ROAD GENERATION SYSTEM AND FIELD WORK VEHICLE

Description

Technical Field

[0001] The present invention relates to a travel path generation system, and a field work vehicle.Background Art

[0002] Conventionally, there are travel path generation systems that generate a travel path for performing automatic travel in a field in work is performed by which different types of field work vehicles, and field work vehicles that employ such a travel path generation system.

[0003] In agricultural work in a field, various field work vehicles, such as a tractor equipped with a cultivating apparatus, a tractor equipped with a ploughing apparatus, a rice transplanter, a seeding machine, a fertilizer applicator, and a harvester (combine harvester), are used in accordance with seasons in agricultural work. The results of agricultural work performed by these field work vehicles should be information useful for subsequent field work vehicles that are to perform agricultural work later. However, thus far, individual ability of agricultural workers has been relied on to use such information, and the results of work performed by the preceding field work vehicles are hardly used by the subsequent field work vehicles using information technologies.

[0004] In a work information sharing system in Patent Document 1, a combine harvester, a tractor, and a rice transplanter are provided with a GPS communicating portion and a control device, and a shared recording device is prepared. The recording device is attached to the tractor during ploughing work, attached to the rice transplanter during planting work, and is attached to the combine harvester during harvest work. The traveling speed of the combine harvester during harvest work and information from the GPS communicating portion are recorded in the recording device, and the amount of fertilizer applied during planting work performed by the seedling planting machine is changed based on the information. For example, the traveling speed of the combine harvester decreases at a position where crops are overgrown, and thus, the amount of fertilizer applied is reduced at this position. Also, during ploughing work performed by the tractor prior to planting work, the ploughing depth is reduced at a position where crops are overgrown such that the fertilizer does not deposit at this position.

[0005] In a field management system in Patent Document 2, data on field work performed by a tractor, a rice transplanter, and a harvester is integrally stored and managed in a layer structure for the purpose of efficient agricultural business management in a field. For example, field outer-shape data is generated based on a travel trajectory that is obtained by the tractor traveling to circulate around the outer periphery of the field, and the generated data is stored. A crop planting position that is generated by the rice transplanter (seeding machine) traveling for work is stored in association with coordinate positions in a field. A yield per unit of travel that is generated in association with the travel position when the harvester travels for harvesting work is associated with a coordinate position in a field, and is stored as a yield per minute parcel in the field.Prior Art DocumentsPatent Documents

[0006] Patent Document 1: JP 2014-187954A Patent Document 2: JP 2017-068533A Disclosure of the InventionProblem to be Solved by the Invention

[0007] In the systems in Patent Documents 1 and 2, agricultural work information regarding various agricultural work machines is integrally managed field-by-field, and thus, the systems can contribute to an increase in the efficiency of agricultural planning. However, regarding calculation of a travel path with which each agricultural work machine automatically travels, no technology has been disclosed that calculates a travel path for an agricultural work machine that is scheduled to carry out agricultural work later, while giving consideration to a work state of an agricultural work machine that has previously carried out agricultural work.

[0008] In view of the foregoing situation, an object of the present invention is to provide a travel path calculation technology with which, when a travel path for automatic travel is set, consideration is given to a work state of a field work vehicle that has previously carried out work.Means for Solving Problem

[0009] A travel path generation system according to the present invention is a travel path generation system that generates a travel path for performing automatic travel in a field in which work is performed by different types of field work vehicles, and the system includes: a work information acquisition portion for acquiring work information regarding a preceding field work vehicle that has performed work previously in the field; and a path calculation portion for calculating, based on the work information from the work information acquisition portion, the travel path for a subsequent field work vehicle that is to perform automatic travel work hereafter in the field in which work has been performed by the preceding field work vehicle.

[0010] According to this configuration, when different types of field work vehicles perform work in the same field, work information regarding a field work vehicle that has performed work previously in this field (preceding field work vehicle) is acquired by the work information acquiring portion. Accordingly, the work state of the preceding field work vehicle can be read from work information that has been acquired by the work information acquiring portion. When a field work vehicle (subsequent field work vehicle) performs work later in the field in which the preceding field work vehicle has performed work, a travel path through which the subsequent field work vehicle is to automatically travel is calculated while giving consideration to the work state that is read from the work information. Thus, a travel path that is appropriate for the state of the field in which work is to be performed can be calculated, and work efficiency can be improved.

