Patent ID: 7319380

Claim:
A system for monitoring and wireless signaling of a pressure or a change of pressure in pneumatic tires on vehicles, comprising: wheel electronics that are disposed inside the pneumatic tires and are provided with a battery as a power source, the electronics comprising a pressure sensor for measuring the pressure or the change of pressure, a RF-transmitter for transmitting a signal derived from the signal of the pressure sensor, and a first receiver for receiving wireless interrogation signals and/or control signals, a second receiver arranged in or on the vehicle and which receives the signal derived from the signal of the pressure sensor, a device for signaling to the driver information relating to the pressure or change of pressure, and transmitters for emitting interrogation signals and/or control signals, the transmitters being disposed, respectively, individually near each running wheel and having a transmission frequency of less than 1 MHz, said transmitter for emitting interrogation and/or control signals comprising an oscillating circuit comprising a radiator and an amplifier having an amplifier input and an amplifier output, the amplifier output being coupled back to the amplifier input via the radiator.