JP5997940B2 - Tire judgment device by road surface vibration, tire judgment method, and tire judgment program - Google Patents

Description

  The present invention relates to a tire determination device, a tire determination method, and a tire determination program.

  On roads that can travel at high speed, such as automobile-only roads, travel restrictions may be imposed depending on the weather conditions. There are various types of travel regulations, including tire regulations. For example, in order to prevent slipping due to worsening weather or a decrease in temperature, there may be a restriction that does not allow a vehicle with summer tires to travel.

  In addition, in order to predict the noise performance of a tire, a technique for simulating acoustic characteristics using a space formed between a tire model and a road surface as an acoustic tube model is known (for example, see Patent Document 1). In addition, coasting noise (hereinafter referred to as traveling sound) generated from a traveling vehicle is roughly classified into tire road noise and vehicle noise as shown in FIG. 6, and tire road noise is 70% to 80% of the total noise. (Bridgestone Co., Ltd., “Basics and Practice of Automobile Tires”, first edition, Sankai-do Co., Ltd., January 2006, p. 190, etc.).

Japanese Patent Laid-Open No. 2007-237752

Conventionally, the type of tire attached to a vehicle traveling on a road has been visually confirmed, but there has been a problem that the visual confirmation is inaccurate. In addition, since visual confirmation takes time, it causes traffic congestion.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a technique capable of automatically and accurately determining the type of tire attached to a vehicle even while the vehicle is traveling.

  In order to achieve the above object, in the present invention, the type of tire mounted on the vehicle is determined based on the vibration of the road surface caused by the traveling of the vehicle. That is, when the vehicle travels, the road surface vibration depends on the type of tire, and therefore the type of tire mounted on the vehicle can be determined by analyzing the road surface vibration.

  Here, the road surface vibration acquisition means only needs to be able to acquire road surface vibrations transmitted from the vehicle to the road surface during traveling. For example, a vibration sensor attached to the road surface within a predetermined distance from the toll gate May be acquired for each vehicle. As a method of attaching the vibration sensor to the road surface, various methods can be adopted, and the vibration sensor may be configured to be able to acquire vibration by contacting the road surface, or the vibration sensor may be embedded in the road surface. The vibration may be obtained by the above.

  The tire determination means only needs to be able to determine the type of tire based on the vibration of the road surface due to traveling of the vehicle, and by specifying that the road vibration reflects the type of tire mounted on the vehicle. What is necessary is just to determine the kind of tire. The analysis of road vibration can be performed by various methods. The vibration intensity, frequency, profile (waveform), etc. may be analyzed, and the presence or absence of vibration having a predetermined characteristic may be confirmed. This method can be adopted.

  In addition, for example, it is possible to analyze a road surface vibration and determine that a specific tire is mounted on the vehicle when the road surface vibration characteristic is confirmed to be a characteristic according to a specific tire type. good. That is, it is possible to adopt a configuration in which it is determined that the specific type of tire is mounted on the vehicle when the vibration of the road surface due to traveling of the vehicle includes a vibration component corresponding to the specific type of tire.

  Various types of tires can be defined, and tires that can differ in vibration transmitted to the road surface when traveling due to different types may be defined as different types of tires. Examples of tire types that can be defined in this way include summer tires and winter tires. Therefore, for example, if the characteristics of road vibration due to traveling of a vehicle equipped with summer tires and winter tires are defined in advance, the characteristics of road vibration due to actual traveling of the vehicle and the predefined vehicle traveling may be determined. The type of tire can be determined by comparing the characteristics of the road surface vibration.

  Further, a configuration for analyzing the vibration of the road surface and determining that the vehicle is equipped with a winter tire when the frequency characteristic of the road surface vibration is a frequency characteristic of a road surface vibration caused by traveling of a vehicle equipped with a winter tire. It is also good. Here, the frequency characteristic is a relation between the physical characteristic of vibration and the frequency, and may be a relation in which characteristics of the summer tire and the winter tire appear to be distinguishable. Accordingly, the relationship between the vibration intensity and the frequency is defined, and when the characteristics of the summer tire and the winter tire appear, the respective characteristics may be defined as the frequency characteristics of the summer tire and the winter tire.

  The frequency characteristics of the summer tire and the winter tire may be defined for both the summer tire and the winter tire, or may be defined for only one of them. If it is the former, it is determined whether or not the frequency characteristic of road surface vibration is the frequency characteristic of a vehicle equipped with summer tires, and further whether or not it is the frequency characteristic of vibrations of the road surface equipped with winter tires. It becomes the structure which determines. In the latter case, it is determined whether or not the frequency characteristics of the road surface vibration are the frequency characteristics of the road surface vibration caused by the travel of the vehicle equipped with the winter tire, and the road surface vibration caused by the travel of the vehicle equipped with the winter tire is determined. If it is not the frequency characteristic of the vibration, it is possible to adopt a configuration that determines that the frequency characteristic is the vibration of the road surface due to the traveling of the vehicle on which the summer tire is mounted. Of course, it is determined whether or not the frequency characteristics of the road surface vibration due to the travel of the vehicle with the summer tire attached. You may employ | adopt the structure determined to be the frequency characteristic of the vibration of the road surface by driving | running | working of the mounted vehicle.

  In addition, it is known that most of the traveling sound of a normal vehicle is composed of pattern main groove resonance sound and pattern excitation sound. These pattern main groove resonance sound and pattern vibration sound are components of running sound due to the shape of the tire.When comparing the pattern main groove resonance sound and pattern vibration sound with the summer tire and winter tire, Due to the difference in the tread pattern, the ratio of each component in the noise is different. That is, the summer tire has a larger pattern main groove resonance sound component generated from the air column tube formed by the rib pattern and the road surface in the ground contact portion, and the winter tire is caused by the impact when the tire surface block contacts the road surface. The pattern excitation sound component which is a sound becomes large.

  And although the impact at the time of contact with the block of the surface of such a winter tire and a road surface is transmitted to a road surface, in a summer tire, there is little impact transmitted to a road surface in this way. Accordingly, vibration equivalent to the pattern excitation sound is transmitted to the road surface, but vibration equivalent to the pattern main groove resonance sound is not transmitted to the road surface. Therefore, if the vibration of the frequency characteristic equivalent to the pattern excitation sound is specified from the vibration of the road surface, when the vibration of the frequency characteristic equivalent to the pattern excitation sound is specified, the winter tire, the pattern excitation sound and When the vibration having the same frequency characteristic is not specified, it can be determined that the summer tire is mounted.

  Furthermore, when analyzing the vibration of the road surface, the characteristic of the peak frequency of the strength of the vibration of the road surface may be a frequency characteristic. For example, a configuration may be adopted in which it is determined that a winter tire is mounted on the vehicle when the peak frequency of the vibration intensity of the road surface is included in a predetermined frequency range of the winter tire. Of course, in this case, it may be configured to determine that the vehicle is equipped with summer tires when the peak frequency of the vibration level of the road surface is included in a predetermined frequency range of summer tires. It may be determined that the summer tire is attached when the peak frequency of the intensity is not included in the predetermined frequency range of the winter tire.

  That is, the pattern excitation sound has a frequency that depends on the vehicle speed of the vehicle, the number of blocks in the circumferential direction of the winter tire, and the like, and in the vibration including the same component as the pattern excitation sound, the profile has a peak at the frequency. Become. Therefore, by analyzing whether or not a peak frequency exists in a frequency range corresponding to the frequency range of the pattern excitation sound, it is possible to determine whether or not a winter tire is mounted on the vehicle.

