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Chapter1Understandingproductionprocesscontrolsystem-basicknowledge1.4Topic1.4ClassificationofproductionprocesscontrolsystemOpen-loopControlSystemfeedbackControlSystemComplexControlSystemProductionProcessControlSystemStructure

ThereisonlydirectactionbetweenthecontroldeviceandthecontrolledobjectandnoreverseconnectionCase:ovenopenloopcontrolsystem特點(diǎn)Whentheswitchisclosed,differentinputvoltagesucorrespondtodifferenttemperaturest1.Open-loopControlSystemcharacteristicTheoutputofthecontrolsystemdoesnothaveanyeffectonthecontrolofthesystemThermometer

ResistiveHeateru~220Vk

ThereisonlydirectactionbetweenthecontroldeviceandthecontrolledobjectandnoreverseconnectionCase:ovenopenloopcontrolsystem特點(diǎn)Whentheswitchisclosed,differentinputvoltagesucorrespondtodifferenttemperaturest1.Open-loopControlSystemcharacteristicTheoutputofthecontrolsystemdoesnothaveanyeffectonthecontrolofthesystemThermometer

ResistiveHeateru~220Vk

ThereisonlydirectactionbetweenthecontroldeviceandthecontrolledobjectandnoreverseconnectionCase:ovenopenloopcontrolsystem特點(diǎn)Whentheswitchisclosed,differentinputvoltagesucorrespondtodifferenttemperaturest1.Open-loopControlSystemcharacteristicTheoutputofthecontrolsystemdoesnothaveanyeffectonthecontrolofthesystemThermometer

ResistiveHeateru~220Vk

ThereisonlydirectactionbetweenthecontroldeviceandthecontrolledobjectandnoreverseconnectionCase:ovenopenloopcontrolsystem特點(diǎn)Whentheswitchisclosed,differentinputvoltagesucorrespondtodifferenttemperaturest1.Open-loopControlSystemcharacteristicTheoutputofthecontrolsystemdoesnothaveanyeffectonthecontrolofthesystemThermometer

ResistiveHeateru~220VkOutput

ControltargetController（Source）Input(Temperature)DisturbanceQuantityresistiveheaterSwitchOvenBlockdiagramofopenloopcontrolsystemofincubatorActuator1.Open-loopControlSystemBlockdiagramofatypicalopenloopcontrolControllerControltargetDisturbanceActuatorOutputPre-setvalueSpecialcase:compensationbydisturbance()1.Open-loopControlSystem是開環(huán)嗎？ControltargetmanipulatedvariablemeteringequipmentCompensatingcontrollerControllerDisturbance

ControltargetSpecialcase:compensationbydisturbance()open-loopcontrolmanipulatedvariablemeteringequipmentCompensatingcontrollerControllerDisturbance

1.Open-loopControlSystemInordertocompensatetheinfluenceofthedisturbanceontheoutput,themeasurementofthedisturbancesignalproducesthecontroleffect.Becausetheoutputofthedisturbancesignalfromthemeasuringdeviceandthecontrollertothecontrolledobjectisone-waytransmission,itbelongstotheopen-loopcontrolmode是開環(huán)嗎？2.feedbackcontrolSystemItreferstothecontrolprocessinwhichthecontrollerandthecontrolledobjecthavebothpositiveandnegativeeffects.2.feedbackcontrolSystemItreferstothecontrolprocessinwhichthecontrollerandthecontrolledobjecthavebothpositiveandnegativeeffects.Case:DCmotorspeedclosed-loopcontrolsystemcharacteristic

Whenthecontrolledquantitydeviatesfromtheexpectedvalueandthedeviationoccurs,thecontroleffectwillreduceoreliminatethedeviationandmakethecontrolledquantityandtheexpectedvalueconverge.2.feedbackcontrolSystemnufueudonDisturbance(-)ugControldeviceControltargetnueudoDetectionandtransmissionsystem

givendeviceamplifier

triggerCrystalcontrollercontrolledrectifier

motor

SpeedfeedbackdeviceactuatorufBlockdiagramofatypicalclosed-loopsystem2.feedbackcontrolSystemDisturbance(-)ugControldeviceControltargetnueudoDetectionandtransmissionsystem

givendeviceamplifier

triggerCrystalcontrollercontrolledrectifier

motor

SpeedfeedbackdeviceDetectionandtransmissionsystemcontrollerDisturbancecontrolledvariable（output）（controlledquantity）manipulatedvariableCommandDeviationInput（pre-setvalue）FeedbackActuatorcontrolledobject（feedbackequipment）+-nufueudonactuatorufBlockdiagramofatypicalclosed-loopsystem2.feedbackcontrolSystemDisturbance(-)ugControldeviceControltargetnueudoDetectionandtransmissionsystem

givendeviceamplifier

triggerCrystalcontrollercontrolledrectifier

motor

SpeedfeedbackdeviceDetectionandtransmissionsystemcontrollerDisturbancecontrolledvariable（output）（controlledquantity）manipulatedvariableCommandDeviationInput（pre-setvalue）FeedbackActuatorcontrolledobject（feedbackequipment）+-nufueudonactuatorufopenloopcontrolfeedbackcontrolVSDisadvantages:controlledvariablesmayoscillateorevendiverge.ComparisonofopenloopcontrolandfeedbackcontrolAdvantages:ithastheabilitytoautomaticallycorrectdeviationsofcontrolledvariables,andcancorrecterrorscausedbychangesincomponentparametersandexternaldisturbances,withhighcontrolaccuracy.Disadvantages:thecontrolresultscannotbeautomaticallycorrected,thesystemcomponentparameterchangesandexternaldisturbanceshaveagreatimpactonthecontrolaccuracy.Advantages:simplestructure,lowcost,stablework,whentheinputsignalchangesanddisturbancescanbeknowninadvance,thecontroleff

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