Work management methods, work management systems, and work management programs
The work management method and system integrate work areas across unit periods by merging them based on positioning and time data, addressing the issue of divided work area management in agricultural operations.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- YANMAR HLDG CO LTD
- Filing Date
- 2022-08-05
- Publication Date
- 2026-05-15
AI Technical Summary
Existing work management systems divide work areas across management unit periods, such as from midnight to 24:00, when agricultural work extends into the night, leading to inaccurate work area management.
A work management method and system that combines work areas across management unit periods by identifying and merging work areas based on operational information, including positioning and time data, to accurately reflect continuous work operations.
Enables seamless management of work areas across unit periods without division, providing accurate and integrated work area data for agricultural operations.
Smart Images
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Abstract
Description
Technical Field
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[0001] The present invention relates to a work management method, a work management system, and a work management program, and can be suitably used, for example, for managing work such as farming work in a field.
Background Art
[0002] Patent Document 1 (Patent No. 5972819) discloses a work management support device and a work management system. The work management support device in Patent Document 1 detects the position of a worker, obtains the time when the work machine used by the worker operates and the operating state, and automatically records this information on a remote server in order to manage the work performed by the farmer in the field.
Prior Art Document
Patent Document
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] In Patent Document 1, the work record is made on a daily basis as a premise. However, for example, in the crop harvesting work, due to weather conditions or the convenience of sharing agricultural machinery used for harvesting, the harvesting work may extend into the night and even cross midnight. In such a case, in Patent Document 1, since the unit period for managing the work is one day from midnight to 24:00 at night, the work date and time in management are divided at midnight, and the work area in management is also divided.
[0005] In view of the above situation, one object of the present disclosure is to provide a work management method, a work management system, and a work management program that can manage the work area where work is performed across the management unit period without dividing it. Other problems and novel features will become apparent from the description of this specification and the accompanying drawings. [Means for solving the problem]
[0006] The means for solving the problem are described below using the numbers and symbols used in the embodiments for carrying out the invention. These numbers and symbols are added in parentheses for reference to show an example of the correspondence between the claims and the embodiments for carrying out the invention. Therefore, the claims should not be interpreted restrictively because of the parenthetical statements.
[0007] According to one embodiment, the work management method includes acquiring operational information (S01) that associates positioning information representing multiple positions of the work device (2) that performed work while moving within the field (9) during the drive period (WP14) from the key-on state to the key-off state with time information representing multiple positioning times when the work device (2) was at each of the multiple positions. The work management method further includes identifying the work area (WA13, WA21) in the field (9) where the work device (2) performed work, based on the operational information (S02) for each predetermined management unit period (MP1, MP2), and determining whether the drive period (WP14) crosses a predetermined reference time (T1) that separates the first management unit period (MP1) from the second management unit period (MP2) that follows the first management unit period (MP1) (S03). The work management method further includes, when the drive period (WP14) crosses the reference time (T1), managing a combined work area (WA14) which is formed by combining a first work area (WA13) in which the work device (2) performed work during the first drive period (WP13) included in the first management unit period (MP1) of the drive period (WP14), and a second work area (WA21) in which the work device (2) performed work during the second drive period (WP21) included in the second management unit period (MP2) of the drive period (WP14), in association with the first management unit period (MP1) (S04).
[0008] According to one embodiment, the work management system (1) comprises an acquisition unit (521), an identification unit (522), a determination unit (523), and a management unit (524). The acquisition unit (521) acquires operational information that associates positioning information representing multiple positions of the work device (2) that performed work while moving within the field (9) during the drive period (WP14) from the key-on state to the key-off state, with time information representing multiple positioning times when the work device (2) was at each of the multiple positions. The identification unit (522) identifies the work areas (WA13, WA21) within the field (9) where the work device (2) performed work, based on the operational information, for each predetermined management unit period (MP1, MP2). The determination unit (523) determines whether the drive period (WP14) crosses a predetermined reference time (T1) that separates the first management unit period (MP1) from the second management unit period (MP2) that follows the first management unit period (MP1). When the drive period (WP14) crosses the reference time (T1), the management unit (524) manages a combined work area (WA14) which is formed by combining the first work area (WA13) during the first drive period (WA13) included in the first management unit period (MP1) of the drive period (WP14) and the second work area (WA21) during the second drive period (WA21) included in the second management unit period (MP2) of the drive period (WP14), associating it with the first management unit period (MP1).
[0009] According to one embodiment, the work management program is used to perform predetermined processing by having the arithmetic unit (52) execute it. This processing includes acquiring operational information (S01) that associates positioning information representing multiple positions of the work device (2) that performed work while moving within the field (9) during the drive period (WP14) from the key-on state to the key-off state with time information representing multiple positioning times when the work device (2) was at each of the multiple positions. This processing further includes identifying the work area (WA13, WA21) in the field (9) where the work device (2) performed work, based on the operational information (S02) for each predetermined management unit period (MP1, MP2), and determining whether the drive period (WP14) crosses a predetermined reference time (T1) that separates the first management unit period (MP1) from the second management unit period (MP2) that follows the first management unit period (MP1) (S03). This process further includes, when the drive period (WP14) crosses the reference time (T1), managing a combined work area (WA14) in association with the first management unit period (MP1), which is formed by combining a first work area (WA13) in which the work device (2) performed work during the first drive period (WP13) included in the first management unit period (MP1) of the drive period (WP14), and a second work area (WA21) in which the work device (2) performed work during the second drive period (WP21) included in the second management unit period (MP2) of the drive period (WP14). (S04) [Effects of the Invention]
[0010] According to one embodiment, work areas where work is performed across management unit periods can be managed without being divided. [Brief explanation of the drawing]
[0011] [Figure 1] Figure 1 shows an example configuration of a work management system according to one embodiment. [Figure 2] Figure 2 is a block circuit diagram showing one example configuration of a work management device according to one embodiment. [Figure 3]Figure 3 is a flowchart showing an example of the configuration of a work method according to one embodiment. [Figure 4] Figure 4 shows an example of the pre-combination work period according to one embodiment. [Figure 5] Figure 5 shows an example of a work area before joining according to one embodiment. [Figure 6] Figure 6 shows an example of the working period after coupling according to one embodiment. [Figure 7] Figure 7 shows an example of a combined work area according to one embodiment. [Modes for carrying out the invention]
[0012] (Embodiment) To automatically manage agricultural work performed by work equipment while it moves around the field, there is a technology that records positioning information, which measures the location of the work equipment at multiple points in time during the work. By processing the positioning information in batches, for example, for each management unit period such as one day, it is possible to efficiently manage the field, such as automatically identifying the work area where work was performed the previous day. However, with such technology, for work performed across two management unit periods, a single work area that was actually worked on in one operation may be divided into two work areas in the data. This disclosure automatically performs a process to combine the two divided work areas into one, even for work performed across two management unit periods, to reflect the actual situation.
[0013] Referring to the attached drawings, the forms for implementing the work management method, work management system, and work management program described herein are described below.
[0014] As shown in Figure 1, one embodiment of the work management system 1 comprises a mounted terminal 3 attached to a work device 2 and a work management device 5. The work management system 1 may further include an external terminal 6. For example, the external terminal 6 may include a smartphone or a tablet device.
[0015] The working device 2 includes working vehicles such as tractors and combines that perform agricultural work while moving on the ground in the farm field 9. The working device 2 may further include a drone or the like that performs agricultural work while flying above the farm field 9.
[0016] The mounted terminal 3, the work management device 5, and the external terminal 6 transmit and receive various information through wireless communication and / or wired communication via the network 4. As an example, when the working device 2 is working while moving within the farm field 9, the mounted terminal 3 transmits operation information including position information measured by GNSS (Global Navigation Satellite System) or the like at a plurality of points passed through, to the work management device 5 via the network 4. The work management device 5 manages work information related to the work area where the working device 2 has performed work, based on the received operation information. The external terminal 6 may receive and output the work information managed by the work management device 5 via the network 4.
[0017] As shown in FIG. 2, the work management device 5 according to an embodiment may be configured as a so-called computer. In the example of FIG. 2, the work management device 5 includes a bus 51, an arithmetic unit 52, a storage device 53, a communication device 54, and an input / output device 55. The bus 51 is configured to connect the arithmetic unit 52, the storage device 53, the communication device 54, and the input / output device 55 so that they can communicate with each other.
[0018] The arithmetic unit 52 includes an acquisition unit 521, a specification unit 522, a determination unit 523, and a management unit 524. The storage device 53 includes a work management program storage unit 531 and a database 532. The work management program storage unit 531 stores a work management program. The database 532 stores operation information and work information.
