Use of saturation relay feedback in PID controller tuning
US5742503A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 25, 1996 |
| Grant date | Apr 21, 1998 |
| Priority date | — |
| Expiry date | Mar 25, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B13/042
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method and an apparatus are provided for autotuning a parameter of a PID controller which is employed in a transfer function. The method includes steps of (a) providing a first specific value for the transfer function; (b) computing a first ultimate parameter of the transfer function in response to the first specific value; (c) modifying the first specific value in response to the first ultimate parameter in order to obtain a second specific value; (d) generating a second ultimate parameter for a characteristic of the transfer function in a specified range in response to the second specific value; (e) obtaining a precise parameter of the PID controller in response to the second ultimate parameter. The autotuning apparatus includes; a controlled device outputting a first ultimate parameter and a second ultimate parameter, respectively in response to a first input signal and a second input signal; a nonlinear element connected to the controlled device, and outputting a first specific signal and a second specific signal in response to a first ultimate parameter; and a control unit connected to the nonlinear element, wherein the nonlinear element outputs the second input signal to ca…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.