METHOD OF MEASURING CHANGE IN STATE OF TIRE AND MEASURING DEVICE THEREOF

摘要

PURPOSE: A method of measuring a change in the state of a tire and a measuring device thereof are provided to measure the state of the tire without changing the existing tire manufacture process and tire structure and to exactly measure changes in the inner temperature and pneumatic pressure of the tire and a change in the outer shape of the running tire. CONSTITUTION: A device for measuring a change in the state of a tire(1) comprises a magnetization layer(12) formed to a side wall part(11) of the tire; a magnetizing unit(3) installed to a vehicle body near the side wall part, to magnetize the magnetization layer; a first sensor(4) sensing the value of the magnetic force before the magnetized portion passes through the ground; a second sensor(5) sensing the value of the magnetic force after the magnetized portion passes through the ground; a demagnetization unit(7) eliminating the magnetic force of the magnetization layer passed through the second sensor; and a display unit(9) displaying a difference in the magnetic force values sensed from the first and second sensors.