JP2003080912A - Abnormality detecting system of rotary body and service providing method using this system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abnormality detecting system, and a service providing method using this system capable of preventing an accident caused by failure by a reason other than reduction in internal pressure of rotary bodies, particularly, tires. SOLUTION: This abnormality detecting system is characterized by having a measuring means for measuring vibration and a sound of the rotary bodies positioned on both sides of a rotary shaft for rotating at traveling time of a moving body, an analyzing means for analyzing a frequency of the vibration and the sound from data measured by this measuring means, a discriminating means for discriminating a state of the respective rotary bodies from data analyzed by this analyzing means, and a warning means for letting a driver of the moving body know abnormality when the abnormality of the rotary bodies is detected by this discriminating means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality detection system for preventing an accident due to a failure of a rotating body (for example, a tire) and a service providing method using the abnormality detection system.

[0002]

2. Description of the Related Art As a conventional system for detecting an abnormality of a rotating body mounted on a moving body, for example, in the case of a tire mounted on a vehicle, an alarm is issued when the tire internal pressure drops below a certain value. There is a so-called internal pressure abnormality alarm system that is configured to notify the driver of an abnormality. This system is mainly configured by a system that measures an internal pressure by an internal pressure sensor attached to a wheel and issues a warning when the internal pressure falls below a certain level.

The internal pressure abnormality warning system can be said to be an effective means when a tire failure is caused by a decrease in internal pressure, but it cannot detect a tire failure caused by a reason other than the decrease in internal pressure.

Tire failures that occur due to reasons other than a decrease in internal pressure include, for example, peeling between the tread and the belt, between the cord layers forming the belt and between the side rubber and the carcass ply, breakage of the ply cord and belt cord, and tread rubber There are chunk outs (for example, the block land part provided on the tread is removed),
If you continue running with these tire failures, sudden bursts may occur and you may be unable to run,
In addition, although there is a risk of causing a major accident, no abnormality detection system is currently found that can detect the occurrence of these tire failures.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an abnormality detection system capable of preventing accidents caused by a failure of a rotating body, particularly a tire, due to a reason other than a decrease in internal pressure, and a service using the abnormality detection system. It is to propose a provision method.

[0006]

In order to solve the above-mentioned problems, the present invention provides a measuring means for measuring the vibration and sound of a rotating body in a moving body during traveling, and the measuring means for measuring the vibration and sound. Analyzing means for performing frequency analysis from the actual measurement data of vibration and sound, discriminating means for discriminating the state of each rotating body from the analytical data subjected to frequency analysis by this analyzing means, and this discriminating means An abnormality detection system for a rotating body, comprising: warning means for notifying the abnormality to the driver of the moving body when an abnormality is detected.

Further, it is preferable that the measuring means is an accelerometer for measuring vibration and a microphone for measuring sound. Furthermore, it is preferable that the analysis means for measuring vibration and sound is a fast Fourier transformer. Furthermore, it is preferable that the determination unit is a computer having a first database unit that stores data of the rotating body in a normal state. In addition, the warning means is preferably a warning light and / or an alarm.

A service providing method using the abnormality detecting system for a rotating body of the present invention is the service providing method using the abnormality detecting system for a rotating body according to any one of claims 1 to 5. In addition, if a terminal device capable of performing communication is provided and an abnormality of the rotating body is detected by the determination means of the abnormality detection system, the specific information is rotated from the terminal device via the communication management unit. The position information of the service shop that sells / repairs the body is transmitted to an information management server having a second database unit that stores in advance, and the information management server uses the database unit to position the mobile unit from the received specific information. Information on service shops in the area is extracted, and the extracted service shop information is transmitted to the terminal device through the communication management unit, Is to notify the service shop information received to the driver of the moving body. still,
More preferably, the information management server transmits the mobile unit specific information to the extracted service shop through the communication management unit.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Specific examples of embodiments of the present invention will be described below. The rotating body abnormality detection system of the present invention is a system for detecting an abnormality of a moving body, for example, a rotating body mounted on a vehicle, for example, a tire, and is mainly composed of a measuring unit, an analyzing unit, a determining unit, and a warning unit. It is configured. In addition, for convenience of description, the following description will be given.
The "moving body" and the "rotating body" are limited to the "vehicle" and the "tire", respectively, but needless to say, they are not limited thereto.

The measuring means is for measuring the vibration and sound of tires located on both sides of the axle of the running vehicle, and preferably between the wheel mounting portion of the axle and the suspension (coil spring damper). Attach it to the position. As the measuring means, specifically, it is preferable to use an accelerometer when measuring vibration, and it is preferable to use a microphone when measuring sound.

The analyzing means is for performing frequency analysis of the vibration or sound from the actual measurement data measured by the measuring means. Specifically, it is preferable to use a fast Fourier transformer as the analysis means for measuring vibrations and sounds.

The discriminating means is for discriminating whether or not each tire is in a normal state from the data subjected to the frequency analysis by the analyzing means. As the discriminating means, specifically, it is preferable to use a computer having a first database unit that stores normal data of a tire in a normal state. In addition, the computer compares the peak level of the frequency band according to the number of rotations of the tire among all the tires mounted on the vehicle, or compares it with the peak level of normal data when the tire is normal to determine whether the tire is abnormal. It is more preferable to provide an abnormality detection software capable of distinguishing.

The warning means is for notifying the driver of the vehicle of the abnormality when the determination means detects the abnormality of the tire. As the warning means, specifically, it is preferable to use a warning light and / or an alarm.

Next, a series of operations from the abnormality detecting system having the above-mentioned configuration to detecting the abnormality of the tire and notifying the abnormality to the driver will be described. FIG. 1 is a flow chart for explaining a series of operations in a tire abnormality detection system mounted on a vehicle.

In the present invention, it is necessary to measure at least one of the vibration and the sound of the tire while the vehicle is running. Here, the case of measuring only the sound will be described as an example. First, the sound of each tire while the vehicle is traveling is measured as a waveform of an electric signal by a measuring means, for example, a microphone.

Next, the electric signal waveform is Fourier-transformed by an analyzing means, for example, a fast Fourier transformer to obtain a power spectrum, and the measured data of the obtained power spectrum is discriminated by, for example, data when the tire is normal. It is sent to a computer having a first database unit that stores (normal data of power spectrum).

After that, the computer compares the actual measurement data of the power spectrum with the normal data, and when these data are significantly different, specifically, by the size of the peak.
If there is a difference of 100% or more, the tire is judged to be in an abnormal state.

By the way, in the case of a tire failure due to a reason other than a decrease in the tire internal pressure, it is general that the failure spreads to the entire tire starting from one failure site occurring in the tire, and eventually the tire is destroyed. If the tire has one faulty part, 1 for each rotation of the tire.
The vibration becomes large at the rate of the number of times, and when this vibration is subjected to frequency analysis, it has a peak in the frequency band corresponding to the number of rotations of the tire. In this case, the peak that does not exist in the normal data was detected. It may be determined that the tire is in an abnormal state.

The above-mentioned method of discriminating the abnormal state of the tire has been described by comparing it with the normal data stored in advance in the first database when the tire is normal, but as another method, it is measured at each time point. Data (eg tires
For one lap of data), comparison data measured before that (for example, data of 10 laps is averaged. If there is abnormal data, the averaging excludes the abnormal data. It is preferable to sample), and the data (waveforms) of the two data are compared to determine the abnormal state of the tire. However, the data to be compared cannot correctly determine the tire condition in a situation where a special load is applied to the axles when starting, so in such a case, the determination is not performed or even if it is performed. It is preferable to build a judgment routine such as canceling data.

When the judging means judges that the tire is in an abnormal state, the warning means, for example, a warning light or an alarm can inform the driver of the vehicle of the abnormality.

Therefore, the abnormality detection system of the present invention is
By adopting a configuration that measures changes in vibration and sound of the rotating body while the moving body is running, frequency analysis, discrimination of tire condition, and warning in case of abnormality, the driver can accurately and quickly detect the abnormality of the rotating body. Can be informed.

In particular, when the moving body is a vehicle, it is difficult for the conventional system to detect a tire failure due to a reason other than the decrease in the tire internal pressure. It is possible to detect even a tire failure due to a reason other than the decrease in the internal pressure.

Next, an example of a service providing method using the rotating body abnormality detection system of the present invention will be described. A vehicle is a terminal device for transmitting specific information including position information and information about tire failure, for example, wireless, PHS, GP.
It is necessary to have terminal devices such as mobile phones with S (Global Positioning System) function and navigation systems. The “specific information” mentioned here specifically includes a vehicle position, a vehicle type, a tire size, a mounting position of a tire in which an abnormality has occurred, and the like.

Then, when the abnormality of the tire is detected by the determining means of the abnormality detecting system, the specific information is transmitted from the terminal device. This call is preferably arranged to be made automatically.

Next, the transmitted specific information is stored in the second database unit in which the positional information of the service shop that sells and repairs tires is stored in advance via a communication management unit such as a telephone line or satellite communication. The information management server has a notification, for example, a tire service network.

Upon receiving the notification, the information management server extracts the information of the service shop in the area where the vehicle is located using the database section, and transmits the extracted service shop information through the communication management section.

Then, the transmitted service shop information is received by the terminal device, the received service shop information is notified to the driver by the information transmission means equipped in the vehicle, and the driver is notified by the notified information. Since it is possible to easily know the nearest service shop, for example, a tire shop or a tire repair shop, it is possible to quickly go straight to the nearest service shop.

The information transmission means may be a display means such as a monitor or an acoustic means such as a voice. Particularly, in the case of a vehicle equipped with a navigation system, the location of the nearest service shop is mapped. It can also be displayed with.

The information management server can also transmit the vehicle specific information to the extracted nearest service shop through the communication management unit. In this case, the service is provided before the vehicle arrives at the service shop. There is an advantage that the shop worker can prepare for tire repair.

The above is merely a representative example of the embodiments of the present invention, and various modifications can be made within the scope of the claims.

[0031]

According to the abnormality detection system of the present invention,
By measuring the vibration and sound changes of the rotating body mounted on the moving body while driving, frequency analysis, discrimination of tire condition and warning in case of abnormality, it is possible to accurately inform the driver of abnormality of the rotating body. I can inform you.
In particular, when the moving body is a vehicle, in the conventional system, it was difficult to detect a tire failure due to a reason other than the decrease in the internal pressure of the tire. It is possible to prevent accidents due to breakdowns for reasons other than deterioration.

Further, according to the service providing method using the abnormality detection system of the present invention, when a failure occurs in the rotating body, it is possible to promptly notify the driver of the nearest service shop. Can go directly to the nearest service shop to quickly replace or repair the rotating body.

[Brief description of drawings]

FIG. 1 is a flowchart for explaining a series of operations in a tire abnormality detection system mounted on a vehicle.

Claims (7)

[Claims] 1. A measuring means for measuring vibration and sound of a rotating body in a moving moving body, and an analyzing means for performing frequency analysis from the measured data of the vibration and sound measured by the measuring means. , A discriminating means for discriminating the state of each rotating body from the analysis data subjected to frequency analysis by this analyzing means, and when an abnormality of the rotating body is detected by this discriminating means,
An abnormality detection system for a rotating body, comprising: a warning unit for notifying the driver of the moving body of an abnormality. 2. The abnormality detecting system for a rotating body according to claim 1, wherein the measuring means for measuring the vibration is an accelerometer, and the measuring means for measuring the sound is a microphone. 3. The rotating body abnormality detection system according to claim 1, wherein the analyzing means for performing frequency analysis of vibrations and sounds is a fast Fourier transformer. 4. The rotating body abnormality detecting system according to claim 1, wherein the discriminating means is a computer having a first database unit that stores data of the rotating body when the rotating body is normal. 5. The rotating body abnormality detection system according to claim 1, wherein the warning means is a warning light and / or an alarm. 6. A service providing method using the rotating body abnormality detection system according to claim 1, wherein the moving body is provided with a terminal device capable of communicating, and the abnormality detection is performed. When the abnormality of the rotating body is detected by the determination means of the system, the specific information from the terminal device,
The position information of the service shop that sells and repairs the rotating body is transmitted to the information management server having the second database unit that stores in advance via the communication management unit, and the information management server determines the database unit from the received specific information. The information of the service shop in the area where the mobile body is located is extracted using the extracted service shop information, and the extracted service shop information is transmitted to the terminal device through the communication management unit, and the terminal device receives the received service shop information. A method of providing a service using a rotating body abnormality detection system, characterized by notifying a driver of a moving body. 7. The service providing method using the abnormality detecting system for a rotating body according to claim 6, wherein the information management server transmits the specific information of the moving body to the extracted service shop through the communication management unit.