In order to obtain the relationship between motor vehicle CO emission factors and vehicle speeds in urban tunnels.This paper relies on Nanjing Shengli Road Tunnel, based on the COPERT Ⅳ model, combines the characteristics of Chinese vehicles and actual parameters in the tunnel to establish an urban single-vehicle tunnel model. A passenger car is used as a reference object to calculate the baseline emission value of its CO pollutant emission factor. A linear regression method is used to establish a model of the relationship between the CO pollutant emission factor and the speed of a single vehicle in an urban tunnel. The calculated results of the model are compared with the actual collected results. The results show that: 1. The CO emissions are highest when the passenger car speed is 10km/h; the CO emissions decrease sharply between the driving speeds of 10km/h and 50km/h; the CO emissions slowly decrease when the vehicle speed is greater than 50km/h And gradually stabilized. 2. The error between the CO emission parameters calculated using the model and the measured values is only 13.26%. It is suitable for calculation of CO pollutant emission factors that are popularized in other urban highway tunnels, and provides a theoretical basis for the research on the diffusion distribution and purification technology of urban tunnel pollutants.

CICTP