制动助力工作原理演示

ActuationPrincipleoffunction真空助力器制动主缸功能原理NoVacuumCondition无真空状态VacuumValve真空阀AirValve空气阀WorkingChamber工作腔VacuumChamber真空腔AirValveOpenVacuumValveClosedKeyseatedagainstrearshellPlungervalveseatedonreactiondisc空气阀打开真空阀关闭键靠在后壳体上柱塞阀顶在反作用盘上AtBalance平衡状态Patm-AmbientAtmosphericPressurePw-WorkingChamberPressurePvac-VacuumChamberPressure-Vacuuminfrontchamberpullsthediaphragmplateforward-Airvalvecloses-Vacuumvalveopens-Vacuumintheworkingchamberincreasesuntilthepressuredifferentialhasreducedto‘balance’thediaphragmplatewithboththeairandvacuumvalvesclosed-真空腔的真空吸引膜片盘向前运动-空气阀关闭-真空阀打开-工作腔内的真空增加，直至两腔压力差降低到“平衡状态”，膜片盘带动空气阀及真空阀全部关闭BrakesApplied实施制动Patm-AmbientAtmosphericPressurePw-WorkingChamberPressurePvac-VacuumChamberPressure-Forceappliedtotheinputrodopenstheairvalve-Vacuumintherearchamberdecreases,henceincreasingthepressuredifferential-Diaphragmmovesforwarduntiltheoutputrodforceisequaltotheinputforcemultipliedbytheboostratio-Reactiondiscextrudesaroundratiodisc-Whentheoutputforcebecomesgreaterthantheinputforcemultipliedbytheboostratio,thereactiondiscextrudesfurtherpushingtheplungervalvebackandclosingtheairvalveBrakesApplied实施制动Patm-AmbientAtmosphericPressurePw-WorkingChamberPressurePvac-VacuumChamberPressure-在输入杆上加力使空气阀打开-工作腔内的真空降低，因此两腔压力差增加-膜片向前运动，直到输出力等于输入力乘以助力比-反作用盘挤压包裹助力比调整盘-当输出力大于输入力乘以助力比时，反作用盘进一步挤压，推动柱塞向后退（相对阀体而言），并将空气阀关闭。BrakesReleased释放制动（减轻制动）Patm-AmbientAtmosphericPressurePw-WorkingChamberPressurePvac-VacuumChamberPressure-Vacuumvalveopens-真空阀打开-Vacuumintherearchamberincreases,hencereducingthepressuredifferential-工作腔真空增加，因此两腔压力差降低-Diaphragmplateassemblyreturnstothe‘balance’(vacuumandairvalvesbothclosed)positionduetotheactionofthemainspring-在主回位弹簧的作用下，膜片盘组件回复到“平衡状态”（空气阀及真空阀均为关闭状态）。FlowThroughaTandemBooster双腔助力器内的空气流动情形VacuumChamberPressurePVAC真空腔压力PVACWorkingChamberPressurePW工作腔压力PWAtmosphericPressurePATM大气压力PATM.LSC115THEDRshowninbalancepositionLSC115HEDR平衡状态示意图Principleoffunction–Actuation真空助力器制动主缸功能原理Pic.A零件名称Vac.nonreturnvalve真空单向阀Brakefluid制动液Boosterhousing助力器壳体Vacuumpiston真空活塞Inputrod输入杆Plunger柱塞Reactionpiston反作用杆Reactiondisc反作用盘Dilagbush前围板Poppet提升阀Atmosphericchamber大气腔（工作腔）Vacuumchamber真空腔Vac.Seal真空皮碗MChousing主缸缸体Fluidreservoir制动液贮液罐Secondarypiston第二活塞Primarypiston第一活塞Principleoffunction–Actuation真空助力器制动主缸功能原理Pic.BSymbolism符号0,8barVak真空Atmospheric大气压Splitliniebooster–mc助力器主缸分界线Poppetandsprings提升阀及弹簧Brakefluid(pressureless)制动液（小压力）Diaphragm膜片Sniffleholes补偿孔Reactiondisc反作用盘Principleoffunction–Actuation真空助力器制动主缸功能原理Pic.1Withoutvac.