Abstract
In order to reduce Particulate Matter (PM) emitted from Direct Injection Spark Ignition (DISI) engine, the key is to figure out the soot formation process in the cylinder in addition to the exhaust gas measurement. In this study, the distribution of soot diameter and soot number density in the cylinder was investigated by Time-Resolved Laser Induced Incandescence (TR-LII) technique with a glass cylinder engine. At fast idle, high density of soot was observed at the side of piston lip at the around bottom dead center of expansion stroke. And, on this timing, the soot shifted to large size.