  Further, the pattern vibration noise is caused by an impact when a block on the tire surface surrounded by a groove extending along the circumference centered on the rotation axis of the tire and a groove intersecting the groove comes into contact with the road surface. It is a sound, and the frequency depends on the vehicle speed of the vehicle (the lower the vehicle speed, the lower the frequency). Therefore, paying attention to the fact that the frequency of the pattern excitation sound depends on the vehicle speed, the type of tire may be determined using the fact that the peak frequency of the road surface vibration intensity has a speed dependency. For example, a configuration may be adopted in which it is determined that a winter tire is mounted on the vehicle when it is detected that the peak frequency of the vibration intensity of the road surface has speed dependency. Note that the configuration for precisely specifying the vehicle speed is not essential here, and the peak of the vibration intensity of the road surface is based on the fluctuation of the peak frequency of the vibration intensity of the road surface when the vehicle speed is changing. It may be configured to detect that the frequency has speed dependency. For example, if road vibration due to vehicle travel is detected at multiple positions on the road where the vehicle is accelerating / decelerating, the peak frequency of the road vibration intensity varies depending on the speed when the peak frequency of the road vibration intensity fluctuates. It can be concluded that there is sex. Since the pattern excitation sound has a characteristic that the frequency decreases as the vehicle speed decreases, winter tires are attached to the vehicle when it is detected that the peak frequency of road vibration intensity decreases as the vehicle speed decreases. The structure which determines with it may be sufficient.

  Furthermore, it is good also as a structure which determines with the winter tire being mounted | worn with the vehicle, when the vibration more than predetermined intensity | strength is acquired as a vibration of a road surface. That is, when vibration equivalent to the pattern excitation sound is transmitted from the vehicle wearing the winter tire to the road surface, and vibration equivalent to the pattern main groove resonance sound is not transmitted from the vehicle wearing the summer tire to the road surface, The intensity of road vibration due to traveling of a vehicle wearing winter tires is large, and the intensity of road vibration due to traveling of a vehicle wearing summer tires is small. Therefore, when a vibration having a predetermined strength or more is acquired as the vibration of the road surface, it can be considered that a winter tire is mounted on the vehicle. According to this configuration, the type of tire can be determined by simple analysis of vibration.

  Although the case where the present invention is realized as an apparatus has been described above, the present invention can be realized as a method and program for realizing the apparatus and a medium recording the program. In addition, the tire determination processing device as described above may be realized alone, applied to a certain method, or used in a state where the method is incorporated in another device. The idea is not limited to this and includes various aspects. In addition, the implementation mode can be changed as appropriate, such as software or hardware. The software recording medium may be a magnetic recording medium, a magneto-optical recording medium, or any recording medium to be developed in the future.

(1A) is a diagram showing a tread pattern of a summer tire, (1B) is a diagram showing a tread pattern of a winter tire, and (1C) is a graph showing frequency characteristics of a running sound of a vehicle. (2A) and (2B) are graphs showing the frequency characteristics of the running sound of the vehicle. (3A) and (3B) are graphs showing frequency characteristics of road surface vibrations caused by running of the vehicle. It is a block diagram which shows one Embodiment of this invention. It is a flowchart which shows a tire determination process. It is a figure for demonstrating the running sound which generate | occur | produces from the vehicle in driving | running | working. It is a flowchart which shows a tire determination process.

Here, embodiments of the present invention will be described in the following order.
(1) Principle of tire judgment:
(2) Configuration of tire determination system and tire determination processing:
(3) Other embodiments:

(1) Principle of tire judgment:
FIG. 6 shows the main components of the vehicle running sound, and it is known that the tire road noise that occupies most of the vehicle running noise is mainly composed of pattern main groove resonance sound and pattern excitation sound. It has been. When the summer tire and the winter tire are compared, the ratio of each component in the noise is different due to the difference in each tread pattern. That is, the summer tire has a larger pattern main groove resonance sound component generated from the air column tube formed by the rib pattern and the road surface in the ground contact portion, and the winter tire is caused by the impact when the tire surface block contacts the road surface. The pattern excitation sound component which is a sound becomes large.

  Furthermore, as shown in FIG. 6, the pattern excitation sound is classified as a vibration sound, and the pattern main groove resonance sound is not classified as a vibration sound. That is, the collision between the tire block causing the pattern excitation sound and the road surface causes road surface vibration, but the air column tube causing the pattern main groove resonance does not cause the road surface vibration. Therefore, the vibration of the frequency component equivalent to the pattern excitation sound is transmitted to the road surface, and the vibration of the frequency component equivalent to the pattern main groove resonance sound is not transmitted to the road surface.

