Study of Light Load Combustion Characteristics of a Two-Stroke DISI Engine with FAI Injection System

This paper introduces the preliminary study of light load combustion characteristics of a two-stroke DISI engine applying free armature injection(FAI) technology.The experimental results show that FAI DISI technology could perfectly eliminate short-circuiting of scavenging mixture,which caused the high HC emission level and high fuel consumption rate for two-stroke engines,and the combustion instability in light load conditions,which came from high residual gas rate,could be improved by using a by-pass intake port with proper control of injection quantity and injection timing,which could be used to adjust the engine torque.But higher grade stratification combustion of in-cylinder mixture was needed in the idling condition,which meant that further improvement was needed for the present combustion system.