高速公路模糊延迟反馈匝道混沌控制信号施加策略

Strategies of inputting on-ramp chaos control signal with fuzzy delay feedback for freeway

研究采用模糊延迟反馈法的高速公路匝道混沌控制信号施加策略问题。针对交通系统的不确定性和非线性,建立以高速公路匝道为研究对象的对称双车道元胞自动机模型,选择全线总时间为评价高速公路匝道混沌控制效果的性能指标。采用高速公路匝道模糊延迟反馈混沌控制方法,通过仿真试验就高速公路匝道混沌控制信号施加条件与时机、取消条件与时机,与传统匝道控制方法的物理效果进行比较分析。结果表明当交通需求与道路通行能力接近的情况下,依据是否混沌迅速加入和取消混沌控制信号,能实现交通流从无序状态到有序状态,从而达到抑制交通拥堵、减少车辆通行时间、提高道路通行能力的目的,效果优于传统高速公路匝道控制方法,证明了这个具有开关功能的高速公路匝道混沌控制原理的可行性和有效性。

The strategies of inputting on-ramp chaos control signal in freeway were studied using fuzzy delayed feedback control. Based on the uncertainty and nonlinearity of traffic system, a symmetric two-lane cellular automaton model for the ramp of freeway was established, with the total vehicle travel time selected as the performance index of evaluating on- ramp chaos control for freeway. Based on the simulation experiments of on-ramp fuzzy delayed feedback control in freeway system, the physical effects of on-ramp chaos control were discussed about the condition and time of inputting chaos control signal, the condition and time of canceling chaos control signal, and the comparison between the present chaos control method and the traditional control methods. The feasibility and effectiveness of the on-ramp chaos control principle with the open-close function for freeway system were validated, when the chaos control signal may be input rapidly in chaos state and the chaos control signal may be canceled appropriately if the system is not in chaos state. If the traffic demand is close to road traffic capacity, the ordered motion can be realized, the traffic jam can be suppressed, the total vehicle travel time can be decreased, and the traffic volume can be enhanced by using the intelligent chaos control method, indicating that it is superior to the conventional control methods.