| 摘要 |
PCT No. PCT/EP96/02304 Sec. 371 Date May 11, 1998 Sec. 102(e) Date May 11, 1998 PCT Filed May 29, 1996 PCT Pub. No. WO97/00784 PCT Pub. Date Jan. 9, 1997A method of operating a device for monitoring vehicle-tire pressures and indicating changes in pressure by radio, which is arranged in the valve of the pneumatic tire and contains a power source; a pressure sensor; an analog/digital converter for digitizing the pressure signal obtained from the pressure sensor; a memory for storing the pressure signal; a transmitter; a comparator, in particular in a module with a microprocessor, which compares the pressure signal with a previously stored comparison pressure signal, generates a signal if the deviation of the pressure signal from the comparison pressure signal exceeds a threshold, and activates the transmitter, which thereupon transmits a datum regarding the detected deviation to a receiver arranged in the vehicle; and a timing switch which activates the device at time intervals for a measurement and comparison operation and otherwise keeps it deactivated for purpose of power conservation. The comparator stores the pressure signal and, with said pressure signal, constitutes a new comparison pressure signal which replaces the previous comparison pressure signal.
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