[0011] In the present invention, the preceding field work vehicle is a seedling row forming machine that forms seedling rows, such as a seeding machine or a rice transplanter, and the work information regarding the seedling row forming machine includes planted seedling row information indicating a seedling row formation map, and the subsequent field work vehicle is a harvester that has a harvesting portion in a machine-body front portion and harvests crops in the field while automatically traveling. In a preferred embodiment, the travel path for the harvester is calculated based on the planted seedling row information by the path calculation portion such that a path extending in a direction in which the seedling rows extend is elongated. When crops are harvested in a field in which planting or the like has been performed using a seedling row forming machine or the like, harvesting efficiency is increased by causing a harvester to travel along seedling rows. Accordingly, by employing the above-described configuration, the number of harvest travel paths that are perpendicular to the seedling rows and harvest travel paths that skew relative to the seedling rows can be minimized, and work efficiency improves.

[0012] Calculation of a travel path for a large-scale field and a field with a complex outer shape may not be appropriately performed due to, for example, restrictions of a travel path calculation algorithm. In that case, a dividing path that divides a field into a plurality of portions is set, and a travel path is separately calculated for divided fields that divided by the dividing path. However, if consideration is not given to the position, orientation, and the like of seedling rows in the divided fields in the calculation of the dividing path, a travel path portion that is perpendicular to the seedling rows and a travel path portion that skews relative to the seedling rows may possibly be elongated in a travel path that is calculated for each of the divided field. For this reason, in a preferable embodiment of the present invention, the path calculation portion includes a dividing path calculation portion for calculating a dividing path that divides the field, as one travel path for the harvester, and the dividing path calculation portion calculates the dividing path based on the planted seedling row information, such that the travel path in divided fields that are divided by the dividing path can be readily extended in the direction in which the seedling rows extend.

[0013] Furthermore, if a harvesting portion is provided with a plurality of dividers that sort planted grain culms by seedling row, the plurality of dividers are required to accurately proceed between the seedling rows. For this reason, in the present invention, the harvesting portion is provided with dividers that are arranged laterally, and the travel path is corrected so as to optimize positions of the seedling rows on an unworked area side that are calculated based on the planted seedling row information, and a position of one of the dividers, on an end side in a machine-body left-right direction. For example, if, at a boundary between an unharvested area and a harvested area, a divider on an end side in the left-right direction proceeds onto a boundary seedling row in the harvested area that is closest to the unharvested area, or between a boundary seedling row in the harvested area and a boundary seedling row in unworked area, as a result, all of the dividers proceed between the seedling rows, and thus, planted grain culms can be favorably sorted by the dividers.

[0014] If a field work vehicle that has large rear wheels, such as a tractor, or has crawler apparatuses travels in a field, large wheel tracks are left in a soft field, and an uneven surface occurs in the field. If a subsequent field work vehicle crosses such an uneven surface, vibration occurs that obstructs precise work travel. In addition, if a ridge is formed by a tractor and a subsequent field work vehicle crosses this ridge, the ridge will be partially destroyed. Accordingly, a travel path is preferable through which a subsequent field work vehicle does not cross an uneven surface or a ridge that is left by a preceding field work vehicle, as much as possible. For this reason, in a preferable embodiment of the present invention, the work information includes ridge information indicating a ridge formation map of ridges formed by a tractor, and the path calculation portion calculates the travel path such that the ridges are less often crossed by the subsequent field work vehicle.

[0015] If any of the wheels of a field work vehicle rides up a portion that protrudes upward from the field surface, such as a ridge or a dug portion, the machine body tilts in the left-right direction. In particular, if a tilt occurs during a turn such that the turn inner side is raised and the turn outer side is lowered, the turning travel becomes unstable. For this reason, in a preferable embodiment of the present invention, the work information includes ridge information indicating a ridge formation map of ridges formed by a tractor, and the path calculation portion calculates the travel path such that, when the subsequent field work vehicle turns, a turning inner portion of a traveling apparatus of the subsequent field work vehicle does not ride up the ridges.

