Device for measuring the rotary frequency of a rotating...

B - Operations – Transporting – 60 – C

Patent

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Details

B60C 19/00 (2006.01) G01M 17/013 (2006.01) G01M 17/02 (2006.01) G01P 3/36 (2006.01) G01P 3/44 (2006.01) G01P 3/481 (2006.01)

Patent

CA 2209645

A device for measuring a rotary frequency of a rotating vehicle tire includes a number of first poles uniformly arranged on a circle with a radius R1 on or within a vehicle tire. A first sensor, for sensing the first poles, is stationarily arranged at a distance R2 from a rotational axis of the vehicle wheel. The radii have the following relationship: 0.9 R1 < R2 < 1.1R1. A computing unit is connected to the first sensor. The first sensor sends first signals to the computing unit when the first poles pass the first sensor. The computing unit determines a first time period between passing of sequential ones of the first poles. The computing unit multiplies a reciprocal value of the first time period by a reciprocal value of the number of the first poles to a multiplication product and supplies the multiplication product as a measure of a first rotary frequency to a user device.

Dispositif pour mesurer la fréquence de rotation d'un pneu de véhicule en mouvement comprenant plusieurs premières tiges placées régulièrement sur un cercle de rayon R1 sur un pneu de véhicule ou à l'intérieur de ce dernier. Un premier capteur servant à détecter les premières tiges est fixé à demeure à une distance R2 d'un axe rotationnel de la roue du véhicule. Les rayons ont la relation suivante : 0.9 R1 < R2 < 1.1R1. Une unité de calcul est raccordée au premier capteur, lequel transmet les premiers signaux à l'unité de calcul lorsque les premières tiges passent devant le premier capteurr. L'unité de calcul détermine une première période de temps entre les passages successifs des premières tiges. L'unité de calcul multiplie la valeur inverse de la première période de temps par la valeur inverse du nombre de premières tiges et fournit le produit de multiplication ainsi obtenu comme la mesure d'une première fréquence de rotation à un dispositif de lecture.

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