AN INTERNAL COMBUSTION ENGINE AND A METHOD FOR CONTROLLING SUCH AN INTERNAL COMBUSTION ENGINE

The invention relates to a method for operating an internal combustion engine (11) in a six-stroke mode; the engine comprising at least one cylinder (20) with a reciprocating piston (21), each cylinder having at least one inlet and outlet valve (22, 23), wherein the method involves performing a first stroke where a gas comprising at least air is induced into a combustion chamber (24) from an intake conduit (25); a second stroke where the gas and injected fuel is compressed; a third stroke where the compressed fuel/gas mixture is expanded following an ignition; a fourth stroke where combusted exhaust gas is expelled through a catalyst body (26) into a first exhaust conduit (27); a fifth stroke where pressurized fuel and pressurized heated water is injected into the combustion chamber (24) to be expanded; and a sixth stroke where steam and gaseous fuel mixture is expelled through the catalyst body (26) into a second exhaust conduit (28).