Systems and methods for using rule-based fault detection in a building management system

摘要

A controller for a building management system includes a system of rules for detecting faults in the building management system. The rules include content conditions and trigger conditions. The content conditions are not checked until one or more of the trigger conditions are met. A rule-based fault detection engine may be implemented by a low level building equipment controller. One or more thresholds for a rule may be automatically or manually adjusted.

主权项

1. A method for detecting faults in a building management system, the method comprising:
at a computer of the building management system, using a stored rule condition to detect a first fault in the building management system, the stored rule condition utilizing a stored threshold value; using the computer to determine whether to adjust the stored threshold value based on at least one of fault detection data or building management system performance data, wherein determining whether to adjust the stored threshold value comprises identifying a frequency with which the first fault is detected when the stored threshold value is used in the stored rule condition and comparing the identified frequency with a stored frequency value, wherein the computer determines to adjust the stored threshold value in response to the identified frequency exceeding the stored frequency value; determining a new threshold value for the stored rule condition in response to a determination to adjust the stored threshold value; adjusting the stored rule condition to utilize the new threshold value by replacing the stored threshold value with the new threshold value, wherein the stored threshold value is replaced with the new threshold value in response to a determination to adjust the stored threshold value and wherein the stored threshold value is not replaced with the new threshold value in the absence of a determination to adjust the stored threshold value; and at the computer, using the adjusted rule condition to detect a second fault in the building management system.