14 and a high pressure injection valve injector 52 is located on one side with the injector injecting fuel directly into a combustion chamber 54 of cylinder 12 the injector 52 receives fuel through a fuel line 56 the fuel is supplied from a fuel tank not shown by a fuel pump also not shown with an admission pressure of for example 4 bar and is compressed by the high pressure fuel pump 22 to a fuel pressure which is between 40 bar idle mode and 120 bar for typical vehicle operating conditions the fuel pressure is set according to an operating point of the internal combustion engine 10 the fuel pump 22 in cooperation with a pressure control valve not shown compensates pressure variations in the accumulator volume 20 located upstream of the injector 52 the fuel pressure p r in the accumulator volume 20 is measured with a pressure sensor 58 which can advantageously be arranged in the common distribution rail the fuel pressure p r is controlled by the engine controller 40 see below via a closed control loop for sake of clarity fig2 does not show intake and exhaust valves which can be controlled electronically or via camshafts and which are arranged for movement in the terminations of the intake line 14 and the exhaust line 30 respectively of cylinders 12 fig1 and 2 also show an engine controller 40 which receives and processes various signals from the internal combustion engine 10 rotation speed rpm n engine and coolant temperature etc the exhaust system 28 lambda u03bb exhaust gas temperature the injection system 18 fuel pressure pr and the load request of the vehicle as indicated by a pedal value transducer signal pwg and other.