TIRE POSITION DETERMINATION SYSTEM
First Claim
1. A tire position determination system comprising:
- tire pressure transmitters respectively arranged in tires, each tire pressure transmitter being capable of transmitting a first radio wave that includes pressure data and a tire ID of a corresponding tire and a second radio wave indicating that the tire pressure transmitter has reached a specific position on a tire rotation path of the corresponding tire;
a receiver arranged on a vehicle and capable of receiving the first radio wave and the second radio wave from each of the tire pressure transmitters;
axle rotation detectors respectively arranged on axles, each axle rotation detector being capable of detecting rotation of a corresponding axle to output axle rotation information; and
a controller configured to monitor pressure of each tire based on the first radio wave received by the receiver, wherein the controller includes;
a position determination unit configured to determine a tire position by receiving the second radio wave with the receiver from each tire pressure transmitter to obtain a plurality of sets of the axle rotation information corresponding to the specific position for each tire pressure transmitter and specifying a tire that rotates in synchronism with the axle rotation information of each axle to associate the tire ID of each tire with one of the axles;
a cycle calculator configured to calculate a rotation cycle of each axle based on the axle rotation information of each axle; and
a validity determination unit configured to determine validity of accuracy of gravity sampling based on the rotation cycle of each axle, a gravity sampling interval time that indicates a sampling interval of a gravitational component acting on each tire pressure transmitter, and a gravity sampling frequency in the rotation cycle of each axle,wherein the position determination unit is configured to determine the tire position based on a determination result produced by the validity determination unit.
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Accused Products
Abstract
A tire position determination system includes a position determination unit that determines a tire position by obtaining axle rotation information when each of tire pressure transmitters reaches a specific position on a tire rotation path of a corresponding tire and specifying a tire that rotates in synchronism with the axle rotation information of each axle. A cycle calculator calculates a rotation cycle of each axle based on the axle rotation information. A validity determination unit determines validity of accuracy of gravity sampling based on the rotation cycle, a gravity sampling interval time of a gravitational component acting on each tire pressure transmitter, and a gravity sampling frequency in the rotation cycle. The position determination unit determines the tire position based on a determination result of the validity determination unit.
14 Citations
7 Claims
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1. A tire position determination system comprising:
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tire pressure transmitters respectively arranged in tires, each tire pressure transmitter being capable of transmitting a first radio wave that includes pressure data and a tire ID of a corresponding tire and a second radio wave indicating that the tire pressure transmitter has reached a specific position on a tire rotation path of the corresponding tire; a receiver arranged on a vehicle and capable of receiving the first radio wave and the second radio wave from each of the tire pressure transmitters; axle rotation detectors respectively arranged on axles, each axle rotation detector being capable of detecting rotation of a corresponding axle to output axle rotation information; and a controller configured to monitor pressure of each tire based on the first radio wave received by the receiver, wherein the controller includes; a position determination unit configured to determine a tire position by receiving the second radio wave with the receiver from each tire pressure transmitter to obtain a plurality of sets of the axle rotation information corresponding to the specific position for each tire pressure transmitter and specifying a tire that rotates in synchronism with the axle rotation information of each axle to associate the tire ID of each tire with one of the axles; a cycle calculator configured to calculate a rotation cycle of each axle based on the axle rotation information of each axle; and a validity determination unit configured to determine validity of accuracy of gravity sampling based on the rotation cycle of each axle, a gravity sampling interval time that indicates a sampling interval of a gravitational component acting on each tire pressure transmitter, and a gravity sampling frequency in the rotation cycle of each axle, wherein the position determination unit is configured to determine the tire position based on a determination result produced by the validity determination unit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification