阅读说明：本技术 使车轮轮胎总成平衡的方法 (Method for balancing a wheel and tire assembly ) 是由 尹暎三 于 2020-10-13 设计创作，主要内容包括：本发明涉及一种使车轮轮胎总成平衡的方法,所述方法可以包括：测量轮胎的径向力变化(radial force variation,RFV)的最大值位置,并且标记测量出的最大值位置作为轮胎基准位置；测量车轮的内部跳动和外部跳动的每一个；提取测量出的内部跳动的波形的主分量和测量出的外部跳动的波形的主分量,并且将前一个和后一个测量出的主分量分别设置为内部跳动波形和外部跳动波形；将内部跳动波形与外部跳动波形进行合成,并且标记通过合成得到的合成波形的最小值位置作为车轮基准位置；将轮胎上的轮胎基准位置和车轮上的车轮基准位置对准为具有相同相位,并且对车轮与轮胎进行组装。(The present invention relates to a method of balancing a wheel and tire assembly, which may include: measuring a position of a maximum value of Radial Force Variation (RFV) of the tire, and marking the measured position of the maximum value as a tire reference position; measuring each of the inside run-out and the outside run-out of the wheel; extracting the main components of the measured waveform of the internal jitter and the main components of the measured waveform of the external jitter, and setting the former measured main component and the latter measured main component as the internal jitter waveform and the external jitter waveform respectively; synthesizing the inside run-out waveform and the outside run-out waveform, and marking a minimum value position of the synthesized waveform obtained by the synthesis as a wheel reference position; the tire reference position on the tire and the wheel reference position on the wheel are aligned to have the same phase, and the wheel is assembled with the tire.)

1. A method of balancing a wheel and tire assembly, the method comprising:

measuring a position of a maximum value of a radial force variation of the tire, and marking the measured position of the maximum value on the tire as a tire reference position;

measuring each of the inside run-out and the outside run-out of the wheel;

extracting the main components of the measured waveform of the internal jitter and the main components of the measured waveform of the external jitter, and setting the main components as the internal jitter waveform and the external jitter waveform respectively;

synthesizing the inside run-out waveform and the outside run-out waveform, and marking a minimum value position of the synthesized waveform obtained by the synthesis on the wheel as a wheel reference position;

the tire reference position on the tire and the wheel reference position on the wheel are aligned to have the same phase, and the wheel and the tire are assembled.

2. A method according to claim 1, wherein the position of the maximum of the radial force variation of the tyre is set to the position of the maximum of the main component of the radial force variation.

3. The method according to claim 1, wherein in synthesizing the inside run-out waveform and the outside run-out waveform of the wheel, the inside run-out waveform and the outside run-out waveform are superimposed, and only contour portions having relatively large values or the same values are connected, thereby forming a synthesized waveform.

4. The method according to claim 3, wherein when superimposing the internal hopping waveform with the external hopping waveform, one cycle portion of the internal hopping waveform having the same phase is superimposed with one cycle portion of the external hopping waveform in a state where both ends of one cycle portion of the internal hopping waveform are set to be respectively the same as both ends of one cycle portion of the external hopping waveform.

5. A method of balancing a wheel and tire assembly, the method comprising:

measuring each of the inside run-out and the outside run-out of the wheel;

extracting an inside runout waveform expressed as a continuous function from data obtained by measuring the inside runout of the wheel;

extracting an external runout waveform expressed as a continuous function from data obtained by measuring external runout of the wheel;

synthesizing the internal beat waveform and the external beat waveform to generate a synthesized waveform;

marking the position of the minimum value of the synthesized waveform on the wheel as a wheel reference position;

measuring a radial force variation of the tire;

extracting a waveform of the tire expressed as a continuous function from data obtained by measuring a radial force variation of the tire;

marking a maximum value position of a waveform of the tire on the tire as a tire reference position;

the wheel and the tire are assembled in a state where a wheel reference position on the wheel and a tire reference position on the tire are aligned to have the same phase.

