燃料の着火性と濃度不均一性が直接噴射式PCCI機関の燃焼特性・運転範囲に及ぼす影響(熱工学,内燃機関,動力など)  [in Japanese] Effect of Fuel Ignitability and Charge Stratification on Combustion and Operating Range with DI PCCI Operation(Thermal Engineering)  [in Japanese]

Premixed charge compression ignition (PCCI) might be one of the powerful tools to achieve high efficiency and reduction of particulate matter and NO^x emissions simultaneously. However, many researches have encountered serious problems of the difficulty of ignition control, high load operation and minimizing unburned emissions. To solve those issues, the author's intend to optimize this kind of combustion method from the standpoint of the modification of fuel, fn particular, the mixed fuel consisting of high volatility fuel is capable of use of early injection timing and has a possibility of controlling the fuel propagation process with early injection timing. Thus, this paper focuses on the effect of injection timing which controls the charge stratification on the combustion characteristics and operating range. A single-cylinder engine has been run with direct-injection PCCI operation. In addition, the effect of ignitability of fuel on them was investigated.