[0016] The object of the present invention is not only the travel path generation system but also a field work vehicle that employs this travel path generation system. This field work vehicle includes the above-described travel path generation system, and also includes a vehicle position detection module that detects a vehicle position, and an automatic travel control portion that enables automatic travel based on the travel path calculated by the path calculation portion, and the vehicle position. The field work vehicle according to the present invention can utilize all of the effects of the travel path generation system, including the above-described preferable embodiments.Brief Description of the Drawings

[0017] FIG. 1 shows an embodiment (which also applies to FIGS. 7 to 12), and is a schematic diagram showing a basic configuration of a travel path generation system. FIG. 2 is a side view of a normal combine harvester, which is an example of a harvester. FIG. 3 shows an overview of automatic travel of the normal combine harvester. FIG. 4 shows a travel path for automatic travel. FIG. 5 is a functional block diagram showing a configuration of a control system of the combine harvester. FIG. 6 is a side view of a self-threshing combine harvester, which is an example of a harvester. FIG. 7 is a plan view of the self-threshing combine harvester. Best Mode for Carrying out the InventionFirst EmbodimentBasic Configuration of Travel Path Generation System

[0018] The basic principle of the travel path generation system according to the present invention will be described with reference to FIG. 1. This travel path generation system generates a travel path through which different types of field work vehicles automatically travel in a field. FIG. 1 shows a tractor, a rice transplanter (which may alternatively be a seeding machine), and a harvester (a normal combine harvester), as field work vehicles that perform work in the same field at different times. The rice transplanter and the seeding machine form rows of seedlings, which are planted grain culms, in the field, and are therefore also called seedling row forming machines. Work information, which includes a travel path map that indicates a travel trajectory of a preceding field work vehicle that has performed work previously in the field, is stored and managed in a work information database or the like. A travel path for a subsequent field work vehicle that is about to work hereafter is calculated while giving consideration to the work information regarding the preceding field work vehicle that has performed work previously.

[0019] If the subsequent field work vehicle that is to work hereafter is a harvester such as a combine harvester, planted seedling row information, which includes a seedling row formation map that indicates seedling rows formed by the seeding machine or the rice transplanter that has performed work previously, is stored as work information and managed in the work information database or the like. Thus, this seedling row formation map can be used to calculate a travel path for the harvester. For example, a path calculation algorithm for calculating a travel path can calculate a travel path for the harvester such that a travel path portion extending in a direction in which seedling rows extend is elongated, while giving consideration to the seedling row formation map.

[0020] If the subsequent field work vehicle that is to work hereafter is a harvester such as a combine harvester, ridge information, which includes a ridge formation map that indicates positions of ridges formed by a tractor that has performed work previously, and is stored as work information and managed in the work information database or the like. Thus, the ridge formation map can be used to calculate a travel path for the harvester. For example, the path calculation algorithm can calculate a travel path for the harvester such that the harvester less often crosses the ridges, while giving consideration to the ridge formation map. Furthermore, when the harvester turns, the path calculation algorithm can calculate a travel path for the harvester such that a traveling apparatus (crawler; wheel) on the turning inner side of the harvester does not ride up a ridge.

[0021] Conventionally, if the scale of the field in which a field work vehicle performs work is large, or if the field has a complex outer shape, a method is employed in which a dividing path is determined at the beginning of work, and the field is divided into two or more sections by the field work vehicle traveling for work through the dividing path. To employ the dividing path in the present invention as well, the path calculation algorithm can also be provided with a function of calculating the dividing path. With this path calculation algorithm, the dividing path is calculated based on the seedling row formation map that is read out from the work information that is stored and managed, such that travel paths in divided fields divided by the dividing path can be readily extended in the direction in which the seedling rows extend.

