| Grey fuzzy PI control for packing pressure during injection molding process
Shuo Wang, Ji Ying*, Zichen Chen, Kan Cai
The Journal of Mechanical Science and Technology, vol. 25, no. 4, pp.1061-1068, 2011
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.
Keyword : Injection molding; Packing pressure; Grey system; Fuzzy control |
