RESUMO

There had been determined the conditions under which the minimum order of a differential equation with the highest derivative of the order m on the right side, which is used as a model of a linear dynamical system with PID controllers and adjusting links, should be equal to m+3. There had been given an example of identification of such model by the previously developed by the authors' method for models containing no derivatives on the right side, after its adapting to new conditions.