Tire wear measurement device using tire bending stiffness variation and tire wear measurement method using same
Provided is a technology of estimating a bending stiffness variation of a tire and estimating a tread wear amount of a tire using the same. A tire wear measuring apparatus wear includes a signal receiver configured to measure acceleration inside the tire with respect to an axial direction, which is a radial direction of the tire, for each point inside the tire, a signal analyzer configured to receive signal information from the signal receiver and estimate a tread wear rate of the tire by calculating a bending stiffness variation rate of the tire using axial acceleration inside the tire, a transmitter configured to receive and transmit analysis information, which is information on the tread wear rate of the tire, from the signal analyzer, and a control module configured to receive the analysis information from the transmitter and generate a control signal for a vehicle to which the tire is installed. Meanwhile, a physical change thereof is derived using a Flexible Ring tire model which is a mathematical model.
1. An apparatus for measuring tire wear using a bending stiffness variation of a tire, the apparatus comprising:
a signal receiver configured to measure an acceleration inside the tire with respect to a radial direction of the tire, at a plurality of points inside the tire;
a signal analyzer configured to receive signal information from the signal receiver and estimate a tread wear rate of the tire by calculating a bending stiffness variation rate of the tire using the acceleration measured inside the tire;
a transmitter configured to receive and transmit analysis information comprising information on the tread wear rate of the tire, from the signal analyzer; and
a control module configured to receive the analysis information from the transmitter and generate a control signal for a vehicle on which the tire is installed.
2. The apparatus of claim 1 , wherein the signal analyzer is further configured to calculate the bending stiffness variation rate of the tire using the following equation according to a Fourier series analysis, wherein a value on a left-hand side of the following equation is calculated using a value of the acceleration inside the tire:
∫
-
π
π
w
¨
(
θ
)
cos
(
n
θ
)
d
θ
πΩ
2
=
-
Q
π
R
θ
r
π
p
0
×
n
3
An
6
+
(
-
2
A
+
B
)
n
4
+
(
A
-
B
+
C
)
n
2
+
D
×
sin
(
n
θ
r
)
where n is a natural number greater than or equal to 1 corresponding to the plurality of points at which the acceleration is measured inside the tire, θ is a central angle of one point in the tire in response to rotation, {umlaut over (ω)}(θ) is a value obtained by applying θ in an equation derived by differentiating an axial transformation of the tire twice, and A to D are variable dimensionless numbers.
3. The apparatus of claim 2 , wherein the signal analyzer is further configured to periodically derive the dimensionless numbers A to D by repeatedly applying a predetermined variable in each of the dimensionless numbers A to D.
4. The apparatus of claim 1 , wherein the control module comprises:
a vehicle controller configured to control the vehicle; and
an information transmitter configured to receive the analysis information from the transmitter and transmit the analysis information to the vehicle controller,
wherein the vehicle controller is further configured to determine a replacement time of the tire using the analysis information.
5. The apparatus of claim 4 , wherein the control module further comprises a display configured to display information on a replacement time of the tire or a replacement service of the tire.
6. A method of measuring tire wear using the apparatus of claim 1 , the method comprising:
measuring the acceleration inside the tire with respect to the axial direction at the plurality of points inside the tire;
estimating the tread wear rate of the tire by calculating the bending stiffness variation rate of the tire using the acceleration measured inside the tire;
determining a replacement time of the tire using the information on the tread wear rate of the tire; and
transmitting information on the replacement time of the tire to a user of the vehicle and an external integrated control system connected to the vehicle.