Abstract
This paper proposes a new auto tuning method for digital process control system under closed loop operation. The auto-tuning method is composed by combining an online parameter estimation method under the closed loop identifiability conditions, a newly developed conversion method from the identified pulse transfer function into continuous time transfer function and a digital control system design method based on partial model matching principle.
Based on the auto-tuning method mentioned above, a practical auto-tuning algorithm for digital PID process control system with reference input filter is shown. Moreover, the practical transfer function conversion algorithm newly developed is described in detail.
Response curves, which are demonstrated in experimental study, show the effectiveness of the proposed auto-tuning method.
