It contains of two loops. The inner loop contains the regular feedback mechanism whereas the outer loop contains an ideal reference model which the process needs to follow. The process and model outputs are compared and the error function is minimized through a suitable optimization routine in order to arrive at the re-tuned controller parameters.

V.7.2  Self Tuning Regulator

Self-Tuning Regulator on the other hand estimates the model parameters by measuring process inputs and outputs. The re-tuned model eventually guides the controller parameter adjustment mechanism. Figure V.17 shows the schematic of Self Tuning Regulator.

Fig. V.17 : Self Tuning Regulator