[0022] The work information related to work performed by different types of field work vehicles in the same field is stored after divided into a field map layer and work information layers for the respective types, as schematically shown in FIG. 1. Thus, management of the work information is facilitated. The work information layers in which work information regarding the respective types of field work vehicles is stored include travel path maps (all types), a seedling row formation map (rice transplanter or seeding machine), a ridge formation map (tractor), a yield map (harvester), and the like.Overall Configuration of Combine Harvester

[0023] Next, a description will be given while taking a normal combine harvester as a harvester that is an example of a field work machine that employs the travel path generation system of the present invention. Note that, in the present specification, "front / forward" (a indicated by an arrow F shown in FIG. 2) means a forward direction in the machine-body front-rear direction (travel direction), and "rear / rearward" (a direction indicated by an arrow B shown in FIG. 2) means a rearward direction in the machine-body front-rear direction (travel direction), unless otherwise stated. A left-right direction, or a lateral direction, means a machine-body transverse direction (machine-body width direction) that is perpendicular to the machine-body front-rear direction. "Upper / above" (a direction indicated by an arrow U shown in FIG. 2) and "lower / below" (a direction indicated by an arrow D shown in FIG. 2) refers to a positional relationship in the vertical direction of a vehicle body, and indicates a relationship in terms of a ground height.

[0024] As shown in FIG. 2, the combine harvester includes a machine body 210, crawler-type traveling apparatuses 211, an operation section 212, a threshing apparatus 213, a grain tank 214, a harvesting portion H2, a conveyance apparatus 216, a grain discharge apparatus 218, and a satellite positioning module 280.

[0025] The traveling apparatuses 211 are provided below the machine body 210. The combine harvester is configured to be automotive with the traveling apparatuses 211. The operation section 212, the threshing apparatus 213, and the grain tank 214 are provided above the traveling apparatuses 211 and constitute the upper part of the machine body 210. An operator who operates the combine harvester or an observer who monitors work of the combine harvester can board the operation section 212. Note that the observer may monitor the work of the combine harvester from outside the combine harvester.

[0026] The grain discharge apparatus 218 is coupled to a rear lower portion of the grain tank 214. The satellite positioning module 280 is attached to the upper front portion of the operation section 212.

[0027] The harvesting portion H2 is provided in a front portion of the machine body 210. The conveyance apparatus 216 is provided on the rear side of the harvesting portion H2. The harvesting portion H2 has a cutting mechanism 215 and a reel 217.

[0028] The cutting mechanism 215 reaps planted grain culms in the field. The reel 217 rakes planted grain culms to be harvested, while being driven to rotate. This configuration enables the combine harvester to travel for work using the traveling apparatuses 211, while harvesting grains (a kind of farm produce) in the field using the harvesting portion H2.

[0029] Reaped grain culms reaped by the cutting mechanism 215 are conveyed to the threshing apparatus 213 by the conveyance apparatus 216. The reaped grain culms undergo a threshing process in the threshing apparatus 213. The grains (a kind of harvest) obtained through the threshing process are stored in the grain tank 214. The grains stored in the grain tank 214 are discharged to the outside of the vehicle by the grain discharge apparatus 218, as needed.

[0030] A communication terminal 204 is disposed in the operation section 212. In this embodiment, the communication terminal 204 is fixed to the operation section 212. The communication terminal 204 may be attachable to and detachable from the operation section 212, or may be located outside the machine body of the combine harvester.Configuration Related to Automatic Travel

[0031] As shown in FIG. 3, this combine harvester can automatically travel along a travel path that is set in a field. For this purpose, the satellite positioning module 280 receives a GNSS (global navigation satellite system) signal (including a GPS signal) from an artificial satellite GS2, and outputs positioning data for calculating a vehicle position. The vehicle position is calculated based on this positioning data.

[0032] A procedure employed in the case of performing harvest work in a field using this combine harvester is as described below.

[0033] First, an operator / observer manually operates the combine harvester, and travels for harvesting so as to circulate along a boundary line of the field in an outer-peripheral portion within the field, as shown in FIG. 3. An area that has thus become a harvested area is set as an outer-peripheral area SA2. An area that is left as an unharvested area inward of the outer-peripheral area SA2 is set as a work target area CA2.

[0034] At this time, the observer causes the combine harvester to travel to circulate three to four times in order to secure the width of the outer-peripheral area SA2 widely to some extent. During this travel, the width of the outer-peripheral area SA2 increases by the working width of the combine harvester, every time the combine harvester circulates once. After the combine harvester has finished traveling to circulate three to four times at the beginning, the width of the outer-peripheral area SA2 is the width that is equal to three to four times the working width of the combine harvester.

