Device to detect seat belt buckle status

Details Device to detect seat belt buckle status Device to detect seat belt buckle status

B - Operations, Transporting

60

R

B60R 22/48 (2006.01) A44B 11/26 (2006.01) G01D 5/16 (2006.01)

Patent

CA 2324508

A seat belt buckle and latch indicating system employs a seat belt buckle (20) with a Giant Magnetoresistive (GMR) sensor (46) spaced from a magnet (50) above a gap through which a ferromagnetic latch (26) protrudes. The latch may reside at three distinct positions: unlatched, latched, and latched without the presence of a hasp. The latch functions as a magnetic field concentrator with the result that the sensed magnetic field is dependent on latch position. The GMR sensor provides a signal indicating the sensor is working at all times, and provides specific information based on physical positioning of the critical components of the belt and which indicates that the buckle is mated to the seat belt hasp (38).

Cette invention se rapporte à un système indiquant la position de la boucle et de la clavette d'une ceinture de sécurité, ce système utilisant une boucle de ceinture de sécurité (20) pourvue d'un capteur magnétorésistif géant (GMR) (46) placé à distance d'un aimant (50) au-dessus d'un entrefer à travers lequel passe une clavette ferromagnétique (26). Cette clavette peut se trouver dans trois positons distinctes: non verrouillée, verrouillée et verrouillée sans la présence d'un moraillon. La clavette sert de concentrateur du champ magnétique, de telle sorte que le champ magnétique détecté dépend de la position de la clavette. Le capteur GMR fournit un signal indiquant que le capteur travaille en tout temps et il fournit des informations spécifiques sur la base de la position physique des éléments critiques de la ceinture et indiquant que la boucle est couplée au moraillon (38) de la ceinture de sécurité.

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