Multiple sensor vehicle occupant detection for air bag...

B - Operations – Transporting – 60 – R

Patent

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Details

B60R 21/015 (2006.01) B60N 2/44 (2006.01)

Patent

CA 2531886

A passenger detection system is provided. The passenger detection system utilizes an oscillation circuit that causes an antenna electrode to emit an electric field that is disrupted by the electrical characteristics of an object placed on the seat. This disruption alters the current and phase of the signal in the antenna electrode. By comparing the current flowing in the antenna electrode and/or the difference between the phase of the signal in the antenna electrode and the oscillation circuit output signal with predetermined threshold values, it is possible to detect the presence of a passenger in a reliable and inexpensive manner. Environmental sensors are used to make the determination more accurate. Humidity, moisture and/or grounding condition are detected and used to alter processing, values or calculations.

Cette invention concerne un système de détection de passagers. Le système de détection de passagers utilise un circuit oscillant entraînant une électrode d'antenne pour qu'elle émette un champ électrique qui est perturbé par les caractéristiques électriques d'un objet placé sur le siège. Cette perturbation modifie le courant et la phase du signal de l'électrode d'antenne. En comparant le courant qui traverse l'électrode d'antenne et la différence entre la phase du signal dans l'électrode d'antenne et le signal de sortie du circuit oscillant à des valeurs limites prédéterminées, il est possible de détecter la présence d'un passager de façon fiable et bon marché. Des capteurs environnementaux sont utilisés pour que la détermination soit plus précise. L'humidité et les conditions de terre sont détectées et utilisées pour modifier le traitement, les valeurs ou les calculs.

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