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ACTIVE FUEL CAP SENSOR USING MAGNETIC IMPULSE DETECTION

  • US 20030102976A1
  • Filed: 12/02/2002
  • Published: 06/05/2003
  • Est. Priority Date: 12/03/2001
  • Status: Abandoned Application
First Claim
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1. An apparatus for monitoring the closed position of a fuel cap relative to a tank connection pipe, comprising:

  • a fuel cap;

    a tank connection pipe having a wall;

    ratchet means connected to the fuel cap for controlling tightening of the fuel cap to the tank connection pipe;

    a magnet connected to the fuel cap;

    a magnetic switch connected to the tank connection pipe; and

    means for sensing abrupt movement of the magnet relative to the magnetic switch, indicating a locked fuel cap condition, by sensing an abrupt change in magnetic field strength of the magnet.

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