US 11,655,993 B2
Sound-based diagnostics for a combustion air inducer
Payam Delgoshaei, Addison, TX (US); and Glenn William Kowald, Carrollton, TX (US)
Assigned to Lennox Industries Inc., Richardson, TX (US)
Filed by Lennox Industries Inc., Richardson, TX (US)
Filed on May 28, 2021, as Appl. No. 17/333,543.
Prior Publication US 2022/0381463 A1, Dec. 1, 2022
Int. Cl. F24F 11/38 (2018.01); F24F 11/56 (2018.01); F24F 11/63 (2018.01); F24F 11/64 (2018.01); F27D 21/04 (2006.01); G05B 13/02 (2006.01); G10L 25/51 (2013.01); F27D 21/00 (2006.01); F27D 19/00 (2006.01)
CPC F24F 11/38 (2018.01) [F24F 11/56 (2018.01); F24F 11/63 (2018.01); F24F 11/64 (2018.01); F27D 21/04 (2013.01); G05B 13/028 (2013.01); G10L 25/51 (2013.01); F27D 2019/0009 (2013.01); F27D 2019/0084 (2013.01); F27D 2021/0057 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A Heating, Ventilation, and Air Conditioning (HVAC) analysis system, comprising:
a combustion air inducer configured to provide combustion air to an HVAC system;
an integrated furnace controller configured to control the operation of the combustion air inducer;
a microphone configured to capture an audio signal of the combustion air inducer; and
an analysis device operably coupled to the microphone, comprising:
a memory operable to store an audio signature library comprising a plurality of audio signatures, wherein:
each audio signature identifies one or more attributes for a portion of an audio signal;
each audio signature is associated with a fault type for the HVAC system; and
each fault type is associated with a component identifier for a component of the HVAC system; and
a processor operably coupled to the memory, configured to:
operate the HVAC system, wherein operating the HVAC system comprises sending a command to initiate a heat cycle;
determine a speed of the combustion air inducer;
determine that the speed of the combustion air inducer exceeds a first speed threshold value;
in response to determining that the speed of the combustion air inducer exceeds the first speed threshold value, activate the microphone to capture a first audio signal;
receive the first audio signal from the microphone while operating the HVAC system;
determine that the speed of the combustion air inducer exceeds a second speed threshold value, wherein the second speed threshold is greater than the first speed threshold value;
in response to determining that the speed of the combustion air inducer exceeds the second speed threshold value, determine a first audio signature from the plurality of audio signatures of the audio signature library for the combustion air inducer is not present within the first audio signal;
determine whether a second audio signature from the plurality of audio signatures of the audio signature library for the integrated furnace controller is present within the first audio signal;
determine a fault type based on the determination of whether the second audio signature for the integrated furnace controller is present within the first audio signal;
identify a first component identifier for a first component of the HVAC system that is associated with the fault type; and
output a recommendation identifying the first component identifier.