Method and device for localizing transponders
First Claim
1. A device for localizing transponders, comprising:
- a first transponder disposed at a first position in an object and configured to provide a first response signal in response to a request signal;
a second transponder disposed at a second position, different from the first position, in the object and configured to provide a second response signal in response to the request signal; and
a base station having;
a transmit/receive device for transmitting a request signal to said first and second transponders and for receiving the first and second response signals from said first and second transponders, respectively;
an evaluation device for evaluating the first and second response signal, for comparing field strength information associated with the evaluated response signals to one another, and for determining a distance from the base station to said first and second transponders based on the comparison of the evaluated response signal;
said first transponder assigned to a first tire mounted on an axle, and said second transponder assigned to a second tire mounted on the axle.
1 Assignment
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Accused Products
Abstract
The device and the method enable the localization of transponders, particularly in motor vehicles. A determination of the distance of different transponders from the base station is made possible by evaluating the different request signals and response signals received and also the physical variables contained therein, such as signal level, charging time, and signal propagation delay. As a result of the relative determination of the different distances of the transponders from a base station, it is for example possible to determine the position of wheels of a motor vehicle. This means savings in terms of tire electronics, which require a separate power supply and are technically more complicated and more expensive to use than transponders.
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Citations
19 Claims
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1. A device for localizing transponders, comprising:
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a first transponder disposed at a first position in an object and configured to provide a first response signal in response to a request signal; a second transponder disposed at a second position, different from the first position, in the object and configured to provide a second response signal in response to the request signal; and a base station having; a transmit/receive device for transmitting a request signal to said first and second transponders and for receiving the first and second response signals from said first and second transponders, respectively; an evaluation device for evaluating the first and second response signal, for comparing field strength information associated with the evaluated response signals to one another, and for determining a distance from the base station to said first and second transponders based on the comparison of the evaluated response signal; said first transponder assigned to a first tire mounted on an axle, and said second transponder assigned to a second tire mounted on the axle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of localizing transponders disposed at mutually different locations in an object, which comprises the following steps:
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(a) sending of a request signal from a base station; (b) responding with at least one first response signal by at least one first transponder in response to the request signal; (c) responding with at least one second response signal by at least one second transponder, disposed at a different location from the first responder, in response to the request signal; (d) receiving and evaluating the at least two response signals received by the base station; and (e) comparing field strength information associated with the first and second response signals with one another and determining a distance of the transponders from the base station based on the comparison; wherein the first transponder is assigned to a first tire mounted on an axle, and the second transponder is assigned to a second tire mounted on the axle. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A device for localizing transponders, comprising:
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a first transponder disposed at a first position in an object and configured to provide a first response signal in response to a request signal; a second transponder disposed at a second position, different from the first position, in the object and configured to provide a second response signal in response to the request signal; and a base station having; a transmit/receive device for transmitting a request signal to said first and second transponders and for receiving the first and second response signals from said first and second transponders, respectively; an evaluation device for evaluating the first and second response signal, for comparing the evaluated response signals to one another, and for determining a distance from the base station to said first and second transponders based on the comparison of the evaluated response signal; wherein at least one of said transponders includes at least one further measuring device for measuring a period of time from when said base station starts supplying power to said transponder until a predefined charging limit is reached, and a transmit device for sending back a value for the measured time period as a response signal or as part of the response signal to said base station.
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Specification