A practical solution for the control of time-delayed and delay-free systems with saturating actuators

Tuning rules for unstable dead-time processes

“…One of the controllers in the literature that satisfy these requirements is the simplified DTC (SDTC), also known as simplified FSP (SFSP) [33] . Its adoption in this work is justified by: (i) it presents fewer tuning parameters than the FSP [31] , (ii) it can be directly extended to state-space models and the implementation of the predictor does not need an explicit pole-zero cancellation when dealing with integrating or unstable processes [32] and, (iii) even though processes with saturation are not the focus of this work, it presents good performance for the case of saturating actuators just by adding the saturation model at the input of the process model, as widely studied in [8,9,11,12,15,40] . However, this characteristic does no hold for a simplified control structure in a 2-DOF scheme.…”

Analysis and experimental application of a dead‐time compensator for input saturated processes with output time‐varying delays

“…However, time-varying delays are not considered and a formal stability analysis with the characterisation of a set of initial conditions and/or disturbances for which the internal stability of the closed loop is preserved is not presented by the authors. In [29], a practical solution for the control of systems with constant delay and input saturation is presented based on the design of a DTC for the linear system plus the addition of anti-windup to deal with saturation aspects. Nevertheless, a procedure for estimating the region of attraction in the case of uncertain (or time-varying) delays is not presented either.…”