DESIGN OF PI-CONTROLLERS AND PID-CONTROLLERS FOR AN UNSTABLE FIRST - ORDER PLUS TIME-DELAY SYSTEM

Explicit formula for design of PI and PID controllers are derived for an unstable first-order plus time delay system. A condition for the maximum value of (tau(d)/tau) for stability is derived. The performance of the PID controller with the proposed controller settings is compared with that of:DE PAOR and O'MALLEY [1]. The present controller settings give less overshoot and less settling time for both the servo and regulatory problems.