BDC Bottom dead center.
BTDC Before top dead center.
CA Crank angle.
CFD Computational fluid dynamics.
CO Carbon monoxide.
CO2 Carbon dioxide.
DI Direct injection.
EGR Exhaust gas recirculation.
Fuel/air equivalence ratio.
HC Hydrocarbons.
H2ICE Hydrogen-fueled internal combustion engine.
ICE Internal combustion engine.
IMEP Indicated mean effective pressure.
IVC Intake valve closure.
NOX Oxides of nitrogen.
PFI Port fuel injection.
PM Particulate matter.
RPM Revolutions per minute.
TDC Top dead center.
TWC Three-way catalyst.