US 12,214,625 B2
Wear-condition-sensing device
Masahiro Naruse, Kanagawa (JP); Jun Matsuda, Kanagawa (JP); Heishiro Fudo, Tokyo (JP); Eiji Shinohara, Tokyo (JP); Shinya Ichise, Tokyo (JP); Hiroyuki Tobari, Tokyo (JP); and Yuki Ono, Tokyo (JP)
Assigned to The Yokohama Rubber Co., LTD., Tokyo (JP)
Appl. No. 17/759,321
Filed by The Yokohama Rubber Co., LTD., Tokyo (JP)
PCT Filed Jan. 15, 2021, PCT No. PCT/JP2021/001295
§ 371(c)(1), (2) Date Jul. 22, 2022,
PCT Pub. No. WO2021/153277, PCT Pub. Date Aug. 5, 2021.
Claims priority of application No. 2020-012332 (JP), filed on Jan. 29, 2020.
Prior Publication US 2023/0108225 A1, Apr. 6, 2023
Int. Cl. B60C 11/00 (2006.01); B60C 11/24 (2006.01)
CPC B60C 11/243 (2013.01) [B60C 11/246 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A wear-condition-sensing device comprising:
an element configured to generate voltage based on deformation of a tread portion during tire rotation;
a voltage detection unit configured to detect the voltage generated by the element;
a speed detection unit configured to detect vehicle speed or tire rotation speed;
a storage area configured to integrally store waveform data over time of the voltage detected by the voltage detection unit together with the vehicle speed or the rotation speed detected by the detection unit;
a calculation unit configured to calculate an index value of voltage change based on the waveform data in a predetermined speed range stored in the storage area; and
a determination unit configured to determine a progress condition of wear of the tread portion by comparing the index value calculated by the calculation unit with reference information corresponding to a predetermined speed range to determine a progress state of wear of the tread portion,
the predetermined speed range being a range of ±5 km/h from any speed within a range of 30 km/h to 60 km/h.