Road surface maintenance system

Abstract

According to the present invention, a travel frequency identification unit identifies the travel frequency, for each section of the road surface, of a work machine traveling on the road surface of a work site. A maintenance road surface determination unit determines a section to be maintained on the road surface of the work site based on the travel frequency.

Description

Road Surface Maintenance System

[0001] This application claims priority to Japanese Patent Application No. 2024-030308, filed February 29, 2024, the contents of which are incorporated herein by reference.

[0002] At work sites, road surfaces are formed on which work machines such as dump trucks travel. As the work machines travel, the road surfaces become rough, so road surface maintenance must be performed using maintenance machines such as motor graders and bulldozers. Patent Document 1 discloses a technology for generating a plan for road surface work using bulldozers.

[0003] Japanese Patent Application Publication No. 2024-005910

[0004] Generally, road maintenance work is carried out based on the report of the operator of the work machine. As a result, the section to be maintained is unknown until the report is received from the operator, which may result in inefficient road maintenance work. An object of the present disclosure is to provide a road maintenance system that can carry out road maintenance work efficiently.

[0005] According to one aspect of the present disclosure, a road surface maintenance system includes a travel frequency identification unit that identifies the travel frequency for each section of a road surface of a work machine traveling on the road surface of a work site, and a maintenance road surface determination unit that determines the section of the road surface of the work site to be maintained based on the travel frequency.

[0006] According to the above aspect, the road surface maintenance system can efficiently carry out road surface maintenance work.

[0007] FIG. 1 is a schematic diagram showing the configuration of a road surface maintenance system according to a first embodiment. FIG. 2 is a schematic block diagram showing the configuration of a management device according to a first embodiment. FIG. 3 is a diagram showing an example of a maintenance instruction screen according to a first embodiment. FIG. 4 is a diagram showing an example of a travel frequency screen according to a first embodiment. FIG. 5 is a diagram showing an example of a road surface roughness screen according to a first embodiment. FIG. 6 is a flowchart showing a method for generating a road surface maintenance plan by a management device according to a first embodiment. FIG. 7 is a schematic block diagram showing the configuration of a management device according to a second embodiment. FIG. 8 is a flowchart showing a method for generating a road surface maintenance plan by a management device according to a second embodiment. FIG. 9 is a diagram showing an example of a maintenance record screen according to a second embodiment.

[0008] First Embodiment Configuration of Road Surface Maintenance System Hereinafter, embodiments will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing the configuration of a road surface maintenance system 1 according to a first embodiment. The road surface maintenance system 1 includes a management device 10, a haulage vehicle 20, and a maintenance machine 30. Work machines such as the haulage vehicle 20 and the maintenance machine 30 operate at a work site. The work site may be, for example, a mine. At the work site, a road surface is formed along which the haulage vehicle 20, which transports loads, travels.

[0009] The management device 10 acquires vehicle body data from the transport vehicle 20 and the maintenance machine 30 and determines which sections of the road surface at the work site are to be maintained. The vehicle body data is data collected from sensors installed on the work machines and data that indicates the condition of the work machines calculated from that data. The management device 10 presents information about the determined sections to be maintained to a manager, such as a site supervisor, at the work site.

[0010] The transport vehicle 20 may be, for example, a dump truck. The transport vehicle 20 transports loads generated at a work site. Examples of loads transported by the transport vehicle 20 include crushed stone, earth and sand, rocks, coal, and the like.

[0011] The transport vehicle 20 according to the first embodiment is a dump truck. The transport vehicle 20 includes a vehicle body 21, a vessel 22, wheels 23, a suspension cylinder 24, a suspension pressure sensor 25, a positioning device 26, and a computer 27.

[0012] The vessel 22 is a loading platform on which a load is carried. The vessel 22 is disposed on the upper part of the vehicle body 21. The vessel 22 is driven by power transmitted from the vehicle body 21.

[0013] The suspension cylinders 24 are provided between the wheels 23 and the vehicle body 21. The suspension cylinders 24 absorb the impact that the wheels 23 receive from the road surface and suppress vibration of the vehicle body 21. Hydraulic oil is sealed inside the suspension cylinders 24, and the suspension cylinders 24 absorb the impact by expanding and contracting. Note that transporter vehicles 20 according to other embodiments may be provided with a suspension device having an air spring or a shock absorber instead of the suspension cylinders 24.

[0014] The suspension pressure sensors 25 detect the load acting on the suspension cylinders 24. The suspension pressure sensors 25 are provided in the suspension cylinders 24 for the left and right front wheels and the left and right rear wheels of the transporter vehicle 20.

