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1、ThesignificanceofPIDcontrolThecurrentlevelofindustrialautomationindustriestomeasurethelevelofmodernizationhasbecomeanimportantsymbol.Meanwhile,thecontrolalsoexperiencedthedevelopmentofthetheoryofclassicalcontroltheory,moderncontroltheoryandintelligentcontroltheoryofthrees
2、tages.Intelligentcontrolisatypicalexampleoffuzzyautomaticwashingmachine.Open-loopcontrolsystemcanbedividedintocontrolsystemsandclosed-loopcontrolsystem.Acontrolsystemincludingcontroller,sensors,transmitters,actuators,inputandoutputinterfaces.Controller'soutputthroughtheou
3、tputinterface,theimplementingagency,addedtothechargedsystem;controlsystem,theamountcharged,throughsensors,transmitters,senttothecontrollerthroughtheinputinterface.Differentcontrolsystems,sensors,transmitters,actuatorsarenotthesame.Suchaspressurecontrolsystempressuresensor
4、tobeused.Electricheatingcontrolsystemsensorisatemperaturesensor.Atpresent,PIDcontrolandcontrollerorintelligentPIDcontroller(instrument)hasalotofproductshavebeenintheengineeringpracticehasbeenwidelyapplied,thereisawiderangeofPIDcontrollers,themajorcompanieshavedevelopedPID
5、parameterself-tuningcapabilitiesofintelligentcontroller(intelligentregulator),whichautomaticallyadjuststhePIDcontrollerparametersareadjustedthroughtheintelligentorself-correction,adaptivealgorithmstoachieve.PIDcontrolareachievedusingpressure,temperature,flow,liquidlevelco
6、ntroller,PIDcontrolcanachieveprogrammablecontroller(PLC),alsoallowsPIDcontrolofPCsystems,etc..ProgrammableLogicController(PLC)istousetheclosed-loopPIDcontrolmoduletoachievecontrol,programmablelogiccontroller(PLC)canbeconnecteddirectlywithControlNet,suchasRockwell'sPLC-5an
7、dsoon.PIDcontrolfunctionalsoallowsthecontroller,suchasRockwell'sLogixproductline,whichcanbeconnecteddirectlywithControlNet,usethenetworktoachieveitsremotecontrolfunctions.1,theopen-loopcontrolsystemOpen-loopcontrolsystem(open-loopcontrolsystem)ischargedwiththeobject8outpu
8、t(controlledvariables)onthecontroller(controller)didnotaffecttheoutput.Inthiscontrolsystem,notde
