约束系统设计.

1、 l法规将不断更新法规将不断更新, 变严变严, 与国际接轨与国际接轨 lCNCAP出台出台, 消费者对消费者对”几颗星几颗星”关注日增关注日增 l对欧美的出口计划对欧美的出口计划 l安全任证由安全任证由”送检送检”变变”抽检抽检” l如何在保持价格优势的前提下如何在保持价格优势的前提下, 面对以上的面对以上的 挑战挑战? 抛砖引玉抛砖引玉, 提出来交流提出来交流 l建立完整的约束系统团队建立完整的约束系统团队(CAE, Development, D/R, testing) l整车概念设计阶段整车概念设计阶段, 安全团队要介入安全团队要介入, 提提 出空间参数要求出空间参数要求. l检讨约束系统

2、设计规范检讨约束系统设计规范 l检讨对供应商的质量标准检讨对供应商的质量标准 Interior Trim Sensors RCM Module Driver Airbag Pass Airbag Belt System Side Airbag Curtain Bag AccelerationRoll rateSeat Track Weight Belt BucklePosition Pretensioner Load Limiter Decide: 1. Fire or Not 2. What time to Fire Knee Bolster Seats Steering Column Wi

3、ndshield Windshield Gas PedalFloor Pan Bag door Door Seam Bag Inflator Logo Acura MDX 7.6 DiscreteHard Top Chevy Aveo 8.0 DiscreteHard Mid Hyundai Sonata - SeamlessSoft Front % of All Vehicles Hyundai Sonata - SeamlessSoft Front Lexus LX - SeamlessSoft Front % Of All Vehicles Driver Side Bag/ Inflat

4、or Tank Pressure Time Two Stages Single Stage Passenger Side Bag/ Inflator Mass Flow Time 1+2 Stage (High Output) 1st Stage (Low Output) 2nd Stage Thorax Bag Pelvis Bag Thorax Side Airbag -Provides interior head protection for front/rear occupant -Prevents occupant ejection l/2 l/2 5% FEMALE 50% MAL

5、E L/2L/2 H/2 H/2 Seat frame is designed to prevent submarining of smaller occupants. Bladder Push Pins Backerboard Felt Pad Pressure Sensor ECU Seat Weight Occupant Sensing Recliners in a seat are more than just a comfort device. They are designed to withstand high forces, such as the loads that can

6、 be caused in frontal crash. Excessive stiffness of seat frame is also not desirable for the front occupant in a rear impact which may cause neck injury. nRetractor nAnchor nHeight Adjuster nD-ring nWebbing nTongue nBuckle lThe purpose of a pretensioner is to remove slack for the belt system early i

7、n an event. lMost pretensioners use a pyrotechnic (explosive) to provide the energy of operation lThere are Buckle and Retractor pretensioners. lThere are two main methods of retractor pretensioning: Move the retractor linearly with the spool locked Rewind the seat belt Retractor pretensioners pull

8、on the shoulder part of the belt. lBuckle pretensioners utilize a pyrotechnic charge to pull the buckle down linearly increasing the tension in the lap and shoulder belt lThe buckle is usually attached to a cable that runs into the pretensioner body and tube. lBuckle Pretensioners pull on both the l

9、ap and shoulder parts of the seat belt lReduces peak occupant loading during a crash by allowing controlled payout after retractor lockup lIt is integrated into the retractor lIn a crash situation: the retractor will lock under high load, the torsion bar will twist, which absorbs energy and limits t

10、he peak load Load Paid Out Digressive Force Constant Force nCompartment stabilization nAdditional steering column support Knee bag is very effective for unbelted mode in reducing dummy riding down 4” Collapse Int Shaft Bend Strap Shear Tab External Stroking Column 2” Movement F1 F2 F3 = F1 + F2 Conc

11、ept: Bookshelf Bending Sheet And Pyrotechnic Switch“ Combination Allow for the High (F3) / Low (F1) e-Absorption Capability Fundamentals: lSimple & Robust lPredicatable & Repeatable Electronic Multi-Point System Advanced Restraints System (ARS) Restraints Control Module (RCM) Side Crash Sensor (SCS)

12、 Front Crash Sensor (FCS) Rollover Sensor Deployable Devices Driver / Passenger Front Airbags 1st Stage Driver / Passenger Front Airbags 2nd Stage Driver / Passenger Pretensioners Driver / Passenger Safety Canopy RCM FCS SCSSCS SCSSCS RCM Center tunnel between seats SCS B-pillar at rocker C-pillar a

13、t rocker FCS Lower radiator support Above bumper beam Sensor Map* Crash Sensors Test Authorization* Build Site Sign-off Crash Test Data Retrieval Data Processing Deployment Targets* Crash Reports* Calibration Review * Additional Information Sensor Types Triax - Accelerometers Angular Rate Sensor Sen

14、sor Location Camera positions Exterior Interior Film AVI format Digitized film Special Requests CAE and MADYMO analysis are used in conjunction with sled tests to determine if and when an airbag is needed based on occupant injury numbers Front Deployment Targets Driven by the occupants movement towa

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

16、d object (Air Curtain, Safety Canopy) There is no general “rule-of-thumb” calculation for side airbag deployment times Rollover Deployment Targets Driven by the gap closure between the occupant and impacted object 5”- 30 ms Analysis The goal of the 5”-30 ms calculation is to estimate a front airbag

17、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 sitting upright in mid seat position The

18、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 inches Methods Averaged left/right rocker data Film analysis 5”- 30 ms Analysis Double 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 in