JP2015075934A - Correction processing program, correction processing method, and correction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a correction processing program, a correction processing method, and a correction device which can correct a measurement value of a sensor.SOLUTION: A vehicle 15B is equipped with a sensor which detects vibration. When reference positions A to C stored in a storage unit are included in a travel route indicated by travel data of the vehicle 15B that is acquired in travel of the vehicle 15B, a correction device performs correction of a measurement value of the sensor on the basis of differences between reference vibration detection values at the reference positions A to C stored in association with the reference positions A to C in the storage unit, and deviation detection values detected by the sensor at positions A to C corresponding to the reference positions of the vehicle 15B.

Description

  The present invention relates to a correction processing program, a correction processing method, and a correction apparatus.

  A technology that detects pavement deterioration by attaching a sensor that detects vibration to the vehicle and running on the road, and determining that the road pavement has deteriorated at a location where a sensor value greater than a certain value is detected. is there. An example of a sensor that detects such shaking is an acceleration sensor.

JP 2009-281799 A

  However, in the above technique, when pavement deterioration is detected in a plurality of vehicles, the detection value of the shake detected by the sensor varies depending on differences in the vehicle, tires, number of passengers, speed, and the like. Depending on the change in the detected value, there may be a case where pavement deterioration cannot be detected, or it may be detected that the pavement has deteriorated even when traveling on a pavement that has not deteriorated.

  An object of one aspect is to provide a correction processing program, a correction processing method, and a correction device that can calibrate a sensor value.

  According to one aspect of the present invention, the correction processing program includes the reference position stored in the storage unit in the travel route indicated by the travel data of the vehicle that is obtained by travel of the vehicle on which the sensor that detects shaking is mounted. The computer executes the following processing. The correction processing program stores a reference shake detection value at the reference position stored in the storage unit in association with the reference position and a shake detection value detected by the sensor at a position corresponding to the reference position of the vehicle. Based on the deviation, the computer executes a process for correcting the measurement value of the sensor.

  According to one aspect of the present invention, the sensor value can be calibrated.

FIG. 1 is a diagram illustrating an example of a schematic configuration of the entire survey system. FIG. 2 is a diagram schematically illustrating an example of a flow of investigation by the investigation system according to the first embodiment. FIG. 3 is a block diagram illustrating a functional configuration of the information processing apparatus. FIG. 4 is a diagram illustrating an example of a change in position at which road acceleration is measured. FIG. 5 is a block diagram illustrating a functional configuration of the correction apparatus. FIG. 6 is a diagram schematically showing the relationship between the speed of the vehicle and the change in the shaking detected as the deterioration of the pavement. FIG. 7 is a diagram illustrating an example of the deteriorated part screen. FIG. 8 is a flowchart showing the procedure of the deterioration detection process including the correction process. FIG. 9 is a diagram schematically illustrating an example of a survey flow by the survey system according to the second embodiment. FIG. 10 is a diagram illustrating a computer that executes a correction processing program.

  Hereinafter, embodiments of a correction processing program, a correction processing method, and a correction apparatus according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. Each embodiment can be appropriately combined within a range in which processing contents are not contradictory. Below, the case where this invention is applied to an investigation system is demonstrated.

[System configuration]
First, the investigation system according to the first embodiment will be described. FIG. 1 is a diagram illustrating an example of a schematic configuration of the entire survey system. The investigation system 1 detects the deterioration of the road surface from the acceleration acquired when traveling on the road by the information processing device 11 mounted on the vehicle 15.

  As illustrated in FIG. 1, the survey system 1 includes a correction device 10 and an information processing device 11. The correction device 10 and the information processing device 11 can exchange various types of information. For example, the correction device 10 and the information processing device 11 are communicably connected via the network 12 and can exchange various types of information. As an aspect of the network 12, regardless of wired or wireless, mobile communication such as a mobile phone, the Internet (Internet), a LAN (Local Area Network), a VPN (Virtual Private Network), or any other communication network such as VPN All exchanges are possible.

  The information processing device 11 is a device that is mounted on the vehicle 15 and capable of transmitting acceleration indicating the position of the vehicle 15 and the shaking generated in the vehicle 15. The information processing apparatus 11 may be a detachable portable terminal device such as a smartphone, a PDA (Personal Digital Assistant), or a mobile phone that is installed on the vehicle 15 by the user. One aspect of the information processing apparatus 11 is realized by installing an application program that periodically measures position and acceleration in a mobile terminal device such as a smartphone and operating the application program. Further, the information processing apparatus 11 may be an apparatus that is fixedly mounted on the vehicle 15 such as a vehicle-mounted device. For example, the information processing apparatus 11 may be a drive record or a digital operation recorder. This digital operation recorder is also called a digital tachograph. In the example of FIG. 1, the case of having one information processing apparatus 11 is illustrated, but the disclosed system is not limited to this, and the number of information processing apparatuses 11 can be any number. Each of the information processing apparatuses 11 is mounted on the vehicle 15. The information processing apparatus 11 is supplied with power from the battery of the vehicle 15. For example, when the information processing device 11 is a portable terminal device that can be attached to and detached from the vehicle 15, power is supplied from the battery of the vehicle 15 by being connected to a cigar socket or the like via a power cable.

