Control method of air conditioner

Abstract

The application provides a control method of an air conditioner, comprising: starting the air conditioner, the air conditioner running a first working mode, and controlling a first electronic control valve on a connecting pipeline between a first interface of a flash evaporator and a gas supplement port of a compressor to be opened and closed according to a first control logic; and / or starting the air conditioner, the air conditioner running a second working mode, and controlling the first electronic control valve on the connecting pipeline between the first interface of the flash evaporator and the gas supplement port of the compressor to be opened and closed according to a second control logic. The application solves the problem that the dual-stage compression of the air conditioner in the prior art cannot maintain the high efficient state of gas supplement and enthalpy increase.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange systems, in particular to a control method of an air conditioner. BACKGROUND

[0002] With the continuous improvement of living quality, the demand for air conditioner heating in winter is getting higher and higher. At the same time, in order to meet the energy saving and emission reduction target, the use of electric auxiliary heating is reduced or even cancelled. The dual-stage compressor air conditioner has the advantages of high and low temperature heating capacity and high energy efficiency, and is more and more widely used in air conditioner products.

[0003] However, the existing part of the dual-stage compression supplementary gas and enthalpy increase flow adjustment is indirectly adjusted according to the first flow adjustment device and the second flow adjustment device on the pipeline before and after the flash evaporator, and the adjustment range is small. At the same time, since the flow adjustment device of the main circuit is mainly used to adjust the flow on the main circulation pipeline, the adjustment of the supplementary gas amount is weak. Therefore, the above-mentioned dual-stage compression cannot maintain the high efficiency state of supplementary gas and enthalpy increase. SUMMARY

[0004] The main purpose of the present application is to provide a control method of an air conditioner, so as to solve the problem that the dual-stage compression of the air conditioner in the prior art cannot maintain the high efficiency state of supplementary gas and enthalpy increase.

[0005] In order to achieve the above-mentioned purpose, the present application provides a control method of an air conditioner, comprising starting the air conditioner, the air conditioner running a first working mode, controlling a first electronic control valve on a communication pipeline between a first interface of a flash evaporator and a supplementary gas port of a compressor to execute opening and closing according to a first control logic; and / or, starting the air conditioner, the air conditioner running a second working mode, controlling the first electronic control valve on the communication pipeline between the first interface of the flash evaporator and the supplementary gas port of the compressor to execute opening and closing according to a second control logic.

[0006] Further, when the air conditioner runs the first working mode and the first working mode is a refrigeration mode, the first control logic is that the outdoor environment temperature T 外环 satisfies a first preset condition, and the operating frequency F 频 satisfies a second preset condition, the first electronic control valve is controlled to switch from the closed state to the open state according to the first control logic, otherwise the first electronic control valve remains in the closed state; and / or, when the air conditioner runs the second working mode and the second working mode is a heating mode, the second control logic is that the outdoor environment temperature T 外环 satisfies a third preset condition, and the operating frequency F 频 satisfies a fourth preset condition, the first electronic control valve is controlled to switch from the closed state to the open state according to the second control logic, otherwise the first electronic control valve remains in the closed state.

[0007] Furthermore, when the air conditioner operates in the first working mode, and the first working mode is cooling mode, the first preset condition is T. 外环 ≥T1, where T1 is the first preset value, and the value of T1 ranges from 20℃ to 40℃; the second preset condition is F. 频 ≥F1, where F1 is the second preset value, and F1 is calculated using the formula F1=80-A×T 外环 , where A is a coefficient, and the value of A ranges from 0.9 to 1.1.

[0008] Furthermore, when the air conditioner is operating in cooling mode, the formula for calculating the opening degree K1 of the first electronic control valve is K1 = K ac ×T 内管 +K bc ×T 外管 +K fc ×K v ×F 频 +D c Among them, K ac K bc K fc All are coefficients, and K ac K bc K fc The values ​​of T all range from -5 to 5; 内管 T represents the tube temperature of the indoor heat exchanger. 外管 The tube temperature of the outdoor heat exchanger, K v D is the volume ratio of the primary and secondary compression cylinders of the compressor. c It is a constant, and D c The value range is -100 to 200.

[0009] Furthermore, when the air conditioner operates in the second working mode, and the second working mode is the heating mode, the third preset condition is T. 外环 ≤T2, where T2 is the third preset value, and the value of T2 ranges from 0 to 10℃; the fourth preset condition is F. 频 ≥F2, where F2 is the fourth preset value, and the value range of F2 is 30Hz~50Hz.

[0010] Furthermore, when the air conditioner is operating in heating mode, the formula for calculating the opening degree K1 of the first electronic control valve is K1 = K ah ×T 内管 +K bh ×T 外管 +K fh ×K v ×F 频 +D h Among them, K ah K bh K fhAll are coefficients, and K ah K bh K fh The rounding range is -5 to 5; T 内管 T represents the tube temperature of the indoor heat exchanger. 外管 The tube temperature of the outdoor heat exchanger, K v D is the volume ratio of the primary and secondary compression cylinders of the compressor. h It is a constant, and D h The value range is -100 to 200.

[0011] Furthermore, the control parameters in the calculation formula for the opening degree K1 of the first electronic control valve include the tube temperature T of the indoor heat exchanger. 内管 The pipe temperature T of the outdoor heat exchanger 外管 The operating frequency F of the compressor 频 Furthermore, the control parameters change periodically.

[0012] Furthermore, the change period of the control parameter is t0, where the value of t0 ranges from 5s to 60s.

[0013] Furthermore, the control parameters are based on the compressor's operating frequency F. 频 The change in quantity is periodic, and the operating frequency F 频 The change exceeds the fifth preset value F k At that time, the control parameters change periodically, among which the fifth preset value F k The value range is 2Hz to 10Hz.

[0014] Furthermore, when the air conditioner is operating in the third working mode, the opening degree K1 of the first electronic control valve is in the closed state; when the air conditioner exits the third working mode and operates in the first working mode, the first electronic control valve is opened and closed according to the first control logic; or, when the air conditioner exits the third working mode and operates in the second working mode, the first electronic control valve is opened and closed according to the second control logic.

[0015] Furthermore, when the air conditioner is operating in the first working mode, the compressor's discharge port is connected to the first interface of the outdoor heat exchanger via a four-way valve, the second interface of the outdoor heat exchanger is connected to the second interface of the flash evaporator, the third interface of the flash evaporator is connected to the first interface of the indoor heat exchanger, and the second interface of the indoor heat exchanger is connected to the compressor's suction port via a four-way valve; and / or, when the air conditioner is operating in the second working mode, the compressor's discharge port is connected to the second interface of the indoor heat exchanger via a four-way valve, the first interface of the indoor heat exchanger is connected to the third interface of the flash evaporator, the second interface of the flash evaporator is connected to the second interface of the outdoor heat exchanger, and the first interface of the outdoor heat exchanger is connected to the compressor's suction port via a four-way valve.

[0016] Furthermore, a second electronic control valve is installed on the connecting pipe between the outdoor heat exchanger and the flash evaporator; and / or, a third electronic control valve is installed on the connecting pipe between the flash evaporator and the indoor heat exchanger.

[0017] The present invention provides a control method for an air conditioner, comprising: starting the air conditioner, the air conditioner operating in a first working mode, and controlling the opening and closing of a first electronic control valve on the connecting pipeline between the first interface of the flash evaporator and the air inlet of the compressor according to a first control logic; and / or starting the air conditioner, the air conditioner operating in a second working mode, and controlling the opening and closing of a first electronic control valve on the connecting pipeline between the first interface of the flash evaporator and the air inlet of the compressor according to a second control logic.

[0018] By using the first electronic control valve on the connecting pipeline between the first interface of the flash evaporator and the air supply port of the compressor, the air supply flow of the air conditioner's two-stage compression is adjusted by opening and closing the first electronic control valve, ensuring that the air supply volume of the two-stage compression is sufficient, thereby ensuring the air supply operation efficiency of the two-stage compression and thus improving the comfort of the air conditioner. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0020] Figure 1 A flowchart illustrating a control method for an air conditioner according to an optional embodiment of the present invention is shown;

[0021] Figure 2 A schematic diagram of the connection relationship of an air conditioner according to an optional embodiment of the present invention is shown.

