G - Physics – 01 – P
Patent
G - Physics
01
P
G01P 3/481 (2006.01)
Patent
CA 2746252
A device for measuring the speed of movement of a wheeled terrestrial vehicle is characterized in that it comprises a magnetometer (2) intended to take measurements of a magnetic field and positioned so as to be sensitive to the magnetic field variations caused by the rotation of at least one at least partially metallic wheel, as such, of the vehicle and capable of delivering a corresponding signal (20), and means (3) for processing said signal that are capable of establishing a frequency spectrum thereof, of determining, from said frequency spectrum, a frequency of rotation of said wheel and of deducing therefrom, on the basis of information representative of the radius of the wheel, the speed of movement of the vehicle. Application in particular to tachometers for motor vehicles.
Un dispositif de mesure de la vitesse de déplacement d'un véhicule terrestre à roues est caractérisé en ce qu'il comprend un magnétomètre (2) destiné à effectuer des mesures d'un champ magnétique et positionné de manière à être sensible aux variations de champ magnétique engendrées par la rotation d'au moins une roue au moins partiellement métallique du véhicule, telle quelle, et apte à délivrer un signal (20) correspondant, et des moyens de traitement (3) dudit signal aptes à établir un spectre de fréquences de celui-ci, à déterminer, à partir dudit spectre de fréquences, une fréquence de rotation de ladite roue, et à en déduire, à partir d'une information représentative du rayon de la roue, la vitesse de déplacement du véhicule. Application notamment aux tachymètres pour véhicules automobiles.
Smart & Biggar
Sysnav
LandOfFree
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