Research On Fuzzy-PID Control System Of Sleep Respirator

Obstructive sleep apnea syndrome (OSAS) is the most common sleep breathesobstacle disease, which is a serious potential threat to the mankind's health.Respirator of continuous positive airway pressure (CPAP) is mostly used to treatOSAS . As respirator has no wounds and has good curative effect to OSAS,CPAPrespiraor has already become the first-selected method to treat OSAS now.Atpresent respiraor can change its performance by changing the software of controlsystem,it is not necessary to changing the hardware and structure of respirator.So Ido research for the control system of CPAP respirator.At present respirator adoptscontrol algorithms of PID in the control system.But the control process of thepressure and flow of respirator is non-linear.If the system adopts the PID controlmethod,it can't get the satisfied result after simplifying the system. The fuzzy-PIDcontrol of sleep respirator of this paper belongs to the microcomputer controltechnology and man-machine efficacy field.This paper combines the fuzzy-PIDcontrol theory and singlechip technology, studies the fuzzy –PID controller ofrespirator,it is in the precondition of the high-speed development of machineventilate technology and singlechip technology and control system.It adapt well tothe development trend —importing the intelligent control to respirator controlsystem.The work of this paper are as follows:At first, analyse the structure and work principle of the sleep respirator.Secondly, the paper introduces in detail the principle and arithmetic offuzzy-PID control.Contrasting fuzzy-PID control and fuzzy control and PIDcontrol,analyse the advantange of fuzzy-PID control. Validate the feasibility offuzzy-PID control used in respirator in allusion to the fact of respirator. Conformthe project of coordinating parameter automation fuzzy-PID controller.Thirdly,the paper introduce in detail the design process of fuzzy-PIDcontroller that is control step motor.In MATLAB software I make use ofFuzzyTools building the fuzzy illation system of respirator.Fouthly,in the aspect of hardware of control system,mainly design the samplecircuit,singlechip and exterior interface circuit,perform component circuit,anti-jamming circuit etc.In the design of the sampling circuit, this paper has chosenthe sensor of 163PC01D36 and 163PC01D48 which belongs to 160 series thatHoneywell Company produced, chosen AD7501 as multiplexer and AD751 as A/Dcommutator.The singlechip system part select AT89C51RC as data processing andcontrol chip. The singlechip microcomputer needs to be expanded its RAM and I/Ointerface. Anti-jamming part design the watch dog timer of the singlechipAT89C51R ,and design anti-jamming of electromagnetism publish board.fifthly,in the aspect of control systematic software design, make use of Clanguage and assemble language designing every function module.The functionmodule mainly include :data sampling module,data filter module,fuzzy-PIDcontrol module, software anti-jamming module. I make use of SIMULINKtoolbox building fuzzy-PID system simulation diagram. The simulation result offuzzy-Pid and PID shows that fuzzy-PID control has the better character of littleexcess adjust,high-speed response,well dynamic response,high stable stateprecision .The simulation shows that fuzzy-pid control can be used to sleeprespirator control system and can have a good control effect.It is feasible and essential to apply fuzzy-PID control to the sleep respirator,because of the limitations of time and energy, and the initial exploration, the studyis only a beginning, deficiency exist yet in the thesis.The design of paper isapplication system of singlechip,as MCS-51 in the stand-alone mode has deficiencyin the aspect of real time,we can take Digital Signal Process(DSP) or doublesinglechip module into account in the design for the future.