[0015] The positioning device 26 uses the Global Navigation Satellite System (GNSS) to measure the position of the delivery vehicle 20. The position measured by the positioning device 26 is expressed in a global coordinate system.

[0016] The computer 27 collects measurement data from the suspension pressure sensor 25 and the positioning device 26 and transmits it to the management device 10 as vehicle body data. From the measurement data from the suspension pressure sensor 25, it is possible to calculate the weight of the load on the transport vehicle 20 and the roughness of the road surface on which the transport vehicle 20 is traveling. The computer 27 collects the vehicle body data at a predetermined interval (for example, every second) and transmits it to the management device 10. The data may be transmitted to the management device 10 each time it is collected, or may be transmitted by batch processing.

[0017] <Configuration of Maintenance Machine 30> The maintenance machine 30 according to the first embodiment is a motor grader. The maintenance machine 30 includes a vehicle body 31, a blade 32, a lift cylinder 33, a lift stroke sensor 34, wheels 35, a positioning device 36, and a computer 37. The maintenance machine 30 performs road surface maintenance by traveling with the blade 32 in contact with the road surface.

[0018] The blade 32 is supported by the vehicle body 31. The lift cylinder 33 is driven to perform a lifting operation on the blade 32. The lifting operation refers to the operation of moving the blade 32 up and down relative to the vehicle body 31. One end of the lift cylinder 33 is attached to the blade 32, and the other end of the lift cylinder 33 is attached to the vehicle body 31. The lift cylinder 33 is driven by the operation of an operator of the maintenance machine. The lift stroke sensor 34 measures the stroke length of the lift cylinder 33.

[0019] The positioning device 36 uses GNSS to measure the position of the maintenance machine 30. The position measured by the positioning device 36 is expressed in a global coordinate system.

[0020] The computer 37 collects measurement data from the lift stroke sensor 34 and the positioning device 36 and transmits it to the management device 10 as vehicle body data. It is possible to calculate whether maintenance work is being performed using the blade 32 from the measurement data from the lift stroke sensor 34. Note that a maintenance machine 30 according to another embodiment may be provided with a pressure sensor that detects the hydraulic pressure of the blade 32 instead of the lift stroke sensor 34. In this case, the computer 37 may calculate whether the blade 32 is operating or whether maintenance work is being performed on the blade 32 from the measurement data from the pressure sensor. Furthermore, the computer 37 according to another embodiment may calculate whether maintenance work is being performed based on the detected value of the lever operation for operating the blade 32. The computer 37 collects vehicle body data at a predetermined interval (e.g., every second) and transmits it to the management device 10. Transmission to the management device 10 may be performed each time the data is collected or by batch processing.

[0021] <Configuration of Management Device 10> FIG. 2 is a schematic block diagram showing the configuration of the management device 10 according to the first embodiment. The management device 10 includes a processor, memory, auxiliary storage device, and the like, all connected via a bus. Examples of the processor include a central processing unit (CPU), a graphic processing unit (GPU), and a microprocessor. The management device 10 executes a program to perform calculations to determine sections of the road surface at the work site to be maintained. The program may be recorded on a computer-readable recording medium. Examples of computer-readable recording media include storage devices such as magnetic disks, magneto-optical disks, optical disks, and semiconductor memories. The program may be received from an external device via a telecommunications line. Note that all or part of the functions of the management device 10 may be implemented using a custom large-scale integrated circuit (LSI), such as an application-specific integrated circuit (ASIC) or a programmable logic device (PLD). Examples of PLDs include programmable array logic (PAL), generic array logic (GAL), complex programmable logic devices (CPLD), and field programmable gate arrays (FPGA). Such integrated circuits are also included in the category of processors.

[0022] The management device 10 includes a vehicle body data acquisition unit 11, a vehicle body data storage unit 12, a driving frequency identification unit 13, a roughness identification unit 14, a maintenance road surface determination unit 15, and a display control unit 16. That is, the processor of the management device 10 includes the vehicle body data acquisition unit 11, the vehicle body data storage unit 12, the driving frequency identification unit 13, the roughness identification unit 14, the maintenance road surface determination unit 15, and the display control unit 16 by executing a program.

[0023] The vehicle body data acquisition unit 11 acquires vehicle body data from the transport vehicle 20 and the maintenance machine 30 and records the data in association with the acquisition time in the vehicle body data storage unit 12. The vehicle body data of the transport vehicle 20 includes at least measurement data of the suspension pressure and the position of the transport vehicle 20. The vehicle body data of the maintenance machine 30 according to the first embodiment includes at least measurement data of the lift stroke sensor 34 indicating the lift amount of the blade, and measurement data of the position of the maintenance machine 30 obtained by the positioning device 36.

[0024] The travel frequency identification unit 13 identifies the travel frequency of the haulage vehicle 20 for each road section based on the vehicle body data of the haulage vehicle 20 recorded in the vehicle body data storage unit 12. The management device 10 manages the road surface of the work site by dividing it into multiple sections separated by a mesh. In the first embodiment, the road section is separated by a square mesh. On the other hand, in other embodiments, the sections may be separated by a mesh of other polygons that can fill a plane, such as a triangular mesh or a hexagonal mesh, or may be separated by circles or polygons that allow overlapping between sections. The travel frequency identification unit 13 identifies the travel trajectory of the haulage vehicle 20 from the time series of the vehicle body data of the haulage vehicle 20 and identifies the travel frequency by calculating the number of times the haulage vehicle 20 passed through each section within a certain period. Sections with a high travel frequency affect the travel of many haulage vehicles 20 and therefore have a high maintenance priority.

[0025] The roughness identification unit 14 identifies the roughness of each road section based on the vehicle body data of the haulage vehicle 20 recorded in the vehicle body data storage unit 12. The roughness identification unit 14 identifies the travel trajectory of the haulage vehicle 20 from the time series of the vehicle body data of the haulage vehicle 20, and identifies the road surface roughness based on changes in suspension pressure when the vehicle travels through each section. For example, the roughness identification unit 14 identifies the road surface roughness in the following procedure. First, the roughness identification unit 14 extracts a waveform of the suspension pressure from when the haulage vehicle enters the section to be calculated to when it exits. The roughness identification unit 14 identifies the maximum amplitude and peak frequency from the extracted waveform of the suspension pressure. The peak frequency is the frequency with the greatest power when the waveform of the suspension pressure is Fourier transformed. Next, the roughness identification unit 14 calculates the weight of the load on the haulage vehicle 20 from the suspension pressure when it is stopped. The roughness identification unit 14 calculates the road surface roughness of the section based on a pre-stored function that calculates road surface roughness from the maximum amplitude and weight. When the same section has been passed multiple times, the roughness identification unit 14 may calculate the road surface roughness from the vehicle body data of the transport vehicle 20 that passed last, or may calculate the road surface roughness as an average value calculated from the vehicle body data of the multiple sections. The road surface roughness may also be corrected based on the speed, acceleration, and whether or not the brakes are applied of the transport vehicle 20. A section with high road surface roughness is difficult for the transport vehicle 20 to travel through, and therefore can be said to have a high maintenance priority.

[0026] The maintenance road surface determination unit 15 calculates the maintenance priority of each road section based on the driving frequency and road surface roughness. The higher the driving frequency, the higher the maintenance priority. The higher the road surface roughness, the higher the maintenance priority. The maintenance priority may be calculated, for example, by a weighted sum or product of the driving frequency and the road surface roughness, or may be calculated according to a table showing the relationship between the driving frequency, road surface roughness, and maintenance priority. The maintenance road surface determination unit 15 may also calculate the maintenance priority in consideration of parameters other than the driving frequency and road surface roughness. For example, the maintenance road surface determination unit 15 may calculate the maintenance priority so that it increases with increasing driving speed or driving acceleration. For another example, the maintenance road surface determination unit 15 may calculate the maintenance priority so that it increases with increasing frequency of braking. For another example, the maintenance road surface determination unit 15 may calculate the maintenance priority so that it increases with increasing gradient of the section. The display control unit 16 generates maintenance instruction screen data representing the maintenance priority determined by the maintenance road surface determination unit 15 and displays it on the display. For example, the maintenance instruction screen data may include a map showing the road surface at the work site and a grid dividing the road surface into multiple sections, with each grid displayed in a different color according to the maintenance priority of the corresponding section (heat map).

[0027] FIG. 3 is a diagram showing an example of a maintenance instruction screen according to the first embodiment. In the maintenance instruction screen shown in FIG. 3, grids representing multiple sections of the road surface are superimposed on a top view of the work site. Each grid is colored according to its maintenance priority. By checking the maintenance instruction screen as shown in FIG. 3, the site supervisor can recognize sections with high maintenance priority. The site supervisor instructs the operator of the maintenance machine 30 to perform maintenance based on the maintenance priority.

