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Inductive sensor unit

  • US 20060132120A1
  • Filed: 09/30/2005
  • Published: 06/22/2006
  • Est. Priority Date: 12/17/2004
  • Status: Active Grant
First Claim
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1. An inductive sensor unit (1), for detecting the position of a vehicle seat or for a gate shifting unit of an automatic transmission comprising:

  • a plurality of sensor coils (L1, . . . , Li) disposed in planar fashion on a printed circuit board (3), a conductive actuation element (7), adapted to be guided in spaced apart relationship (a), on a path over the sensor coils (L1, . . . , Li), an electrical evaluation circuit (5, 11-17), for detecting changes in inductance of the sensor coils (L1, . . . , Li) in accordance with a path position (x) of the actuation element (7) and for converting the changes into electrical signals corresponding to seat position signals or gear shifting signals, wherein the actuation element (7) is guided, spaced apart (9, 9

    ) on both sides, over the sensor coils (L1, . . . , Li), and the electrical evaluation circuit (5, 11-17) detects the inductances of all the sensor coils (L1, . . . , Li) and converts them by means of an algorithm into a current path position (x) of the actuation element (7).

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