A wireless communication device includes a transmitter that is provided in a rotary part of a rotary device and transmits a wireless signal; a receiver that is provided in a stationary part of the rotary device, receives the wireless signal, and calculates a communication quality level based on the wireless signal; and processing circuitry to determine a communication cycle based on the communication quality level so that the communication cycle synchronizes with a cycle as a multiple of a rotation cycle of the rotary part by an integer greater than or equal to 1, and to make timing of the communication between the transmitter and the receiver follow the rotation cycle by increasing or decreasing the communication cycle so that the communication quality level increases.

A receiver receives frames transmitted by transmitters respectively attached to wheel assemblies. Each transmitter transmits three or more frames successively at different transmission intervals when a rotation angle of the associated wheel assembly agrees with a specific angle. When receiving the frames, the receiver determines the transmission ordinal numbers of the received ones of the frames from a previously stored correspondence relationship between an order of transmission and transmission intervals of the frames. The receiver derives, from the determined order of transmission of the frames, a specific point in time that is within specified time from the detection of the specific angle. Based on the rotation angle of the wheel obtained by a rotation angle detecting unit at the specific point in time, the receiver identifies the wheel assembly to which each of the transmitters is attached.

A method of monitoring one or more wheels of a vehicle is described. The method includes receiving first accelerometer measurements of a first accelerometer mounted on the vehicle's first wheel when the vehicle is moving during an interval of time, determining based on the first accelerometer measurements a first path followed by the first accelerometer when the vehicle is moving during the interval of time, determining based on the first path that the vehicle's first wheel is out of balance with respect to an axle of the vehicle's first wheel, and responsive to determining that the vehicle's first wheel is out of balance, transmitting to a user device a first alert that the vehicle's first wheel is out of balance.

A method performed by an electronic device to monitor one or more wheels of a vehicle. The method includes receiving first accelerometer measurements of a first accelerometer mounted on the vehicle's first wheel when the vehicle is moving during an interval of time, determining based on the first accelerometer measurements a first path followed by the first accelerometer when the vehicle is moving during the interval of time, receiving second accelerometer measurements of a second accelerometer mounted on a vehicle's second wheel when the vehicle is moving during the interval of time, determining, based on the second accelerometer measurements, a second path followed by the second accelerometer when the vehicle is moving during the interval of time, and determining based on a comparison of the first path with the second path that at least one of the vehicle's first wheel and the vehicle's second wheel is misaligned.

A vehicle has a detecting section that detects, as a detection value, a rotational angle of each wheel assembly. A transmitter provided in each wheel assembly transmits transmission data when the rotational angle of the wheel assembly is any of specific angles. At the performance of transmission at the specific angle, the transmitter changes data that is different from angular data indicating the rotational angle of the wheel assembly and is included in the transmission data in accordance with the specific angle. A vehicle-mounted receiver collects the detection values detected by the detecting section upon reception of the transmission data. The receiver collects the detection values for each piece of the transmission data transmitted at the same specific angle based on a manner in which data included in the received transmission data is changed in accordance with the specific angle.

A method for pairing a measurement module with a wheel of a vehicle including, for each angular orientation signal associated with a specific wheel received by a computer, the steps of transmitting, by the computer, a measurement signal or a request to transmit a measurement signal to each module, measuring, by the computer or each module, a value of at least one parameter differentiating the signal, performing repetitions of the transmissions of measurement signals for each angular orientation signal received by the computer and storing values of the parameter, pairing a specific wheel with a measurement module when the values are substantially constant with a variation of less than 10% for the values, each wheel being associated with a module at the end of the method.

A measurement device for measuring the pressure of a wheel (3) of a vehicle, the measurement device comprising a stationary portion (5) and a movable portion (14) for being driven in rotation by the wheel, the stationary portion including a first printed circuit (7) having at least one first track formed thereon defining a first winding, the movable portion including a second printed circuit (16) having at least one second track formed thereon defining a second winding, the second printed circuit being arranged to be connected to a pressure sensor (15), the first winding and the second winding being coupled together to form a wireless communication channel, the measurement device being arranged in such a manner that the pressure sensor is electrically powered by the stationary portion via the wireless communication channel, and in such a manner that uplink data comprising pressure measurement data is transmitted to the stationary portion (5) by the movable portion (14) via the wireless communication channel.

A wear amount estimation method calculates a shearing force of each rib based on an average grounding pressure of each rib of an aircraft tire; calculates a wear energy of the aircraft tire based on the shearing force; and estimates the wear amount of the aircraft tire based on the wear energy and a wear resistance showing a relationship between a predetermined wear amount. The information related to the aircraft includes an internal pressure of the aircraft tire. The average grounding pressure of each rib is calculated based on the internal pressure and a wheel load applied to the aircraft tire.

A wireless communication device includes a transmitter that is provided in a rotary part of a rotary device and transmits a wireless signal; a receiver that is provided in a stationary part of the rotary device, receives the wireless signal, and calculates a communication quality level based on the wireless signal; and processing circuitry to determine a communication cycle based on the communication quality level so that the communication cycle synchronizes with a cycle as a multiple of a rotation cycle of the rotary part by an integer greater than or equal to 1, and to make timing of the communication between the transmitter and the receiver follow the rotation cycle by increasing or decreasing the communication cycle so that the communication quality level increases.

A tire position determination system includes a first tire detector, a revolving body detector, and a monitoring unit. The first tire detector is attached to a first tire and detects an acceleration. The revolving body detector is attached to a first revolving body and detects an acceleration. The monitoring unit obtains first correspondence representing relation between a first value and a second value during a first period, obtains second correspondence representing relation between a third value and a fourth value during a second period, compares the first correspondence and the second correspondence with each other, and determines whether or not the first tire revolves in synchronization with the first revolving body.