US 12,188,844 B2
Tire ground contact characteristic measuring method, tire ground contact characteristic measuring portion, and tire ground contact characteristic measuring system
Takahisa Kamikura, Tokyo (JP)
Assigned to BRIDGESTONE CORPORATION, Tokyo (JP)
Appl. No. 17/298,829
Filed by BRIDGESTONE CORPORATION, Tokyo (JP)
PCT Filed Jul. 11, 2019, PCT No. PCT/JP2019/027524
§ 371(c)(1), (2) Date Jun. 1, 2021,
PCT Pub. No. WO2020/115940, PCT Pub. Date Jun. 11, 2020.
Claims priority of application No. 2018-227656 (JP), filed on Dec. 4, 2018.
Prior Publication US 2022/0034755 A1, Feb. 3, 2022
Int. Cl. G01M 17/02 (2006.01)
CPC G01M 17/022 (2013.01) 8 Claims
OG exemplary drawing
 
1. A tire ground contact characteristic measuring method comprising:
reproducing a transient change in a tire attitude that occurs during travel of an actual vehicle on a tire;
causing a stress measuring sensor embedded on a rotatable rotary drum to measure stress that is applied to the tire in contact with the rotary drum that is rotationally driven; and
calculating tire ground contact characteristics, which are characteristics of a ground contact region of a tread surface of the tire in contact with the rotary drum, on the basis of the stress measured by the stress measuring sensor,
wherein the calculated tire ground contact characteristics are tire ground contact characteristics of the tire corresponding to the tire attitude of the actual vehicle at each point in time during a period where the transient change occurs,
in the reproducing the transient change in the tire attitude that occurs during travel of the actual vehicle on the tire,
a rotational speed of the rotary drum is adjusted,
a position of the tire with respect to the rotary drum is adjusted in a direction of an axis of rotation and/or a radial direction of the rotary drum,
a rotational speed of the tire is adjusted,
a camber angle, a slip angle, and a grip force of the tire is adjusted, and
air pressure of the tire is adjusted,
in the reproducing the transient change in the tire attitude, the camber angle, the slip angle, and the grip force to be given to the tire are continuously changed with a passage of time from a start to an end during the period where the transient change occurs,
the stress measuring sensor continuously measures stress applied to the tire at least for each rotation of the rotary drum from the start to the end during the period where the transient change occurs,
amounts of displacement and/or acting forces of a vehicle body and a wheel of a test vehicle are measured,
a displacing the vehicle body and the wheel of the test vehicle is based on predicted vehicle characteristics,
at least one of a change of the rotational speed of the rotary drum, a change of the position of the tire with respect to the rotary drum, a change of the rotational speed of the tire, and a change of an angle of the tire is performed on the basis of measurement data based on the vehicle characteristics, and
a command based on the predicted vehicle characteristics is transmitted to an electronic control unit of the test vehicle to cause the electronic control unit of the test vehicle to recognize a traveling state.