Programming signal source and calibration data for a...

G - Physics – 01 – P

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354/15, 73/0.5

G01P 21/02 (2006.01)

Patent

CA 2005700

A speedometer/tachometer assembly for an automotive vehicle, such as a heavy truck, has a ten section DIP switch for calibrating the speedometer and a like switch for calibrating the tachometer. When set to all "0's", each switch causes the corresponding meter to be driven by a variable frequency signal from a corresponding sensor, as calibrated by a corresponding calibration factor that has been preloaded in the non-volatile memory of a microprocessor that operates the meters. When set to all "l's", each switch causes the corresponding meter to be operated from pre-calibrated data appearing on a data link. When set to any other setting, the setting determines the calibration factor that is applied to the uncalibrated signal, and this is used to drive the corresponding meter.

Cette invention concerne un ensemble indicateur de vitesse/compte-tours pour véhicule automobile tel que poids lourd qui comprend un commutateur DIP servant à l'étalonnage de l'indicateur de vitesse et un autre commutateur analogue pour l'étalonnage du compte-tours. Avec tous les mini-interrupteurs à zéro, chaque commutateur commande l'instrument correspondant à partir d'un signal à fréquence variable provenant d'un capteur approprié et étalonné au moyen d'un facteur d'étalonnage préchargé dans la mémoire morte d'un microprocesseur de commande desdits instruments. Lorsque tous les mini-interrupteurs sont réglés à 1, chaque commutateur commande l'instrument correspondant à partir de données pré-étalonnées provenant d'une liaison de données. Tous les autres réglages déterminent le facteur d'étalonnage à appliquer au signal non étalonné et le résultat commande le fonctionnement de l'instrument correspondant.

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