carbon monoxide emissions a desirable manner by means of the control device 12 for example the shut off element 15 can be controlled such that the exhaust gas recirculation rate is raised to over 30 in relation to the charge air quantity supplied to the internal combustion engine 1 the recirculated exhaust gas quantity can also be raised in that a choke device not shown here is provided in the inlet side charge air line 2 in order to increase the pressure difference between the exhaust gas and charge air 3 alternatively or additionally via the control line 16 the internal combustion engine 1 can be controlled such that the air fuel ratio lambda can be lowered for example to below 1 05 and or the injection pressure can be raised by for example at least 20 or to at least 1200 bar alternatively or additionally a shift in injection time for the internal combustion engine 1 can also be provided for example to at least 20 u00b0 crank angle but no more than 370 u00b0 crank angle before the top dead centre ignition tdc also alternatively or additionally a lowering of the compression ratio in particular by at least 20 and or a change in valve opening times can be provided such a change in operating parameters ensures that large quantities of reducing agent in particular carbon monoxide are generated in the exhaust gas flow of the internal combustion engine 1 and oxidised on the no oxidation.