A Study on Spray and Combustion Behavior in Heavy-Duty Diesel Engine Equipped with EGR 2001-01-3749

EGR, usually, is known as a technique that dramatically reduces NOx emission from diesel engine. Application of this technique, however, is difficult because it is likely to cause the deterioration in fuel consumption and the increase in PM emission. For the heavy-duty diesel engines, especially, trade-off between the PM and NOx formation becomes more severe, as well as may raise the problem in lubricant and durability. ^[1] Numerous researches, therefore, have been conducted to optimize EGR rate which minimizes emission level of NOx without increasing in PM and reduction of engine power. In this paper, as the research for the 11,000cc turbocharged diesel engine equipped with an EGR valve, one predicted the combustion and reduction characteristics of NO, O₂, and CO₂. Also, One tried to make a selection of optimized EGR rates based on this results. The emission levels of CO₂ were substantially increased according to the increase in EGR rate. The reduction rate of NO increased at the higher load, rather than lower load.