Abstract:

          This paper presents a new adaptive PID controller with sensitivity specification. On the basis of process input and output data of normal operation in the control loop, important frequency responses of the process are estimated with signal decomposition and Laplace transform. A second-order and dead-time transform function is identified. PID control parameters are calculated to satisfy the sensitivity specification. The adaptive procedure of PID controller does not need any prior knowledge of the process and the previous controller to maintain normal operation of the loop. Simulation results are given to show effectiveness and feasibility of the propose adaptive PID controller.

Key words: adaptive control , frequency response , sensitivity , PID controller