Process-related systems and methods

• US 20040243530A1
• Filed: 01/05/2004
• Published: 12/02/2004
• Est. Priority Date: 07/04/2001
• Status: Abandoned Application

• Current Assignee: Attar Software Limited
• Original Assignee: Attar Software Limited
• Inventors: Pressinger, Simon, Al-Attar, Akeel
• Application Number:
  US10/482,160
• Publication Number:
  US 20040243530A1
• Time in Patent Office: Days
• US Class Current: 706/45
• CPC Class Codes: G05B 13/027 using neural networks only

Abstract

The present invention relates to process development systems and related methods, including a process development wsystem comprising: a performance improvement rule generation module for generating a performance improvement rule set for at least one process factor from a generated rule set for the at least one process factor, each rule including a plurality of decision points corresponding to split variables relating to process conditions and a plurality of outcomes, wherein the performance improvement rule generation module is configured, for each rule from the or each generated rule set, to attach an activity flag at each decision point and thereby generate a performance improvement rule, the activity flag having one of two values indicative of whether the respective split variable is alterable or non-alterable by a process operator such as to enable operation of the performance improvement rule in determining which of the outcomes is attainable for given process conditions.

Claims

1. A process development system, comprising:

a performance improvement rule generation module for generating a performance improvement rule set for at least one process factor from a generated rule set for the at least one process factor, each rule of the or each generated rule set including a plurality of decision points corresponding to split variables relating to process conditions and a plurality of outcomes, wherein the performance improvement rule generation module is configured, for each rule from the or each generated rule set, to attach an activity flag at each decision point and thereby generate a performance improvement rule, each activity flag having one of two values indicative of whether the respective split variable is alterable or non-alterable by a process operator or an automated process control system, such as to enable operation of the performance improvement rule in determining which of the outcomes is attainable for given process conditions.

2. The system of claim 1, wherein the or each rule is represented as a decision tree having a plurality of internal nodes and a plurality of terminal nodes, with the decision points being the internal nodes and the outcomes being the terminal nodes.

3. The system of claim 1, further comprising:

a rule generation module for generating the generated rule set for the at least one process factor by applying rule induction techniques to a rule-generation data set including data corresponding to process conditions.

4. The system of claim 3, further comprising:

a data collection module for collecting historic process data and deriving the rule-generation data set from the historic process data.

5. The system of claim 4, wherein the data collection module is configured to derive the rule-generation data set and an extracted data set, unseen by the rule generation module, from the historic process data.

6. The system of claim 3, further comprising:

a rule verification module for verifying the generated rule set for the at least one process factor.

7. The system of claim 6, further comprising:

a data collection module for collecting historic process data and deriving the rule-generation data set and an extracted data set, unseen by the rule generation module, from the historic process data; and

wherein the rule verification module comprises a rule test sub-module which utilizes the extracted data set to satisfy that each rule is satisfied by the extracted data set.

8. The system of claim 6, wherein the rule verification module comprises a rule modification sub-module for enabling the rule generation module to be re-invoked to generate a modified generated rule set for the at least one process factor.

9. The system of claim 1, further comprising:

a rule condition attachment module for attaching to any rule at least one process condition having an associated range such that the respective rule is satisfied only where the at least one process condition is also within the associated range.

10. The system of claim 1, further comprising:

a constraint definition module for setting non-violable limiting constraints to at least one process condition such as to require a value of the at least one process condition to satisfy the limiting constraints.

11. The system of claim 1, further comprising:

a performance improvement determination module for determining process control improvements based on at least one of the at least one performance improvement rule set, the performance improvement determination module being configured to determine, for any rule and given process conditions, which of the outcomes is attainable based on the values of the activity flags.

12. The system of claim 11, wherein the given process conditions are historic process conditions, thereby enabling a best-value outcome to be determined for the historic process conditions.

13. The system of claim 11, further comprising:

a data logging module for logging real-time process conditions from a process system; and

wherein the given process conditions are ones of the logged real-time process conditions, thereby enabling a determination of optimal process conditions.

14. The system of claim 13, wherein the performance improvement determination module is configured to provide process control improvements to be applied to a process system.

15. A process development system, comprising:

a performance improvement determination module for determining process control improvements based on at least one performance improvement rule set for at least one process factor, each rule of a performance improvement rule set including a plurality of decision points corresponding to split variables relating to process conditions a plurality of outcomes and an activity flag at each decision point, each activity flag having one of two values indicative of whether the respective split variable is alterable or non-alterable by a process operator or an automated process control system, wherein the performance improvement determination module is configured to determine, for any rule and given process conditions, which of the outcomes is attainable based on the values of the activity flags.

