Patent ID: 7444190

Claim:
A modeling method for a control variable of a machine, by establishing a non-linear, stationary or dynamic model over an entire spectrum of all operating points of the machine, whereby the control variable is dependent on a set of system parameters, comprising the steps of: a) determining by way of measurement values of the control variable for a group of operating points out of the entire spectrum of operating points of the machine, b) determining an output quantity at the group of operating points using a partial model function modeling the machine behavior, c) adding at any operating point the output quantities of each partial model function in a weighted fashion to an associated weighting function to arrive at a total output quantity for the control variable of the engine for the respective operating point, d) determining for all operating points with the control variable determined by measurement a difference between total output quantity and value of the control value arrived at by measurement, e) choosing a further model function and using it with a further associated weighting function in such areas of operating points where an absolute value of this difference is above a preset value, such that an absolute value of the difference remains below the preset value, and f) repeating the steps of determining the difference between total output quantity of associated partial model functions and a value of the control variable of the engine at this operating point, that is evaluated by measurement, and of applying of a further model function and further weighting function as many times as needed until a statistically evaluated prediction quality of the model over the entire spectrum of all operating points of the machine has reached a desired value.