Disclosed is a method for driving a processor of an electronic box mounted on a vehicle wheel, transmitting operating parameters of the wheel for implementation of a specific application by a central unit. This includes defining, for each specific application, the physical quantities liable to affect the relevance of the operating parameters, and ranges of measured values corresponding to conditions for obtaining relevant values of the operating parameters. Also included is a procedure for acquiring and transmitting the operating parameters consisting of a succession of transmission windows, during each of which the physical quantities selected for the application are measured, it is checked whether the conditions for obtaining relevant values of the operating parameters are met. If so, at least one value of each parameter is acquired and transmitted, while assigning to this value a datum attesting to the relevance of the latter, and then the transmission window is closed.

A tire pressure detection device includes a chip, a Bluetooth receiving circuit, a Bluetooth antenna, a battery, an LF trigger coil, a power switch, an LF trigger switch and a monitor respectively connected to a case. The Bluetooth receiving circuit is electrically connected to the chip and the Bluetooth antenna. The LF trigger coil, the power switch, the LF trigger switch and the monitor are respectively connected to the chip. A user holds and inserts the tire pressure detection through a double rims. The chip sends an LF signal via the LF trigger coil to activate a Bluetooth tire pressure detector at the inner rim to detect tire pressure. A pressure signal of an inner tire is sent to the chip via the Bluetooth antenna and the Bluetooth receiving circuit. The chip displays the tire pressure of the inner tire on the monitor to be checked by the user.

A radiofrequency transmission device (D) includes: a transmission unit (10) for transmitting a voltage signal (S) in pulsed form; a radiofrequency antenna (A); filtering elements (30); and a voltage source (Vcc), wherein the filtering elements (30) include: n coils (B.sub.1, B.sub.2. . . B.sub.n), electrically connected in series, of which (n1) coils each have a natural resonance frequency such that:

f.sub.RLi=if.sub.F each having an inductance (L.sub.i) such that, at the predetermined fundamental frequency:

L.sub.TOT=L.sub.1+L.sub.2+ . . . L.sub.i+ . . . L.sub.n=Z.sub.TOT=Z.sub.1+Z.sub.2+ . . . Z.sub.i+ . . . Z.sub.n

and

L.sub.i=Z.sub.i

where f.sub.RLi Is the natural resonance frequency of the i-th coil i is a number varying from 2 to n, L.sub.TOT is the total inductance of the n coils, L.sub.i is the inductance of the i-th coil, Z.sub.TOT is the total impedance of the n coils, Z.sub.i is the impedance of the i-th coil, n is an integer greater than zero.

A tire position determination system includes a position determination unit that determines a tire position by obtaining axle rotation information when each of tire pressure transmitters reaches a specific position on a tire rotation path of a corresponding tire and specifying a tire that rotates in synchronism with the axle rotation information of each axle. A cycle calculator calculates a rotation cycle of each axle based on the axle rotation information. A validity determination unit determines validity of accuracy of gravity sampling based on the rotation cycle, a gravity sampling interval time of a gravitational component acting on each tire pressure transmitter, and a gravity sampling frequency in the rotation cycle. The position determination unit determines the tire position based on a determination result of the validity determination unit.

A tire pressure monitoring sensor comprises an environmental pressure sensor, a non-volatile memory for storing a first program and a second program, a processing unit for executing the first program, a communication module including a wireless transmitter for transmitting at least one parameter indicative of conditions within a tire and a wireless or wired receiver for loading the second program into the non-volatile memory and a battery for powering the sensor. The second program contains a sensor operation description which is used by the first program.

A tire-monitoring device is arranged on a tire and includes a tire pressure sensor and a temperature sensor respectively sense tire pressure and temperature and respectively generate a tire pressure signal and a temperature signal received by a controller. When the controller determines that the tire pressure value continuously varies for a preset period or determines that a rising variation of the temperature value is larger than a preset variation, the controller generates a transmission control signal received by a wireless transmitter. The wireless transmitter transmits the tire pressure signal and the temperature signal to an external device, so as to display the tire pressure value and the temperature value. The present invention directly observes that the vehicle has started according to the continual variation of the tire pressure value and the variation of the temperature value and notifies the transmitter that the transmitter transmits the signal.

A tire pressure measuring module for a vehicle tire includes a receiving space in which are disposed a pressure sensor, a control circuit coupled to the pressure sensor and a transmitter for wireless transmission of data from the control circuit to a vehicle side receiver. The receiving space is designed to be attached to the vehicle tire. The control circuit has programmable storage devices and a programming interface for writing on the storage device is designed with contact areas. The contact areas are galvanically contacted by contact pins of an associated programming device. The contact areas are covered by an elastic insulating layer which is designed so that it can be perforated by the contact pins.

Systems and methods for implementing two-way tire pressure monitoring system (TPMS) learning and authenticated pairing. A random value may be used to determine a test value and a pairing PIN by use of a HMAC (Hash-based Message Authentication Code) function and a pre-shared key that is accessible to a TPMS sensor and a vehicle (e.g., controller system thereof). The random value and test value may be broadcasted by the TPMS sensor and received by the vehicle. The vehicle may calculate the pairing PIN using the random value and the pre-shared key.

A radiofrequency transmission device (D) includes: a transmission unit (10) for transmitting a voltage signal (S) in pulsed form; a radiofrequency antenna (A); filtering elements (30); and a voltage source (Vcc), wherein the filtering elements (30) include: n coils (B.sub.1, B.sub.2 . . . B.sub.n), electrically connected in series, of which (n1) coils each have a natural resonance frequency such that:

f.sub.RLi=if.sub.F each having an inductance (L.sub.i) such that, at the predetermined fundamental frequency:

L.sub.TOT=L.sub.1+L.sub.2+ . . . L.sub.i+ . . . L.sub.n=Z.sub.TOT=Z.sub.1+Z.sub.2+ . . . Z.sub.i+ . . . Z.sub.n

and

L.sub.i=Z.sub.i

where f.sub.RLi Is the natural resonance frequency of the i-th coil i is a number varying from 2 to n, L.sub.TOT is the total inductance of the n coils, L.sub.i is the inductance of the i-th coil, Z.sub.TOT is the total impedance of the n coils, Z.sub.i is the impedance of the i-th coil, n is an integer greater than zero.

Disclosed is a method of exchanging cryptographic parameters in a network of tire monitoring devices, the method including broadcasting, from each tire monitoring device to a plurality of other tire monitoring devices, a message comprising a cryptographic parameter generated by that respective tire monitoring device.