Complex system diagnostics from electronic manuals

• US 20070124265A1
• Filed: 11/29/2005
• Published: 05/31/2007
• Est. Priority Date: 11/29/2005
• Status: Abandoned Application

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Kulkarni, Sandeep, Hebbani, Hari, Nagar, Aseem, Joshi, Vadiraj, Kadeppagari, Murali, Venkataraman, Sreedharan
• Application Number:
  US11/288,593
• Publication Number:
  US 20070124265A1
• Time in Patent Office: Days
• US Class Current: 706/45
• CPC Class Codes: G06N 5/04 Inference or reasoning models

Abstract

In accordance with one aspect of the present invention, a method for implementing a diagnostic system pertaining to a complex system includes receiving, by a computer implemented system, an observed symptom that characterizes a discrepancy report of a complex system, associating the observed symptom with contents of at least one electronic manual to capture relevant information therefrom, and evaluating the relevant information by the computer implemented system to recommend at least one desired action for mitigation of the discrepancy report without assuming knowledge about a historical discrepancy report similar to the reported discrepancy.

Claims

1. A method for implementing a diagnostic system comprising:

receiving an observed symptom that characterizes a discrepancy report of a complex system, wherein the observed symptom is received by a computer implemented system;

associating the observed symptom with contents of at least one electronic manual to capture relevant information therefrom; and

,

evaluating the relevant information by the computer implemented system to recommend at least one desired action for mitigation of the discrepancy report without assuming knowledge about a historical discrepancy report similar to the reported discrepancy.

2. The method of claim 1, wherein the contents of the electronic manual comprises data characterizing a plurality of standard symptoms, a plurality of potential diagnostic faults pertaining to the complex system, a plurality of desired actions representing the corrective action, an association of each of the plurality of standard symptoms to corresponding ones of the plurality of diagnostic faults, and an association of each of the plurality of diagnostic faults to corresponding ones of the plurality of desired actions.

3. The method of claim 1, wherein the electronic manual conforms to a markup language.

4. The method of claim 3, wherein the markup language comprises a SGML structured format.

5. The method of claim 1, further comprising querying the electronic manual selected from the group consisting of a trouble shooting document, a schematic manual, a maintenance manual, a parts catalogue, and a wiring manual.

6. The method of claim 5, further comprising:

(a) retrieving one or more relevant standard symptoms from the electronic manual by correlating the observed symptom with the standard symptoms using the computer implemented system;

(b) selecting one relevant standard symptom;

(c) identifying at least one potential diagnostic fault associated with the selected relevant standard symptom;

(d) determining whether the potential diagnostic fault is isolated based on an association of the fault with the selected relevant standard symptom;

(e) retrieving at least another standard symptom associated with the potential diagnostic faults identified at (c) in case of non-isolation thereof;

(f) repeating (b)-(e) to isolate the potential diagnostic fault associated with the relevant standard symptom; and

,

(g) associating each of the isolated diagnostic faults with a desired action so as to enable recommendation of at least one desired action.

7. The method of claim 6, wherein the standard symptoms are accumulated across the electronic manual during a pre-processing phase comprising:

cleaning a semantic structure of each of the standard symptoms available across the electronic manual to extract distinct words therefrom; and

,

generating a term frequency matrix with each column representing a term characterizing the distinct word and each row representing a corresponding standard symptom, wherein each entry of the term frequency matrix represents a relative weight to be accorded if any of the distinct word is found in the corresponding standard symptom.

8. The method of claim 6, wherein the correlating comprises:

cleaning a semantic structure of the observed symptom that characterizes the discrepancy report to extract distinct words therefrom;

generating a vector with each column representing a term characterizing the distinct word and a row representing corresponding observed symptom, wherein an entry of the vector represents a relative weight to be accorded if any of the distinct word is found in the corresponding observed symptom;

normalizing each entry of the vector according to following equation;

ent(1, j) = (1 + log(tf_1j))log(N/df_j)iftf_1j ≧

1ent(1, j) = 0iftf1j = 0

wherein tf_1j represents a number of occurrences of the jth word in the observed symptom, wherein ent (1,j) represents an entry of the vector, wherein N represents an aggregate number of standard symptoms, and wherein df_j represents a total number of occurrences of the term in the standard symptoms;

evaluating a distance between the vector and each row of the term frequency matrix; and

,

based on the evaluation, selecting at least one standard symptom as the relevant standard symptoms correlated with the observed symptom.

9. The method of claim 8, wherein the distance is evaluated according to following equation:

Distance=a cos {(x₁y₁+x₂y₂+ . . . )/[Sqrt(x₁²+x₂²+ . . . )*Sqrt(y₁²+y₂²+ . . . )]}

wherein a cos represents a cosine inverse trigonometric relationship, wherein y_i represents the i^th entry of the row in the term frequency matrix from which distance is evaluated, wherein Sqrt represents a Square Root Mathematical operation, and wherein x_j represents the j^th entry of the vector determined from the observed symptom.

