Vehicle speed sensor for navigation system

G - Physics – 01 – C

Patent

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G01C 22/02 (2006.01)

Patent

CA 2371807

A vehicle navigation system includes a vehicle displacement sensor comprising a wireless transmitter generating a signal indicating rotational displacement of a vehicle component. A complementary wireless transmitter receives the signal from the transmitter. A computer calculates vehicle speed or displacement based upon the rotational speed or displacement of the vehicle component. In a preferred embodiment, the transmitter is secured to a wheel of the vehicle and generates an RF signal upon each revolution of the wheel.

La présente invention concerne un système de navigation pour véhicule comprenant un détecteur de déplacement de véhicule avec émetteur sans fil qui produit un signal indiquant le déplacement rotatif d'un élément de véhicule. Un émetteur sans fil complémentaire reçoit le signal provenant de l'émetteur. Un calculateur calcule la vitesse ou le déplacement du véhicule sur la base de la vitesse ou du déplacement rotatif de l'élément de véhicule. Dans un mode de réalisation préféré, l'émetteur est fixé à une roue du véhicule et produit un signal RF à chaque révolution de la roue.

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