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Frequency hopping for smart air springs

  • US 10,138,974 B2
  • Filed: 04/27/2016
  • Issued: 11/27/2018
  • Est. Priority Date: 11/21/2012
  • Status: Active Grant
First Claim
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1. An air spring height sensor comprising:

  • a transmitter unit for transmitting a height measuring signal,a receiver unit for sensing a height signal,a carrier frequency switching unit, andan evaluation unit,wherein the transmitter unit is switchable between a first carrier frequency and a second carrier frequency of the height measuring signal,wherein the evaluation unit comprises a frequency filter being switchable between the first carrier frequency and the second carrier frequency,wherein the carrier frequency switching unit is adapted for switching the frequency filter at the receiver unit from the first carrier frequency to the second carrier frequency at a predetermined first point of time (t1) and for switching a carrier frequency of the transmitter unit from the first carrier frequency to the second carrier frequency at a predetermined second point of time (t2),wherein the first point of time is prior to the second point of time,wherein the evaluation unit is adapted for detecting, after the first point of time but prior to the second point of time, whether the first carrier frequency or the second carrier frequency is sufficiently free of interferences for subsequent evaluation of the height measuring signal, andwherein the first carrier frequency or the second carrier frequency is sufficiently free of interferences when a signal to noise ratio of the sensed height signal meets or exceeds a threshold.

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