This research introduces two controllers for non-self-regulating systems with dominant time
delays. These controllers are designed using sliding mode control principles with built-in …

Properly designed controllers provide stable closed-loop response for open-loop unstable
processes. Internal model controller equivalent PID tuning rules for low order unstable plus …

A set of general expressions is derived from a single asymmetrical relay feedback test for
online plant identification. The expressions also remain valid for an odd symmetrical limit …

An enhanced PID control strategy is proposed for unstable processes. Ultimate data sets
and the process gain estimated from an improved relay feedback method are used to …

A PID controller is widely used to control industrial processes that are mostly open loop
stable or unstable. Selection of proper feedback structure and controller tuning helps to …

Proportional− integral− derivative (PID) control is widely used to control stable processes;
however, its application to integrating and unstable processes is less common. In the paper …

Page 1 Control of Unstable Systems R Padma Sree M Chidambaram a Alpha Science Page 2
Page 3 Page 4 Page 5 CONTROL OF UNSTABLE SYSTEMS Page 6 Page 7 CONTROL OF …

Methods to estimate process model parameters from both open loop and closed loop step
responses are proposed. The distinctive feature of the proposed methods is that the model …

A single-relay feedback test can be used to identify exact model parameters of an unstable
first-order plus delay (FOPDT) transfer function when a limit cycle exists. This is only true if …

An improved cascade control scheme is proposed based on modified Smith predictor for
controlling a class of unstable processes with time delay. The proposed control structure …