Inductive position sensor with frequency converter and Götzel filter for signal analysis

Abstract

The invention relates to a position sensor (100) for detecting the position of a position transmitter, wherein the position sensor (100) can be connected with a first electrical signal source for emitting a first electrical signal with a first frequency and for A second electrical signal source emitting a second electrical signal with a second frequency is connected, the position sensor having: a primary coil (101) for generating an alternating magnetic field with a first frequency; a first secondary coil (103) and the second secondary coil (105), wherein the first secondary coil (103) and the second secondary coil (105) can be magnetically coupled to the primary coil (101) via position transmitters respectively, and wherein the alternating The magnetic field can induce a third electrical signal in the first secondary coil (103) and a fourth electrical signal in the second secondary coil (105); the frequency converter (101) is used to convert the third electrical signal into a first intermediate frequency signal and for converting a fourth electrical signal into a second intermediate frequency signal, wherein a frequency converter (107) is connectable to a second electrical signal source; and a Goetzel filter bank (109) for The demodulation of the first intermediate frequency signal to obtain the first demodulated signal is used for the demodulation of the second intermediate frequency signal to obtain the second demodulated signal.

Description

technical field [0001] The invention relates to a position sensor. Background technique [0002] Motor vehicles usually comprise a plurality of movable objects, the position of which is detected by means of position sensors. In order to detect the position of a movable object, position transmitters, such as passive resonant circuits or metal elements, are usually arranged on the movable object. In order to detect the position of the position transmitter, a differential transformer with one primary coil and two secondary coils is usually used, wherein the primary coil and the secondary coil can be magnetically coupled via the position sensor. [0003] In this case, the primary coil can be excited with a carrier signal in order to induce an electrical signal in the secondary coil. The induced electrical signal can be evaluated for determining the position of the position transmitter, for example by means of a processor or microcontroller. For this purpose, the carrier signa...

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Problems solved by technology

For this, the carrier signal is usually complexly restored

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