11.3. Autotuning Techniques
Many process control systems have an automatic tuning (autotune) feature. The operator can simply push the autotune button and have the controller tune itself, that is, determine the values of the tuning parameters. This is done not continuously (an approach known as adaptive control) but only when the operator feels that the current set of tuning parameters is not performing well.
The most common method of automatic tuning uses a relay switch to create what is essentially an on-off controller. The resulting oscillatory behavior is analyzed to determine the proper controller settings.
Control Block Diagram
The basic control loop for a controller with an autotune relay switch is shown in Figure 11-11. For normal operation, ...
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