6. The method according to claim 5, wherein in extracting the internal pulsation waveform from the data obtained by measuring the internal pulsation of the wheel, the data obtained by measuring the internal pulsation of the wheel is fourier-transformed, the principal component of the fourier-transformed data is extracted, and the extracted principal component is set as the internal pulsation waveform.

7. The method according to claim 5, wherein in extracting the external runout waveform from the data obtained by measuring the external runout of the wheel, the data obtained by measuring the external runout of the wheel is fourier-transformed, a principal component of the fourier-transformed data is extracted, and the extracted principal component is set as the external runout waveform.

8. The method according to claim 5, wherein in synthesizing the internal beat waveform with the external beat waveform to generate a synthesized waveform, one period part of the internal beat waveform having the same phase is superimposed with one period part of the external beat waveform in a state where both ends of the one period part of the internal beat waveform are set to be respectively the same as both ends of the one period part of the external beat waveform, and only parts having a relatively large positive amplitude or the same positive amplitude in the superimposed waveforms are connected to generate the synthesized waveform.

9. A method of marking a location of a minimum value of run-out of a wheel, the method comprising:

measuring each of the inside run-out and the outside run-out of the wheel;

extracting the main components of the measured waveform of the internal jitter and the main components of the measured waveform of the external jitter, and setting the main components as the waveform of the internal jitter and the waveform of the external jitter respectively;

forming a composite waveform by superimposing the inside run-out waveform and the outside run-out waveform of the wheel and connecting only the contour portions having a relatively large value or the same value;

the position of the minimum value of the synthesized waveform is marked as the position of the minimum value of the wheel runout.

10. The method according to claim 9, wherein the synthesized waveform is formed by superimposing the one period part of the internal beat waveform and the one period part of the external beat waveform in a state where both ends of the one period part of the internal beat waveform are set to be respectively the same as both ends of the one period part of the external beat waveform.

Technical Field

The present invention relates to techniques for balancing a wheel and tire assembly.

Background

The tire-mounted wheel is rotatably coupled to the vehicle so as to rotate while the vehicle is running. Balancing of the wheel assembly is critical to whether the vehicle is traveling smoothly and quietly.

Ideally, the tire and wheel can be manufactured with features that are uniform in accuracy in the circumferential direction, but in practice, the finished product is manufactured with a slight degree of tire and wheel imbalance.

The information included in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

Various aspects of the present invention are directed to provide a method of balancing a tire assembly for a wheel configured to provide more appropriate balance between a tire and a wheel, thereby reducing vibration of a vehicle body, slight shaking of a steering wheel, and the like while the vehicle is running. The method provides the advantage that the ride comfort of the vehicle can be improved.

According to various aspects of the present invention, there is provided a method of balancing a wheel and tire assembly, the method comprising: measuring a position of a maximum value of Radial Force Variation (RFV) of the tire, and marking the measured position of the maximum value on the tire as a tire reference position; measuring each of the inside run-out and the outside run-out of the wheel; extracting the main components of the measured waveform of the internal jitter and the main components of the measured waveform of the external jitter, and setting the former measured main component and the latter measured main component as the internal jitter waveform and the external jitter waveform respectively; synthesizing the inside run-out waveform and the outside run-out waveform, and marking a minimum value position of the synthesized waveform obtained by the synthesis on the wheel as a wheel reference position; the tire reference position on the tire and the wheel reference position on the wheel are aligned to have the same phase, and the wheel and the tire are assembled.

In the method, the maximum value position of the RFV of the tire may be set as the maximum value position of the principal component of the RFV.

In the method, when synthesizing the inside run-out waveform and the outside run-out waveform of the wheel, the inside run-out waveform and the outside run-out waveform may be superimposed, and only the contour portion having a relatively large value or the same value may be connected, thereby forming a synthesized waveform.

In the method, when superimposing the internal hopping waveform and the external hopping waveform, one cycle portion of the internal hopping waveform having the same phase may be superimposed with one cycle portion of the external hopping waveform in a state where both ends of the one cycle portion of the internal hopping waveform are set to be respectively the same as both ends of the one cycle portion of the external hopping waveform.

