Self-organizing materials handling systems

• US 6,078,847 A
• Filed: 11/24/1997
• Issued: 06/20/2000
• Est. Priority Date: 11/24/1997
• Status: Expired due to Fees

• Current Assignee: Agilent Technologies, Inc.
• Original Assignee: Hewlett-Packard Company (HP Inc.)
• Inventors: Eidson, John C., Sitte, Hans
• Primary Examiner(s): Ellis, Christopher P.
• Assistant Examiner(s): Tran, Khoi H.
• Application Number:
  US08/976,733
• Time in Patent Office: 939 Days
• Field of Search: 364/478.16, 364/478.17, 364/478.18, 364/478.14, 198/575, 198/576, 198/571, 198/341.07, 198/349.6, 198/349.7, 198/349.9
• US Class Current: 700/229
• CPC Class Codes: G05B 19/4183 characterised by data acquisition, e.g. workpiece identification
• CPC Class Codes: G05B 19/4189 characterised by the transport system
• CPC Class Codes: Y02P 90/02 Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

A materials handling system which is made up of self-organizing components that provide distributed materials handling control without intervention or control by a centralized controller.

Claims

1. A materials handling system, comprising a set of components which are arranged so that each of a set of item input paths of each particular component connects to an item output path of a nearest neighbor one of the components which is located upstream in the materials handling system and each of a set of item output paths of each particular component connects to an item input path of a nearest neighbor one of the components which is located downstream in the materials handling system, each component having means for establishing a nearest neighbor communication oath to each corresponding nearest neighbor component and means for determining the corresponding item output path to be used to route an item toward a unique one of the components in response to a notification message received from the unique one of the components via the nearest neighbor communication paths.

2. The materials handling system of claim 1, wherein each component further comprises means for obtaining a unique identifier for each corresponding nearest neighbor component via the nearest neighbor communication paths.

3. The materials handling system of claim 2, wherein each component further comprises means for transferring a message via a global communication path to the components in the materials handling system wherein the message includes a unique identifier for the component that transfers the message and the unique identifiers of the corresponding nearest neighbor components.

4. The materials handling system of claim 3, wherein the messages from the components enables construction of a topological map of the materials handling system.

5. The materials handling system of claim 4, wherein information contained in the messages from the components enables a determination of whether a failure has occurred in any of the components.

6. The materials handling system of claim 1 wherein the notification message includes a set of congestion information pertaining to the unique one of the component.

7. The materials handling system of claim 1, wherein one or more of the components further comprises means for receiving the notification message from one or more of the components which are located upstream in the materials handling system such that the notification message includes information that enables the component to render a routing decision for an item being transported through the materials handling system.

8. The materials handling system of claim 1, wherein one or more of the components further comprises means for determining an appropriate one of the corresponding nearest neighbor components which are located downstream in the materials handling system to move an item received from one of the corresponding nearest neighbor components which is located upstream in the materials handling system.

9. A materials handling system, comprising a set of components which are arranged so that each of a set of item input paths of each particular component connects to an item output path of a nearest neighbor one of the components which is located upstream in the materials handling system and each of a set of item output paths of each particular component connects to an item input path of a nearest neighbor one of the components which is located downstream in the materials handling system, each component having a configuration node and means for establishing a set of nearest neighbor communication paths to the corresponding nearest neighbor components wherein the configuration node determines the corresponding item output path to be used to route an item toward a unique one of the components in response to a notification message received from the unique one of the components via the nearest neighbor communication paths.

10. The materials handling system of claim 9, wherein the nearest neighbor communication paths for one of the components comprise a physical communication link to each corresponding nearest neighbor component.

11. The materials handling system of claim 9, further comprising a global communication path that enables communication among all the components such that each configuration node transfers a message via the global communication path that includes a unique identifier for the component that corresponds to the configuration node that transfers the message and a set of unique identifiers of the corresponding nearest neighbor components.

12. The materials handling system of claim 11 wherein for one or more of the components the nearest neighbor communication paths and the global communication path are separate physical communication links.

13. The materials handling system of claim 12, wherein one or more of the components further comprise a set of gateways that transfer communication packets among the nearest neighbor communication paths and the global communication path and a local communication path which is used for communication within the component.

14. The materials handling system of claim 11, further comprising a computer system coupled to the global communication path such that the computer system obtains the messages from the components via the global communication path and constructs a topological map of the materials handling system.

15. The materials handling system of claim 9, wherein the notification message includes a set of congestion information pertaining to the unique one of the components.

16. The materials handling system of claim 9, wherein the configuration node in one or more of the components receives a notification message from one or more of the components which are located upstream in the materials handling system such that the notification message includes information that enables the configuration node to render a routing decision for an item being transported through the materials handling system.

17. The materials handling system of claim 9, wherein the configuration node in one or more of the components determines an appropriate one of the nearest neighbor components which are located downstream to move an item received from one of the neighbor components which is located upstream in the materials handling system.