GTR Head restraints Dynamic test procedure

1. GTR Head restraintsDynamic test procedure Trigger-point in dynamic test procedure

2. GTR Head RestraintsDynamic test procedure – trigger point FMVSS 202a provides a dynamic test procedure as compliance option for front outboard designated seating positions • full vehicle sled test (without wheels, fluids) • synthetic sinusoidal pulse peak acceleration: 86 m/s² (corridor defined) max velocity (delta v): 17, 3 km/h ± 0,6 km/h • 50th-percentile male Hybrid III test dummy (49 CFR § 572, Subpart E) • angular rotation between head and torso  12° • HIC15 500

3. GTR Head RestraintsDynamic test procedure – trigger point

4. GTR Head RestraintsDynamic test procedure – trigger point Active head restraint system • reducing of backset in case of rear end collision by moving head restraints front surface; • energy store (e.g. preloaded spring, pyrotechnic actuator); • Activation by control unit (e.g. airbag-control-unit) • Activation dependant on algorithm which is implemented in control unit and is based on various sensor signals received in real world crash;

5. GTR Head RestraintsDynamic test procedure – trigger point Comparison of vehicle accelerations in test procedures concerning rear end collisions • FMVSS 202a dynamic test; • barrier test (with equivalent velocity change)

6. GTR Head RestraintsDynamic test procedure – trigger point Barrier test for rear end collisionDynamic test with movable barrier to test for vehicle in rear end collisions. The barrier test shall cause a correspondingvelocity change(energy)to the FMVSS 202a dynamic test; The impact speed of the barrier is vehicle specific • movable barrier (longitudinal direction) impacts vehicle at standstill from rear; • barrier weight 1400 kg; • 10° angle of barrier to vehicle longitudinal axis; • 40% offset; • approx. 35 km/h barrier impact speed (dependant on mass of struck vehicle);

7. GTR Head RestraintsDynamic test procedure – trigger point Comparison of sensed vehicle accelerations Acceleration [ m/s² ] barrier test FMVSS 202a Time [ s ] Acceleration sensor signal at vehicle body (B-pillar position)

8. GTR Head RestraintsDynamic test procedure – trigger point Deployment of active head restraint The deployment algorithm of an active head restraint is contained in the control unit. (e.g. airbag control unit) The deployment algorithm evaluates various sensor signals (e.g. linear acceleration; rotational acceleration, deformation) • The software and data in the control units contain: • plausibility checks of sensor signals; • discrimination routines for crash severity;

9. GTR Head RestraintsDynamic test procedure – trigger point The active head restraint maynot deploy if vehicle is subjected to a dynamic test according to FMVSS 202a. The active head restraint will deploy if vehicle is subjected to a rear end collision with a velocity change of the vehicle of 17, 3 km/h.

10. GTR Head RestraintsDynamic test procedure – trigger point Proposal for active head restraints in dynamic test procedure • Dynamic test procedure according to FMVSS 202a with battery installed and ignition “ON”; (Airbag system operable) • Usage of trigger point for active head restraints in dynamic test procedure according to FMVSS 202a on request of the vehicle manufacturer; • Vehicle specific trigger point according to manufacturer’s information; • Manufacturer must provide data of a standardized barrier test (rear end collision) with energy level (delta v  17,3 km/h) of FMVSS 202a pulse;

11. GTR Head RestraintsDynamic test procedure – trigger point • End of presentation • Thank you for your attention