Related papers
- One point relay identification experiment based on constant-phase filter
Using standard relay identification methods, one obtains a critical frequency response point with the phase shift 180 degrees. Such phase is not optimal for consequential PI(D) controller design especially when there is no additional knowledge about the process. This paper presents a new low-order filter providing arbitrary constant phase at about three decades. Such filter embedded into relay tuner shortens the experiment significantly and helps to identify the sample with arbitrary phase shift. The authors believe that presented approach may lead to improvement of existing relay autotuners. - Robust design of PID controller from process static gain and one point of frequency response
The first aim of this paper is to present an explicit parametrization of the value set boundary for a process-control-oriented model family consistent with the process gain and one point of the process frequency response obtained from a relay experiment. The second aim is to develop new PID design rules based on this parameterization. Moreover, the design procedure is converted to the suitable form for autotuning purposes. - Fractional-order PID controller design on Internet: www.PIDlab.com
The fractional-order PID controller (FPID) arises from the classical one after considering integrator and derivator of arbitrary real order. This paper describes the simple Internet tool for FPID design - the Java applet free accessible on www.PIDlab.com. - The fractional-order PID controller outperforms the classical one
The three-parameter PID controller is the most popular industrial controller thanks to its simplicity. Only two more parameters arise after considering the integrator and derivator of arbitrary real order. Such a generalized controller is called fractional-order PID controller (FPID). - Design of H-infinity PI controller by robustness regions method
This paper presents the complete analytical solution of the mixed sensitivity design problem for general SISO systems and the PI controller. - Iterative feedback tuning of PID controller
This paper is focused on iterative tuning of the 2DOF PID controller to minimize given quadratic cost function of the system output error and control effort. - Stability regions for PI/PID controller and Matlab program
The systematic procedure for construction of robustness regions in the parameter plane is given in the general case of stable and unstable as well as irrational systems with time delay. Design specifications are assumed in the form of simple constraints on the sensitivity and complementary sensitivity functions - Generalized robustness regions for PID controllers
In this paper, the systematic procedure for construction of robustness regions in the parameter plane of the PID controller is presented when we require that the open loop Nyquist plot does not have an intersection with a given general conic. - Exact revision of the Ziegler-Nichols frequency response method
The main subject of this paper is to provide an exact theoretically-based revision of the ZieglerNichols frequency-response method by solving the newly formulated robust design problem. It is shown that the original method can be considerably improved if a suitable point on the Nyquist curve is used instead of the ultimate point - Are heuristic methods for PID controller design reliable?
The main purpose of this paper is to define the set of admissible systems and test the existing methods on some extreme systems of this set. It is shown, that each method fails for some chosen admissible systems. - Robust PID controller design from constrained step response (CZ)
- Industrial PID controllers: tutorial (CZ)
- Robust PID autotuner: Method of moments (CZ)