On-line adaptive switching control for open-loop stable and integrating processes

The advantage of switching control is that the set-point is reached in a minimum time without excessive overshoot. But, the sensitiveness to modeling error is a common difficulty. A 2-df control scheme consists of an external close-loop model and a conventional feedback loop can solve the servo-tracking and load-rejecting problems individually and simultaneously. In the loop model, the switching-on-position control is used to drive the system to its set-point in a minimum amount of time, while the conventional loop is used to deal with modeling error and some possible unknown disturbances. The switching-on-position control is constrained by system parameters, and, a lead/lag compensator is used to relax this constraint in case it is necessary. Simulation results show that this presented method is effective for both open-loop stable and integrating processes.