[0035] The outer-peripheral area SA2 is used as a space with which the combine harvester changes its direction when traveling to harvest in the work target area CA2. The outer-peripheral area SA2 is also used as a space when the combine harvester moves to a grain discharging area after finishing harvest travel, and as a space for moving when the combine harvester moves to a refueling area, for example.

[0036] Note that a carrier vehicle CV2 shown in FIG. 3 can collect and transport grains discharged from the combine harvester. When grains are discharged, the combine harvester moves to the vicinity of the carrier vehicle CV2 and thereafter discharges the grains to the carrier vehicle CV2, using the grain discharge apparatus 218.

[0037] Upon the outer-peripheral area SA2 and the work target area CA2 being set, a travel path in the work target area CA2 is calculated, as shown in FIG. 4 The calculated travel path is sequentially set as a target travel path, based on a work travel pattern. The combine harvester is subjected to automatic travel control so as to travel along the set target travel path.Configuration of Combine Harvester Control System

[0038] FIG. 5 shows a control system of the combine harvester that uses the travel path generation system according to the present invention. FIG. 5 shows functional portions provided in a management computer 300, which is installed in a management center that provides a cloud service, and functional portions provided in the control system of the combine harvester. The functional portions provided in the management computer 300 can alternatively be provided in the control system of the combine harvester, or in the communication terminal 204 that is brought into the combine harvester.

[0039] The control system of the combine harvester is constituted by a large number of electronic control units that are called ECUs, various operational devices, a sensor group and a switch group, and a wired network such as an in-vehicle LAN for data transmission therebetween. A notification device 291 is a device for notifying the operator or the like of a work travel state and various warnings, and may include a buzzer, a lamp, a speaker, a display, or the like. The communicating portion 292 is used for the control system of the combine harvester to exchange data with the management computer 300 installed at a remote place and other communication terminals 204. The communication terminals 204 include a tablet computer that is operated by an observer who is standing in the field, or an observer (including the operator) who is sitting in the combine harvester. The control unit 206 is a core element of this control system, and is illustrated as an aggregate of a plurality of ECUs. The positioning data from the satellite positioning module 280 is input to the control unit 206 through the in-vehicle LAN.

[0040] The control unit 206 includes an output processing portion 206B and an input processing portion 206A as input and output interfaces. The output processing portion 206B is connected to a traveling device group 207A and a work device group 207B.

[0041] The traveling device group 207A includes operational devices related to vehicle travel, e.g. an engine control device, a gear shift control device, a brake control device, a steering control device, and the like. The work device group 207B includes operational devices in the harvesting portion H2, the threshing apparatus 213, the conveyance apparatus 216, the grain discharge apparatus 218, and the like.

[0042] A travel-related detection sensor group 208A, a work-related detection sensor group 208B, and the like, are connected to the input processing portion 206A. The travel-related detection sensor group 208A includes sensors for detecting the state of an engine speed adjustment tool, an acceleration pedal, a brake pedal, a gear shift operational tool, and the like. The work-related detection sensor group 208B includes sensors for detecting the apparatus state of the harvesting portion H2, the threshing apparatus 213, the conveyance apparatus 216, and the grain discharge apparatus 218, as well as the state of grain culms and grains.

[0043] The control unit 206 includes a work information management module 205, a travel control portion 261, a work control portion 262, a path calculation portion 263, a harvest management portion 264, a vehicle position calculation portion 265, and a notification portion 266.

[0044] The notification portion 266 generates notification data based on a command or the like from the functional portions of the control unit 206, and gives the generated notification data to the notification device 291. The vehicle position calculation portion 265 calculates a vehicle position, which is the map coordinates (or field coordinates) of a portion of the machine body 210 that is set in advance, based on the positioning data that is sequentially sent from the satellite positioning module 280. The satellite positioning module 280 and the vehicle position detection module 265 constitute a vehicle position detection module for detecting the vehicle position. The travel control portion 261 has an engine control function, a steering control function, a vehicle speed control function, and the like, and gives a travel control signal to the traveling device group 207A. The work control portion 262 gives a work control signal to the work device group 207B in order to control operations of the harvesting portion H2, the threshing apparatus 213, the grain discharge apparatus 218, the conveyance apparatus 216, and the like.

