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1、自动控制装置仪表论文（Automaticcontroldevice,instrument,thesis）DOCdocumentsmayexperiencepoorbrowsingontheWAPside.ItisrecommendedthatyoufirstselectTXT,ordownloadthesourcefiletothelocalview.Introduction:openloopcontrolsystemstructureandcontrolissimple,anti-interferenceability,lowcontrolprecisi
2、on,isgenerallyusedtocontrolperformancerequirementsoftheoccasion,thegreenhouseautomaticcontrolsystemisaclosed-loopcontrolsystemconsistsofC51microcontroller,A/Dconversioncircuit,temperaturedetectioncircuit,humiditydetectioncircuitandcontrolsystem.Thetemperaturedetectioncircuitwillde
3、tectthetemperatureintothevoltage,theanalogvoltageisconvertedintoC51,MCU,MCUbycomparingtheinputtemperatureandthesettemperaturetocontrolthefanorelectricdrivecircuit,whentheindoortemperaturewithinthepresetrange,SCMwrongsprinklerorelectricactionmadeby.Theindoortemperatureandairhumidit
4、yaredetected,monitored,andthetemperatureandhumidityrangecanbetreatedinrealtime,sothattheindoorenvironmentiswellcontrolled.PrincipleofproportionalcalculuscontrolPIDcontrolalgorithmissimple,stableandreliable.Itiswidelyusedinprocesscontrolandmotioncontrol,especiallyfordeterministicsy
5、stemswhichcanestablishaccuratemathematicalmodel.Proportionalintegralregulator(PD)1.1proportionalintegralregulator(PD)Theproportionalregulatorhastheerror.Inordertosolvethisproblem,theintegrallinkcanbeintroduced,andtheproportionaldifferentialregulatorcanproduceacontrolactionratiotoa
6、nychangeoftheerror,whichcanpreventthechangeoftheerror.ThefastertheCchanges,thegreaterthePD,andthegreatertheoutputcorrection.Ithelpstoreduceovershoot,overcomeoscillations,stabilizethesystem,speeduptheresponseofthesystemandreducetheadjustmenttime,thusimprovingthedynamiccharacteristi
7、csofthesystem.Itsdisadvantageisitspooranti-interferenceability.1.2PIDregulatorTheintegratorcaneliminatetheerrorandimprovetheprecision,buttheresponsespeedofthesystemisslowandthestabilityisworse.Thedifferentiatorincreasesstabilityandspeedsupresponse.Thescaleisthebasiclink.Thecombina
8、tionofthethreeandtheselectionofap
