DIRECT SYNTHESIS OF RELAY CONTROL SYSTEMS

Relay control systems are widely employed in industry because of their realization simplicity and of their high work efficiency. Nevertheless, there are numerous related theoretical and practical issues that need to be further investigated. In particular, while the stability and the limit cycle analyses can be considered sufficiently assessed, the synthesis problem of relay controllers has not been considered systematically. In this paper a method for the direct design of relay control systems is provided that makes use of graphs and tables. Such graphs and tables are obtained by an analytical/numerical technique optimised with respect to the number of parameters that characterise both the plant and the relay controller. The effectiveness of the method is illustrated by the solution of a practical engineering problem.