JP6141782B2 - Method for updating map information in a linked system of automated guided vehicle and inventory management system - Google Patents

Description

  The present invention relates to a map information updating method in a linked system of an automated guided vehicle and an inventory management system, and more particularly to a map information updating method in an linked system of an automated guided vehicle and an inventory management system that moves based on an environmental map.

  Position control technology for unmanned vehicles (autonomous mobile devices, robots, etc.) based on self-position estimation and environmental map creation already exists. In addition, there is a shape measurement of a predetermined area in an environment map by a laser light projecting / receiving device (laser range finder, laser distance sensor) mounted on an unmanned vehicle and reflection of the shape information on the map (for example, Patent Document 1 and Patent Document 2). ).

  There is also an inventory management system that updates warehouse inventory in real time based on loading and unloading work of automated guided vehicles and manned guided vehicles.

JP 2010-92147 A JP 2012-93811 A

  In a work environment where unmanned transport vehicles and manned transport vehicles coexist, changes in the environment due to loading and unloading of the transport vehicles themselves (regardless of whether they are unmanned or manned) are not reflected in the environment map used by the unmanned transport vehicles. When a car moves to its destination, there is a situation where there is a load at an unexpected position, a situation where there is no target load, and such an unexpected change in the environment. There was a possibility that a decrease in accuracy would occur.

  In addition, when the inventory management system instructs the loading and unloading to the automatic guided vehicle, it instructs the address (center coordinates) and the packing form (width, depth, height) to load and unload the load. The load is not always in the correct position. For this reason, the automatic guided vehicle may recognize the inconsistency of the map information for the first time at the destination, and it may take time for the update to perform the process of creating the map thereafter, or an abnormal stop may occur.

  In addition, the purpose of updating the maps in Patent Document 1 and Patent Document 2 is considered to be a response to an unpredictable environmental change, and does not assume a situation where the environment changes constantly and clearly due to cargo handling. For this reason, the change of the map is basically based on observation (measurement) with a sensor mounted on the robot, and it is not assumed that the map is changed (updated) before going to the observation point.

  The present invention has been made in view of the above problems, and its purpose is to update an environmental map used by the automated guided vehicle in real time based on the entry / exit information of the inventory management system, and the environment. An object of the present invention is to provide a map information update method in an interlock system of an automated guided vehicle and an inventory management system that can increase the accuracy of a map.

  The map information update method in the linkage system of the automated guided vehicle and the inventory management system that solves the above-described problem includes at least a database for storing data related to the inventory status of the warehouse, management of the data related to the inventory status, and the load of the load to the warehouse An inventory management system having an inventory management computer for instructing a delivery vehicle to and from the delivery vehicle; and as the delivery vehicle, at least one unmanned delivery vehicle that moves using an environmental map and receives and loads the load; In a linked system of an automated guided vehicle and an inventory management system that includes a map management unit that updates the map information of the environmental map based on inventory update information, the automated guided vehicle was placed by itself when entering the warehouse with the automated guided vehicle. The shape and position of the load are measured and registered as a partial map of the environmental map. Here, the “environment map” means, for example, coordinate data capable of grasping a distance from a laser scanner mounted on an automatic guided vehicle to a peripheral arrangement obtained by measurement in a horizontal plane having a certain height.

  According to this configuration, the map information of the environmental map used by the automatic guided vehicle is updated based on the inventory update information. Therefore, when the entry / exit information of the inventory management system is changed, the environmental map is updated in real time. Therefore, the environment map used by the automated guided vehicle can be updated in real time based on the entry / exit information of the inventory management system. Therefore, when an automated guided vehicle receives an entry / exit instruction, it takes less time to update the environmental map at the destination by checking the latest environmental map information before moving to the warehouse. . Also, since the shape and position of the load received by the automated guided vehicle is measured by the automated guided vehicle that received the load and registered as a partial map of the environmental map, the accuracy of the partial map should be increased. Can do.

