KEYWORDS: Control systems, Data modeling, Systems modeling, Fuzzy logic, Error analysis, Mathematical modeling, Actuators, Process control, Computer simulations, Device simulation
Intelligent valve positioner is the main part of pneumatic actuator. Intelligent valve positioner exhibits nonlinear and
time-varying properties that cannot be captured by any existing model, so it is difficult to satisfy its requirement for high
accuracy and fast speed through the use of a single control method. We propose a fuzzy-PID control method based on a
grey model, which combines fuzzy control with PID control, and the system provides inherently more accurate
predictions. To address the potential problems of the fast increasing serie's dimension and an over-capacity of micro
controller unit (MCU) as a result of frequent measurements by the grey model, we introduce a grey model of equal
dimension and the recursive least-squared method, which keep the matrix dimension constant, reduce the computation
load and ensure real-time results. Our simulations confirm that our method provides rapid response, high accuracy and
superior anti-interference capability. Our experiment proves that the intelligent valve positioner can be successfully
applied to solve real-world problems.
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