Over the period of time, emission standards have become stricter and stricter. The adverse effect of greenhouse gases generated by not only industries but also automobiles have become a major concern for addressing as it produces ill health to all human beings. The tremendous growth in the automobiles and related industries have reached to an alarming level and necessitates engineers to work harder and harder to devise systems which can reduce harmful emissions to an acceptable level. Pre-Mixed Charge compression ignition (PCCI) is one of the technological methods of achieving complete combustion in an internal combustion engine which contribute further in reducing emissions. PCCI engine has been proved as a better choice in the present scenario where emission standards are degrading day by day making the environment dangerous for sustenance of life.

Keywords : Homogenous charge, Compression, Auto- ignition, Emissions, Lean mixture, Stoichiometric etc.