Abstract—Homogeneous charge compression ignition (HCCI) engine has ultra low oxides of nitrogen (NOx) and particulate matter (PM) emissions with significant improvement in brake thermal efficiency. There is many issues still need to be solved for the efficient operation of HCCI mode engine. The homogeneous air- fuel mixture preparation is the one of the primary issue to operate the HCCI mode engine. The HCCI engine uses lean homogeneous air-fuel mixture, the performance and emission characteristics of HCCI mode engine can be determined by percentage of air-fuel charge convert to homogeneous form before the start of combustion process. Therefore, percentage of homogeneous charge is only parameter to improve the performance and reduce the exhaust emissions from the HCCI engine. Many researchers have been trying to improve the HCCI engine operation with improve the percentage of homogeneous charge. This paper briefly discussed possibilities and methods of homogenous charge preparation in HCCI engine and discussed the merits and demerits of homogeneous charge preparation methods used by the researchers. And also reviews the impact of homogeneous air-fuel mixture on the HCCI engine performance and emission characteristics.

Index Terms—Homogeneous charge compression ignition engine, Homogeneous charge preparation methods, External mixture preparation, In cylinder mixture preparation

Cite: Gowthaman S and Sathiyagnanam A P, "Review on Methods of Homogeneous Charge Preparation for HCCI Mode Engine," International Journal of Mechanical Engineering and Robotics Research, Vol.4, No. 2, pp. 138-153, April 2015.