  FIG. 1A is a typical summer tire tread pattern, and FIG. 1B is a typical winter tire tread pattern. As shown in FIG. 1B, in a winter tire, a plurality of blocks B surrounded by a groove Gr extending along a circumference centering on the rotation axis A of the tire and a groove Gl intersecting the groove are arranged. Thus, a tread pattern is formed. And in the tread pattern of a winter tire, as shown to FIG. 1B, the width | variety of the groove | channel Gr and the groove | channel Gl is approximating, and the depth is also approximating. Further, the groove Gl of the winter tire is wider and deeper than the lug pattern Gl of the summer tire shown in FIG. 1A. Accordingly, the ratio of the pattern excitation sound component generated due to the block B is increased in the traveling sound with the winter tire mounted, and the road surface vibration includes many vibration components equivalent to the pattern excitation sound.

なお、式（１）において、ｆはパターン加振音の周波数（Ｈｚ）、Ｖは車両の車速（ｋｍ／ｈ）、ｎは周方向のブロックＢの個数、Ｒはタイヤの半径（ｍ）である。式（１）に示すように、パターン加振音の周波数は、車両の車速に依存し、車速が小さいほど低い周波数となる。例えば、車速＝４０ｋｍ／ｈ、ｎ＝６０、Ｒ＝０．２７ｍ程度の状態を想定すると、パターン加振音の周波数は４００Ｈｚ程度の周波数域になり、車速以外の値を固定するとパターン加振音の周波数は車速に比例する。また、車速３０ｋｍ／ｈ、５０ｋｍ／ｈ程度の状態を想定すると、パターン加振音の周波数はそれぞれ３００Ｈｚ，５００Ｈｚ程度の周波数域になる。 Here, the frequency of the pattern excitation sound is as shown in the following formula (1).

In equation (1), f is the frequency (Hz) of the pattern excitation sound, V is the vehicle speed (km / h), n is the number of blocks B in the circumferential direction, and R is the tire radius (m). is there. As shown in Expression (1), the frequency of the pattern excitation sound depends on the vehicle speed of the vehicle, and becomes lower as the vehicle speed is lower. For example, assuming a state where the vehicle speed is 40 km / h, n = 60, and R = 0.27 m, the frequency of the pattern excitation sound is in the frequency range of about 400 Hz, and if a value other than the vehicle speed is fixed, the pattern excitation sound The frequency of is proportional to the vehicle speed. Further, assuming a state where the vehicle speed is about 30 km / h and 50 km / h, the frequency of the pattern excitation sound is in a frequency range of about 300 Hz and 500 Hz, respectively.

  Fig. 1C measures the running sound of a vehicle running at 40 km / h, Figs. 2A and 2B run at 30 km / h and 50 km / h, and the vertical axis represents the intensity of the running sound, and the horizontal axis represents the logarithm of frequency. It is the shown graph. Here, it is standardized in the entire frequency range so that the integrated value of the intensity of the running sound is 1. As shown in these graphs, when the frequency characteristics obtained by measuring the intensity of the traveling sound of a vehicle traveling at 30 km / h, 40 km / h, 50 km / h with winter tires are analyzed, It was confirmed that the peak frequency appears in the vicinity of 300 Hz, 400 Hz, and 500 Hz, and it was confirmed that the peak frequency depends on the vehicle speed.

  Therefore, if the frequency range in which the pattern excitation sound appears is defined in advance, the peak frequency of the traveling sound intensity is included in the frequency range, or the peak frequency of the traveling sound intensity is dependent on the vehicle speed. In addition, it can be determined that winter tires are mounted on the vehicle. However, as shown in FIGS. 1C, 2A, and 2B, although the peak of the pattern excitation sound is clear, the bottom of the peak is not clear and includes various noises. Further, the running sound includes pattern excitation sound and pattern main groove resonance sound, and these pattern excitation sound and pattern main groove resonance sound are measured simultaneously.

