US 11,852,132 B2
Compressor cylinder switching control method and device, unit and air conditioning system
Hua Liu, Guangdong (CN); Ke Xu, Guangdong (CN); Qunbo Liu, Guangdong (CN); Longfei Li, Guangdong (CN); and Yaopeng Rong, Guangdong (CN)
Assigned to Gree Electric Appliances, Inc. of Zhuhai, Guangdong (CN)
Appl. No. 17/259,578
Filed by Gree Electric Appliances, Inc. of Zhuhai, Guangdong (CN)
PCT Filed Dec. 19, 2018, PCT No. PCT/CN2018/121884
§ 371(c)(1), (2) Date Jan. 12, 2021,
PCT Pub. No. WO2020/034516, PCT Pub. Date Feb. 20, 2020.
Claims priority of application No. 201810941575.1 (CN), filed on Aug. 17, 2018.
Prior Publication US 2021/0270260 A1, Sep. 2, 2021
Int. Cl. F04B 49/06 (2006.01); F04B 27/00 (2006.01); F04B 49/02 (2006.01); F04C 23/00 (2006.01); F04C 28/08 (2006.01); F04C 28/02 (2006.01)
CPC F04B 49/065 (2013.01) [F04B 27/005 (2013.01); F04B 49/02 (2013.01); F04C 23/001 (2013.01); F04C 28/02 (2013.01); F04C 28/08 (2013.01); F04B 2203/0204 (2013.01); F04B 2205/07 (2013.01); F04B 2207/03 (2013.01); F04B 2207/703 (2013.01); F04C 2270/075 (2013.01); F04C 2270/095 (2013.01)] 20 Claims
OG exemplary drawing
 
20. An air conditioning unit comprising: a main controller, a compressor and a driving controller of the compressor;
the main controller is used for determining whether the compressor needs to perform cylinder switching; if so, controlling the driving controller to adjust current operating frequency according to a system pressure difference so that both the adjusted operating frequency and the system pressure difference meet a cylinder switching condition of the compressor; and sending a cylinder switching command to the driving controller;
the driving controller is respectively connected with the main controller and the compressor, and is used for controlling the compressor to perform cylinder switching according to the cylinder switching command;
wherein, the adjusting a current operating frequency according to a system pressure difference, comprises:
determining a target operating frequency according to the system pressure difference; and
adjusting the current operating frequency to the target operating frequency;
wherein, determining whether the compressor needs to perform cylinder switching comprises:
determining that the compressor needs to be switched from a single-cylinder operation to a double-cylinder operation; and
determining the target operating frequency according to the system pressure difference comprises:
if Pc−Pe>d, determining the target operating frequency f=e; or
if Pc−Pe≤d, determining the target operation frequency f according to the current operation frequency F;
if Pc−Pe≤d, determining the target operating frequency f according to the current operating frequency F, comprising:
if F>e, determining f=e; or
if F<e−p, determining f=e−p; or
if F∈[e−p, e], determining f=F;
wherein Pc is a system high pressure, Pe is a system low pressure, Pc−Pe is the system pressure difference, F is the current operating frequency of the compressor, f is the target operating frequency of the compressor, and d, e and p are preset values.