A control method of an air conditioning unit and an air conditioning unit

Abstract

The application discloses a control method of an air conditioning unit and the air conditioning unit. The control method comprises the following steps: when the air conditioning unit starts to execute a heating mode, a control device acquires an outdoor environment temperature T E0 fed back by an environment temperature sensor and an inlet water temperature T W0 fed back by an inlet water temperature sensor of the air conditioning unit; a maximum opening degree value P MAX of an electronic expansion valve is confirmed according to T E0 and T W0 ; a target supercooling degree M GL of the air conditioning unit is set according to T E0 and T W0 ; an initial opening degree P1 of the electronic expansion valve is calculated according to T E0 , T W0 and P MAX , and the opening degree of the electronic expansion valve is adjusted to P1. According to the control method, the upper limit value of the initial opening degree of the electronic expansion valve when the valve is closed can be improved, the probability that the defrosting temperature sensor of the air conditioning unit is out of range can be reduced, the difference between the actual supercooling degree of the air conditioning unit and the target supercooling degree can be reduced by adjusting the target supercooling degree of the air conditioning unit, and the possibility that the defrosting temperature sensor of the air conditioning unit is out of range can be further reduced.

Description

Technical Field

[0001] This invention relates to the field of heating, ventilation and air conditioning technology, and in particular to a control method for an air conditioning unit and an air conditioning unit. Background Technology

[0002] When existing air conditioning units are in operation, the fins of the outdoor unit may frost over when the ambient temperature is below -25℃. When the frost is severe, the evaporation temperature of the fins will continue to decrease. The defrost temperature sensor is generally a negative temperature coefficient thermistor, meaning that the real-time temperature change trend detected by the defrost temperature sensor is the same as the evaporation temperature change trend. As the frost on the fins becomes more and more severe, the defrost temperature sensor is prone to exceeding the measurement range, causing the air conditioning unit to malfunction and shut down.

[0003] To avoid abnormal shutdowns caused by defrost temperature sensors operating outside their range, existing air conditioning units generally employ a method of widening the temperature sensor's detection range. However, if the widened range is not properly implemented, it can easily damage the air conditioning unit, causing the compressor to operate outside its reasonable range. Furthermore, widening the detection range of the defrost temperature sensor can only reduce the number of fault alarms from the air conditioning unit, but it cannot fundamentally protect the air conditioning unit.

[0004] It is evident that existing technologies still need improvement and enhancement. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a control method for air conditioning units that can greatly reduce the probability of the defrosting temperature sensor of the air conditioning unit going out of range.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A control method for an air conditioning unit, the air conditioning unit comprising a control device and an electronic expansion valve, an ambient temperature sensor, and an inlet water temperature sensor, all electrically connected to the control device; the control method includes the following steps: When the air conditioning unit starts operating in heating mode, the control device obtains the outdoor ambient temperature from the ambient temperature sensor. And the inlet water temperature of the air conditioning unit as fed back by the inlet water temperature sensor. ; according to and Confirm the maximum opening value of the electronic expansion valve and according to and Set the target subcooling level for the air conditioning unit ; according to , and Calculate the initial opening of the electronic expansion valve. And adjust the opening of the electronic expansion valve to .

[0007] The control method for the air conditioning unit further includes a condensing temperature sensor and an outlet temperature sensor, which are electrically connected to the control device, respectively. The control method also includes the following steps: The control device acquires the real-time condensing temperature from the condensing temperature sensor. And the real-time temperature at the condenser's main outlet, fed back by the outlet temperature sensor. ; according to and Calculate the current subcooling of the air conditioning unit ; Based on the current supercooling and target supercooling Calculate the difference in subcooling ; Based on the difference in supercooling Confirm the adjustment setting of the electronic expansion valve, and adjust the working state of the electronic expansion valve according to the determined adjustment setting.

[0008] In the control method of the air conditioning unit, the step of... and Confirm the maximum opening value of the electronic expansion valve Specifically: When -30℃ < ≤-20℃ and 25℃≤ When <40℃, or when -20℃ < ≤-10℃ and 40℃≤ When <55℃, or when -10℃ < ≤-5℃ and 55℃≤ When <70℃, or when -10℃ < ≤-5℃ and 55℃≤ When <70℃, or when -5℃ < ≤5℃ and 55℃≤ When <70℃, or when -5℃ < ≤5℃ and 70℃≤ Maximum opening value of electronic expansion valve at ≤80℃ It is 465; When -30℃ < ≤-20℃ and 40℃≤ When <55℃, or when -20℃ < ≤-10℃ and 55℃≤ When <70℃, or when -10℃ < ≤-5℃ and 70℃≤ Maximum opening value of electronic expansion valve at ≤80℃ It is 460; When -20℃ < ≤-10℃ and 25℃≤ When <40℃, or when -10℃ < ≤-5℃ and 25℃≤ When <40℃, or when -10℃ < ≤-5℃ and 40℃≤ When <55℃, or when -5℃ < ≤5℃ and 40℃≤ When <55℃, or when 5℃ < ≤15℃ and 55℃≤ When <70℃, or when 5℃ < ≤15℃ and 70℃≤ Maximum opening value of electronic expansion valve at ≤80℃ It is 470; When -5℃ < ≤5℃ and 25℃≤ When <40℃, or when 5℃ < ≤15℃ and 25℃≤ When <40℃, or when 5℃ < ≤15℃ and 40℃≤ Maximum opening value of electronic expansion valve at <55℃ It is 460.

[0009] In the control method of the air conditioning unit, the step of... and Set the target subcooling level for the air conditioning unit Specifically: When -30℃ < ≤-20℃ and 25℃≤ When the temperature is <40℃, set the target subcooling degree of the air conditioning unit. It is 4; When -20℃ < ≤-10℃ and 25℃≤ When the temperature is <40℃, set the target subcooling degree of the air conditioning unit. It is 5; When -30℃ < ≤-20℃ and 40℃≤ When <55℃, or when -10℃ < ≤-5℃ and 25℃≤ When the temperature is below 40℃, set the target subcooling degree for the air conditioning unit. It is 7; When -5℃ < ≤5℃ and 25℃≤ When <40℃, or when 5℃ < ≤15℃ and 25℃≤ When <40℃, or when -20℃ < ≤-10℃ and 40℃≤ When the temperature is below 55℃, set the target subcooling degree for the air conditioning unit. It is 8; When -10℃ < ≤-5℃ and 40℃≤ When the temperature is below 55℃, set the target subcooling degree for the air conditioning unit. It is 9; When -20℃ < ≤-10℃ and 55℃≤ When <70℃, or when -10℃ < ≤-5℃ and 55℃≤ When <70℃, or when -5℃ < ≤5℃ and 40℃≤ When the temperature is below 55℃, set the target subcooling degree for the air conditioning unit. It is 10; When -10℃ < ≤-5℃ and 70℃≤ When ≤80℃, or when -5℃ < ≤5℃ and 55℃≤ When the temperature is <70℃, set the target subcooling degree of the air conditioning unit. It is 11; When -5℃ < ≤5℃ and 70℃≤ When ≤80℃, or when 5℃ < ≤15℃ and 40℃≤ When <55℃, or when 5℃ < ≤15℃ and 55℃≤ When <70℃, or when 5℃ < ≤15℃ and 70℃≤ When the temperature is ≤80℃, set the target subcooling degree of the air conditioning unit. It is 12.

[0010] In the control method of the air conditioning unit, the step of... , and Calculate the initial opening of the electronic expansion valve. Specifically: = ( -100) / 2+2 - .

[0011] In the control method of the air conditioning unit, the step of... and Calculate the current subcooling of the air conditioning unit Specifically: = - .

[0012] In the control method of the air conditioning unit, the step of adjusting the current subcooling degree... and target supercooling Calculate the difference in subcooling Specifically: = - .

[0013] In the control method of the air conditioning unit, the step of using the subcooling difference... Confirm the adjustment setting of the electronic expansion valve, specifically: The adjustment range includes adjustment opening and adjustment time. The adjustment range includes seven levels, with the adjustment opening gradually increasing from level one to level seven. When the difference in supercooling When the value is ≤-6, the adjustment position of the electronic expansion valve is set to level one; When -6 < When the value is ≤-5, the adjustment position of the electronic expansion valve is two. When -5 < When the temperature is ≤-4, the electronic expansion valve has three adjustment positions. When -4 < When the value is ≤5, the electronic expansion valve has four adjustment positions. When 5 < When the value is ≤6, the electronic expansion valve has five adjustment positions. When 6 < When the temperature is ≤7, the electronic expansion valve has six adjustment positions. When 7 < At that time, the electronic expansion valve has seven adjustment levels.

