초록 ▼

A circuit arrangement for transmitting variable measurement values, such as pressure and temperature, at vehicle wheels is provided which transmits the measurement values in the form of H-F signals to a stationary evaluating circuit (12) with great accuracy, high reliability and in short time interv

A circuit arrangement for transmitting variable measurement values, such as pressure and temperature, at vehicle wheels is provided which transmits the measurement values in the form of H-F signals to a stationary evaluating circuit (12) with great accuracy, high reliability and in short time intervals. A repeater coil (b 13), which is connected with the latter, arranged in the vicinity of the wheel so as to be stationary and connected to voltage by a square-wave generator (15), cooperates with a revolving repeated coil (19) which is fastened at the vehicle wheel and connected with a sensor circuit arrangement (20) supplied by it. The sensor circuit arrangement (20) contains a timing element (29) which responds to a voltage peak in the revolving repeater coil (19 l) at the end of a voltage pulse of the square-wave generator (15) and, with a corresponding delay, triggers a timing circuit (30) for transmitting the measurement values, which timing circuit (30) is connected with it on the output side, wherein the delay time of the timing element (29), together with the duty cycle of the timing circuit (30), is shorter than the pause time of the square-wave voltage at the square-wave generator (15).

대표청구항 ▼

Circuit arrangement for transmitting variable measurement values, such as pressure and temperature, at vehicle wheels, comprising a repeater coil which is arranged at the vehicle in the vicinity of the wheel so as to be stationary and which is connected, on the one hand, to a square-wave generator (

Circuit arrangement for transmitting variable measurement values, such as pressure and temperature, at vehicle wheels, comprising a repeater coil which is arranged at the vehicle in the vicinity of the wheel so as to be stationary and which is connected, on the one hand, to a square-wave generator (15) for supplying energy to a sensor circuit arrangement which revolves with the vehicle wheel and, on the other hand, to an evaluating circuit for transmitting measurement values in the voltage pauses of the square-wave generator (15), and comprising a revolving repeater coil which is fastened at the vehicle wheel, cooperates with the stationary repeater coil and is connected with the sensor circuit arrangement at the vehicle wheel for supplying energy on the one hand and for transmitting the measurement values on the other hand; the sensor circuit arrangement comprises a measurement value converter which transmits the measurement values produced by at least one sensor to the repeater coil in the form of H-F signals in the voltage pauses of the square-wave generator and whose frequency is a multiple of the frequency of the square-wave generator, characterized in that the sensor circuit arrangement (20) also contains a timing element (29) which responds to a voltage peak (Ui) in the revolving repeater coil (19) produced by means of the end of a voltage pulse (Ua) at the square-wave generator (15) and which triggers a timing circuit (30) with a corresponding delay time (T1) for transmitting the measurement values, which timing circuit (30) is connected with it on the output side, wherein the delay time (T1) of the timing element (29), together with the duty cycle (T2) of the timing circuit (30), is shorter than the pause time (t2) of the square-wave voltage at the square-wave generator (15).