Embodiments included herein are directed towards systems and methods for tire pressure monitoring. Embodiments may include transmitting a first Bluetooth Low Energy (“BLE”) event at a Phase Auto-Location (“PAL”) block associated with a vehicle electronic control unit (“ECU”). Embodiments may further include generating a random number to be used for an inter-event delay associated with a BLE system, wherein the inter-event delay includes a fixed time and a randomized delay. Embodiments may also include calculating a time for the randomized delay and adding the time to an encoded Look Back Time (“LBT”) from the first BLE event to generate frame contents. Embodiments may further include providing the frame contents and the random number to a stack for transmission.

A method for determining the position of a radial acceleration sensor of a wheel of a motor vehicle, including: acquiring, by the sensor, signals S.sub.i which are acquired during a predetermined time window W.sub.i when the vehicle is in motion, the windows W.sub.i being different from one another; detecting, for each time window W.sub.i, local extrema of the signal S.sub.i; determining, for each time window W.sub.i, a frequency F.sub.i of the rotation of the wheel of the vehicle as a function of the phase values and of the detection instants for the local extrema detected; filtering of the signals S.sub.i, so as to obtain, for each time window W.sub.i, a filtered value Z.sub.i; and determining the radial distance R.sub.c between the radial acceleration sensor and the axis of rotation of the wheel.

A method for sampling wheel acceleration, a method for determining rotation angular position of a wheel, and a tire pressure monitoring system are disclosed. The method for sampling wheel acceleration may include: acquiring a real-time wheel acceleration value of a target wheel and calculating a time length required to rotate for a preset number of revolutions of the target wheel according to a first association relationship between the wheel acceleration and the time length required to rotate for the preset number of revolutions of the target wheel; obtaining a time interval between any two adjacent sampling points according to the time length required to rotate for the preset number of revolutions; and sampling the wheel acceleration of the target wheel once every the time interval starting from any time.

A transmitter includes a power source of the transmitter, a condition detecting section that detects a condition of a tire, a data generating section that generates transmission data that contains tire condition data indicating the condition of the tire detected by the condition detecting section, a transmitting section that modulates the transmission data and transmits the modulated data, a storage section storing a correspondence relationship in which values of a specific bit among bits of the transmission data that change as the wheel assembly rotates are respectively assigned to specific angles set for the rotation angle of the wheel assembly, and a transmission control section that transmits the transmission data from the transmitting section when detecting that the rotation angle of the wheel assembly is any of the specific angles.

A tire pressure monitoring unit is mounted on a vehicle wheel having a pressure and acceleration sensor. A method for assigning wheel positions includes pressure and acceleration data determined from the sensors. The pressure data and at least one piece of information derived from the acceleration data are transmitted wirelessly in a data telegram together with a characteristic identifier. Information concerning the reliability of the information derived from the acceleration data is acquired in the tire pressure monitoring unit on the basis of the measurements and is transmitted with the data telegram. A central evaluation unit considers a plurality of data telegrams and, taking account of data from the ABS sensors, assigns the individual tire pressure monitoring units to wheel positions. Data telegrams in which the reliability is higher receive a greater weighting, and data telegrams in which the reliability is smaller receive a smaller weighting.

A method for estimating the external radius R.sub.e of a tire fitted to a wheel of a motor vehicle, the wheel including a radial acceleration sensor. The method includes: acquiring, by the sensor, a signal S when the vehicle is in motion under non-steady-state conditions, detecting local extrema of the signal S which are respectively associated with phase values and with detection instants, determining a variation in frequency F′ of rotation of the wheel as a function of said phase values and of said detection instants, determining, for at least one detection instant, a discrepancy between the local extremum associated with said detection instant and a reference signal obtained by eliminating the fluctuations in the signal S, determining a value for the longitudinal acceleration V.sub.al of the vehicle as a function of the at least one discrepancy, estimating the external radius R.sub.e as a function of V.sub.al and F′.

A method for determining the position of a radial acceleration sensor of a wheel of a motor vehicle, including: acquiring, by the sensor, signals S.sub.i which are acquired during a predetermined time window W.sub.i when the vehicle is in motion, the windows W.sub.i being different from one another; detecting, for each time window W.sub.i, local extrema of the signal S.sub.i; determining, for each time window W.sub.i, a frequency F.sub.i of the rotation of the wheel of the vehicle as a function of the phase values and of the detection instants for the local extrema detected; filtering of the signals S.sub.i, so as to obtain, for each time window W.sub.i, a filtered value Z.sub.i; and determining the radial distance R.sub.c between the radial acceleration sensor and the axis of rotation of the wheel.

A method for locating at least one wheel of a vehicle, the wheels each being equipped with an electronic device which sends a wheel rotation signal to a central unit, a speed sensor for each wheel which supplies a signal to the central unit. For each electronic device, at least two sequences of several acquisitions are performed by formation of the signal with simultaneous acquisition by the central unit of the signal transmitted by each speed sensor. A pairing is performed of the two signals for an electronic device with each of the wheel speed signals. For each pair, a phase offset is measured between the two signals. When a constant phase offset is measured in the pairs with a speed sensor, the electronic device associated with the signal is identified as being assigned to the wheel associated with the speed sensor.

A measuring device for a deformable vehicle tire having a sensor unit, a first data processing unit, and a first radio unit, where the sensor unit is designed to be fastenable to the inside of the vehicle tire such that a radial acceleration acting in a radial direction on a tread of the vehicle tire can be detected by means of the sensor unit, where the first data processing unit is configured to determine a result value, relevant for a tire mileage of the vehicle tire, at least on the basis of the radial acceleration and at least one predetermined tire parameter of the vehicle tire, where each tire parameter characterizes a property of the vehicle tire, and where the first radio unit is designed to transmit a radio signal which represents the determined result value.

A method for estimating the external radius R.sub.e of a tire fitted to a wheel of a motor vehicle, the wheel including a radial acceleration sensor. The method includes: acquiring, by the sensor, a signal S when the vehicle is in motion under non-steady-state conditions, detecting local extrema of the signal S which are respectively associated with phase values and with detection instants, determining a variation in frequency F′ of rotation of the wheel as a function of said phase values and of said detection instants, determining, for at least one detection instant, a discrepancy between the local extremum associated with said detection instant and a reference signal obtained by eliminating the fluctuations in the signal S, determining a value for the longitudinal acceleration V.sub.al of the vehicle as a function of the at least one discrepancy, estimating the external radius R.sub.e as a function of V.sub.al and F′.