Vehicle safety restraint system with linear output impact...

G - Physics – 01 – P

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G01P 15/105 (2006.01) B60R 21/01 (2006.01) H01H 35/14 (2006.01)

Patent

CA 2173648

A vehicle restraint system that includes an impact sensor for sensing a vehicle impact to provide an electrical impact signal, an occupant restraint such as an air bag to restrain motion of a vehicle occupant, and an electronic control circuit responsive to the impact signal for operating the occupant restraint. The impact sensor includes a permanent magnet axially slidable within a linear cavity and resiliently biased to one end of the cavity, such that vehicle impact forces on the sensor urge the magnet to slide axially toward the opposing end of the cavity against the biasing forces. A magnetic sensor is disposed adjacent to the cavity and is characterized by providing the electrical impact signal as an analog electrical signal that varies in magnitude as a continuous monotonic function of axial position of the magnet within the cavity. The electronic control circuit is responsive to the impact signal for analyzing magnitude, slope and duration of the impact signal in order to predict necessity for activating the restraint system, and activating the restraint system when the magnitude slope and duration of the impact signal meet predetermined signal conditions or criteria.

Cette invention concerne un système de retenue de sécurité pour véhicule automobile qui comprend un capteur d'impact destinée à émettre le cas échéant un signal électrique d'impact, un dispositif de retenue tel qu'un coussin gonflable et un circuit électronique de commande réagissant au signal d'impact pour déployer le dispositif de retenue. Le capteur d'impact comprend un aimant permanent adapté pour coulisser à l'intérieur d'une enceinte linéaire et repoussé par une force élastique contre une extrémité de l'enceinte dont il sera éloigné vers l'extrémité opposée par les forces d'impact. Un capteur magnétique disposé à proximité de l'enceinte sert à générer un signal électrique analogique d'impact dont l'intensité varie de façon monotone linéaire en fonction de la position axiale de l'aimant à l'intérieur de l'enceinte. Le circuit électronique analyse le signal d'impact pour en déterminer l'intensité, la pente et la durée afin de prévoir la nécessité d'activer le dispositif de retenue et pour activer effectivement ledit dispositif lorsque les paramètres ci-dessus atteignent des valeurs de consigne prédéterminés.

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