  A non-measurement transport vehicle that does not have a function of measuring the shape and placement position of the load as the transport vehicle, and when the non-measurement transport vehicle performs a warehousing operation, the stock management system indicates the shape and placement position of the load. It is preferable that a vehicle having a function of measuring the shape and placement position of the load is measured according to the instruction and registered as the partial map. According to this configuration, for example, when a warehousing operation is performed by a manned transport vehicle, the shape and placement position of the load are measured by, for example, an automatic guided vehicle according to an instruction from the inventory management system and registered as a partial map. Therefore, even if there are automatic guided vehicles and automatic guided vehicles, the automatic guided vehicles perform the loading and unloading work using an accurate environmental map regardless of whether the load is received by the automatic guided vehicles or the automatic guided vehicles. It becomes possible.

  According to the present invention, the environmental map used by the automated guided vehicle can be updated in real time based on the entry / exit information of the inventory management system, and the accuracy of the environmental map can be increased.

The schematic block diagram of the interlocking system of the automatic guided vehicle and inventory control system of one Embodiment. (A) is a schematic diagram of an environmental map, (b) is a schematic diagram of a basic map, (c) is a schematic diagram of a partial map. The flowchart which shows operation | movement of WMS. The flowchart which shows operation | movement of an automatic guided vehicle and a manned transport vehicle. The flowchart which shows operation | movement of a map server. (A)-(d) is a schematic diagram explaining the partial map preparation method. (A)-(d) is a schematic diagram explaining environmental map update.

Hereinafter, an embodiment in which the present invention is embodied in a system for a flat warehouse will be described with reference to FIGS.
As shown in FIG. 1, an interlocking system of an automated guided vehicle and an inventory management system (hereinafter sometimes simply referred to as an interlocking system) includes a WMS (inventory management system) 10 and an automated guided vehicle 20 as a transporting vehicle. The map management unit 31 and the manned transport vehicle 40 as a transport vehicle are provided.

  The WMS 10 includes an inventory management computer 11 and a memory 12. The inventory management computer 11 includes a CPU (not shown), and manages at least a database for storing data relating to the inventory status of the warehouse 50 (shown in FIG. 6A), management of data relating to the inventory status, the automatic guided vehicle 20 and the manned vehicle. An instruction for loading and unloading the load W with respect to the transport vehicle 40 is performed. The memory 12 stores inventory data 13 and packing form data 14.

  The inventory data 13 is composed of data indicating the product number, address and center coordinates of the load W. The center coordinates are represented by three-dimensional coordinates such as an X coordinate, a Y coordinate, and a Z coordinate. When the load W is placed in one stage, the Z coordinate indicating the height direction is omitted or expressed as a two-dimensional coordinate with zero (0) being constant. The package appearance data 14 is composed of data indicating the product number, width (W), depth (L), and height (H) of the load W.

  The WMS 10 and the automated guided vehicle 20 and the manned guided vehicle 40 can communicate wirelessly. The WMS 10 wirelessly gives an entry / exit instruction to the automatic guided vehicle 20 and the manned transport vehicle 40, and receives an entry / exit operation completion report from the automatic guided vehicle 20 and the manned transport vehicle 40 by wireless.

  The automatic guided vehicle 20 includes driving wheels and driven wheels (not shown), and moves by driving the driving wheels with a motor. The automatic guided vehicle 20 includes a CPU 21, an operation management unit 22, a self-position estimation unit 23, an environment map 24, a motion observation sensor 25, and an environment recognition laser sensor 26. As the laser sensor 26, for example, a laser range finder is used. The operation management unit 22 and the self-position estimation unit 23 are composed of a CPU 21 and a control program.

  The operation management unit 22 drives the driving wheels and the steering of the automatic guided vehicle 20 so that the automatic guided vehicle 20 moves from the standby position to the standby position after the automatic guided vehicle 20 moves from the standby position to the standby position based on the entry / exit instruction from the WMS 10. To control.