  Therefore, in the present embodiment, by analyzing the vibration of the road surface instead of the running sound, the vibration substantially equivalent to the pattern main groove resonance sound is excluded, and the vibration equivalent to the pattern excitation sound is extracted. Are configured to perform analysis. FIG. 3A shows the frequency characteristics of road vibration when a vehicle equipped with summer tires travels at 30 km / h, 40 km / h, and 50 km / h on the road surface, and FIG. 3B shows a vehicle with winter tires mounted on the road surface at 30 km. The frequency characteristics of road surface vibration when traveling at / h, 40 km / h, and 50 km / h are shown. 3A and 3B, the vertical axis represents a value indicating the intensity of road vibration, and the horizontal axis represents a frequency. Moreover, in FIG. 3A and FIG. 3B, it is the vibration of a road surface in case a solid line is 30 km / h, a dashed-dotted line is 40 km / h, and a broken line is 50 km / h. Furthermore, in FIG. 3A and FIG. 3B, conditions other than the tire type such as road surface, vehicle, vibration sensor, and weather are common.

  In vehicles where the vibration of the road surface is measured, the peak frequency of pattern excitation sound when traveling at 30 km / h is about 230 Hz, and the peak frequency of pattern excitation sound when traveling at 40 km / h is about 310 Hz, The peak frequency of the pattern excitation sound when traveling at 50 km / h is about 400 Hz. Therefore, as shown in FIG. 3B, the vibration equivalent to the pattern excitation sound clearly appears in the vibration of the road surface on which the vehicle equipped with the winter tire travels. On the other hand, as shown in FIG. 3A, the vibration equivalent to the pattern excitation sound does not appear in the vibration of the road surface on which the vehicle equipped with the summer tire traveled. Therefore, in the present embodiment, the type of tire is determined by acquiring and analyzing road surface vibrations caused by traveling of the vehicle. According to this configuration, the type of tire can be determined with high accuracy.

(2) Configuration of tire determination system and tire determination processing:
FIG. 4 is a block diagram showing an embodiment of the tire determination system of the present invention, and FIG. 5 is a flowchart showing a tire determination process executed by the tire determination system. Various devices can be connected to the tire determination device 10 according to the present embodiment via an interface (not shown). In the present embodiment, an amplifier 41 and a display unit 42 are connected to the tire determination device 10. A vibration sensor 40 is connected to the amplifier 41.

  In addition, the tire determination device 10 includes a control unit 20 and a recording medium 30. The control unit 20 includes a CPU, RAM, ROM, and the like (not shown), and can execute a program recorded in the recording medium 30 or the ROM. In the present embodiment, the tire determination program 21 can be executed as one of the programs. In addition, frequency information 30a indicating the frequency range of the pattern excitation sound is recorded in the recording medium 30 in advance.

  The tire determination program 21 includes a road surface vibration acquisition unit 21a and a tire determination unit 21b. The road surface vibration acquisition unit 21a is a module that causes the control unit 20 to realize a function of acquiring road surface vibrations caused by traveling of the vehicle. That is, the vibration sensor 40 is embedded in the road surface R or attached so as to contact the road surface R so that the vibration of the road surface R generated by the vehicle traveling on the road surface R can be acquired. By traveling on the road surface around the vibration sensor 40, a signal indicating the vibration of the road surface due to the traveling of the vehicle is output from the vibration sensor 40. When a signal indicating road vibration is output from the vibration sensor 40, the signal is amplified by the amplifier 41. When the amplified signal is output from the amplifier 41, the control unit 20 acquires the amplified signal by the processing of the road surface vibration acquisition unit 21a (step S100).

  The tire determination unit 21b is a module that causes the control unit 20 to realize a function of determining whether the type of tire mounted on the vehicle is a summer tire or a winter tire based on the frequency characteristics of road surface vibration. In the present embodiment, the control unit 20 performs a frequency analysis of road surface vibration due to vehicle travel and acquires frequency characteristics of road surface vibration intensity by processing of the tire determination unit 21b (step S110). That is, the correspondence relationship between the vibration intensity of the road surface and the frequency due to traveling of the vehicle is acquired.

  Next, the control part 20 specifies the peak frequency of the road surface vibration intensity in the frequency range (for example, 200 Hz to 600 Hz) where the peak frequency of the pattern excitation sound exists by the processing of the tire determination part 21b (step). S120). That is, the control unit 20 specifies a profile in which a maximum value exists in the vibration intensity of the road surface, and the intensity tends to decrease in a band where the frequency is higher and lower than the maximum value. For example, a profile that satisfies a predetermined condition for the size and width of a peak, and a profile that has an index (for example, (size / width) × size) that is specified from the size and width of the peak is a predetermined value or more. Then, the peak frequency in the specified profile is set as the peak frequency.

