Asymmetric relay autotuning – Practical features for industrial use

The relay autotuner provides a simple way of finding PID controller parameters. Even though relay autotuning is much investigated in the literature, the practical aspects are not that well-documented. In this paper an asymmetric relay autotuner with features such as a startup procedure and adaptive relay amplitudes is proposed. Parameter choices and handling of noise, disturbances, start in non-steady state and other possible error sources are discussed. The autotuner is implemented and tested on an industrial air handling unit to show its use in practice. The experiments show good results, and prove that the proposed simple autotuner is well-suited for industrial use. But the experiments also enlighten possible error sources and remaining problems.     

工业自整定PID调节器关键设计技术综述

对十年来国内外在工业过程控制中使用的自整定PID调节的设计方法与关键技术进行了全面综述和评价,这对我国进行同类高科技自动化仪表的开发研制及商品化有重要的指导意义.     

PID调节器模型参考自整定研究

基于非参数模型整定ＰＩＤ调节器参数,不需要建立对象的参数模型。采用参考模型优化调节器参数,给出了模型最优匹配时的ＰＩＤ调节器参数的计算公式,并分析了系统稳定所允许的模型误差大小。     

一种新型PID自整定方法

Astrom的继电器反馈法整定PID参数以其简单实用而获得了广泛应用,但是这种使用理想继电器的辨识方法存在着辨识误差大和需要预先知道被控对象稳态增益两个缺点.为此提出了一种设定值饱和继电器反馈法.这种方法使用饱和继电器代替理想继电器以获得更精确的描述函数表示,并且使用反馈来校正被控系统使其增益为1.使用这种方法可以较好地克服继电器反馈法的两个缺点,辨识结果更接近真实值.仿真结果表明这种方法是行之有效的.     

PID参数自整定方法概述

PID控制是最通用的控制方法，其简易性、鲁棒性、应用广泛以及近似最优的性能是PID控制流行于学术界和工业部门的几个原因。最近，PID控制器整定不佳的问题引人注目，也有人在努力系统地解决此问题。本文扼要概述了PID的理论，然后讨论了一些常用PID整定方法，并对新技术尝试着进行了探索。     

On-line relay identification, assessment and tuning of PID controller

In this paper, we present an approach using relay feedback for automatic identification of the PID configuration and parameters in existing and operational closed-loop systems. During the duration of the same experiment, the control performance may be evaluated, providing an assessment of whether the current control parameter set is adequate and if re-tuning is necessary. Systematic and on-line automatic PID tuning rules are further developed and provided for common configurations of PID control. Simulation examples and a real-time experiment are provided to illustrate the practical appeal of the proposed method.     

自整定PID控制系统的研制

介绍了一种自整定ＰＩＤ控制系统。它采用数字触发可控硅技术,可以自动算出ＰＩＤ控制器的参数。电路简单、可靠,可以得出较为准确的参数。实验结果证明,该系统能达到较好的控制效果。     

A SIMPLE METHOD FOR TUNING CASCADE CONTROL SYSTEMS

A simple method for tuning controllers in a cascade system is presented, In this method, all the relations that facilitate the tuning procedures are well prepared in terms of figures or simple equations. Using these figures and equations, the controller tuning for different configurations of cascade systems becomes easy and straightforward when process models are available. On the other hand, when process models are not available, a simple method that uses one single run of step input experiment to develop such models is proposed. Based on these developments in the controller tuning and process models, an autotuning system that uses relay feedback is presented. Unlike the existing autotuning systems, this proposed system conducts identification and controller tuning in a decoupled manner. As a result, no excessive trial- and-error efforts for modeling and tuning are required. Simulation results show the potential usage of such a method, It is interested to see that the resulting systems have almost compatible responses to those systems which have been designed optimally in one way or another as reported in the literature. It is not, however, the purpose of this article to emphasize on obtaining superior performance to all other existing methods, but to emphasize on its effectiveness and simplicity for application.     

方舱自整定PID温度控制系统的设计

一般的智能控制方法,由于参数收敛速度慢、算法复杂、调试频繁等原因,很难适应精密温度控制系统的控制要求.介绍了一种自整定PID控制系统,论述了该系统的硬件设计、控制算法及软件设计.实验结果证明,该系统可以自动算出PID控制器的准确参数,达到较好的控制效果.