  The vehicle 15 may be any vehicle that travels on the road, and any type of automobile such as light, normal, and large can be employed. Further, the vehicle 15 may be a general vehicle, a commercial vehicle such as a truck, a bus, or a taxi, or a special vehicle such as a patrol vehicle that patrols regularly for abnormal roads. .

  The information processing apparatus 11 is equipped with various sensors used for detecting road surface deterioration. For example, the information processing apparatus 11 includes an acceleration sensor 20 and a GPS (Global Positioning System) unit 21. The acceleration sensor 20 measures acceleration including gravitational acceleration. The GPS unit 21 measures a position including longitude and latitude coordinate values.

  The information processing apparatus 11 periodically measures the position of the acceleration and the GPS unit 21 using the acceleration sensor 20, and generates travel data including the measured acceleration and position. Note that the travel data may include information other than acceleration and position. For example, the traveling data may include information on measurement results obtained by other sensors. The information processing apparatus 11 uploads the travel data to the correction apparatus 10 at a predetermined timing. For example, the information processing apparatus 11 uploads travel data via the network 12. The information processing apparatus 11 may upload the travel data to the correction apparatus 10 via a storage medium such as a memory card.

  The correction device 10 is a device that corrects the data uploaded from the information processing device 11 and provides a service for investigating changes in the road surface of the road using the corrected data. The correction device 10 is, for example, a computer such as a personal computer or a server computer. The correction device 10 may be implemented as a single computer. The correction device 10 may be implemented as a cloud using a plurality of computers. For example, a device that corrects data uploaded from the information processing device 11 and a device that investigates changes in the road surface of the road using the corrected data may be different devices. In the present embodiment, a case where the correction apparatus 10 is a single computer will be described as an example. The correction device 10 obtains a shake detection value indicating the magnitude of the shake at each position on the road based on a plurality of travel data obtained by the vehicle 15 traveling on each road. Then, the correction device 10 detects road surface deterioration from the detected value of road shaking.

  Here, when pavement deterioration is detected by a plurality of vehicles, the detection value detected by the acceleration sensor 20 of each vehicle 15 varies depending on differences in the vehicle 15, tires, number of passengers, speed, and the like.

  Therefore, the investigation system 1 according to the first embodiment collects the detection values generated in the reference vehicle 15 at the reference position by running the reference position using the reference vehicle 15. Hereinafter, the reference vehicle 15 is referred to as a reference vehicle 15A. The reference vehicle 15A may be a dedicated vehicle, and any vehicle 15 may be used as a reference. In the first embodiment, a case where any one of the vehicles 15 is the reference vehicle 15A will be described as an example. The reference position is not caused by deterioration of the pavement, such as a joint portion of a railroad crossing or a bridge floor board (expansion / contraction device), but is a point where a vibration exceeding a predetermined value occurs. The reference position may be, for example, a step between a road and a pedestrian crossing in a facility provided along a road such as a convenience store. Then, the investigation system 1 according to the first embodiment corrects the acceleration value detected by the vehicle 15 using the acceleration value at the reference position collected by the reference vehicle 15A.

  FIG. 2 is a diagram schematically illustrating an example of a flow of investigation by the investigation system according to the first embodiment. In the example of FIG. 2, detection values at positions A to F that are reference positions are collected by the reference vehicle 15A. In the example of FIG. 2, the vehicle 15B travels on the road and collects detection values at positions A to C and G to I. At positions A to C, both the reference vehicle 15A and the vehicle 15B pass and overlap. The investigation system 1 obtains a correction coefficient by using the detected value of the shake at the positions A to C collected by the reference vehicle 15A and the detected value of the shake at the positions A to C collected by the vehicle 15B. All the detected values of shaking detected by 15B are corrected.

  Thus, when the reference position is included in the travel route indicated by the travel data of the vehicle 15B, the investigation system 1 is based on the difference between the reference shake detection value at the reference position and the detected shake detection value. Then, the detection value of the acceleration sensor 20 is corrected. Thereby, the investigation system 1 can calibrate the value of the acceleration sensor 20 even when the detection value of the shake detected by the acceleration sensor 20 changes due to differences in the vehicle 15, tires, number of passengers, speed, and the like.

[Configuration of information processing device]
Subsequently, a functional configuration of the information processing apparatus 11 included in the road surface survey system according to the present embodiment will be described. FIG. 3 is a block diagram illustrating a functional configuration of the information processing apparatus. As illustrated in FIG. 3, the information processing apparatus 11 includes an acceleration sensor 20, a GPS unit 21, a storage unit 22, a communication I / F (interface) unit 23, and an upload control unit 24. Note that the information processing apparatus 11 may be mounted with sensors other than the above sensors.

  The acceleration sensor 20 is a sensor that measures acceleration including gravitational acceleration. For example, the acceleration sensor 20 is a triaxial acceleration sensor that measures acceleration in three axial directions, ie, an X-axis direction, a Y-axis direction, and a Z-axis direction that are orthogonal to each other. As one aspect, the acceleration sensor 20 stores acceleration information in which the acceleration value in the triaxial direction is associated with the measurement time in the storage unit 22 every time the acceleration in the triaxial direction is measured. As an acceleration measuring method, any method such as a semiconductor method, a mechanical method, an optical method, or the like can be adopted. The measurement time may be an elapsed time starting from the time when the measurement is started, or may be a date and time measured by a time stamp or the like. When the measurement time is the elapsed time, the acceleration information in which the measurement start date and time at which the measurement is started is embedded in the header is stored in the storage unit 22. In the following, it is assumed that the acceleration sensor 20 measures acceleration at a cycle of 0.5 seconds, but the measurement cycle of the acceleration sensor 20 is not limited to this, and is applied when acceleration is measured at an arbitrary cycle. it can. The acceleration sensor 20 is a triaxial acceleration sensor that measures acceleration in the triaxial direction, but may be a G (gravitation) sensor that measures acceleration in the gravitational direction.

  The GPS unit 21 is a unit for measuring coordinate values such as latitude and longitude by receiving radio waves from a plurality of GPS satellites and determining the distance to each GPS satellite. As an aspect, every time the GPS unit 21 measures the coordinate values of latitude and longitude, the GPS unit 21 stores position information in which the coordinate values are associated with the measurement date and time in the storage unit 22. In the following description, it is assumed that the GPS unit 21 measures the latitude and longitude coordinate values in a cycle of 0.5 seconds in synchronization with the acceleration sensor 20, but the measurement cycle of the GPS unit 21 is limited to this. Instead, it can be applied when coordinate values are measured at an arbitrary period.

  The storage unit 22 is a storage device that stores various data. For example, the storage unit 22 stores travel data such as acceleration information and position information. As an aspect of the storage unit 22, a storage device such as a hard disk or an optical disk can be employed in addition to a semiconductor memory that can rewrite data such as a flash memory or an NVSRAM (Non Volatile Static Random Access Memory).

  The communication I / F unit 23 is an interface that performs communication control with another device, for example, the correction device 10. For example, the communication I / F unit 23 transmits travel data accumulated in the storage unit 22 to the correction device 10. As an aspect of the communication I / F unit 23, a network interface card (NIC) such as a LAN card or a modem can be employed.

  The upload control unit 24 is a processing unit that controls the communication I / F unit 23 to control data upload to the correction apparatus 10. As one aspect, the upload control unit 24 transmits travel data such as acceleration information and position information stored in the storage unit 22 to the correction device 10 at a predetermined timing. For example, the upload control unit 24 causes the correction device 10 to transmit data periodically, such as at regular intervals, or when the amount of travel data stored in the storage unit 22 reaches a predetermined data size. Note that the upload control unit 24 may transmit travel data to the correction device 10 at a timing when a predetermined operation for instructing upload is performed. The upload control unit 24 may delete the uploaded travel data from the storage unit 22 when the travel data is transmitted to the correction device 10.

  Note that various types of integrated circuits and electronic circuits can be employed for the upload control unit 24. For example, an ASIC (Application Specific Integrated Circuit) is an example of the integrated circuit. Examples of the electronic circuit include a central processing unit (CPU) and a micro processing unit (MPU).

  When a predetermined operation for instructing the start of acceleration measurement is performed, the information processing apparatus 11 periodically measures acceleration and position by the acceleration sensor 20 and the GPS unit 21, and the measured acceleration information and position information are used as travel data. Is stored in the storage unit 22. For example, the information processing apparatus 11 measures acceleration and position at a cycle of 0.5 seconds and stores the acceleration information and position information in the storage unit 22 as travel data. The information processing apparatus 11 may be connected to a vehicle control unit or the like, and start measuring acceleration and position as the engine starts. Thereby, when the vehicle 15 carrying the information processing apparatus 11 travels on the road, the travel data records acceleration information at each position on the traveled road and position information obtained by measuring the acceleration. For example, in the case of the vehicle 15 that travels at a speed of 60 km / h, the travel data includes position information of each position and acceleration at each position at intervals of about 8 m. FIG. 4 is a diagram illustrating an example of a change in position at which road acceleration is measured. For example, when the vehicle 15 travels on the road R1, position information of each position of the positions p1 to p4 and acceleration information at each position are recorded in the travel data at times t1 to t4 with a period of 0.5 seconds. .

[Configuration of correction device]
Next, a functional configuration of the correction apparatus 10 according to the present embodiment will be described. FIG. 5 is a block diagram illustrating a functional configuration of the correction apparatus. As illustrated in FIG. 5, the correction device 10 includes a communication I / F unit 40, a display unit 41, an input unit 42, a storage unit 43, and a control unit 44.

