Font Size: a A A

Intelligent Control Method Of Traffic Signal For Emergency Vehicle Priority Passage

Posted on:2022-11-01Degree:MasterType:Thesis
Country:ChinaCandidate:L ZhongFull Text:PDF
GTID:2492306776992509Subject:Automation Technology
Abstract/Summary:PDF Full Text Request
Smart transportation is an important research area of smart cities,and the signal control method for emergency vehicles(EV)is a research hotspot of smart transportation,and its research results can promote shortening the rescue time of EVs,which is crucial to save lives and reduce property damage.Traditionally,most of the methods to achieve fast passage of EVs are to provide green light signals for EVs using sensors or manual control,so that EVs can cross the intersection smoothly without stopping.With the increase of car ownership,distributed traffic signal control methods have become an emerging technology for smart transportation.In this paper,we propose an intelligent traffic signal control method for EVs to pass through the traffic light intersection without stopping,and provide a ”green belt” for EVs to drive smoothly at high speed.In this paper,three main aspects are studied.Firstly,we construct the fastest path ”green belt” model.On this basis,we construct the corresponding distributed intelligent agent model and the intelligent traffic signal control system architecture for EV priority passage.We design the traffic signal intelligent control algorithm,so that the traffic signal transitions in the no-request stage,saturationreduction stage,signal-preemption stage and restoration stage.Next,the intelligent traffic signal configuration method is designed for EV priority.The first step reduces the road saturation on the path of EVs by adjusting the traffic signal green time,so that other vehicles in front of the EV have space to give way to the EV,thus enabling the EV to drive at high speed.The second step is to provide the green signal for EVs through a combination of non-intrusive preemption and intrusive preemption so that EVs can quickly pass through the traffic light intersection in the green light duration.The third step restores the traffic flow in all directions at the intersection through a linear planning method to reduce the disturbance caused by EVs’ priority traffic to the whole traffic.In the second and third steps,this paper considers the intersections passed by the EV in real-time and predicts the number of queued vehicles.Finally,we conduct a series of experiments on the feasibility and advancement of an intelligent control method of traffic signals for EV priority passage in the traffic simulator SUMO.The results show that,compared with the fixed-time control method(FTCM),Min’s flexible signal preemption method(FSPM),and Qin’s EV signal pre-emption method(EVSP),our method can optimize travel time by up to 62.85%,50.83%,and 11.62%,respectively.In addition,the experimental results show that this method does not cause a significant impact on the traffic network.
Keywords/Search Tags:Intelligent Transportation Systems, Traffic Signal Control, Emergency Vehicles, Signal Preemption, Signal Timing
PDF Full Text Request
Related items