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A primary study on the restraint system of self-driving car
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 14, 2020 by SAE International in United States
Due to the variation of compartment design and occupant’s postures in the self-driving car, there is a new and major challenge for occupant protection. In particular, the studies on occupant restraint systems used in the self-driving car has significantly delayed compared to the development of the autonomous technologies. In this paper, a numerical study was conducted to investigate the protective effects of the mainstream restraint systems (3-points belt with airbag or 4-points belt with airbag) on the driver in three different scenarios (driving with a seat angle of 110°, half-reclining resting with a seat angle of 135°, and reclining resting with a seat angle of 160°) . It can be found that in the simulation results: 1. All the restraint systems are capable of providing effective protection for the driving driver and the restraint system with 4-points belt has advantages due to its better protective effect on the occupant thorax; 2. When the driver is half-reclining or reclining resting, the head HIC36, neck Nij and chest compression are about 827-958, 0.62-0.88, and 66-68 mm, respectively; These values are higher than those of a driving driver by 60%-85% for HIC36, 113%-203% for neck Nij , and 65%-66% for chest compression, respectively. 3. There are obvious occupant who dives in the half-reclining and reclining resting scenarios. This study shows that the mainstream restraint system cannot meet the safety requirements for occupants with multi-postures in the self-driving car and the smart restraint system which can be actively adjusted for occupant’s posture when necessary.