  The communication I / F unit 40 is an interface that performs communication control with another apparatus, for example, the information processing apparatus 11. For example, the communication I / F unit 40 receives travel data from the information processing apparatus 11. As an aspect of the communication I / F unit 40, a network interface card such as a LAN card can be employed.

  The display unit 41 is a display device that displays various types of information. Examples of the display unit 41 include display devices such as an LCD (Liquid Crystal Display) and a CRT (Cathode Ray Tube). The display unit 41 displays various information. For example, the display unit 41 displays various screens including a later-described investigation target designation screen and a deterioration location screen.

  The input unit 42 is an input device that inputs various types of information. For example, the input unit 42 may be an input device such as a mouse or a keyboard. The input unit 42 receives an operation input from an administrator or the like who manages the system, and inputs operation information indicating the received operation content to the control unit 44.

  The storage unit 43 is a storage device such as a semiconductor memory element such as a flash memory, a hard disk, or an optical disk. The storage unit 43 is not limited to the above type of storage device, and may be a RAM (Random Access Memory) or a ROM (Read Only Memory).

  The storage unit 43 stores an OS (Operating System) executed by the control unit 44 and various programs used for road surface investigation. Further, the storage unit 43 stores various data necessary for executing the program executed by the control unit 44. As an example of such data, the storage unit 43 stores measurement data 45, reference position data 46, and normalization data 47.

  The measurement data 45 is data that stores a shake detection value at each position measured by each information processing apparatus 11. As an example, the measurement data 45 stores a shake detection value at each position when the vehicle 15 travels. The measurement data 45 is registered by a registration unit 52 described later.

  The reference position data 46 is data in which a reference fluctuation detection value at a reference position as a reference for correction is stored. As an example, the reference position data 46 stores a shake detection value when the reference vehicle 15A travels the reference position as a reference shake detection value. The reference position data 46 is registered by a registration unit 52 described later. When there are a plurality of shake detection values when the reference vehicle 15A travels the reference position, the average value may be used as the reference shake detection value. The average value may be obtained by removing the maximum value and the minimum value of the detection values. The latest shake detection value may be used as the reference shake detection value.

  The normalization data 47 is data for normalizing the shake detection value. Here, even if it passes through the degraded portion of the same pavement, the generated vibration changes depending on the speed of the vehicle 15. In general, even if the level difference is the same, the acceleration detected by the level difference increases as the speed increases to a predetermined speed, but decreases when the speed exceeds a predetermined speed.

  FIG. 6 is a diagram schematically showing the relationship between the speed of the vehicle and the change in the shaking detected as the deterioration of the pavement. In the example of FIG. 6, the magnitude of the shaking detected for pavement deterioration increases as the speed increases to the speed V, but decreases when the speed V is exceeded.

  The normalization data 47 stores a correction coefficient for correcting the shake detection value to the shake detection value at a predetermined reference speed for each speed.

  Returning to FIG. 5, the control unit 44 has an internal memory for storing programs and control data that define various processing procedures, and executes various processes using these. As shown in FIG. 5, the control unit 44 includes a derivation unit 50, a normalization unit 51, a registration unit 52, a reception unit 53, a correction unit 54, a detection unit 55, and an output unit 56.

  The deriving unit 50 is a processing unit that derives a shake detection value from the gravitational acceleration. Here, the acceleration sensor 20 measures acceleration including gravitational acceleration. For this reason, the acceleration information includes a component of gravitational acceleration. Therefore, the derivation unit 50 obtains the gravity direction at each position from the travel data uploaded from the information processing apparatus 11. For example, the deriving unit 50 extracts acceleration information during a period in which no change in position occurs in the travel data. When the position does not change, it is considered that the vehicle 15 is stopped. Therefore, the values of the accelerations in the x-axis direction, the y-axis direction, and the z-axis direction of the extracted acceleration information are due to gravity. Conceivable. Therefore, for example, the deriving unit 50 obtains the direction of gravity for the travel data from the values of acceleration in the x-axis direction, the y-axis direction, and the z-axis direction during a period in which no change has occurred in the position. Then, the deriving unit 50 uses the change in acceleration in the gravity direction from the previous position as a shake, and derives the difference in acceleration in the gravity direction from the previous position as a shake detection value. In addition, when the acceleration information included in the travel data is information on acceleration in the gravity direction, the process for obtaining the gravity direction is omitted. Further, when the change in gravity acceleration at each position is stored in the travel data, the processing by the deriving unit 50 may be omitted by using the value of the change in gravity acceleration as the shake detection value.

  The normalization unit 51 is a processing unit that normalizes the gravitational acceleration at each position derived from the travel data. For example, the normalization unit 51 obtains a correction coefficient corresponding to the speed at each point of the measurement data 45 from the measurement data 45. Then, the normalization unit 51 normalizes the shake detection value at each point to the shake detection value at the reference speed using a correction coefficient corresponding to the speed at the point. For example, the normalization unit 51 obtains the shake detection value at the reference speed by multiplying the shake detection value at each point by a correction coefficient corresponding to the speed at the point.

