AN INTERNAL COMBUSTION ENGINE SYSTEM

The disclosure relates to an internal combustion engine, ICE, system (100) comprising: an internal combustion engine (10) for combustion of gaseous fuel and having a combustion chamber (7) at least partially delimited by a cylinder (2); a reciprocating piston (3) moveable within said cylinder between a bottom dead centre (BDC) and a top dead centre (TDC), said reciprocating piston having a piston top end (16) comprising a piston bowl (6) intended to form part of the combustion chamber, said piston bowl further comprising a plurality of spaced-apart protrusions (40) circumferentially distributed around a centre axis on a bottom section (11) of the piston bowl, each one of the spaced-apart protrusions extending a substantial part in a radial direction towards the centre axis; a controllable fuel injector (13) arranged to inject gaseous fuel with a low injection pressure into the combustion chamber and toward the piston bowl; and a controller (90) configured to control the controllable fuel injector to inject at least one gaseous fuel jet towards the bottom section of the piston bowl during a fuel injection period occurring prior to an ignition event of the gaseous fuel.