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

Rohit Sharma, Amlan Basu, Sumit Mohanty

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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 in an accurately controlled way to sustain the blood glucose level of a diabetic patient. The blood sugar level of the patient 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. Using various tuning rules, the Proportional, Integral & Derivative coefficients are found. The conventional Ziegler Nicholas method produces a very high overshoot which can endanger the life of a patient. Therefore, other efficient tuning techniques like Chien-Hrones-Reswick (set-point regulation) and Chien-Hrones-Reswick (distribution regulation) methods are used here 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. The different transformation methods to convert the conventional PID into the digital PID controller are studied.
Original languageEnglish
Pages (from-to)6-11
Number of pages6
JournalSSRG International Journal of Electrical and Electronics Engineering
Issue number2
Publication statusPublished - 20 Feb 2022


  • digital PID controller
  • diabetic patients
  • blood glucose
  • Chien-Hrones-Reswick (set-point regulation)
  • Chien-Hrones-Reswick (distribution regulation)
  • MATLAB simulation

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