Measuring system for wheel parameters and measuring detector for such a system
First Claim
1. Measuring system for measuring at least one parameter that is indicative of a state of a tire of a vehicle, comprising:
- on each wheel, a detector having a parameter sensor and a detector antenna tuned to a defined frequency, a central data processing unit coupled by individual wire links to fixed antennas, each of the fixed antennas having an associated wheel and each of the fixed antennas being arranged near its associated wheel, the parameter sensor comprising a transponder with a capacitor for storing power, the power being transmitted to the parameter sensor of the detector from an associated fixed antenna, at least one of the associated fixed antenna and the detector antenna being a loop that is substantially centered over an axis of the associated wheel so that a communication link with the other one of the associated fixed antenna and the detector antenna corresponding to the associated wheel is substantially independent of an angular position of the associated wheel, and the detector antenna being insulated from a rim of the associated wheel when the wheel rim is made of metal, the associated wheel also carrying at least one of lateral, vertical and longitudinal acceleration measuring means, each of which is connected to the detector antenna.
2 Assignments
0 Petitions
Accused Products
Abstract
Measuring system for measuring at least one parameter indicative of the state of the tires of a vehicle, which comprises on each wheel a detector (12) having a parameter sensor (13) and an antenna (15) tuned to a defined frequency, and which comprises a central data processing unit (24) coupled by individual wire links (22) to fixed antennas that are installed near the wheels equipped with sensors. Each parameter sensor comprises a transponder associated with a capacitor to store the power from the associated fixed antenna. At least one of the fixed and mobile antennas is configured in such a way that the link with the other antenna corresponding to the same wheel is substantially independent of the angular position of the wheel.
58 Citations
26 Claims
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1. Measuring system for measuring at least one parameter that is indicative of a state of a tire of a vehicle, comprising:
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on each wheel, a detector having a parameter sensor and a detector antenna tuned to a defined frequency, a central data processing unit coupled by individual wire links to fixed antennas, each of the fixed antennas having an associated wheel and each of the fixed antennas being arranged near its associated wheel, the parameter sensor comprising a transponder with a capacitor for storing power, the power being transmitted to the parameter sensor of the detector from an associated fixed antenna, at least one of the associated fixed antenna and the detector antenna being a loop that is substantially centered over an axis of the associated wheel so that a communication link with the other one of the associated fixed antenna and the detector antenna corresponding to the associated wheel is substantially independent of an angular position of the associated wheel, and the detector antenna being insulated from a rim of the associated wheel when the wheel rim is made of metal, the associated wheel also carrying at least one of lateral, vertical and longitudinal acceleration measuring means, each of which is connected to the detector antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. Measuring system for measuring at least one parameter that is indicative of a state of a tire mounted on a wheel of a vehicle, comprising:
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a detector having a parameter sensor and a detector antenna tuned to a defined frequency, the detector being mounted to a rim of the wheel and the detector antenna extending circumferentially around the wheel rim and contacting the wheel rim, the parameter sensor comprising a transponder for transmitting signals indicative of the sensed parameter via the detector antenna;
a central data processing unit mounted on the vehicle for receiving the transmitted signals and for, in response to receiving the transmitted signals, providing indications of the sensed parameter; and
a fixed antenna coupled by a wire link to the central data processing unit, the fixed antenna being arranged near the wheel, power for operating the detector being transferred from the fixed antenna to the parameter sensor through the detector antenna, the parameter sensor having a capacitor for storing power received from the fixed antenna until use, the wheel rim being made of one of a non-conductive material and a weakly conductive material. - View Dependent Claims (15, 16, 17, 18, 19)
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20. Measuring system for measuring pressure within a tire mounted on a wheel of a vehicle, comprising:
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an annular support mounted on the wheel within the tire for enabling operation of the wheel when the tire is flat;
detector having a parameter sensor and a detector antenna tuned to a defined frequency, the detector being secured to the annular support at a location spaced away from the wheel, the parameter sensor sensing air pressure within the tire and a transponder of the detector transmitting pressure signals having an air pressure value portion that indicates the sensed air pressure within the tire; and
central data processing unit mounted on the vehicle and coupled to a fixed antenna for receiving the transmitted pressure signals and for providing indications of the sensed air pressure wherein the fixed antenna is associated with the wheel and is arranged on the vehicle near the wheel, power for operating the detector being transferred from the fixed antenna to the parameter sensor through the detector antenna, the parameter sensor having a capacitor for storing power received from the fixed antenna until use. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification