System and method for conflict resolution to support simultaneous monitoring of multiple subsystems

• US 8,473,252 B2
• Filed: 06/09/2010
• Issued: 06/25/2013
• Est. Priority Date: 06/09/2010
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Kar, Chinmaya, Kini, Venkataramana Bantwal, Agrawal, Vedika, Sunderam, Meenakshi
• Primary Examiner(s): COSIMANO, EDWARD R
• Application Number:
  US12/797,472
• Publication Number:
  US 20110307218A1
• Time in Patent Office: 1,112 Days
• Field of Search: 735/70, 735/77, 735/79, 738/658, 738/659, 738/663, 340/500, 340/540, 340/679, 340/582, 340/683, 702/1, 702/33, 702/34, 702/35, 702/39, 702/56, 702/127, 702/182, 702/183, 702/185, 702/189, 706/902, 706/911, 706/912, 706/914
• US Class Current: 702/185
• CPC Class Codes: G05B 23/0221 Preprocessing measurements, e.g. data collection rate adjustment; Standardization of measurements; Time series or signal analysis, e.g. frequency analysis or wavelets; Trustworthiness of measurements; Indexes therefor; Measurements using easily measured parameters to estimate parameters difficult to measure; Virtual sensor creation; De-noising; Sensor fusion; Unconventional preprocessing inherently present in specific fault detection methods like PCA-based methods

Abstract

A system includes a subsystem interaction module device, which includes at least one interface configured to receive input signals associated with multiple components of a system. The subsystem interaction module device also includes at least one processing unit configured to identify a potential fault in one or more of the components using the input signals and to provide an indicator identifying the potential fault. The at least one processing unit is configured to identify the potential fault by: identifying conflicting frequencies that are associated with different faults in the components of the system; and determining a confidence level associated with the potential fault based on the conflicting frequencies.

Claims

1. An apparatus comprising:

at least one interface configured to receive input signals associated with multiple components of a system from one or more sensors that are configured to monitor the system; and

at least one processing unit configured to identify a potential fault in one or more of the components using the input signals and to provide an indicator identifying the potential fault;

wherein the at least one processing unit is configured to identify the potential fault by;

identifying conflicting frequencies that are associated with different faults in the components of the system; and

determining a confidence level associated with the potential fault based on the conflicting frequencies.

2. The apparatus of claim 1, wherein the conflicting frequencies comprise overlapping frequencies associated with the different faults.

3. The apparatus of claim 1, wherein the at least one processing unit is configured to identify the conflicting frequencies by determining that at least two of the components have a matching configuration.

4. The apparatus of claim 1, wherein the at least one processing unit is configured to identify the potential fault by at least one of:

comparing a noise floor associated with the input signals to a noise floor corresponding to a normal operation; and

comparing at least one ratio associated with one or more families of frequencies to at least one threshold.

5. The apparatus of claim 1, wherein the at least one processing unit is configured to:

determine if more than one sensor is used to monitor two of the components;

calculate a single indicator and set a confidence level to 50% when the two components are monitored by a single sensor; and

calculate multiple indicators and set a separate confidence level for each of the indicators when the two components are monitored by different sensors.

6. The apparatus of claim 1, wherein the at least one processing unit is configured to average multiple indicators associated with the potential fault over a specified persistent time.

7. The apparatus of claim 1, wherein the at least one processing unit is configured to determine the confidence level based on one or more ratios of energy levels associated with different frequency components of the input signals.

8. The apparatus of claim 7, wherein the at least one processing unit is further configured to lessen the indicator for the potential fault based on the determined confidence level.

9. A method comprising:

receiving, from one or more sensors, input signals associated with multiple components of a system;

identifying, by at least one processing unit, one or more frequencies for each of multiple faults that could occur in the components;

identifying, by the at least one processing unit, conflicting frequencies that are associated with different faults in the components;

identifying, by the at least one processing unit, a potential fault in one or more of the components using the input signals;

determining, by the at least one processing unit, a confidence level associated with the potential fault based on the conflicting frequencies; and

outputting, by the at least one processing unit, an indicator identifying the potential fault.

10. The method of claim 9, wherein the conflicting frequencies comprise overlapping frequencies associated with the different faults.

11. The method of claim 9, wherein identifying the conflicting frequencies comprises determining that at least two of the components have a matching configuration.

12. The method of claim 9, wherein determining the confidence level comprises determining the confidence level based on one or more ratios of energy levels associated with different frequency components of the input signals.

13. The method of claim 9, wherein identifying the potential fault comprises at least one of:

comparing a noise floor associated with the input signals to a noise floor corresponding to a normal operation; and

comparing at least one ratio associated with one or more families of frequencies to at least one threshold.

14. The method of claim 9, further comprising:

determining if more than one sensor is used to monitor two of the components;

calculating a single indicator and setting a confidence level to a specified confidence level when the two components are monitored by a single sensor; and

calculating multiple indicators and setting a separate confidence level for each of the indicators when the two components are monitored by different sensors.

15. A non-transitory computer readable medium:

storing a plurality of instructions configured to cause a processing system to perform the steps of;

receiving input signals associated with multiple components of a system;

identifying one or more frequencies for each of multiple faults that could occur in the components;

identifying conflicting frequencies that are associated with different faults in the components;

identifying a potential fault in one or more of the components using the input signals;

determining a confidence level associated with the potential fault based on the conflicting frequencies; and

outputting an indicator identifying the potential fault.

16. The non-transitory computer readable medium of claim 15, wherein the conflicting frequencies comprise overlapping frequencies associated with the different faults.

17. The non-transitory computer readable medium of claim 15, wherein the instructions for identifying the conflicting frequencies comprise instructions configured to cause the processing system to determine that at least two of the components have a matching configuration.

18. The non-transitory computer readable medium of claim 15, wherein the instructions for determining the confidence level comprise instructions configured to cause the processing system to determine the confidence level based on one or more ratios of energy levels associated with different frequency components of the input signals.

19. The non-transitory computer readable medium of claim 15, wherein the instructions for identifying the potential fault comprise instructions configured to cause the processing system to at least one of:

compare a noise floor associated with the input signals to a noise floor corresponding to a normal operation; and

compare at least one ratio associated with one or more families of frequencies to at least one threshold.

20. The non-transitory computer readable medium of claim 15, further comprising instructions configured to cause the processing system to perform the steps of:

determining if more than one sensor is used to monitor two of the components;

calculating a single indicator and setting a confidence level to 50% when the two components are monitored by a single sensor; and

calculating multiple indicators and setting a separate confidence level for each of the indicators when the two components are monitored by different sensors.