Two-Level Control of Processes with Dead Time and Input Constraints

摘要

Using the idea of "shaping the control signal", this paper generalizes the time-delay-filter-based deadbeat control for processes with dead time to two-level control so that the actuator saturation is avoided. The controller mimics experienced manual operations to provide a two-level control signal. At the first stage (level), the controller outputs a value very close to the actuator saturation bound and then the controller outputs a smaller value to maintain the steady-state output the same as the set point. The system settles in finite time, which is explicitly determined by the saturation bound and is independent of the controller and (almost) of the sampling period. The disturbance response can be freely tuned according to the desired phase or gain margin. A simulation example is given to show the effectiveness of the proposed controller.