**Author details**

injection), but other methods (VCR, dual-fuel, etc) might not be as applicable in a production line engine. On the other hand, the possibility of using HCCI engine in combined heat and power engines for home use, where the operating conditions are less variable and no incom‐

plete combustion and/or knocking problems will be encountered, should be evaluated

**Abbreviations**

A/F Air to Fuel ratio

ARC Active Radical Combustion

140 Advances in Internal Combustion Engines and Fuel Technologies

BMEP Brake Mean Effective Pressure BSFC Brake Specific Fuel Consumption

BTDC Before Top Dead Centre CAI Controlled Auto Ignition CBCV Cycle-By-Cycle Variations CCD Charge-Coupled Device CFR Cooperative Fuel Research CI Compression Ignition

CO Carbon MonOxide CR Compression Ratio DI Direct Injection

HC Hydro Carbon

IC Internal Combustion

MON Motor Octane Number

NOx Nitrogen Oxides OI Octane Index

IMEP Indicated Mean Effective Pressure ISFC Indicated Specific Fuel Consumption

PCCI Premixed Charge Compression Ignition

EGR Exhaust Gas Recirculation GDI Gasoline Direct Injection

ATAC Active Thermo-Atmosphere Combustion

CIHC Compression-Ignited Homogeneous Charge

HCCI Homogeneous Charge Compression Ignition HCDC Homogeneous Charge Diesel Combustion

Alexandros G. Charalambides\*

Department of Environmental Science and Technology, Cyprus University of Technology, Lemesos, Cyprus
