Study on the Environmental Factors Affecting the NOx Results of Heavy Duty Vehicle PEMS Test

The test technology of portable emissions measurement system (PEMS) has become an important means to carry out the test and research of the vehicle’s actual road emission. This paper takes the heavy vehicle with SCR post-processing technology as the research object. By comparing the emission of NOx pollutants at different altitudes, temperatures and loads, the factors that affect the NOx emissions of heavy vehicle PEMS test are studied.