Predictor-based dynamic soft VSC in time-delay systems with magnitude-constrained input signal

In order to achieve a short regulation cycle time-optimal control has been considered in the past. However, implementation difficulties and sensitivity to errors and uncertainty have incited other research directions. In this paper, soft Variable Structure Control (VSC) is analyzed from the perspective of linear systems with input delay. Fast convergence under smoothly varying input signal is obtained. The stability issues originating from non-negligible time delay are addressed explicitly through the application of a state predictor, applicable to both structurally stable and unstable plants. Properties of the obtained dynamic soft VSC system are demonstrated analytically and verified in numerical experiments.