According to various aspects of the present invention, there is provided a method of balancing a wheel and tire assembly, the method comprising: measuring each of the inside run-out and the outside run-out of the wheel; extracting an inside runout waveform expressed as a continuous function from data obtained by measuring the inside runout of the wheel; extracting an external runout waveform expressed as a continuous function from data obtained by measuring external runout of the wheel; synthesizing the internal beat waveform and the external beat waveform to generate a synthesized waveform; marking the position of the minimum value of the synthesized waveform on the wheel as a wheel reference position; measuring the RFV of the tire; extracting a waveform of the tire expressed as a continuous function from data obtained by measuring the RFV of the tire; marking a maximum value position of a waveform of the tire on the tire as a tire reference position; the wheel and the tire are assembled in a state where a wheel reference position on the wheel and a tire reference position on the tire are aligned to have the same phase.

In the method, when the internal run-out waveform is extracted from data obtained by measuring the internal run-out of the wheel, the data obtained by measuring the internal run-out of the wheel may be fourier-transformed, the principal component of the fourier-transformed data may be extracted, and the extracted principal component may be set as the internal run-out waveform.

In the method, when the external runout waveform is extracted from data obtained by measuring the external runout of the wheel, the data obtained by measuring the external runout of the wheel may be subjected to fourier transform, the principal component of the fourier-transformed data may be extracted, and the extracted principal component may be set as the external runout waveform.

In the method, in synthesizing the internal hopping waveform and the external hopping waveform to generate a synthesized waveform, one cycle portion of the internal hopping waveform having the same phase is superimposed with one cycle portion of the external hopping waveform in a state where both ends of the one cycle portion of the internal hopping waveform are set to be respectively the same as both ends of the one cycle portion of the external hopping waveform, and only a portion having a relatively large positive amplitude or the same positive amplitude in the superimposed waveform may be connected to generate the synthesized waveform.

According to yet another aspect of the present invention, there is provided a method of marking a location of a minimum value of run-out of a wheel, the method comprising: measuring each of the inside run-out and the outside run-out of the wheel; extracting the main components of the measured waveform of the internal jitter and the main components of the measured waveform of the external jitter, and setting the former measured main component and the latter measured main component as the internal jitter waveform and the external jitter waveform respectively; forming a composite waveform by superimposing the inside run-out waveform and the outside run-out waveform of the wheel and connecting only the contour portions having a relatively large value or the same value; the position of the minimum value of the synthesized waveform is marked as the position of the minimum value of the wheel runout.

In the method, in a state where both ends of one period part of the internal hopping waveform are set to be respectively the same as both ends of one period part of the external hopping waveform, a synthesized waveform can be formed by superimposing the one period part of the internal hopping waveform and the one period part of the external hopping waveform.

According to still another aspect of the present invention, there is provided an apparatus for marking a position of a minimum value of a runout of a wheel, the apparatus comprising: a measuring unit that measures each of an inside runout and an outside runout of the wheel; a waveform extracting unit that extracts a main component of a waveform of the measured internal jitter and a main component of a waveform of the measured external jitter, and sets the former and latter measured main components as an internal jitter waveform and an external jitter waveform, respectively; a waveform synthesizing unit that forms a synthesized waveform by superimposing the inside run-out waveform and the outside run-out waveform of the wheel and connecting only the contour portion having a relatively large value or the same value; and a marking unit that marks a minimum value position of the synthesized waveform as a minimum value position of the wheel runout.

In the apparatus, the waveform extraction unit may be configured to set a main component obtained by fourier-transforming a waveform of the measured internal jitter as the internal jitter waveform, and set a main component obtained by fourier-transforming a waveform of the measured external jitter as the external jitter waveform.

In the apparatus, the waveform synthesis unit may be configured to: in a state where both ends of one period part of the internal hopping waveform are set to be respectively the same as both ends of one period part of the external hopping waveform, a synthesized waveform is formed by superimposing the one period part of the internal hopping waveform and the one period part of the external hopping waveform.

