Empirical Study Of Emission Based On CAL3QHC And Analysis Of Emission Reduction Schemes In Urban Signalized Intersections

Urban signalized intersection,an important component of urban roads and traffic pollution,is a significant tool to analyze the environmental effect of vehicle emissions,make emission control strategies and reduce traffic pollutions.The International Vehicle Emission(IVE)model was used to localize the emission factors of pollutants,which was compared and verified by the PEMS experiment.A pollutant dispersion model,CAL3 QHC was developed and modified,combining the real driving cycle and emission factors.According to the domestic and overseas researches,two emission reduction schemes,the Green Light Optimal Speed Advisory(GLOSA)system and the no-obstacle traffic system were proposed.Taking the intersection of Wen’er West Road and Liangmu Road in Hangzhou,China as an example,based on the VISSIM software,the roadside CO dispersion and the performance of emission reduction schemes were simulated and analyzed.The experimental results showed that,the localized emission factors of motor vehicles had apparent positive correlation with PEMS experimental results and the related error of the modified CAL3 QHC model results compared with field data was less than 10.75%.Besides,based on the performance evaluation by the modified CAL3 QHC model,the GLOSA system and the no-obstacle traffic system were able to release the roadside CO concentration by 21.24% and 22.10%,respectively.Related research achievements are of great significance for the government to monitor roadside pollutant concentrations,formulate and evaluate emission reduction strategies in the intersections.