Technical Paper
Control of Diesel Engine Pollutants by Split Injection Method using Muitizone Model
2001-11-01
2001-28-0007
The reduction of NOx without the degradation of soot emission and/or fuel economy necessitates the grasp of the in-cylinder temperature behavior, since NOx is mainly generated within localized high temperature regions in the cylinder of diesel engines. Therefore, a split injection method to reduce NOx has been proposed. In this method, injection is divided into two steps, the main injection of larger quantity and the sub-injection of smaller quantity. The sub-injection is practiced late into the flame of the main injection fuel. The moment of flame tip approaches the nozzle hole, the sub-injection is practiced, and the sub-injection spray folded in the flame. This attempted to control the localized high temperature regions by promoting the mixing of in-cylinder gases owing to supplementary fuel injection energy. Thus split injection suppresses the formation of nitrogen oxide.