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https://doi.org/10.4173/mic.2013.2.4
Copy DOIPublication Date: Jan 1, 2013 | |
Citations: 24 | License type: cc-by |
A modication of the PI setting of the Ziegler-Nichols closed loop tuning method is proposed. The modication is based on a combination of the Skogestad SIMC tuning formulas for \integrator plus time-delay processes with the Ziegler-Nichols tuning formulas assuming that the process is modeled as an \integrator plus time-delay process. The resulting PI settings provide improved stability margins compared with those obtained with the original Ziegler-Nichols PI settings. Compared with the well-known TyreusLuyben PI settings, the proposed PI settings give improved disturbance compensation. For processes with zero or a negligible time-delay, but with some lags in the form of time-constants, tuning based on ultimate gain and ultimate period may give poor results. Successful PI settings for such processes are proposed.
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