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The sampling period can be considered as an additional parameter in the design of a controller. In this paper we present an automatic adjustment procedure of the sampling period that tries to maintain constant the number of samples during the rise time If the sampling period is modified obviously the parameters of the discrete model will change. However from the knowledge of the initial sampling period,...
Fuzzy Control provides a good support to translate the knowledge of a skilled plant operator into rules, making intelligent control possible. But it is difficult to represent the expert's knowledge with no degradation, so a tuning phase is required. This is not an easy task, and there is not a general procedure for it. On the other hand, most of the control systems are still based on the...
This paper presents a new approach of centralized control for TITO processes which is based on the structure of inverted decoupling. After defining the general expressions of this methodology, it is indicated how to specify the desired open loop transfer function in order to achieve free offset error and the desired performance (gain margins or phase margins). Then, the case of processes with all...
This paper presents a coordination strategy of anti-windup mechanisms based on conditioning by ??input scaling??. It is specially designed to be used in distributed control systems with PID controllers. The study considers three cases of TITO control systems: decentralized control, centralized control with decoupler and centralized control with four PID. In them, the allowable region in the control...
This paper presents a new methodology to design multivariable PID controllers for two-input and two-output systems. The proposed control strategy, which is centralized, combines four PID controllers plus two possible delays and two P controllers. The proportional gains in the P controllers act as tuning parameters in order to modify the behavior of the loops almost independently. The design procedure...
This paper describes a tuning tool for PID controllers. What makes this tool different to others available in the market is: (a) its ability to model the most important load disturbances, (b) its wide range of tuning methods that cover two types of specifications (features of time responses and features of frequency responses), (c) its possibilities in order to import or export data and to determine...
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