A tire pressure monitoring system includes a plurality of detection devices that are provided in respective ones of a plurality of tires of a vehicle and each wirelessly transmit an air pressure signal including air pressure information of tire in response to a request signal and a monitoring device that transmits the request signal to each of the detection devices and receives the air pressure signal transmitted from each of the detection devices in response to the request signal, to monitor air pressure of each of the tires. Each of the detection devices, when receiving a request signal, measures the received signal strength of the received request signal and transmits to the monitoring device an air pressure signal at a different diming in accordance with the measured received signal strength. The monitoring device receives the air pressure signals transmitted from the plurality of detection devices at different timings.

A device for measuring and/or monitoring tire-related variables of a vehicle, having a sensor unit for transmitting, receiving and processing signals, wherein a transmission signal is emitted by an antenna unit of the sensor unit in the direction of an object being measured and wherein a reflection signal reflected by the object being measured is received and analyzed, the sensor unit having a transceiver device, via which a reflection factor, formed as the quotient from the reflection signal reflected by the object being measured and the transmission signal, is measured and via which a resonance frequency and/or a phase difference between the transmission signal and the reflection signal is determined, wherein the transceiver unit comprises a vector network analyzer and an analysis unit, so that a distance to the object being measured is established by detecting the phase difference between the transmission signal and the reflection signal.

Provided is an on-board device and a vehicle communication system that can expand the transmission range of signals that are transmitted from transmission antennas of the on-board device. An on-board device transmits signals to a portable device, from a plurality of first to fourth LF transmission antennas that are provided for a vehicle at positions that are separate from each other. The on-board device includes a transmission unit that transmits the signals from the first to fourth LF transmission antennas such that a transmission range in which the portable device can receive the signals is a range around the vehicle. The transmission unit substantially simultaneously transmits the signals from two or more transmission antennas among the first to fourth LF transmission antennas, to expand the transmission range.

The present invention relates to a wireless tire monitoring device for a vehicle. Accordingly, the wireless tire monitoring device (100) includes: a) a tire pressure/temperature signal transmitting device (110); b) at least one sensor unit (130) for measuring or detecting at least one parameter relating to the conditions of the tire (200); c) an antenna (150) for transmitting signal corresponding to the tire conditions; wherein the wireless tire monitoring device (100) is detachably mounted to a valve stem (210) of the tire (200) and being served as a cap for the valve stem (210); wherein the antenna (150) includes at least one curvature strip (151) configured at same axis (Z-Z) with the valve stem (210) so that it center axis aligns with the valve stem (210) of the tire (200); and wherein the antenna (150) and valve stem (210) share a common axis (X-X) of a tire wheel (230) and adapted to be revolved about the common axis (X-X) of the tire wheel (230).

Provided is an onboard storage device and an onboard storage system that can correctly store identification information of communication devices provided in the tires of the own vehicle even if tire rotation, tire replacement, or the like is performed. A monitoring device detects the existence or absence of a situation in which another vehicle is not present in the periphery of the vehicle. If the monitoring device detects the existence of a situation in which another vehicle is not present, the monitoring device transmits, to each of multiple detection devices that are respectively provided in the tires of the vehicle, a request signal that requests the sensor ID of the detection device. The monitoring device receives the sensor IDs that are transmitted by the detection devices in accordance with the request signals, and stores the received sensor IDs in a sensor ID table.

Method and apparatus are disclosed for monitoring tires of vehicles via personal area networks. An example vehicle includes a body, nodes spaced apart on the body, a tire, a transceiver coupled to the tire, and a tire detector. The tire detector is to determine a tire position based on wireless communication between the transceiver and the nodes, identify a duration that the tire is at the tire position, and present a warning to rotate the tire position when the duration is greater than a predetermined threshold.

A monitoring device receives air pressure signals transmitted from a plurality of detection devices that are respectively provided in tires of a vehicle and wirelessly transmit air pressure signals each including a respective identifier and air pressure information for a respective tire. A storage unit of the monitoring device stores tire positions at which the tires are provided and identifiers of detection devices in correspondence with each other. The monitoring device includes a request signal transmission unit that transmits, a plurality of times, a request signal requesting an identifier to at least one tire position, and an identifier reception unit that receives identifiers that are transmitted from a detection device. The monitoring device specifies the identifier of the detection device provided at the one tire position based on the identifiers that were transmitted in accordance with the request signal, and updates the identifier stored by the storage unit.

A specific multi-band antenna impedance matching circuit and a tire-pressure monitoring device using same are disclosed. The antenna impedance matching circuit includes at least one first, one second and one third inductance unit and at least one first, one second and one third capacitance unit. The first capacitance unit is connected at a first end to first ends of the first and the second inductance unit and at a second end to a ground; the second inductance unit and the second capacitance unit are connected in series; the third inductance unit and the third capacitance unit are connected in parallel; and the third inductance unit is connected at a first end to a first end of the second capacitance unit and at a second end to the ground.

Method and apparatus are disclosed for monitoring tires of vehicles via personal area networks. An example vehicle includes a body, nodes spaced apart on the body, a tire, a transceiver coupled to the tire, and a tire detector. The tire detector is to determine a tire position based on wireless communication between the transceiver and the nodes, identify a duration that the tire is at the tire position, and present a warning to rotate the tire position when the duration is greater than a predetermined threshold.

A method of communicating with a tire pressure monitoring system (TPMS) sensor module includes transmitting, by the TPMS sensor module, a TPMS signal that includes a sensor identifier of the TPMS sensor module; performing, by an interface device, an angle of arrival measurement on the TPMS signal to whether an angular direction thereof with respect to an antenna array of the interface device is within a predetermined angular window; and determining, by the interface device, whether or not to communicate with the TPMS sensor module including establishing communication with the TPMS sensor module on a condition that the angular direction is within the predetermined angular window and not establishing communication with the TPMS sensor module on a condition that the determined angular direction is not within the predetermined angular window.