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The problem of designing PID type-III control loops is investigated. On a theoretical basis and if frequency domain modeling of the control loop is followed, type-III control loops are characterized by the presence of three pure integrators in the open-loop transfer function. Therefore, such a control scheme has the advantage of tracking fast reference signals since it exhibits zero steady-state position,...
An analytical digital PID control law for the design of type-III control loops is developed. The proposed control law involves both dominant time constants of the controlled process, its unmodelled dynamics plus the sampling time of the controller. Basis of the proposed theory is the well known Symmetrical Optimum criterion. The development of the control law takes place in the frequency domain. For...
A systematic automatic tuning method for PID-type controllers in SISO systems is proposed. The method is inspired from the Magnitude Optimum design criterion and considers 1) the existence of a poor process model and 2) access to the output of the process and not to its states, as it frequently happens in many industry applications. For applying the method, an open-loop experiment of the process is...
The problem of on line tuning the PID controller used in type-I single input-single output control systems is investigated. This problem is met over many industry applications and involves two basic constraints 1) the existence of a poor process model and 2) inability to measure the states of the process. With respect to these constraints, a systematic method for automatic tuning of the PID controller...
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