Systems and methods for statistical control and fault detection in a building management system
First Claim
Patent Images
1. A controller for a building management system comprising:
- a processing circuit configured to at least one of receive or calculate an updated performance value for the building management system;
wherein the processing circuit is further configured to maintain at least one threshold parameter relative to a history of performance values, to determine an exponentially weighted moving average of the performance values, and to compare the moving average to the at least one threshold parameter, wherein the threshold parameter is maintained by multiplying an estimator of scale of the history by a constant value and at least one of adding or subtracting a result of the multiplication to or from a median of the history; and
wherein the processing circuit is further configured to generate an output that indicates a result of the comparison.
1 Assignment
0 Petitions
Accused Products
Abstract
A building management strategy includes using exponentially weighted moving averages with statistical models to detect changes in the behavior of the building management system. Detected changes in the behavior of the system may indicate a detected fault, a change in a predicted behavior, or a need for the statistical models to be updated.
-
Citations
10 Claims
-
1. A controller for a building management system comprising:
-
a processing circuit configured to at least one of receive or calculate an updated performance value for the building management system; wherein the processing circuit is further configured to maintain at least one threshold parameter relative to a history of performance values, to determine an exponentially weighted moving average of the performance values, and to compare the moving average to the at least one threshold parameter, wherein the threshold parameter is maintained by multiplying an estimator of scale of the history by a constant value and at least one of adding or subtracting a result of the multiplication to or from a median of the history; and wherein the processing circuit is further configured to generate an output that indicates a result of the comparison. - View Dependent Claims (2, 3, 4)
-
-
5. A method of detecting faults in a building management system, the method comprising:
-
at a computer of the building management system, receiving first performance values for the building management system; calculating an exponentially weighted moving average using the first performance values; generating a threshold parameter by multiplying an estimator of scale of the first performance values by a constant value and at least one of adding or subtracting a result of the multiplication to or from a median of the first performance values; comparing the moving average to the threshold parameter; receiving new performance values for the building management system; and updating the threshold parameter using the new performance values. - View Dependent Claims (6, 7, 8, 9, 10)
-
Specification