Inflator capable of modulating airbag inflation rate in a...

B - Operations – Transporting – 60 – R

Patent

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Details

B60R 21/26 (2006.01) B60R 21/28 (1995.01)

Patent

CA 2279410

In an occupant restraint apparatus for installation in a vehicle, a smart airbag inflator (14) is provided with a piston (30) for regeneratively pumping liquid propellant from a reservoir (49) into a combustion chamber (48) for ignition and combustion to generate airbag inflation gases. To control the airbag inflation rate, the piston includes a piston head (32) slidingly received in a damping chamber (46) filled with a magneto-rheological fluid (83) that is pumped through an orifice (92) during the regenerative pumping stroke of the piston. An electromagnet (86) is selectively energized to produce a varying magnetic field to adjust the viscosity of the magneto-rheological fluid flowing through the orifice and thus vary a damping force exerted on the piston stroke, thereby modulating the rate of liquid propellant combustion. Electromagnet current excitation is controlled in response to a particular accident scenario.

L'invention est destinée à un appareil de retenue des occupants d'un véhicule et concerne un dispositif de gonflage intelligent (14) de coussin muni d'un piston (30) qui sert à pomper par récupération un agent propulseur depuis un réservoir (49) dans une chambre de combustion (48) dans laquelle se produit l'allumage et la combustion générant les gaz de gonflage du coussin. Afin de commander le degré de gonflage du coussin, le piston est pourvu d'une tête (32) qui rentre coulissante dans une chambre d'amortissement (46) remplie d'un fluide magnéto-rhéologique (83), qui est pompé à travers un orifice (92) durant la course de pompage de récupération du piston. On excite de manière sélective un électro-aimant (86) pour produire un champ magnétique variable afin de régler la viscosité du fluide magnéto-rhéologique s'écoulant à travers l'orifice et ainsi de faire varier la force d'amortissement exercée sur la course du piston, ce qui modifie le taux de combustion de l'agent propulseur. On commande l'excitation de l'électro-aimant par le courant en réaction à un type particulier d'accident.

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