Device for the transmission of measured values
First Claim
1. A device for the transmission of a measured value from a movable object to an object fixed relative thereto, particularly from a vehicle wheel to the chassis of a motor vehicle, comprising a transmitting stage which transmits a frequency signal and contains an oscillatory circuit, a receiving stage which contains an oscillatory circuit, and a coupling circuit provided on the movable object by way of which circuit a frequency signal can be fed to the receiving stage, characterized in that the oscillatory circuit for the transmitting and receiving stages comprises a single oscillatory circuit common to both stages, means for alternately switching the transmitting stage and the receiving stage to the operative position, said means comprising switches controlled by a pulse generator, which switches switch during a specific first period the transmitting stage to the operative position, and during a specific second period, which follows the first period, switch the receiving stage to the operative position, and means are provided which damp the oscillatory circuit before the receiving stage is switched to the operative position.
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Accused Products
Abstract
An apparatus for transmitting measured value signals from a movable object to an object fixed relative thereto, includes a transmitter and receiver, each containing a common oscillatory circuit, carried on the fixed object, and a coupling circuit, also containing an oscillatory circuit, carried by the movable object, the oscillatory circuits for the transmitter and receiver being alternately switched between operative and inoperative conditions, whereby an oscillatory frequency signal is first transmitted by the transmitter to energize the oscillatory circuit of the coupling circuit, and then the transmitter is switched off and the receiver is switched on to receive the oscillatory frequency signals from the coupling circuit.
26 Citations
9 Claims
- 1. A device for the transmission of a measured value from a movable object to an object fixed relative thereto, particularly from a vehicle wheel to the chassis of a motor vehicle, comprising a transmitting stage which transmits a frequency signal and contains an oscillatory circuit, a receiving stage which contains an oscillatory circuit, and a coupling circuit provided on the movable object by way of which circuit a frequency signal can be fed to the receiving stage, characterized in that the oscillatory circuit for the transmitting and receiving stages comprises a single oscillatory circuit common to both stages, means for alternately switching the transmitting stage and the receiving stage to the operative position, said means comprising switches controlled by a pulse generator, which switches switch during a specific first period the transmitting stage to the operative position, and during a specific second period, which follows the first period, switch the receiving stage to the operative position, and means are provided which damp the oscillatory circuit before the receiving stage is switched to the operative position.
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9. A device for the transmission of a measured value from a movable object to an object fixed relative thereto, particularly from a vehicle wheel to the chassis of a motor vehicle, comprising a transmitting stage which transmits a frequency signal and contains an oscillatory circuit, a receiving stage which contains an oscillatory circuit, and a coupling circuit provided on the movable object by way of which circuit a frequency signal can be fed to the receiving stage, characterized in that the oscillatory circuit for the transmitting and receiving stages comprises a single oscillatory circuit common to both stages, means for alternately switching the transmitting stage and the receiving stage to the operative position, said means comprising switches controlled by a pulse generator, which switches switch during a specific first period the transmitting stage to the operative position, and during a specific second period, which follows the first period, switch the receiving stage to the operative position, the transmitting stage containing a start-stop oscillator in tri-state structure which oscillates with a frequency that corresponds to the resonance frequency of the oscillatory circuit, and is controlled via a monoflop controlled by the pulse generator, and said receiving stage containing a converter which transforms the received frequency signal into a pulse sequence of the same frequency, and also contains a counter fed by the said converter, which counter counts the pulses and transmits a signal after the receiving stage has been switched to the operative position during a specific period, after a specific counter contents is reached.
Specification