US 11,994,325 B2
Control device, refrigerator, control method, and abnormality detection method
Ryosuke Suemitsu, Tokyo (JP); Akimasa Yokoyama, Tokyo (JP); Takahiro Kono, Tokyo (JP); and Yasushi Hasegawa, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD., Tokyo (JP)
Appl. No. 17/266,012
Filed by MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD., Tokyo (JP)
PCT Filed Jun. 18, 2019, PCT No. PCT/JP2019/024025
§ 371(c)(1), (2) Date Feb. 4, 2021,
PCT Pub. No. WO2020/035993, PCT Pub. Date Feb. 20, 2020.
Claims priority of application No. 2018-152256 (JP), filed on Aug. 13, 2018.
Prior Publication US 2021/0302084 A1, Sep. 30, 2021
Int. Cl. F25B 49/02 (2006.01); F04D 27/00 (2006.01); F25B 41/20 (2021.01); F25B 41/31 (2021.01)
CPC F25B 49/02 (2013.01) [F04D 27/001 (2013.01); F25B 41/20 (2021.01); F25B 41/31 (2021.01); F25B 2400/0403 (2013.01); F25B 2400/06 (2013.01); F25B 2500/06 (2013.01); F25B 2600/2501 (2013.01); F25B 2600/2513 (2013.01); F25B 2700/151 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A controller for a refrigerator provided with a plurality of compressors connected in parallel,
wherein the controller detects occurrence of surging and occurrence of droplet suction, while distinguishing the surging from the droplet suction, on the basis of a deviation between values of currents flowing through electric motors that are configured to drive each of the plurality of compressors, and an operation point indicated by an air volume and a compression ratio of the plurality of compressors.