In general, as you drive a car, tires wear out due to contact with road surfaces. The wear state of the tire is directly connected to the driver's safety and is recognized as a major factor in the tire evaluation. Accordingly, various apparatuses for measuring the wear state of tires have been developed.
Representative, the conventional tire wear measurement apparatus has been using a surface scan method to measure the wear state of the tire, this method takes a long time to measure the tire wear state once, a problem that reveals a lot of errors in the political analysis There was this.
As another example, a method for evaluating wear of a tire tread is disclosed in Korean Patent Laid-Open No. 1998-0027012 filed by Kumho Tire. The wear tread evaluation method of the tire tread is applied to the surface of the tire with a paint of a color that differs greatly in the color of the tire surface and the reflectivity of the light in order to evaluate the wear of the tire tread, and then measure the difference in reflectance of the light after driving. By doing so, it is possible to shorten the test time and perform a high resolution quantitative evaluation of the wear of the tire tread, but this also has a problem that many errors exist in the political analysis.
The present invention is to solve the above-mentioned conventional problems, by using a single image and cosine grating rather than surface scanning method to measure the wear state of the tire before and after running very quickly and accurately An object of the present invention is to provide a tire wear measuring apparatus that can be used.
In order to achieve the object of the present invention as described above, and to perform the characteristic functions of the present invention described below, the characteristic configuration of the present invention is as follows.
According to an aspect of the present invention (meaning of embodiment, aspect, shape, etc.), light source means for irradiating light to a tire surface before and after traveling using cosine grating provided inside the lens, and the tire surface is irradiated A tire wear measuring apparatus is provided that includes a digital camera means for measuring the intensity of the light to indicate the amount of wear on the tire surface as statistic data in the form of a single image.
Herein, the digital camera means obtains displacement information and phase information after Fourier Transform by the following formulas (1), (2), and (3), and calculates the measured intensity of light. By regularly data on the amount of wear, it is possible to accurately identify the state of wear.
A is the light intensity, and x and y represent tire positions in space.
According to the present invention, as a result of the simulation, it is possible to measure the wear state of the tire very quickly compared to the existing measurement time, can be easily measured without spatial constraints, and can be routinely data in the form of a single image before and after driving The effect of accurately analyzing the wear state of the is achieved.
The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It is to be understood that the various embodiments of the invention are different, but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein may be embodied in other embodiments without departing from the spirit and scope of the invention with respect to one embodiment. In addition, it is to be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the invention. Accordingly, the following detailed description is not to be taken in a limiting sense, and the scope of the present invention, if properly described, is defined only by the appended claims, along with the full range of equivalents to which such claims are entitled. Like reference numerals in the drawings refer to the same or similar functions throughout the several aspects.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention.
1 is a view showing an exemplary tire wear measurement apparatus according to an embodiment of the present invention.
As shown in FIG. 1, the tire wear measuring apparatus of the present invention includes a light source means 100, a tire 200, and a digital camera means 300.
Referring to the light source means, the light source means 100 of the present invention is provided with a lens, and serves to irradiate light to the tire surface 200 before and after driving through cosine gration provided inside the lens. To perform.
The digital camera means 300 of the present invention first measures the intensity of light irradiated onto the tire surface by the light source means 100. In this case, the intensity of the light to be measured may be expressed as in Equation (1) below.
A is the light intensity, and x and y represent tire positions in space.
Subsequently, the digital camera means 300 of the present invention can use the measured light to represent the amount of wear on the tire surface as the statistic data in the form of a single image, which is based on Fourier Transform (Equation 1). When it can be expressed as shown in the following formula (2) and (3).
Subsequently, the digital camera means 300 of the present invention obtains phase information (displacement information, iφ) when the equation (3) is expressed as Equation (4) below in order to obtain the necessary phase information (displacement information). It becomes possible. As a result, the difference between the tires before and after the tire wear is obtained, and the amount of wear on the tire surface can be represented by the routine data in the form of a single image.
2 to 6 is a view showing a single image results simulated by the tire wear measurement apparatus according to an embodiment of the present invention.
First, referring to FIGS. 2 and 3, FIG. 2 illustrates a block height of a tire surface simulated before driving and before tire wear occurs, and FIG. 3 illustrates a simulated tire surface after tire wear occurs after driving. The block height is shown. Through this, the tire wear state can be compared sufficiently.
4 and 5, FIG. 4 shows the wear state of the tire surface after Fourier transformation through the equations (1), (2), (3) and (4) above tire wear. 5 shows the wear state of the tire surface after Fourier transformation through the above equations (1), (2), (3) and (4) after tire wear. As can be seen from the comparison of FIG. 4 and FIG. 5, it is possible to sufficiently know the tire wear state obtained through the Fourier transform.
Lastly, referring to FIG. 6, FIG. 6 shows the state of abrasion wear by obtaining an absolute difference between before and after abrasion of the intensity of light irradiated onto a tire surface. At this time, the X, Y axis shown represents the size of the tire block, the value on the right represents the groove height (Groove) according to the color. For example, in the figure on the right side, the value of 0 means that the wear amount is zero in black, and the white portion represents the wear amount of about 0.25 mm.
Accordingly, as can be seen from FIG. 6, in the present example, the amount of wear on the tire surface is determined by the routine data in the form of a single image by obtaining the absolute value difference before and after the wear of the Fourier transform of the intensity of light irradiated onto the tire surface. Can be displayed. As a result, it can be seen that the tire wear measuring apparatus of the present invention is provided so that a user can sufficiently check the wear state in the form of a single image.