Patent ID: 11875278
Assignee: JOHNSON CONTROLS TYCO IP HOLDINGS LLP
Field: Control (Instruments)
Classification: CPC G  H | IPC G  H

Claim 19:
20. A door lock fault detection system comprising:
one or more non-transitory computer-readable storage media having instructions stored thereon that, when executed by one or more processors, cause the one or more processors to implement operations comprising:
receiving door lock data collected from one or more sensors for one or more doors within a building indicating operation of the one or more doors;
selecting a period for which the door lock data was collected;
selecting a first door from the one or more doors of the building for which the door lock data is collected;
detecting a plurality of event pairs in the door lock data, each event pair comprising a first event occurring at the first door at a first time and a second event occurring at the first door at a second time;
segmenting the door lock data into a plurality of segments corresponding to the plurality of event pairs, each segment defining a time interval that elapses between the first event and the second event of the corresponding event pair;
applying a generated model to the plurality of segments of the door lock data;
computing a probability metric for each segment of the plurality of segments of the door lock data base on the time interval that elapses between the first event and the second event of the corresponding event pair;
computing a combined probability score for the first door based on the probability metrics for each segment of the plurality of segments of the door lock data, wherein the combined probability score indicates normal function or malfunction of the door;
applying a threshold to the combined probability score for the first door to classify the first door as normally functioning responsive to the combined probability score being at or below the threshold and classifying the first door as malfunctioning responsive to the combined probability score being above the threshold; and
generating an alert responsive to the combined probability score for the first door being above the threshold.