Patent ID: 6538426
Filing Date: 2003-03-25
Classification: F16C,G01D,G01K,G01P

Abstract:
A system for detecting the angular speed of a wheel affixed to an axle by a bearing, the system comprising:a hub unit mounted to the axle of the wheel and rotationally coupled to the wheel, the hub unit comprising a ring magnet positioned substantially in a plane of rotation of the wheel, the ring magnet having a plurality of north and south poles facing radially with respect to an axis of rotation of the wheel; a sensor unit positioned inside said hub unit and rotationally coupled to said axle and operative: to detect a temperature related to a temperature of the bearing; to detect said plurality of north and south poles as the wheel rotates; to produce a signal corresponding to an angular speed of the wheel; and to produce a signal corresponding to said temperature; a first temperature sub-circuit connected to the sensor unit; a second temperature sub-circuit connected to the sensor unit; wherein said signal corresponding to said temperature is carried on said first temperature sub-circuit if the wheel is rotating in a first direction, and said signal corresponding to said temperature is carried on said second temperature sub-circuit if the wheel is rotating in a second direction.