[0019] The arithmetic unit 52 realizes the respective functions of the acquisition unit 521, the specification unit 522, the determination unit 523, and the management unit 524 by reading and executing a work management program. Each of the acquisition unit 521, the specification unit 522, the determination unit 523, and the management unit 524 is a virtual functional block that executes a process realized by the cooperation of the arithmetic unit 52 and the storage device 53. The acquisition unit 521 acquires the operation information transmitted from the mounted terminal 3. The specification unit 522 specifies, for each management unit period, the work area in the farmland 9 where the work device 2 has performed work. The determination unit 523 determines whether the driving period straddles two consecutive management unit periods delimited by a reference time. The management unit 524 manages by associating the work area with the management unit period. More specific processes of these functional blocks will be described later.
[0020] The work management program may be read from an external recording medium 530 and stored in the work management program storage unit 531. The recording medium 530 may be a non-transitory and tangible medium.
[0021] The communication device 54 communicates with external devices including the mounted terminal 3 and / or the external terminal 6 by wireless communication and / or wired communication via the network 4.
[0022] The input / output device 55 outputs information to the user and receives operations input by the user. As an example, the input / output device 55 includes a display device that outputs an image, a keyboard that receives input, and / or a mouse, etc.
[0023] Referring to the flowchart of FIG. 3, an example of the process of the work management method according to an embodiment will be described. The process of the work management method may start when the work management device 5 is activated. At this time, the arithmetic unit 52 of the work management device 5 executes the work management program, whereby the process of the work management method is realized.
[0024] When the flowchart in Figure 3 starts, step S01 is executed. In step S01, the acquisition unit 521 of the work management device 5 acquires the operation information transmitted by the mounted terminal 3.
[0025] More specifically, first, the onboard terminal 3 mounted on the work device 2 generates operational information and transmits it to the work management device 5. The operational information is generated by the onboard terminal 3 by associating positioning information, which is the position of the work device 2 measured at multiple times, time information, which represents the measurement time when the position was measured, and status information, which represents the operational status of the work device 2. The position of the work device 2 may be measured periodically at predetermined sampling intervals. The status information indicates whether the work device 2 is in a key-on state or a key-off state. The measurement time may include multiple times within the driving period from when the work device 2 is in a key-on state until it is in a key-off state.
[0026] The acquisition unit 521 controls the communication device 54 to receive operational information and stores the acquired operational information in the database 532.
[0027] After step S01, step S02 in Figure 3 is executed. In step S02, the identification unit 522 of the work management device 5 identifies the work area for each management unit period. Here, the work area is the area of the field 9 in which the work device 2 performed work during the operating period.
[0028] More specifically, the specific unit 522 calculates the work area based on multiple positioning points included in the operational information. As an example, the convex or concave hull of these multiple positioning points may be calculated and used as the work area.
[0029] Here, the identification unit 522 identifies the work area by performing batch processing or the like for each management unit period. For example, the process of identifying the work area of work performed during a certain management unit period may start after a predetermined time has elapsed from the reference time at which this management unit period ends. In this case, if the entire drive period is included in the management unit period, the work area is correctly identified to include all positioning points measured during the drive period. Conversely, if the drive period spans a reference time that separates two consecutive management unit periods, only the first part of the work area worked on by the work device 2 during this drive period, which includes only some of the positioning points whose positions were measured in the first management unit period immediately preceding the reference time, is identified as the work area. Furthermore, of the remaining part of the work area worked on by the work device 2 during the drive period, only the second part, which includes only the remaining positioning points whose positions were measured in the second management unit period immediately following the reference time, is identified as the work area.
[0030] In the example in Figure 4, the work device 2 performs work during the drive periods WP11, WP12, and WP13 included in the first management unit period MP1. Furthermore, the work device 2 also performs work during the drive periods WP21, WP22, and WP23 included in the subsequent second management unit period MP2. In the example in Figure 4, the drive periods WP11, WP12, and WP13 included in the first management unit period MP1 are shown with relatively sparse hatching, while the drive periods WP21, WP22, and WP23 included in the second management unit period MP2 are shown with relatively dense hatching. Here, the last drive period WP13 in the first management unit period MP1 and the first drive period WP21 in the second management unit period MP2 are actually the same drive period, but are divided into two parts in the management data, separated by the reference time T1.