  The registration unit 52 is a processing unit that registers the measurement data 45 in the storage unit 43. For example, the registration unit 52 registers the shake detection value normalized by the normalization unit 51 in the storage unit 43 as the measurement data 45. In addition, when the travel data is uploaded from the reference vehicle 15A and the reference position is included in the travel data, the registration unit 52 uses the reference position shake detection value as the reference shake detection value of the reference position. 46 is registered.

  The reception unit 53 is a processing unit that performs various types of reception. For example, the reception unit 53 receives the specification of the measurement data 45 to be investigated. The accepting unit 53 displays, for example, an investigation target designation screen for designating the measurement data 45 used for detecting deterioration of road surface change on the display unit 41, and accepts designation of the measurement data 45 to be investigated. In this embodiment, it is assumed that the designation of the measurement data 45 to be surveyed is received. However, when the travel data is received, the measurement data 45 registered from the received travel data is used as the measurement data 45 to be surveyed to change the road surface. You may process automatically as what detects deterioration.

  The correction unit 54 is a processing unit that corrects the measurement data 45 to be investigated. The correction unit 54 searches whether the reference position stored in the reference position data 46 is included in the travel route indicated by the measurement data 45 to be investigated. For example, the correction unit 54 searches whether or not the reference position is included in a predetermined range that is regarded as the same position for each position where the fluctuation of the measurement data 45 to be investigated is detected. When the reference position is included in the travel route indicated by the measurement data 45 to be investigated, the correction unit 54 calculates the fluctuation detection value of the measurement data 45 to be investigated and the reference fluctuation detection value of the reference position data 46 for each reference position. read out. The correction unit 54 obtains a deviation between the reference fluctuation detection value of the reference position data 46 and the fluctuation detection value of the measurement data 45 to be investigated for each reference position. Then, the correction unit 54 corrects the measurement value of the measurement data 45 based on the difference between the reference shake detection value at each reference position and the actual shake detection value. This correction may be performed by any method as long as the deviation between the reference shake detection value and the actual shake detection value can be corrected to be small. For example, the correction unit 54 obtains a correction coefficient by dividing the actual shake detection value by the reference shake detection value for each reference position. Then, the correction unit 54 obtains the average value of the correction coefficient for each reference position, and multiplies the fluctuation detection value at each position of the measurement data 45 to be investigated by the average value of the correction coefficient to calculate the average value of each position of the measurement data 45. Correct the shake detection value. For example, the correction unit 54 may obtain the average value by excluding the maximum value and the minimum value of the correction coefficient. For example, the correction unit 54 may correct the shake detection value at each position of the measurement data 45 using a correction coefficient that is the center when the correction coefficients are arranged in descending order.

  The detection unit 55 detects a deteriorated portion of the road surface from the measurement data 45 corrected by the correction unit 54. For example, the detection unit 55 compares the shake detection value at each position of the measurement data 45 corrected by the correction unit 54 with a predetermined threshold value. Then, the detection unit 55 determines that a position where the shake detection value is equal to or greater than a predetermined threshold is a degraded portion. Note that the detection unit 55 may detect the degree of deterioration by storing a plurality of thresholds corresponding to the degree of progress of deterioration. The threshold value may be adjustable from the outside. Moreover, you may perform the degradation determination which does not compare with a threshold value.

  The output unit 56 is a processing unit that outputs information related to the deteriorated part based on the detection result by the detection unit 55. For example, the output unit 56 causes the display unit 41 to display a degradation point screen in which the position where the degradation point is determined by the detection unit 55 is mapped on a map. Note that the output unit 56 may cause the storage unit 43 to store determination result information.

  FIG. 7 is a diagram illustrating an example of the deteriorated part screen. In the degradation location screen 80, the position where the degradation location on the map is determined is indicated by a mark 81. By displaying such a degraded part screen 80, a road researcher can visually and geographically grasp the point where the degradation has occurred.

[Process flow]
Next, a processing flow of the correction apparatus 10 according to the present embodiment will be described. FIG. 8 is a flowchart showing the procedure of the deterioration detection process including the correction process. This deterioration detection process is executed, for example, at the timing when the measurement data 45 to be detected is designated on the designation screen.

  As illustrated in FIG. 8, the correction unit 54 searches whether the reference position stored in the reference position data 46 is included in the travel route indicated by the measurement data 45 to be investigated (S10). When the reference position is included in the travel route indicated by the measurement data 45 to be investigated, the correction unit 54 detects the reference shake detection value at the reference position stored in association with the reference position and the reference position of the measurement data 45. The deviation from the shake detection value at the position corresponding to is calculated (S11). The correction unit 54 corrects the measurement value of the measurement data 45 based on the difference between the reference shake detection value at the reference position and the actual shake detection value (S12).

  The detection unit 55 detects a deteriorated portion of the road surface from the measurement data 45 corrected by the correction unit 54 (S13).

  Based on the detection result of the detection unit 55, the output unit 56 causes the display unit 41 to display a degradation location screen showing information on the degradation location (S14), and ends the process.

