Journal ArticleDOI
A comparative performance study of PID auto-tuners
C.C. Hang,K.K. Sin +1 more
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TLDR
In this paper, the authors compared the performance of three commercial single-loop proportional integral-derivative (PID) controllers: the SattControl relay feedback autotuner, the Foxboro EXACT self-tuning controller, and a refined Ziegler-Nichols prototype PID controller.Abstract:
The benchmark testing of the autotuning performance characteristics of three controllers is reported. The controllers are two commercial single-loop proportional integral-derivative (PID) controllers, the SattControl relay feedback autotuner and the Foxboro EXACT self-tuning controller, and a refined Ziegler-Nichols prototype PID controller autotuned by means of the cross-correlation method. A novel microcontroller-based process simulator has been used to simulate several generic processes for the benchmark tests. Quantitative results based on the integral squared error of the transient responses are used to contrast the relative performance of the autotuning controllers in the presence of setpoint change, static load disturbance, and measurement noise. Another performance measure, namely the retuning time, is used to compare performance. >read more
Citations
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Journal ArticleDOI
PID control system analysis, design, and technology
Kiam Heong Ang,G. Chong,Yun Li +2 more
TL;DR: It is seen that many PID variants have been developed in order to improve transient performance, but standardising and modularising PID control are desired, although challenging, and the inclusion of system identification and "intelligent" techniques in software based PID systems helps automate the entire design and tuning process to a useful degree.
Journal ArticleDOI
Relay Feedback Auto-tuning of Process Controllers – A Tutorial Review
TL;DR: The PID relay auto-tuner of Astrom-Hagglund is one of the simplest and most robust autotuning techniques for process controllers and has been successfully applied to industry for more than 15 years.
Journal ArticleDOI
Tuning of PID Controllers based on Gain and Phase Margin Specifications
TL;DR: In this paper, an analytical method is proposed to tune the PIIPID controller to pass through two design points on the Nyquist curve as specified by the gain and phase margins.
Journal ArticleDOI
Patents, software, and hardware for PID control: an overview and analysis of the current art
Yun Li,Kiam Heong Ang,G. Chong +2 more
TL;DR: An overview and analysis of PID patents, commercial software packages, and hardware modules is provided and the differences between academic research and industrial practice are highlighted so as to motivate new research directions in PID technology.
Journal ArticleDOI
A New Pattern Recognition Adaptive Controller with Application to HVAC Systems
TL;DR: A novel method for automatically adjusting the gain and integral time of proportional-integral controllers based upon patterns that characterize the closed-loop response is described, which is easy to use and provides near-optimal performance for a range of systems and noise levels.
References
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Journal ArticleDOI
Paper: Automatic tuning of simple regulators with specifications on phase and amplitude margins
Karl Johan Åström,Tore Hägglund +1 more
TL;DR: A simple method for estimating the critical gain and the critical frequency is described, which may be used for automatic tuning of simple regulators as well as initialization of more complicated adaptive regulators.
Journal ArticleDOI
Refinements of the Ziegler-Nichols tuning formula
TL;DR: It is shown that, for excessive overshoot in the set-point response, set- point weighting can reduce the overshoot to specified values, and the original Ziegler-Nichols tuning formula can be retained, and it is also shown thatSet-point weighting is superior to the conventional solution of reducing large overshoot by gain detuning or set- Point filtering.
Journal ArticleDOI
Brief paper: Pattern recognition: An alternative to parameter identification in adaptive control
TL;DR: The paper summarizes work using pattern features as a basis for practice and theory on how to characterize transient response computing readapted parameters which cause the control behavior to approach a desired transient 'shape'.
Journal ArticleDOI
Practical Aspects of PID Auto-Tuners Based on Relay Feedback
TL;DR: A reliable self-biasing auto-tuner is thus resultant because the resultant asymmetry of the relay switching intervals can be used as an error indicator, or used to compute a self-corrective bias to restore accuracy of the estimates.
Journal ArticleDOI
The choice of controller zeros
TL;DR: In this paper, the Ziegler-Nichols tuning formula was used to explain the heuristics used in the proportional-integral-derivative controllers and in the positioning of controller zeros in pole-placement controllers and phase-lag compensators.