Method for the model-based open loop and closed loop control of an internal combustion engine

A method for model-based control and regulation of an internal combustion engine with a Selective Catalytic Reduction (SCR) catalytic converter in which an operating point of the internal combustion engine is predefined by an engine control unit and an operating point of the SCR catalytic converter is predefined by an SCR control unit, the method comprising the steps of:

• requesting an overall system quality measure that is calculated by an overall system optimizer in accordance with fed back values of the engine control unit and fed back values of the SCR control unit;
• changing default values for the engine control unit;
• and
• changing default values for the SCR control unit, the overall system optimizer minimizing the overall system quality measure for a prediction horizon with regard to operating costs, and wherein on the basis of the minimized overall system quality measure the overall system optimizer sets the default values for the engine control unit and the default values for the SCR control unit as decisive values for setting the operating points of the internal combustion engine and the SCR catalytic converter, wherein the overall system quality measure is minimized in that a first overall system quality measure is calculated by the overall system optimizer at a first point in time, at a second point in time a second overall system quality measure is predicted for the prediction horizon and a deviation between the first overall system quality measure and the second overall system quality measure is determined, and the overall system optimizer sets the second overall system quality measure as the minimized overall system quality measure in which the deviation is less than a threshold value.