[0028] In addition to the maintenance instruction screen, the display control unit 16 may also display a travel frequency screen showing the distribution of travel frequencies on a road surface, a road surface roughness image showing the distribution of road surface roughness, etc. FIG. 4 is a diagram showing an example of the travel frequency screen according to the first embodiment. According to the travel frequency screen shown in FIG. 4, grids representing multiple sections of the road surface are superimposed on a top view of the work site. Each grid is colored according to the travel frequency identified by the travel frequency identification unit 13. FIG. 5 is a diagram showing an example of a road surface roughness screen according to the first embodiment. According to the road surface roughness screen shown in FIG. 5, grids representing multiple sections of the road surface are superimposed on a top view of the work site. Each grid is colored according to the road surface roughness identified by the roughness identification unit 14.

[0029] <Road Surface Maintenance Plan by Management Device 10> Figure 6 is a flowchart showing a method for generating a road surface maintenance plan by the management device 10 according to the first embodiment. The vehicle body data acquisition unit 11 of the management device 10 receives vehicle body data from the transport vehicles 20 and maintenance machines 30 in a timely manner and records it in the vehicle body data storage unit 12. At the start of work, such as the start of a work shift at a work site, the management device 10 extracts vehicle body data for a predetermined period (e.g., the time period related to the previous work shift) from the vehicle body data stored in the vehicle body data storage unit 12 (step S1).

[0030] The travel frequency identification unit 13 identifies the travel trajectory of each delivery vehicle 20 by arranging the positions indicated by the extracted vehicle body data of the plurality of delivery vehicles 20 in chronological order for each delivery vehicle 20 (step S2). Next, the travel frequency identification unit 13 calculates the number of times the travel trajectory identified in step S2 passes through each road section, and identifies the travel frequency (step S3).

[0031] Next, the roughness identification unit 14 identifies the time periods during which the transport vehicles 20 passed through each section from the travel trajectories identified in step S2 (step S4). The roughness identification unit 14 identifies the road surface roughness of each section based on changes in suspension pressure during the identified time periods (step S5).

[0032] The maintenance road surface determination unit 15 calculates the maintenance priority of each section based on the travel frequency of each section identified in step S3 and the road surface roughness of each section identified in step S5 (step S6). The display control unit 16 generates maintenance instruction screen data representing the maintenance priority determined in step S6 and displays it on the display (step S7). This allows the site supervisor to identify sections requiring road surface maintenance at the start of a work shift and instruct the operator of the maintenance machine 30 to perform road surface maintenance. Note that, in another embodiment, the display control unit 16 may transmit the maintenance instruction screen data to the computer 37 of the maintenance machine 30 and display the maintenance instruction screen on a monitor in the cab of the maintenance machine 30. In this case, the operator of the maintenance machine 30 can perform road surface maintenance according to the display on the monitor.

[0033] <Effects> Thus, according to the first embodiment, the road surface maintenance system 1 executes the following processes. The travel frequency identification unit 13 identifies the travel frequency of the work machine (haulage vehicle 20) traveling on the road surface at the work site for each section of the road surface. The maintenance road surface determination unit 15 determines the section of the road surface at the work site to be maintained based on the travel frequency. This allows the site supervisor at the work site to recognize the section to be maintained before receiving a request from the operator of the haulage vehicle 20.

[0034] In the road surface maintenance system 1 according to the first embodiment, the roughness identification unit 14 further identifies roughness information of the road surface of the section on which the work machine has traveled, and the maintenance road surface determination unit 15 determines the section to be maintained based on the travel frequency and the road surface roughness information. According to the first embodiment, it is possible to determine the section to be maintained appropriately from the perspectives of both the roughness information and the travel frequency. In other embodiments, the road surface maintenance system 1 may determine the section to be maintained based solely on the travel frequency, without relying on the roughness information.

[0035] Second Embodiment The road surface maintenance system 1 according to the first embodiment presents the site supervisor with sections to be maintained. In contrast, the road surface maintenance system 1 according to the second embodiment further presents the site supervisor with the results of road surface maintenance performed by the maintenance machine 30.

[0036] 7 is a schematic block diagram showing the configuration of a management device 10 according to a second embodiment. The management device 10 according to the second embodiment further includes a maintenance frequency identification unit 17 and a road surface data storage unit 18 in addition to the configuration of the first embodiment.