[0022] The above figures include the following reference numerals:

[0023] 10. Flash evaporator; 20. Compressor; 30. First electronic control valve; 40. Indoor heat exchanger; 50. Outdoor heat exchanger; 60. Four-way valve; 70. Second electronic control valve; 80. Third electronic control valve. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] To address the problem that existing air conditioners with dual-stage compression cannot maintain an efficient state of enthalpy enhancement through gas replenishment, this invention provides a control method for an air conditioner.

[0026] like Figure 1 and Figure 2 As shown, the control method of the air conditioner includes starting the air conditioner, the air conditioner running a first working mode, and controlling the first electronic control valve 30 on the connecting pipeline between the first interface of the flash evaporator 10 and the air supply port of the compressor 20 to open and close according to the first control logic; and / or starting the air conditioner, the air conditioner running a second working mode, and controlling the first electronic control valve 30 on the connecting pipeline between the first interface of the flash evaporator 10 and the air supply port of the compressor 20 to open and close according to the second control logic.

[0027] By using the first electronic control valve 30 on the connecting pipeline between the first interface of the flash evaporator 10 and the air supply port of the compressor 20, the air supply flow of the air conditioner is adjusted by opening and closing the first electronic control valve 30, so as to ensure that the air supply volume of the two-stage compression is sufficient, thereby ensuring the air supply operation efficiency of the two-stage compression, and thus improving the comfort of the air conditioner.

[0028] It should be noted that in this application, the compressor 20 is a two-stage compressor, and the first electronic control valve 30 is a valve-closed, flow-free valve body, that is, when the opening of the first electronic control valve 30 is closed to the minimum opening, the flow rate passing through it is 0.

[0029] Considering the control of the replenishment air volume, it is theoretically related to the suction and discharge pressures of compressor 20, and also to the volume ratio of the first and second stage compression cylinders of compressor 20. In practical engineering applications of small household air conditioners, it is uneconomical to set up suction and discharge pressure sensors to monitor the system pressure in order to consider the cost-effectiveness of the product. This application uses the first electronic control valve 30 to adjust the replenishment air flow of the two-stage compressor, solving the problem of insufficient replenishment air volume adjustment of compressor 20, and also realizing the dynamic adjustment of the replenishment air flow of compressor 20 to achieve efficient operation under all working conditions, improving the replenishment air operation efficiency of the two-stage compressor, thereby improving the comfort of the air conditioner. Based on the adjustment of the intermediate replenishment enthalpy flow of the two-stage compressor, this application effectively improves the operating efficiency of the two-stage compression system, improves the low-temperature heating effect, and improves the comfort of the air conditioner, as detailed below:

[0030] It should be noted that, in this application, when the air conditioner operates in the first working mode, and the first working mode is the cooling mode, the first control logic is to detect the outdoor ambient temperature T. 外环 The first preset condition is met, and the operating frequency F of compressor 20 is... 频When the second preset condition is met, the first electronic control valve 30 is switched from the closed state to the open state according to the first control logic; otherwise, the first electronic control valve 30 remains in the closed state; and / or, when the air conditioner operates in the second working mode, and the second working mode is the heating mode, the second control logic detects the outdoor ambient temperature T. 外环 The third preset condition is met, and the operating frequency F of compressor 20 is... 频 When the fourth preset condition is met, the first electronic control valve 30 is switched from the closed state to the open state according to the second control logic; otherwise, the first electronic control valve 30 remains in the closed state. This ensures the reliability of the air supply adjustment in different operating modes of the air conditioner, as well as the overall operational reliability of the air conditioner.

