Method For Message Suppression In Rule Based Expert System

• US 20090319464A1
• Filed: 08/28/2009
• Published: 12/24/2009
• Est. Priority Date: 01/24/2006
• Status: Active Grant

• Current Assignee: ExxonMobil Chemical Patents Inc. (Exxon Mobil Corporation)
• Original Assignee: ExxonMobil Chemical Patents Inc. (Exxon Mobil Corporation)
• Inventors: Sandell, David Jack, Kral, Bohumil Vaclav
• Granted Patent: US 7,739,217 B2
• Time in Patent Office: Days
• US Class Current: 706/47
• CPC Class Codes: G06N 5/04 Inference or reasoning models
• CPC Class Codes: Y10S 526/901 Monomer polymerized in vapor state in presence of transition metal containing catalyst
• CPC Class Codes: Y10S 526/905 Polymerization in presence of transition metal containing catalyst in presence of hydrogen

Abstract

One exemplary method for message suppression comprises: providing first and second rules, each having one or more preconditions and a conclusion, wherein the first rule also has a suppressed-by attribute and at least one of the second preconditions is suppressing; evaluating the one or more first and second preconditions; identifying the first rule as true or false; displaying the message of the second rule if all of the second preconditions are met; identifying the first rule as suppressed if the second rule is named in the suppressed-by attribute; and inhibiting the message display of the suppressed rule or routing the message to second display. The system can comprise: a database containing knowledge of the production unit; a user interface, and at least one precondition, a suppressed by attribute, and one or more rules each having a conclusion and at least one suppressing precondition; an inference engine; and a display.

Claims

1. A method for monitoring a polyethylene polymerization system, comprising:

(a) providing an expert system comprising a database containing knowledge of the polymerization system and an inference engine, wherein the inference engine comprises;

(i) a first rule having one or more preconditions, a suppressed-by attribute, and a message; and

(ii) a second rule having one or more preconditions and a message, wherein at least one of the one or more preconditions is a suppressing precondition;

(b) receiving data from the polymerization system;

(c) evaluating the data from the polymerization system against one or more preconditions of the first rule and the second rule;

(d) identifying the first rule as true or false; and

(e) displaying the message of the second rule if all of the one or more preconditions of the second rule are met.

2. The method of claim 1, further comprising identifying the second rule in the suppressed by attribute of the first rule.

3. The method of claim 1, wherein the first rule is a suppressed rule.

4. The method of claim 1, wherein the second rule is a non-suppressed rule.

5. The method of claim 1, wherein the first rule message is not displayed or is routed to a second display.

19. The method of claim 1, further comprising identifying the second rule in the suppressed by attribute of the message of the first rule.

6. A method for monitoring a polyethylene polymerization system, comprising:

(a) providing an expert system comprising a database containing knowledge of the polymerization system and an inference engine, wherein the inference engine comprises;

(i) a first rule having one or more preconditions, a suppressed-by attribute, and a message; and

(ii) a second rule having one or more preconditions and a message, wherein at least one of the one or more preconditions is a suppressing precondition;

(b) receiving data from the polymerization system;

(c) evaluating the data from the polymerization system against one or more preconditions of the first rule and the second rule;

(d) identifying the first rule as true or false; and

(e) displaying the message of the second rule on a first display if all of the one or more preconditions of the first rule are met and if all of the one or more preconditions of the second rule are met.

7. The method of claim 6, wherein the one or more preconditions of the second rule are conditioned on the one or more preconditions of the first rule.

8. The method of claim 6, further comprising identifying the second rule in the suppressed by attribute of the first rule.

9. The method of claim 6, wherein the first rule is a suppressed rule.

10. The method of claim 6, wherein the second rule is a non-suppressed rule.

11. The method of claim 6, wherein the first rule message is not displayed or is routed to a second display.

12. A method for monitoring a polyethylene polymerization system, comprising:

(a) providing a database containing knowledge of the polymerization system, wherein the database comprises;

(i) at least one suppressed rule having one or more preconditions, a suppressed by attribute, and a message; and

(ii) at least one non-suppressed rule having one or more preconditions and a message;

(b) receiving data from the polymerization system;

(c) evaluating data from the polymerization system against the one or more preconditions of the rules to determine a status of the rules as true or false; and

(d) displaying the message of the non-suppressed rule, if determined true, on a first display without changing the status of the suppressed rule.

13. The method of claim 12, wherein the one or more preconditions of the non-suppressed rule are conditioned on the one or more preconditions of the suppressed rule.

14. The method of claim 12, further comprising directing the message of the suppressed rule to a second display or record log.

15. The method of claim 14, wherein the first display has higher priority than a priority of the second display.

16. The method of claim 12, further comprising displaying the message of the suppressed rule, if the suppressed rule is determined true and the non-suppressed rule is determined false.

17. The method of claim 12, further comprising displaying an identification of the non-suppressed rule in the suppressed by attribute of the suppressed rule.

18. A method for monitoring a polyethylene polymerization system, comprising:

(a) providing an expert system comprising a database containing knowledge of the polymerization system and an inference engine, wherein the inference engine comprises;

(i) a first rule having one or more preconditions, and a message having a suppressed-by attribute; and

(ii) a second rule having one or more preconditions and a message, wherein at least one of the one or more preconditions is a suppressing precondition;

(b) receiving data from the polymerization system;

(c) evaluating the data from the polymerization system against one or more preconditions of the first rule and the second rule;

(d) identifying the first rule as true or false; and

(e) displaying the message of the second rule if all of the one or more preconditions of the second rule are met.

20. A method for monitoring a polyethylene polymerization system, comprising:

(a) providing an expert system comprising a database containing knowledge of the polymerization system and an inference engine, wherein the inference engine comprises;

(i) a first rule having one or more preconditions, and a message having a suppressed-by attribute; and

(ii) a second rule having one or more preconditions and a message, wherein at least one of the one or more preconditions is a suppressing precondition;

(b) receiving data from the polymerization system;

(c) evaluating the data from the polymerization system against one or more preconditions of the first rule and the second rule;

(d) identifying the first rule as true or false; and

(e) displaying the message of the second rule on a first display if all of the one or more preconditions of the first rule are met and if all of the one or more preconditions of the second rule are met.

21. The method of claim 20, wherein the one or more preconditions of the second rule are conditioned on the message of the first rule.

22. The method of claim 20, further comprising identifying the second rule in the suppressed by attribute of the message of the first rule.

23. The method of claim 20, wherein the message of the first rule is a suppressed message.

24. The method of claim 20, wherein the second rule is a non-suppressed rule.

25. The method of claim 20, wherein the suppressed message is not displayed or is routed to a second display.