Recently, in addition to conventional passive safety systems, active safety systems play an important role in the vehicle’s overall safety performance. Autonomous Emergency Braking (hereinafter, AEB) system is one of the main devices among the active safety systems as it can mitigate or avoid collision events of vehicles.
In previous researches, occupant’s forward behavior was observed during the pre-crash phase of the vehicle when AEB is activated. It is obvious that the behavior is not intended and can affect the injury value of the occupant. In several studies, it was reported that the neck injury value of the occupant is increased although the vehicle’s impact
speed decreased. In the Present study, as a preliminary step for the “Integrated Safety”, a driver-side airbag is newly developed considering driver’s forward behavior induced by autonomous emergency braking system.
First, driver’s forward displacement during the autonomous emergency braking condition is measured based on Euro-NCAP AEB test scenarios in order to establish the database for bag-shape design. It was shown that the forward displacement of the H-III female dummy is approximately 1.3 times larger compared to H-III male dummy. The maximum displacement of the H-III female dummy was 162 mm.
Second, a driver-side airbag is designed to mitigate the neck injury induced by the forward motion of the driver’s head. The concept of the airbag is to limit the x-directional deployment length in the primary stage (~15ms) by adopting three panels.
Third, the performance evaluation of the developed driver-side airbag is performed by a series of crash simulations and SLED tests. In the simulations and the tests, the driver’s forward behavior was considered in order to reflect the AEB activated condition. In the present study, it is assumed that the vehicle’s speed reduces from 64 to 40 kph by the AEB activation. The injury value of the 64 kph sled test (without forward motion) and the 40 kph sled test (with forward motion) are compared with each other. As a result, it is shown that the developed driver-side airbag decreases both HIC and Nij values compared to conventional driver-side airbag when AEB is activated. The neck tension and moment values are decreased 26 and 45%, respectively when developed driver-side airbag is used.
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