Achieving Heavy-Duty Diesel NO_x/PM Levels Below the EPA 2002 Standards-An Integrated Solution

摘要

The diesel engine has long been the most energy effi- cient powerplant for transportation. moreover, diesels emit extremely low levels of hydrocarbon and carbon monoxide that do not require post-combustion treatment to comply with current and projected standards. It is admittedly, however, difficult for diesel engines to simulta- neously meet projected nitrogen oxides and particulate matter standards. Traditionally, measures aimed at reducing one of these two exhaust species have led to increasing the other. This physical characteristic, which is known as NO_x/PM tradeoff, remains the subject of an intense research effort.