Method and device for tuning and control

US7937165B2 · kind B2 · utility

Assignee

• ABB AB · SE

Inventors

• Per-Erik Moden · Västerås, SE
• Pontus Bergsten · Västerås, SE
• Rickard Lindkvist · Hagfors, SE

Key dates

• Filing date: Dec 18, 2006
• Grant date: May 3, 2011
• Expiry date: Jul 11, 2027

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T409/307224
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A method and a device for tuning and control of industrial processes having varying material flow rate. An adder is configured to add excitation signals to the controller output signal. A measurement system is configured to measure a property in response to the excitation signals. A model based tuning unit is adapted to estimate the value of at least one parameter with unknown value of a process model structure describing the effect of varying material flow rate, based on the measurements of the property and the output signal from the controller, and to calculate a model that describes the dynamics from controller output to controller input based on the estimated value of the parameter, and to perform model based tuning of the controller based on the model that describes the dynamics from controller output to controller input.