Study On Modeling And Simulation Of Additional Emission In Traffic Flow On Urban Arterial Road

With the increment of urbanization and the improvement of the retain number of automobile in China, the capacity of urban road resources cannot meet the demand of travel. As a result of the pressure for traffic, more and more negative problems are emerging rapidly. Many social problems such as constant traffic jam, vehicle emission increasing, the aggravation of air pollution have become an important and common topic of both government and general people which trouble them so badly. Therefore, we should take immediate action on creating environment-friendly transportation, saving energy, reducing emission and studying on the traffic flow emission model and its control method, which is very meaningful and has great practical significance at the same time.Combining theory model with computer simulation is one of the most efficient research methods in the field of intelligent traffic. All the work we do is based on car-following model, traffic flow model and traffic flow emission model which we have put much attention on. Then, it is turn to design the experiment via numerical simulation, obtain experimental data and continue further research.Firstly, we put up with the improved optimal velocity model after having a good knowledge of car-following model. The improvements include the improvement of optimal velocity function, parameters calibration of this model, application scope research. The improved model has shown better suitability in describing the actual traffic flow on the urban arterial road whether or not there is traffic light control.Secondly, based on the study of car-following model, we finally build the traffic flow model. According to the need of computer simulation, it is necessary to build signal control functions, driving model of both the lead car and follow cars in sections and intersections, motions pattern recognition rule and so on. Then, the actual traffic is simulated exactly.Thirdly, after having studied several traditional vehicle emission model and its applicable scope, we finally choose the vehicle specific power model because of its suitability and fashion. We redefine parameters, make connection between the vehicle specific power and emission rate and get the instantaneous emission rate through taking motion instantaneous motion information from vehicle, by which we build a solid foundation for the next further study about traffic flow emission.Fourthly, it is a creative action that we put forward the concept of additional emission and establish its calculation model. We focus on the analysis of traffic flow behavior in single intersection and coordinated control intersections, then separate additional emission from total emission through analyzing vehicle emission mechanism. It is a good attempt to make traffic control policy, which targets making the additional emission minimum by point control and line control.Finally, at present, though some popular microscopic traffic software like VISSIM and PARANICS are very powerful and functional, there is still some existed weakness, for example, it can’t meet many personal needs. So we design traffic emission simulation platform which mainly includes independent traffic flow module, traffic flow emission calculation and control module based on our own traffic flow simulation experimental system. It expounds emphatically the platform architecture, related control logical and simulation process.At the end of this paper, all of the research innovations and shortcomings are introduced, and the further research direction about these fields is prospected.In short, all of the research work is organized around the theme of reducing the traffic flow additional emission. However, in my opinion, the study is still in its infancy at present, much significant research should continue.