[0031] Furthermore, when the air conditioner is running in cooling mode, as the outdoor ambient temperature or the operating frequency of compressor 20 increases, the compression ratio of compressor 20 increases, thus increasing the required amount of supplementary gas. Similarly, when the air conditioner is running in heating mode, the lower the outdoor ambient temperature or the higher the operating frequency of compressor 20, the greater the required amount of supplementary gas. Increasing the amount of supplementary gas can effectively reduce the power consumption of compressor 20 and improve its efficiency, thereby improving the energy efficiency of the air conditioner. Of course, increasing the amount of supplementary gas will reduce the flow rate into the evaporator (indoor heat exchanger 40) for cooling, thus reducing the cooling capacity. Therefore, controlling the supplementary gas flow rate is also of great significance. As mentioned above, the required amount of supplementary gas is related to the suction pressure and discharge pressure of compressor 20, and also to the volume ratio of the first-stage and second-stage compression cylinders of compressor 20. In the absence of detectable suction and discharge pressures, the pipe temperature of evaporator (indoor heat exchanger 40) and condenser (outdoor heat exchanger 50) can be used to approximate the pressure on the low-pressure side and high-pressure side of the air conditioner. The specific control logic is as follows:

[0032] Detecting the outdoor ambient temperature T during air conditioner operation 外环 1. Evaporator (indoor heat exchanger 40) pipe temperature T 内管 The pipe temperature T of the condenser (outdoor heat exchanger 50) 外管 The operating frequency F of compressor 20 频The output parameters are the opening degree K1 of the first electronic control valve 30, the opening degree K2 of the second electronic control valve 70, and the opening degree K3 of the third electronic control valve 80. When the air conditioner is running in cooling mode, the opening degree K2 of the second electronic control valve 70 is set to the maximum, and the opening degree K3 of the third electronic control valve 80 is controlled according to the existing target exhaust control logic. When the air conditioner is running in heating mode, the opening degree K3 of the third electronic control valve 80 is set to the maximum, and the opening degree K2 of the second electronic control valve 70 is controlled according to the existing target exhaust control logic. This will not be elaborated on here. In addition, when the compressor is detected to be in a closed state, the opening degree K1 of the first electronic control valve 30 is 0, that is, the first electronic control valve 30 is closed, so as to facilitate the rapid establishment of pressure difference in the compressor 20 and prevent liquid refrigerant from entering the air inlet of the compressor 20 when the air conditioner is turned on. The following describes the control of the opening degree K1 of the first electronic control valve 30.

[0033] like Figure 1 As shown, when the air conditioner operates in the first working mode, and the first working mode is cooling mode, the first preset condition is T. 外环 ≥T1, where T1 is the first preset value, and the value of T1 ranges from 20℃ to 40℃; the second preset condition is F. 频 ≥F1, where F1 is the second preset value, and F1 is calculated using the formula F1=80-A×T 外环 , where A is a coefficient, and the value of A ranges from 0.9 to 1.1.

[0034] Preferably, T1 is 35°C and A is 1.05.

[0035] It should be noted that, in this application, when the air conditioner controls the opening and closing of the first electronic control valve 30 according to the first control logic, and the air conditioner is running in cooling mode, the calculation formula for the opening degree K1 of the first electronic control valve 30 is K1 = K ac ×T 内管 +K bc ×T 外管 +K fc ×K v ×F 频 +D c Among them, K ac K bc K fc All are coefficients, and K ac K bc K fc The values ​​of T all range from -5 to 5; 内管 The tube temperature of the indoor heat exchanger is 40°C, T 外管 The tube temperature of the outdoor heat exchanger is 50 K. v D represents the volume ratio of the primary and secondary compression cylinders of compressor 20.c It is a constant, and D c The value range is -100 to 200.

[0036] like Figure 1 As shown, when the air conditioner is operating in the second working mode, and the second working mode is the heating mode, the third preset condition is T. 外环 ≤T2, where T2 is the third preset value, and the value of T2 ranges from 0 to 10℃; the fourth preset condition is F. 频 ≥F2, where F2 is the fourth preset value, and the value range of F2 is 30Hz~50Hz.

[0037] Preferably, T2 is 5°C and F2 is 40Hz.

