Frequency hopping for smart air springs

摘要

The subject invention relates to an air spring height sensor comprising a transmitter unit (102) for transmitting a height measuring signal, a receiver unit (101) for sensing a height signal, a carrier frequency switching unit (103), and an evaluation unit (200). The receiver unit and the transmitter unit are adapted for being mounted to opposing mounting elements (10, 20) of an air spring (1). The transmitter unit is switchable between different carrier frequencies (121, 122) of a height measuring signal. The evaluation unit comprises a frequency filter (213) being switchable between different carrier frequencies, wherein the carrier frequency switching unit is adapted for switching the carrier frequency of the frequency filter at a predetermined first point of time and the corresponding carrier frequency of the transmitter unit at a predetermined second point of time, wherein the first point of time is prior to the second point of time.

主权项

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; and an evaluation unit, wherein the transmitter unit is switchable between a first carrier frequency and a second carrier frequency of a 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, and wherein the carrier frequency switching unit is adapted for periodically switching the frequency filter from the first carrier frequency to the second carrier frequency of the receiver unit at a periodic predetermined first point of time (t1) and for switching carrier frequency of the transmitter unit from the first carrier frequency to the second carrier frequency at a respective predetermined second point of time (t2).