  Observation data of the motion observation sensor 25 is stored in the memory as odometry data 27. The measurement data of the laser sensor 26 is stored in the memory as laser scan data 28. The self-position estimation unit 23 estimates the self-position using the environment map 24 and the laser scan data 28. The operation management unit 22 controls the movement of the automatic guided vehicle 20 based on the environmental map 24 and the self-position estimation result of the self-position estimation unit 23. That is, the automatic guided vehicle 20 travels autonomously using the environment map 24.

  As shown in FIG. 2A, the environment map 24 includes a basic map 24a and a partial map 24b. As shown in FIG. 2 (b), the basic map 24 a shows the position and shape of an invariant location in the warehouse 50. In the warehouse 50 in this embodiment, as shown in FIG. 6A, a wall 52 exists so as to surround a rectangular load storage space 51, and an entrance / exit 53 exists in the center of the wall 52.

  Each partial map 24b shows the shape of one load W and the placement position of the load W in the warehouse 50, as shown in FIG. Accordingly, the environment map 24 is composed of one basic map 24 a and the same number of partial maps 24 b as the number of loads W accommodated in the warehouse 50. FIG. 2A shows a state in which the load W is fully loaded in the warehouse 50. The basic map 24a uses an occupied grid map which is a map in which the value of a grid cell in which an object is present is 1 and the value of a non-existing cell is 0.

  The partial map 24b is obtained by projecting the outer shape of the load W transported and placed in the warehouse 50 by the automatic guided vehicle 20 or the manned transport vehicle 40 onto the above-described occupied grid map, and has the same coordinate system as the basic map 24a. In, each load W is registered and managed independently. For example, when there are 50 loads W in the warehouse 50, 50 partial map data exist on the memory. Although the partial map 24b can be held in the form of an occupation grid map, in this embodiment, it is expressed by a two-dimensional point group (for example, double x, y, etc.). That is, the outline of the load W is approximated and held by a set of points.

  The basic algorithm for self-position estimation by the self-position estimation unit 23 is premised on a comparison between a two-dimensional map and a laser scan. In this embodiment, the literature (S. Thrun, W. Burgard, D. Fox, “Stochastic Robotics”, Mainichi Communications, 2007. (Japanese version out of print) / Probabilistics Robotics (Intelligent Robotics and Autonomous Agents series), The MIT Press ) Or the like, a method called Monte Carlo localization (Monte Carlo localization, MCL) is used.

  The map management unit 31 constitutes a map server 30 provided separately from the WMS 10 and the automatic guided vehicle 20, and the map server 30 includes a map database 32. The map server 30 can communicate with the WMS 10 and the automatic guided vehicle 20 by radio. The map server 30 records the position and shape in the work space coordinate system of each load W in a state where it is placed in the warehouse 50. The map server 30 receives data indicating the position of the load W from the automatic guided vehicle 20 when the automatic guided vehicle 20 performs the warehousing operation and the loading of the load W is completed. The map database 32 is updated by updating the partial map 24b.

  When WMS 10 receives a warehouse completion report from manned transport vehicle 40, WMS 10 measures the shape and placement position of load W and transmits a measurement instruction to automatic guided vehicle 20 to create partial map 24b. . When the automated guided vehicle 20 receives the measurement instruction from the WMS 10, the automatic guided vehicle 20 creates a partial map 24 b for the load W at the designated address and center coordinates, and transmits data of the partial map 24 b to the map server 30. When the map server 30 receives the data of the partial map 24b from the automated guided vehicle 20, the map management unit 31 updates the partial map 24b of the environmental map 24 and updates the map database 32. That is, when a manned transport vehicle 40 as a non-measuring transport vehicle that does not have a function of measuring the shape and placement position of the load W performs a warehousing operation, the shape and placement position of the load W are instructed by the instruction of the WMS 10. The automatic guided vehicle 20 as a vehicle having a function of measuring the shape and the position is measured, and the map management unit 31 is registered as the partial map 24b.

