Grey fuzzy PI control for packing pressure during injection molding process |
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Authors: | Shuo Wang Ji Ying Zichen Chen and Kan Cai |
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Affiliation: | (1) The University of Sydney School of Aerospace, Mechanical and Mechatronic Engineering, Sydney, NSW, Australia |
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Abstract: | This study presents a grey fuzzy PI (GFPI) controller for packing pressure control during the injection process. The novel
controller was designed for solving the problems of large overshoot, static error, and long delay time on servo motor-driven
injection molding machines. Based on reasonable assumptions, a mathematical model of injection system was established. According
to the nonlinear, severe interferences, and long delay time characteristics in injection process, this paper integrates predictive
grey system, robust fuzzy ratiocination, and PI control. Using these mathematical model and control algorithms, a GFPI controller
is implemented into an MCU using C programming techniques. The integral discrete PID controller and solid fuzzy controller
were realized for contrast experiments. The experimental results show that GFPI controller had better performance on reducing
overshoot and static error, increasing both response rate and repeatable accuracy. Such a developed technology would provide
helpful references for designing the controller of energy-saving servo motor-driven injection molding equipment. |
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