Internal combustion engine system

A method for controlling an internal combustion engine, ICE, system, said ICE system comprising an internal combustion engine for combustion of gaseous fuel and having a combustion chamber at least partially delimited by a cylinder, wherein the internal combustion engine is a hydrogen internal combustion engine, and the fuel is hydrogen;

• a reciprocating piston moveable within said cylinder between a bottom dead centre (BDC) and a top dead centre (TDC), said reciprocating piston having a piston top end comprising a piston bowl intended to form part of the combustion chamber;
• a controllable fuel injector arranged to inject gaseous fuel into the combustion chamber and towards the piston bowl;
• said internal combustion engine further comprising an ignition source having a spark plug for igniting the gaseous fuel;
• wherein said method comprises:
• controlling the controllable fuel injector to inject at least one gaseous fuel jet towards the piston bowl during a fuel injection period occurring prior to an ignition event of the gaseous fuel, including controlling the controllable fuel injector to inject the at least one gaseous fuel jet towards the bottom surface of the piston bowl during the fuel injection period when said reciprocating piston moves from BDC to TDC during a compression stroke, and controlling the fuel injector to inject the at least one gaseous fuel jet during the compression stroke when the reciprocating piston travels from BDC to a piston position corresponding to 90 crank angle degrees (CAD) before the TDC;
• blending the hydrogen with air in the combustion chamber resulting;
• and
• igniting compressed hydrogen and compressed air in the combustion chamber with the ignition source.