, 10.5%, 9.8%。该方法在大范围的交通和几何条件下的表现具有一定优势，在保证干道过渡延误性能的同时也给干道提供了最优的绿波带。

A Nonlinear Optimization Model for Arterial Traffic Signal Transition

In the traditional arterial coordination system, switching between arterial signal control schemes will result in traffic interruption or disturbance. Multi-period control, inductive control and adaptive control all have such problem. The traditional transition methods are not established based on optimizing the transition period evaluation indicator. In order to improve the performance of vehicle flow during the transition period under urban arterial signal control, a nonlinear constrained transition model based on the minimum arterial total delay was established. The transition period performance of the arterial system was optimized by the transition cycle length and phase difference of each intersection adjusted synchronously. The platoon dispersion was included in the nonlinear optimization which was solved by an improved genetic algorithm. Finally, Visual C++ was used to call VISSIM internal COM interface for case analysis. The results showed that the delay performance by the proposed transition method was improved by 19.6%, 15.2%, 10.5%, and 9.8% compared with the traditional transition method. This method has certain advantages in large-scale traffic and geometric conditions, and it can provide the optimal green wave band for the main road while ensuring the performance of the arterial transition delay.