US 12,146,692 B2
Control method and control system
Xin Yuan, Zhejiang (CN)
Assigned to HANGZHOU SANHUA RESEARCH INSTITUTE CO., LTD., Zhejiang (CN)
Appl. No. 17/782,808
Filed by HANGZHOU SANHUA RESEARCH INSTITUTE CO., LTD., Zhejiang (CN)
PCT Filed Dec. 7, 2020, PCT No. PCT/CN2020/134227
§ 371(c)(1), (2) Date Jun. 6, 2022,
PCT Pub. No. WO2021/115222, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 201911247970.0 (CN), filed on Dec. 9, 2019.
Prior Publication US 2023/0011731 A1, Jan. 12, 2023
Int. Cl. F25B 41/31 (2021.01); F25B 49/02 (2006.01); G05B 15/02 (2006.01)
CPC F25B 41/31 (2021.01) [F25B 49/02 (2013.01); G05B 15/02 (2013.01); F25B 2600/2513 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A control method, for controlling an electronic expansion valve that comprises a controller, comprising:
obtaining a temperature signal at an outlet of the electronic expansion valve by using a temperature detector of the controller, and obtaining a pressure signal at the outlet of the electronic expansion valve by using a pressure detector of the controller;
using, by the controller, the temperature signal at the outlet of the electronic expansion valve and the pressure signal at the outlet of the electronic expansion valve as all or a part of an input signal, and determining, by the controller, a first current superheat, wherein the first current superheat is a difference between a superheat temperature a saturation temperature of a refrigerant under a same evaporation pressure in a refrigeration cycle, there is a correspondence relationship between saturation temperatures and evaporation pressures, and the saturation temperature is obtained based on the evaporation pressure; and
controlling, by the controller according to a requirement from an upper computer or a predetermined condition, the electronic expansion valve to operate in one of a temperature control mode, a superheat control mode and an opening control mode;
wherein in the opening control mode, the upper computer transmits a target position to the electronic expansion valve based on the temperature signal at the outlet of the electronic expansion valve and the pressure signal at the outlet of the electronic expansion valve, and the electronic expansion valve operates to a target opening based on the target position.