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Absolute angular position sensing system based on radio frequency identification technology

  • US 7,683,799 B2
  • Filed: 05/03/2007
  • Issued: 03/23/2010
  • Est. Priority Date: 05/03/2007
  • Status: Active Grant
First Claim
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1. A system for determining the position of a crankshaft wheel in an internal combustion engine, said system comprising:

  • a plurality of RFID tags disposed about an outer perimeter of a first crankshaft wheel and a second crankshaft wheel; and

    an RFID transceiver positioned adjacent to the first and second crankshaft wheels, said RFID transceiver transmitting an interrogation signal to the first and second crankshaft wheels that activates the RFID tags and causes the RFID tags to transmit a coded signal that is received by the transceiver and identifies the position of the wheel as it rotates;

    wherein the RFID transceiver provides an output signal to an engine controller that is a pulse-width modulated signal having a duty cycle identifying a bit pattern of the coded signal.

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