Auto-tuning controller using loop-shaping
AssigneeHoneywell International Inc.
InventorsSujit V. Gaikwad, Sachi K. Dash, Kosta S. Tsakalis, Gunter Stein
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Abstract
A method and apparatus for automatically adjusting the gains of a feedback controller while the process continues to run and the controller continues to operate and control the process is disclosed. A desired closed-loop control bandwidth and a target loop transfer function are specified by the operator, and the tuning is accomplished automatically with minimal operator intervention and without the need for developing a model of the process. The automatic tuner subjects the process to one or more disturbance and the operation of both the process and the controller are monitored.
Claims25
A method for determining one or more new gains for a controller while the controller continues to control a process towards a target loop transfer function, the controller receiving a process output signal and a process set point signal and providing a controller output signal, the method comprising the steps of:
- introducing a disturbance into the controller output signal to form a process input control signal, wherein the process input control signal is input to the process;
- calculating one or more new gains for the controller using the controller output signal, the process input control signal, and the target loop transfer function, and without requiring an output signal from the process;
- using the one or more new gains in the controller to subsequently control the process.
A tuning device for tuning one or more new gains of a controller while the controller controls a process towards a target loop transfer function, the controller receiving a process output signal and a process set point signal and providing a controller output signal, the gain tuning device comprising:
- disturbance generating means for generating a disturbance in the controller output signal to form a process input control signal, wherein the process input control signal is input to the process;
- calculating means for calculating one or more new gains of the controller using the controller output signal, the process input control signal, and the target loop transfer function, and without requiring an output signal from the process;
- providing means for providing the one or more new gains to the controller, whereby the controller uses the new gains to subsequently control the process.
Dependencies are inferred from the claim text.