[0045] The combine harvester according to this embodiment can travel both automatically (automatic steering) and manually (manual steering). For this reason, the travel control portion 261 includes a manual travel control portion 2611, an automatic travel control portion 2612, and a travel path setting portion 2613. Also, a travel mode switch (not shown) for selecting either an automatic travel mode of traveling with automatic steering to perform automatic travel work and a manual travel mode of traveling with manual steering to perform manual travel work is provided in the operation section 212. It is possible to switch from manual travel to automatic travel or from automatic travel to manual travel by operating the travel mode switch.

[0046] If the manual travel mode is selected, the manual travel control portion 2611 generates a control signal based on an operation performed by the operator, and thus controls the traveling device group 207A.

[0047] The travel path setting portion 2613 sets the travel path created by the path calculation portion 263 as a target travel path during automatic travel. Note that this travel path may also be used during manual travel as guidance for the combine harvester to travel along this travel path.

[0048] If the automatic travel mode is selected, the automatic travel control portion 2612 generates a control signal for automatic steering and a vehicle speed change, and controls the traveling device group 207A. A control signal related to automatic steering is generated so as to resolve an orientation shift and a position shift between the target travel path that is set by the travel path setting portion 2613 and the vehicle position calculated by the vehicle position calculation portion 265. A control signal related to a vehicle speed change is generated based on a vehicle speed value that is set in advance.

[0049] If the manual travel mode is selected, the work control portion 262 generates a control signal to control the work device group 207B, based on an operation performed by the operator. If the automatic travel mode is selected, the work control portion 262 also generates a control signal in accordance with a preset travel position or travel state, and controls the work device group 207B. Needless to say, even in the automatic travel mode, the work control portion 262 can also control the work device group 207B, at least partially based on an operation performed by the operator.

[0050] The combine harvester according to this embodiment includes the harvest management portion 264 as a yield measurement function of measuring the yield (harvest amount) per unit of travel, and a functional portion for measuring the taste (here, moisture and protein) of grains harvested per unit of travel. The harvest management portion 264 is provided with a harvest map generation portion 2641, and the harvest map generation portion 2641 generates a harvest map while associating the yield per unit of travel and the taste with the travel trajectory (vehicle position) of the machine body 210.

[0051] The work information management module 205 includes a work information generation portion 251, a work information acquisition portion 252, and a work information processing portion 253. The work information generation portion 251 generates work information, which is information regarding work that has actually been performed in the field (harvest work in the case of a combine harvester; cultivating work in the case of a tractor; seeding work or seedling planting work in the case of a seeding machine or a rice transplanter, etc.). The work information generated by the work information generation portion 251 of the combine harvester includes, as harvest information, a travel trajectory in the field, the yield (yield map) per unit parcel, the taste (quality map), and the like. The generated work information is linked with a field ID for specifying the field, a manager ID for specifying a manager who has engaged in the work, a field work vehicle ID for specifying the combine harvester that has performed the work, and the like, and is uploaded to the management computer 300, by the work information processing portion 253.

[0052] Furthermore, if the field work vehicle is a seeding machine or a rice transplanter, work information includes, as planting information, a seedling row formation map that indicates, for example, a travel trajectory in the field, a seedling row direction of seedlings that is obtained based on the travel trajectory, a fertilizer application map, and the like. If the field work vehicle is a tractor equipped with a cultivating apparatus, work information includes, as cultivation information, a travel trajectory in the field, a ridge formation map that includes a ridge extending direction that is obtained based on the travel trajectory, and the like.

[0053] The work information acquisition portion 252 downloads, from the management computer 300, work information regarding a preceding field work vehicle that has performed work previously in the field in which field work is to be performed hereafter.

[0054] The management computer 300 includes a communicating portion 301 that exchanges data with the communicating portion 292 of each field work vehicle, a field management portion 302, a work vehicle management portion 303, and a work information storage management portion 304. The field management portion 302 manages field information regarding each field in which work is performed by different types of field work vehicles. Field information includes a field owner, a field map, soil characteristics, planting history, and the like. The work vehicle management portion 303 manages work vehicle information, which includes an owner of a work vehicle, a type name, work vehicle specifications, travel distance, travel time, and the like.

