Patent ID: 9639413
Date: 2017-05-02
CPC Classifications: G05B,G06F,G06Q,H02J,Y02B,Y04S

Claim:
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.