According to various exemplary embodiments of the present invention, a more appropriate balance between tires and wheels is provided, thereby reducing vibration of a vehicle body, slight shaking of a steering wheel, and the like while the vehicle is running. This provides an advantage that the ride comfort of the vehicle can be improved.

The method and apparatus of the present invention have other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following embodiments incorporated herein, which together serve to explain certain principles of the invention.

Drawings

FIG. 1 is a flow chart illustrating a method of balancing a wheel and tire assembly in accordance with various exemplary embodiments of the present invention;

FIG. 2 is a schematic view illustrating a method of balancing a wheel and tire assembly in accordance with various exemplary embodiments of the present invention;

3A, 3B, 3C and 3D are graphs illustrating the formation of a composite waveform using an inside runout waveform of a wheel and an outside runout waveform of the wheel according to various exemplary embodiments of the present invention;

fig. 4 is a schematic view showing a method of determining a minimum value position of the runout of the wheel using only the outer runout waveform of the wheel;

FIG. 5 is a schematic view showing a method of determining the position of the minimum value of the runout of the wheel using only the inside runout waveform of the wheel;

fig. 6 is a schematic view showing a method of determining a minimum value position of the runout of the wheel using an average value of the inside runout waveform and the outside runout waveform of the wheel;

fig. 7 is a schematic view illustrating a method of determining a location of a minimum value of a runout of a wheel using a synthesized waveform obtained by synthesizing an inside runout waveform and an outside runout waveform of the wheel according to various exemplary embodiments of the present invention;

fig. 8 is a flowchart illustrating a method of marking a location of a minimum value of run-out of a wheel according to various exemplary embodiments of the present invention; and

fig. 9 is a schematic view illustrating a configuration of an apparatus for marking a minimum value position of run-out of a wheel according to various exemplary embodiments of the present invention.

It should be understood that the drawings are not necessarily to scale, presenting a somewhat simplified representation of various features illustrative of the basic principles of the invention. The specific design features included in the present invention, including, for example, specific dimensions, orientations, locations, and shapes, will be determined in part by the particular application and environment of use desired.

In the drawings, like numerals refer to like or equivalent parts throughout the several views of the drawings.

Detailed Description

Reference will now be made in detail to various embodiments of the invention, examples of which are illustrated in the accompanying drawings and described below. While the present invention will be described in conjunction with the exemplary embodiments of the present invention, it will be understood that this description is not intended to limit the invention to those exemplary embodiments. On the contrary, the invention is intended to cover not only the exemplary embodiments of the invention, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims.

Referring to fig. 1 and 2, a method of balancing a wheel tire assembly according to various exemplary embodiments of the present invention includes: step S10, step 20, step 30, step 40, and step 50; step S10 measures a maximum value position of Radial Force Variation (RFV) of the tire T, and marks the measured maximum value position on the tire T as a tire reference position P1; step S20 measures each of the inside runout and the outside runout of the wheel W; step S30 extracting a main component of a waveform of the measured internal jitter and a main component of a waveform of the measured external jitter, and setting the former and latter measured main components as an internal jitter waveform and an external jitter waveform, respectively; a step S40 of synthesizing the inside runout waveform and the outside runout waveform, and marking a minimum value position of the synthesized waveform obtained by the synthesis on the wheel W as a wheel reference position P2; step S50 aligns the tire reference position P1 on the tire T with the wheel reference position P2 on the wheel W to have the same phase, and assembles the wheel W with the tire T.

That is, according to various exemplary embodiments of the present invention, the maximum value position of the RFV of the tire T is measured, and the position measured thereof is marked as the tire reference position P1. Further, the minimum value position obtained from the synthesized waveform obtained by synthesizing the inside runout waveform and the outside runout waveform of the wheel W is marked as the wheel reference position (P2). Therefore, the wheel W and the tire T are assembled in a state where the tire reference position P1 and the wheel reference position P2 are aligned to have the same phase. Therefore, the magnitude of the RFV of the wheel tire assembly is significantly reduced.

