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1、PumpControlPumpControlDarrinEatonDate:May2007IntroductionIntroduction•Instructorbackground•Purposeofthecourse•Studentmaterials•Coursestructure(instruction,labexercises,machines)•Hoursofcourse–start,finish,breaks2PumpControlTheoryofOperationTheoryofOperationPistonpumpsproduc

2、eoilflowwiththepumpingactionofthepistonscontainedintherotarygroup.3PumpControlPressureGenerationPressureGenerationPressureisproducedinahydraulicsystemwhenthereisaresistancetoflow.Example:Ifthepowermanifolddumpvalveisopen,thereisnownoresistancetopumpflowandthesystempressures

3、etpointcannotbeachieved.4PumpControlVariableDisplacementVariableDisplacementAfixeddisplacementpumpOutputflowfromavariabledeliversthesameamountofoildisplacementpumpcanbeforeveryrotation.controlled.5PumpControlVariableDisplacementVariableDisplacementOnstrokeOffstrokeThedispla

4、cementofapistonpumpischangedbymovingtheswashplateangle.6PumpControlPressureCompensationPressureCompensationPressureCompensationisusedinconjunctionwithvariabledisplacementpumps.Theeventthattriggersthepumpcontroltode-stroketherotarygroupisthesystempressurereachinganadjustable

5、setpoint.7PumpControlPumpControl8PumpControlControlSchematic(DRG)ControlSchematic(DRG)9UnloadLoadUnloadLoad10PumpControlPumpControl11PumpControlControlSchematic(FE)ControlSchematic(FE)12ElectronicControlElectronicControl-10Vdc-+10Vdc-10Vdc-+10Vdc13PumpControlElectronicContr

6、olElectronicControl1PressurecommandfromIPC0-10Vdc(seeValvesStatus)Thisinputwillbejumperedtothecardinternalpowersupply(14Vdc)ispressurecontrolisnotused.2Actualpressure0-10Vdc(0Vdcifnotransducer)3FlowcommandfromIPC0-10Vdc(seeValvesStatus)4Actualflow(swashplateangle)-1.0Vdc-+1

7、0Vdc(lowVdc=lowflow)5PQvalvecommand-10Vdc-+10Vdc6PQvalvespoolposition(actual)-10Vdc-+10Vdc14PumpControlElectronicControl(masterElectronicControl(master--master)master)15PumpControlElectronicControl(masterElectronicControl(master--slave)slave)16PumpControlPumpAssemblyPumpAss

8、embly•Note1:Thisvideoisforillustrationonly.Donotdisassembleapumpwithoutthepresence