Cross-correlation method for identification and removal of machine contribution from tire uniformity measurements
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01M-017/02
B24B-049/00
출원번호
US-0137265
(2002-05-02)
발명자
/ 주소
Shteinhauz, Gregory David
Luk, Yiu Wah
출원인 / 주소
The Goodyear Tire & Rubber Company
대리인 / 주소
Cohn, Howard M.
인용정보
피인용 횟수 :
2인용 특허 :
8
초록▼
Method to identify and remove machine contributions from tire uniformity measurements made on a tire uniformity machine by synchronizing and averaging together multiple measurements of tire uniformity made on a single test tire that is re-mounted between measurements in a randomly determined orienta
Method to identify and remove machine contributions from tire uniformity measurements made on a tire uniformity machine by synchronizing and averaging together multiple measurements of tire uniformity made on a single test tire that is re-mounted between measurements in a randomly determined orientation relative to a rim reference mark on the rim of the tire uniformity machine. A cross-correlation function is calculated for each measurement relative to the first measurement, and an angular shift is determined from each cross-correlation function. The angular shifts are used to synchronize the measurements so that they can be averaged together. The resulting average test tire uniformity data has both machine contribution and random measurement noise minimized. An average machine contribution data set is determined by synchronizing and subtracting the average test tire uniformity data from each test tire uniformity measurement data set, then averaging together the resulting data sets. Corrected production tire uniformity data is obtained from a single measurement of production tire uniformity by subtracting the average machine contribution data from the production tire uniformity measurement data.
대표청구항▼
Method to identify and remove machine contributions from tire uniformity measurements made on a tire uniformity machine by synchronizing and averaging together multiple measurements of tire uniformity made on a single test tire that is re-mounted between measurements in a randomly determined orienta
Method to identify and remove machine contributions from tire uniformity measurements made on a tire uniformity machine by synchronizing and averaging together multiple measurements of tire uniformity made on a single test tire that is re-mounted between measurements in a randomly determined orientation relative to a rim reference mark on the rim of the tire uniformity machine. A cross-correlation function is calculated for each measurement relative to the first measurement, and an angular shift is determined from each cross-correlation function. The angular shifts are used to synchronize the measurements so that they can be averaged together. The resulting average test tire uniformity data has both machine contribution and random measurement noise minimized. An average machine contribution data set is determined by synchronizing and subtracting the average test tire uniformity data from each test tire uniformity measurement data set, then averaging together the resulting data sets. Corrected production tire uniformity data is obtained from a single measurement of production tire uniformity by subtracting the average machine contribution data from the production tire uniformity measurement data. the level of reception signals from the reception antennas and the data that represents the pattern signal, which is included in the radio signal transmitted by the transmitter device. 2. The apparatus as set forth in claim 1, wherein the receiver further includes a switch circuit that selectively connects the front reception antenna or the rear reception antenna to the controller. 3. The apparatus as set forth in claim 1, wherein each signal generator generates a first pattern signal when the corresponding tire rotates in one direction, and each signal generator generates a second pattern signal, which is different from the first pattern signal, when the tire rotates in the other direction. 4. The apparatus as set forth in claim 3, wherein the signal generators that correspond to the left front and rear tires generate the first pattern signals and the signal generators that correspond to the right front and rear tires generate the second pattern signals if the vehicle moves forward, and the signal generators that correspond to the left front and rear tires generate the second pattern signals and the signal generators that correspond to the right front and rear tires generate the first pattern signals if the vehicle moves rearward. 5. The apparatus as set forth in claim 3, wherein each signal generator includes: a case, in which an annular passage is formed; and a movable body, which is located in the annular passage, wherein the movable body moves in the annular passage circumferentially in the case when the corresponding tire rotates, and the direction in which the movable body moves changes in accordance with the direction in which the tire rotates. 6. The apparatus as set forth in claim 5, wherein each signal generator generates the first pattern signal when the movable body moves in one direction and generates the second pattern signal when the movable body moves in the other direction. 7. The apparatus as set forth in claim 5, wherein the movable body is formed of a conductive material, and each signal generator further includes a pair of annular electrode plates, which are located in the annular passage and are electrically connected to each other through the movable body, and at least one electrode plate includes a plurality of non-conductive portions, each of which is circumferentially spaced from the adjacent non-conductive portion, by a predetermined interval, and the electrode plates are not electrically connected to each other when the movable body is located at a position corresponding to one of the non-conductive portions. 