Next, the operation of the interlocking system configured as described above will be described.
As shown in FIG. 3, the WMS 10 instructs the automatic guided vehicle 20 or the manned transport vehicle 40 to enter / exit the load W at step S1, and waits for the result of the storage at step S2. The WMS 10 determines whether or not there is an entry / exit completion report in step S3, and upon receiving the completion report, outputs the entry / exit result to the map server 30 in step S4. That is, the WMS 10 wirelessly communicates the product number and address of the received load W if it is received, and the product number and address of the load W that has been delivered if it is delivered. Next, the WMS 10 updates the inventory data 13 based on the entry / exit completion report in step S5, and a series of operations accompanying one entry / exit instruction is completed.

  As shown in FIG. 4, the automated guided vehicle 20 waits for a loading / unloading instruction from the WMS 10 in step S <b> 11, and determines whether there is a loading / unloading instruction in step S <b> 12. If it is determined in step S12 that there is an entry / exit instruction, the automatic guided vehicle 20 proceeds to step S13 and determines whether it is an entry instruction. If it is a warehousing instruction, the process proceeds to step S14, moves to the receiving position and receives the goods, and then moves to the warehouse 50. Next, in step S15, the automatic guided vehicle 20 performs a warehousing operation in the warehouse 50, and issues a completion report when the warehousing operation is completed. The completion report includes, in addition to the warehousing work completion report for the WMS 10, the work of transmitting the position information of the loaded goods W, that is, the data of the partial map 24 b, to the map server 30. Next, the automatic guided vehicle 20 proceeds to step S16, moves to the standby position, and a series of operations is completed.

  If the automatic guided vehicle 20 determines in step S <b> 13 that the instruction is not a warehousing instruction, the automatic guided vehicle 20 proceeds to step S <b> 17, moves to the warehouse 50, and performs a delivery operation in the warehouse 50. The automated guided vehicle 20 issues a completion report when the leaving operation is completed in step S18. The completion report includes, in addition to the delivery work completion report for the WMS 10, the work for transmitting the location information of the delivered goods W before delivery to the map server 30. In this case, the position information before the shipment of the delivered cargo W is an address in the warehouse 50.

  The manned transport vehicle 40 operates similarly to the automatic guided vehicle 20 in accordance with the flowchart shown in FIG. However, unlike the automated guided vehicle 20, the manned transport vehicle 40 communicates with the WMS 10 only by radio (on-vehicle terminal or handy terminal). That is, since the manned transport vehicle 40 is visually moved by the operator, the laser sensor 26 is not provided, and unlike the case of the unmanned transport vehicle 20, the position information of the received load W is not created, so the warehousing operation is completed. Thereafter, the location information of the loaded goods W is not transmitted to the map server 30.

  As shown in FIG. 5, the map server 30 waits for information from the WMS 10 and the automated guided vehicle 20 in step S21, and determines whether there is entry / exit information in step S22. The information from the WMS 10 includes warehousing completion information and warehousing completion information. The warehousing completion information includes data indicating the product number, address, and center coordinates of the loaded goods W. The delivery completion information includes data indicating the product number of the delivered cargo W, the address before delivery, and the center coordinates. Further, the information from the automated guided vehicle 20 includes the position information of the loaded goods W, that is, the data of the partial map 24b.

  If the map server 30 determines that there is storage information at step S22, the map server 30 proceeds to step S23, and determines whether the storage information is present. If it is warehousing information, the process proceeds to step S24. If the warehousing information is both the warehousing completion information from the WMS 10 and the partial map information from the automatic guided vehicle 20, the partial map 24b is updated based on the partial map information. Create and register (update). In addition, when the warehousing information is only the warehousing completion information from the WMS 10 and there is no partial map information from the automatic guided vehicle 20, there is no accurate position information of the load W because of the warehousing by the manned carrier vehicle 40. In that case, the map server 30 creates and registers (updates) the partial map 24b based on the warehousing completion information from the WMS 10. The map server 30 creates the partial map 24b on the assumption that the load W exists at the address and the center coordinates instructed to enter. The partial map 24b is in a state in which it can be distinguished from other partial maps 24b when the automated guided vehicle 20 receives the data of the environmental map 24 from the map server 30.