不通真空PFPrincipleoffunction–Actuation真空助力器制动主缸功能原理Pic.2Evacuated通真空PFPrincipleoffunction–Actuation真空助力器制动主缸功能原理Pic.3Loststroke空行程FPPrincipleoffunction–Actuation真空助力器制动主缸功能原理Pic.4Firstairintake首次进入空气FPPrincipleoffunction–Actuation真空助力器制动主缸功能原理Pic.5MCclosed主缸关闭空行程FPPrincipleoffunction–Actuation真空助力器制动主缸功能原理Pic.6Primarypressure第一腔建压PFPrincipleoffunction–Actuation真空助力器制动主缸功能原理Pic.7Sec.pistonmove第二活塞移动PFPrincipleoffunction–Actuation真空助力器制动主缸功能原理Pic.8Sec.Pressure第二腔建压PFPrincipleoffunction–Actuation真空助力器制动主缸功能原理Pic.9Loopinrange圆弧段PFPrincipleoffunction–Actuation真空助力器制动主缸功能原理Pic.10Nom.controlrange正常控制范围PFPrincipleoffunction–Actuation真空助力器制动主缸功能原理Pic.11Justbelowkneepoint拐点之下PFPrincipleoffunction–Actuation真空助力器制动主缸功能原理Pic.12Justafterkneepoint略高于拐点PFPrincipleoffunction–Actuation真空助力器制动主缸功能原理Pic.13PlungerpushedVB柱塞顶在阀体上PFPrincipleoffunction–Actuation真空助力器制动主缸功能原理Pic.14Highabovekneepoint远高于拐点PFPrincipleoffunction–Actuation真空助力器制动主缸功能原理Functionatroomtemp/Withvolumedisplac.•Applicationspeedabout3,5mm/s•Pressurerise15+/-5bar/sA)ThresholdloadB)Loopin(tolerancerange)C)Boostratio(i)D)90%kneepointpressureE)KneepointpressureF)EfficiencyG)BeginnigofairabsorbtionH)HysteresisI)10%residualpressureJ)PushbackforceK)AuxiliaryforceL)HighervacuumlevelM)FunctionwithoutvacuumMainfunctioncurveCharacteristicBoosterinputload(N)PrimarypressureMC(bar)OriginaldiagramPrincipleoffunction–Actuation真空助力器制动主缸功能原理主要功能曲线特性曲线室温性能.•加力速度约3,5mm/s•升压速度15+/-5bar/s助力器输入力(N)主缸第一腔压力(bar)A)起始力B)圆弧段上点(允差范围)C)助力比(i)D)90%拐点压力E)拐点压力F)效率G)开始抽大气H)滞后I)10%剩余压力J)回推力K)助力L)更高真空度M)无真空曲线原始图表Principleoffunction–Actuation真空助力器制动主缸功能原理Inputload输入力(N)200150100A)9“-Booster/0,8barB)10“-Booster/0,8barC)8+9“-Booster/0,8bar100200Notreinrorcedrange不需再注册系列Primarypressure第一腔压力(bar)Withoutvacuum无真空Variationsoffunctioncurve功能曲线的变化Controlrange控制范围I=3,85I=3,20I=5,60Kneepointpressure拐点压力MC-Ø=20,64mmPrincipleoffunction–Actuation真空助力器制动主缸功能原理Outputload(primarypressure)输出力（第一腔压力）Functioncurveofconventionalbooster常规助力器功能曲线ThesamecurvewillbeachievedwiththeBrakeassistantbyslowapplicationspeed带有辅助制动的助力器在慢速制动时其曲线与此相同Functioncurvefromthe„Brake-Assistant““辅助制动”功能曲线Canonlyachievedbyveryhighpedalapplicationspeed(BAandMBA)只有在快速踩制动踏时才能达到Possiblecharacteristicofboosterfunctioncurves助力器功能曲线的可能特征FunctioncurveofDual-Ratebooster双助力比助力器功能曲线NearlythesamecharacteristicathighAndslowapplicationspeed在快速和慢速实施制动时的曲线特征是相近的Inputload(pedalload)输入力（踏板力）SingleRateOperation单助力比助力器SingleRatePerformanceCurve单助力比助力器特性曲线KneepointInputOutputHelpforceRun-outLineBoostRatioThresholdPrimaryJump-inLoop-inRegion2