pressure measuring device is thus to be adopted that is also desirably arranged in the fuel air mixture feed conduit 12 as an alternative thereto however if the regulating system is to be based on the nitrogen oxide emission value from the internal combustion engine it is also possible to use a device 8 at the exhaust gas side for measuring the nitrogen oxide emission values that variant is shown in broken line in fig2 the operation of determining the parameters t 2 u2032 zzp h ub and or l min which are optionally to be taken into consideration in the family of curves is effected in accordance with the state of the art a suitable temperature probe for measuring t 2 u2032 desirably also being arranged in the fuel air mixture feed conduit 12 replacement of the parameter q zu by the amount of fuel supplied per unit of time which is only determined by means of a through flow measurement procedure unit m 3 s possibly converted to normal conditions is generally recommended only if the fuel is of uniform quality the quality of the fuel can be characterised for example by a calorific value measurement operation conducted on the fuel the first regulating system according to the invention as shown in fig2 is also supplemented by a regulating section for ignition timing adjustment in fig3 that regulating section can ensure that there is always a regulating reserve margin available for rapid reaction to changes in load at the internal combustion engine 5 for that purpose a signal u which is characteristic in respect of the regulating.