Internal combustion engine with compressor function

Internal combustion engine with compressor function, comprising inlet and exhaust valves for each engine cylinder, a fuel injection system with a unit injector and an electrically operated spill valve for each engine cylinder, a plurality of exhaust valves at at least one cylinder, one of said exhaust valves being a disc valve with a valve disc and a spindle disposed in a bore and cooperating with spring means, which bias the disc valve towards a closed position, and a hydraulic plunger cylinder device, by means of which the disc valve can be opened, characterized in that the plunger (35) of the plunger cylinder device (35,36) is subjected to the pressure in a pump chamber (7;33) which communicates with the fuel injection system and which belongs to pump means (7,8;33,34) which are driven by a cam element (15) having a cam curve (c), which initiates a pump stroke in said pump means before cam means (15) driving pump means (7,8) in the unit injector (5) initiate a pump stroke, and that the valve means comprise a control valve (40) which, in its closed position, blocks the communication of the pump chamber of the first mentioned pump means with the fuel injection system (12), so that the fuel volume enclosed during the pump stroke produces a displacement of the plunger (35) of the plunger cylinder device with associated displacement of the disc valve (21) towards its open position.