[effect]
As described above, the correction device 10 according to the present embodiment is configured such that the reference position stored in the storage unit 43 in the travel route indicated by the travel data of the vehicle 15 obtained by traveling the vehicle 15 on which the acceleration sensor 20 is mounted. The following processing is performed when the is included. That is, the correction device 10 determines the acceleration sensor 20 based on the difference between the reference shake detection value at the reference position stored in the storage unit 43 and the shake detection value at the reference position detected by the vehicle 15. Correct the measured value. Thereby, the correction device 10 can calibrate the value of the acceleration sensor 20 even when the detected value of the shake detected by the acceleration sensor 20 changes due to differences in the vehicle 15, tires, number of passengers, speed, and the like. Thereby, the correction device 10 can accurately detect the deterioration of the road surface at the same level even if the conditions of the vehicle are different.

  Further, in the correction device 10 according to the present embodiment, the reference position is not caused by deterioration, but is a point where a shake exceeding a predetermined value occurs. As described above, the correction device 10 can accurately calibrate the detection value of the vibration detected by the acceleration sensor 20 by setting the point where the vibration exceeding the predetermined value occurs.

  Next, Example 2 will be described. The overall schematic configuration of the survey system 1 according to the second embodiment and the functional configuration of the information processing apparatus 11 are the same as those shown in FIGS.

  Here, the investigation system 1 according to the second embodiment does not collect the shake at the reference position by the reference vehicle 15A, but uses the measurement data 45 collected from the other vehicles 15 from the travel data collected from the vehicle 15. A case where correction is performed will be described. In the survey system 1 according to the second embodiment, for example, the degradation position of the road surface is detected from the measurement data 45 collected by the vehicle 15 such as a truck, a bus, or a taxi. For example, a position where the acceleration in the gravitational direction changes by a predetermined threshold or more is detected as a road surface deterioration position. The road surface deterioration position increases as the vehicle 15 travels. Then, the investigation system 1 according to the second embodiment corrects the acceleration value detected by the other vehicle 15 using the acceleration value at the deteriorated position collected by the vehicle 15.

  FIG. 9 is a diagram schematically illustrating an example of a survey flow by the survey system according to the second embodiment. The example of FIG. 9 stores positions A to F as road surface deterioration positions from measurement data 45 collected by a vehicle 15C such as a truck. In the example of FIG. 9, another vehicle 15D travels on the road and collects acceleration values at positions A to C and G to I. At positions A to C, both the vehicle 15C and the vehicle 15D pass and overlap. The investigation system 1 uses the deviation between the detected value of the shake at the positions A to C collected by the reference vehicle 15C and the detected value of the shake at the positions A to C detected by the vehicle 15D to measure the measurement data 45. Correct the detected value of shaking.

  Since the configuration of the correction apparatus 10 according to the second embodiment is substantially the same as that of FIG. 5 shown in the first embodiment, different parts will be mainly described.

  The registration unit 52 registers the shake detection value normalized by the normalization unit 51 in the storage unit 43 as the measurement data 45. Further, the registration unit 52 identifies the vehicle 15 that is the transmission source of the measurement data that is the source of the measurement data 45, with the position where the acceleration in the gravitational direction has changed by a predetermined threshold or more as a road deterioration position. Information is registered in the reference position data 46. This identification information does not need to be information for identifying the vehicle 15, and may be any information that can identify the degradation position detected by the same vehicle 15. For example, the registration unit 52 uniquely determines an identification number for the vehicle 15 and stores the identification number.

  The correcting unit 54 searches whether the detected degraded position stored in the reference position data 46 is included in the travel route indicated by the measurement data 45 to be investigated. When the detected degradation position is included in the travel route indicated by the measurement data 45 to be investigated, the correction unit 54 corresponds to the shake detection value at the degradation position of the reference position data 46 and the degradation position of the measurement data 45. The deviation between the vibration detection value at the position is obtained. Then, the correction unit 54 corrects the measurement value of the measurement data 45 based on the deviation between the shake detection value at the deteriorated position of the reference position data 46 and the actual shake detection value. This correction may be performed by any method as long as the deviation between the detection value at the deteriorated position of the reference position data 46 and the actual shake detection value can be corrected small. For example, the correction unit 54 obtains the vehicle 15 having the largest number of coincidence between the measurement data 45 to be investigated and the deteriorated position from the detected deteriorated position of each vehicle 15 stored in the reference position data 46. Then, the correction unit 54 divides the actual shake detection value by the detection value at the deteriorated position of the reference position data 46 for each deteriorated position where the vehicle 15 having the largest number of coincidence of the deteriorated positions coincides. Ask for. Then, the correction unit 54 obtains an average value of the correction coefficient for each degradation position, and multiplies the shake detection value at each position of the measurement data 45 to be investigated by the average value of the correction coefficient to calculate the average value of each position of the measurement data 45. Correct the shake detection value. Thereby, the shake detection value at each position of the measurement data 45 is corrected to a value based on the vehicle 15 having the largest number of matches. For example, the correction unit 54 may obtain the average value by excluding the maximum value and the minimum value of the correction coefficient. For example, the correction unit 54 may correct the shake detection value at each position of the measurement data 45 using a correction coefficient that is the center when the correction coefficients are arranged in descending order. Further, for example, the correction unit 54 is not limited to the vehicle 15 having the largest number of coincidence of the deteriorated positions. When the deteriorated positions match, the correction unit 54 calculates the actual shake detection value at the matched deteriorated position in the reference position data 46. The correction coefficient may be obtained by dividing by the detection value at the deterioration position, and the average value of all the correction coefficients may be obtained.