  Next, the control unit 20 determines whether or not the peak frequency is included in the frequency range of the pattern excitation sound by the processing of the tire determination unit 21b (step S130). That is, the control unit 20 refers to the frequency information 30a recorded on the recording medium 30, and the peak frequency of the road surface vibration intensity due to the traveling of the vehicle is included in the frequency range of the pattern excitation sound indicated by the frequency information 30a. It is determined whether or not.

  In step S130, when it is not determined that the peak frequency is included in the frequency range of the pattern excitation sound (including the case where the peak frequency is not specified due to an unclear peak), the control unit 20 performs the tire determination unit 21b. Through this process, it is determined that summer tires are mounted on the vehicle, a control signal is output to the display unit 42, and the determination result is displayed on the display unit 42 (step S140). On the other hand, when it is determined in step S130 that the peak frequency is included in the frequency range of the pattern excitation sound, the control unit 20 determines that a winter tire is mounted on the vehicle by the processing of the tire determination unit 21b. And a control signal is output with respect to the display part 42, and the said determination result is displayed on the display part 42 (step S150). According to the above processing, it is possible to automatically and accurately determine the type of tire without relying on visual observation.

(3) Other embodiments:
The above embodiment is an example for carrying out the present invention, and various other embodiments can be adopted as long as the type of tire mounted on the vehicle is determined based on the vibration of the road surface due to the traveling of the vehicle. It is. For example, the tread pattern of the tire shown in FIGS. 1A and 1B is an example, and the ratio of the pattern main groove resonance sound component is large in the summer tire regardless of the tread pattern, and the pattern vibration sound component of the winter tire is large. The type of tire can be determined using the fact that the ratio is large.

  Further, as shown in FIGS. 1C, 2A, and 2B, the type of tire may be determined using the fact that the pattern excitation sound depends on the vehicle speed of the vehicle and the pattern main groove resonance sound does not depend on the vehicle speed of the vehicle. Is possible. In the embodiment using the vehicle speed dependency of the pattern excitation sound as described above, for example, in the configuration shown in FIG. 4, the frequency information 30a can be omitted and the vibration of the road surface due to the traveling of the vehicle traveling on the road surface R can be acquired. This can be realized by installing a plurality of vibration sensors at a plurality of positions and executing the flowchart shown in FIG. In the present embodiment, it is preferable to induce acceleration / deceleration between the positions in order to change the vehicle speed of the vehicle at each position where the vibration sensor is installed. Various configurations can be adopted as a configuration for inducing acceleration / deceleration, for example, by providing a step on the road surface or applying paint having a visual effect for inducing acceleration / deceleration on the road surface. It is possible to employ a configuration that prompts the vehicle speed of the vehicle to change.

  When the vehicle travels on the road surface R in the process shown in FIG. 7, the control unit 20 is the same at each of n positions (n is an integer of 2 or more) where the vibration sensor is installed by the process of the road surface vibration acquisition unit 21a. The vibration of the road surface due to the traveling of the vehicle is acquired (step S200). Next, by the processing of the tire determination unit 21b, the control unit 20 performs frequency analysis on the vibration of the road surface at each of the n positions, and acquires the frequency characteristics of the road surface vibration intensity for each position (step S210). .

  Next, the control part 20 specifies the peak frequency of the road surface vibration intensity for each position by the processing of the tire determination part 21b (step S220). Here, the peak frequency of each of the n positions is expressed as f (n). Next, the control unit 20 determines whether or not the peak frequency f (n) for each position matches by the processing of the tire determination unit 21b (step S230). That is, it is determined whether or not f (1) ≠ f (2)... ≠ f (n). If f (1) ≠ f (2). The frequency is assumed to be speed dependent.