10. The method of claim 8, wherein the distinct word comprises synonyms thereof.

11. The method of claim 7, wherein the term frequency matrix is represented in a sparse matrix.

12. The method of claim 7, wherein an entry in row i and column j of the term frequency matrix is evaluated according to following equation

Entry (i, j) = (1 + log (tf_ij)) log (N/df_i) if tf_ij >

13. A method for implementing a diagnostic system comprising:

receiving an observed symptom that characterizes a discrepancy report of a complex system, wherein the observed symptom is received by a computer implemented system;

associating the observed symptom with contents of a plurality of electronic manual conforming to a SGML format to capture relevant information therefrom; and

,

evaluating the relevant information by the computer implemented system to recommend at least one corrective action for mitigation of the discrepancy report without assuming knowledge about a historical discrepancy report similar to the reported discrepancy, wherein the corrective action is evaluated from data characterizing an association of each of a plurality of standard symptoms to corresponding ones of a plurality of diagnostic faults and an association of each of the plurality of diagnostic faults to corresponding ones of a plurality of corrective actions.

14. A computer readable medium carrying one or more sequences of instruction for causing a digital processing system to implement a diagnostic system, wherein the sequences of instruction are performed by at least one processor to execute functions of:

receiving an observed symptom that characterizes a discrepancy report of a complex system;

associating the observed symptom with contents of at least one electronic manual to capture relevant information therefrom; and

,

evaluating the relevant information by the digital processing system to recommend at least one desired action for mitigation of the discrepancy report without assuming knowledge about a historical discrepancy report similar to the reported discrepancy.

15. The computer readable medium of claim 14, wherein the contents of the electronic manual comprises data characterizing a plurality of standard symptoms, a plurality of potential diagnostic faults pertaining to the complex system, a plurality of desired actions representing corrective action, an association of each of the plurality of standard symptoms to corresponding ones of the plurality of diagnostic faults, and an association of each of the plurality of diagnostic faults to corresponding ones of the plurality of desired actions.

16. The computer readable medium of claim 14, wherein the electronic manual conforms to a markup language.

17. The computer readable medium of claim 16, wherein the markup language comprises a SGML structured format.

18. The computer readable medium of claim 14, wherein the functions further comprises querying the electronic manual selected from the group consisting of a trouble shooting document, a schematic manual, a maintenance manual, a parts catalogue, and a wiring manual.

19. The computer readable medium of claim 14, wherein the functions further comprises:

(a) retrieving one or more relevant standard symptoms from standard symptoms in the electronic manual by correlating the observed symptom with the standard symptoms using the digital processing system;

(b) selecting one of the relevant standard symptoms;

(c) identifying at least one potential diagnostic fault associated with the selected relevant standard symptom;

(d) determining whether the potential diagnostic fault is isolated based on an association of the fault with the relevant standard symptom;

(e) retrieving at least another standard symptom associated with the potential diagnostic fault identified at (c) in case of non-isolation thereof;

(f) repeating (b)-(e) to isolate the potential diagnostic fault associated with the relevant standard symptom; and

,

(g) associating each of the isolated diagnostic faults with a plurality of desired actions to enable recommendation of at least one desired action.

20. The computer readable medium of claim 19, wherein all the standard symptoms are accumulated during a pre-processing phase comprising:

cleaning a semantic structure of each of the standard symptoms available across the electronic manual to extract distinct words therefrom; and

,

generating a term frequency matrix with each column representing a term characterizing the distinct word and each row representing a corresponding standard symptom, wherein each entry of the term frequency matrix represents a relative weight to be accorded if any of the distinct words is found in the corresponding standard symptom.

21. The computer readable medium of claim 20, wherein the correlating comprises:

cleaning a semantic structure of the observed symptom that characterizes the discrepancy report to extract distinct words therefrom;

generating a vector with each column representing a term characterizing the distinct word and a row representing a corresponding observed symptom, wherein each entry of the vector represents a relative weight to be accorded if any of the distinct words is found in the corresponding observed symptom;

normalizing each entry of the vector according to following equation;

ent(1, j) =(1 + log(tf_1j))log(N/df_j)iftf_1j ≧

1ent(1, j) =0iftf1j = 0

wherein tf_1j represents a number of occurrences of the jth word in the observed symptom, wherein ent(1,j) represents an entry of the vector, wherein N represents the aggregate number of standard symptoms, and wherein df_j represents the total number of occurrences of the term in the standard symptoms;

evaluating a distance between the vector and each row of the term frequency matrix; and

,

based on the evaluation, selecting at least one standard symptom as the relevant standard symptoms correlated with the observed symptom.

22. The computer readable medium of claim 21, wherein the distance is evaluated according to following equation:

Distance=a cos {(x₁y₁+x₂y₂+ . . . )/[Sqrt(x₁²+x₂²+ . . . )*Sqrt(y₁²+y₂²+ . . . )]}

wherein a cos represents a cosine inverse trigonometric relationship, wherein yi represents the ith entry of the row in the normalized term frequency matrix from which distance is evaluated, wherein Sqrt represents a Square Root Mathematical operation, and wherein x_j represents the j_th entry of the normalized vector determined from the observed symptom.

23. The computer readable medium claim 21, wherein the distinct word comprises synonyms thereof.

24. The computer readable medium claim 20, wherein the term frequency matrix is represented in a sparse matrix.

25. The computer readable medium of claim 20, wherein an entry in row i and column j of the term frequency matrix is evaluated according to following equation:

Entry (i, j) = (1 + log (tf_ij)) log (N/df_j) if tf_ij >

= 1 0 if tf_ii = 0

wherein tf_ij represents the term frequency, wherein N represents total number of standard symptoms across the electronic manual, and wherein df_j represents total number of occurrences of the distinct words in the standard symptoms.