Research On The Traffic Speed Guidance Strategy At Intersections Under The Environment Of The Internet Of Vehicles

When passing through the intersections in city,frequently accelerating and decelerating or even parking waiting will cause the vehicle speed fluctuating greatly,which will lead the increase of the fuel consumption and pollutant emissions and influence the travel experience of driver and passengers.Vehicle networkinging technology is used to guide the speed of vehicles passing through intersections,optimize the driving state of vehicles,shorten the driving time,so that effectively alleviating traffic pollution.This paper summarizes the latest research of speed guidance when vehicle passing through the intersections and analyses the intersection-speed guidance method under the environment of vehicle networking.Through the analysis of status of traffic signal and vehicle speed as well as other factors,a traffic strategy of vehicle passing through the intersections without stopping is put forward and the green wave band speed optimization is carried out for the passing-through strategy by introducing the time variable of trigonometric function.Under dynamic green bands generated by different strategies and different scenes,trigonometric function and time variable is added to optimize the vehicle discontinuously accelerating and decelerating in dynamic green wave band when satisfying the constraint of speed limit and comfort acceleration and deceleration.Based on the speed optimization of green wave band,an integrated speed guidance model for travel time and pollutant emissions optimization is established by introducing a specific power microscopic emission model.By analyzing the relationship between exhaust emissions and speed,Genetic Algorithms is used to solve the Velocity Optimization Model of Green Wave Band and an speed guidance curve of optimal vehicle travel time and emissions is acquired.The validity of the integrated-speed guidance model is verified by simulation.Compared with the condition without integrated-speed guidance,The simulation results show that NOx emissions have been effectively reduced by 23.21%,travel time reduced by 5.22%.The integrated-speed guidance model for intersections proposed in this paper can effectively improve the traffic efficiency and reducing the pollutant emissions,besides It can be also a useful reference for the future study of vehicle,speed-guidance optimization at intersection under the environment of vehicle networking.