A pneumatic tire in accordance with the present disclosure comprises a first sound damper fixed to a tire inner surface and being made of a sponge material; a second sound damper disposed on an inner-tire space side of the first sound damper, and being made of a sponge material; and a sensor retained to at least the first sound damper, the sensor being configured to detect a displacement of the tire inner surface or a physical quantity calculable based on the displacement of the tire inner surface, wherein the first sound damper has a hardness greater than a hardness of the second sound damper.

Method (200), and related system (100), for monitoring a status of a tyre (99) fitted on a vehicle, the method (200) comprising: in a first operative phase with the tyre (99) in a reference status: during an advancement of the vehicle, acquiring (3) at least one first signal representative of a motion of a crown portion (31) of the tyre (99); obtaining (4) a first frequency spectrum of the at least one first signal, the first frequency spectrum comprising a first plurality of peaks; identifying (5) a first determined peak in the first plurality of peaks and determining a first frequency of the first determined peak; in a second operative phase subsequent to the first operative phase: during an advancement of said vehicle, acquiring (6) a second signal representative of the motion of the crown portion (31); obtaining (7) a second frequency spectrum of the second signal, the second frequency spectrum comprising a second plurality of peaks; identifying (8) a second determined peak in the second plurality of peaks corresponding to the first determined peak in the first plurality of peaks, and determining (9) a second frequency of the second determined peak; determining (10) a reference frequency as a function of the first frequency of the first determined peak; determining (11) a current frequency as a function of the second frequency of the second determined peak; monitoring (12) the status of the tyre (99) based on a comparison between the current frequency and the reference frequency, or between two values of a same physical quantity, the two values being correlated to the current frequency and to the reference frequency respectively, wherein the physical quantity is a mass or a moment of inertia or a stiffness of the tyre (99).

A method for checking and/or monitoring the use of a tire (1) mounted on a vehicle (7), comprises the following steps: acquisition, by a microphone (10) arranged inside the tire, of an acoustic response of said tire (1) obtained under the effect of a pulsed mechanical stress thereon, and processing of said response in the frequency domain, characterized in that said processing identifies, in the response in the frequency domain, two spectrum spikes situated on either side of a reference frequency corresponding to the first cavity mode of the tire and, as a function of the frequency deviation between the two duly identified spikes, determines information relating to at least one parameter of use of the tire.

A device for determining a rotational speed and a vibration of a wheel end of a vehicle, in particular a truck, is disclosed. The device includes a single sensor measuring a signal during a rotation of the wheel end. The sensor is arranged at the wheel end, and a determination unit for determining the rotational speed and the vibration of the wheel end using the signal of the single sensor is provided.

In order to provide a method for accurately determining the road surface state even when the tire state and external information change, when determining the state of the road surface from the time-varying waveform of vibration of a tire during travel detected by a vibration detection means, in addition to the vibration waveform of the tire, tire state information and external information inputted to the tire are acquired, and a determination parameter for determining the road surface state calculated from the tire vibration waveform is corrected or modified on the basis of the acquired tire state information or external information, and either the road surface state is determined using said corrected or modified determination parameter, or the road surface state is determined from the determination parameter and the state information or external information.

A control unit of a tire-mounted sensor determines whether a tire has been exchanged. When the tire has been exchanged, the control unit changes the threshold value of a road surface state determination condition used for detecting the road surface state from vibration data of the tire detected by an acceleration sensor of the tire-mounted sensor. For example, the threshold value of the road surface state determination condition is reset upon determining that the tire has been exchanged, by transmitting an instruction to the tire-mounted sensor through a tool at an automobile maintenance shop, etc.

A system for monitoring parameters of a vehicle wheel assembly includes a wheel speed sensor configured to produce a wheel speed signal, and a wheel assembly monitoring module operatively connected to the wheel speed sensor. The wheel assembly monitoring module determines a dynamic response of the wheel speed signal at one or more wheel speeds. A wheel assembly health module provides one of a visual output, an audible output, and a haptic output indicating that the wheel assembly has exceeded a selected wheel assembly parameter threshold based on the dynamic response of the wheel speed signal.

A wheel parameter resolving system, apparatus and method are disclosed and described. The wheel parameter resolving system comprises a wheel unit configured to sense radial acceleration in a wheel, the wheel comprising a rim and a tire, the rim having a diameter, and a transmitter configured to transmit a transmit signal indicative of sensed radial acceleration, a controller configured to resolve a rotation parameter indicative of the rim diameter in response to the sensed radial acceleration, and a receiver configured to receive a receive signal based on a transmit signal indicative of sensed radial acceleration, the receiver communicatively coupled to the controller. Resolving the rotation parameter comprises calculating the rotation parameter based on the sensed radial acceleration and a predetermined roll parameter.

A wheel parameter resolving system, apparatus and method are disclosed and described. The wheel parameter resolving system comprises a wheel unit configured to sense radial acceleration in a wheel, the wheel comprising a rim and a tire, the rim having a diameter, and a transmitter configured to transmit a transmit signal indicative of sensed radial acceleration, a controller configured to resolve a rotation parameter indicative of the rim diameter in response to the sensed radial acceleration, and a receiver configured to receive a receive signal based on a transmit signal indicative of sensed radial acceleration, the receiver communicatively coupled to the controller. Resolving the rotation parameter comprises calculating the rotation parameter based on the sensed radial acceleration and a predetermined roll parameter.

The invention relates generally to tire monitoring systems for collecting measured tire parameter data during vehicle operation and, more particularly, to a system and method for estimating tire wear state and inflation pressure based upon such measurements.