Method and apparatus for locating tires using RFID
First Claim
1. A method for determining the position of four tires on corresponding four wheels in a vehicle, each wheel having an axis of rotation, each tire having an embedded Radio Frequency IDentification RFID) tag, wherein the RFID tags embedded in the four tires have respective identifiers denoted as ID1, ID2, ID3, and ID4, wherein the axis of the four wheels have (X, Y) coordinates with respect to X and Y axes of a rectangular X-Y coordinate system, wherein the X and Y axes form a plane comprising the axes of the four wheels, and wherein the method comprises:
- determining a position P(x, y) to place a reader antenna subject to x<
0 and y>
0, wherein (x, y) denotes the (X, Y) coordinates of position P in the X-Y coordinate system;
placing the reader antenna at the determined position P(x, y);
after said placing and for z=1, 2, 3, and 4, said reader antenna emitting N signals to the RFID tag whose identifier is IDz and measuring a delay Tzn for receiving the signal n (n=1, 2, . . . , N) reflected from the RFID tag whose identifier is IDz, wherein N is at least 2; and
identifying which wheel of the four wheels each tire of the four tires is on according to the measured delay Tzn for z=1, 2, 3, and 4 and n=1, 2, . . . , N,wherein said determining the position P(x, y) comprises maximizing a measure of a separation between the position P(x, y) and the four wheels.
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Abstract
A method and apparatus for determining the position of four tires on corresponding four wheels in a vehicle. Each wheel has an axis of rotation. Each tire has an embedded Radio Frequency IDentification (RFID) tag. The RFID tags embedded in the four tires have respective identifiers denoted as ID1, ID2, ID3, and ID4. A position to place a reader antenna is determined and the reader antenna is subsequently placed in the determined position. The reader antenna in the determined position emitting N signals to the respective RFID tag in the four tires. A delay is measured for receiving each signal reflected from the RFID tags. Which wheel of the four wheels each tire is on is identified according to the measured delays.
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Citations
18 Claims
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1. A method for determining the position of four tires on corresponding four wheels in a vehicle, each wheel having an axis of rotation, each tire having an embedded Radio Frequency IDentification RFID) tag, wherein the RFID tags embedded in the four tires have respective identifiers denoted as ID1, ID2, ID3, and ID4, wherein the axis of the four wheels have (X, Y) coordinates with respect to X and Y axes of a rectangular X-Y coordinate system, wherein the X and Y axes form a plane comprising the axes of the four wheels, and wherein the method comprises:
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determining a position P(x, y) to place a reader antenna subject to x<
0 and y>
0, wherein (x, y) denotes the (X, Y) coordinates of position P in the X-Y coordinate system;placing the reader antenna at the determined position P(x, y); after said placing and for z=1, 2, 3, and 4, said reader antenna emitting N signals to the RFID tag whose identifier is IDz and measuring a delay Tzn for receiving the signal n (n=1, 2, . . . , N) reflected from the RFID tag whose identifier is IDz, wherein N is at least 2; and identifying which wheel of the four wheels each tire of the four tires is on according to the measured delay Tzn for z=1, 2, 3, and 4 and n=1, 2, . . . , N, wherein said determining the position P(x, y) comprises maximizing a measure of a separation between the position P(x, y) and the four wheels. - View Dependent Claims (2, 5, 6, 7, 8, 9)
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3. A method for determining the position of four tires on corresponding four wheels in a vehicle, each wheel having an axis of rotation, each tire having an embedded Radio Frequency IDentification (RFID) tag, wherein the RFID tags embedded in the four tires have respective identifiers denoted as ID1, ID2, ID3, and ID4, wherein the axis of the four wheels have (X, Y) coordinates with respect to X and Y axes of a rectangular X-Y coordinate system, wherein the X and Y axes form a plane comprising the axes of the four wheels, and wherein the method comprises:
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determining a position P(x, y) to place a reader antenna subject to x<
0 and y>
0, wherein (x, y) denotes the (X, Y) coordinates of position P in the X-Y coordinate system;placing the reader antenna at the determined position P(x, y); after said placing and for z=1, 2, 3, and 4, said reader antenna emitting N signals to the RFID tag whose identifier is IDz and measuring a delay Tzn for receiving the signal n (n=1, 2, . . . , N) reflected from the RFID tag whose identifier is IDz, wherein N is at least 2; and identifying which wheel of the four wheels each tire of the four tires is on according to the measured delay Tzn for z=1, 2, 3, and 4 and n=1, 2, . . . , N, wherein said identifying comprises determining Tz as a minimum of Tzn (n=1, 2, . . . , N) such that Ta<
Tb<
Tc<
Td, andwherein a, b, c, and d are each 1, 2, 3, or 4 and differ from one another. - View Dependent Claims (4)
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10. An apparatus for determining the position of four tires on corresponding four wheels in a vehicle, each wheel having an axis of rotation, each tire having an embedded Radio Frequency IDentification (RFID) tag, wherein the RFID tags embedded in the four tires have respective identifiers denoted as ID1, ID2, ID3, and ID4, wherein the axis of the four wheels have (X, Y) coordinates with respect to X and Y axes of a rectangular X-Y coordinate system, wherein the X and Y axes form a plane comprising the axes of the four wheels, and wherein the apparatus comprises:
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means for determining a position P(x, y) to place a reader antenna subject to x<
0 and y>
0, wherein (x, y) denotes the (X, Y) coordinates of position P in the X-Y coordinate system;means for measuring a delay Tzn for receiving signal n (n=1, 2, . . . , N) reflected from the RFID tag whose identifier is IDz for z=1, 2, 3, and 4 after the reader antenna has been placed at the determined position P(x, y) and has emitted N signals to the RFID tag whose identifier is IDz, wherein N is at least 2; and means for identifying which wheel of the four wheels each tire of the four tires is on according to the measured delay Tzn for z=1, 2, 3, and 4 and n=1, 2, . . . , N, wherein said means for determining the position P(x, y) comprises maximizing a measure of a separation between the position P(x, y) and the four wheels. - View Dependent Claims (11)
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12. An apparatus for determining the position of four tires on corresponding four wheels in a vehicle, each wheel having an axis of rotation, each tire having an embedded Radio Frequency IDentification (RFID) tag, wherein the RFID tags embedded in the four tires have respective identifiers denoted as ID1, ID2, ID3, and ID4, wherein the axis of the four wheels have (X, Y) coordinates with respect to X and Y axes of a rectangular X-Y coordinate system, wherein the X and Y axes form a plane comprising the axes of the four wheels, and wherein the apparatus comprises:
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means for determining a position P(x, y) to place a reader antenna subject to x<
0 and y>
0, wherein (x, y) denotes the (X, Y) coordinates of position P in the X-Y coordinate system;means for measuring a delay Tzn for receiving signal n (n=1, 2, . . . , N) reflected from the RFID tag whose identifier is IDz for z=1, 2, 3, and 4 after the reader antenna has been placed at the determined position P(x, y) and has emitted N signals to the RFID tag whose identifier is IDz, wherein N is at least 2; and means for identifying which wheel of the four wheels each tire of the four tires is on according to the measured delay Tzn for z=1, 2, 3, and 4 and n=1, 2, . . . , N, wherein said means for identifying comprises means for determining Tz as a minimum of Tzn (n=1, 2, . . . , N) such that Ta<
Tb<
Tc<
Td, and wherein a, b, c, and d are each 1, 2, 3, or 4 and differ from one another. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification