Detecting and diagnosing faults in HVAC equipment

Details Detecting and diagnosing faults in HVAC equipment Detecting and diagnosing faults in HVAC equipment

2006-08-01

2008-10-28

Hofsass, Jeff (Department: 2612)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Quality evaluation

C340S679000, C700S079000, C700S108000, C702S108000, C702S113000

Reexamination Certificate

active

07444251

ABSTRACT:
A method and system detects and diagnoses faults in heating, ventilating and air conditioning (HVAC) equipment. Internal state variables of the HVAC equipment are measured under external driving conditions. Expected internal state variables are predicted for the HVAC equipment operating under the external driving conditions using a locally weighted regression model. Features are determined of the HVAC based on differences between the measured and predicted state variables. The features are classified to determine a condition of the HVAC equipment.

REFERENCES:
patent: 6223544 (2001-05-01), Seem
patent: 7188482 (2007-03-01), Sadegh et al.
patent: 2004/0267395 (2004-12-01), Discenzo et al.
patent: 2007/0156373 (2007-07-01), Yamashita et al.
patent: 2008/0039993 (2008-02-01), Cleary et al.

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