Systems and methods for autonomous provision replenishment

1. A method of operating a self-driving material-transport vehicle for autonomous provision replenishment, the method comprising:

receiving, from a provision-replenishment station, a provision-replenishment signal, the signal being generated in response to detecting that a number of items at a stocking queue of a manufacturing process does not satisfy a replenishment threshold, the signal having an item identifier associated with an item type to be replenished, a drop-off location and a first time stamp corresponding to a signal generation time;

retrieving, from a memory, a pick-up location associated with the item identifier;

operating the self-driving material-transport vehicle to:

receive a replenishment mission involving at least the pick-up location, and the drop-off location; and

complete the replenishment mission;

generate a confirmation signal following completion of the replenishment mission, the confirmation signal including a second time stamp corresponding to a replenishment completion time;

determining a delivery time interval based on the first and second time stamps;

determining a replenishment time buffer associated with the replenishment threshold;

adjusting the replenishment threshold based on the replenishment time buffer and the delivery time interval to generate an updated replenishment threshold; and

transmitting the updated replenishment threshold to the provision-replenishment station.

2. The method of claim 1 , wherein the provision-replenishment signal is received by the self-driving material-transport vehicle.

3. The method of claim 1 , wherein the provision-replenishment signal is received by a fleet-management system.

4. The method of claim 1 , wherein the replenishment mission further comprises the item identifier, and completing the replenishment mission further comprises operating the self-driving material-transport vehicle to:

determine a pick-up path based on the pick-up location;

move the vehicle along the pick-up path towards the pick-up location;

receive an item associated with the item identifier at the pick-up location;

determine a drop-off path based on the drop-off location;

move the vehicle along the drop-off path towards the drop-off location; and

drop off the item at the drop-off location.

5. The method of claim 1 further comprising, after determining the pick-up path, operating the self-driving material transport vehicle to:

sense, with a sensor on the vehicle, a first obstruction obstructing the pick-up path;

determine, with the processor, an updated pick-up path based on the pick-up location and the first obstruction; and

move the vehicle along the updated pick-up path towards the pick-up location.

6. The method of claim 5 , further comprising, after determining the drop-off path, operating the self-driving material transport vehicle to:

sense, with the sensor on the vehicle, a second obstruction obstructing the drop-off path;

determine, with the processor, an updated drop-off path based on the drop-off location and the second obstruction; and

move the vehicle along the updated drop-off path towards the drop-off location.

7. The method of claim 1 , comprising:

determining a quantity of items of the item type at the stocking queue; and

determining that the quantity of items does not satisfy the replenishment threshold.

8. The method of claim 1 , comprising:

generating the provision-replenishment signal based on the activation of a user-input device at an assembly location associated with the stocking queue, wherein the item identifier is associated with the user-input device, and the drop-off location is associated with the assembly location.

9. The method of claim 1 , further comprising operating the self-driving vehicle to:

sense, with a sensor of the self-driving vehicle, a provision-replenishment notice on a provision-replenishment board and determining the item identifier based on the provision-replenishment notice; and

transmit the item identifier from the vehicle to an enterprise resource planning system.

10. The method of claim 9 , wherein the provision-replenishment notice comprises a Kanban card.

11. The method of claim 10 , wherein determining the item identifier comprises capturing an image of the Kanban card and comparing the image to a known template image.

12. The method of claim 9 , further comprising receiving, with the self-driving material-transport vehicle, the pick-up location from the enterprise resource planning system.

13. The method of claim 1 , wherein determining the replenishment time buffer is further based on a consumption rate of the stocking queue.

14. A method of operating a self-driving material-transport vehicle for autonomous provision replenishment, the method comprising:

determining, by a provision-replenishment station, that a number of items at a stocking queue of a manufacturing process does not satisfy a replenishment threshold;

transmitting, by the provision-replenishment station to a fleet-management system, a provision-replenishment signal, the provision-replenishment signal including a drop-off location and a first time stamp corresponding to a signal generation time;

generating, by the fleet-management system, a replenishment mission based on the provision-replenishment signal having an associated pick-up location and the drop-off location;

transmitting the replenishment mission from the fleet-management system to the self-driving material-transport vehicle;

operating the self-driving material-transport vehicle to:

execute the replenishment mission;

transmit to the fleet-management system, following completion of the replenishment mission, a confirmation signal including a second time stamp corresponding to a replenishment completion time;

in response to receiving the confirmation signal at the fleet-management system, operating the fleet-management system to determine a delivery time interval based on the first and second time stamps;

determining, by the fleet-management system, a replenishment time buffer associated with the replenishment threshold;

adjusting the replenishment threshold based on the replenishment time buffer and the delivery time interval to generate an updated replenishment threshold; and

transmitting the updated replenishment threshold to the provision-replenishment station.

15. The method of claim 14 , wherein the provision-replenishment signal is generated at the provision-replenishment station based on a count of a quantity of items of associated with an item type at the stocking queue.

16. The method of claim 14 , further comprising:

generating, by the fleet-management system, a second replenishment mission based on a second provision-replenishment signal comprising a second pick-up location and a second drop-off location;

transmitting the second replenishment mission from the fleet-management system to the self-driving material-transport vehicle;

operating the self-driving material-transport vehicle to:

execute the second replenishment mission with the vehicle, wherein the provision-replenishment signal is generated in response to a consumption of a first item of a first item type at the stocking queue, and the second provision-replenishment signal is subsequently generated in response to a consumption of a second item of a second item type at a second stocking queue, and wherein the pick-up location and the second pick-up location are not associated with a common path by the fleet-management system prior to the generation of the second mission.

17. The method of claim 16 , wherein the first replenishment mission and the second replenishment mission each comprise respective sets of waypoints for navigation by the self-driving material-transport vehicle.

18. The method of claim 14 , further comprising planning, with the self-driving material-transport vehicle, a pick-up path to the pick-up location.

19. A system for autonomous provision replenishment, comprising:

at least one self-driving material-transport vehicle having a control system;

a provision-replenishment signal device for generating and transmitting a provision-replenishment signal; and

a fleet-management system in communication with the provision-replenishment signal device and the at least one self-driving material-transport vehicle, the fleet-management system having a processor configured to:

receive the provision-replenishment signal from the provision-replenishment signal device in response to determining that a number of items at a stocking queue does not satisfy a replenishment threshold, the signal including a drop-off location and a first time stamp corresponding to a signal generation time;

determine a pick-up location based on the provision-replenishment signal;

generate a replenishment mission involving at least the pick-up location and the drop-off location; and

transmit the replenishment mission to the at least one self-driving material-transport vehicle;

the self-driving material-transport vehicle being configured to:

receive the replenishment mission from the fleet-management system;

execute the replenishment mission; and

following completion of the replenishment mission, transmit, to the fleet-management system, a confirmation signal including a second time stamp corresponding to a replenishment completion time;

the fleet-management system being configured to:

receive the confirmation signal from the self-driving material-transport vehicle;

in response to receiving the confirmation signal, determining a delivery time interval based on the first and second time stamps;

determine a replenishment time buffer associated with the replenishment threshold;

adjust the replenishment threshold based on the replenishment time buffer and the delivery time interval to generate an updated replenishment threshold; and

transmit the updated replenishment threshold to the provision-replenishment station.

20. The system of claim 19 , wherein the self-driving material-transport vehicle is further configured to plan a pick-up path to the pick-up location, plan a drop-off path to the drop-off location based on the replenishment mission, and move along the pick-up path and the drop-off path to execute the replenishment mission.

21. The system of claim 19 , wherein the at least one self-driving material-transport vehicle comprises at least two vehicles, and the fleet-management system is further configured to:

select a selected vehicle from the at least two vehicles; and

transmit the replenishment mission to the selected vehicle.