[0055] The work information storage management portion 304 stores and manages work information that is generated and uploaded by the work information generation portions 251 of not only the combine harvester but also other field work vehicles, in the form in which the work information is linked with corresponding field information and corresponding work vehicle information. For example, the work information storage management portion 304 can store and manage work information in a work information layer structure for each field and each field work vehicle, as shown in FIG. 1. Thus, the work information storage management portion 304 can send, to a field work vehicle that is to work hereafter, work information regarding a field work vehicle that has performed work previously in the same field.

[0056] For example, when the combine harvester performs harvest work in a specific field, the work information acquisition portion 252 downloads, from the management computer 300, planted seedling row information that includes a seedling row formation map included in the work information generated by a rice transplanter that has previously performed seedling planting work in the field. Next, the work information processing portion 253 obtains a direction in which seedling rows extend, based on the acquired seedling row formation map, and gives the obtained direction in which seedling rows extend to the path calculation portion 263. The path calculation portion 263 calculates a travel path such that a path extending along the direction in which seedling rows extend is as long as possible.

[0057] The path calculation portion 263 in this embodiment includes a dividing path calculation portion 2631 for calculating a dividing path. When harvest work using a dividing path is first performed in a field, the dividing path calculation portion 2631 calculates a dividing path such that travel paths in divided fields divided by the dividing path can be readily extended in the direction in which seedling rows extend.Variations

[0058] (1) In the above-described embodiment, a normal combine harvester has been taken as an example of a harvester. FIGS. 6 and 7 show a self-threshing combine harvester as a different type of harvester. A normal combine harvester and a self-threshing combine harvester have similar configurations, as is clear from comparison between FIGS. 2 and 6. However, the self-threshing combine harvester is provided with a plurality of dividers 219 and a pull-out apparatus 220, in place of the reel 217, in a front-end area of the harvesting portion H2. As shown in FIG. 7, the dividers 219, which are arranged at intervals of lows in the lateral direction, have a function of proceeding between the seedling rows and sorting planted grain culms by seedling row. The planted grain culms sorted by the dividers 219 are pulled out by the pull-out apparatus 220. The pulled-out planted grain culms are cut by the cutting mechanism 215. To cause the dividers 219 to accurately proceed between the seedling rows in the middle of work, a target travel path needs to be set such that the positional relationship between a seedling row serving as a boundary between an unharvested area and a harvested area and the dividers 219 is appropriate. For this purpose, the path calculation portion 263 has a function of correcting a travel path that is calculated in advance, so as to optimize the position of the seedling row on the unharvested area side that is calculated based on the planted seedling row information and the position of a divider 219 on an end side in the machine-body left-right direction. Examples of an optimum position of the divider 219 may be a position at which the divider 219 on an end side in the left-right direction proceeds at a boundary between the unharvested area and the harvested area, onto a boundary seedling row in the harvested area that is closest to the unharvested area, or between a boundary seedling row in the harvested area and a boundary seedling row in the unharvested area. Also, in order that the divider 219 comes at the aforementioned optimum position, the divider 219 may be configured such that the position of a leading end portion of the divider 219 can be changed in the machine-body left-right direction, and the divider 219 may be controlled such that the leading end of the divider 219 is located at a preferable position. (2) In the above embodiment, the field management portion 302, the work vehicle management portion 303, and the work information storage management portion 304 are provided in the management portion 300. Alternatively, a configuration may be employed in which the field management portion 302, the work vehicle management portion 303, and the work information storage management portion 304 are built in a portable communication terminal 204 that can be carried, brought into a field work vehicle that is to about to perform work, and exchange data with the work information management module 205. Furthermore, a configuration may be employed in which only required work information is recorded in advance in a storage medium such as a USB memory, and is transferred to the work information management module 205. (3) In the above embodiment, the work information management module 205 is provided in the control system of the field work vehicle. However, a configuration may alternatively be employed in which the work information management module 205 is also provided in the management computer 300, the communication terminal 204, or the like, creates work information based on data related to work that is sent from a field work vehicle, and sends necessary work information to the path calculation portion 263. Furthermore, a configuration may be employed in which the path calculation portion 263 is also provided in the management computer 300, the communication terminal 204, or the like, and a field work vehicle receives a calculated travel path therefrom. (4) The functional portions shown in FIG. 5 are divided mainly for the purpose of description. In practice, each of the functional portions may be integrated with other functional portions, or may be divided into a plurality of functional portions. (5) The harvester serving as a field work vehicle to which the present invention is applied may be not only self-threshing combine harvesters or normal combine harvesters for harvesting rice, wheat, or the like, but also combine harvesters for harvesting other farm products such as corn, and harvesters for harvesting carrot or the like. (6) The present invention is applicable to systems for generating a travel path for performing automatic travel in a field in which work is performed by different types of field work vehicles, and field work vehicles that use such a system.

