筒内燃料直接噴射を用いた混合気制御によるガソリン圧縮着火機関の運転範囲拡大に関する研究(熱工学,内燃機関,動力など)

概要

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A narrow operational load range is one of the issues of HCCI combustion. The authors performed a study to expand HCCI operational range limited by knocking using direct fuel injection. There are two points to avoid knocking. One is to increase the working gas, the other is to retard ignition timing. When the fuel was injected at near compression TDC, the intake air temperature could be lowered due to the effect of promoted ignition by a stratified mixture and the working gas was increased. Also, ignition timing was retarded by adjusting injection timing. However, the single injection by direct injector caused excessive stratification and the upper limit was not expanded by the smoke limit. Therefore, port injection was used together, aiming at the homogenization of the air-fuel mixture. Due to this, smokeless combustion was achieved and the operational range was expanded from IMEP_g 450 to 600kPa. In addition, two-stage auto-ignition combustion was observed, avoiding a high pressure rise rate which is another issue of HCCI combustion.
2009-05-25