Method and device for tuning and control

A computer program product, comprising:

• a computer readable medium;
• and
• computer program instructions recorded on the computer readable medium and executable by a processor for carrying out a method for tuning a controller controlling a property of an industrial process having varying material flow rate, the method comprising:
• injecting excitation signals added to an output signal of the controller,
• receiving measurements of said property in response to said excitation signals,
• choosing a process model structure comprising at least one parameter with unknown value, this model structure describing an effect of varying material flow rate,
• estimating a value of said at least one parameter, based on said measurements of said property and an output signal from the controller, and
• calculating a model that describes dynamics from controller output to controller input based on the estimated value of said parameter, and on a basis thereof performing model based tuning of the controller.