CONTROL LIMITS CONSIDERATION IN DISCRETE CONTROL-SYSTEM DESIGN

Consideration of control limits in the design of discrete control syst em and their impact on system performance is discussed in this paper. The mechanism of how the control limits influence the closed loop syst em behaviour is investigated using an approach different from that com monly adopted in the literature. Theoretical analysis in this paper re veals the effect of control limits in the form of a short-term behavio ur of the controlled system. This phenomenon is investigated by introd ucing a concept of 'short-term behaviour index'. With the introduction of 'dynamic control limits', an effective discrete control system des ign method is proposed to handle this problem.