Method and apparatus for tuning a PID controller

Details Method and apparatus for tuning a PID controller Method and apparatus for tuning a PID controller

2006-04-25

2006-04-25

Knight, Anthony (Department: 2121)

Data processing: generic control systems or specific application

Generic control system, apparatus or process

Optimization or adaptive control

C700S029000, C700S031000, C700S041000, C700S042000, C700S043000, C700S037000, C700S050000, C706S903000, C706S906000

Reexamination Certificate

active

07035695

ABSTRACT:
In tuning a controller for a process in a feedback control system, a method is provided for bringing the system into asymmetric self-excited oscillations for measuring the frequency of the oscillations, average over the period value of the process output signal and average over the period control signal and tuning the controller in dependence of the measurements obtained. An element having a non-linear characteristic is introduced into the system in series with the process and set point signal is applied to excite asymmetric self-excited oscillations in the system. An algorithm and formulas are given for identification of the process model having the form of first order plus dead time transfer function. PI controller settings are given as a function of the dead time/time constant ratio. An apparatus for performing the method is disclosed.

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