Method of operating tyre pressure signalling devices on...

B - Operations – Transporting – 60 – C

Patent

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B60C 23/04 (2006.01)

Patent

CA 2240397

The disclosure relates to a method of operating tyre pressure signalling devices on wheels fitted with pneumatic tyres, i.e. signalling the air pressure inside air tyres. A pressure sensor measures the tyre pressure at regular intervals, an evaluation circuit compares the measured tyre pressure values with a reference value and in the event of discrepancies between the measured tyre pressures and the reference value in excess of a threshold value .DELTA.p transmits a signal indicating the discrepancy to a display device remote from the wheel, the device covering its own power requirements from an electrical battery. As long as the pressure measured by the pressure sensor remains below a predetermined second pressure threshold, specifically a preselected absolute pressure value, no signal is transmitted.

L'invention concerne un procédé pour faire fonctionner des dispositifs montés sur des roues pourvues de pneumatiques pour indiquer la pression des pneumatiques, c'est-à-dire la pression de gonflage des pneus. Un capteur de pression mesure la pression des pneus à intervalles réguliers. Un circuit d'évaluation compare les valeurs mesurées à une pression théorique. Si la valeur mesurée dépasse la pression théorique, d'une valeur seuil .DELTA.p, un signal communiquant l'écart en question est transmis par radio à un afficheur disposé à distance de la roue. Le dispositif couvre son besoin en énergie par une pile électrique. Le mode radio est en service tant que la pression mesurée par le capteur de pression reste en deça d'un second seuil de pression sélectionné, notamment une valeur absolue de pression présélectionnée.

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