Situation Appropriate Airbag Deployment: Child Seat Presence and Orientation Detection (CPOD)

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Abstract

In the last years, the auto industry has grown increasingly aware of the potential dangers of passenger airbag deployments, especially for children placed in a child seat. As a solution to this problem, IEE has developped the CPOD system, based on its already hugely successful Passenger Presence Detection (PPD) sensor foil.

IEE’s CPOD system is divided into two components: the transmitting and receiving antenna loops, integrated in the passenger seat, and a resonator circuit fitted in the socket of the child seat. The need for extremely low radiation and a cost-effective system has led to a very basic antenna structure, which consists of single-loop coils printed on the existing PPD sensor mat. Weak electromagnetic fields (emitted by the transmitting antenna) are used to establish a communication between the resonators and the processing electronics as well as to supply energy to the low-power resonator circuitry. Using both the information encoded in the received signals and their intensity, the processing electronics are able to take a decision on the presence, orientation and type of a child seat. Thanks to the redundancy and the multiple modulation of the transmitted information, the necessary reliability and interference immunity for a system which controls airbag deployment behaviour is obtained.

Future developments will integrate an Occupant Classification into IEE’s sensor foil to offer even more parameters to modulate airbag deployment.