Automatic battery recharging station for AGVs

• US 6,498,454 B1
• Filed: 05/24/2001
• Issued: 12/24/2002
• Est. Priority Date: 05/24/2001
• Status: Expired due to Fees

• Current Assignee: Advanced Micro Devices SDN Berhad (Advanced Micro Devices, Inc.)
• Original Assignee: Advanced Micro Devices SDN Berhad (Advanced Micro Devices, Inc.)
• Inventors: Pinlam, Watcharin, Bupparit, Youthachai, Moogdaharn, Chalor
• Primary Examiner(s): Tso, Edward H.
• Application Number:
  US09/864,727
• Time in Patent Office: 579 Days
• Field of Search: 320/103, 320/104, 320/109, 414/281-286, 104/84
• US Class Current: 320/107
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles

Abstract

The present invention provides AGV systems with automatic recharging and a central processor for control. The central processor monitors the charge states of the AGVs, assigns them to tasks, and can determines when to recharge the AGVs. The central processor can optimize the operation of the AGVs to achieve various objectives which can include, for example, maximizing AGV availability, maximizing battery life, and/or maximizing recharging station utilization. Systems and methods of the invention can maximize the utilization of AGV equipment and minimize the number of AGVs required to accomplish a given set of tasks.

Claims

1. An automated guided vehicle system, comprising:

a plurality of battery powered guided vehicles

an automatic recharging station for recharging the guided vehicles; and

a central processor;

wherein the central processor receives task requests, monitors a charge status for the guided vehicles, and selects guided vehicles to perform the tasks.

2. The automated guided vehicle system of claim 1, wherein the guided vehicles provide battery data to the central processor via wireless communication.

3. The automated guided vehicle system of claim 1, wherein the automatic recharging station determines battery data for a guided vehicle docked at the automatic recharging station and communicates the battery data to the central processor.

4. The automated guided vehicle system of claim 1, wherein the central processor employs a battery model in monitoring the charge status of the guided vehicles.

5. The automated guided vehicle system of claim 1, wherein the charge status for the guided vehicles includes a quantitative measure of charge in a guided vehicle battery.

6. The automated guided vehicle system of claim 1, wherein the central processor assigns the tasks to the guided vehicles based in part on the charge statuses for the guided vehicles.

7. The automat ed guided vehicle system of claim 6, wherein the central processor assigns the tasks to the guided vehicles based in part on a charge requirement associated with each task.

8. The automated guided vehicle system of claim 7, wherein the central processor determines the charge requirement to associate with each task.

9. The automated guided vehicle system of claim 1, wherein the central processor directs recharging of the guided vehicles at the automatic recharging station.

10. The automated guided vehicle system of claim 9, wherein the central processor assigns tasks to the guided vehicles and directs recharging of the guided vehicles according to a protocol that employs as one criteria preferably discharging guided vehicle batteries to at least a predetermined extent prior to recharging.

11. The automated guided vehicle system of claim 9, wherein the central processor assigns tasks to the guided vehicles and directs recharging of the guided vehicles according to a protocol that employs as one criteria preferably subjecting guided vehicle batteries to only shallow discharges.

12. An automated guided vehicle system, comprising.

a plurality of battery powered guided vehicles;

means for automatically recharging the vehicles;

means for assigning tasks to the vehicles ; and

means for coordinating automatically recharging the vehicles with assigning tasks to the vehicles.

13. A method of operating a plurality of battery powered guided vehicles, comprising:

using a central processor to assign tasks to the vehicles, monitor a charge status for the vehicles, and control recharging of the vehicles.

14. The method of claim 13, further comprising employing wireless communication to communicate battery data to the central processor.

15. The method of claim 13, further comprising determining guided vehicle battery data at an automatic recharging station and communicating the battery data to the central processor.

16. The method of claim 13, further comprising employing a battery model in monitoring the charge status for the vehicles.

17. The method of claim 13, wherein the charge status of the guided vehicles includes a quantitative measure of charge in a guided vehicle battery.

18. The method of claim 13, wherein the central processor assigns the tasks to the guided vehicles based in part on the charge status for the guided vehicles.

19. The method of claim 18, wherein the central processor assigns the tasks to the guided vehicles based in part on a charge requirement associated with each task.

20. The method of claim 19, wherein the central processor determines the charge requirement to associate with each task.

21. The method of claim 13, further comprising using the central processor to directs recharging of the guided vehicles at an automatic recharging station.

22. The method of claim 21, wherein the central processor assigns tasks to the guided vehicles and directs recharging of the guided vehicles according to an algorithm that employs as one criteria preferably discharging guided vehicle batteries to at least a predetermined extent prior to recharging.

23. The method of claim 21, wherein the central processor assigns tasks to the guided vehicles and directs recharging of the guided vehicles according to an algorithm that employs as one criteria subjecting guided vehicle batteries to only shallow discharge.