FAI缸内直喷二冲程汽油机低负荷燃烧特性的研究

初步试验研究了应用FAI喷射技术的缸内直喷二冲程汽油机低负荷工况下的燃烧特性。结果表明：FAI缸内直喷技术可以消除扫气短路造成的严重的HC排放和燃油浪费；对高残余废气率造成的低负荷燃烧不稳定现象，可通过采用进气旁通阀配合合适的喷油量和喷油相位控制来改善，此时发动机扭矩可通过喷油量和喷油相位控制而得到调节，但要将发动机扭矩控制到怠速工况，则需要更高的混合气浓度分层燃烧控制及燃烧系统的进一步改善。

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.