Of course, as described above, in a state where the magnitude of the RFV of the wheel tire assembly is reduced, when the wheel tire assembly is mounted on the vehicle, the vibration of the vehicle body or the slight shaking of the steering wheel W due to the dynamic unbalance of the wheel tire assembly when the vehicle is running is reduced or avoided, thereby greatly improving the ride comfort of the vehicle.

For reference, according to various exemplary embodiments of the present invention, the run-out of the wheel means a run-out in a radial direction of the wheel (i.e., in a radial direction thereof).

The maximum value position of the RFV of the tire T is set as the maximum value position of the main component of the RFV.

That is, the RFV is measured while the tire T as an assembly target is rotated in the measuring device. The waveform of the measured RFV is fourier-transformed to obtain the position of the maximum value of the principal component. The acquired position is the tire reference position P1.

Of course, the maximum value position of the measured waveform itself of the RFV may be set to the tire reference position P1 without fourier-transforming the waveform of the RFV (which is measured in the measuring device). However, in this case, due to noise, it is difficult to exclude the possibility of erroneously selecting the substantial maximum value position of the RFV. As described above, according to various exemplary embodiments of the present invention, the maximum value position of the principal component is selected by performing fourier transform. Therefore, the substantial maximum value position of the RFV of the tire T can be correctly selected without a significant error.

On the other hand, as described above, each of the internal run-out and the external run-out of the wheel W is measured, and the respective principal components of the waveforms of the measured internal run-out and external run-out are extracted by fourier transforming the waveform thereof. Therefore, the main component of the waveform of the measured internal jitter is set as the internal jitter waveform, and the main component of the waveform of the measured external jitter is set as the external jitter waveform.

For the synthesis of the internal and external runout waveforms of the wheel W, the internal and external runout waveforms are superimposed. Therefore, only the contour portions having relatively high values or the same values are connected, thereby forming a composite waveform.

That is, in a state where both ends of one period part of the internal hopping waveform and both ends of one period part of the external hopping waveform are respectively the same, one period part of the internal hopping waveform and one period part of the external hopping waveform having the same phase are superimposed. Therefore, in these superimposed waveforms, only the profile portions having relatively large amplitudes or the same amplitudes are connected, thereby forming a composite waveform.

For example, referring to fig. 3A and 3B, when one cycle portion of the inside runout waveform WI and one cycle portion of the outside runout waveform WO are superimposed in a state where both ends of a portion (i.e., one cycle portion) in the range of 0 ° to 360 ° of the inside runout waveform WI of the wheel are set to be respectively identical to both ends of a portion (i.e., one cycle portion) in the range of 0 ° to 360 ° of the outside runout waveform WO of the wheel, as shown in fig. 3C, the two waveforms WI are superimposed with WO. In this state, as shown in fig. 3D, profile portions having a relatively large positive amplitude or the same positive amplitude are connected, thereby forming a synthesized waveform WT.

At this time, B1 and B2 are the minimum position of the synthesized waveform, and finally become the final position of the minimum point of the runout of the wheel determined according to the respective exemplary embodiments of the present invention. When marked on the wheel, either of these two positions becomes the position P2 of the minimum point in the wheel.

Referring to fig. 4, 5, 6 and 7, a method of determining the minimum value position of the runout of the wheel W and marking the minimum value position is described.

Fig. 4 is a schematic view showing a logic 1, which is a method of determining the position of the minimum value of the runout of the wheel W using only the external runout waveform of the wheel W. Four cases obtained by combining the inside runout of the wheel W and the outside runout of the wheel W are classified as samples 1 to 4, respectively. A method of selecting the final minimum position of the beat in each of samples 1 to 4 is described.

Sample 1 is the state: wherein the magnitude of the inside runout of the wheel W is less than 0.05, and therefore, little runout occurs at the inside of the wheel, and the magnitude of the outside runout of the wheel W is 0.15 to 0.3, and therefore, a relatively large degree of runout occurs at the outside of the wheel.

