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Apparatus and method for the redundant, absolute position determination of a movable body

  • US 10,132,649 B2
  • Filed: 02/28/2013
  • Issued: 11/20/2018
  • Est. Priority Date: 02/29/2012
  • Status: Active Grant
First Claim
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1. An apparatus for contactlessly detecting the absolute position of an element which is movable relative to magnetosensitive sensors and has a magnetic field source fastened on the movable element, two magnetosensitive sensors which are in one plane and are spatially offset in the direction of movement being arranged at a distance from the magnetic field source in such a manner that a first sensor signal can be measured using the first magnetosensitive sensor and a second sensor signal can be measured using the second magnetosensitive sensor, the first sensor signal and the second sensor signal representing a component of the magnetic field and the sensor signals having a phase offset φ

  • in the range of 0°

    <

    φ

    <

    180°

    or 180°

    <

    φ

    <

    360°

    ,wherein the apparatus has a redundant design such that it has two sensor elements, two such magnetosensitive sensors being arranged in each sensor element, and the magnetosensitive sensors and the sensor elements being integrated together on a sensor chip,the apparatus further comprising evaluation electronics configured to calculate an absolute position of the magnetic field source using a normalized sum signal and a normalized difference signal, wherein the absolute position for the sensor signals from each sensor element is redundantly determined.

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