Device for monitoring a vehicle wheel

Abstract

A device (1) for monitoring the tyre of a wheel of a vehicle is configured for detecting and transmitting to a receiver, through a wireless connection, information regarding at least one characteristic quantity of the state of the tyre, in particular its inflating pressure. The monitoring device (1) has a body (2, 3) for housing a circuit (16-18) designed to transmit the aforesaid information to the receiver at at least one substantially predetermined radiofrequency. The body (2, 3) is prearranged for being fixed to the rim of the wheel in a position external to the tyre and so as to face at least partly towards the outside of the rim. The body (2, 3) comprises a first body part (2), made of a first material, and a second body part (3) made of a second material, the first and second body parts (2, 3) defining between them a housing (4) for the circuit (16-18). At least the second material is a synthetic material having an electrical permittivity that is substantially constant at said at least one predetermined frequency. Preferably the first and second body parts (2, 3) are rigid and are fixed together by clinching or local mechanical deformation of the first body part (2) on the second body part (3). The synthetic material is preferably a polyphthalamide or PPA based resin.

Description

technical field [0001] The invention relates to a device for monitoring the wheels of a vehicle. More particularly, the invention relates to a device of the above-mentioned kind, designed to detect one or more characteristic quantities that can be used to check a tire, such as its pressure, and to transmit numerical information. Even more particularly, the invention relates to a device of the aforementioned type mounted on the wheel of a vehicle and transmitting said information by radio to a receiver system, for example mounted on the body of the vehicle or in its passenger compartment . [0002] The object of the invention is to ensure a highly reliable operation of the monitoring device in a simple and inexpensive manner. Background technique [0003] Devices for monitoring the tires of a vehicle wheel are known and are usually designated by the abbreviation "TPMS" (Tire Pressure Monitoring System). The above-mentioned devices generally comprise a circuit arrangement ...

AI Technical Summary

Problems solved by technology

[0006] In known solutions, the quality of the transmission of information is affected by the rubber forming the tire and / or the metal parts located in the area of ​​installation which belong to the rim or to the reinforcing structure of the tire; as a consequence the communication distances are generally short , and delivery can be affected due to disturbances

Other problems in the prior art are related to the fact that, over time, the integrity of the device fails due to continuous stress due to the use of the vehicle, such as vibration

And known technical solutions are usually relatively complex and expensive

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