信号控制交叉口动态车道功能优化方法

为了应对交叉口交通供需关系发生显著变化的情况,合理分配交叉口空间资源,对信号交叉口动态车道功能优化方法进行研究.基于优化对象、优化参数和优化模型3个方面的分析,建立了以进口组为基础的动态车道功能优化模型.它可由整数非线性规划模型来描述,其优化目标为关键流量比之和最小.通过算例分析,对该方法的优化结果和计算速度进行了检验.研究表明,以进口组为优化对象可在保证优化结果准确性的基础上显著减少须同时进行优化的变量数,提高求解效率,以此为基础建立的优化模型可满足动态控制计算准确性和计算速度的要求.

Optimization Model of Dynamic Lane Assignment for Isolated Signalized Intersections

In order to deal with the significant variation of the relationship between the supply and demand of the signalized intersection, the method to allocate a dynamic lane use was discussed. Based on the analysis of the optimization objective, optimization variables and the optimization model, a dynamic lane assignment optimal method was proposed based on the approach group concept. The method was formulated as an integer non linear programming model. To minimize the sum of the critical flow ratio was the most important design objective. The accuracy and the computation time of the method were tested by numerical examples. Results show that the approach group concept can reduce the number of control variables significantly without reducing the accuracy of the optimization results and the proposed model can achieve the goal of real time dynamic lane assignment control.