@inproceedings{79af5b8926e342758794618beacaeca7,
title = "Third quadrant nyquist point for the autotuning of PI controllers",
abstract = "The original relay autotuning method of Astrom and Hagglund [1] is based on the Nyquist point at the phase angle of -□ (the critical frequency). Recently Friman and Waller [8] have shown that the critical frequency is too high for PI controllers and proposed an autotuning method that finds a Nyquist point at the third quadrant through the two-channel relay and tunes PI/PID controllers. Here, we provide other reasons that Nyquist points at the third quadrant are better to tune PI controllers. In addition, methods to identify Nyquist points at the third quadrant which can be applied to noisy processes and to tune PI controllers are proposed.",
keywords = "Filters, Hysteresis, Nyquist points in the third quadrant, PI controller tuning",
author = "Jeonguk Byeon and Kim, \{Jin Su\} and Daewoong Chun and Sung, \{Su Whan\} and Jietae Lee",
year = "2009",
language = "English",
isbn = "9784907764333",
series = "ICCAS-SICE 2009 - ICROS-SICE International Joint Conference 2009, Proceedings",
pages = "3283--3286",
booktitle = "ICCAS-SICE 2009 - ICROS-SICE International Joint Conference 2009, Proceedings",
note = "ICROS-SICE International Joint Conference 2009, ICCAS-SICE 2009 ; Conference date: 18-08-2009 Through 21-08-2009",
}