Land vehicles – Wheeled – Attachment
Patent
1998-12-02
1999-12-07
Rice, Kenneth R.
Land vehicles
Wheeled
Attachment
180268, 180274, B60R 2132
Patent
active
RE0364274
ABSTRACT:
A system and method for controlling actuation of a vehicle safety device in response to an impact to a first portion of the vehicle includes a ferromagnetic element mechanically coupled with the first portion of the vehicle so as to receive elastic strain waves generated as a result of plastic deformation of the first portion of the vehicle. A permanent magnet is mounted on the vehicle adjacent to the ferromagnetic element so that the ferromagnetic element itself influences the magnetic field. An induction coil is also mounted on the vehicle so as to fall within the magnetic field generated by the magnet. Upon plastic deformation of the first portion of the vehicle, the ensuing elastic strain waves elastically deform the ferromagnetic element to vary its ferromagnetic properties and, in turn, alter the magnetic field so as to induce an electromotive force voltage in the induction coil. A signal processor receives the electromotive force voltage induced in the induction coil by the varying magnetic field. The signal processor actuates the safety device when the electromotive force voltage, or an appropriate measure derived from the electromotive force voltage, exceeds a predetermined threshold.
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Breed Automotive Technology Inc.
Rice Kenneth R.
Seitzman Markell
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