[0037] The maintenance frequency identification unit 17 identifies the maintenance frequency for each section of the road surface based on the vehicle body data of the maintenance machine 30 recorded in the vehicle body data storage unit 12. For example, the maintenance frequency identification unit 17 identifies the maintenance frequency using the following procedure. The maintenance frequency identification unit 17 extracts a partial time series in which the maintenance machine 30 traveled with the blade 32 lowered from the time series of the vehicle body data of the maintenance machine 30. For example, the maintenance frequency identification unit 17 extracts the partial time series by extracting vehicle body data in which the height of the blade 32 is equal to or less than a predetermined height. The maintenance frequency identification unit 17 identifies the maintenance trajectory of the maintenance machine 30 represented by the extracted partial time series, and calculates the number of times the maintenance machine 30 passed through each section within a certain period of time, thereby identifying the maintenance frequency. Sections with a high maintenance frequency are sections where the road surface is prone to deterioration, and therefore it can be seen that maintenance is inefficient.

[0038] The road surface data storage unit 18 stores the calculation time, travel frequency, road surface roughness, maintenance priority, and maintenance frequency for each section of the road surface in association with each other.

[0039] 8 is a flowchart showing a method for generating a road surface maintenance plan by the management device 10 according to the second embodiment. The management device 10 according to the second embodiment executes the processes of steps S1 to S7 in the same manner as in the first embodiment, and displays a maintenance instruction screen on the display.

[0040] Next, the maintenance frequency identification unit 17 extracts a partial time series of vehicle body data for which the blade 32 height is equal to or less than a predetermined height from the vehicle body data of the multiple maintenance machines 30 acquired in step S1 (step S8). The maintenance frequency identification unit 17 identifies the maintenance trajectory of the maintenance machine 30 represented by the extracted partial time series, and identifies the maintenance frequency of each section by calculating the number of times the maintenance machine 30 passed through each section (step S9). The management device 10 then records the travel frequency, road surface roughness, maintenance frequency, and maintenance priority identified for each section in the road surface data storage unit 18 in association with the current time (step S10).

[0041] The display control unit 16 reads the road surface roughness at the start of the current work shift and the road surface roughness at the start of the previous work shift, which are recorded in the road surface data storage unit 18, and calculates the difference in road surface roughness for each section (step S11). The difference in road surface roughness at the start of the current work shift and the road surface roughness at the start of the previous work shift represents the road surface maintenance performance by the maintenance machine 30 during the previous work shift. The display control unit 16 generates maintenance performance screen data representing the calculated road surface roughness difference and displays it on the display (step S12). FIG. 9 is a diagram showing an example of a maintenance performance screen according to the second embodiment. The maintenance performance screen shown in FIG. 9 includes an area representing the road surface roughness before the maintenance work, an area representing the road surface roughness after the maintenance work, and an area representing the difference in road surface roughness before and after the maintenance work. This allows the site supervisor to recognize the status of the maintenance work being performed by the maintenance machine 30.

[0042] The display control unit 16 may also display a maintenance frequency screen showing the maintenance frequencies recorded in the road surface data storage unit 18. According to the maintenance frequency screen, grids representing multiple sections of the road surface are superimposed on a top view of the work site. Each grid is colored according to its maintenance frequency. Sections with a high maintenance frequency are presumed to be prone to further deterioration of the road surface or to be difficult to maintain. By looking at the maintenance frequency screen, the site supervisor can consider, for example, the placement of maintenance machines 30 or changes to the travel route of the transport vehicle 20.

[0043] Other Embodiments Although one embodiment has been described in detail above with reference to the drawings, the specific configuration is not limited to the above, and various design modifications are possible. That is, in other embodiments, the order of the above-described processes may be changed as appropriate. Furthermore, some processes may be executed in parallel. The management device 10 according to the above-described embodiment may be configured by a single computer, or the configuration of the management device 10 may be distributed across multiple computers, and the multiple computers may function as the management device 10 by cooperating with each other. In this case, some of the computers configuring the management device 10 may be installed in the computer of the transport vehicle 20 or the maintenance machine 30. For example, the computer 27 of the transport vehicle 20 may calculate road surface roughness from the measurement data acquired by the suspension pressure sensor 25 and transmit data representing the road surface roughness to the management device 10.

[0044] In the above-described embodiment, a transport vehicle 20 such as a dump truck is given as an example of a work machine traveling on a work site, but this is not limited to this. For example, in other embodiments, the work machine traveling on a work site may be a work machine that performs excavation work, such as a hydraulic excavator or a bulldozer. Furthermore, while the maintenance machine 30 in the above-described embodiment is a motor grader, this is not limited to this. For example, the maintenance machine 30 in other embodiments may be another maintenance machine, such as a bulldozer or a road roller.

