A tire state monitoring system includes: tire state acquisition devices installed on tires of a host vehicle, each of the tire state acquisition devices being configured to acquire a tire state quantity; a monitoring device configured to receive an output signal from each of the tire state acquisition devices and perform predetermined processing; and an alerting device configured to issue an alert to a following vehicle. In addition, the monitoring device causes the alerting device to operate when a predetermined abnormality has arisen in the tire state quantity.

A collision avoidance system includes: an onboard acquisition unit provided in a vehicle traveling on a road that acquires state quantity data indicating a state quantity of a pneumatic tire of the vehicle; an onboard transmission unit provided in the vehicle that transmits the state quantity data acquired by the onboard acquisition unit to a data acquisition roadside device installed on the road; an abnormality determination unit that determines whether or not the state quantity data is abnormal; and a management device including a data acquisition unit that acquires the state quantity data from the data acquisition roadside device, a data storage unit that stores the state quantity data acquired by the data acquisition unit, and a data distribution unit that distributes the state quantity data determined as abnormal by the abnormality determination unit.

A collision avoidance system includes: an onboard acquisition unit provided in a vehicle traveling on a road that acquires state quantity data indicating a state quantity of a pneumatic tire of the vehicle; an onboard transmission unit provided in the vehicle that transmits the state quantity data acquired by the onboard acquisition unit to a data acquisition roadside device installed on the road; an abnormality determination unit that determines whether or not the state quantity data is abnormal; and a management device including a data acquisition unit that acquires the state quantity data from the data acquisition roadside device, a data storage unit that stores the state quantity data acquired by the data acquisition unit, and a data distribution unit that distributes the state quantity data determined as abnormal by the abnormality determination unit.

Apparatuses, systems, wireless signal transmission devices, tire pressure monitoring system (TPMS) sensors, and methods of using a loop antenna element for wireless signal transmission are disclosed. In a particular embodiment, a TPMS sensor is disclosed that includes one or more sub-sensors configured to sense data associated with a tire. In this embodiment, the TPMS sensor also includes a printed circuit board (PCB) coupled to the one or more sub-sensors. The PCB has a top surface, a bottom surface substantially parallel to the top surface, and an edge surface between the top surface and the bottom surface. According to this embodiment, the TPMS sensor also includes a loop antenna element on the edge surface of the PCB.

A device for measuring the pressure of a two wheeler tire comprises: a connector to connect the device to a valve of the two wheeler tire; a valve opener to open the valve, so that in the connected state with the valve, pressurized air flows out of the two wheeler tire through the valve into the device, until the pressure in the device corresponds to the pressure in the two wheeler tire; a pressure measuring device to measure the pressure in the device; and a transmitter to wirelessly transmit information about the measured pressure. A method for monitoring the pressure of a two wheeler tire includes: determining the actual pressure and desired pressure of the two wheeler tire; comparing the actual and desired pressures; and indicating the actual pressure and/or the desired pressure and/or the difference between the desired and actual pressures of the two wheeler tire.

A device for measuring the pressure of a two wheeler tire comprises: a connector to connect the device to a valve of the two wheeler tire; a valve opener to open the valve, so that in the connected state with the valve, pressurized air flows out of the two wheeler tire through the valve into the device, until the pressure in the device corresponds to the pressure in the two wheeler tire; a pressure measuring device to measure the pressure in the device; and a transmitter to wirelessly transmit information about the measured pressure. A method for monitoring the pressure of a two wheeler tire includes: determining the actual pressure and desired pressure of the two wheeler tire; comparing the actual and desired pressures; and indicating the actual pressure and/or the desired pressure and/or the difference between the desired and actual pressures of the two wheeler tire.

A number of landings of an aircraft tire is counted according to a method that includes: measuring a physical quantity of air contained inside the tire, the measuring taking place in a discontinuous mode; determining at least one indicator relating to the physical quantity; comparing the at least one indicator with a predetermined threshold associated with the tire; and, if the at least one indicator is greater than the predetermined threshold associated with the tire, incrementing the number of landings of the tire.

A tire position determination system is provided with: a plurality of tire air pressure transmitters each capable of transmitting a first radio signal including air pressure data and a tire ID; a plurality of axle rotation detection units each generating axle rotation information; and a receiver mounted to a vehicle body and capable of receiving the first radio signal. Each of the plurality of tire air pressure transmitters includes a specific position detection unit capable of detecting the arrival of the tire air pressure transmitter at a specific position on a trajectory of rotation of the tire, and a transmission control unit that, based on a result of detection, generates a second radio signal including data indicating the arrival of the tire air pressure transmitter at the specific position on the trajectory of rotation of the tire and the ID. The receiver includes a position determination unit that determines a tire position of the plurality of tires based on the second radio signal.

A tire position determination system is provided with: a plurality of tire air pressure transmitters each capable of transmitting a first radio signal including air pressure data and a tire ID; a plurality of axle rotation detection units each generating axle rotation information; and a receiver mounted to a vehicle body and capable of receiving the first radio signal. Each of the plurality of tire air pressure transmitters includes a specific position detection unit capable of detecting the arrival of the tire air pressure transmitter at a specific position on a trajectory of rotation of the tire, and a transmission control unit that, based on a result of detection, generates a second radio signal including data indicating the arrival of the tire air pressure transmitter at the specific position on the trajectory of rotation of the tire and the ID. The receiver includes a position determination unit that determines a tire position of the plurality of tires based on the second radio signal.

In order to mitigate a need for reprogramming tire pressure sensors after tire rotation, tire change, etc., all sensors on a vehicle are preprogrammed with a lookup table that correlates modulation frequency to axle and wheel end positions on the vehicle. Dual antenna initiator coils are mounted to a vehicle such that each wheel end has one directional antenna directed toward it. Each initiator coil is programmed to modulate its transmission frequency by a predetermined modulation frequency such that each antenna transmits using a different modulation frequency. Each sensor receives a modulated signal, identifies the modulation frequency, and performs a table lookup to determine its axle and wheel end location. The sensor transmits its identified wheel end and axle location to a controller unit along with tire pressure status information for its wheel.