基于车车通信的快速路入口匝道车速控制研究

为研究车车通信技术条件下车辆通过合流影响区时的运行情况，缓解快速路交通压力，提出车车通信环境下入口匝道车辆速度控制模型。首先，分析合流影响区车辆汇合存在的问题；然后，结合合流影响区车辆行驶速度需求，确定入口匝道车辆在加速车道上可汇合位置；接着，根据入口匝道车辆和主路最外侧车道车辆分别到达合流影响区汇合点的时间，建立入口匝道车辆汇入的车速控制模型；最后，对传统环境下和车车通信环境下车辆驶过合流影响区进行仿真。结果表明，在给定的仿真时间段，车车通信环境下，主路和匝道交通量分别为1 000veh/h和400veh/h时，合流影响区的交通量提高了19.5%，入口匝道车辆的平均行驶时间节约了26.9%、平均行驶速度提高了19.7%；主路交通量为1 800veh/h、匝道交通量为800veh/h时，传统环境下合流区车辆出现排队现象，车车通信环境下无排队现象。

Vehicle Speed Control of Expressway Entrance Ramp Based on Vehicle-Vehicle Communication

In order to study the operation situation of vehicles passing through the merging influence area under the technology condition of vehicle-vehicle communication and alleviate the traffic pressure on expressway, a speed control model for entrance ramp vehicle under vehicle-vehicle communication environment was proposed. Firstly, the problems of vehicle convergence in merging area were analyzed. Secondly, combined with the vehicle travel speed demand in merging area, the merging position of the entrance ramp vehicle on the acceleration lane was determined. Then, according to the arrival time of vehicle on the entrance ramp and vehicle on the outermost lane of the main road respectively reaching the convergence point of the merging influence area, the speed control model for entrance ramp vehicle was established. Finally, the simulation was carried out in which vehicle passed through the merging influence area under traditional environment and vehicle-vehicle communication environment. The results showed that in the given simulation period, under vehicle-vehicle communication environment, when the traffic volumes of the main road and the ramp were 1 000veh/h and 400veh/h respectively, the traffic volume in the merging influence area increased by 19.5%, the average driving time of entrance ramp vehicle saved by 26.9%, and the average driving speed increased by 19.7%. When the traffic volumes of the main road and the ramp were 1 800veh/h and 800veh/h, the vehicles in the merging area appeared queuing under the traditional environment, while there was no queuing phenomenon under the vehicle-vehicle communication.