M. Chidambaram, DESIGN OF PI-CONTROLLERS AND PID-CONTROLLERS FOR AN UNSTABLE FIRST - ORDER PLUS TIME-DELAY SYSTEM, Hungarian journal of industrial chemistry, 23(2), 1995, pp. 123-127
Explicit formula for design of PI and PID controllers are derived for
an unstable first-order plus time delay system. A condition for the ma
ximum value of (tau(d)/tau) for stability is derived. The performance
of the PID controller with the proposed controller settings is compare
d with that of:DE PAOR and O'MALLEY [1]. The present controller settin
gs give less overshoot and less settling time for both the servo and r
egulatory problems.