The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 2026
Filed:
Jan. 16, 2020
Honeywell International Inc., Morris Plains, NJ (US);
Xiaoli Wang, Beijing, CN;
Chunfu Li, Beijing, CN;
HONEYWELL INTERNATIONAL INC., Charlotte, NC (US);
Abstract
A HVAC system and method for determining which fault of a group of faults identifies a likely root cause problem in the system. Some example methods may include a controller identifying the root cause based at least partially on which fault is associated with a HVAC device (e.g., boiler, chiller, VAV valve, etc.) that is farthest upstream along a shared fluid flow path or fluid flow network of the HV AC system. In some examples, the shared fluid flow path or network may be defined in a HVAC model representing the HVAC system. The controller may store the HVAC model and reference it when analyzing a group of faults. The controller may limit the inclusion of faults in a group for analysis to only those faults that occur within a certain period of time of each other.