Adaptive control system having hedge unit and related apparatus and methods

a technology of adaptive control system and hedge unit, applied in adaptive control, process and machine control, instruments, etc., can solve the problems of affecting the adaptive control system, reducing the control response of adaptive control system, and causing instability

Inactive Publication Date: 2007-06-14
GEORGIA TECH RES CORP
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  • Abstract
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  • Claims
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Problems solved by technology

However, conventional adaptive control systems have a tendency to adapt to plant or control system characteristics to which they should not.
The control response of adaptive control systems can be greatly diminished when subjected to certain characteristic(s) of the plant or system, and can be rendered unstable in attempting to adapt to these characteristics.
An example of a characteristic that could adversely affect an adaptive control system is a control or authority limit imposed on the control elements of an adaptive control system.
If an operator generates a command signal that exceeds the ability of the control system or plant to respond, adaptation of the control system can render the control system unstable.

Method used

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  • Adaptive control system having hedge unit and related apparatus and methods
  • Adaptive control system having hedge unit and related apparatus and methods
  • Adaptive control system having hedge unit and related apparatus and methods

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Embodiment Construction

[0022] As used herein, the following terms have the following definitions:

[0023]“Actuator” can be virtually any device capable of affecting the state of a plant to control a degree of freedom thereof. Such actuator can be a motor, motor-driven screw, a hydraulic cylinder, a pump or valve controlling a stream of air, a thermal heater, a compressor or suction generator, or other device.

[0024]“Adaptive control system” means a control system having the capability to adapt to changes in a controlled plant or its environment over time.

[0025]“Characteristic” is a property of a plant or control system that has an effect for which adaptation of the control system is not to be performed. The characteristic can be a time delay between generation of a command signal and sensing and report of the plant state resulting from the command signal to the control system. The characteristic can also be a control limit such as actuator end points, e.g., extreme positions, temperatures, pressures, etc....

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Abstract

The invention includes an adaptive control system used to control a plant. The adaptive control system includes a hedge unit that receives at least one control signal and a plant state signal. The hedge unit generates a hedge signal based on the control signal, the plant state signal, and a hedge model including a first model having characteristics of the adaptive control system and plant to which the adaptive control system is not to adapt. The hedge signal is used in the adaptive control system to remove the effects of the characteristics from a signal supplied to an adaptation law unit of the adaptive control system so that the adaptive control system does not adapt to the characteristics in controlling the plant.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation under 35 U.S.C. §120 and 37 C.F.R. §1.53(b) of copending U.S. patent application Ser. No. 10 / 602,458, filed on Jun. 23, 2003 which is a continuation of U.S. patent application Ser. No. 09 / 585,106, filed on May 31, 2000, which application claimed the benefit of provisional application no. 60 / 199,615, filed Apr. 25, 2000, which are hereby incorporated herein in their entirety by reference.STATEMENT OF U.S. GOVERNMENT RIGHTS IN THE INVENTION [0002] This invention was made with U.S. Government funding under Contract No. NAG8-1638 awarded by the National Aeronautics and Space Administration (NASA)—Marshall Space Flight Center and Contract No. F49620-98-1-0437 awarded by the Air Force Office of Scientific Research (AFOSR). The U.S. Government has certain rights in the invention.FIELD OF THE INVENTION [0003] The invention is directed to an adaptive control system and related method. More particularly, the inv...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G05B13/02G05B13/04
CPCG05B13/027G05B13/04G05B13/041
Inventor JOHNSON, ERIC NORMANCALISE, ANTHONY J.
Owner GEORGIA TECH RES CORP
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