The Research Of Vehicle Exhaust Emission Factor And Its Test Method

Vehicle exhaust emission has become one of the main sources of urban air pollution.The vehicle emission factors and actual traffic running status are the key influence factors of the total emission and pollution degree of vehicle exhaust.Therefore,this paper took the emission factor as the breakthrough point,and it was researched from the view of microcosmic and macroscopic based on the measurement done at the actual traffic running status.In order to obtain the actual working conditions of the emission data,we done a lot of motor vehicle exhaust emission test as portable emission measurement,tunnel survey and roadside measurement.This research could provide important scientific basis for analyzing vehicle pollution degree,establishing emission control strategy and developing low-carbon traffic.Firstly,by the analysis of the existing models and the relevant correction results of the study,it is concluded that existing ways to study vehicle exhaust emissions have shortcomings,then analyzed the inner factors of pollutants,finally it was concluded that the method should be combined with the measured data and researched from the angle of the micro and macro.Then pollutant emissions was tested in Hangzhou and relevant conclusion was obtained.Secondly,based on the test results,the prediction model was established.It was the model that made by the date of fuel consumption and the pollutant emissions that based on the real world driving cycle,and then combined the theoretical model of the fuel consumption.At last,the comprehensive prediction model was proved by using the real-time date.The experimental result shows that the effect of the model used the first time was accurate enough to predict the pollutant emissions such as CO and NO that the error between the actual and the predicted was 14.3% and 12.8%,and lays the good foundation for further experiment with the contact between the fuel consumption and the pollutant emissions.Finally,it was researched from the view of macroscopic.According to the principle of tunnel method,the experimental environment was generalized to the open air.From 6 to 8 am,the number of cars and the pollutants near the road was increased linearly.The background of the meteorological condition and pollutants was relatively stable.So the pollutants near the road was increased approximately comes down to the increase of vehicle emissions,and then the relationship was established,which can combine the Gauss diffusion equation back-stepping road traffic normal average vehicle emission factor.And then the resultswas multiple regressed and corresponding models of pollutant was obtained.Research results show that the method was a very good test on the promotion of the tunnel,the corresponding macro model also had a good simulation effect.