Marcelino Martínez Sober, J. V. Salcedo
The design of PID controllers using the root locus method, based on classic module and argument criteria, is currently taught in most basic academic control engineering courses, and is found in most texts on the subject. Traditionally, PID controllers are designed by applying geometrical rules to calculate PID parameters. Although this task can be computerized, it is not easy to achieve because of the special characteristics of the particular equation criteria, which are presented as a trigonometric equation that is generally solved using iterative methods. An alternative method with an equivalent result that is computationally efficient and does not require iterative calculations is implemented in Sysquake# and a new interactive CAD tool is provided: ProPID. Using this tool, students can easily become familiar with PID behaviour in a closed loop and compare the specifications obtained with those desired. This software tool also enables the student to redesign the PID to verify, as far as possible, the desired specifications. All of the design work is implemented within an interactive environment and any modification of the design parameters produces an immediate dynamic response. This key aspect enables students to learn interactively.
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