8. The apparatus as set forth in claim 7, wherein the non-conductive portions are cut-away portions formed in one electrode plate, and the cut-away portions divide the electrode plate into a plurality of sections, and the sections have different circumferential dimensions. 9. The apparatus as set forth in claim 1, wherein the controller determines which transmitter device has transmitted the radio signal in accordance with the direction of movement of the vehicle. 10. The apparatus as set forth in claim 1, wherein the controller first determines whether the front or the rear tires correspond to the reception antenna that generates the highest level signal, and the controller subsequently determines which of the transmitter devices of the determined tires has transmitted the radio signal, in accordance with the data that represents the pattern signal, which is included in the radio signal transmitted by the transmitter device. 11. A tire condition monitoring apparatus for monitoring the condition of a plurality of tires attached to a vehicle, wherein the tires include left and right front tires and left and right rear tires, the apparatus comprising: a transmitter device, which is attached to each tire, wherein the transmitter device includes: a condition detecting means for detecting the condition of the corresponding tire; a signal generating means for generating a specific patt ern signal when the tire rotates, wherein the pattern signal generated by the signal generating means of the transmitter device attached to each left tire is different from the pattern signal generated by the signal generating means of the transmitter device attached to each right tire when the vehicle moves in a given direction; and a transmitting means for transmitting a radio signal, the radio signal including data that represents the tire condition and data that represents the pattern signal; a front reception antenna, which is installed in a body of the vehicle at a position that is relatively near to the left and right front tires, wherein the front reception antenna receives radio signals that are relatively strong from the transmitter devices of the left and right front tires; a rear reception antenna, which is installed in the vehicle body at a position that is relatively near to the left and right rear tires, wherein the rear reception antenna receives radio signals that are relatively strong from the transmitter devices of the left and right rear tires; a control means for receiving reception signals from the front reception antenna and the rear reception antenna; and a switch means for selectively connecting the front reception antenna or the rear reception antenna to the control means, wherein, when one of the transmitter devices has transmitted a radio signal, the control means determines which transmitter device has transmitted the radio signal in accordance with the level of reception signals from the reception antennas and the data that represents the pattern signal, which is included in the radio signal transmitted by the transmitter device. 12. The apparatus as set forth in claim 11, wherein each signal generating means includes: a case, in which an annular passage is formed; and a movable body, which is located in the annular passage, wherein the movable body rolls in the annular passage circumferentially in the case when the corresponding tire rotates, and the direction in which the movable body rolls changes in accordance with the direction in which the tire rotates. 13. The apparatus as set forth in claim 12, wherein each signal generating means generates a first pattern signal when the movable body rolls in one direction and generates a second pattern signal, which is different from the first pattern signal, when the movable body rolls in the other direction. 14. The apparatus as set forth in claim 12, wherein the movable body is formed of a conductive material, and each signal generating means further includes a pair of annular electrode plates, which are located in the annular passage and are electrically connected to each other through the movable body, and at least one electrode plate includes a plurality of non-conductive portions, each of which is circumferentially spaced from the adjacent non-conductive portion, by a predetermined interval, and the electrode plates are not electrically connected to each other when the movable body is located at a position corresponding to one of the non-conductive portions. 15. The apparatus as set forth in claim 14, wherein the non-conductive portions are cut-away portions formed in one electrode plate, and the cut-away portions divide the electrode plate into a plurality of sections, and the sections have different circumferential dimensions. 16. The apparatus as set forth in claim 11, wherein the control means determines which transmitter device has transmitted the radio signal in accordance with the direction of movement of the vehicle. 17. The apparatus as set forth in claim 11, wherein the control means first determines whether the front or the rear tires correspond to the reception antenna that generates the highest level signal, and the control means subsequently determines which of the transmitter devices of the determined tires has transmitted the radio signal, in accordance with the data that represents the pattern signal, which is includ
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이 특허에 인용된 특허 (8)
Fukasawa Katsushi,JPX, Method and apparatus for predicting a higher-order component of high speed uniformity of a tire, and method of manufacturing tires.
Dunn William Frank ; Maloney John Michael ; Lipczynski George Jeffrey, Method of correcting the imbalance of a pneumatic tire with a tire uniformity machine.
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