DocumentCode :
3211827
Title :
Actuator fault tolerant control for an artificial pancreas
Author :
Vega-Hernández, O. ; Campos-Delgado, D.U. ; Espinoza-Trejo, D.R.
Author_Institution :
CIEP, UASLP, San Luis Potosi, Mexico
fYear :
2009
fDate :
10-13 Jan. 2009
Firstpage :
1
Lastpage :
6
Abstract :
With advances in continuous glucose sensors and portable insulin pumps, the concept of an artificial pancreas is now feasible. However, due to continuous operation, the actuator in this system could fail in some degree. In this sense, this paper addresses model-based fault diagnosis using a glucose-insulin model developed by Hovorka et al. (2004), and extended with an interstitial compartment to reproduce subcutaneous glucose measurements. First, a nominal feedback controller is designed following a pole-placement technique and internal model principle. In addition, a feedforward action is included to compensate fast glucose excursions due to meals. For fault diagnosis purposes, meals are considered as partially known perturbations in the system, so their information is appended into the glucose-insulin model as an exosystem with nominal initial conditions. A nonlinear PI observer is then designed using the extended glucose-insulin model to generate a dedicated residual for fault diagnosis. After fault detection and identification, the controller gain is modified in order to compensate the effect of the fault. These ideas are validated in simulation under a closed-loop configuration, and fault conditions of sub and over-dosing in the insulin pump.
Keywords :
PI control; actuators; artificial organs; biosensors; closed loop systems; control system synthesis; fault tolerance; feedback; feedforward; medical control systems; nonlinear control systems; observers; pole assignment; sugar; actuator fault tolerant control; artificial pancreas; closed-loop configuration; continuous glucose sensors; extended glucose-insulin model; fault detection; fault effect compensation; fault identification; feedforward action; internal model principle; meals; model-based fault diagnosis; nominal feedback controller design; nonlinear PI observer; pole-placement technique; portable insulin pumps; subcutaneous glucose measurements; Actuators; Automatic control; Blood; Fault diagnosis; Fault tolerance; Insulin; Medical services; Pancreas; Sliding mode control; Sugar; Artificial pancreas; fault accommodation; fault diagnosis; health care systems safety;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Engineering, Computing Science and Automatic Control,CCE,2009 6th International Conference on
Conference_Location :
Toluca
Print_ISBN :
978-1-4244-4688-9
Electronic_ISBN :
978-1-4244-4689-6
Type :
conf
DOI :
10.1109/ICEEE.2009.5393405
Filename :
5393405
Link To Document :
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