Impact of Engine Emissions From HCCI Engine: An Overview

Homogenous Charge Compression Engine (HCCI) runs in advanced mode of combustion were no spark plug or fuel injector is needed to initiate the combustion. When the chemical energy of the fuel attains its excited level (autoignition), air-fuel mixture gets auto-ignites in multiple spots of the combustion chamber. HCCI combustion process is faster than conventional Compression Ignition (C. I) and Spark Ignition (S. I) engines. Main advantage of using HCCI technology is to attain better thermal efficiency and maintains low emission by modifying S. I and C. I engines than conventional C. I and S. I engines. Objective of this review is to study the emission characteristics of HCCI at different test conditions and challenges faced to attain HCCI combustion.