Closed-loop Automatic Tuning of PID Controller for Nonlinear Systems  

Oleh:

Tan, K.K. ; Ferdous, R. ; Huang, S.

Jenis: Article from Article
Dalam koleksi: Final Program and Book of Abstracts: The 4th Asian Control Conference, September 25-27, 2002 (Sep. 2002), page 1874-1879.
Topik: Closed-loop; Automatic Tuning; PID Controller ; Nonlinear Systems
Fulltext: AC021723.PDF (146.36KB)

Isi artikel

In this paper, a robust control system is first proposed which is suitable for the control of a class of nonlinear systems. A parallel connection of a relay to a PID controller collectively forms the robust controller. The relay ensures robust control by providing a high feedback gain, but it also induces a control chattering phenomenon. Instead of viewing chattering as an undesirable yet inevitable feature, the chattering signals are used as natural excitation signals for identifying an equivalent PID controller using the recursive least squares (RLS) algorithm. No other explicit input signal is required. Analysis is provided on the stability properties of the control scheme. Simulation results for the level control of fluid in a spherical tank using the scheme are presented

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