16. The system of claim 15, wherein the or each rule is represented as a decision tree having a plurality of internal nodes and a plurality of terminal nodes, with the decision points being the internal nodes and the outcomes being the terminal nodes.

17. The system of claim 15, wherein the given process conditions are historic process conditions, thereby enabling a best-value outcome to be determined for the historic process conditions.

18. The system of claim 15, further comprising:

a data logging module for logging real-time process conditions from a process system; and

wherein the given process conditions are ones of the logged real-time process conditions, thereby enabling a determination of optimal process conditions.

19. The system of claim 18, wherein the performance improvement determination module is configured to provide process control improvements to be applied to a process system.

20. A process development method, comprising the steps of:

generating a performance improvement rule set for at least one process factor from a generated rule set for the at least one process factor, each rule of the or each generated rule set including a plurality of decision points corresponding to split variables relating to process conditions and a plurality of outcomes, the performance improvement rule generation step comprising the step of;

for each rule from the or each generated rule set, attaching an activity flag at each decision point to generate a performance improvement rules each activity flag having one of two values indicative of whether the respective split variable is alterable or non-alterable by a process operator or an automated process control system, such as to enable operation of the performance improvement rule in determining which of the outcomes is attainable for given process conditions.

21. The method of claim 20, wherein the or each rule is represented as a decision tree having a plurality of internal nodes and a plurality of terminal nodes, with the decision points being the internal nodes and the outcomes being the terminal nodes.

22. The method of claim 20, further comprising the step of:

generating the generated rule set for the at least one process factor by applying rule induction techniques to a rule-generation data set including data corresponding to process conditions.

23. The method of claim 22, further comprising the step of:

collecting historic process data and deriving the rule-generation data set from the historic process data.

24. The method of claim 23, wherein the historic process data collection step comprises the step of:

deriving the rule-generation data set and an extracted data set, unseen in generation of the generated rule set, from the historic process data.

25. The method of claim 22, further comprising the step of:

verifying the generated rule set for the at least one process factor.

26. The method of claim 25, further comprising the step of collecting historic process data and deriving the rule-generation data set and an extracted data set, unseen in generation of the generated rule set from the historic process data, and

wherein the generated rule set verification step comprises the step of:

testing the generated rule set by utilizing the extracted data set to satisfy that each rule is satisfied by the extracted data set.

27. The method of claim 25, wherein the generated rule set verification step comprises the step of:

re-invoking the rule set generation step to generate a modified generated rule set for the at least one process factor.

28. The method of claim 20, further comprising the step of:

attaching to any rule at least one process condition having an associated range such that the respective rule is satisfied only where the at least one process condition is also within the associated range.

29. The method of claim 20, further comprising the step of:

setting non-violable constraints to at least one process condition such as to require a value of the at least one process condition to satisfy the limiting constraints.

30. The method of claim 20, further comprising the step of:

determining process control improvements based on at least one of the at least one performance improvement rule set, the process control improvements determining step comprising the step of;

determining, for any rule and given process conditions, which of the outcomes is attainable based on the values of the activity flags.

31. The method of claim 30, wherein the given process conditions are historic process conditions, thereby enabling a best-value outcome to be determined for the historic process conditions.

32. The method of claim 30, further comprising the step of:

logging real-time process conditions from a process system; and

wherein the given process conditions are ones of the logged real-time process conditions, thereby enabling a determination of optimized process conditions.

33. The method of claim 32, wherein the process control improvements determining step further comprises the step of:

providing process control improvements to be applied to a process system.

34. A process development method, comprising the steps of:

determining process control improvements based on at least one performance improvement rule set for at least one process factor, each rule of a performance improvement rule set including a plurality of decision points corresponding to split variables relating to process conditions, a plurality of outcomes and an activity flag at each decision point, each activity flag having one of two values indicative of whether the respective split variable is alterable or non-alterable by a process operator or an automated process control system, wherein the process control improvements determining step comprises the step of;

determining, for any rule and given process conditions, which of the outcomes is attainable based on the values of the activity flags.

35. The method of claim 34, wherein the or each rule is represented as a decision tree having a plurality of internal nodes and a plurality of terminal nodes, with the decision points being the internal nodes and the outcomes being the terminal nodes.

36. The method of claim 34, wherein the given process conditions are historic process conditions, thereby enabling a best-value outcome to be determined for the historic process conditions.

37. The method of claim 34, further comprising the step of:

logging real-time process conditions from a process system; and

wherein the given process conditions are ones of the logged real-time process conditions, thereby enabling a determination of optimized process conditions.

38. The method of claim 37, wherein the process control improvements determining step further comprises the step of:

providing process control improvements to be applied to a process system.