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Bioreactor pH Control System Using Interval Type-2 Fuzzy PID Controller
Songyang An1, Haotian Xu1, Jizheng Zhong1
1Hubei Key Laboratory of Modern Manufacturing Quantity Engineering, School of Mechanical Engineering, Hubei University of Technology, Wuhan, China.
Abstract:
In cell culture, maintaining a stable and optimal pH level is critical for ensuring proper cellular growth. This study presents the design of a pH control system specifically tailored for this application, utilizing an algorithm that integrates interval type-2 fuzzy control with traditional PID control strategies. The hardware component of the control system employs an STM32 microcontroller, while the software is developed based on the process characteristics of the controlled system. The PID, type-1 fuzzy PID, and interval type-2 fuzzy PID algorithms are assessed through both simulations and experiments. The results demonstrate that the proposed interval type-2 fuzzy PID control algorithm shows reduced overshoot, enhanced control accuracy, and improved response time. Furthermore, it demonstrates a faster recovery rate when subjected to disturbances, rapidly reaching steady-state conditions and effectively fulfilling the requirements for pH regulation in cell culture.
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