bill akira

Hello everyone, does anyone among us know of this kind of control loop, I read the report but it does not describe this loop in a global and simple way, if anyone knows this kind of control system, I would like to have his analysis. The link: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwixmfy1hPf9AhWfUqQEHQh4DU4QFnoECA4QAQ&url=https%3A%2F%2Fhal.archives-ouvertes.fr%2Fhal-02178709%2Fdocument&authuser=3&usg=AOvVaw14ynoAfwcjEq0w0PNT9JBv