[0031] In the example in Figure 5, within field 9, the work area WA13, where the work device 2 performed work during the drive period WP13, and the work area WA21, where the work device 2 performed work during the drive period WP21, are calculated separately. Work area WA13 is calculated as the convex hull of positioning point P1, which was positioned during the drive period WP13, among the multiple positioning points P1 and P2 included in the operation information. Similarly, work area WA21 is calculated as the convex hull of positioning point P2, which was positioned during the drive period WP21, among the multiple positioning points P1 and P2 included in the operation information. Thus, when a single drive period is divided into two in the management data because it crosses the reference time T1, the single work area is also divided into two in the management data. Furthermore, when calculating the work areas WA13 and WA21 as the convex hulls of positioning points P1 and P2, the convex hulls of positioning points P1 and P2 may be expanded outward by a predetermined expansion width around their entire circumference to approximate the area actually worked on by the work device 2. The expansion width may be determined based on the work width of the work device 2 and the position of the positioning device that performs positioning on the work device 2. As an example of work width, if the work device 2 is equipped with a tractor and an implement towed by the tractor, the work width is defined as the length of the area in which the implement works on the field 9 in a direction perpendicular to the direction of travel of the tractor. As another example of work width, if the work device 2 is a rice transplanter, its planting width is defined as the work width, and if the work device 2 is a combine harvester, its harvesting width is defined as the work width. Also, as an example of expansion width, if the positioning device is located in the center of the work device 2 with respect to the direction of the work width, half of the work width may be defined as the expansion width. As another example of the magnification width, if the positioning device is positioned offset from the center of the work device 2 in the direction of the work width, the magnification width may also be offset in the direction of the work width.
[0032] In this disclosure, in the subsequent steps S03 and S04, a process is performed to combine the two divided work areas WA13 and WA21 into a single work area.
[0033] After step S02, step S03 in Figure 3 is executed. In step S03, the determination unit 523 of the work management device 5 determines whether the drive periods WP13 and WP21 cross the reference time T1.
[0034] More specifically, the determination unit 523 determines that, among the multiple positioning points P1 and P2 included in the operational information, the first positioning point P1, which was positioned at the last positioning time included in the first management unit period MP1 immediately preceding the reference time T1, and the second positioning point P2, which was positioned at the first positioning time included in the second management unit period MP2 immediately following the reference time T1, satisfy the following two conditions, and that the drive period WP13 including the positioning time of the first positioning point P1 and the drive period WP21 including the positioning time of the second positioning point P2 constitute a single drive period that spans the reference time T1.
[0035] The first condition is that both the first positioning point P1 and the second positioning point P2 were positioned when the work device 2 was in the key-on state. However, since the work device 2 is in the key-on state during the drive period, the positioning time included in the drive period satisfies the first condition. The second condition is that the time between the positioning time of the first positioning point P1 and the positioning time of the second positioning point P2 is less than or equal to a predetermined threshold. This threshold is, for example, twice the sampling period. In this case, only one positioning failure near the reference time T1 is permitted.
[0036] If the determination unit 523 does not determine that the drive periods WP13 and WP21 cross the reference time T1 (No), the process in the flowchart of Figure 3 ends. Conversely, if the determination unit 523 determines that the drive periods WP13 and WP21 cross the reference time T1 (Yes), the process proceeds to step S04 in Figure 3.
[0037] In step S04, the management unit 524 of the work management device 5 manages the work areas WA13 and WA21 that were worked on during the drive periods WP13 and WP21 that span the reference time T1, by combining them.
[0038] More specifically, in step S03, the management unit 524 combines the two drive periods WP13 and WP21, which are determined to be a single drive period spanning the reference time T1, into a single drive period, and manages the combined drive period by associating it with the management unit period immediately preceding the reference time T1.
[0039] Similarly, the two work areas WA13 and WA21, corresponding to the two drive periods WP13 and WP21 before merging, are merged into a single work area, and the merged work area is managed by associating it with the management unit period immediately preceding the reference time T1. Here, the merged work area may be calculated as the convex or concave hull of the set of positioning points P1 and P2 included in the work areas WA13 and WA21 before merging.
[0040] In the example in Figure 6, the drive periods WP13 and WP21, which were separated at the reference time T1 in the example in Figure 4, are combined and replaced with drive period WP14. The management unit 524 stores the management data, which associates the combined drive period WP14 with the first management unit period MP1, in the database 532.