  The detection unit 55 detects a deteriorated portion of the road surface from the measurement data 45 corrected by the correction unit 54. For example, the detection unit 55 compares the shake detection value at each position of the measurement data 45 corrected by the correction unit 54 with a predetermined threshold value. Then, the detection unit 55 determines that a position where the shake detection value is equal to or greater than a predetermined threshold is a degraded portion. Note that the detection unit 55 may perform deterioration determination without performing comparison with a threshold value.

[effect]
As described above, the correction device 10 according to the present embodiment is a vehicle whose reference position is different from the vehicle 15D and is included in a travel route on which another vehicle 15C equipped with the acceleration sensor 20 travels. The position of The correction device 10 assumes that the reference shake detection value corresponds to the shake detection value detected at the reference position by the acceleration sensor 20 mounted on the other vehicle 15D. Thereby, the correction apparatus 10 can correct the shake detection value measured by the vehicle 15C using the shake detection value of the position where the other vehicle 15D has traveled as the reference shake detection value. In this way, by setting any position included in the travel route traveled by the other vehicle 15D as the reference position, the reference position increases as the other vehicle 15D travels. As described above, when the reference position increases, the vehicle 15C has an increased chance of passing through any reference position during traveling, and the shake detection value is corrected. Therefore, the deterioration of the road surface can be accurately detected.

  Although the embodiments related to the disclosed apparatus have been described so far, the disclosed technology may be implemented in various different forms other than the above-described embodiments. Therefore, another embodiment included in the present invention will be described below.

  For example, in the above embodiment, the case where the gravitational acceleration at each position derived from the travel data is normalized by the correction coefficient corresponding to the speed has been described, but the present invention is not limited to this. For example, when the change in gravitational acceleration according to the speed is small, normalization using a correction coefficient may be omitted.

  In the above-described embodiment, the case where the road surface change is calculated from the change in the absolute value of the acceleration detected by the triaxial acceleration sensor 20 or the change in the acceleration in the gravity direction has been described. However, the disclosed apparatus is limited to this. Not. For example, the road surface change may be calculated using a change in acceleration in a direction orthogonal to the direction of gravity. For example, when the vehicle 15 performs sudden acceleration, sudden braking, or sudden turn, vibrations such as rolling and pitching occur in the vehicle 15, and the change in acceleration in the gravity direction also increases. Therefore, when acceleration of a predetermined value or more is measured in a direction orthogonal to the gravitational direction, the acceleration in the gravitational direction may be corrected by adding or subtracting the acceleration in the gravitational direction at a certain rate or a predetermined value. For example, when the vehicle 15 suddenly accelerates or brakes suddenly, pitching shake occurs in the vehicle 15. Thereby, when the vehicle 15 is swinging upward in the gravity direction, the acceleration sensor 20 detects the acceleration in the gravity direction smaller than the actual acceleration by subtracting the acceleration in the gravity direction due to the upward acceleration in the gravity direction due to the swing. The Further, when the acceleration sensor 20 is swinging downward in the gravity direction, the acceleration in the gravity direction is added to the gravity direction due to the swing due to the downward acceleration, and the acceleration in the gravity direction is detected to be larger than the actual acceleration. Therefore, for example, when an acceleration greater than a predetermined value is measured rearward in the traveling direction of the vehicle 15, it is assumed that the vehicle 15 is rapidly accelerating, and the acceleration in the gravitational direction is corrected by adding a certain ratio or a predetermined value. Also good. Further, when an acceleration greater than or equal to a predetermined value is measured forward in the traveling direction of the vehicle 15, a correction that subtracts a certain percentage or a predetermined value of the acceleration in the gravity direction may be performed assuming that the vehicle 15 is suddenly braking. . The traveling direction of the vehicle 15 is obtained from a change in position and a change in acceleration. For example, in a state where there is no change in position where the vehicle 15 is estimated to be stopped, the acceleration is detected in a direction other than the gravitational direction when the position where the vehicle 15 is estimated to start moving is changed. You can ask for directions.

  In the above-described embodiment, the correction apparatus 10 displays the investigation target designation screen and the degradation point screen 80 on the display unit 41 and receives an operation from the input unit 42. However, the present invention is not limited to this. For example, the investigation target designation screen and the degradation point screen 80 may be displayed on a terminal device connected to the correction device 10 via the network 12 and an operation may be received from the terminal device.

