Comparison of OICA and Korea Synchronisation Processes

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Presentation transcript:

Comparison of OICA and Korea Synchronisation Processes IWG-DPPS Comparison of OICA and Korea Synchronisation Processes for Dynamic Testing Martin Harvey, September 2018

Background For deployable systems that do not have a permanently deployed position or TRT>HIT, dynamic testing is required ensuring synchronisation of the head form launch device and system deployment to achieve the correct head impact time. The following slides compare the OICA and Korea processes which are used to calculate the synchronisation delay for establishing the correct fire time of the deployable system.

OICA Synchronisation Process (HIT > TRT) Launch to head contact (190ms) Synchronisation delay (190-76 = 114ms) Time after sensing to HIT (91-15 = 76ms) T0 T2 T1 ST (15ms) Deployment Time (60ms) TRT Pedestrian to Vehicle Event Lab Test HIT (91ms) Korea Synchronisation Process Case 1 (HIT > TRT) a = 75 - 91 = -16 Synchronisation delay = 190 – (60 - -16) = 190 – 76 = 114 ms

JLR (OICA) Synchronisation Process (HIT < TRT) Pedestrian to Vehicle Event ST (15ms) Deployment Time (60ms) TRT HIT (50ms) T0 T2 T2 Lab Test Launch to head contact (190ms) Synchronisation delay (190-35 = 155ms) TAS to HIT (50-15 = 35ms) T1 Korea Synchronisation Process Case 1 (HIT < TRT) a = 75 - 50 = 25 Synchronisation delay = 190 – (60 - 25) = 190 – 35 = 155 ms

Korea Synchronisation Process Case 2 JLR (OICA) Synchronisation Process (HIT > TRT) when launch to contact time less than TRT Pedestrian to Vehicle Event Pedestrian to Vehicle Event ST (15ms) Deployment Time (60ms) HIT (91ms) TRT T Lab Test Launch to head contact (65ms) Fire signal to deployable device 11ms before rig launch (65-76) Time after sensing to HIT (91-15 = 76ms) Korea Synchronisation Process Case 2 a = 75 - 91 = -16 Synchronisation delay = 60 – (65 + -16) = 60 – 49 = 11ms

Conclusion OICA and Korea synchronisation processes result in identical synchronisation delay times. As the OICA process only uses sensor time in the calculations and not TRT, this method is more suitable for pedestrian airbags where it is difficult to measure TRT.