Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/7433
標題: 雙陽壓呼吸器之控制系統設計與實作
Design and Implementation of a Bi-level Positive Airway Pressure Control System
作者: 陳志松
Chen, Chih-Sung
關鍵字: Bi-level positive airway pressure
雙陽壓呼吸器
The continuous positive airway pressure machine
Obstructive Sleep Apnea
連續正陽壓呼吸器
阻塞性呼吸中止症
出版社: 電機工程學系所
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摘要: 本論文的研究目的是以雙自由度控制方法完成治療呼吸中止症(Obstructive sleep apnea,OSA)之雙陽壓(Bi-level positive airway pressure,Bi-PAP)呼吸器系統。系統控制架構於數位訊號處理器為基礎的直流無刷馬達閉迴路控制,並藉由驅動鼓風葉扇,以獲得所需氣壓來源。全系統開迴路數學模型的建立係採用遞迴式最小平方估測法推算出系統輸入與輸出動態模型參數。全系統閉迴路雙自由度控制係結合輸入前饋迴路與輸出回授迴路,以完成轉速與風壓雙自由度控制,輸入前饋控制為非線性物理量控制,輸出回授控制是應用增益排程PID控制器,以達成雙陽壓二高、低輸入控制量平穩的控制。本文另提出三種呼吸週期預估法,用以預估下一呼吸週期與計算下一吸氣時間長短。經實驗結果證明本文所提之控制策略可快速且有效的達成雙陽壓切換呼吸器的壓力追蹤,並能自動偵測吸氣壓力、呼吸週期及預估下週期吸氣的時間,達成應用於治療呼吸中止症之自動雙陽壓的壓力追蹤控制。
This paper presents a two degree-of-freedom control method for achieving bi-level positive airway pressure (Bi-PAP)of an obstructive sleep apnea (OSA) treatment system. A closed-loop DC brushless motor together with a blower and an airway module is controlled by a PI controller and then implemented using a microchip (dsPIC30F3010). With this closed-loop airway controlled module, a mathematical model of the overall open-loop system is established based on the input-output data and its system parameters are sequentially determined using the recursive least-squares (RLS) approach. A two degree-of-freedom (DOF) controller, including a nonlinear feedforward controller and a gain scheduling proportional-integral-derivative (PID) feedback controller is proposed to follow the desired bi-level pressure setpoints. Human breathing periods, including inhalation and exhalation, are estimated in order to automatically provide appropriate inhalation time for the patient. Through experimental results, the proposed control method is shown useful in achieving bi-level airway pressure tracking.
URI: http://hdl.handle.net/11455/7433
其他識別: U0005-0908200708292500
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-0908200708292500
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