Vasile Cirtoaje, Alina Baiesu [631223]

Cover letter
Vasile Cirtoaje, Alina Baiesu
Department of Automatic Control and Computers University of Ploiesti, 100680, Ploiesti, ROMANIA Sept 28, 2017
Dear Editor-in-Chief,
We wish to submit the original research article entitled ON A MODEL BASED PRACTICAL
CONTROL ALGORITHM for consideration by Studies in Informatics and Control journal.
Abstract. The design of the proposed algorithm relies on three basic ideas: (1) finding a model based
controller such that for any stable process of propor tional type, the closed-loop controller output to a step
reference removes the steady-state error and has a step shape (or close to it); (2) refining the controller
structure such that the init ial value of the controller output to a step reference is
K times its final value,
where K is a tuning parameter with standard value 1; (3) extending the controller structure to address
integral processes and some unstable processes by turn ing them into stable compensated processes of
proportional type. The overall controller is a serie s connection P-IMC of two systems: one of pure
proportional type and another one of IMC type. There is a simple procedure to verify online if the model
parameters (steady-state gain, time delay and transien t time) have suitable values and to adjust them to
improve the model. As the PID control algorithm, th e proposed algorithm is quasi-universal and practical,
but it is superior by its control performance and the simplicity of the tuning procedure (which allows
persons with poor preparation to easily operate the cont rol system). Also, it is more practical than the
classical IMC algorithm because its equations have a unique form for processes of all types (as PID
algorithm), and has as tuning parameter a control ga in instead of a filter time constant. Several
applications are given to show the effectiven ess of the algorithm for processes of various types.
Keywords: practical and quasi-universal algorithm, model based algorithm, online tuning, transient time,
time delay, proportional process, integral pr ocess, unstable process, compensated process.

We confirm that this work is original and has not been published elsewhere, nor is it currently under
consideration for publication elsewhere.\
We have no conflicts of interest to disclose.
Authors grant an exclusive licence to the journal SIC.

Please address all correspondence concerning this manuscript at email address:
[anonimizat]
Thank you for your consideration of this manuscript. Signed: …………………………….. Name: Cirtoaje Vasile
Position: Prof. Date:

Signed: …………………………….. Name: Baiesu Alina Position: PhD Date: