JP6340982B2 - Road surface deterioration detection program, deterioration detection method, and deterioration detection apparatus - Google Patents

Description

  The present invention relates to a road surface deterioration detection program, a deterioration detection method, and a deterioration detection apparatus.

  Conventionally, a technique for acquiring a value of a sensor provided in a vehicle and detecting a road surface state based on the acquired value is known (see, for example, Patent Documents 1 to 3).

JP 2005-115687 A Japanese Patent Laid-Open No. 9-20223 JP 61-37515 A

  However, the above Patent Documents 1 to 3 and the like do not disclose detection of deterioration in which fine irregularities such as cracks generated on the road surface continue. For this reason, even if the above Patent Documents 1 to 3 and the like are used, it is impossible to detect deterioration in which fine irregularities such as cracks generated on the road surface continue.

  In one aspect, an object of the present invention is to provide a road surface deterioration detection program, a deterioration detection method, and a deterioration detection device capable of detecting deterioration in which fine unevenness such as cracks existing on the road surface continues. And

In one aspect, the road surface deterioration detection program includes a waveform portion that vibrates in a cycle shorter than a predetermined reference cycle among waveforms indicating a time-series change in measurement values measured by an acceleration sensor mounted on a vehicle. When the distance on the road surface corresponding to the specified waveform portion is equal to or greater than a predetermined distance, or the time when the first measurement value included in the specified waveform portion was obtained and the last measurement value were obtained A road surface deterioration detection program for causing a computer to execute a process of detecting a section on the road surface corresponding to the specified waveform portion as a road surface deterioration section when the time between the time is a predetermined time or more .

In one aspect, the road surface deterioration detection method includes a waveform portion that vibrates at a period shorter than a predetermined reference period, out of waveforms indicating a time-series change in measured values measured by an acceleration sensor mounted on a vehicle. And when the distance on the road surface corresponding to the specified waveform portion is equal to or greater than a predetermined distance, or the time when the first measurement value included in the specified waveform portion is obtained and the last measurement value are obtained. A road surface deterioration detection method in which a computer executes a process of detecting a section on the road surface corresponding to the specified waveform portion as a road surface deterioration section when the time between the specified time and the predetermined time is a predetermined time or more It is.

In one aspect, the road surface degradation detection device includes a waveform portion that vibrates in a cycle shorter than a predetermined reference cycle among waveforms indicating time-series changes in measurement values measured by an acceleration sensor mounted on a vehicle. And when the distance on the road surface corresponding to the waveform portion specified by the specification portion is equal to or greater than a predetermined distance, or when the first measurement value included in the specified waveform portion is obtained and last And a detection unit that detects a section on the road surface corresponding to the specified waveform portion as a road surface deterioration section when the time between the time when the measured value is obtained is a predetermined time or more . .

  It is possible to detect deterioration in which fine irregularities such as cracks existing on the road surface continue.

FIG. 1A is a diagram schematically illustrating a configuration of a road surface deterioration detection system according to an embodiment, and FIG. 1B is a diagram illustrating a state in which a mobile terminal is mounted on a dashboard of a vehicle. . 2A is a diagram illustrating a hardware configuration of the mobile terminal, and FIG. 2B is a diagram illustrating a hardware configuration of the control device in FIG. 2A. It is a functional block diagram of a portable terminal and an office terminal. It is a figure which shows an example of the data structure of driving | running | working DB. It is a figure which shows the hardware constitutions of an office terminal. It is a flowchart which shows the process of a degradation location estimation part. FIG. 7A is a diagram showing an example of time-series data of vertical acceleration, and FIG. 7B is an enlarged view of a part of time-series data of vertical acceleration. It is a figure which shows a work table. FIG. 9A is a diagram illustrating an example of the data structure of the deterioration point DB, and FIG. 9B is a diagram illustrating an example of the data structure of the deterioration section DB.

  Hereinafter, an embodiment of a road surface deterioration detection system will be described in detail with reference to FIGS.

  FIG. 1A schematically shows a configuration of a road surface deterioration detection system 100 according to an embodiment. As shown in FIG. 1A, a road surface deterioration detection system 100 includes a mobile terminal 10 and an office terminal 50 as a road surface deterioration detection device. The mobile terminal 10 can communicate with a base station 70 connected to a network 80 such as the Internet. The office terminal 50 is connected to the network 80.

  The mobile terminal 10 is a terminal such as a mobile phone or a smartphone, and is used for detecting a degraded part of the road surface. When the mobile terminal 10 is used for detecting a deteriorated portion of the road surface, it is placed on the dashboard of the vehicle as shown in FIG. The mobile terminal 10 acquires various information while the vehicle is traveling, and transmits the acquired information to the office terminal 50.

  FIG. 2A shows a hardware configuration of the mobile terminal 10. As shown in FIG. 2A, the mobile terminal 10 includes a display unit 11, an input unit 13, an acceleration sensor 15, a GPS (Global Positioning System) module 17, a communication unit 19, a control device 20, and the like.

  The display unit 11 includes a liquid crystal display, an organic EL (Electro-Luminescence) display, and the like, and displays various types of information under instructions from the control device 20. The input unit 13 includes a touch panel and a keyboard, and is used by the user to input various information.

  The acceleration sensor 15 is a sensor that can detect the acceleration in the triaxial direction that acts on the mobile terminal 10. Here, the acceleration sensor 15 is an acceleration (longitudinal acceleration) in a direction perpendicular to the screen of the display unit 11 when the mobile terminal 10 is mounted in the vehicle as shown in FIG. The horizontal acceleration (horizontal acceleration) of the screen and the vertical acceleration (vertical acceleration) of the screen of the display unit 11 can be detected. In the case where the mobile terminal 10 detects a deteriorated portion of the road surface, the acceleration sensor 15 acquires triaxial acceleration at, for example, 0.1 second intervals. In the present embodiment, since only the vertical acceleration is used for the determination, the acceleration sensor 15 may not be able to measure the longitudinal acceleration and the lateral acceleration.

  The GPS module 17 receives GPS data from GPS satellites, and acquires position information of the mobile terminal 10, here latitude and longitude, at predetermined time intervals. In the case where the mobile terminal 10 detects a deteriorated portion of the road surface, the GPS module 17 acquires position information of the vehicle on which the mobile terminal 10 is installed, for example, at intervals of 0.1 seconds.

  The communication unit 19 communicates with the office terminal 50 via the base station 70 and the network 80 illustrated in FIG.

  The control device 20 comprehensively controls the operation of each unit of the mobile terminal 10. FIG. 2B shows the hardware configuration of the control device 20. As shown in FIG. 2B, the control device 20 includes a CPU (Central Processing Unit) 90, a ROM (Read Only Memory) 92, a RAM (Random Access Memory) 94, and a storage unit (here, an HDD (Hard Disk Drive)). 96), an input / output interface 97, and the like. Each component of the control device 20 is connected to the bus 98. The input / output interface 97 is connected to each unit, each sensor, and the like shown in FIG. In the control device 20, the functions of the information acquisition unit 22, the time acquisition unit 24, and the information transmission unit 26 illustrated in FIG. 3 are realized by the CPU 90 executing a program stored in the ROM 92 or the HDD 96. FIG. 3 also shows the travel DB 30 stored in the HDD 96 or the like.

  The information acquisition unit 22 acquires the detection results of the longitudinal acceleration, the lateral acceleration, and the vertical acceleration from the acceleration sensor 15 every predetermined time (for example, every 0.1 second) when detecting the deterioration of the road surface. In addition, when the road surface deterioration is detected, the information acquisition unit 22 receives the position information of the mobile terminal 10 from the GPS module 17 every predetermined time (for example, every 0.1 second), that is, the vehicle on which the mobile terminal 10 is mounted. Get location information. The information acquisition unit 22 stores the acquired information in the travel DB 30.

  The time acquisition unit 24 cooperates with the information acquisition unit 22 to acquire information on the date and time when the information acquisition unit 22 acquired information from the acceleration sensor 15 and the GPS module 17 and stores the information in the travel DB 30.

  FIG. 4 shows an example of the data structure of the travel DB 30. As shown in FIG. 4, the travel DB 30 has fields of “date”, “time”, “latitude”, “longitude”, “longitudinal acceleration”, “lateral acceleration”, and “vertical acceleration”.

In the “date” and “time” fields, date information and time information acquired by the time acquisition unit 24 are stored. When the time is “T134102.302”, it means “13:41:02 302”. In the “latitude” and “longitude” fields, position information acquired from the GPS module 17 by the information acquisition unit 22 is stored. In the “longitudinal acceleration”, “left / right acceleration”, and “vertical acceleration” fields, information on acceleration acquired by the information acquisition unit 22 from the acceleration sensor 15 is stored. The “vertical acceleration” is a value including gravitational acceleration (9.81 m / s ² ).

  Returning to FIG. 3, the information transmission unit 26 transmits the information accumulated in the travel DB 30 to the office terminal 50 through the communication unit 19 at the timing when the road surface information acquisition is completed in the mobile terminal 10.

  Returning to FIG. 1A, the office terminal 50 is a terminal such as a PC (Personal Computer) installed in an office such as a company or a public institution that performs a work for detecting a deteriorated portion of a road surface. FIG. 5 shows a hardware configuration of the office terminal 50. As shown in FIG. 5, the office terminal 50 includes a CPU 190, a ROM 192, a RAM 194, a storage unit (HDD) 196, a network interface 197, a display unit 193, an input unit 195, a portable storage medium drive 199, and the like. Yes. Each component of the office terminal 50 is connected to the bus 198. The display unit 193 includes a liquid crystal display and the like, and the input unit 195 includes a keyboard and a mouse. In the office terminal 50, a program (including a road surface deterioration detection program) stored in the ROM 192 or the HDD 196, or a program (a road surface deterioration detection program) read from the portable storage medium 191 by the portable storage medium drive 199. 3) is implemented, the functions of the information receiving unit 52, the specifying part and the degradation point estimating unit 54 as the detecting unit, and the information displaying unit 56 shown in FIG. 3 are realized. 3 also shows a work table 60, a deterioration point DB 62, and a deterioration section DB 64 stored in the HDD 196 or the like.

  The information receiving unit 52 receives information stored in the travel DB 30 transmitted from the mobile terminal 10 side, and transmits the information to the deterioration point calculating unit 54.

  The degradation point estimation unit 54 analyzes information accumulated in the travel DB 30 and estimates a degradation point and a degradation section as degradation points on the road surface. Here, it is assumed that the “deterioration point” is a place where a relatively large hole or depression (for example, a hole or depression having a size of about 30 cm to 50 cm) is opened on the road surface. Therefore, when the vehicle passes over the “deterioration point”, the absolute value of the value obtained by subtracting the gravitational acceleration from the vertical acceleration acquired by the acceleration sensor 15 is larger than a predetermined value (referred to as a deterioration threshold). growing. On the other hand, the “deterioration section” is a section on the road surface that is determined to be totally deteriorated as a result of overall determination of the deterioration state of each point in the section ranging from several tens of meters to several hundred meters, for example. It is. When the vehicle passes over the “degradation section”, the absolute value of the value obtained by subtracting the gravitational acceleration from the vertical acceleration acquired by the acceleration sensor 15 is not as large as the degradation point, but is a fine vibration with a period of about 0.1 seconds. Appear continuously over several meters to several tens of meters in distance. The degradation point estimation unit 54 stores the degradation point and degradation zone estimation results in the degradation point DB 62 and the degradation zone DB 64. Here, the deterioration point DB 62 has a data structure as shown in FIG. 9A, and stores information on the latitude and longitude of the point estimated as the deterioration point. The degradation section DB 64 has a data structure as shown in FIG. 9B, and stores information on the latitude and longitude of the start point and end point of the section estimated as the degradation section. The specific process of the degradation point estimation unit 54 will be described later. Details of the work table 60 used in the process by the degradation point estimation unit 54 will also be described later.

  Returning to FIG. 3, the information display unit 56 creates a screen for displaying the deterioration point and the deterioration section based on the estimation result stored in the deterioration point DB 62 and the deterioration section DB 64, and displays the screen on the office terminal 50. Is displayed on the display unit 193.

  Next, the process of the degradation location estimation part 54 is demonstrated in detail along the flowchart of FIG.

  In addition, as a premise that the process of FIG. 6 is performed, the user who detects the deterioration of the road travels on the road with a vehicle in which the portable terminal 10 is mounted on the dashboard as illustrated in FIG. During this travel, the mobile terminal 10 acquires acceleration information and position information at a predetermined time interval (for example, every 0.1 second) and accumulates them in the travel DB 30. Then, when the user inputs that the traveling has ended, the data accumulated in the traveling DB 30 is transmitted from the information transmitting unit 26 of the portable terminal 10 to the information receiving unit 52 of the office terminal 50.

  In this way, when the information receiving unit 52 receives the data stored in the travel DB 30, the process of FIG.

In the process of FIG. 6, first, in step S10, the degradation point estimation unit 54 includes the first vertical acceleration value and the corresponding latitude and longitude among the data of the travel DB 30 transmitted from the mobile terminal 10 side. Get information about. Here, the degradation point estimation unit 54 acquires a value obtained by subtracting the gravity acceleration 9.81 (m / s ² ) from the value of the “vertical acceleration” field in FIG. 4 as the vertical acceleration value. . Hereinafter, the expression “vertical acceleration” means a value obtained by subtracting the gravitational acceleration from the actual vertical acceleration.

  The degradation point estimation unit 54 stores the acquired vertical acceleration value and the corresponding latitude and longitude information in the work table 60. Here, the work table 60 temporarily stores various kinds of information necessary for estimating the deterioration section, and has a data structure as shown in FIG. 8 as an example. In step S <b> 10, the degradation point estimation unit 54 stores the acquired information in the “immediate vertical acceleration”, “immediate latitude”, and “immediate longitude” columns.

Next, in step S12, the degradation point estimation unit 54 determines whether or not the absolute value of the acquired vertical acceleration is equal to or greater than a degradation threshold. Here, the deterioration threshold value is a threshold value used for determining whether or not a deterioration point, that is, a point where a relatively large hole or depression exists on the road surface. FIG. 7A shows an example of a waveform indicating a time-series change in vertical acceleration. In FIG. 7A, the absolute value | 0.5 (m / s ² ) | indicated by the broken line is adopted as the deterioration threshold value. In this case, in step S12, it is determined whether or not the absolute value of the acquired vertical acceleration exceeds the deterioration threshold value | 0.5 (m / s ² ) | as shown at point A in FIG.

  If the determination in step S12 is affirmative, that is, if the absolute value of the vertical acceleration is equal to or greater than the deterioration threshold as at point A in FIG. 7A, the deterioration point estimation unit 54 proceeds to step S14. . In step S <b> 14, the degradation point estimation unit 54 estimates a point where the vertical acceleration is acquired as a “degradation point”. And the degradation location estimation part 54 stores the latitude and longitude information of a degradation location in the degradation location DB62 shown to Fig.9 (a).

  On the other hand, when the acquired absolute value of the vertical acceleration is not equal to or greater than the deterioration threshold value and the determination in step S12 is negative, the deterioration point estimating unit 54 proceeds to step S16. In step S <b> 16, the degradation point estimation unit 54 records the point at which the vertical acceleration is acquired in the work table 60 as the first point. Specifically, the degradation point estimation unit 54 records the latitude / longitude information corresponding to the vertical acceleration acquired in step S <b> 10 in the “first place” field of the work table 60.

  Next, in step S18, the degradation point estimation unit 54 resets the continuous distance counter. That is, the degradation point estimation unit 54 sets the value in the “continuous distance counter” column of the work table 60 in FIG. 8 to “0 (m)”.

  Next, in step S20, the degradation point estimation unit 54 acquires the next vertical acceleration value and the corresponding latitude and longitude values. That is, the value of the vertical acceleration detected by the acceleration sensor 15 is acquired next to the vertical acceleration acquired immediately before.

  Next, in step S22, the degradation point estimation unit 54 determines whether or not the absolute value of the acquired vertical acceleration is equal to or greater than a degradation threshold. Here, the degradation point estimation part 54 performs the same determination as step S12 mentioned above. If the determination in step S22 is affirmed, the degradation point estimation unit 54 proceeds to step S14. And in step S14, the degradation location estimation part 54 estimates the point which acquired the vertical acceleration as a "degradation location", stores the latitude / longitude information in the degradation location DB62, and returns to step S10. On the other hand, if the determination in step S22 is negative, the process proceeds to step S24.

When the process proceeds to step S <b> 24, the degradation point estimation unit 54 determines whether the difference from the immediately preceding vertical acceleration obtained from the work table 60 is greater than or equal to the reference acceleration width. Here, the reference acceleration width means a threshold value for determining that a minute vertical movement has occurred. In the present embodiment, as an example, the reference acceleration width is assumed to be 0.3 m / s ² . For example, as shown in an enlarged view in FIG. 7B, it is assumed that the value of the vertical acceleration acquired immediately before is a, and the value of the vertical acceleration acquired this time is b. In this case, if | b−a | ≧ 0.3 is not satisfied (No at Step S24), it is determined that a minute vertical movement has not occurred, that is, the vehicle has not passed through the deterioration section, and the deterioration portion is estimated. The unit 54 proceeds to step S32. On the other hand, when | b−a | ≧ 0.3 is satisfied (step S24: affirmative), it is determined that there is a possibility that the vehicle has passed through the deterioration zone because a minute vertical movement has occurred. The part estimation part 54 transfers to step S26.

  When the determination in step S24 is affirmed and the process proceeds to step S26, the degradation point estimation unit 54 determines whether the value has increased or decreased compared to the vertical acceleration acquired immediately before. For example, in the case where the vertical acceleration a in FIG. 7B is the acceleration acquired immediately before and the vertical acceleration b is the acceleration acquired this time, the value is increased, so that it is determined as “up”.

  Next, in step S28, the degradation point estimation unit 54 refers to the work table 60, calculates the movement distance, and adds it to the continuous distance counter. Specifically, the degradation point estimation unit 54 stores information on “latitude just before” and “longitude just before” recorded in the work table 60, and information on latitude and longitude of the point corresponding to the vertical acceleration acquired this time. Is used to calculate the distance between two points. The degradation point estimation unit 54 adds the calculated distance value to the value recorded in the continuous distance counter column of the work table 60.

  Next, in step S30, the degradation point estimation unit 54 determines whether or not it is different from the recording of the change from immediately before. When the process of step S30 is performed for the first time after the process of FIG. 6 is started, the “change from immediately before” column of the work table 60 is blank. In this case, the determination in step S30 is unconditionally affirmed. If the determination in step S30 is affirmed, the degradation point estimation unit 54 proceeds to step S31. In step S31, the degradation point estimation unit 54 obtains the values of the vertical acceleration acquired in step S20 and the corresponding latitude and longitude information from the “previous vertical acceleration”, “previous latitude”, and “previous latitude” in the work table 60. Record (rewrite) in the "Longitude" field. Further, the degradation point estimation unit 54 records the determination result (“rise” or “fall”) in step S26 in the “change from immediately before” column. Thereafter, the process returns to step S20.

  After returning to step S20, the processes and determinations of steps S20 to S31 are repeated. During this repetition, the movement distance calculated in step S28 is added to the “continuous distance counter” field of the work table 60 in FIG. In the work table 60, the “immediately vertical acceleration”, “immediate latitude”, “immediate longitude”, and “change from previous” column are updated with the information newly acquired in step S20.

  Then, the process proceeds to step S32 when the determination of step S24 is denied or when the determination of step S30 is denied.

  Note that the determination in step S24 is denied when the up-and-down swing generated in the mobile terminal 10 becomes gentler than when the road surface is degraded such as cracks. Therefore, if the determination in step S24 is negative, it means that the vehicle has already passed the deterioration zone.

  The determination in step S30 is denied when, for example, the change in vertical acceleration continues as “up” and “up” as in the vertical accelerations c to e shown in FIG. ”And“ Descent ”. Thus, when the change in the vertical acceleration continues as “rise”, “rise”, etc., it means that the vertical movement, that is, the period of vibration exceeds the acceleration acquisition interval (0.1 seconds). In the present embodiment, the acceleration acquisition interval (0.1 seconds) is used as a road surface deterioration detection reference, and the vertical movement period is shorter than a predetermined vibration cycle (for example, 5 Hz) determined by the road surface deterioration detection reference. (Waveform portion) is extracted as a candidate for a deterioration section. Therefore, if the determination in step S30 is negative, it means that the vehicle has already passed the deterioration zone.

  When the determination in step S24 or S30 is negative and the process proceeds to step S32, the degradation point estimation unit 54 determines whether or not the continuous distance counter is equal to or greater than the minimum continuous distance. Here, the minimum continuous distance means the smallest dimension among the sizes to be recognized as cracks on the road surface, for example, 3 m. Therefore, if the value input in the “continuous distance counter” field of the work table 60 is 3 m or more, the degradation point estimation unit 54 proceeds to step S34.

In step S <b> 34, the degradation point estimation unit 54 estimates a section from the first point to a point corresponding to the vertical acceleration acquired immediately before as a “degradation section”. In this case, the degradation point estimation unit 54 sets the first point recorded in the work table 60 as the “start point” and the point corresponding to the vertical acceleration acquired immediately before as the “end point”. Information is stored in the deterioration section DB 64. As described above, in this embodiment, the degradation point estimation unit 54 has the absolute value of the vertical acceleration equal to or lower than the degradation threshold (| 0.5 m / s ² |), and the difference from the latest vertical acceleration is the reference acceleration width ( 0.3 m / s ² ) or less, and a waveform portion in which the value of the vertical acceleration repeatedly rises and falls in a cycle shorter than a predetermined vibration cycle defined by the deterioration detection standard (0.1 second) is specified. Then, when the specified waveform portion continues for the minimum continuous distance (3 m) or longer, the degradation point estimation unit 54 estimates a section corresponding to the waveform portion as a road surface degradation section.

  On the other hand, if the determination in step S32 is negative, the degradation point estimation unit 54 is not a degradation segment from the first point recorded in the work table 60 to the point corresponding to the vertical acceleration acquired immediately before. Estimated.

  After the process of step S34 or S36 mentioned above is complete | finished, it transfers to step S38 and the degradation location estimation part 54 judges whether all the vertical accelerations have been acquired. If the determination here is negative, the process proceeds to step S40, and the degradation point estimation unit 54 resets by deleting the values in all the columns of the work table 60, and returns to step S10. Then, after step S10, the same processing as described above is executed, and when the determination in step S38 is affirmed, that is, when it is determined that all the vertical accelerations have been acquired, all of FIG. The process ends.

  The information display unit 56 of the office terminal 50 stores information stored in the deterioration point DB 62 and the deterioration section DB 64 at the timing when the processing of FIG. 6 is completed or in response to a request from the user of the office terminal 50. Is displayed on the display unit 193. In this case, the information display unit 56 may display the deterioration point DB 62 and the deterioration section DB 64 itself, or may display the points and sections stored in the deterioration point DB 62 and the deterioration section DB 64 on a map. In addition, when a degradation point and a degradation area are displayed on a map, there exists an advantage that it is easy to specify the location of a degradation point or a degradation area.

  As described above in detail, according to the present embodiment, the degradation point estimation unit 54 has a waveform indicating a time-series change in the measurement value measured by the acceleration sensor 15 of the mobile terminal 10 mounted on the vehicle. Among them, a waveform portion that vibrates at an acceleration acquisition interval (0.1 s) as a deterioration detection reference is specified (S10 to S31), and road surface deterioration is detected in the specified portion (S32, S34). Thereby, in this embodiment, it becomes possible to detect deterioration in which fine unevenness continues, such as a turtle-shaped crack, among the deterioration of the road surface.

  Further, in the present embodiment, the position information is acquired from the GPS module 17 at the timing of acquiring the acceleration from the acceleration sensor 15, and the position of the deteriorated portion of the road surface is specified based on the acquired position information. Thereby, the positional information on a degradation location can be provided to the user of the office terminal 50.

  In the present embodiment, since the waveform portion whose absolute value of vertical acceleration does not exceed the deterioration threshold (absolute value 0.5) is specified as the deterioration section, the deterioration point and the deterioration section can be detected separately (see FIG. 9).

  Moreover, in this embodiment, since a degradation area is detected using the minimum continuous distance (3 m), it is possible not to detect a section that is less likely to be a crack than a minimum continuous distance as a degradation area.

  In addition, although the said embodiment demonstrated the case where the portable terminal 10 was mounted in a vehicle and the degradation location of a road surface was detected, it is not restricted to this. For example, instead of the mobile terminal 10, a digital tachometer (digital tachograph) mounted in advance on the vehicle may be used. As described above, even when a digital octopus is used, since acceleration and position information can be acquired by the digital octopus, the same effects as in the above embodiment can be obtained.

  In addition, although the said embodiment demonstrated the case where a degradation area was estimated using a degradation threshold value, reference | standard acceleration width | variety, and the minimum continuous distance, it is not restricted to this. The deterioration section may be estimated using at least one of the deterioration threshold value, the reference acceleration width, and the minimum continuous distance.

  In the above embodiment, the case where the deterioration threshold, the reference acceleration width, and the deterioration detection reference are fixed values has been described. However, the present invention is not limited to this. For example, the deterioration threshold value, the reference acceleration width, and the deterioration detection reference value may be changed according to the vehicle speed and the longitudinal acceleration value.

  In the above-described embodiment, the case has been described in which the degradation point estimation unit 54 determines whether or not the degradation section is based on whether or not the continuous distance counter is equal to or greater than the minimum continuous distance in step S32 of FIG. However, it is not limited to this. For example, the degradation point estimation unit degrades based on whether the time between the time when the vertical acceleration is acquired at the first point and the time corresponding to the vertical acceleration acquired immediately before is a predetermined time or more. It is good also as judging whether it is a section.

  In the above-described embodiment, the degradation point estimation unit 54 has described the case where the distance between the points where the acceleration is acquired is calculated from the information on the latitude and longitude detected by the GPS module 17, but the present invention is not limited to this. Absent. For example, the degradation point estimation unit 54 may calculate the distance between the points where the acceleration is acquired using the value of the longitudinal acceleration and the time.

  In the above-described embodiment, the case has been described in which the deterioration section is estimated in the office terminal, but the present invention is not limited to this. For example, the deterioration section may be estimated by executing the process of FIG. Or the server (cloud) which received the data accumulate | stored in driving | running | working DB30 from the portable terminal 10 performs the process of FIG. 6, estimates a degradation area, and transmits an estimation result to the office terminal 50 or the portable terminal 10. It is good as well. In this case, for example, the office terminal 50 may use the measurement result via a browser or the like.

  The above processing functions can be realized by a computer. In that case, a program describing the processing contents of the functions that the processing apparatus should have is provided. By executing the program on a computer, the above processing functions are realized on the computer. The program describing the processing contents can be recorded on a computer-readable recording medium (except for a carrier wave).

  When the program is distributed, for example, it is sold in the form of a portable recording medium such as a DVD (Digital Versatile Disc) or a CD-ROM (Compact Disc Read Only Memory) on which the program is recorded. It is also possible to store the program in a storage device of a server computer and transfer the program from the server computer to another computer via a network.

  The computer that executes the program stores, for example, the program recorded on the portable recording medium or the program transferred from the server computer in its own storage device. Then, the computer reads the program from its own storage device and executes processing according to the program. The computer can also read the program directly from the portable recording medium and execute processing according to the program. Further, each time the program is transferred from the server computer, the computer can sequentially execute processing according to the received program.

  The above-described embodiment is an example of a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

In addition, the following additional remarks are disclosed regarding description of the above embodiment.
(Supplementary note 1) Among the waveforms showing the time-series changes of the measured values measured by the acceleration sensor mounted on the vehicle, the waveform portion that vibrates in a cycle shorter than a predetermined reference cycle is specified,
Detecting deterioration of the road surface in the identified waveform portion;
A road surface deterioration detection program which causes a computer to execute processing.
(Additional remark 2) In the process to specify, the waveform part which vibrates with a period shorter than the predetermined reference period is specified, while the measured value maintains a predetermined range, The road surface of Additional remark 1 characterized by the above-mentioned Deterioration detection program.
(Additional remark 3) In the process which detects the deterioration of the said road surface, the deterioration on a road surface is detected based on the distance on the said road surface corresponding to the specified said waveform part, or the time required to acquire the specified said waveform part. The road surface deterioration detection program according to appendix 1 or 2, characterized in that:
(Additional remark 4) The process which specifies the waveform part which vibrates with a period shorter than a predetermined | prescribed reference period among the waveforms which show the time-sequential change of the measured value measured by the acceleration sensor mounted in the vehicle,
Processing to detect road surface deterioration in the identified waveform portion;
A method for detecting deterioration of a road surface, characterized in that a computer is executed.
(Supplementary Note 5) In the specifying process, a waveform portion that vibrates at a period shorter than the predetermined reference period is specified while the measured value is maintained within a predetermined range. Degradation detection method.
(Additional remark 6) In the process which detects the deterioration of the said road surface, the deterioration on a road surface is detected based on the distance on the said road surface corresponding to the specified said waveform part, or the time required to acquire the specified said waveform part The road surface deterioration detection method according to appendix 4 or 5, characterized in that:
(Additional remark 7) The specific part which pinpoints the waveform part which vibrates with a period shorter than a predetermined | prescribed reference period among the waveforms which show the time-sequential change of the measured value measured by the acceleration sensor mounted in the vehicle,
A detection unit for detecting road surface deterioration in the waveform portion specified by the specifying unit;
A road surface degradation detection device comprising:
(Additional remark 8) The said specific | specification part specifies the waveform part which vibrates with a period shorter than the said predetermined reference period, maintaining the said measured value in a predetermined range, The road surface deterioration of Additional remark 7 characterized by the above-mentioned. Detection device.
(Additional remark 9) The said detection part detects the deterioration of a road surface based on the distance on the said road surface corresponding to the specified said waveform part, or the time required to acquire the specified said waveform part, It is characterized by the above-mentioned. The road surface deterioration detection device according to appendix 7 or 8.

15 Acceleration sensor 50 Office terminal (Road surface deterioration detection device)
54 Deterioration location estimation unit (specification unit, detection unit)

Claims (4)

Among the waveforms showing the time-series changes of the measurement values measured by the acceleration sensor mounted on the vehicle, identify the waveform portion that vibrates in a cycle shorter than a predetermined reference cycle,
When the distance on the road surface corresponding to the specified waveform portion is a predetermined distance or more, or between the time when the first measurement value included in the specified waveform portion was obtained and the time when the last measurement value was obtained When the time is equal to or longer than a predetermined time, a section on the road surface corresponding to the specified waveform portion is detected as a road surface deterioration section .
A road surface deterioration detection program which causes a computer to execute processing.   The road surface deterioration detection program according to claim 1, wherein, in the specifying process, a waveform portion that vibrates in a cycle shorter than the predetermined reference cycle while the measured value is maintained in a predetermined range is specified. . A process of identifying a waveform portion that vibrates in a cycle shorter than a predetermined reference cycle out of waveforms indicating a time-series change in measurement values measured by an acceleration sensor mounted on the vehicle;
When the distance on the road surface corresponding to the specified waveform portion is a predetermined distance or more, or between the time when the first measurement value included in the specified waveform portion was obtained and the time when the last measurement value was obtained When the time is equal to or longer than a predetermined time, a process for detecting a section on the road surface corresponding to the identified waveform portion as a road surface deterioration section ,
A method for detecting deterioration of a road surface, characterized in that a computer is executed. A specifying unit for specifying a waveform portion that vibrates in a cycle shorter than a predetermined reference cycle out of waveforms indicating a time-series change in measurement values measured by an acceleration sensor mounted on the vehicle;
When the distance on the road surface corresponding to the waveform portion specified by the specifying unit is a predetermined distance or more, or the time when the first measurement value included in the specified waveform portion was obtained and the last measurement value were obtained. A detection unit that detects a section on the road surface corresponding to the specified waveform portion as a road surface deterioration section when the time between the time is a predetermined time or more ;
A road surface degradation detection device comprising:

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