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Device for transmission of measurement values

  • US 4,174,515 A
  • Filed: 11/11/1977
  • Issued: 11/13/1979
  • Est. Priority Date: 11/16/1976
  • Status: Expired due to Term
First Claim
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1. A device for transmission at least of one measurement value from a moveable object to a object stationary relative to the latter, particularly from a motor vehicle wheel to the vehicle frame of a motor vehicle, with a transmitting stage and a receiving stage, which both are secured on the stationary object and a coupling element which is secured on the moveable object and via which the receiver is able to be applied with a measuring value signal, comprisinga transmitting stage means for transmitting two transmission frequency signals of different frequencies,at least one coupling element means for mixing the two different frequencies and for transmitting at least one signal with a mixing frequency,a receiving stage means for being responsive to the at least one signal with a mixing frequency transmitted from said coupling element means,said coupling element means comprises at least one oscillating circuit containing a construction element with a non-linear-current voltage characteristic curve,said coupling element means contains two parallel oscillating circuits including said at least one oscillating circuit, one of said parallel oscillating circuits lies at a frequency within a frequency range which is predetermined by the transmission frequencies, and the other of said circuits is tuned to the mixing frequency, andsaid construction element with a non-linear current-voltage characteristic curve connects both of said two parallel oscillating circuits with each other.

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