Arrangement for transmitting signals from a device monitoring tire pressure on the wheels of a motor vehicle to an evaluation device arranged in a motor vehicle

DETAILED DESCRIPTION What is claimed is: 1.
An arrangement for transmitting signals from a device (3) for monitoring the tire pressure in vehicle wheels (1), being arranged in the tire, and comprising a pressure sensor arranged for measuring the tire pressure and generating an electric pressure signal, a control circuit, a battery as power source, and a transmitter with a sending antenna for transmitting the measured pressure signal as a radio-frequency (RF) signal under the control of the control circuit to a central evaluation and control unit (8), which is arranged in the vehicle (2) and which is connected to receiving antennas (4), to which individual wheels (1) or groups of wheels (1) of the vehicle (2) are allocated, via a RF receiver which comprises a demodulator and transforms the received RF signals to low-frequency (LF) signals, characterized in that there is arranged, at each receiving antenna (4), a single-channel RF receiver (5) with demodulator (6) so that low frequency signals instead of RF signals are transmitted via unshielded electric lines (7).
2.
The arrangement as defined in claim 1, characterized in that the electric lines (7) are unshieled.
3.
The arrangement as defined in claim 1, characterized in that each receiving antenna (4) and the allocated single-channel RF receiver (5) with demodulator (6) are combined in one module.
4.
The arrangement as defined in claim 1, characterized in that the said the single-channel RF frequency receivers (5) are supplied with the voltage required for their operation from the central evaluation and control unit (8) via the electric lines (7) that serve to transmit the LF signals.
5.
The arrangement as defined in claim 1, characterized in that the single channel RF receiver (5) is designed to generate a digital signal strength proportional to the received RSSI level and that the RF receiver (5) transmits said digital RSSI signal together with the demodulated digital received signal, containing the tire-pressure information, to the central evaluation and control unit (8) via the respective electric line (7)