System and method for controlling an air conditioning system and an outdoor apparatus of the system

Patent metadata

Field	Value
Publication number	US-9797642-B2
Application number	US-201414471556-A
Country	US
Kind code	B2
Filing date	Aug 28, 2014
Priority date	Jan 21, 2014
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

A method for controlling an air conditioning system, an outdoor apparatus of an air conditioning system and an air conditioning system are provided. The method includes: obtaining a working mode of the air conditioning system and starting a variable-frequency compressor in an outdoor apparatus of the air conditioning system according to the working mode; obtaining a target refrigerant saturation temperature; performing a variable-frequency control on the variable-frequency compressor according to the target refrigerant saturation temperature; during the variable-frequency control, obtaining a working time of the variable-frequency compressor and a stop-start number of time of the variable-frequency compressor in a first predetermined period; and adjusting the target refrigerant saturation temperature according to the working time of the variable-frequency compressor and the stop-start number of time of the variable-frequency compressor in the first predetermined time.

First claim

What is claimed is:

1. A method for controlling an air conditioning system, comprising:
obtaining a working mode of the air conditioning system and starting a variable-frequency compressor in an outdoor apparatus of the air conditioning system according to the working mode;
obtaining a target refrigerant saturation temperature;
performing a variable-frequency control on the variable-frequency compressor according to the target refrigerant saturation temperature;
during the variable-frequency control, obtaining a working time of the variable-frequency compressor and a stop-start number of time of the variable-frequency compressor in a first predetermined period; and
adjusting the target refrigerant saturation temperature according to the working time of the variable-frequency compressor and the stop-start number of time of the variable-frequency compressor in the first predetermined time.

2. The method according to claim 1 , wherein obtaining a working mode of the air conditioning system comprises receiving an on-off instruction and a mode option instruction sent from a remote, a line controller or an indoor apparatus of the air conditioning system via a communicator in the outdoor apparatus.

3. The method according to claim 1 , further comprising:
setting an adjusted target refrigerant saturation temperature as the refrigerant saturation temperature of the outdoor apparatus in a next start, when the outdoor apparatus is stopped.

4. The method according to claim 1 , wherein adjusting the target refrigerant saturation temperature according to the working time of the variable-frequency compressor and the stop-start number of time of the variable-frequency compressor in the first predetermined time comprises:
determining whether the working time of the variable-frequency compressor is larger than or equal to a first time threshold;
if yes, obtaining the stop-start number of time of the variable-frequency compressor in the first predetermined period; and
if the stop-start number of time of the variable-frequency compressor in the first predetermined period is larger than or equal to a first predetermined number of time threshold, adjusting the target refrigerant saturation temperature according to a predetermined step length.

5. The method according to claim 4 , wherein
when the working mode is a heating mode, the target refrigerant saturation temperature is reduced by the predetermined step length and the working time of the variable-frequency compressor returns to zero;
when the working mode is a refrigerating mode, the target refrigerant saturation temperature is increased by the predetermined step length and the working time of the variable-frequency compressor returns to zero.

6. The method according to claim 1 , wherein obtaining a target refrigerant saturation temperature comprises:
detecting a current ambient temperature of the outdoor apparatus, when the outdoor apparatus is started for a first time in a predetermined working cycle; and
determining the target refrigerant saturation temperature according to the current ambient temperature of the outdoor apparatus.

7. The method according to claim 1 , wherein a first pressure detecting signal is detected via a first pressure sensor disposed at an inlet of the variable-frequency compressor, when the working mode is a refrigerating mode.

8. The method according to claim 1 , wherein a second pressure detecting signal is detected via a second pressure sensor disposed at an outlet of the variable-frequency compressor, when the working mode is a heating mode.

9. The method according to claim 8 , wherein performing a variable-frequency control on the variable-frequency compressor according to the target refrigerant saturation temperature comprises:
generating a current refrigerant saturation temperature by selecting one of the first pressure detecting signal and the second pressure detecting signal according to the working mode; and
performing the variable-frequency control on the variable-frequency compressor according to the target refrigerant saturation temperature and the current refrigerant saturation temperature.

10. The method according to 2 , further comprising:
controlling the outdoor apparatus to delay a second predetermined period to start or stop after receiving the on-off instruction.

11. An outdoor apparatus of an air conditioning system, comprising:
a variable-frequency compressor;
a controller configured to control the variable-frequency compressor and comprising:
a start module configured to obtain a working mode of the air conditioning system and to start the variable-frequency compressor according to the working mode of the air condition;
a temperature control module configured to obtain a target refrigerant saturation temperature, to obtain a working time of the variable-frequency compressor and a stop-start number of time of the variable-frequency compressor in a first predetermined period during an variable-frequency control for the variable-frequency compressor, and to adjust the target refrigerant saturation temperature according to the working time of the variable-frequency compressor and the stop-start number of time of the variable-frequency compressor in the first predetermined period; and

a variable-frequency control module configured to perform the variable-frequency control on the variable-frequency compressor according to the target refrigerant saturation temperature.

12. The outdoor apparatus of an air conditioning system according to claim 11 , wherein the temperature control module is further configured to set an adjusted target refrigerant saturation temperature as the refrigerant saturation temperature of the outdoor apparatus in a next start, when the outdoor apparatus is stopped.

13. The outdoor apparatus of an air conditioning system according to claim 11 , wherein the temperature control module is further configured to adjust the target refrigerant saturation temperature according to a predetermined step length, when the working time of the variable-frequency compressor is larger than or equal to a first time threshold and the stop-start number of time of the variable-frequency compressor in the first predetermined period is larger than or equal to a first predetermined number of time threshold.

14. The outdoor apparatus of an air conditioning system according to claim 13 , wherein
when the working mode is a heating mode, the temperature control module reduces the target refrigerant saturation temperature by the predetermined step length and returns the working time of the variable-frequency compressor to zero;
when the working mode is a refrigerating mode, the temperature control module increases the target refrigerant saturation temperature by the predetermined step length and returns the working time of the variable-frequency compressor to zero.

15. The outdoor apparatus of an air conditioning system according to claim 11 , further comprising:
a temperature sensor configured to detect a current ambient temperature of the outdoor apparatus, wherein the temperature control module determines the target refrigerant saturation temperature according to the current ambient temperature of the outdoor apparatus, when the outdoor apparatus is started for the first time in a predetermined working cycle.

16. The outdoor apparatus of an air conditioning system according to claim 11 , further comprising:
a first pressure sensor disposed at an inlet of the variable-frequency compressor and configured to detect a first pressure detecting signal, when the working mode is a refrigerating mode.

Assignees

• Gd Midea Heating & Ventilating Equipment Co Ltd
• Midea Group Co Ltd
• Gd Midea Heating & Ventilating Equipment Co Ltd

Inventors

• Luo Bin
• Wei Fudang

Classifications

• F25B2600/0253

  with variable speed · CPC title

• F25B13/00

  Compression machines, plants or systems, with reversible cycle (defrosting cycles F25B47/02) · CPC title

• F25B2313/0294

  related to the outdoor fan, e.g. controlling speed · CPC title

• F25B2700/1933

  Suction pressures · CPC title

• F25B2700/1931

  Discharge pressures · CPC title