  Further, each component of each illustrated apparatus is functionally conceptual, and does not necessarily need to be physically configured as illustrated. In other words, the specific state of distribution / integration of each device is not limited to the one shown in the figure, and all or a part thereof may be functionally or physically distributed or arbitrarily distributed in arbitrary units according to various loads or usage conditions. Can be integrated and configured. For example, the processing units of the derivation unit 50, the normalization unit 51, the registration unit 52, the reception unit 53, the correction unit 54, the detection unit 55, and the output unit 56 of the correction apparatus 10 may be appropriately integrated. Further, the processing of each processing unit may be appropriately separated into a plurality of processing units. Further, all or any part of each processing function performed in each processing unit can be realized by a CPU and a program analyzed and executed by the CPU, or can be realized as hardware by wired logic. .

[Correction processing program]
The various processes described in the above embodiments can also be realized by executing a program prepared in advance on a computer system such as a personal computer or a workstation. Therefore, in the following, an example of a computer system that executes a program having the same function as in the above embodiment will be described. FIG. 10 is a diagram illustrating a computer that executes a correction processing program.

  As illustrated in FIG. 10, the computer 300 includes a central processing unit (CPU) 310, a hard disk drive (HDD) 320, and a random access memory (RAM) 340. These units 300 to 340 are connected via a bus 400.

  In the HDD 320, a correction processing program 320a that exhibits the same functions as those of the derivation unit 50, normalization unit 51, registration unit 52, reception unit 53, correction unit 54, detection unit 55, and output unit 56 of the correction device 10 is stored in advance. Remembered. Note that the correction processing program 320a may be separated as appropriate.

  The HDD 320 stores various information. For example, the HDD 320 stores measurement data 320b corresponding to the measurement data 45 shown in FIG. 5, reference position data 320c corresponding to the reference position data 46, and normalization data 320d corresponding to the normalization data 47.

  Then, the CPU 310 reads the correction processing program 320 a from the HDD 320, expands it in the RAM 340, and executes each process using the measurement data 320 b stored in the HDD 320. That is, the correction processing program 320 a performs the same operations as the derivation unit 50, normalization unit 51, registration unit 52, reception unit 53, correction unit 54, detection unit 55, and output unit 56.

  The correction processing program 320a is not necessarily stored in the HDD 320 from the beginning.

  For example, the program is stored in a “portable physical medium” such as a flexible disk (FD), a CD-ROM, a DVD disk, a magneto-optical disk, or an IC card inserted into the computer 300. Then, the computer 300 may read and execute the program from these.

  Furthermore, the program is stored in “another computer (or server)” connected to the computer 300 via a public line, the Internet, a LAN, a WAN, or the like. Then, the computer 300 may read and execute the program from these.

DESCRIPTION OF SYMBOLS 1 Investigation system 10 Correction apparatus 11 Information processing apparatus 15,15B, 15C, 15D Vehicle 15A Reference vehicle 20 Acceleration sensor 43 Storage part 44 Control part 45 Measurement data 46 Reference position data 47 Normalization data 50 Derivation part 51 Normalization part 52 Registration unit 53 Reception unit 54 Correction unit 55 Detection unit 56 Output unit

Claims (5)

  When the reference position stored in the storage unit is included in the travel route indicated by the travel data of the vehicle obtained by the travel of the vehicle on which the sensor for detecting shaking is mounted, the storage unit associates the reference position with the reference position. Correction of the measurement value of the sensor based on the deviation between the reference shake detection value at the reference position stored in the memory and the shake detection value detected by the sensor at a position corresponding to the reference position of the vehicle. A correction processing program for causing a computer to execute processing to be performed. The reference position is a vehicle different from the vehicle, and is any position included in a travel route traveled by another vehicle equipped with a sensor for detecting a shake, and the reference shake detection value is the other The correction processing program according to claim 1, wherein a sensor mounted on the vehicle corresponds to a shake detection value detected at the reference position. The correction processing program according to claim 1, wherein the shake detection value is a value indicating a shake exceeding a predetermined value.   When the reference position stored in the storage unit is included in the travel route indicated by the travel data of the vehicle obtained by the travel of the vehicle on which the sensor for detecting shaking is mounted, the storage unit associates the reference position with the reference position. Correction of the measurement value of the sensor based on the deviation between the reference shake detection value at the reference position stored in the memory and the shake detection value detected by the sensor at a position corresponding to the reference position of the vehicle. A correction processing method, wherein a computer executes a process to be performed. A storage unit in which a reference position and a reference shake detection value at the reference position are stored in association with each other;
When the reference position stored in the storage unit is included in the travel route indicated by the travel data of the vehicle obtained by the travel of the vehicle on which the sensor for detecting shaking is mounted, the storage unit corresponds to the reference position Correction of the measured value of the sensor on the basis of a deviation between the reference shake detected value at the reference position and the shake detected value detected by the sensor at a position corresponding to the reference position of the vehicle A correction unit for performing
A correction apparatus comprising:

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