This work studies the complex interactions resulting from the application and control of Exhaust Gas Recirculation (EGR) on a production heavy-duty diesel engine system, and its effectiveness in reducing NOx emissions. The coupling between EGR, the Variable Geometry Turbocharger (VGT) and the EGR cooler critically affects boost pressure, air/fuel ratio (A/F), combustion efficiency and pumping work. It is shown that EGR provides an effective means for reducing flame temperatures and NOx emissions, particularly under low A/F ratio conditions. However, engine thermal efficiency tends to decrease with EGR as a result of decreasing indicated work and increasing pumping work. Combustion deterioration is predominant at higher load, low speed and low boost conditions, due to a significant decrease of A/F ratio with increasing EGR. For conditions allowing the VGT to maintain high enough boost and hence A/F ratio, efficiency losses with increased EGR are largely attributed to increased pumping work. Finally, the total system heat rejection increases significantly due to EGR cooling
The Impact of Exhaust Gas Recirculation on Performance and Emissions of a Heavy-Duty Diesel Engine
Sae Technical Papers
SAE 2003 World Congress & Exhibition ; 2003
2003-03-03
Aufsatz (Konferenz)
Englisch
A Study of the Effects of Exhaust Gas Recirculation on Heavy-Duty Diesel Engine Emissions
SAE Technical Papers | 1998
|A study of the effects of exhaust gas recirculation on heavy-duty diesel engine emissions
Kraftfahrwesen | 1998
|Speciation of Heavy Duty Diesel Engine Exhaust Emissions
British Library Conference Proceedings | 1995
|A Study of the Effects of Exhaust Gas Recirculation on Heavy-Duty Diesel Engine Emissions
British Library Conference Proceedings | 1998
|