  Next, the map server 30 performs new map composition and output in step S25. In the new map composition, the new partial map 24b data is added to the previous environmental map 24 data, and then the new environmental map 24 is composed (updated) with the basic map 24a data and all the partial map 24b data. ). When the new environment map 24 is completed, the map server 30 wirelessly transmits the data of the new environment map 24 to the automatic guided vehicle 20. If the map server 30 determines that it is not warehousing information in step S23, the map server 30 proceeds to step S26, and the partial map 24b of the load W existing at the address and center coordinates of the cargo W delivered based on the delivery completion information from the WMS 10. Is deleted. Next, the map server 30 proceeds to step S25, and performs new map composition and output.

  Therefore, the automatic guided vehicle 20 can immediately obtain the latest environmental map 24 when the state of the load W in the warehouse 50 changes, and can perform the loading / unloading work using the latest environmental map 24. For this reason, the automatic guided vehicle 20 has high accuracy in self-position estimation when performing the loading / unloading work in the warehouse 50.

  In addition, when WMS 10 receives a warehouse completion report from manned transport vehicle 40, WMS 10 transmits a measurement instruction to unmanned transport vehicle 20 to measure the shape and placement position of load W and create partial map 24 b. . When the automated guided vehicle 20 receives the measurement instruction from the WMS 10, the automatic guided vehicle 20 creates a partial map 24 b for the load W at the designated address and center coordinates, and transmits data of the partial map 24 b to the map server 30. When the map server 30 receives the data of the partial map 24b from the automated guided vehicle 20, the map management unit 31 updates the partial map 24b of the environmental map 24 and updates the map database 32. As a result, the partial map 24b of the inaccurate load W in the position data received by the manned transport vehicle 40 is updated to the partial map 24b made of accurate data.

Next, a method for creating the partial map 24b by the automatic guided vehicle 20 will be described. In order to simplify the explanation, the case where the goods are received in the warehouse 50 without the load W will be described as an example.
The partial map 24b is created by causing the automatic guided vehicle 20 to travel by a so-called SLAM method (Simultaneous Localization and Mapping). FIG. 6A shows a state in which the automatic guided vehicle 20 moves backward after placing the load W in the warehouse 50. As shown in FIG. 6A, the automated guided vehicle 20 measures the periphery of the load W with a laser and creates a map around the load W, which is the basis of the partial map 24b. FIG. 6B shows a state in which the automatic guided vehicle 20 has moved back to the outside of the warehouse 50 and changed its direction. In this state, a new map having the position of the wall of the warehouse 50 serving as the basic map 24a and the position of the load W has been created.

  Next, both the conventional map and the new map in Fig. 6 (b) are converted from the occupancy grid map into a two-dimensional point cloud, and matching processing is performed using a technique called ICP (Iterative Closest Point), As shown in FIG. 6C, data representing the position of the load W remains. Next, when data other than the target unloading area is removed, a partial map 24b is obtained as shown in FIG. 6 (d).

  Next, a measurement instruction from the WMS 10 is received with respect to the load W received by the manned transport vehicle 40 and not registered in the environmental map 24 as an accurate partial map 24b, not the load W received by the automatic guided vehicle 20 itself. A case where an accurate partial map 24b is created will be described. In this case, the automated guided vehicle 20 uses an environmental map having a partial map 24b in which the position of the load W is inaccurate as a conventional map. Then, a new map having a position of the wall of the warehouse 50 to be the basic map 24a and a position of the load W is created in the same manner as described above by retreating from the position facing the load W in the warehouse 50. Next, both the conventional map and the new map are converted from the occupied grid map into a two-dimensional point cloud, the difference between the new map and the conventional map is obtained, and data other than the range of the load W is removed to obtain the partial map 24b. The data of the partial map 24b is created and transmitted to the map server 30.

Next, the creation (update) of an environmental map from a state where there is no load W in the warehouse 50 by the map server 30 will be described.
In a state where there is no load W in the warehouse 50, as shown in FIG. 7A, the environment map 24 is composed only of the basic map 24a. Next, when the load W is received into the warehouse 50 by the automatic guided vehicle 20 and the map server 30 receives the position information of the load W, that is, the data of the partial map 24b, from the automatic guided vehicle 20, the map server 30 reads the partial map. 24b is created and registered, and the basic map 24a and the partial map 24b are combined. As a result, as shown in FIG. 7B, a partial map 24b of one load W is added to the environment map 24 in addition to the basic map 24a.

