城市快速路入口匝道控制算法的改进

Improvement on On-ramp Control Algorithm of Urban Freeway

本文阐述了城市快速路入口匝道控制的机理和作用,对匝道控制方法进行简单分类,分别给出了各种控制方法的模型表达式,并比较分析了不同控制方法的优缺点和给出了各自的适用范围。针对目前城市快速路入口匝道控制中的不足,结合模糊理论控制和支持向量机算法,提出了一种新的城市快速路入口匝道控制策略的标定方法,并给出了基本算法流程,能够满足城市快速路中不断变化的交通状况对控制策略的动态需求。最后,结合广州市某主干道上的实际调查数据,利用本文的控制算法得出了相应的控制方案,并将其用于该主干道的匝道控制中,通过对调查数据的分析表明本文的控制方法能满足动态变化的交通状况,控制效果较好,对城市入口匝道控制的方法研究有一定的参考作用。

The principle of on-ramp control strategies of urban road is represented,and some major on- ramp control strategies are classified, and then, all kinds of control method models are given. Based on advantages and disadvantages of these strategies,the explicabilities are given respectively. By using the fuzzy control theory and the support vector machine algorithm,a new method of on-ramp control strate- gy of urban freeway is proposed for some problems of existing control methods. The new method can sat- isfy demand that control strategy should change with the real-time changes of traffic condition in urban expressway. Finally ,control strategies are obtained by using the control algorithm proposed in this study based on survey data of some major roads in Guangzhou. These new control strategies and previous con- trol strategies are applied to actual control respectively. The control results show that the new control strategy can satisfies dynamic changes of traffic condition by analyzing survey data and have a good effect on the on-ramp control. The new control algorithm proposed in this study could provide a valuable reference for the urban on-ramp control.