[0041] In the example in Figure 7, the two work areas WA13 and WA21, which were separated in the example in Figure 5, are combined and replaced with work area WA14. In the example in Figure 7, the combined work area WA14 is the convex hull of the set of positioning points P1 included in the work area WA13 before combining and positioning points P2 included in the work area WA21 before combining. The management unit 524 stores management data that associates the combined work area WA14 with the first management unit period MP1 in the database 532.
[0042] The management data representing the combined drive period WP14 and the combined work area WA14 may be accessed using an external terminal 6. In this case, the user operates the external terminal 6 at a desired time, accesses the database 532 via the network 4, and requests the desired management data. The management unit 524 reads the specified management data from the database 532 in response to this request and sends it to the external terminal 6. The external terminal 6 outputs the received management data, for example, by displaying it on a screen. By displaying the combined drive period WP14 and / or the combined work area WA14 on the external terminal 6, the user can accurately grasp the actual work performed, including work performed across the reference time T1.
[0043] When step S04 in Figure 3 is completed, the processing in the flowchart in Figure 3 also ends.
[0044] As described above, according to one embodiment, the work area WA14, in which work is performed across management unit periods MP1 and MP2, can be managed without being divided.
[0045] The invention made by the inventor has been described in detail based on embodiments above, but it goes without saying that the present invention is not limited to these embodiments and can be modified in various ways without departing from its essence. Furthermore, the features described in the embodiments can be freely combined within a range that does not contradict the technical aspects.
[0046] (Note) The work management methods, work management systems, and work management programs described in each embodiment can be described as follows:
[0047] The work management method relating to the first aspect is: The system acquires operational information that associates positioning information representing multiple positions of the work device that moved and performed work within the field during the driving period from when the key was turned on to when the key was turned off, with time information representing multiple positioning times when the work device was at each of the multiple positions. For each predetermined management unit period, the work area within the field in which the work device performed the work is identified based on the operational information, The determination of whether the aforementioned driving period crosses a predetermined reference time that separates the first management unit period from the second management unit period following the first management unit period, When the drive period spans the reference time, a combined work area is formed by combining a first work area in which the work device performed the work during the first drive period included in the first management unit period of the drive period, and a second work area in which the work device performed the work during the second drive period included in the second management unit period of the drive period, and this combined work area is managed in association with the first management unit period. Includes.
[0048] The work management method relating to the second aspect is: A work management method relating to the first aspect, The above determination means that When the time from the last positioning time included in the first management unit period to the first positioning time included in the second management unit period among the plurality of positioning times is less than or equal to a predetermined threshold, it is determined that the drive period crosses the reference time. Includes.
[0049] The work management method relating to the third aspect is: A work management method relating to the second aspect, The interval between the aforementioned multiple positioning times is a predetermined sampling period. The threshold value is twice the sampling period.
[0050] The work management method relating to the fourth aspect is: A work management method relating to any of the first to third aspects, The aforementioned management is, The work area and the type of work performed by the work device in the work area are managed in association with each other. Includes.
[0051] The work management system relating to the fifth aspect is: An acquisition unit acquires operational information that associates positioning information representing multiple positions of a work device that moved and performed work within the field during the driving period from when the key was turned on to when the key was turned off, with time information representing multiple positioning times when the work device was at each of the multiple positions. For each predetermined management unit period, the identification unit identifies the work area within the field where the work device performed the work, based on the operation information, A determination unit that determines whether the drive period crosses a predetermined reference time that separates a first management unit period from the second management unit period following the first management unit period, When the drive period spans the reference time, a management unit manages a combined work area, which is a combination of a first work area where the work device performed the work during the first drive period included in the first management unit period of the drive period, and a second work area where the work device performed the work during the second drive period included in the second management unit period of the drive period, in association with the first management unit period. It is equipped with.
