Abstract
The main concept is to design the novel autotuner in a way that it will introduce benefits that arise from the effect of the fusion of the quantitative and qualitative knowledge gained from identification experiments, long-time expertise, and theoretical findings. The novelty of this approach is in the manner in which the expert heuristic knowledge is used for the development of an easy-to-use and time-efficient tuning process. In the proposed approach, the positioner simply learns, mimics, and follows up the tuning process that is performed by an experienced human operator. The major strength of this approach is that all parameters of positioner PID controller can be estimated by only identifying one single parameter that is the effective time constant of the pneumatic actuator. The elaborated autotuning algorithm is experimentally examined with different commercially available pneumatic actuators and control valves. The obtained results demonstrate that the proposed autotuning approach exhibits good performance, usability, and robustness. This should be considered as particularly relevant in the processes of installing, commissioning, and servicing single-action final control elements.
Highlights
The primary goal of this study was to focus on the systematic presentation of an original, fast, practicable, and easy to implement autotuning approach for the PID controllers to be utilized in a specific class of single-action electro-pneumatic final control elements
Single-action electro-pneumatic final control elements are commonly used in automatic control systems in the power, chemical, petrochemical, pharmaceutical, and food industries
A typical electro-pneumatic final control element consists of three main components: a pneumatic actuator, positioner, and control valve
Summary
The primary goal of this study was to focus on the systematic presentation of an original, fast, practicable, and easy to implement autotuning approach for the PID controllers to be utilized in a specific class of single-action electro-pneumatic final control elements. Single-action electro-pneumatic final control elements are commonly used in automatic control systems in the power, chemical, petrochemical, pharmaceutical, and food industries. A typical electro-pneumatic final control element consists of three main components: a pneumatic actuator, positioner, and control valve. The stem of the actuator acts on the control valve plug and, throttles the flow of the medium passing through the control valve. The primary goal of the positioner is to control the travel of the stem of the actuator, x, to follow-up the output, CV, of the external controller, C1 (Figure 2). The internal controller, C2, and the external controller, C1, constitute a cascade control system, where C2 acts as the secondary controller
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