E103 A Study of Combustion Characteristics in an HCCI Engine using Dual Fuels

Homogeneous Charge Compression Ignition (HCCI) combustion has attracted considerable interest in recent years as a new combustion concept for internal combustion engines. The HCCI combustion process has four issues to be resolved: ignition timing control, slower combustion (maximum heat release rate), difficulty expanding stable operation to the high load region and avoidance of knocking. In this study, an attempt was made to overcome these issues by using double componential fuels. Absorption spectroscopic measurement was made in the combustion chamber in order to investigate low-temperature reactions in detail. As the result, by using double componential fuels, the ignition timing can be controlled and the rise of combustion can be slower.