Measuring and testing – Tire – tread or roadway – Tire inflation testing installation
Patent
1997-08-25
1999-11-23
Felber, Joseph L.
Measuring and testing
Tire, tread or roadway
Tire inflation testing installation
731464, 340447, B60C 2304
Patent
active
059879807
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a vehicle tire pressure telemetry system, and more particularly to a tire pressure sensing transponder assembly for remote sensing and transmitting apparatus which is easily mounted to a vehicle tire and which will effectively transmit information regarding the pressure in the tire to which it is mounted, to a remote receiver device.
BACKGROUND OF THE INVENTION
A number of systems are known for providing tire pressure information to a driver of a vehicle. Typically, these are binary systems which only provide the driver with information as to whether the tire pressure is above or below a predetermined pressure.
One known system utilises a magnetic coupling across the tire wall between a pressure sensor within the tire and a data processing device outside the tire. This arrangement is awkward to install and can be unreliable.
Typically, such systems transmit the tire pressure information to the driver's cabin via connecting wires. This arrangement is disadvantageous since it is necessary to provide a means for maintaining electrical contact between the wiring outside of the tire, and the pressure sensing device mounted within the tire. Further, the installation of such systems can be expensive and time consuming.
While it would be desirable to use wireless transmitting means, to date there has not been a satisfactory system which is able to be powered effectively and to withstand the relatively harsh environment in and around a vehicle tire, and thus provide reliable and effective transmission of the data to the driver's cabin.
SUMMARY OF THE INVENTION
The present invention concerns the provision of a structural arrangement for a standard tire valve element which obviates the need to modify the tire, rim, wheel or valve stem receptacle, nor any need to remove or dismantle a tire or rim for its installation. Importantly, with the present invention the tire valve's air seal, safety and balance of the wheel and tire are not compromised.
In one aspect the present invention provides a tire valve element assembly comprising a pressure sensing and transponder arrangement, said arrangement being mounted on a short valve element so as to extend axially of the short valve element and being sized to slidably fit within and be removable from a valve stem of a tire whereby the valve element assembly is adapted to be threadedly connected via an electrically conducting receptacle within the stem, so as to be a direct substitution for an existing in situ valve element in the tire valve stem, and wherein the arrangement is in fluid contact with the interior of the tire to sense the pressure within the tire when the short valve element is in situ, characterised in that the arrangement, when in situ, is electrically connected to a conductive portion of the valve element via the receptacle to facilitate an antenna system for radio frequency communication with the arrangement.
In another aspect the present invention provides an assembly of an electronic pressure sensing means mounted on a short valve element of a pneumatic tire so as to, in use, sense pressure within the pressurized space of a tire said sensing means comprising; and connected to the sensing means for transmitting tire pressure information to a remote receiving device; transmitting means; element so as not to interfere with the normal operation of the tire valve such that the longitudinal axis of the housing is generally aligned with the central axis of the tire valve, when in situ, and dimensioned so as to be slidably insertable into a standard valve stem of the tire with the short valve element threadedly connected to an electrically conducting receptacle in the stem and wherein, in use, the housing is located within the pressurized space of the tire such that the assembly is adapted to be a direct substitute for an existing in situ valve element in the tire valve stem; characterized in that portion of the tire valve element that extends outside of the pressure space of the tire and acts as an aerial for
REFERENCES:
patent: 4037192 (1977-07-01), Cowit
patent: 4074227 (1978-02-01), Kalmus
patent: 4308520 (1981-12-01), Darlington
patent: 4686855 (1987-08-01), Smith
patent: 4998092 (1991-03-01), Ohno et al.
Cohen Phillip Albert
Mangafas Nicholas
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