[0052] The work management program relating to the sixth aspect is: A task management program for achieving predetermined processing by having a computing device execute it, The aforementioned process is, The operation information obtained by associating positioning information, measured at multiple time points within the driving period from when the work device is turned on to when it is turned off, with time information representing the time when the position was measured, is obtained for the work device that moves and works within the field. For each predetermined management unit period, the work area within the field in which the work device performed the work is identified based on the operational information, The determination of whether the aforementioned driving period crosses a predetermined reference time that separates the first management unit period from the second management unit period following the first management unit period, When the drive period spans the reference time, a combined work area is formed by combining a first work area in which the work device performed the work during the first drive period included in the first management unit period of the drive period, and a second work area in which the work device performed the work during the second drive period included in the second management unit period of the drive period, and this combined work area is managed in association with the first management unit period. Includes. [Explanation of Symbols]
[0053] 1. Work Management System 2. Working equipment 3. Devices equipped with this device 4 Network 5 Work management device 51 Bus 52 Arithmetic unit 521 Acquisition Department 522 Specific part 523 Judgment section 524 Management Department 53 Storage device 530 Recording media 531 Work Management Program Storage Unit 532 Databases 54 Communication equipment 55 Input / Output Devices 6. External terminals 9 Fields MP1 Management Unit Period (First Management Unit Period) MP2 Management Unit Period (Second Management Unit Period) P1, P2 positioning points T1 Reference time WA13, WA21 working area (working area before merging) WA14 Work area (Work area after merging) WP11, WP12, WP13, WP14, WP21, WP22, WP23 Operating period
Claims
1. The work management device acquires operational information that associates positioning information representing multiple positions of a work device that moved within the field and performed work during the driving period from when the key was turned on until when the key was turned off, with time information representing multiple positioning times when the work device was at each of the multiple positions, The work management device identifies, at each predetermined management unit period, the work area within the field where the work device performed the work, based on the operational information. The work management device determines whether the drive period crosses a predetermined reference time that separates the first management unit period from the second management unit period following the first management unit period. When the drive period crosses the reference time, the work management device manages a combined work area, which is a combination of a first work area where the work device performed the work during a first drive period included in the first management unit period of the drive period, and a second work area where the work device performed the work during a second drive period included in the second management unit period of the drive period, in association with the first management unit period. Includes, The above determination means that The work management device determines that the drive period crosses the reference time when the time from the last positioning time included in the first management unit period to the first positioning time included in the second management unit period is less than or equal to a predetermined threshold. including, Work management methods.
2. In the work management method described in claim 1, The interval between the aforementioned multiple positioning times is a predetermined sampling period. The threshold is twice the sampling period. Work management methods.
3. In the work management method described in claim 1 or 2, The aforementioned management is, The work management device manages the work area and the type of work performed by the work device in the work area in association with each other. including Work management methods.
4. An acquisition unit acquires operational information that associates positioning information representing multiple positions of a work device that moved and performed work within the field during the driving period from when the key was turned on to when the key was turned off, with time information representing multiple positioning times when the work device was at each of the multiple positions. For each predetermined management unit period, the identification unit identifies the work area within the field where the work device performed the work, based on the operation information, A determination unit that determines whether the drive period crosses a predetermined reference time that separates a first management unit period from the second management unit period following the first management unit period, When the drive period spans the reference time, a management unit manages a combined work area, which is a combination of a first work area where the work device performed the work during the first drive period included in the first management unit period, and a second work area where the work device performed the work during the second drive period included in the second management unit period, in association with the first management unit period. Equipped with, The determination unit determines that the drive period crosses the reference time when the time from the last positioning time included in the first management unit period to the first positioning time included in the second management unit period is less than or equal to a predetermined threshold. Work management system.
5. A task management program for achieving predetermined processing by having a computing device execute it, The aforementioned process is, The system acquires operational information that associates positioning information representing multiple positions of the work device that moved and performed work within the field during the driving period from when the key was turned on to when the key was turned off, with time information representing multiple positioning times when the work device was at each of the multiple positions. For each predetermined management unit period, the work area within the field in which the work device performed the work is identified based on the operational information, The determination of whether the aforementioned driving period crosses a predetermined reference time that separates the first management unit period from the second management unit period following the first management unit period, When the aforementioned drive period spans the aforementioned reference time, a combined work area is formed by combining a first work area in which the work device performed the work during the first drive period included in the first management unit period of the aforementioned drive period, and a second work area in which the work device performed the work during the second drive period included in the second management unit period of the aforementioned drive period, and this combined work area is managed in association with the first management unit period. Includes, The above determination means that When the time from the last positioning time included in the first management unit period to the first positioning time included in the second management unit period among the plurality of positioning times is less than or equal to a predetermined threshold, it is determined that the drive period crosses the reference time. including, Work management program.