Tire-monitoring system and method therefor

A method for monitoring a tire air pressure and/or at least one other tire-specific variable in tires of a vehicle, in particular of a trailer or semitrailer of a truck, having the following steps:

• detecting the tire air pressure and/or the at least one other tire-specific variable using a detection unit of a tire sensor in a tire and transmitting signals as a function of the detected variable by means of a transmitter of a control device of the tire sensor to a router in the vehicle;
• receiving the signals transmitted by means of the transmitter by means of a receiver of the router and storing the variables transmitted with the signals in a memory of the router;
• wherein
• the router is supplied with electrical power for receiving the signals and storing the variables during driving operation of the vehicle via an electrical power terminal from an onboard electrical system of the vehicle;
• characterized in that
• the router is supplied with electrical power from an energy storage of the router outside the driving operation of the vehicle when the onboard electrical system is turned off, wherein the energy storage is chargeable via the electrical power terminal when the onboard electrical system is turned on, and
• at least also when the onboard electrical system is turned off and the router is supplied with electrical power using its energy storage, a mobile communication device is at least indirectly coupled to an interface of the router for the wired or wireless query of the variables stored in the memory, which communication device connects itself via an Internet access to a database having router-specific data and initiates a bidirectional data connection with bidirectional data exchange between the database and the router either via a direct wireless connection between the router and the database or via an indirect connection via the mobile communication device.