[0014] In the control method of the air conditioning unit, the step of using the subcooling difference... Confirm the adjustment setting of the electronic expansion valve, specifically: The adjustment range includes adjusting the opening degree and adjusting the time, and the adjustment range includes one to seven levels; When the difference in supercooling When the value is ≤-6, the control device controls the electronic expansion valve to decrease by 6P within 20 seconds; When -6 < When the value is ≤-5, the control device controls the electronic expansion valve to decrease by 4P within 40 seconds; When -5 < When the value is ≤-4, the control device controls the electronic expansion valve to decrease by 2P within 60 seconds; When -4 < When the value is ≤5, the control device controls the electronic expansion valve to maintain its original opening for 130 seconds; When 5 < When the value is ≤6, the control device controls the electronic expansion valve to increase by 2P within 60 seconds; When 6 < When the value is ≤7, the control device controls the electronic expansion valve to increase by 4P within 40 seconds; When 7 < At that time, the control device controls the electronic expansion valve to increase by 6P within 20 seconds.

[0015] The present invention also provides an air conditioning unit, which includes a control device and an electronic expansion valve, an ambient temperature sensor, an inlet water temperature sensor, a condenser temperature sensor, and an outlet temperature sensor, all electrically connected to the control device. The control device uses any of the control methods described above to control the operation of the air conditioning unit. The ambient temperature sensor is used to acquire the outdoor ambient temperature, the inlet water temperature sensor is used to acquire the inlet water temperature of the air conditioning unit, the condenser temperature sensor is used to acquire the condenser temperature of the air conditioning unit, and the outlet temperature sensor is used to acquire the temperature at the total outlet of the condenser. The electronic expansion valve is located on the refrigeration pipeline connected to the compressor.

[0016] Beneficial effects: This invention provides a control method for an air conditioning unit. By adjusting the initial opening of the electronic expansion valve, the initial opening value of the electronic expansion valve of the air conditioning unit can be amplified, increasing the upper limit of the starting opening when the electronic expansion valve closes. This prevents the electronic expansion valve from closing too small an opening, reducing the probability of the defrost temperature sensor of the air conditioning unit malfunctioning out of range. Furthermore, by adjusting the target subcooling degree of the air conditioning unit, the difference between the actual subcooling degree and the target subcooling degree can be reduced, preventing the electronic expansion valve from always being in the closed position range, and also preventing the electronic expansion valve from always being in the excessively large closed position range, further reducing the possibility of the defrost temperature sensor of the air conditioning unit malfunctioning out of range. Attached Figure Description

[0017] Figure 1 A first logic flowchart of the control method provided by the present invention; Figure 2 The second logic flowchart of the control method provided by the present invention. Detailed Implementation

[0018] This invention provides a control method for an air conditioning unit and an air conditioning unit. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] In the description of this invention, it should be understood that the terms "installation" and "connection" should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] Please see Figure 1 and Figure 2 This invention provides a control method for an air conditioning unit, the air conditioning unit including a control device and an electronic expansion valve, an ambient temperature sensor, and an inlet water temperature sensor, all electrically connected to the control device; the control method includes the following steps: 101. When the air conditioning unit starts operating in heating mode, the control device obtains the outdoor ambient temperature from the ambient temperature sensor. And the inlet water temperature of the air conditioning unit as fed back by the inlet water temperature sensor. ; In this embodiment, the and The real-time ambient temperature is fed back by the ambient temperature sensor, and the real-time inlet water temperature of the air conditioning unit is fed back by the water temperature sensor, indicating when the air conditioning unit starts to operate in heating mode.

[0021] 102. According to and Confirm the maximum opening value of the electronic expansion valve and according to and Set the target subcooling level for the air conditioning unit ; In this embodiment, These represent the maximum opening value of the electronic expansion valve under different operating conditions. It is related to the outdoor ambient temperature and the inlet water temperature of the air conditioning unit.

[0022] 103. According to , and Calculate the initial opening of the electronic expansion valve. And adjust the opening of the electronic expansion valve to ; In this embodiment, = ( -100) / 2+2 - The initial opening and the maximum opening value The units are all P.

[0023] In this embodiment, by adjusting the initial opening of the electronic expansion valve, the initial opening value of the electronic expansion valve of the air conditioning unit can be amplified, increasing the upper limit of the starting opening when the electronic expansion valve closes. This prevents the electronic expansion valve from closing too small an opening, reducing the probability of the defrost temperature sensor of the air conditioning unit malfunctioning out of range. Furthermore, by adjusting the target subcooling of the air conditioning unit, the difference between the actual subcooling and the target subcooling can be reduced, preventing the electronic expansion valve from always being in the closed position range, and also preventing it from always being in the excessively large closed position range, further reducing the possibility of the defrost temperature sensor of the air conditioning unit malfunctioning out of range. The detection range of the defrost temperature sensor is reasonably and appropriately widened, leaving more lower limit margin for the reliability of the air conditioning unit, ensuring normal and reasonable operation of the air conditioning unit under ultra-low temperature conditions, and improving the reliability of the air conditioning unit during operation.

[0024] Further, please refer to Figure 2 The air conditioning unit further includes a condensing temperature sensor and an outlet temperature sensor, which are electrically connected to the control device respectively, and the control method further includes the following steps: 201. The control device acquires the real-time condensing temperature fed back by the condensing temperature sensor. And the real-time temperature at the condenser's main outlet, fed back by the outlet temperature sensor. ; In this embodiment, after the initial opening of the electronic expansion valve is adjusted, the real-time condensing temperature fed back by the condensing temperature sensor is acquired during the heating mode operation of the air conditioning unit. And the real-time temperature at the condenser's main outlet, fed back by the outlet temperature sensor. .

[0025] 202. According to and Calculate the current subcooling of the air conditioning unit ; In this embodiment, = - The current subcooling The unit is ℃.

[0026] 203. Based on the current subcooling and target supercooling Calculate the difference in subcooling ; In this embodiment, = - The target supercooling The unit is ℃, and the supercooling difference is... The unit is ℃.

[0027] 204. Based on the difference in subcooling Confirm the adjustment setting of the electronic expansion valve, and adjust the working state of the electronic expansion valve according to the determined adjustment setting.

[0028] In this embodiment, the adjustment setting is determined based on the subcooling difference to adjust the closing rate and closing time of the electronic expansion valve, preventing the electronic expansion valve from closing too quickly, thereby avoiding the final opening of the electronic expansion valve becoming smaller, and further reducing the possibility of the defrosting temperature sensor of the air conditioning unit being out of range.

[0029] Further, please refer to Table 1, which states that... and Confirm the maximum opening value of the electronic expansion valve Specifically: When -30℃ < ≤-20℃ and 25℃≤ When <40℃, or when -20℃ < ≤-10℃ and 40℃≤ When <55℃, or when -10℃ < ≤-5℃ and 55℃≤ When <70℃, or when -10℃ < ≤-5℃ and 55℃≤ When <70℃, or when -5℃ < ≤5℃ and 55℃≤ When <70℃, or when -5℃ < ≤5℃ and 70℃≤ Maximum opening value of electronic expansion valve at ≤80℃ It is 465; When -30℃ < ≤-20℃ and 40℃≤ When <55℃, or when -20℃ < ≤-10℃ and 55℃≤ When <70℃, or when -10℃ < ≤-5℃ and 70℃≤ Maximum opening value of electronic expansion valve at ≤80℃ It is 460; When -20℃ < ≤-10℃ and 25℃≤ When <40℃, or when -10℃ < ≤-5℃ and 25℃≤ When <40℃, or when -10℃ < ≤-5℃ and 40℃≤ When <55℃, or when -5℃ < ≤5℃ and 40℃≤ When <55℃, or when 5℃ < ≤15℃ and 55℃≤ When <70℃, or when 5℃ < ≤15℃ and 70℃≤ Maximum opening value of electronic expansion valve at ≤80℃ It is 470; When -5℃ < ≤5℃ and 25℃≤ When <40℃, or when 5℃ < ≤15℃ and 25℃≤ When <40℃, or when 5℃ < ≤15℃ and 40℃≤ Maximum opening value of electronic expansion valve at <55℃ It is 460.

[0030] Table 1 , and Relationship table

[0031] Further, please refer to Table 2, which states and is based on and Set the target subcooling level for the air conditioning unit Specifically: When -30℃ < ≤-20℃ and 25℃≤ When the temperature is <40℃, set the target subcooling degree of the air conditioning unit. It is 4; When -20℃ < ≤-10℃ and 25℃≤ When the temperature is <40℃, set the target subcooling degree of the air conditioning unit. It is 5; When -30℃ < ≤-20℃ and 40℃≤ When <55℃, or when -10℃ < ≤-5℃ and 25℃≤ When the temperature is <40℃, set the target subcooling degree of the air conditioning unit. It is 7; When -5℃ < ≤5℃ and 25℃≤ When <40℃, or when 5℃ < ≤15℃ and 25℃≤ When <40℃, or when -20℃ < ≤-10℃ and 40℃≤ When the temperature is below 55℃, set the target subcooling degree for the air conditioning unit. It is 8; When -10℃ < ≤-5℃ and 40℃≤ When the temperature is below 55℃, set the target subcooling degree for the air conditioning unit. It is 9; When -20℃ < ≤-10℃ and 55℃≤ When <70℃, or when -10℃ < ≤-5℃ and 55℃≤ When <70℃, or when -5℃ < ≤5℃ and 40℃≤ When the temperature is below 55℃, set the target subcooling degree for the air conditioning unit. It is 10; When -10℃ < ≤-5℃ and 70℃≤ When ≤80℃, or when -5℃ < ≤5℃ and 55℃≤ When the temperature is <70℃, set the target subcooling degree of the air conditioning unit. It is 11; When -5℃ < ≤5℃ and 70℃≤ When ≤80℃, or when 5℃ < ≤15℃ and 40℃≤ When <55℃, or when 5℃ < ≤15℃ and 55℃≤ When <70℃, or when 5℃ < ≤15℃ and 70℃≤ When the temperature is ≤80℃, set the target subcooling degree of the air conditioning unit. It is 12.

[0032] Table 2 , and Relationship table

[0033] Further, please refer to Table 3, which states that the difference in subcooling is used to determine the specific conditions. Confirm the adjustment setting of the electronic expansion valve, specifically: The adjustment range includes adjustment opening and adjustment time. The adjustment range includes seven levels, with the adjustment opening gradually increasing from level one to level seven. When the difference in supercooling When the value is ≤-6, the adjustment position of the electronic expansion valve is set to level one; When -6 < When the value is ≤-5, the adjustment position of the electronic expansion valve is two. When -5 < When the temperature is ≤-4, the electronic expansion valve has three adjustment positions. When -4 < When the value is ≤5, the electronic expansion valve has four adjustment positions. When 5 < When the value is ≤6, the electronic expansion valve has five adjustment positions. When 6 < When the temperature is ≤7, the electronic expansion valve has six adjustment positions. When 7 < At that time, the electronic expansion valve has seven adjustment levels.

[0034] Further, please refer to Table 3, which states that the difference in subcooling is used to determine the specific conditions. Confirm the adjustment setting of the electronic expansion valve, specifically: The adjustment range includes adjusting the opening degree and adjusting the time, and the adjustment range includes one to seven levels; When the difference in supercooling When the value is ≤-6, the control device controls the electronic expansion valve to decrease by 6P within 20 seconds; When -6 < When the value is ≤-5, the control device controls the electronic expansion valve to decrease by 4P within 40 seconds; When -5 < When the value is ≤-4, the control device controls the electronic expansion valve to decrease by 2P within 60 seconds; When -4 < When the value is ≤5, the control device controls the electronic expansion valve to maintain its original opening for 130 seconds; When 5 < When the value is ≤6, the control device controls the electronic expansion valve to increase by 2P within 60 seconds; When 6 < When the value is ≤7, the control device controls the electronic expansion valve to increase by 4P within 40 seconds; When 7 < At that time, the control device controls the electronic expansion valve to increase by 6P within 20 seconds.

[0035] Table 3 Electronic Expansion Valve Position Table

[0036] In this embodiment, the adjustment of the opening degree The unit is P, and the adjustment time The unit is seconds.

[0037] For example, when the difference in subcooling... When TGL=6, that is, when the difference between the current subcooling and the target subcooling of the air conditioning unit is 6, the electronic expansion valve adjustment setting is in the D5 range, which means that the current subcooling is relatively large. The electronic expansion valve needs to perform a 60-second increase of 2P to adjust the working state of the air conditioning unit to find a suitable subcooling value.

