A tire pressure monitoring system includes a plurality of detection devices that are provided a plurality of tires of a vehicle and each wirelessly transmit an air pressure signal including air pressure information in response to a request signal and a monitoring device that transmits the request signal to each of the detection devices and receives the air pressure signal transmitted from each of the detection devices in response to the request signal, to monitor air pressure of each of the tires. The monitoring device includes a request signal transmitting unit that transmits the request signal to a region including one tire position and an air pressure signal receiving unit that receives an air pressure signal. The monitoring device determines whether or not the air pressure signals transmitted from the plurality of detection devices are received and changes the transmission strength of the request signal depending on the determination result.

Provided is a vehicular communication system configured to prevent crosstalk between signals transmitted from an in-vehicle wireless device constituting one wireless communication system such as a TPMS and a mobile device constituting another wireless communication system. The vehicular communication system includes a mobile device wirelessly transmitting a signal related to operation of a vehicle, an in-vehicle wireless device wirelessly transmitting a signal related to the vehicle, and an in-vehicle communication apparatus provided in a different part from the in-vehicle wireless device and wirelessly communicates with the mobile device and the in-vehicle wireless device. The in-vehicle communication apparatus receives signals transmitted from the mobile device and the in-vehicle communication apparatus, and determines whether there is crosstalk. The in-vehicle communication apparatus transmits to the mobile device or the in-vehicle wireless device, a stop signal instructing to stop signal transmission when crosstalk has occurred.

The present invention disclosed herein is a tire pressure monitoring system (TPMS) with a time encoded wireless tire condition sensing device and warning signal, wherein each transmitter ID is assigned its own timing parameter through the controlling device wherein each timing parameter has a different time delay to prevent any launch time transmission overlap. Furthermore, when the main controller receives data from a transmitter indicating abnormal tire condition, the vehicle velocity information is recorded and vibration detection is activated to determine whether there is abnormal vibration and, therefore, whether to transmit vibration warning signal to the display unit and/or to the mobile device of the driver.

An energy-saving positioning method for tire pressure detectors includes the following steps: the vehicle main unit determines whether the engine switch changes from on to off; each tire pressure detector records initial data of at least two axes (X, Y, Z); each detector periodically records subsequent axial data; the vehicle main unit sends an engine start signal to all detectors; each detector compares recorded values with the last recorded values to check for changes; the vehicle main unit evaluates position change messages from detectors and proceeds accordingly. If changes occurred, then go to Step 5A: the main unit skips automatic positioning and uses previous positioning data. If no changes occurred, then go to Step 5B: the main unit initiates automatic positioning. This method effectively reduces positioning frequency compared to traditional systems that require repositioning every engine restart, thereby achieving power conservation while maintaining system accuracy and reliability.

A method for managing messages transmitted via radio waves by a wheel unit to an external electronic unit, clear zones, in which the signal can be transmitted without any alteration, and blackspots, in which the signal risks being altered, are determined, and a specific transmission strategy that optimizes the number of messages in the clear zones is used.