Amelioration of digital PID controller performance for blood glucose level of diabetic patient

Sharma, Rohit and Basu, Amlan and Mohanty, Sumit (2022) Amelioration of digital PID controller performance for blood glucose level of diabetic patient. SSRG International Journal of Electrical and Electronics Engineering, 9 (2). pp. 6-11. ISSN 2348-8379 (https://doi.org/10.14445/23488379/IJEEE-V9I2P102)

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Abstract

The background of this paper discusses the design of a digital PID (Proportional-integral derivative) controller for controlling the blood glucose level of a diabetic patient. The objective is to design a digital PID controller for external insulin injection, which can inject insulin to the patient accurately to sustain the blood glucose level of a diabetic patient. The patient's blood sugar level is considered as input variable & injected insulin level is considered as output variable, which is to be controlled. A dynamic model is constructed & a transfer function is defined for this system. The Proportional, Integral & Derivatives coefficients are found using various tuning rules. The conventional Ziegler Nicholas method produces a very high overshoot that can endanger a patient's life. Therefore, other efficient tuning techniques like Chien-Hrones-Reswick (set-point regulation) and Chien-Hrones-Reswick (distribution regulation) methods are used to find the Proportional, Integral & Derivative coefficient. The tuning responses are studied & parameters are compared. The best response given by the PID is converted into Digital PID. Different transformation methods are studied to convert the conventional PID into the digital PID controller.

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