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为更好地根据交通流的变化状态实行相应的控制策略,提出一种针对不同交通状态采用不同控制目标函数的单交叉口信号配时优化方法。该法基于交叉口的占有率和流量比关系,把交通状态划分为空闲、畅顺、繁忙和拥堵4个状态。在不同状态下根据其不同的交通流特点,选用不同的控制策略和控制目标,设定不同目标函数进行配时优化。优化目标函数采用相对指标的3目标函数形式,把车辆平均延误、平均停车次数以及通行能力3个指标作为交叉口效益评价指标,可通过调整各个指标权重系数来满足不同交通状态下的配时需求。最后通过深圳市实际交叉口的例子进行计算和仿真。结果表明,该方法比经典配时方法在结合所提出的目标函数各指标上都优胜,目标函数更合理。
In order to better implement the corresponding control strategy according to the change of traffic flow, a single intersection signal timing optimization method with different control objective functions for different traffic states is proposed. The law based on the intersection of occupancy and traffic ratio, the traffic state is divided into four states of free, smooth, busy and congestion. According to the different characteristics of traffic flow under different conditions, different control strategies and control objectives are selected, and different objective functions are set to optimize the distribution time. The objective function of optimization adopts the form of 3-objective function of relative index. Taking the three indicators of vehicle average delay, average number of parking and traffic capacity as the evaluation index of intersection efficiency, the weighting coefficient of each index can be adjusted to meet the demand of different traffic conditions . Finally, through the example of Shenzhen actual intersection calculation and simulation. The results show that the proposed method is superior to the classic method in time distribution in all indexes of objective function proposed, and the objective function is more reasonable.