Vehicle tracking, communication and fleet management system

  • US 20060142913A1
  • Filed: 05/10/2005
  • Published: 06/29/2006
  • Est. Priority Date: 12/19/1999
  • Status: Active Grant
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First Claim
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1. A sensor apparatus for producing a signal that indicates the speed and direction of a drum on a ready mix truck comprising an array of magnets mounted about the axis of rotation of the truck'"'"'s mixer drum, and dual magnetic field sensors mounted in fixed confronting relation thereto, wherein the magnets activate the sensors in sequence as they pass in front of the sensors.

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