約束系統(tǒng)設(shè)計

1、約束系統(tǒng)設(shè)計約束系統(tǒng)設(shè)計l法規(guī)將不斷更新法規(guī)將不斷更新, 變嚴變嚴, 與國際接軌與國際接軌lCNCAP出臺出臺, 消費者對消費者對”幾顆星幾顆星”關(guān)注日增關(guān)注日增l對歐美的出口計劃對歐美的出口計劃l安全任證由安全任證由”送檢送檢”變變”抽檢抽檢”l如何在保持價格優(yōu)勢的前提下如何在保持價格優(yōu)勢的前提下, 面對以上的面對以上的挑戰(zhàn)挑戰(zhàn)?拋磚引玉拋磚引玉, 提出來交流提出來交流l建立完整的約束系統(tǒng)團隊建立完整的約束系統(tǒng)團隊(CAE, Development, D/R, testing)l整車概念設(shè)計階段整車概念設(shè)計階段, 安全團隊要介入安全團隊要介入, 提提出空間參數(shù)要求出空間參數(shù)要求.l檢討約束系

2、統(tǒng)設(shè)計規(guī)范檢討約束系統(tǒng)設(shè)計規(guī)范l檢討對供應(yīng)商的質(zhì)量標(biāo)準(zhǔn)檢討對供應(yīng)商的質(zhì)量標(biāo)準(zhǔn)Interior TrimSensorsRCM ModuleDriver AirbagPass AirbagBelt SystemSide AirbagCurtain BagAccelerationRoll rateSeat TrackWeight Belt BucklePositionPretensioner Load LimiterDecide: 1. Fire or Not2. What time to Fire Knee BolsterSeatsSteering ColumnWindshieldWindshie

3、ldGas PedalFloor PanBag doorDoor SeamBagInflatorLogoAcura MDX7.6DiscreteHardTopChevy Aveo8.0DiscreteHardMidHyundai Sonata-SeamlessSoftFront% of All Vehicles Hyundai Sonata-SeamlessSoftFrontLexus LX-SeamlessSoftFront % Of All VehiclesDriver Side Bag/ InflatorTank PressureTimeTwo StagesSingle StagePas

4、senger Side Bag/ InflatorMass FlowTime1+2 Stage (High Output)1st Stage (Low Output)2nd StageThorax BagPelvis BagThorax Side AirbagIC Airbag (Inflatable Curtain)-Provides interior head protection for front/rear occupant-Prevents occupant ejectionSeat Track Safety Concernl/2l/25% FEMALE50% MALEL/2L/2H

5、/2H/2Seat frameSeat frame is designed to prevent submarining of smaller occupants.BladderPush PinsBackerboardFelt PadPressure SensorECUSeat Weight Occupant SensingSeat frame in Frontal CrashRecliners in a seat are more than just a comfort device. They are designed to withstand high forces, such as t

6、he loads that can be caused in frontal crash.Seat frame in Rear CrashExcessive stiffness of seat frame is also not desirable for the front occupant in a rear impact which may cause neck injury.nRetractornAnchornHeight AdjusternD-ringnWebbingnTonguenBucklelThe purpose of a pretensioner is to remove s

7、lack for the belt system early in an event.lMost pretensioners use a pyrotechnic (explosive) to provide the energy of operationlThere are Buckle and Retractor pretensioners. Seat Belt: Retractor PretensionerslThere are two main methods of retractor pretensioning: Move the retractor linearly with the

8、 spool locked Rewind the seat belt Retractor pretensioners pull on the shoulder part of the belt. Seat Belt: Buckle PretensionerslBuckle pretensioners utilize a pyrotechnic charge to pull the buckle down linearly increasing the tension in the lap and shoulder beltlThe buckle is usually attached to a

9、 cable that runs into the pretensioner body and tube.lBuckle Pretensioners pull on both the lap and shoulder parts of the seat beltSeat Belt: Load LimiterlReduces peak occupant loading during a crash by allowing controlled payout after retractor lockuplIt is integrated into the retractor lIn a crash

10、 situation: the retractor will lock under high load, the torsion bar will twist, which absorbs energy and limits the peak loadLoadPaid OutDigressive ForceConstant ForceKnee Bolster and Cross Car BeamnCompartment stabilizationnAdditional steering column supportKnee bag is very effective for unbelted

11、mode in reducing dummy riding downCollapsible PR Steering Column4” CollapseInt ShaftBend StrapShear TabExternal Stroking Column2” MovementF1F2F3 = F1 + F2Concept:Bookshelf Bending SheetAnd Pyrotechnic Switch“ Combination Allow for theHigh (F3) / Low (F1)e-Absorption CapabilityFundamentals:lSimple &a

12、mp; RobustlPredicatable & RepeatablePedestrian Protection BagsCrash Sensor SystemsElectronic Multi-Point System Advanced Restraints System (ARS) Restraints Control Module (RCM) Side Crash Sensor (SCS) Front Crash Sensor (FCS) Rollover Sensor Deployable Devices Driver / Passenger Front Airbags 1s

13、t Stage Driver / Passenger Front Airbags 2nd Stage Driver / Passenger Pretensioners Driver / Passenger Safety CanopyRCMFCSSCSSCSSCSSCSCrash Analysis: Sensor PackagingRCM Center tunnel between seatsSCS B-pillar at rocker C-pillar at rockerFCS Lower radiator support Above bumper beamSensor Process: Fl

14、ow DiagramSensor Map*Crash SensorsTest Authorization*Build Site Sign-offCrash TestData RetrievalData ProcessingDeployment Targets*Crash Reports*Calibration Review* Additional InformationSensor Process: Test AuthorizationSensor Types Triax - Accelerometers Angular Rate Sensor Sensor Location Camera p

15、ositions Exterior Interior Film AVI format Digitized film Special RequestsSensor Process: Deployment TargetsCAE and MADYMO analysis are used in conjunction with sled tests to determine if and when an airbag is needed based on occupant injury numbersFront Deployment Targets Driven by the occupants mo

16、vement towards the steering wheel or instrument panel The 5”- 30 ms calculation is a used to estimate the front airbag deployment time from crash dataSide Deployment Targets Driven by the gap closure Gap closure between the seat and b-pillar (Combo SAB, Thorax SAB) Gap closure between the occupant a

17、nd impacted object (Air Curtain, Safety Canopy) There is no general “rule-of-thumb” calculation for side airbag deployment timesRollover Deployment Targets Driven by the gap closure between the occupant and impacted objectSensor Process: Deployment Targets5”- 30 ms AnalysisThe goal of the 5”-30 ms c

18、alculation is to estimate a front airbag deployment time such that the airbag is fully inflated when the occupant strikes it. That way, the airbag does not add energy to the occupants movement, but instead dissipates the occupants energy.Assumptions The occupant is an unbelted 50th percentile male s

19、itting upright in mid seat position The airbag inflation time is 30 ms The occupants head behaves as a free mass with respect to the rest of the vehicle The approximate distance between the occupant and the fully inflated airbag is 5 inchesMethods Averaged left/right rocker data Film analysisSensor Process: Deployment Targets5”- 30 ms AnalysisDouble integrate the acceleration from the left and right b-pillar rocker positions and average them to estimate the displacement of the occupants head.5” - 30 ms = (time to displace occupants head 5”) - (airbag inflation time)Displacement-6-5-4-3-