Patent ID: 7834747

Claim:
Tire air pressure monitoring device for a vehicle with several wheels, each of which is equipped with pneumatic tires, comprising (a) at least one wheel module for each monitored pneumatic tire, in which the wheel module compromises: a pressure sensor, in order to generate an electric pressure signal corresponding to the pneumatic tire air pressure; an acceleration sensor, in order to record the direction of rotation of a rotating wheel on the moving vehicle and to form from it a selection signal corresponding to the vehicle side; a signal data processing device with a data storage device, in which the signal data processing device processes signals formed in the wheel module, including the pressure signal, and generates a radiotelegram, having modulations corresponding to the signals occurring in the wheel module; and an HF transmitting/receiving device coupled to the signal data processing device for telemetric signal data communication with a control device on the vehicle; and (b) the control device mounted stationary on the vehicle, which is equipped with a data signal generation device and a data signal processing device, each supported with a microprocessor, as well as with an HF transmitting/receiving device with at least one assigned antenna, in order to generate demand signals, and send them telemetrically to the wheel modules, and to receive and evaluate the radiotelegrams generated by the wheel modules; wherein the selection signal generated by these acceleration signals on the corresponding wheel modules is entered and stored, directly or in the form of a signal derived from it, in its data storage device and kept ready for correlation with a demand signal of the control device; the control device sends a selecting demand signal that queries the presence or absence of the selection signal, which requires only the wheel modules that have or do not have the stored selection signal to send a radiotelegram within a stipulated time window or time frame; and thereupon, within the stipulated time window or time frame, only the radiotelegrams originating from the selected wheel module or the selected wheel modules are sent.