[0038] The present invention also provides an air conditioning unit, which includes a control device and an electronic expansion valve, an ambient temperature sensor, an inlet water temperature sensor, a condenser temperature sensor, and an outlet temperature sensor, all electrically connected to the control device. The control device uses any of the control methods described above to control the operation of the air conditioning unit. The ambient temperature sensor is used to acquire the outdoor ambient temperature, the inlet water temperature sensor is used to acquire the inlet water temperature of the air conditioning unit, the condenser temperature sensor is used to acquire the condenser temperature of the air conditioning unit, and the outlet temperature sensor is used to acquire the temperature at the condenser's main outlet. The electronic expansion valve is located on the refrigeration pipe connected to the compressor.

[0039] It is understood that those skilled in the art can make equivalent substitutions or changes to the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A control method for an air conditioning unit, the air conditioning unit comprising a control device and an electronic expansion valve, an ambient temperature sensor, an inlet water temperature sensor, a condensate temperature sensor, and an outlet temperature sensor, all electrically connected to the control device; characterized in that, The control method includes the following steps: When the air conditioning unit starts operating in heating mode, the control device obtains the outdoor ambient temperature from the ambient temperature sensor. And the inlet water temperature of the air conditioning unit as fed back by the inlet water temperature sensor. ; according to and Confirm the maximum opening value of the electronic expansion valve and according to and Set the target subcooling level for the air conditioning unit ; according to , and Calculate the initial opening of the electronic expansion valve. And adjust the opening of the electronic expansion valve to ; The control device acquires the real-time condensing temperature from the condensing temperature sensor. And the real-time temperature at the condenser's main outlet, fed back by the outlet temperature sensor. ; according to and Calculate the current subcooling of the air conditioning unit ; Based on the current supercooling and target supercooling Calculate the difference in subcooling ; Based on the difference in supercooling Confirm the adjustment setting of the electronic expansion valve, and adjust the working state of the electronic expansion valve according to the determined adjustment setting.

2. The control method for an air conditioning unit according to claim 1, characterized in that, According to and Confirm the maximum opening value of the electronic expansion valve Specifically: When -30℃ < ≤-20℃ and 25℃≤ When <40℃, or when -20℃ < ≤-10℃ and 40℃≤ When <55℃, or when -10℃ < ≤-5℃ and 55℃≤ When <70℃, or when -10℃ < ≤-5℃ and 55℃≤ When <70℃, or when -5℃ < ≤5℃ and 55℃≤ When <70℃, or when -5℃ < ≤5℃ and 70℃≤ Maximum opening value of electronic expansion valve at ≤80℃ It is 465; When -30℃ < ≤-20℃ and 40℃≤ When <55℃, or when -20℃ < ≤-10℃ and 55℃≤ When <70℃, or when -10℃ < ≤-5℃ and 70℃≤ Maximum opening value of electronic expansion valve at ≤80℃ It is 460; When -20℃ < ≤-10℃ and 25℃≤ When <40℃, or when -10℃ < ≤-5℃ and 25℃≤ When <40℃, or when -10℃ < ≤-5℃ and 40℃≤ When <55℃, or when -5℃ < ≤5℃ and 40℃≤ When <55℃, or when 5℃ < ≤15℃ and 55℃≤ When <70℃, or when 5℃ < ≤15℃ and 70℃≤ Maximum opening value of electronic expansion valve at ≤80℃ It is 470; When -5℃ < ≤5℃ and 25℃≤ When <40℃, or when 5℃ < ≤15℃ and 25℃≤ When <40℃, or when 5℃ < ≤15℃ and 40℃≤ Maximum opening value of electronic expansion valve at <55℃ It is 460.