  And in step S230, when it determines with the peak frequency f (n) for every position agree | coinciding, the control part 20 determines with the process of the tire determination part 21b having mounted | worn with the summer tire in the vehicle, A control signal is output to the display unit 42 to display the determination result on the display unit 42 (step S240). Of course, it is possible to determine whether or not the peak frequencies f (n) for each position coincide with each other by providing a margin corresponding to the measurement error and the fluctuation range of the pattern main groove resonance. On the other hand, if it is not determined in step S230 that the peak frequencies f (n) for each position match, the control unit 20 determines that a winter tire is mounted on the vehicle by the processing of the tire determination unit 21b, and displays. A control signal is output to the unit 42 to display the determination result on the display unit 42 (step S250). According to the above processing, it is possible to automatically determine the type of tire without relying on visual observation.

  In step S230, it is determined whether or not the peak frequency f (n) for each position matches. Of course, the peak frequency f (n) for each position changes according to the vehicle speed. The configuration may be such that the peak frequency decreases as the vehicle speed decreases.

  Furthermore, it is good also as a structure which determines with the winter tire being mounted | worn with the vehicle, when the vibration more than predetermined intensity | strength is acquired as a vibration of a road surface. That is, as shown in FIG. 3B, vibration equivalent to the pattern excitation sound is transmitted from the vehicle wearing the winter tire to the road surface, and the pattern main groove resonance is transmitted from the vehicle wearing the summer tire as shown in FIG. 3A. Vibration equivalent to sound is not transmitted to the road surface. Accordingly, the intensity of road vibration due to traveling of a vehicle wearing winter tires is large, and the intensity of road vibration due to traveling of a vehicle wearing summer tires is small. Therefore, in the configuration equivalent to that in FIG. 4, road vibration when the vehicle travels on the road surface is acquired, and when vibration of a predetermined intensity or higher is acquired in the frequency band equivalent to the pattern excitation sound, the vehicle has a winter tire. A configuration that determines that is attached may be adopted. Note that as the value of the predetermined intensity, for example, a value may be selected such that all of the vibration intensities shown in FIG.

DESCRIPTION OF SYMBOLS 10 ... Tire determination apparatus, 20 ... Control part, 21 ... Tire determination program, 21a ... Road surface vibration acquisition part, 21b ... Tire determination part, 30 ... Recording medium, 30a ... Frequency information, 40 ... Vibration sensor, 41 ... Amplifier, 42 ... Display section

Claims (8)

Road surface vibration acquisition means for acquiring road surface vibration due to running of the vehicle;
Tire determination means for determining that a winter tire is attached to the vehicle when the frequency characteristic of the road surface vibration is a frequency characteristic of road vibration caused by traveling of the vehicle on which a winter tire is attached ;
A tire determination device comprising: The tire determination means determines that the specific tire is mounted on the vehicle when the road vibration characteristic is a characteristic according to a specific tire type.
The tire determination device according to claim 1.   The tire determination means determines that a winter tire is mounted on the vehicle when a peak frequency of the vibration intensity of the road surface is included in a predetermined frequency range of the winter tire.
The tire determination apparatus according to claim 1 or 2.   The tire determination means determines that a winter tire is mounted on the vehicle when it is detected that the peak frequency of the vibration intensity of the road surface has a speed dependency.
The tire determination device according to any one of claims 1 to 3.   The speed dependency is a dependency that the peak frequency decreases as the vehicle speed of the vehicle decreases.
The tire determination device according to claim 4.   Road surface vibration acquisition means for acquiring road surface vibration due to running of the vehicle;
  Tire determination means for determining that a winter tire is mounted on the vehicle when vibration of a predetermined intensity or more is acquired as vibration of the road surface;
A tire determination device comprising: A road surface vibration acquisition step of acquiring road surface vibrations due to vehicle travel;
A tire determination step for determining that a winter tire is mounted on the vehicle when the frequency characteristic of the road surface vibration is a frequency characteristic of road vibration caused by traveling of the vehicle on which a winter tire is mounted ;
The tire judgment method containing. A road surface vibration acquisition function for acquiring road surface vibrations caused by running of the vehicle;
A tire determination function for determining that a winter tire is mounted on the vehicle when the frequency characteristic of the road surface vibration is a frequency characteristic of a road surface vibration caused by traveling of the vehicle on which a winter tire is mounted ;
Tire judgment program that makes the computer execute.

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