高频通气的模糊控制与传统控制

Fuzzy and conventional control of high-frequency ventilation.

作者信息

Noshiro M, Matsunami T, Takakuda K, Ryumae S, Kagawa T, Shimizu M, Fujino T

机构信息

Division of Electronic Engineering, Tokyo Medical and Dental University, Japan.

出版信息

Med Biol Eng Comput. 1994 Jul;32(4):377-83. doi: 10.1007/BF02524688.

DOI:10.1007/BF02524688

PMID:7967801

Abstract

A high-frequency ventilator was developed, consisting of a single-phase induction motor, an unbalanced mass and a mechanical vibration system. Intermittent positive pressure respiration was combined with high-frequency ventilation to measure end-tidal pCO2. Hysteresis was observed between the rotational frequency of the high-frequency ventilator and end-tidal pCO2. A fuzzy proportional plus integral control system, designed on the basis of the static characteristics of the controlled system and a knowledge of respiratory physiology, successfully regulated end-tidal pCO2. The characteristics of gas exchange under high-frequency ventilation was approximated by a first-order linear model. A conventional PI control system, designed on the basis of the approximated model, regulated end-tidal pCO2 with a performance similar to that of the fuzzy PI control system. The design of the fuzzy control system required less knowledge about the controlled system than that of the conventional control system.

摘要

研发了一种高频呼吸机，其由单相感应电动机、不平衡质量和机械振动系统组成。将间歇正压呼吸与高频通气相结合以测量呼气末二氧化碳分压（end-tidal pCO2）。在高频呼吸机的旋转频率与呼气末二氧化碳分压之间观察到滞后现象。基于受控系统的静态特性和呼吸生理学知识设计的模糊比例加积分控制系统成功地调节了呼气末二氧化碳分压。高频通气下的气体交换特性由一阶线性模型近似。基于该近似模型设计的传统比例积分（PI）控制系统调节呼气末二氧化碳分压的性能与模糊PI控制系统相似。与传统控制系统相比，模糊控制系统的设计所需的关于受控系统的知识更少。