Design of Sampled Control Systems Considering Dead Times and Fluctuating Sampling Periods.

In order to design control systems equipped with digital components, i. e. , microcomputers, it is necessary to develop a suitable model of the control system if the methods of the linear control theory should be applied, as this theory does not cover the value- and time-discrete mode of operation of the control devices. Hence, a model of the digital processing is developed, characterized by one dominant sampling period, one mean reaction time, and a mean value transfer function. The dynamic behavior of the model is approximated by a linear transfer function which permits the analysis of the control system in the frequency domain. Examples of a drive control and a high-speed train control demonstrate the use of the described method.