Patent ID: 7379800
Filing Date: 2008-05-27
Classification: B60C

Abstract:
1. An arrangement for a vehicle including a wheel assembly with a tire pressure monitoring system, comprising: a wheel rim; a tire mounted on said wheel rim; a housing having an interior in flow communication with an interior of said tire such that the same pressure prevails in said tire and in the interior of said housing; a magnet arranged in said housing and movable in an axial direction of said tire; a Hall effect sensor arranged on a non-rotating part of the vehicle in a position in which said Hall effect sensor is in a magnetic field generated by said magnet during rotation of said tire relative to the non-rotating part of the vehicle; and a spring coupled to said housing and arranged to move said magnet in dependence on pressure in the interior of said housing, said spring being arranged outside of said magnet, whereby said Hall effect sensor senses magnetic field density of said magnet as said magnet rotates, said magnetic field density being convertible into an indication of the pressure in said housing and thus the pressure in said tire.