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Electronic hubodometer

  • US 4,989,222 A
  • Filed: 05/22/1989
  • Issued: 01/29/1991
  • Est. Priority Date: 05/22/1989
  • Status: Expired due to Fees
First Claim
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1. Apparatus for attachment to a structure for sensing a rotation of the structure, the apparatus comprising a first portion having means for coupling to the structure such that the first portion rotates therewith, the apparatus further including a second portion stabilized against rotation and disposed relative to the first portion such that the first portion rotates about the second portion, the first portion including an object and the second portion including a plurality of sensor means each of which has an output for indicating the presence of the object in proximity thereto, the plurality of sensor means being disposed relative one to another such that all of the sensor means do not simultaneously sense the presence of the object as it rotates thereby, the apparatus further including means coupled to the sensor means outputs for converting output signal therefrom to distance-related information, the converting means including means for determining that the first portion has undergone one revolution relative to the second portion, the determining means being responsive to a predetermined number of the sensor means sensing the proximity of the object in a predetermined sequence for discriminating against a transient motion that would otherwise affect a single sensor means relative to the object.

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