Combustion control and operating range expansion in an homogeneous charge compression ignition engine with suppression of low-temperature oxidation by methanol: Influence of compression ratio and octane number of main fuel

Characteristics of combustion control with direct methanol injection in homogeneous charge compression ignition (HCCI) combustion were investigated over a wide operating range under several conditions including different compression ratios and three main fuels with different octane numbers. The operating range of HCCI combustion is limited by knocking at one extreme and misfire at the other. On th…