Abstract:
A system for determining interaction between a tire and a contact surface during movement of a motor vehicle includes at least one first sensor and processing means. The at least one first sensor includes one or more first elongated piezoelectric elements which extend along at least a first portion of the tire. The at least one first sensor supplies a first signal to the processing means. The first signal is generated by rotation of the tire and is generated cyclically with each revolution of the tire. The processing means detects variations in time intervals between distinctive elements of the first signal. A tire including the system, a kit for detecting behaviour of a tire moving with respect to a contact surface, a method for monitoring events correlated with interactions between tires of a moving vehicle and a contact surface, and related systems, tires, methods, and vehicles are also disclosed.
Abstract:
A system for generating electrical energy in a tire for a vehicle includes at least one piezoelectric element that generates electrical energy when deformed. The at least one piezoelectric element is associated with the tire and is elongate. The at least one piezoelectric element extends along at least a portion of the tire and is electrically connected to an electrical circuit. The electrical circuit is not in electrical communication with the vehicle. The tire is mounted on a rim of the vehicle. An associated tire is also disclosed.
Abstract:
Method for vulcanizing a tire by predetermining a degree of vulcanization, comprising the steps of determining specified structural and dimensional parameters of the tire and of a vulcanization mould, determining the change over a time (t) of specified thermodynamic parameters of the tire, of the mould, of heat-supply fluids and of a cooling fluid, determining a parameter consisting of an equivalent vulcanization time t0, and determining an equivalent degree of vulcanization X(t0) at specified points within the tire by means of an equivalent isothermal rheometric curve at a reference temperature T0, comprising three consecutive sections having the following equations: X ( t o ) = { k t o n 1 + k t o n k x t o n x 1 + k x t o n x + f ( t o - t xx ) 1 - C k R ( t o - t 100 ) n R 1 + k R ( t o - t 100 ) n R
Abstract:
In a vulcanization mold (2) for vehicle tires the rubber blend deposits are cleaned off by the action of one or more laser beams (9) supplied in the form of short-duration and high-energy pulses, which beams cause separation of the rubber blend by effect of the shock wave generated by them and hitting the operating surfaces of the mold (2). Each laser beam (9) is guided by a scanning unit (21a, 21b) mounted on a rotating column (16) for distributing the beam action over the whole circumferential extension of the mold.
Abstract:
A tire includes a flexible piezoelectric element associated with an energy storage device (e.g. a capacitor). The flexible piezoelectric element is mounted in cantilever-beam fashion within a housing so that a first end thereof is fixed to the housing. A loading mass is associated with the second end of the flexible piezoelectric element. A small gap is formed between the inner walls of the housing and the outer surface of the loading mass in order to allow limited flexure of the piezoelectric element. The housing, including the piezoelectric element, is mounted in a crown portion of the tire, preferably on the inner surface of the tire. The piezoelectric element flexes under the action of the longitudinal acceleration when the tire rotates. Sufficient electrical power for powering an electronic device included within the tire is obtained, together with a long durability of the piezoelectric element.
Abstract:
A method for determining a load exerted on a tyre fitted on a vehicle during a running of said vehicle comprises the following steps: acquiring a first signal comprising a first portion representative of a radial deformation to which a first tread area portion of said tyre is subjected during passage of said first tread area portion in a contact region between said tyre and a rolling surface; measuring an amplitude of said radial deformation in said first signal portion; estimating a rotation speed and an inflation pressure of said tyre in correspondence of said radial deformation; deriving said tyre load from said amplitude, said rotation speed and said inflation pressure.
Abstract:
A method of signalling an aquaplaning condition of a tyre, the latter rolling on a rolling surface, a footprint area being defined between the tyre and the rolling surface, a layer of water being interposed between the tyre and the rolling surface, includes: detecting a first signal representative of a deformation of the tyre due to rolling of the tyre on the rolling surface, the first signal including at least one portion representative of the interaction between the tyre and the layer of water; processing the first signal so as to determine a parameter representative of an aquaplaning condition of the tyre as a function of the first signal; and generating a notification signal as a function of the at least one parameter. A system for signalling an aquaplaning condition of a tyre.
Abstract:
Fastened to a tire is a detecting device consisting of a detecting unit including an antenna operatively connected to a sensor unit and a power supply unit including a piezoelectric element mounted in a housing. The piezoelectric element is disposed within the housing so as to have a first end substantially fixed to the housing and a second end associated with a loading mass, a gap being formed between at least one inner wall of the housing and an outer surface of the loading mass. The piezoelectric element is positioned substantially along a plane orthogonal to a radial direction of the tire. An anchoring body has a base portion with a fastening surface secured to the radially internal surface of the tire. The detecting unit is brought into engagement with the anchoring body by insertion of the inner perimetral edge of the antenna into a perimetral groove formed between the base portion and a retaining portion.
Abstract:
Fastened to a tire is a detecting device consisting of a detecting unit including a sensor associated with an annular antenna having an inner perimetral edge, and an anchoring body having a base portion with a fastening surface secured to the radially internal surface of the tire. The detecting unit is removably brought into engagement with the anchoring body by insertion of the inner perimetral edge of the antenna into a perimetral groove formed between the base portion and a retaining portion. The anchoring body has an overall height of about 0.2 to about 1.5 times a maximum distance measure between two mutually spaced apart points along the inner perimetral edge.
Abstract:
A tire having an internal surface of substantially toroidal conformation, includes an electronic device including an electronic unit and an antenna, the latter being connected with the electronic unit and having an inner perimetral edge, and an anchoring body mounted on the internal surface for engagement between the electronic device and the tire, the anchoring body including at least two portions, said electronic unit being arranged between the portions. Each of the portions has a fastening surface secured to the internal surface of the tire and a groove in which the inner perimetral edge of the antenna is fitted to maintain a constraint between the electronic unit and the anchoring body. Also disclosed is a method of installing an electronic unit into a tire.