[0045] In the above-described embodiment, the management device 10 displays the maintenance priorities of multiple sections, but this is not limited thereto. For example, in another embodiment, the management device 10 may determine one of the multiple sections to be maintained and present the location of the section to the site supervisor. Furthermore, the management device 10 according to another embodiment may include an instruction unit that determines the section to be maintained and outputs an automatic maintenance instruction for the determined section to the unmanned maintenance machine 30. In the above-described embodiment, the road surface maintenance system 1 includes a travel frequency identification unit 13 that identifies the travel frequency of each road section of the haulage vehicle 20 traveling on the road surface at the work site, and a maintenance road surface determination unit 15 that determines the section of the road surface at the work site to be maintained based on the travel frequency. The road surface maintenance system 1 may also include a roughness identification unit 14 that identifies road surface roughness information of the section on which the haulage vehicle 20 has traveled, and the maintenance road surface determination unit 15 may determine the section to be maintained based on the travel frequency and the road surface roughness information. The road surface roughness information may be calculated based on the detection value of a suspension pressure sensor 25 provided in the haulage vehicle 20. The road surface maintenance system 1 may include a display control unit 16 that generates a signal for displaying roughness information of the section after maintenance. The road surface maintenance system 1 may include a maintenance frequency specifying unit 17 that specifies the maintenance frequency for each section of the road surface by a maintenance machine 30 that maintains the road surface at the work site, and the maintenance road surface determination unit 15 may determine the section to be maintained based on the travel frequency and the maintenance frequency. The transport vehicle 20 may be a dump truck, and the maintenance machine 30 may be a motor grader. The travel frequency specifying unit 13 may specify the travel frequency for each section based on position information of the transport vehicle 20. The maintenance road surface determination unit 15 may calculate the maintenance priority for multiple sections. The road surface maintenance system 1 may include a display control unit 16 that generates a signal for displaying the priority. The road surface maintenance system 1 may include an instruction unit that outputs information about the section to be maintained determined by the maintenance road surface determination unit 15.

[0046] 1...Road surface maintenance system 10...Management device 11...Vehicle body data acquisition unit 12...Vehicle body data storage unit 13...Travel frequency identification unit 14...Roughness identification unit 15...Maintenance road surface determination unit 16...Display control unit 17...Maintenance frequency identification unit 18...Road surface data storage unit 20...Transport vehicle 21...Vehicle body 22...Vessel 23...Wheel 24...Suspension cylinder 25...Suspension pressure sensor 26...Positioning device 27...Computer 30...Maintenance machine 31...Vehicle body 32...Blade 33...Lift cylinder 34...Lift stroke sensor 35...Wheel 36...Positioning device 37...Computer

Claims

1. A road surface maintenance system comprising: a travel frequency identification unit that identifies the travel frequency for each section of a road surface of a work machine that travels on the road surface of a work site; and a maintenance road surface determination unit that determines the section of the road surface of the work site to be maintained based on the travel frequency.

2. A road surface maintenance system as described in claim 1, further comprising a roughness identification unit that identifies roughness information of the road surface of the section on which the work machine has traveled, and the maintenance road surface determination unit determines the section to be maintained based on the travel frequency and the road surface roughness information.

3. A road surface maintenance system according to claim 2, wherein the road surface roughness information is calculated based on the detection value of a suspension pressure sensor provided on the work machine.

4. A road surface maintenance system according to claim 2, further comprising: a display control unit that generates a signal for displaying roughness information of the section after maintenance.

5. A road surface maintenance system as described in claim 1, further comprising a maintenance frequency determination unit that determines the maintenance frequency for each section of the road surface by a maintenance machine that maintains the road surface at the work site, and the maintenance road surface determination unit determines the section to be maintained based on the driving frequency and the maintenance frequency.

6. The road surface maintenance system according to claim 5, wherein the work machine is a dump truck, and the maintenance machine is a motor grader.

7. The road surface maintenance system according to claim 1, wherein the travel frequency identification unit identifies the travel frequency for each section based on position information of the work machine.

8. A road surface maintenance system according to claim 1 or claim 2, wherein the maintenance road surface determination unit calculates the maintenance priorities for a plurality of sections.

9. The road surface maintenance system according to claim 8, further comprising: a display control unit that generates a signal for displaying the priority.

10. A road surface maintenance system according to claim 1 or claim 2, further comprising an instruction unit that outputs information relating to the section to be maintained determined by the maintenance road surface determination unit.

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