Sheraz A. Babar, Pakistan
National University of Sciences and Technology, NUST School of Electrical Engineeringand Computer SciencesPresenter of 2 Presentations
BACKSTEPPING CONTROLLER DESIGN FOR AUTOMATIC STABILIZATION OF BLOOD-GLUCOSE LEVEL USING ARTIFICIAL PANCREAS IN TYPE 1 DIABETES
Abstract
Background and Aims
To regulate blood glucose of a diabetic patient; artificial pancreas is used to externally infuse insulin in the patient body. This work presents the design and analysis of the nonlinear controller that enables the automatic regulation of blood glucose level in type-1 diabetic patients.
Methods
We have proposed a Lyapunov based nonlinear Backstepping controller. In Berman’s Minimal Model, the meal disturbance phenomenon is considered as fixed value. One of the enhancements that we have introduced is the annexure of the variable meal disturbance as a dynamic state to the existing BMM. The asymptotic stability of the system is proven via mathematical analysis using Lyapunov theory.
Results
To demonstrate the performance of the proposed controller, simulations are carried out through MATLAB/Simulink and results of the proposed controller has been compared with PID controller.
Conclusions
The propsed nonlinear controller enables the automatic regulation of blood glucose level far better than PID controller.
SLIDING MODE PLUS BACKSTEPPING CONTROLLER FOR ARTIFICIAL PANCREAS IN TYPE 1 DIABETES
Abstract
Background and Aims
Diabetes Type 1 is caused when body is deficient of required insulin quantity to maintain blood glucose level; due to unavailability of Pancreatic
beta cells. Artificial Pancreas facilitates Type 1 diabetes Mellitus to have automatic stabilization of blood glucose level using some controller. In this research work, we have proposed Backstepping Sliding Mode Controller for Artificial Pancreas in Type 1 diabetes Mellitus.
Methods
We have used Extended Bergman’s Minimal Model that presents the relation between glucose and insulin for Type 1 Diabetic patient with fixed known meal disturbance but have meal disturbance as a 4th state. Then we designed Lyapunov based robust backstepping nonlinear controller for stabilization of blood-glucose level.
Results
The analysis through Lyapunov theory proves the global asymptotic stability of the system. The proposed controller has been compared with PID controller in MATLAB/Simulink.
Conclusions
The performance of the proposed controller has been proved to be far better than conventional PID controller.