高速公路主线可变限速模糊控制及仿真研究

Fuzzy Control for Variable Speed Limits and Simulation on Highway Mainstream

研究高速路交通流优化控制问题,在互通立交范围内,没有入口匝道放行限制的条件下,当交通需求达到一定程度时,造成交通拥挤甚至拥堵,交通流不稳定。为充分发挥通行效率,缓解交通拥挤,针对高速公路互通立交的特点,为主线限速控制,提出一种高速公路主线可变限速模糊控制方法。控制通过对入口匝道上游主线交通流的速度,实现交通流从拥挤状态调控到稳定状态。为评价控制方法的性能,用最短总行程时间为性能指标,与无控制情况进行比较。最后得出设计的可变限速模糊控制器,能够有效延缓互通立交范围内交通拥挤的出现,提高高速公路网的整体运行效率,保证车辆安全和高效的运行。

In the interchange area,without entrance ramp limit,the freeway traffic congestion will be caused when the traffic demand is too high.For the characteristics of interchange,a fuzzy control method for highway traffic is given to improve the efficiency of traffic and relieve the congestion.This control method can regulate traffic flow from the crowed state to steady state,by controlling variable speed limits for highway mainstream in the on-ramp upstream and combining characteristics of interchange.To evaluate the performance of this control method,a comparison is made with the case without control,and the minimum total time spent in the traffic network is used as the performance norm.This article concludes that this design of fuzzy controller for variable speed limits can effectively delay traffic congestion in the interchange area,further more,enhance the performance of the freeway traffic network,and ensure vehicles driven in the interchange area effective and safe.