Automated fault detection and diagnostics in a building management system
First Claim
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1. A controller for detecting energy usage faults in a building management system, the controller comprising:
- a processing circuit configured to maintain a history of energy usage values for the building management system;
wherein the processing circuit is configured to calculate a threshold parameter using a first subset of the history of energy usage values defined by a sliding time window, the threshold parameter establishing an energy usage value limit relative to the history of energy usage values;
wherein the processing circuit is configured to identify energy outlier days by comparing energy use for a first day with the threshold parameter;
wherein the processing circuit is configured to dynamically update the threshold parameter by sliding the time window forward in time to define a second subset of the history of energy usage values and using the second subset of the history of energy usage values to calculate an updated threshold parameter;
wherein the processing circuit is configured to identify energy outlier days by comparing energy use for a second day with the updated threshold parameter.
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Abstract
Systems and methods for building automation system management are shown and described. The systems and methods relate to fault detection via abnormal energy monitoring and detection. The systems and methods also relate to control and fault detection methods for chillers. The systems and methods further relate to graphical user interfaces for use with fault detection features of a building automation system.
375 Citations
18 Claims
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1. A controller for detecting energy usage faults in a building management system, the controller comprising:
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a processing circuit configured to maintain a history of energy usage values for the building management system; wherein the processing circuit is configured to calculate a threshold parameter using a first subset of the history of energy usage values defined by a sliding time window, the threshold parameter establishing an energy usage value limit relative to the history of energy usage values; wherein the processing circuit is configured to identify energy outlier days by comparing energy use for a first day with the threshold parameter; wherein the processing circuit is configured to dynamically update the threshold parameter by sliding the time window forward in time to define a second subset of the history of energy usage values and using the second subset of the history of energy usage values to calculate an updated threshold parameter; wherein the processing circuit is configured to identify energy outlier days by comparing energy use for a second day with the updated threshold parameter. - View Dependent Claims (2, 3, 4, 5)
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6. A controller for detecting energy usage faults in a building management system, the controller comprising:
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a processing circuit configured to maintain a history of energy usage values for the building management system; wherein the processing circuit is configured to use the history of energy usage values to identify a daily energy usage feature for each of a plurality of days represented in the history of energy usage values; wherein the processing circuit is configured to group like days based on the identified daily energy usage features to create a plurality of day-type groups; wherein the processing circuit is configured to calculate a threshold parameter of daily energy usage for each day-type group using the history of energy usage values for the days in the day-type group for which the threshold parameter is calculated; wherein the processing circuit is configured to identify energy outlier days by comparing energy use for a day with one of the calculated threshold parameters. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A computerized method for detecting faults in building equipment, the method comprising:
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comparing an actual performance of building equipment to an expected performance of the building equipment, wherein the comparison comprises calculating an error between the actual performance and the expected performance; applying results of a statistical analysis to the comparison to identify a deviation from the expected performance, wherein identifying a deviation from the expected performance comprises maintaining an exponentially weighting moving average of the error and comparing the exponentially weighted moving average to a threshold; determining whether to identify the error as associated with an equipment fault based on whether the exponentially weighted moving average exceeds the threshold; and generating an output signal indicative of an equipment fault in response to the exponentially weighted moving average exceeding the threshold. - View Dependent Claims (17, 18)
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Specification