In logic 1, the position of the minimum value of the run-out of the wheel is determined using only the external run-out waveform WO of the wheel. Therefore, the position marked a, which represents the position of the minimum value of the external runout Waveform (WO) of the wheel, is determined as the final minimum value position of the runout of the wheel W. However, at a position substantially represented by a point a of the inside runout Waveform (WI) of the wheel, the maximum runout occurs. Therefore, the point a is not suitable for the position of the minimum value representing the runout of the wheel W.

On the contrary, as described below for comparison, the minimum value positions of the runout of the wheel obtained from the synthesized waveform WT according to the respective exemplary embodiments of the present invention are determined as B1 and B2. As described above, considering that the outer run out of the wheel is minimum and the inner run out of the wheel is maximum at point a, it is understood that B1 and B2 are more suitable for representing the minimum position of the run out of the wheel instead of a.

For reference, in fig. 4, 5, and 6, the position of the minimum value of the run-out of the wheel obtained from the synthesized waveform according to the respective exemplary embodiments of the present invention is represented as an "optimal solution".

As described above, in the case where logic 1 is applied to sample 1, a is located between B1 and B2, and thus a position relatively adjacent to B1 or B2 is selected as the minimum point of the run-out of the wheel. Thus, the evaluation results are to locate a point close to the position of the substantial minimum.

In sample 2, the magnitude of the inside runout of the wheel W is in a relatively large range of 0.15 to 0.3, and the maximum value of the outside runout of the wheel W is less than 0.05. This is contrary to the case in sample 1.

In the case where logic 1 is applied to sample 2, the runout is not even reflected for the inner side of the wheel W where the runout is substantially changed to a large extent, and the minimum position a of the outer runout waveform WO of the wheel is selected as the minimum position of the runout of the wheel. Thus, as shown, the evaluation results in that the position of the minimum value of the run-out of the proper wheel is not located.

In sample 3, in a state where the inside runout waveform and the outside runout waveform are in the same phase, the respective magnitudes of the inside runout and the outside runout of the wheel W are in a large range of 0.15 to 0.3. When logic 1 is applied to sample 3, the position of the minimum value of the external runout waveform WO of the wheel is the same as the position of the minimum value of the internal runout waveform WI of the wheel. Thus, as shown, the evaluation results are that the minimum position is correctly located.

In sample 4, in a state where the inside runout waveform and the outside runout waveform are in opposite phases, the respective magnitudes of the inside runout and the outside runout of the wheel W are in a large range of 0.15 to 0.3. The minimum position of the inside runout waveform WI of the wheel is located on the left side, but the minimum position a of the outside runout waveform WO of the wheel is located on the right side. Therefore, a, which is the minimum position of the external runout waveform WO of the wheel, is not suitable as the minimum position representing the runout of the entire wheel. The evaluation results were: in sample 4, the minimum position on the wheel is not located by applying logic 1.

In contrast to fig. 4, fig. 5 shows a logic 2, which is a method of determining the position of the minimum value of the runout of the wheel W using only the inside runout waveform WI of the wheel.

As shown, in the case of applying logic 2 to sample 2, the evaluation result is to locate a point close to the position of the minimum value. In the case of applying logic 2 to sample 3, the evaluation result is to locate the minimum position. However, in the case where logic 2 is applied to samples 1 and 4, the evaluation result is that the representative minimum position on the wheel W is not located.

Fig. 6 shows a logic 3, which is a method of determining the position of the minimum value of the runout of the wheel W using an average waveform WA, which is the average of the inside runout waveform WI of the wheel and the outside runout waveform WO of the wheel.

Unlike logic 1 or logic 2, in logic 3, the position of the minimum value of the run-out of the wheel is located in consideration of the inside run-out waveform WI of the wheel and the outside run-out waveform WO of the wheel. As shown in the figure, the position of the minimum value of the average waveform WA (which is formed by connecting the amplitude of the inside runout waveform WI with the corresponding average value of the amplitude of the outside runout waveform WO) is determined as the position of the minimum value of the runout of the wheel.

