Study on Exhaust Emission Test of Diesel Vehicles Based on PEMS

摘要

In order to study the macro-model of vehicle exhaust emissions in accordance with the national conditions of our country, this paper tests the gas emissions of three different types of diesel touring vehicles by using PEMS system, and analyzes the relationship between their emission characteristics, vehicle speed and acceleration.The results show that the emission factor has a strong positive correlation with vehicle speed and acceleration, so increasing the driving speed and reducing the acceleration frequency can effectively reduce the emission of pollutants. At the same time, the COPERT model is used to predict the emission factors. Compared with the measured values, the COPERT prediction values of each pollutant are on the low side, and the error range is 7% - 65%, which provides a theoretical basis for further exploring the applicability of COPERT model in China.