Self organizing industrial control system using bidding process

• US 6,091,998 A
• Filed: 09/30/1998
• Issued: 07/18/2000
• Est. Priority Date: 09/30/1998
• Status: Expired due to Term

• Current Assignee: Rockwell Technologies, LLC (Teledyne Technologies Incorporated)
• Original Assignee: Rockwell Technologies, LLC (Teledyne Technologies Incorporated)
• Inventors: Maturana, Francisco Paul, Vasko, David Alan, VandenBerg, Stephen John, Herr, Rebecca Jean, Cheng, Jeffrey Kian Chee
• Primary Examiner(s): Grant, William
• Assistant Examiner(s): Rapp, Chad
• Application Number:
  US09/164,204
• Time in Patent Office: 657 Days
• Field of Search: 700/97, 700/100, 700/102, 700/103, 700/105, 700/109
• US Class Current: 700/100
• CPC Class Codes: G05B 19/41865 characterised by job scheduling, process planning, material flow
• CPC Class Codes: G05B 2219/32086 Integrate process planning and job shop scheduling
• CPC Class Codes: G05B 2219/32087 Decentral planning, each plant involved takes part of global
• CPC Class Codes: Y02P 90/02 Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

An industrial control system associates an autonomous control unit with each piece of equipment in an industrial process, the autonomous control units having a model of the equipment'"'"'s operation and data indicating constraints on the equipment'"'"'s operation. A product to be produced is abstracted as a set of machine independent steps and performance of these steps bid upon by the autonomous control units according constraints models and internal goals. Bids having conflicting requirements may generate counterbids until a completed plan for the production of the product is generated.

Claims

1. An industrial control system for controlling an industrial process of interconnected machines operating on a manufactured product, the industrial control comprising:

a communication link receiving a job description of a set of tasks for producing a desired product;

a plurality of autonomous control units, one associated with each machine, each autonomous control unit including;

(a) an interface connecting the autonomous control unit to the communications link to communicate thereon with other autonomous control units;

(b) an electronic memory holding data representing;

(i) machine constraints indicating constraints on the operation of the associated machine resulting from the limitations of the machine;

(ii) inter-machine constraints indicating constraints on the operation of the associated machine resulting from the interaction of the associated machine with other machines;

(iii) goals indicating desired operating points within the operational constraints; and

(iv) a bid protocol program;

(c) an electronic computer communicating with the interface to receive the job description and the electronic memory and executing the bid protocol program to;

(i) in response to the job description and bids by other autonomous control units, transmitting a bid over the communications link describing performance of a task by the associated equipment operating within the machine constraints, inter-machine constraints and according to the goals and in the alternative, a counterbid proposing new inter-machine constraints;

(ii) in response to counterbids received over the communication link from other autonomous control units, transmitting a modified bid over the communications link describing performance of a task by the associated equipment operating within the machine constraints, the inter-machine constraints as modified by the received counterbid and according to the goals, and in the alternative, a counterbid proposing new inter-machine constraints;

whereby the set of tasks for producing the desired product may be automatically allocated among the machines.

2. The industrial control system of claim 1 wherein the inter-machine constraints are parameters of shared inputs and outputs between interconnected machines.

3. The industrial control system of claim 1 wherein the machine constraints include a list of tasks which the associated machine can perform and wherein the autonomous control unit transmits a bid and in the alternative, a counterbid only if at least one task of the job description is on the list of tasks.

4. The industrial control system of claim 1 wherein the electronic memory further includes data representing a model of the operation of the associated machine and wherein the autonomous control system evaluates the modified inter-machine constraints by execution of the model.

5. The industrial control system of claim 4 wherein the model produces predicted machine outputs when provided with machine inputs and wherein the received counterbid provides proposed new outputs representing the modification of the inter-machine constraints iteratively applies machine inputs to the model within the machine constraints to try to obtain the outputs of the modified inter-machine constraints.

6. The industrial control system of claim 1 wherein the inter-machine constraints include limitation of the path of the desired produce between machines.

7. The industrial control system of claim 1 wherein bids are transmitted on the communication link between autonomous control units following a path that the desired product would take between associated machines and wherein counterbids are transmitted on the communications link between autonomous control units counter to a path that the desired produce would take between associated machines.

8. The industrial control system of claim 1 including a product autonomous control unit associated with the desired product, the produce autonomous control unit including:

(a) an interface connecting the product autonomous control unit to the communications link to communicate thereon with other autonomous control units;

(b) an electronic memory holding data representing;

(i) product constraints indicating constraints on the parameters of the desired;

(ii) goals indicating desired operating points within the product constraints; and

(iii) a bid protocol program;

(c) an electronic computer communicating with the interface to receive the job description and the electronic memory and executing the bid protocol program to;

(i) generate a job description;

(ii) select among plans comprised of sets of bids from other autonomous control systems.

9. The industrial control system of claim 1 wherein the goals are maximization of utility function having input values of the operational parameters of the machines.

10. The industrial control system of claim 1 wherein the autonomous control units produce multiple bids associated with different plans.

11. The industrial control system of claim 1 wherein the different plans are associated with different products.

12. The industrial control system of claim 1 wherein the different plans are associated with different paths of the product through the machines.