抄録
Gasoline homogeneous charge induced ignition by diesel (HCII) uses port fuel injection of gasoline to form a homogeneous charge and direct injection of diesel fuel to ignite. Gasoline/diesel hybrid fuel (GDHF) mixes diesel and gasoline by a certain proportion and then is directly injected into the cylinder for combustion. So far some exploratory studies show that these two ways may merge the advantages of gasoline and diesel fuel to achieve high efficiency and low emission combustion targets. Combustion characteristics, emission characteristics, thermal efficiency and adaptability of low-temperature combustion have been comparatively investigated on a modified high-pressure common rail single-cylinder diesel engine. The results show that Both HCII and GDHF modes can achieve higher thermal efficiency than gasoline SI (spark ignition) combustion and achieve equal or even higher thermal efficiency than diesel CI (compression ignition) combustion. As gasoline ratio increases, the ignition delay of HCII mode remains almost the same, while the ignition delay of GDHF mode increases; the combustion duration in HCII and GDHF modes shortens significantly. With the increase of gasoline ratio, soot emissions reduce significantly and have a biggest reduction of 90%. Soot reduction of HCII is more significant compare to GDHF. Combined with EGR (Exhaust Gas Recirculation), both HCII and GDHF combustion modes can achieve low temperature combustion, with very low NOx and soot emissions.