  Thereafter, the partial map 24b is created and updated in the same manner as the warehousing operation is performed by the automated guided vehicle 20 and the manned guided vehicle 40. As shown in FIG. A partial map 24b corresponding to the number of loads W corresponding to is added. In addition, the partial map 24b by which the warehousing work was performed by the manned carrier vehicle 40 among the partial maps 24b can be distinguished from the other partial maps 24b.

  When the unloading work is performed by the automated guided vehicle 20 or the manned guided vehicle 40 from the state shown in FIG. 7C and the unloading completion information is received from the WMS 10, the map server 30 stores the data of the partial map 24b of the loaded load W. Is deleted from the map database 32, and the environment map 24 is updated. As a result, as shown in FIG. 7D, the environment map 24 is in a state where one partial map 24b is deleted from the state shown in FIG. 7C.

According to this embodiment, the following effects can be obtained.
(1) The linkage system between the automatic guided vehicle and the inventory management system is a database for storing at least data relating to the inventory status of the warehouse 50, management of data relating to the inventory status, and loading / unloading of the load W to / from the warehouse 50 to the conveyance vehicle. A WMS (stock management system) 10 including a stock management computer 11 for instructing is provided. Further, as a transport vehicle, the map management for updating the map information of the environmental map 24 based on the inventory update information of the warehouse 50 and at least one unmanned transport vehicle 20 that moves using the environmental map 24 to load and unload the load W. Part 31.

  According to this configuration, the map information of the environmental map 24 used by the automated guided vehicle 20 is updated based on the inventory update information. Therefore, when the entry / exit information of the WMS 10 is changed, the environment map 24 is updated in real time. Therefore, the environment map 24 used by the automated guided vehicle 20 can be updated in real time based on the entry / exit information of the WMS 10. Therefore, when the automated guided vehicle 20 receives an entry / exit instruction, it takes time to update the environmental map 24 at the destination by checking the map information of the latest environmental map 24 before moving to the warehouse 50. Is suppressed.

  (2) The map information update method in the linkage system of the automated guided vehicle and the inventory management system is such that the automated guided vehicle 20 is placed by itself when the automated guided vehicle 20 enters the warehouse in the linked system of the automated guided vehicle and the inventory management system. The shape and position of the load W are measured and registered as a partial map 24 b of the environmental map 24. According to this configuration, the shape and position of the load W received by the automatic guided vehicle 20 are measured by the automatic guided vehicle 20 that has received the load W and registered as a partial map 24 b of the environmental map 24. Therefore, the accuracy of the partial map 24b is increased.

  (3) The manned transport vehicle 40 is provided as the transport vehicle, and the map management unit 31 updates the map information based on the result of the cargo handling work of the manned transport vehicle 40 grasped by the WMS 10. According to this configuration, when the state of the load W in the warehouse 50 changes due to the loading / unloading work by the manned transport vehicle 40, the map information of the environmental map 24 is updated. However, unlike the automated guided vehicle 20, the manned transport vehicle 40 moves by the operator's visual inspection without using the environmental map 24, so that there is no accurate position information of the load W at the time of storage. The position of the load W is an address (center coordinate). However, unlike the prior art, the automated guided vehicle 20 can grasp the change of the environmental map 24 due to the loading / unloading operation by the manned guided vehicle 40, and to the warehouse 50 in a situation where there is no target load W at the time of the loading operation. The target load W cannot be picked up due to the movement or the load W at an unexpected position, and the vehicle does not stop abnormally.