[0038] It should be noted that, in this application, when the air conditioner controls the opening and closing of the first electronic control valve 30's opening degree K1 according to the second control logic, and the air conditioner is operating in heating mode, the calculation formula for the opening degree K1 of the first electronic control valve 30 is K1 = K ah ×T 内管 +K bh ×T 外管 +K fh ×K v ×F 频 +D h Among them, K ah K bh K fh All are coefficients, and K ah K bh K fh The rounding range is -5 to 5; T 内管 The tube temperature of the indoor heat exchanger is 40°C, T 外管 The tube temperature of the outdoor heat exchanger is 50 K. v D represents the volume ratio of the primary and secondary compression cylinders of compressor 20. h It is a constant, and D h The value range is -100 to 200.

[0039] It should be noted that, in this application, all the above coefficients were obtained based on experimental fitting.

[0040] It should be noted that, in this application, the control parameters in the calculation formula for the opening degree K1 of the first electronic control valve 30 include the pipe temperature T of the indoor heat exchanger 40. 内管 The pipe temperature T of the outdoor heat exchanger is 50. 外管 The operating frequency F of compressor 20 频 Furthermore, the control parameters change periodically.

[0041] Optionally, the change period of the control parameter is t0, where the value of t0 ranges from 5s to 60s.

[0042] Preferably, t0 is 30s.

[0043] Optionally, the control parameters are based on the operating frequency F of the compressor 20. 频 The change in quantity is periodic, and the operating frequency F 频 The change exceeds the fifth preset value F k At that time, the control parameters change periodically, among which the fifth preset value F k The value range is 2Hz to 10Hz.

[0044] Preferably, the fifth preset value F k The value is 4Hz.

[0045] It should be noted that, in this application, the reason for setting the control parameters to change periodically is explained here: For example, according to the currently read parameters, the calculated opening degree K1 is 200 steps, but the parameters read at the next moment may calculate it to be 201 steps. If the opening degree K1 of the first electronic control valve 30 is constantly adjusted and updated, the opening degree K1 may fluctuate back and forth due to the existence of critical parameters, resulting in system control fluctuations. Therefore, the update period t0 time or frequency change exceeds F k The parameters read once are updated, thereby updating the control parameters of the first electronic control valve 30.

[0046] It should be noted that in this application, when the air conditioner is running in the third working mode, the opening degree K1 of the first electronic control valve 30 is in the closed state; when the air conditioner exits the third working mode and runs in the first working mode, the first electronic control valve 30 performs opening and closing according to the first control logic; or, when the air conditioner exits the third working mode and runs in the second working mode, the first electronic control valve 30 performs opening and closing according to the second control logic.

[0047] Furthermore, the aforementioned third working mode can be a defrosting mode, an oil return mode, etc.

[0048] like Figure 1 and Figure 2As shown, when the air conditioner is operating in the first working mode, the exhaust port of the compressor 20 is connected to the first interface of the outdoor heat exchanger 50 through the switching of the four-way valve 60, the second interface of the outdoor heat exchanger 50 is connected to the second interface of the flash evaporator 10, the third interface of the flash evaporator 10 is connected to the first interface of the indoor heat exchanger 40, and the second interface of the indoor heat exchanger 40 is connected to the suction port of the compressor 20 through the switching of the four-way valve 60; and / or, when the air conditioner is operating in the second working mode, the exhaust port of the compressor 20 is connected to the second interface of the indoor heat exchanger 40 through the switching of the four-way valve 60, the first interface of the indoor heat exchanger 40 is connected to the third interface of the flash evaporator 10, the second interface of the flash evaporator 10 is connected to the second interface of the outdoor heat exchanger 50, and the first interface of the outdoor heat exchanger 50 is connected to the suction port of the compressor 20 through the switching of the four-way valve 60.

[0049] Furthermore, a second electronic control valve 70 is provided on the connecting pipe between the outdoor heat exchanger 50 and the flash evaporator 10; and / or, a third electronic control valve 80 is provided on the connecting pipe between the flash evaporator 10 and the indoor heat exchanger 40.