In the case where the logic 3 is applied to the samples 1 to 4, as shown in the figure, in the samples 1, 2 and 3, the position of the minimum value of the runout of the wheel W or the position close to the minimum value thereof is located. However, in sample 4, the same form of beat waveform is arranged in opposite phase. Therefore, the average waveform WA is formed almost as a horizontal line. Thus, the minimum value position of the wheel runout cannot be specified.

Fig. 7 shows a summary of how the minimum value position of the runout of the wheel W is selected in samples 1 to 4 according to various exemplary embodiments of the present invention. As can be seen from fig. 7, in each of samples 1 to 4, a representative minimum value position of the runout of the wheel W is located.

For reference, according to various exemplary embodiments of the present invention, in the case where the minimum position of the run-out of the wheel is located, in each of the samples 1, 2, and 4, two minimum positions of the run-out of the wheel are selected in addition to the sample 3, and in fact, only one of them is marked on the wheel.

Of course, as described above, the RFV of the wheel and tire assembly can be minimized. That is, a substantially representative minimum value position of the runout of the wheel W is located, and then the position is marked as a wheel reference position using a point or the like (P2). Therefore, the wheel and the tire are assembled in a state where the tire reference position P1 of the tire T and the wheel reference position P2 of the wheel W are aligned to have the same phase.

A method of balancing a wheel and tire assembly in accordance with various exemplary embodiments of the present invention is provided.

That is, referring to fig. 1, the method according to various exemplary embodiments of the present invention includes: a step S20 in which each of the inside runout and the outside runout of the wheel is measured; a step S31 in which an inside runout waveform plotted as a continuous function is extracted from data obtained by measuring the inside runout of the wheel; a step S32 in which an external runout waveform plotted as a continuous function is extracted from data obtained by measuring the external runout of the wheel; a step S41 of synthesizing the internal beat waveform and the external beat waveform to generate a synthesized waveform; a step S42 in which a minimum value position of the synthesized waveform is marked on the wheel as a wheel reference position; step S11, in which the RFV of the tire is measured; a step S12 in which a waveform of the tire plotted as a continuous function is extracted from data obtained by measuring the RFV of the tire; a step S13 in which a maximum value position of the waveform of the tire is marked on the tire as a tire reference position; step S50, wherein the wheel and the tire are assembled in a state in which the wheel reference position on the wheel and the tire reference position on the tire are aligned to have the same phase.

In step S31 of extracting an inside runout waveform from data obtained by measuring the inside runout of the wheel, fourier transform is performed on the data obtained from the inside runout of the wheel, a principal component of the fourier-transformed data is extracted, and the extracted principal component is set as the inside runout waveform WI.

In addition, in step S32 of extracting an external runout waveform from data obtained by measuring the external runout of the wheel, fourier transform is performed on the data obtained from the external runout of the wheel, a principal component of the fourier transformed data is extracted, and the extracted principal component is set as the external runout waveform WO.

In step S41 of generating the synthesized waveform WT, both ends of one period part of the internal beat waveform WI are set to be the same as both ends of one period part of the external beat waveform WO, respectively, in a state where the one period part of the internal beat waveform WI and the one period part of the external beat waveform WO are aligned to have the same phase. Therefore, only the portion having a relatively large positive amplitude or the same positive amplitude in the superimposed waveform is connected, thereby forming the composite waveform WT.

On the other hand, only the method of marking the position of the minimum value of the run-out of the wheel is described below separately. As shown in fig. 8, the method includes step S20, step S30, step S41, and step S42; step S20 measures each of the inside runout and the outside runout of the wheel W; step S30 extracting a main component of a waveform of the measured internal jitter and a main component of a waveform of the measured external jitter, and setting the former and latter measured main components as an internal jitter waveform and an external jitter waveform, respectively; step S41 superimposes the inside runout waveform and the outside runout waveform of the wheel W to form a composite waveform by connecting only the contour portions having a relatively large value or the same value; step S42 marks the minimum value position of the synthesized waveform as the minimum value position of the runout of the wheel W.

