| 摘要 |
PURPOSE: A method for operating a device for the monitoring and wireless signaling of a pressure change in pneumatic tires of vehicles is provided to extend the lifespan of batteries of the tire pressure monitoring device without degrading the reliability and the stability of the tire pressure changing monitoring performance and operation. CONSTITUTION: A Device for the monitoring and wireless signaling of a pressure change in pneumatic tires of vehicles is mounted in the tire, preferably in the form of a modular unit which also includes the valve of the tire, and a power source, a pressure sensor which measures tire pressure at first intervals, an analog-to-digital converter for digitizing a pressure signal obtained by the pressure sensor, a memory for storing the pressure signal, a transmitter which transmits information about the tire pressure measured to a receiving unit positioned in the vehicle, and a comparator, which notably forms a modular unit with a microprocessor which compares the pressure signal with a previously stored reference pressure signal and controls the transmitter in such a way that the transmitter transmits at second intervals longer than the first intervals, for as long as a decrease per time unit in the pressure signal in relation to the reference pressure signal(drift) does not exceed a threshold value, and that the transmitter transmits at third intervals shorter than the second intervals, if and for as long as drift exceeds the threshold value, thereby modifying the second intervals in accordance with one or more physical states which are measured in the tire and vary under road load.
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