Tactile Occupant Detection Sensor for Automotive Airbag

• Published in: Energies (Basel) 2021-09, Vol.14 (17), p.5288
• Main Authors: Shirur, Naveen, Birkner, Christian, Henze, Roman, Deserno, Thomas M.
• Format: Article
• Language: English
• Subjects: Air bags; automotive airbag; Cameras; capacitive tactile sensor; Control systems; Cushions; Electrodes; Energy absorption; Injuries; occupant detection; Optimization techniques; passive safety; Position sensing; Sensors; Tactile sensors (robotics); vehicle crash; Vision systems
• ISSN: 1996-1073; 1996-1073
• DOI: 10.3390/en14175288

Automotive airbags protect occupants from crash forces during severe vehicle collisions. They absorb energy and restrain the occupants by providing a soft cushion effect known as the restraint effect. Modern airbags offer partial restraint effect control by controlling the bag’s vent holes and providing multi-stage deployment. Full restraint effect control is still a challenge because the closed-loop restraint control system needs airbag–occupant contact and interaction feedback. In this work, we have developed novel single and matrix capacitive tactile sensors to measure the occupant’s contact data. They can be integrated with the airbag surface and folded to follow the dynamic airbag shape during the deployment. The sensors are tested under a low-velocity pendulum impact and benchmarked with high-speed test videos. The results reveal that the single sensor can successfully measure occupant–airbag contact time and estimate the area, while the contact position is additionally identified from the matrix sensor.