22. A system of operating a self-driving material-transport vehicle for autonomous provision replenishment, the system comprising:

a provision-replenishment station operable to:

determine that a number of items at a stocking queue of a manufacturing process does not satisfy a replenishment threshold;

transmit to a fleet-management system a provision-replenishment signal, the provision-replenishment signal including a drop-off location and a first time stamp corresponding to a signal generation time;

a fleet-management system operable to:

generate a replenishment mission based on the provision-replenishment signal having an associated pick-up location and the drop-off location;

transmit the replenishment mission to the self-driving material-transport vehicle;

receive, from the self-driving material-transport vehicle following completion of the replenishment mission, a confirmation signal including a second time stamp corresponding to a replenishment completion time;

in response to receiving the confirmation signal, determine a delivery time interval based on the first and second time stamps;

determine a replenishment time buffer associated with the replenishment threshold;

adjust the replenishment threshold based on the replenishment time buffer and the delivery time interval to generate an updated replenishment threshold; and

transmit the updated replenishment threshold to the provision-replenishment station.

23. The system of claim 22 , wherein the provision-replenishment signal is generated at the provision-replenishment station based on a count of a quantity of items of associated with an item type at the stocking queue.

24. The system of claim 22 , wherein the fleet-management system is further operable to:

generate a second replenishment mission based on a second provision-replenishment signal comprising a second pick-up location and a second drop-off location;

transmit the second replenishment mission to the self-driving material-transport vehicle to cause the self-driving material-transport vehicle to execute the second replenishment mission with the vehicle, wherein the provision-replenishment signal is generated in response to a consumption of a first item of a first item type at the stocking queue, and the second provision-replenishment signal is subsequently generated in response to a consumption of a second item of a second item type at a second stocking queue, and wherein the pick-up location and the second pick-up location are not associated with a common path by the fleet-management system prior to the generation of the second mission.

25. A system for autonomous provision replenishment, comprising:

a provision-replenishment signal device operable to generate a provision-replenishment signal in response to determining that a number of items at a stocking queue does not satisfy a replenishment threshold, the signal including a drop-off location and a first time stamp corresponding to a signal generation time; and

a fleet-management system having a processor configured to:

receive the provision-replenishment signal from the provision-replenishment signal device;

determine a pick-up location based on the provision-replenishment signal;

generate a replenishment mission involving at least the pick-up location and the drop-off location; and

transmit the replenishment mission to at least one self-driving material-transport vehicle;

receive a confirmation signal from the at least one self-driving material-transport vehicle following completion of the replenishment mission, the confirmation signal including a second time stamp corresponding to a replenishment completion time;

in response to receiving the confirmation signal, determining a delivery time interval based on the first and second time stamps;

determine a replenishment time buffer associated with the replenishment threshold;

adjust the replenishment threshold based on the replenishment time buffer and the delivery time interval to generate an updated replenishment threshold; and

transmit the updated replenishment threshold to the provision-replenishment signal device.

26. A method of operating a self-driving material-transport vehicle for autonomous provision replenishment, the method comprising:

determining, by a provision-replenishment station, that a number of items at a stocking queue of a manufacturing process does not satisfy a replenishment threshold;

transmitting, by the provision-replenishment station to a fleet-management system, a provision-replenishment signal, the provision-replenishment signal including a drop-off location and a first time stamp corresponding to a signal generation time;

generating, by the fleet-management system, a replenishment mission based on the provision-replenishment signal having an associated pick-up location and the drop-off location;

transmitting the replenishment mission by the fleet-management system to the self-driving material-transport vehicle;

receiving from the self-driving material-transport vehicle, at the fleet-management system, a confirmation signal including a second time stamp corresponding to a replenishment completion time following completion of the replenishment mission;

in response to receiving the confirmation signal, operating the fleet-management system to determine a delivery time interval based on the first and second time stamps;

determining, by the fleet-management system, a replenishment time buffer associated with the replenishment threshold;

adjusting the replenishment threshold based on the replenishment time buffer and the delivery time interval to generate an updated replenishment threshold.