US 12,000,604 B2
Failure diagnosis system configured to diagnose a state of an air-conditioning apparatus having a refrigerant circuit
Takehiro Koyano, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 17/040,657
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed May 14, 2018, PCT No. PCT/JP2018/018554
§ 371(c)(1), (2) Date Sep. 23, 2020,
PCT Pub. No. WO2019/220507, PCT Pub. Date Nov. 21, 2019.
Prior Publication US 2021/0018203 A1, Jan. 21, 2021
Int. Cl. F24F 11/38 (2018.01); F24F 11/62 (2018.01); F25B 49/02 (2006.01)
CPC F24F 11/38 (2018.01) [F24F 11/62 (2018.01); F25B 49/022 (2013.01); F25B 49/027 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A failure diagnosis system configured to diagnose a state of an air-conditioning apparatus having a refrigerant circuit in which refrigerant circulates, the failure diagnosis system comprising:
a state detection sensor configured to detect a state of the refrigerant in the refrigerant circuit as state data;
a controller configured to control an actuator of the air-conditioning apparatus;
a processor, and
the processor being configured to perform normal-operation abnormality diagnosis determining presence or absence of abnormality of the air-conditioning apparatus by using
the state data, and
control data indicating a content of control by the controller during a normal operation of the air-conditioning apparatus,
the processor being configured to,
when determining that abnormality is present in the air-conditioning apparatus,
change a control value of the actuator of the air-conditioning apparatus,
acquire the state data and the control data, and
perform abnormality-cause identification diagnosis identifying a cause of an abnormality of the air-conditioning apparatus by using
the state data and the control data that are acquired before the change of the control value of the actuator, and
the state data and the control data that are acquired after the change of the control value of the actuator,
wherein the processor is configured to
obtain refrigerant state information, indicating the state of the refrigerant at a specific location of the refrigerant circuit, by using the state data and the control data in the normal-operation abnormality diagnosis, and
obtain the refrigerant state information by using the state data and the control data after the change of the control value of the actuator and compare the obtained refrigerant state information with the refrigerant state information obtained in the normal-operation abnormality diagnosis to identify the cause of the abnormality in the air-conditioning apparatus in the abnormality-cause identification diagnosis,
wherein the processor is configured to cause a management apparatus to display the refrigerant state information obtained in the normal-operation abnormality diagnosis and the refrigerant state information acquired after the change of the control value of the actuator, the management apparatus being configured to manage the air-conditioning apparatus.