Provided is a pneumatic tire with a tread portion, a sidewall portion, a bead portion, and a sound absorbing member bonded to the tire inner surface. A sheet-like heat transfer member is provided between the tire inner surface and the sound absorbing member to extend outward from the region where the sound absorbing member is bonded, which forms a heat dissipation part projecting from the sound absorbing member in the heat transfer member.

Sensor and method for determining operating states associated with one or more tires. The operating state of the tire can be determined based on one or more measures environmental conditions of the tire(s). For example, a controller can be configured to determine a change in one or more environmental conditions, including determining, for example, a rate-of-change value, a variance value, a standard deviation, or the like. The rate-of-change, variance, and/or standard deviation values can be compared to one or more threshold values to determine the operating state(s) associated with the tire(s). The environmental condition can include, for example, acceleration of the tire, pressure of the tire, and/or temperature of the tire. The operating state can be, for example, a filling state indicative of the tire being inflating, and/or a drive state indicative of the tire rotating about its axle.

A pneumatic tire is provided that enables communication performance and scratch resistance of a transponder to be improved, A transponder (20) that extends along a tire circumferential direction is embedded between a carcass layer (4) and an innerliner layer, and the transponder (20) is disposed between a position (P1) located on an outer side of and 15 mm away from an upper end (5e) of a bead core (5) in a tire radial direction and a position (P2) located on an inner side of and 5 mm away from an end (7e) of a belt layer (7)in the tire radial direction.

A pneumatic tire is provided that enables communication performance and scratch resistance of a transponder to be improved, A transponder (20) that extends along a tire circumferential direction is embedded between a carcass layer (4) and an innerliner layer, and the transponder (20) is disposed between a position (P1) located on an outer side of and 15 mm away from an upper end (5e) of a bead core (5) in a tire radial direction and a position (P2) located on an inner side of and 5 mm away from an end (7e) of a belt layer (7)in the tire radial direction.

A tire and wheel assembly comprises: a tire including a tread portion; a wheel including a rim portion on which the tire is mounted; and a power reception coil, wherein one or more circumferential main grooves extend in a tire circumferential direction on a tread surface of the tread portion, and at least one circumferential main groove satisfies OTD≥SBG in a reference state.

A tire and wheel assembly comprises: a tire including a tread portion; a wheel including a rim portion on which the tire is mounted; and a power reception coil, wherein one or more circumferential main grooves extend in a tire circumferential direction on a tread surface of the tread portion, and at least one circumferential main groove satisfies OTD≥SBG in a reference state.

When information related to road surface conditions is conveyed from a vehicle body side system to a tire-mounted sensor and the tire-mounted sensor determines the road surface condition, an integrated voltage value is corrected based on the information related to the road surface condition. It is thus possible to estimate the road surface condition more accurately. Furthermore, in as much as the road surface condition is estimated at each tire-mounted sensor, the road surface condition can be estimated for each wheel.

A road surface state determination device includes a tire-side device and a vehicle-body-side system. The tire-side device is attached to a back surface of a tread of each of a plurality of tires included in a vehicle. The vehicle-body-side system is included in a body of the vehicle. The tire-side device outputs a detection signal corresponding to a magnitude of vibration applied to the tire. The tire-side device generates road surface data indicative of a road surface state appearing in a waveform of the detection signal. The tire-side device transmits the road surface data. The vehicle-body-side system performs bidirectional communication with the tire-side device and receives the road surface data. The vehicle-body-side system determines the road surface state of a road surface on which the vehicle is traveling based on the road surface data.

A road surface state determination device includes a tire-side device and a vehicle-body-side system. The tire-side device is attached to a back surface of a tread of each of a plurality of tires included in a vehicle. The vehicle-body-side system is included in a body of the vehicle. The tire-side device outputs a detection signal corresponding to a magnitude of vibration applied to the tire. The tire-side device generates road surface data indicative of a road surface state appearing in a waveform of the detection signal. The tire-side device transmits the road surface data. The vehicle-body-side system performs bidirectional communication with the tire-side device and receives the road surface data. The vehicle-body-side system determines the road surface state of a road surface on which the vehicle is traveling based on the road surface data.

Systems and methods for an energy harvester proximate to a rotatable component of a vehicle's wheel are disclosed. In some embodiments, an energy harvester system includes: a plurality of energy harvesting components configured to be coupled to a rotatable component in a ring formation along a circumference of the rotatable component, wherein each of the plurality of energy harvesting components includes: a substrate configured to be attached to a surface of the rotatable component; a piezoelectric component coupled to a surface of the substrate, wherein the piezoelectric component is configured to deform in response to a mechanical strain imparted on the piezoelectric component as the rotatable component rotates and generate an electric signal; and an interconnect coupled to the piezoelectric components and configured to conduct the electric signal from the piezoelectric components to a device coupled to the rotatable component.