Adaptive Integral Backstepping Artificial Pancreas System for Blood Glucose Regulation of Type-1 Diabetic Patients
Abstract
Diabetes Mellitus (DM) is one of the most prevailing ailments nowadays in our society. It is a metabolic disorder caused by an increase in blood glucose concentration (BGC) above the normal range with the disturbance of starchy foods, fat, and protein metabolism thereby leading to the inability of insulin secretion. An adaptive integral backstepping controller for Artificial Pancreas System (APS) is developed to address the issues of hyperglycemia and hypoglycemia episodes which are two major problems of Blood Glucose Concentration (BGC) control for type-1 diabetes mellitus (T1DM) patients as the current method is manual and based on doctor’s advice. Controllers have been designed to automate the regulation process: Proportional Integral Derivative (PID), Fuzzy Logic Controller (FLC), Sliding Mode Controller (SMC), and Integral Backstepping controller (IBC), improved glycemic performance was observed but longer settling of BGC to the basal level. The developed Adaptive Integral Backstepping Control (AIBC) addresses this problem. Firstly, the adaptive parameters of the T1DM patient’s model were developed in Simulink. Then the IBC was designed and applied to the developed model to track the basal threshold. The performance metrics of the developed AIBC system were evaluated against settling time, overshoot, and steady-state error. Simulation of AIBC when patient BG level is 230mg/dl obtained a settling time of 9.73 minutes while both controllers achieved 0% overshoot and 0 steady-state error, a 15.39% settling time improvement compared to IBC. The implication of the developed AIBC is fast steady-state tracking and better settling time, implying quick recovery of patients from hyperglycemia. Also, an impulse signal was applied to the controller (25mg/dl and 45mg/dl with a duration of 4 minutes and 8.2 minutes) which shows glucose intake by the patient as a disturbance to the system at 500 minutes, when glucose intake was 25mg/dl, patient’s model was restored to steady state using AIBC and IBC at 540 minutes and 565 minutes respectively, while at 45mg/dl it was restored at 578.2 minutes and 590.4 minutes for AIBC and IBC respectively, showing the superiority of developed controller.
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