Fiat_Variable_Valve

Frankfurt–October2008,20thUNIAIRVariableValveActuationSystemModellingandIntegrationtotheEngineintheGT-SUITEenvironmentPaoloFerreri-CaterinaVeneziaFPT–Research&TechnologyMechanicalEngineeringandBasicTechnologiesEngineThermo-FluidDynamicSystemsDepartment2008GT-SUITEEuropeanConferenceFrankfurtamMain–October,20thUNIAIRVariableValveActuationSystemModellingandIntegrationtotheEngineintheGT-SUITEenvironment2October2008,20thContents•Introduction•TheUNIAIRactuatortechnology•ModellingoftheUNIAIRactuatorintheGT-SUITEenvironment•Comparisonbetweensimulationresultsandexperimentaldata•Integrationoftheactuatormodel(GT-FUEL)totheengineone(GT-Power)•Sampleanalysisusingtheintegratedmodel•FinalremarksandconclusionsContentsIntroductionUNIAIRTechnologyGT-SUITEactuatormodellingSimulationsvsexperimentsActuatormodeltoEnginemodelintegrationSampleanalysisusingtheintegratedmodelFinalremarksandconclusionsUNIAIRVariableValveActuationSystemModellingandIntegrationtotheEngineintheGT-SUITEenvironment3October2008,20thIntroduction•Activityobjectives•developmentofamodeloftheUNIAIRvariablevalveactuationsystemintheGT-SUITEenvironment•integrationoftheactuatormodeltotheengineoneinauniqueenvironment•Integratedsimulations:why?•simulation,inengineapplicationscharacterizedbyadditionalcamlobeslikeinternalEGRlobesandenginebrakinglobes,oftheeffectontheUNIAIRvalveliftofthegaspressures,variablewithenginespeedandload•Integratedsimulations:todowhat?•internalEGRanalyses•enginebrakinganalyses•actuatordesignoptimizationContentsIntroductionUNIAIRTechnologyGT-SUITEactuatormodellingSimulationsvsexperimentsActuatormodeltoEnginemodelintegrationSampleanalysisusingtheintegratedmodelFinalremarksandconclusionsUNIAIRVariableValveActuationSystemModellingandIntegrationtotheEngineintheGT-SUITEenvironment4October2008,20thTheUNIAIRActuatorTechnology(1/2)TheUNIAIRActuatorTechnology(1/2)AnoilvolumeisinterposedbetweenthecamandthevalveThepistonactsasapump,beingitseffectivedisplacementcontrolledbyanormallyopenedsolenoidvalveTheoillayoutisdividedinhighpressureandmediumpressurezonesThevalveseatingvelocityiskeptbehindsafethresholdsbythehydraulicbrakeorificesAnaccumulatorpistonisprovidedinthemediumpressurecircuitfortheactuatorfillingrecoveryaftervalveliftcontrol(LIVO,EIVC)ThesystemcommunicatestotheenginelubricationsystemforthefluidlossesrecoveryContentsIntroductionUNIAIRTechnologyGT-SUITEactuatormodellingSimulationsvsexperimentsActuatormodeltoEnginemodelintegrationSampleanalysisusingtheintegratedmodelFinalremarksandconclusionsUNIAIRVariableValveActuationSystemModellingandIntegrationtotheEngineintheGT-SUITEenvironment5October2008,20thTheUNIAIRActuatorTechnology(2/2)TheUNIAIRActuatorTechnology(2/2)EIVC↔solenoidvalvedeactivatedbeforethecamclosingangle(Φ2control)LIVO↔solenoidvalveactivatedafterthecamopeningangle(Φ1control)ValveliftcontrolsContentsIntroductionUNIAIRTechnologyGT-SUITEactuatormodellingSimulationsvsexperimentsActuatormodeltoEnginemodelintegrationSampleanalysisusingtheintegratedmodelFinalremarksandconclusionsUNIAIRsystembenefits-‘cycle-by-cycle’and‘cylinder-by-cylinder’fullyvariablevalveactuation-volumetricefficiencyoptimizationoverthewholeenginespeedsrange-handlingofade-throttledengine-handlingofadditionalcamlobesUNIAIRVariableValveActuationSystemModellingandIntegrationtotheEngineintheGT-SUITEenvironment6October2008,20thNOTE:ThepicturerepresentstheactuatorsoftwovalvesPumppistonunitHydraulicbrakeunitFlowcontrollerPumpdrivingsystemSolenoidvalveUNIAIRsystem–ActuatorarchitectureoverviewHighpressurecircuitConsideredapplication:turbochargedDieselengineContentsIntroductionUNIAIRTechnologyGT-SUITEactuatormodellingSimulationsvsexperimentsActuatormodeltoEnginemodelintegrationSampleanalysisusingtheintegratedmodelFinalremarksandconclusionsoilcircuitUNIAIRVariableValveActuationSystemModellingandIntegrationtotheEngineintheGT-SUITEenvironment7October2008,20thGT-SUITEsketchoftheUNIAIRVariableValveActuationSystempumppistonunitsolenoidvalveflowcontrolleraccumulatorunitinletcheckvalveoilsupplyvalveunitHLAhydraulicbrakeunitoilcircuitgaspressuresinterfaceContentsIntroductionUNIAIRTechnologyGT-SUITEactuatormodellingSimulationsvsexperimentsActuatormodeltoEnginemodelintegrationSampleanalysisusingtheintegratedmodelFinalremarksandconclusionsUNIAIRVariableValveActuationSystemModellingandIntegrationtotheEngineintheGT-SUITEenvironment8October2008,20thGT-SUITEsketchoftheUNIAIRVariableValveActuationSystemDetailsonthepumppistonunitmodellingmotionimposedbythepumpdrivingsystempumppistonmass+springoilleakagepumppistonoilchambercrank_angle[deg]lift[mm]iEGRlobeMAINlobeContentsIntroductionUNIAIRTechnologyGT-SUITEactuatormodellingSimulationsvsexperimentsActuatormodeltoEnginemodelintegrationSampleanalysisusingtheintegratedmodelFinalremarksandconclusionsUNIAIRVariableValveActuationSystemModellingandIntegrationtotheEngineintheGT-SUITEenvironment9October2008,20thGT-SUITEsketchoftheUNIAIRVariableValveActuationSystemDetailsonthehydrauliclashadjustermodellingcontacttothebrakepistoncontacttothevalveplungerhousingoilleakage