The BMW SBE2 Child Seat Detection System

  • L. Eisenmann
  • C. Marschner
  • Y. Lu
  • S. Sauer
  • H. Howard
Conference paper
Part of the VDI-Buch book series (VDI-BUCH)


Besides a measure of crash-severity the smart airbag system of the future needs information about the actual seat-occupation. For the driver seat, two parameters are to be evaluated:
  • Approximate weight of driver (occupant classification)

  • Drivers distance to airbag (out of position sensor)

For the passenger seat, two additional aspects are relevant:
  • Is the seat occupied at all? (seat occupation detection)

  • Is it occupied by a child seat? (child seat detection)

Child seat detection is especially important in two-seat vehicles like the Z3 roadster. This challenge is adressed by the upcoming BMW SBE2 system. Unlike some competitors strategies to install manual airbag deactivation switches or to develop a system that recognises only certain child seats equipped with electronic resonators, the BMW SBE2 system generally discriminates between adults and child restraints.

The sensor-principle is based on the measurement of two distinct physical properties, pressure profile and capacity. The employment of digital signal processing and pattern recognition algorithms enables a redundant, selfsupervising and fully-automatic detection system.


child seat detection system capacitive-system occupant classification field detection system electric field smart airbag 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • L. Eisenmann
    • 1
  • C. Marschner
    • 2
  • Y. Lu
    • 3
  • S. Sauer
    • 4
  • H. Howard
    • 5
  1. 1.BMW AGPasenbachGermany
  2. 2.BMW AGMünchenGermany
  3. 3.BMW AGFreisingGermany
  4. 4.BMW AGMünchenGermany
  5. 5.BMW AGLeamington SpaUK

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