US 12,377,713 B2
Electric compressor control device, electric compressor, and electric compressor control method
Kyohei Watanabe, Tokyo (JP); Akinori Yoshioka, Tokyo (JP); Makoto Takeuchi, Tokyo (JP); Tomoki Hase, Tokyo (JP); Takashi Mitsumata, Tokyo (JP); and Shinya Hamamoto, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD., Tokyo (JP)
Appl. No. 18/283,680
Filed by MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD., Tokyo (JP)
PCT Filed May 12, 2022, PCT No. PCT/JP2022/020074
§ 371(c)(1), (2) Date Sep. 22, 2023,
PCT Pub. No. WO2022/239836, PCT Pub. Date Nov. 17, 2022.
Claims priority of application No. 2021-080872 (JP), filed on May 12, 2021.
Prior Publication US 2024/0166024 A1, May 23, 2024
Int. Cl. B60H 1/32 (2006.01); H02P 29/024 (2016.01)
CPC B60H 1/3205 (2013.01) [H02P 29/026 (2013.01); B60H 2001/3238 (2013.01); B60H 2001/3292 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An electric compressor control device comprising:
a control unit of an inverter that controls a motor that drives a compressor;
a physical quantity calculation unit that calculates a physical quantity that changes according to a workload of the compressor based on one or a plurality of predetermined detection values obtained from the inverter;
a rotation speed acquisition unit that acquires a rotation speed of the motor;
a storage unit that stores:
information representing a first threshold value that changes according to the rotation speed of the motor and defines whether or not the physical quantity is a normal value; and
information representing a second threshold value that changes according to the rotation speed of the motor and defines whether the physical quantity is a slight abnormality or severe abnormality in a case where the physical quantity is not normal; and
a refrigerant abnormality determination unit that determines whether or not there is an abnormality in a refrigerant system by comparing the calculated physical quantity with the first threshold value according to the acquired rotation speed, wherein
the refrigerant abnormality determination unit determines whether the refrigerant system is in a normality, slight abnormality, or severe abnormality by comparing the calculated physical quantity with the first threshold value and the second threshold value according to the acquired rotation speed, and
in a case where determination is made to be the severe abnormality, the refrigerant abnormality determination unit determines that operation is not continuable when a time from the determination to be the slight abnormality to the determination to be the severe abnormality is shorter than a first time.