Method of tuning a controller and a controller using the method

Details Method of tuning a controller and a controller using the method Method of tuning a controller and a controller using the method

G - Physics

05

B

G05B 6/02 (2006.01) G05B 11/42 (2006.01) G05B 13/04 (2006.01) G05B 23/00 (2006.01)

Patent

CA 2370772

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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