3. The control method for an air conditioning unit according to claim 1, characterized in that, The and according to and Set the target subcooling level for the air conditioning unit Specifically: When -30℃ < ≤-20℃ and 25℃≤ When the temperature is below 40℃, set the target subcooling degree for the air conditioning unit. It is 4; When -20℃ < ≤-10℃ and 25℃≤ When the temperature is below 40℃, set the target subcooling degree for the air conditioning unit. It is 5; When -30℃ < ≤-20℃ and 40℃≤ When <55℃, or when -10℃ < ≤-5℃ and 25℃≤ When the temperature is below 40℃, set the target subcooling degree for the air conditioning unit. It is 7; When -5℃ < ≤5℃ and 25℃≤ When <40℃, or when 5℃ < ≤15℃ and 25℃≤ When <40℃, or when -20℃ < ≤-10℃ and 40℃≤ When the temperature is below 55℃, set the target subcooling degree for the air conditioning unit. It is 8; When -10℃ < ≤-5℃ and 40℃≤ When the temperature is below 55℃, set the target subcooling degree for the air conditioning unit. It is 9; When -20℃ < ≤-10℃ and 55℃≤ When <70℃, or when -10℃ < ≤-5℃ and 55℃≤ When <70℃, or when -5℃ < ≤5℃ and 40℃≤ When the temperature is below 55℃, set the target subcooling degree for the air conditioning unit. It is 10; When -10℃ < ≤-5℃ and 70℃≤ When ≤80℃, or when -5℃ < ≤5℃ and 55℃≤ When the temperature is <70℃, set the target subcooling degree of the air conditioning unit. It is 11; When -5℃ < ≤5℃ and 70℃≤ When ≤80℃, or when 5℃ < ≤15℃ and 40℃≤ When <55℃, or when 5℃ < ≤15℃ and 55℃≤ When <70℃, or when 5℃ < ≤15℃ and 70℃≤ When the temperature is ≤80℃, set the target subcooling degree of the air conditioning unit. It is 12.

4. The control method for an air conditioning unit according to claim 1, characterized in that, According to , and Calculate the initial opening of the electronic expansion valve. Specifically: = ( -100) / 2+2 - .

5. The control method for an air conditioning unit according to claim 1, characterized in that, According to and Calculate the current subcooling of the air conditioning unit Specifically: = - .

6. The control method for an air conditioning unit according to claim 2, characterized in that, The current subcooling and target supercooling Calculate the difference in subcooling Specifically: = - .

7. The control method for an air conditioning unit according to claim 1, characterized in that, The basis is the difference in supercooling. Confirm the adjustment setting of the electronic expansion valve, specifically: The adjustment range includes adjustment opening and adjustment time. The adjustment range includes seven levels, with the adjustment opening gradually increasing from level one to level seven. When the difference in supercooling When the value is ≤-6, the adjustment position of the electronic expansion valve is set to level one; When -6 < When the value is ≤-5, the adjustment position of the electronic expansion valve is two. When -5 < When the temperature is ≤-4, the electronic expansion valve has three adjustment positions. When -4 < When the value is ≤5, the electronic expansion valve has four adjustment positions. When 5 < When the value is ≤6, the electronic expansion valve has five adjustment positions. When 6 < When the temperature is ≤7, the electronic expansion valve has six adjustment positions. When 7 < At that time, the electronic expansion valve has seven adjustment levels.

8. The control method for an air conditioning unit according to claim 7, characterized in that, The basis is the difference in supercooling. Confirm the adjustment setting of the electronic expansion valve, specifically: The adjustment range includes adjusting the opening degree and adjusting the time, and the adjustment range includes one to seven levels; When the difference in supercooling When the value is ≤-6, the control device controls the electronic expansion valve to decrease by 6P within 20 seconds; When -6 < When the value is ≤-5, the control device controls the electronic expansion valve to decrease by 4P within 40 seconds; When -5 < When the value is ≤-4, the control device controls the electronic expansion valve to decrease by 2P within 60 seconds; When -4 < When the value is ≤5, the control device controls the electronic expansion valve to maintain its original opening for 130 seconds; When 5 < When the value is ≤6, the control device controls the electronic expansion valve to increase by 2P within 60 seconds; When 6 < When the value is ≤7, the control device controls the electronic expansion valve to increase by 4P within 40 seconds; When 7 < At that time, the control device controls the electronic expansion valve to increase by 6P within 20 seconds.

9. An air conditioning unit, characterized in that, The air conditioning unit includes a control device and an electronic expansion valve, an ambient temperature sensor, an inlet water temperature sensor, a condenser temperature sensor, and an outlet temperature sensor, all electrically connected to the control device. The control device uses the control method for the air conditioning unit as described in any one of claims 1-8 to achieve operational control. The ambient temperature sensor is used to acquire the outdoor ambient temperature, the inlet water temperature sensor is used to acquire the inlet water temperature of the air conditioning unit, the condenser temperature sensor is used to acquire the condenser temperature of the air conditioning unit, and the outlet temperature sensor is used to acquire the temperature at the condenser's main outlet. The electronic expansion valve is located on the refrigeration pipe connected to the compressor.

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