Method and device for detection of the displacement position of a motor vehicle seat

A device for detecting a displacement position of a vehicle seat, the device comprising:

• a magnetic field-sensitive sensor device and at least one permanent magnet for generating a magnetic field, whose change along a displacement length of the vehicle seat is detected with the magnetic field-sensitive sensor device to assess an adjustment position of the vehicle seat from an output signal of the sensor device;
• and
• a seat rail having a top rail and a bottom rail, on which there is arranged a measuring section whose length corresponds at least to a maximum displacement length of the vehicle seat, the magnetic field-sensitive sensor device being displaceable relative to a longitudinal extension of the measuring section when the vehicle seat is being displaced, the at least one permanent magnet along the measuring section being arranged for generating a magnetic field along the measuring section with an essentially continuously changing magnetic field strength whose absolute value is detectable at one displacement position by the magnetic field-sensitive sensor device, the absolute value of the magnetic field strength being converted into information about an absolute displacement position of the vehicle seat during operation, wherein the magnetic field-sensitive sensor device is a Hall sensor and on ends of the measuring section there are arranged:
• two permanent magnets which are aligned such that they border two ferromagnetic components with magnetic poles which are opposite one another, the two ferromagnetic components bordering a longitudinal gap which forms the measuring section and in which the Hall sensor can be displaced relative to a longitudinal extension thereof.