Method and an apparatus in tuning a pid-regulator

Details Method and an apparatus in tuning a pid-regulator Method and an apparatus in tuning a pid-regulator

G - Physics

05

B

341/110

G05B 11/42 (2006.01)

Patent

CA 1201511

Abstract In tuning a regulator of the PID-type of a process in a feed back system where the process and the regulator has a transfer function G(s) in common, a method is provided for bringing the system into self oscillation for measuring the amplitude and fre- quency of the oscillation and tuning the regulator in dependence of the measurements obtained. A circuit function (NL) having non-linear characteristic and a describing function N(A) is intro- duced into the system in series to the process for acting on the regulator signal (e). Self oscillation is obtained if G(i .omega. )? N(A) = -1 for at least one value of the angular fre- quency .omega. and the amplitude A of the regulator signal (e). An apparatus for performing the method is disclosed.

409946

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