Study On The Vehicle Emissions Under Dynamic Condition And Effects Of Environmental Factors

Particular request of transportation operating ventilation of long tunnels and particularly extra long tunnels is desired in highway construction, for it deals with directly engineering architecture, investment scale of facilities and the safety and efficiency after the completion of runnel construction .The pollution emission amount from the automobile is one of the most key parameters, as it is the ground for selecting schemas of ventilation and is the base for designing the tunnel ventilation. Next to it, the problem of environmental air pollution due to automobile emission plays an important role in the evaluation of engineering project, decision, and relative policies or laws establishment. This paper is the first?going to question and investigate deeply the module measured value of pollution emission from automobile in dynamic environment, and affect that the environmental elements have on the module value .The paper applies the combustion theory of engine to form a calculation model of pollution emission of diesel and automobile, and to test by experiment that the feasibility and accuracy of model can satisfy the demand of engineering.Through the indoor platform experiment, road experiment and environmental pollution of analogue tunnel experiment, the paper investigates the smog emission amount of diesel and CO emission of automobile in different velocities.Through the practical test and analysis of pollution emission of automobile in different altitudes, the paper forms a mathematical model for the change of smog emission of diesel and CO of automobile from that of different altitudes.On the base of indoor platform experiment in analogue tunnel pollution environment, and of testing the automobile coursing in practical road and practical tunnel environment, the paper decides the effect that road lengthways lope has on diesel smog emission.The paper presents the suggesting values of diesel smog and CO emission module value of automobile.The research achievement can be referred to for the enactment of the planningstandards for highway tunnel environment and ventilation, highway tunnel length-way lope and for assessment of environmental effect of highway construction, and for the decision of important items of the nation and relative trades.This paper is completed on the support of the fund item of important transportation science and research in west nation: the research of highway tunnel ventilation technology of Zhong Nan Mountain of Qinling Ranges.