Diesel engines are indispensable power machinery in current industrial and economic development,and also a major contributor to NOX emissions.Assisting high-quality economic development,accelerating the formation of new productive forces in the internal combustion engine industry,making diesel engines more efficient and greener,improving SCR conversion efficiency,and reducing NOX emissions are key factors.The article uses a test bench and atmospheric simulation equipment to conduct experiments under atmospheric pressures of 80kPa,90kPa,and 100kPa,to study the emission characteristics of NO and NO2 at different altitudes,as well as the influence of the ratio of NO2 to NOX on SCR conversion efficiency.The research results indicate that as the rotational speed increases,the emissions of NO and NO2 both decreases,and the higher the altitude,the fewer the emissions of both.There is a trade-offbetween NO and NO2 emissions.As the ratio of NO2 to NOX increases,the SCR conversion efficiency gradually improves.However,when the ratio exceeds 50%,the SCR conversion efficiency will significantly decrease.
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