Aiming at the difficulty of the vehicle congestion control in ad hoc network, this paper adopts the cooperative congestion detection and the path selection method combing distance with congestion to propose the Si-CoTEC (Simplified Coperative Traffic congestion detECtion),it is based on Vehicle-to-Vehicle communications. This mechanism not only considers the congestion degree detected by individual vehicle,but also considers all vehicles within the congestion queue when detects congestion. The mechanism can obtain the density and the length of entire congestion queue, simulation showed that the mechanism can effectively control the congestion of vehicles. In this paper, the detected density and length of congestion queue also being processed, a recommending value of changing road based on fuzzy mathematic theory is proposed. According to the value, simulation showed that vehicle can avoid making mistaken decisions of change road when there is no need to choose another way effectively, thereby reduce the probability of vehicle congestion.%针对车辆自组网中拥塞控制的难点,采用合作拥塞检测方法,并结合距离和拥塞等级的路径选择方法,提出一种基于车辆到车辆通信的简化合作拥塞检测机制.该机制不仅考虑个体车辆检测到的拥塞程度,而且考虑整个拥塞队列内所有车辆的实时状况,从而获得拥塞队列密度与长度信息,仿真表明使用该机制可对车辆拥塞进行有效地控制.其次,基于模糊数学理论,对检测到的密度值和队列长度进行了处理,提出采用换路概率推理值.利用该值,仿真表明车辆可有效避免错误的换道判断状况,从而降低车辆拥塞概率.
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