Method of controlling an internal combustion engine

The method for the governing of an internal combustion engine entails feeding to the engine at least temporarily a first fuel (A) and a second fuel (B), whereby the amount of first fuel fed to the engine per time unit is controlled or kept constant depending upon a control set point value, and the amount of second fuel fed to the engine per time unit is governed in dependence upon at least one determined engine parameter in order to achieve the predetermined nitrous oxide emission level. Independent claims are also included for the following: (A) a governor unit (6) to carry out the proposed method of engine governing; and (B) an internal combustion engine equipped with the aforesaid governor unit and with first and a second volume flow metering valve.