[0059] Also, the embodiments disclosed in the present specification are examples. The embodiments of the present invention are not limited thereto, and may be altered, as appropriate, without departing from the scope of the claims.Description of Reference Signs

[0060] 210:Machine body 219:Divider 204:Communication terminal 205:Work information management module 251:Work information generation portion 252:Work information acquisition portion 253:Work information processing portion 206:Control unit 206A:Input processing portion 206B:Output processing portion 261:Travel control portion 2611:Manual travel control portion 2612:Automatic travel control portion 2613:Travel path setting portion 262:Work control portion 263:Path calculation portion 2631:Dividing path calculation portion 264:Harvest management portion 265:Vehicle position calculation portion 266:Notification portion 280:Satellite positioning module 291:Notification device 292:Communicating portion 300:Management computer 301:Communicating portion 302:Field management portion 303:Work vehicle management portion 304:Work information storage management portion CA2:Work target area H2:Harvesting portion SA2:Outer-peripheral area

Claims

1. A travel path generation system that generates a travel path for performing automatic travel in a field in which work is performed by different types of field work vehicles, the system comprising: a work information acquisition portion (252) for acquiring work information regarding a preceding field work vehicle that has performed work previously in the field; and a path calculation portion (263) for calculating, based on the work information from the work information acquisition portion (252), the travel path for a subsequent field work vehicle that is to perform automatic travel work hereafter in the field in which work has been performed by the preceding field work vehicle, wherein the preceding field work vehicle is a seedling row forming machine that forms seedling rows, such as a seeding machine or a rice transplanter, and the work information regarding the seedling row forming machine includes planted seedling row information indicating a seedling row formation map, and the subsequent field work vehicle is a harvester that has a harvesting portion (H2) in a machine-body front portion and harvests crops in the field while automatically traveling; characterized in that: the harvesting portion (H2) is provided with dividers (219) that are arranged laterally, and the travel path is corrected so as to optimize positions of the seedling rows on an unworked area side that are calculated based on the planted seedling row information, and a position of one of the dividers (219), on an end side in a machine-body (10) left-right direction.

2. The travel path generation system according to claim 1, wherein the travel path for the harvester is calculated based on the planted seedling row information by the path calculation portion (263) such that a path extending in a direction in which the seedling rows extend is elongated.

3. The travel path generation system according to claim 2, wherein the path calculation portion (263) includes a dividing path calculation portion (2631) for calculating a dividing path that divides the field, as one travel path for the harvester, and the dividing path calculation portion (2631) calculates the dividing path based on the planted seedling row information, such that the travel path in divided fields that are divided by the dividing path can be readily extended in the direction in which the seedling rows extend.

4. The travel path generation system according to any one of claims 1 to 3, wherein the work information includes ridge information indicating a ridge formation map of ridges formed by a tractor, and the path calculation portion (263) calculates the travel path such that the ridges are less often crossed by the subsequent field work vehicle.

5. The travel path generation system according to any one of claims 1 to 4, wherein the work information includes ridge information indicating a ridge formation map of ridges formed by a tractor, and the path calculation portion (263) calculates the travel path such that, when the subsequent field work vehicle turns, a turning inner portion of a traveling apparatus (211) of the subsequent field work vehicle does not ride up the ridges.

6. A field work vehicle comprising: the travel path generation system according to any one of claims 1 to 5; a vehicle position detection module (80) for detecting a vehicle position; and an automatic travel control portion (512) for enabling automatic travel based on the travel path calculated by the path calculation portion (263) and the vehicle position.