  (4) When a non-measurement transport vehicle (manned transport vehicle 40) that does not have a function of measuring the shape and placement position of the load W as a transport vehicle performs a warehousing operation, the WMS 10 indicates the shape and placement position of the load W. Thus, a vehicle (automatic guided vehicle 20) having a function of measuring the shape and placement position of the load measures and registers it as a partial map 24b. According to this configuration, even when the automated guided vehicle 20 and the automated guided vehicle 40 exist, the automated guided vehicle 20 is accurate regardless of whether the load W is received by the automated guided vehicle 20 or the automated guided vehicle 40. It is possible to carry out loading / unloading work using the environmental map 24.

  (5) The partial map 24b related to the load W received by the manned transport vehicle 40 is different from the partial map 24b until the position of the load W is measured by the automatic guided vehicle 20 and the partial map 24b is updated. It is in a state where it can be distinguished from the partial map 24b. According to this configuration, when the automatic guided vehicle 20 creates the partial map 24b of the load W received by the manned transport vehicle 40, the measurement work is performed in a state where it is recognized that the partial map 24b of the load W is not accurate. It can be performed. Moreover, even if the automated guided vehicle 20 may leave the load W before the accurate partial map 24b of the load W received by the manned transport vehicle 40 is created, the partial map 24b of the load W is not displayed. Unloading work can be performed in a state where it is recognized that it is not accurate.

  (6) The environment map 24 includes a basic map 24a and a partial map 24b. The basic map 24a shows the position and shape of an invariable location in the warehouse 50. The partial map 24b shows the shape of the load W and the warehouse 50 of the load W. The placement position at. According to this configuration, the data of the basic map 24 a is unchanged unless the warehouse 50 is modified, and it is avoided that the basic map 24 a includes noise when the environmental map 24 is updated. In addition, since the partial map 24b is configured by data indicating the shape and placement position of the load W, there is a possibility that noise unrelated to the load W when the automatic guided vehicle 20 measures the surroundings is included in the map information. Lower.

  (7) The map management unit 31 updates the map information by updating the partial map 24b. According to this configuration, of the information (data) of the basic map 24a and the partial map 24b constituting the environment map 24, the data of the basic map 24a that is unchanged unless the warehouse 50 is modified is updated without updating the data of the basic map 24b. Since only data updating is performed, updating becomes easy.

  (8) When the cargo W is delivered from the warehouse 50, the map management unit 31 deletes the partial map 24b of the cargo W delivered from the map information based on the information of the WMS 10. According to this configuration, the partial map 24b can be deleted based on the information (shipping completion information) from the WMS 10 that the load W has been lost, and thus the map can be instantly changed to the latest status.

  (9) The environment map 24 includes at least one basic map 24a and a partial map 24b corresponding to each load W, and the range of each partial map 24b is predetermined. Therefore, when the automated guided vehicle 20 creates the partial map 24b, the matching process is performed by the ICP method, the difference between the new map and the conventional map is obtained, and then data other than the target unloading area is removed. , It is unlikely that noise will be included in the map when observing parts unrelated to loading.

  (10) When the map management unit 31 updates the map information of the partial map 24b based on the information of the WMS 10, the map management unit 31 updates the map information in a predetermined range of each partial map 24b. Therefore, there is no possibility that the information of the partial map 24b is updated so as to exist across a plurality of ranges. Further, when the partial map 24b is updated by deleting the map information, the update can be easily performed in a short time by deleting the map information in the range of the corresponding partial map 24b.

The embodiment is not limited to the above, and may be embodied as follows, for example.
When the WMS 10 instructs the automatic guided vehicle 20 to measure the load W received by the automatic guided vehicle 40, the automatic guided vehicle 20 is not waiting at the standby position, for example, the warehouse 50 for loading and unloading work. Or may be in the middle of moving to the standby position after completion of loading and unloading.

  In the above embodiment, the case where there is one unmanned transport vehicle 20 and one manned transport vehicle 40 has been described as an example in order to simplify the description. However, the interlocking system includes a plurality of unmanned transport vehicles 20, and A plurality of units 40 are also provided as necessary. In that case, the map server 30 updates the environmental map 24 by inputting the latest information of the partial map 24b when each automatic guided vehicle 20 completes the warehousing operation from the plurality of automatic guided vehicles 20, and the updated environmental map 24 data is obtained. It transmits to each automatic guided vehicle 20. Therefore, the plurality of automatic guided vehicles 20 can smoothly perform self-position estimation at the time of entering / exiting work based on the latest environmental map 24 without exchanging information with other automatic guided vehicles 20.

