US 12,083,832 B2
Tire deterioration inferring device and tire deterioration inferring method
Heishiro Fudo, Miyagi-ken (JP); Eiji Shinohara, Niigata-ken (JP); Shinya Ichise, Miyagi-ken (JP); Hiroyuki Tobari, Miyagi-ken (JP); Akihito Yamamoto, Miyagi-ken (JP); and Yuki Ono, Niigata-ken (JP)
Assigned to Alps Alpine Co., Ltd., Tokyo (JP)
Filed by Alps Alpine Co., Ltd., Tokyo (JP)
Filed on Nov. 24, 2021, as Appl. No. 17/535,207.
Application 17/535,207 is a continuation of application No. PCT/JP2020/010984, filed on Mar. 13, 2020.
Claims priority of application No. 2019-111194 (JP), filed on Jun. 14, 2019.
Prior Publication US 2022/0080779 A1, Mar. 17, 2022
Int. Cl. B60C 11/24 (2006.01); B60C 23/06 (2006.01)
CPC B60C 11/246 (2013.01) [B60C 23/064 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for estimating deterioration of a tire, using a tire deterioration estimation device including a sheet-shaped piezoelectric sensor placed on an inner surface of the tire, the piezoelectric sensor including a first piezoelectric sensor and a second piezoelectric sensor having different sensitivities in a direction in which the tire deforms, the method comprising:
measuring a tire deformation velocity while the tire is rotating, thereby obtaining a periodic change of the tire deformation velocity, the measuring including:
measuring a deformation velocity of the inner surface of the tire as the tire deformation velocity with the first and second piezoelectric sensors;
calculating at least one peak value of the tire deformation velocity from the periodic change of the tire deformation velocity, the at least one peak value including:
a first peak value based on a measurement result of the first piezoelectric sensor and obtained at or before stepping of the tire, or at or after kicking of the tire; and
a second peak value based on a measurement result of the second piezoelectric sensor and obtained at the ground contact of the tire; and
estimating a degree of deterioration of the tire using the first peak value and the second peak value of the tire deformation.