Systems and methods for fault detection and handling by assessing building equipment performance
First Claim
1. A system for detecting faults in building equipment, the system comprising:
- an integration fault detector configured to detect faults in the building equipment by analyzing time series data using an integration fault detection technique;
a kernel density fault detector configured to detect faults in the building equipment by analyzing the time series data using a kernel density estimation fault detection technique; and
a fault detector selector configured to select the integration fault detector or the kernel density fault detector for use in detecting faults in the building equipment based on an attribute of the time series data; and
a building equipment controller configured to adjust an operation of the building equipment in response to detecting one or more faults in the building equipment.
3 Assignments
0 Petitions
Accused Products
Abstract
A system for detecting faults in building equipment includes an integration fault detector, a kernel density fault detector, and a fault detector selector. The integration fault detector is configured to detect faults in the building equipment by analyzing time series data using an integration fault detection technique. The kernel density fault detector is configured to detect faults in the building equipment by analyzing the time series data using a kernel density estimation fault detection technique. The fault detector selector is configured to select the integration fault detector or the kernel density fault detector for use in detecting faults in the building equipment based on an attribute of the time series data.
14 Citations
27 Claims
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1. A system for detecting faults in building equipment, the system comprising:
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an integration fault detector configured to detect faults in the building equipment by analyzing time series data using an integration fault detection technique; a kernel density fault detector configured to detect faults in the building equipment by analyzing the time series data using a kernel density estimation fault detection technique; and a fault detector selector configured to select the integration fault detector or the kernel density fault detector for use in detecting faults in the building equipment based on an attribute of the time series data; and a building equipment controller configured to adjust an operation of the building equipment in response to detecting one or more faults in the building equipment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for detecting faults in building equipment using an integration fault detection technique, the method comprising:
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operating the building equipment to generate time series data and receiving the time series data, wherein the time series data comprises a plurality of data points each having a value affected by an operation of the building equipment; calculating a modified z-score for each of the plurality of data points; calculating a distance value for each of the plurality of data points, the distance value indicating a difference between the modified z-score for the data point and an outlier threshold; generating, for each of the plurality of data points, a cumulative sum of the distance values calculated for the data point and any previous data points in the time series data; calculating, for each of the plurality of data points, a performance metric based on the cumulative sum for the data point; detecting faults in the building equipment by comparing the calculated performance metrics to one or more performance thresholds; and adjusting the operation of the building equipment in response to detecting one or more faults in the building equipment. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method for detecting faults in building equipment using a kernel density fault detection technique, the method comprising:
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operating the building equipment to generate time series data and receiving the time series data, wherein the time series data comprise a plurality of data points each having a value affected by an operation of the building equipment; calculating modified z-scores comprising a modified z-score for each of the plurality of data points; generating a kernel density distribution based on the modified z-scores; generating a cumulative distribution function based on the kernel density distribution; determining one or more control chart thresholds using the cumulative distribution function; detecting faults in the building equipment by applying control chart rules and the control chart thresholds to the modified z-scores; and adjusting the operation of the building equipment in response to detecting one or more faults in the building equipment. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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Specification