HVAC System Fault Root Cause Self-Determination

Inactive Publication Date: 2013-08-01
CARRIER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]According to yet another aspect of the invention, a programmable control unit for self-determining a root cause in an HVAC system includes a controller configured for receiving a fault message indicative of a fault condition in an operating characteristic of the HVAC system and for determining a causal

Problems solved by technology

HVAC systems often do not function as well as expected due to faults developed during routine operation.
However, most faults, if unnoticed for a long period of time, could adversely affect system performance, life, and lifecycle cost.
A fault mode in one system component may cause issues

Method used

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  • HVAC System Fault Root Cause Self-Determination
  • HVAC System Fault Root Cause Self-Determination
  • HVAC System Fault Root Cause Self-Determination

Examples

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Embodiment Construction

[0013]Embodiments of a system for root cause self-determination of a fault condition in an HVAC system include a control unit assembly including software for utilizing fault tree analysis techniques, predetermined system knowledge, and current sensed information that is received from one or more sensors during the time of the fault condition. In an embodiment, the control unit assembly includes an integrated controller for operating the system in a diagnostic mode in order to gather additional data needed to narrow the fault condition down to a single root cause. In other embodiments, where the root causes may not be narrowed to a single root cause, the control unit assembly utilizes historical probabilities of the system as well as cost information regarding the components in the system to present the root causes in an optimal order to a user, for example, a technician to fix.

[0014]Referring to FIG. 1, there is shown an example of an environmental control system 100 including a con...

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Abstract

A method for self-determining a root cause of a system fault in a heating, ventilation, and cooling (HVAC) system includes receiving a fault message indicative of a fault condition in an operating characteristic of the HVAC system; determining a causal relationship between the fault condition and a predetermined list of root causes associated with the fault condition; receiving information indicative of operating conditions of the HVAC system; and eliminating at least one root cause that is unrelated to the fault condition in response to the receiving of the information.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. provisional patent application Ser. No. 61 / 590,934 filed Jan. 26, 2012, the contents of which are incorporated by referenced herein in their entirety.FIELD OF INVENTION[0002]This invention relates generally to heating, ventilation, and cooling (HVAC) systems for residential or light commercial air conditioning applications and, more particularly, to a method and system for a root cause self-determination of fault conditions in an HVAC system.DESCRIPTION OF RELATED ART[0003]HVAC systems often do not function as well as expected due to faults developed during routine operation. While these faults are indicative of a failure mode, many faults do not result in immediate system shut down or costly damages. However, most faults, if unnoticed for a long period of time, could adversely affect system performance, life, and lifecycle cost.[0004]Fault diagnostics refer to detection of faults and identifica...

Claims

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Application Information

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IPC IPC(8): F24F11/00
CPCF24F11/0009F24F2011/0091F24F2011/0052F24F11/0086F24F11/30F24F11/32F24F11/52F24F11/38
Inventor SHAH, RAJENDRA K.ADEPETU, ADEYEMI A.
Owner CARRIER CORP
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