Abstract:
The distribution of a specific pressure in the ground-contacting area of a tire (4) under examination is detected by means of a plurality of sensing cells (7) distributed on a plate-like support (8) applied to a rest surface (2) acted upon by the tire through its rolling surface (5). Each sensing cell (7) sends an electric signal correlated with the specific pressure applied thereto to a processing unit (10) through which the processed signals are sent to a display device (12) graphically representing the distribution of the specific pressure in the ground-contacting area. By causing the tire (4) to roll on the rest surface (2) and therefore the sensing cells (7), the dynamic variation of the specific pressures in the ground-contacting area can be detected. A protection sheet (11) interposed between the rolling surface of the tire (4) and the sensing cells (7) protects the latter against risks of damages due to tangential shearing stresses produced at the ground-contacting area.
Abstract:
A method for determining a load exerted on a tire, fitted on a vehicle, during running of the vehicle on a rolling surface, is disclosed. The method includes acquiring a first signal comprising a first signal portion representative of a radial deformation; measuring an amplitude of the radial deformation in the first signal portion; estimating a rotation speed of the tire corresponding to the radial deformation; estimating an inflation pressure of the tire corresponding to the radial deformation; and deriving the load exerted on the tire from the amplitude, the rotation speed, and the inflation pressure. The first signal portion is representative of the radial deformation to which a first tread area portion of the tire is subjected during passage of the first tread area portion through a contact region between the tire and the rolling surface. A system for determining the load exerted on the tire is also disclosed.
Abstract:
An oscillating structure is coupled to a crown portion of a tire. The oscillating structure includes a housing and a piezoelectric element coupled to the housing. The piezoelectric element is able to oscillate in an oscillation direction, which could match either a longitudinal or a radial direction of the tire. An electrical signal generated by the piezoelectric element is processed so as to determine at least one operating parameter of the tire. The processing includes determining whether a rotation speed of the tire is greater than a threshold speed; and, in the negative, extracting information for determining the at least one operating parameter of the tire from a low-pass filtered signal. Such low-pass filtered signal is obtained by removing at least frequency components of the electrical signal having a frequency higher than or equal to a resonance peak frequency of the oscillating structure.
Abstract:
A method of determining at least one parameter representative of at least one interaction along a longitudinal direction between a tyre and the ground, includes identifying a first parameter representative of a radial deformation of the tyre; determining a first and a second value of the first parameter in respective neighbourhoods of a first and a second longitudinal end of a footprint area defined between the tyre and ground; calculating a linear combination of the values thereby obtaining a second parameter; determining a third parameter representative of an angular velocity of the tyre; calculating a ratio between the second and third parameters; and calculating a main parameter, starting from the ratio, according to an algorithm, which main parameter is representative of a longitudinal interaction between the tyre and the ground.
Abstract:
A method for wear control of vehicle tyres, includes: detecting deformation of an inner surface of a first tyre by means of a first sensor; determining a first level of wear of the first tyre; detecting a deformation of an inner surface of a second tyre by means of a second sensor; determining a second level of wear of the second tyre; comparing the first and second levels of wear with each other; and generating a notification signal representative of the comparison. Also disclosed is a system for wear control of vehicle tyres, a method of determining the wear of a tyre and a system for determining the wear of a tyre.
Abstract:
A method for determining a load exerted on a tire, fitted on a vehicle, during running of the vehicle on a rolling surface, is disclosed. The method includes acquiring a first signal comprising a first signal portion representative of a radial deformation; measuring an amplitude of the radial deformation in the first signal portion; estimating a rotation speed of the tire corresponding to the radial deformation; estimating an inflation pressure of the tire corresponding to the radial deformation; and deriving the load exerted on the tire from the amplitude, the rotation speed, and the inflation pressure. The first signal portion is representative of the radial deformation to which a first tread area portion of the tire is subjected during passage of the first tread area portion through a contact region between the tire and the rolling surface. A system for determining the load exerted on the tire is also disclosed.
Abstract:
A wheel for vehicles includes a rim, a tyre mounted on the rim, and at least one device for energy generation operatively associated with the tyre. The device for energy generation includes a first element that is fixed relative to the rim or to the tyre, and a second element mounted on the first element and free to rotate relative to the first element around a predetermined rotation axis. The second element has a mass centre eccentric to the predetermined rotation axis. The device for energy generation further includes an electric generator having a stator mounted on the first element and a rotor mounted on the second element.
Abstract:
A method for monitoring a tyre during running includes acquiring and storing, at least temporarily, a first curve representing an acceleration profile of a first point of a tread area of the tyre; acquiring and storing, at least temporarily, at least one second curve representing an acceleration profile of a second point of the tread area; and comparing the first curve and the at least one second curve, or parameters derived from the first curve and the at least one second curve, so as to determine a dynamic behavior of the tyre. The first and second points are located substantially on a same meridian plane of the tyre. A related tyre, wheel for a vehicle, system for monitoring a tyre during running, and method for controlling a vehicle are also disclosed.
Abstract:
A method for monitoring a tire during running includes acquiring and storing, at least temporarily, a first curve representing an acceleration profile of a first point of a tread area of the tire; acquiring and storing, at least temporarily, at least one second curve representing an acceleration profile of a second point of the tread area; and comparing the first curve and the at least one second curve, or parameters derived from the first curve and the at least one second curve, so as to determine a dynamic behavior of the tire. The first and second points are located substantially on a same meridian plane of the tire. A related tire, wheel for a vehicle, system for monitoring a tire during running, and method for controlling a vehicle are also disclosed.
Abstract:
A method for determining the roughness of a tyre rolling surface by the steps of providing a first signal representative of the motion of at least one point of the tyre during rolling of the surface and processing the first signal for providing an output indicative of the roughness of the rolling surface of the tyre.