  The range corresponding to each predetermined partial map 24b may be a rectangle that represents a place for each load W. In the case of a forklift, since the load W is generally placed and transported on a pallet, the place where the load W is placed is preferably rectangular.

(Circle) It is good also considering the range of each predetermined partial map 24b as each of the four sides of each load which is a rectangle.
○ The map management unit 31 may be equipped in the automated guided vehicle 20. When the number of the automatic guided vehicles 20 is one, even if the map server 30 is not provided, there is no problem by receiving the entry / exit information of the automatic guided vehicles 40 from the WMS 10. If the number of the automated guided vehicles 20 is plural or a small number, the automated guided vehicles 20 exchange the information of the partial map 24b created by each of them at the time of warehousing operation by radio, so that the environmental map 24 of each of the automated guided vehicles 20 is updated. It can be updated to the one corresponding to the environmental condition.

O Only the automatic guided vehicle 20 may be provided without the manned transport vehicle 40 as the transport vehicle.
○ The self-position estimation method may be a method other than the MCL method.
The partial map 24b may be created without using SLAM. The partial map 24b may be created based on the result of laser measurement.

The basic map 24a may be created by laser scanning without using the occupied grid map for the basic map 24a.
○ The transport vehicle (the automatic guided vehicle 20 and the manned transport vehicle 40) is not limited to a forklift that transports the load W using a pallet, but directly holds a cylindrical (cylindrical) load W like a roll paper or a drum can. The structure provided with the roll clamp may be sufficient.

  In the case of using a pallet, a rectangular shape is preferable as a place for the load W. However, even when the load W is a columnar shape such as a roll paper or a drum, there is no problem even if the place for the load W is a rectangle (square).

  ○ When transporting the load W using a pallet, the load W is not stacked and placed. For example, when the load W is roll paper, a partially used roll paper and an unused roll paper partially used May be stored in the warehouse 50 in a state of being mixed. In that case, the roll paper in use may be placed on the unused roll paper in a state of being stacked.

  The environment map 24 only needs to be composed of at least one basic map 24a and partial maps 24b corresponding to individual loads W, and a plurality of basic maps 24a may exist. For example, when the warehouse 50 periodically changes a specific part, the basic map 24a is composed of a plurality of basic maps 24a related to a part that may be changed and a basic map 24a related to an unchangeable part. May be.

  W ... load, 10 ... WMS (inventory management system), 11 ... inventory management computer, 20 ... automatic guided vehicle as a transport vehicle, 24 ... environmental map, 24b ... partial map, 31 ... map management unit, 40 ... non-measurement transport A manned carrier as a car, 50 ... a warehouse.

Claims (2)

A database for storing at least data relating to the inventory status of the warehouse, an inventory management system comprising an inventory management computer for managing data relating to the inventory status and instructing a transport vehicle to load and unload the warehouse;
As the transport vehicle, at least one automatic transport vehicle that moves using an environmental map and loads and unloads the load; and
In the link system of the automatic guided vehicle and the inventory management system, comprising a map management unit that updates the map information of the environmental map based on the inventory update information of the warehouse,
The automatic guided vehicle and the inventory management system characterized by measuring the shape and position of the load placed by the automatic guided vehicle when it is received by the automatic guided vehicle and registering it as a partial map of the environmental map. Map information update method in the linked system.   A non-measurement transport vehicle that does not have a function of measuring the shape and placement position of the load as the transport vehicle, and when the non-measurement transport vehicle performs a warehousing operation, the stock management system indicates the shape and placement position of the load. The map information update method in the linkage system of the automatic guided vehicle and the inventory management system according to claim 1, wherein the vehicle having a function of measuring the shape and placement position of the load is measured and registered as the partial map.