Systems and methods using bridge models to globally optimize a process facility

• US 6,055,483 A
• Filed: 05/05/1997
• Issued: 04/25/2000
• Est. Priority Date: 05/05/1997
• Status: Expired due to Term

• Current Assignee: Honeywell Incorporated (Honeywell International Inc.)
• Original Assignee: Honeywell Incorporated (Honeywell International Inc.)
• Inventors: Lu, Zhuxin J.
• Primary Examiner(s): WACHSMAN, HAL D
• Application Number:
  US08/851,590
• Time in Patent Office: 1,086 Days
• Field of Search: 364/156, 364/148-160, 364/468.01-468.15, 364/132, 364/138, 364/164, 364/165, 364/148.01, 364/528.01, 364/528.1, 364/528.11, 364/528.12 , 364/528.24, 364/528.35, 706/906, 702/31, 702/113-115, 702/187, 702/181-185, 702/85, 702/105, 702/FOR 119, 702/FOR 155, 395/500.27-500.29, 395/500.3, 700/3, 700/9, 700/14, 700/19, 700/20, 700/28-31, 700/47, 700/48, 700/52, 700/306
• US Class Current: 702/31
• CPC Class Codes: G05B 13/048 using a predictor

Abstract

A control system and a method of operating the same are introduced that globally optimize associated processes within a process facility. The control system includes a global controller, a bridge predictor and many local controllers. The global controller monitors characteristics of the associated processes and generates, in response thereto, control data for optimizing the process facility. The bridge predictor modifies at least a portion of the control data in response to relationships among the associated processes. The local controllers monitor the associated processes and operate in accordance with the control data to varying degrees to control the monitored associated processes, thereby cooperating with the global controller to optimize the process facility.

Claims

1. A control system for controlling associated processes within a process facility, comprising:

a global controller that monitors said associated processes and generates, in response thereto, control data for optimizing said process facility;

a bridge predictor using a time-based prediction optimizer that is capable of modifying at least a portion of said control data in response to relationships among said associated processes; and

local controllers that operate in accordance with said control data to varying degrees to control said associated processes, cooperate with said global controller to optimize said process facility and modify said time-based prediction optimizer to correct mis-predictions thereby.

2. The control system as recited in claim 1 wherein said bridge predictor is associated with said global controller.

3. The control system recited in claim 1 wherein said local controllers monitor said associated processes.

4. The control system recited in claim 1 wherein said local controllers monitor characteristics of said associated processes and said modified portion represents a predicted value of said monitored characteristics.

5. The control system recited in claim 4 further comprising a comparison controller that compares said monitored characteristics and said modified portion.

6. The control system recited in claim 1 wherein said global controller generates said control data as a function of an economic optimization parameter.

7. The control system recited in claim 1 wherein said global controller monitors characteristics of said associated processes and said monitored characteristics are communicated between said global controller and said local controllers.

8. The control system recited in claim 7 wherein said monitored characteristics include output data of said associated processes.

9. The control system recited in claim 1 wherein said varying degrees of said local controllers range between compliance and noncompliance with said control data.

10. The control system recited in claim 1 wherein a particular local controller has a degree of compliance.

11. The control system recited in claim 1 wherein said global controller is centralized.

12. The control system recited in claim 1 wherein ones of said local controllers are proximate ones of said associated processes.

13. A method of operating a control system for controlling associated processes within a process facility, comprising the steps of:

globally monitoring said associated processes and generating, in response thereto, control data for optimizing said process facility;

modifying at least a portion of said control data using a time-based prediction optimizer in response to relationships among said associated processes;

locally controlling said associated processes, to varying degrees, in accordance with said control data to optimize said process facility; and

modifying said time-based prediction optimizer to correct mis-predictions thereby.

14. The method of operation recited in claim 13 further comprising the step of locally monitoring said associated processes.

15. The method of operation recited in claim 13 further comprising the step of monitoring characteristics of said associated processes, said modified portion representing a predicted value of said monitored characteristics.

16. The method of operation recited in claim 15 further comprising the step of comparing said monitored characteristics and said modified portion.

17. The method of operation recited in claim 13 wherein said generating step comprises the step of using an economic optimization parameter.

18. The method of operation recited in claim 13 wherein said globally monitoring step comprises the steps of:

monitoring characteristics of said associated processes; and

communicating said monitored characteristics between a global controller and local controllers of said associated processes.

19. The method of operation recited in claim 18 wherein said monitored characteristics include output data of said associated processes.

20. The method of operation recited in claim 13 wherein said varying degrees range between compliance and noncompliance with said control data.

21. The method of operation recited in claim 13 further comprising the step of using a particular local controller to control a particular one of said associated processes, said particular local controller complying with said control data.

22. The method of operation recited in claim 13 wherein said step of globally monitoring is centralized within said control system, and said step of locally controlling is distributed within said control system.

23. A control system for controlling associated processes within a process facility, comprising:

a global controller that monitors characteristics of said associated processes and generates, in response thereto, control data for optimizing said process facility;

a bridge predictor using a time-based prediction optimizer that is capable of modifying at least a portion of said control data in response to relationships among said associated processes; and

local controllers that monitor said associated processes, operate in accordance with said control data to varying degrees to control said monitored associated processes, cooperate with said global controller to optimize said process facility and modify said time-based prediction optimizer to correct mis-predictions thereby.

24. The control system recited in claim 23 wherein said bridge predictor is associated with said global controller.

25. The control system recited in claim 23 wherein said local controllers monitor characteristics of said associated processes and said modified portion represents a predicted value of said monitored characteristics.

26. The control system recited in claim 25 further comprising a comparison controller that compares said monitored characteristics and said modified portion.

27. The control system recited in claim 23 wherein said global controller generates said control data as a function of an economic optimization parameter.

28. The control system recited in claim 23 wherein said monitored characteristics are communicated between said global controller and said local controllers.

29. The control system recited in claim 23 wherein said monitored characteristics include output data of said associated processes.

30. The control system recited in claim 23 wherein said varying degrees of said local controllers range between compliance and noncompliance with said control data.

31. The control system recited in claim 23 wherein a particular local controller has a degree of compliance.

32. The control system recited in claim 23 wherein said local controllers are distributed.

33. The control system recited in claim 23 wherein ones of said local controllers are proximate ones of said associated processes.