That is, the minimum value position of the runout of the wheel is the same as the wheel reference position.

Of course, in a state where both ends of one period part of the internal hopping waveform are set to be respectively the same as both ends of one period part of the external hopping waveform, a synthesized waveform is formed by superimposing one period part of the internal hopping waveform having the same phase with one period part of the external hopping waveform.

Fig. 9 is a schematic view illustrating a configuration of an apparatus for marking a minimum value position of run-out of a wheel according to various exemplary embodiments of the present invention. The device comprises a measuring unit 1, a waveform extracting unit 3, a waveform synthesizing unit 5 and a marking unit 7; the measuring unit 1 measures each of the inside runout and the outside runout of the wheel; the waveform extraction unit 3 extracts a main component of a waveform of the measured internal jitter and a main component of a waveform of the measured external jitter, and sets the former and latter measured main components as an internal jitter waveform and an external jitter waveform, respectively; the waveform synthesizing unit 5 superimposes the inside run-out waveform and the outside run-out waveform of the wheel to form a synthesized waveform by connecting only contour portions having a relatively large value or the same value; the marking unit 7 marks the minimum value position of the synthesized waveform as the minimum value position of the wheel runout.

Of course, a measuring device for measuring the RFV of the tire may be separately provided. The marking device can additionally be configured to measure the RFV of the tire.

The waveform extraction unit 3 is configured to: a main component obtained by Fourier-transforming a waveform of the measured internal jitter is set as an internal jitter waveform, and a main component obtained by Fourier-transforming a waveform of the measured external jitter is set as an external jitter waveform.

The waveform synthesizing unit 5 is configured to: in a state where both ends of one period portion of the internal hopping waveform are set to be respectively the same as both ends of one period portion of the external hopping waveform, the one period portion of the internal hopping waveform and the one period portion of the external hopping waveform having the same phase are superimposed, thereby generating a synthesized waveform.

In various exemplary embodiments of the present invention, a controller may perform the method of the present invention such as fig. 1 and 8, and the controller may include the measuring unit 1, the waveform extracting unit 3, the waveform synthesizing unit 5, and the marking unit 7 disclosed in fig. 9.

In addition, the term "controller" or "control unit" denotes a hardware device comprising a memory and a processor configured to execute one or more steps understood as an algorithmic structure. The memory stores algorithm steps, and the processor executes the algorithm steps to perform one or more processes of the method according to various exemplary embodiments of the present invention. The controller according to an exemplary embodiment of the present invention may be implemented by a non-volatile memory configured to store an algorithm for controlling operations of various components of a vehicle or data regarding software instructions for executing the algorithm and a processor configured to perform the above-described operations using the data stored in the memory. The memory and the processor may be separate chips. Alternatively, the memory and the processor may be integrated in a single chip. The processor may be implemented as one or more processors.

The controller or control unit may be at least one microprocessor operated by a predetermined program, which may include a series of instructions for performing the methods according to various exemplary embodiments of the present invention.

The foregoing invention can also be embodied as computer readable codes on a computer readable recording medium. The computer readable recording medium is any data storage device that can store data which can be thereafter read by a computer system. Examples of the computer-readable recording medium include a Hard Disk Drive (HDD), a Solid State Disk (SSD), a Silicon Disk Drive (SDD), a Read Only Memory (ROM), a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and are implemented as a carrier wave (e.g., transmission through the internet).

For convenience in explanation and accurate definition in the appended claims, the terms "upper", "lower", "inner", "outer", "upper", "lower", "upward", "downward", "front", "rear", "back", "inward", "outward", "inner", "outer", "inner", "outer", "forward", "rearward" are used to describe features of the exemplary embodiments with reference to the positions of such features as displayed in the figures. It will be further understood that the term "coupled" or its derivatives refer to both direct and indirect connections.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. The foregoing description is not intended to be exhaustive or to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable others skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the following claims and their equivalents.