[0050] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0051] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0052] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0053] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0054] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A control method of an air conditioner, characterized by, Comprising: starting an air conditioner, the air conditioner operating a first working mode, and controlling a first electronic control valve (30) on a communication pipeline between a first interface of a flash evaporator (10) and a gas supplement port of a compressor (20) to open and close according to a first control logic; when the air conditioner operates the first working mode and the first working mode is a cooling mode, The first control logic is that when the outdoor ambient temperature T 外环 satisfies a first preset condition, and the operating frequency F 频 satisfies a second preset condition, the first electronic control valve (30) is switched from the closed state to the open state according to the first control logic, otherwise the first electronic control valve (30) remains in the closed state. The first preset condition is T 外环 ≥ T1, wherein T1 is a first preset value, and the value range of T1 is 20℃-40℃. The second preset condition is F 频 ≥ F1, wherein F1 is a second preset value, and F1 is calculated by a formula F1 = 80 - A × T 外环 , wherein A is a coefficient, and a value range of A is 0.9-1.

1.

2. The control method according to claim 1, wherein, The opening degree K1 of the first electronic control valve (30) when the air conditioner operates in the cooling mode is calculated by the formula K1=K ac ×T 内管 +K bc ×T 外管 +K fc ×K v ×F 频 +D c ; Wherein, K ac , K bc , K fc are coefficients, and the value range of K ac , K bc , K fc is -5~5; T 内管 T is a tube temperature of the indoor heat exchanger (40), K 外管 T is a tube temperature of the outdoor heat exchanger (50), K v D is a volume ratio of the primary compression cylinder and the secondary compression cylinder of the compressor (20), D c D is a constant, and D c D has a value range of -100~200.

3. The control method according to claim 2, characterized by, The control parameters in the calculation formula of the opening degree K1 of the first electronic control valve (30) include the tube temperature T of the indoor heat exchanger (40) 内管 , the tube temperature T of the outdoor heat exchanger (50) 外管 , the operating frequency F of the compressor (20) 频 , and the control parameters periodically change.

4. The control method according to claim 3, characterized by a change period of the control parameter is t0, wherein t0 is in a range of 5s-60s.

5. The control method according to claim 3, characterized by, The control parameters are based on the operating frequency F of the compressor (20). 频 The change in the quantity varies periodically, and the operating frequency F 频 The change exceeds the fifth preset value F k At that time, the control parameters change periodically, wherein the fifth preset value F k The value range is 2Hz ~ 10Hz.

6. The control method according to claim 1, wherein, when the air conditioner operates a third working mode, an opening degree K1 of the first electronic control valve (30) is in the closed state; when the air conditioner exits the third working mode and operates the first working mode, the first electronic control valve (30) opens and closes according to the first control logic.

7. The control method according to any one of claims 1-6, wherein, when the air conditioner operates the first working mode, an exhaust port of the compressor (20) is communicated with a first interface of an outdoor heat exchanger (50) through switching of a four-way valve (60), a second interface of the outdoor heat exchanger (50) is communicated with a second interface of the flash evaporator (10), a third interface of the flash evaporator (10) is communicated with a first interface of an indoor heat exchanger (40), and a second interface of the indoor heat exchanger (40) is communicated with a suction port of the compressor (20) through switching of the four-way valve (60).

8. The control method according to claim 7, wherein, a second electronic control valve (70) is arranged on a communication pipeline between the outdoor heat exchanger (50) and the flash evaporator (10).

9. A control method of an air conditioner, characterized by, Comprising: starting an air conditioner, the air conditioner operating a second working mode, and controlling a first electronic control valve (30) on a communication pipeline between a first interface of a flash evaporator (10) and a gas supplement port of a compressor (20) to open and close according to a second control logic; when the air conditioner operates the second working mode and the second working mode is a heating mode, The second control logic is that when the outdoor environment temperature T 外环 The third preset condition is met, and the operating frequency F 频 When the fourth preset condition is met, the first electronic control valve (30) is switched from the closed state to the open state according to the second control logic, otherwise the first electronic control valve (30) remains in the closed state. The third preset condition is T 外环 ≤ T2, wherein T2 is a third preset value, and a value range of T2 is 0-10℃. The fourth preset condition is F 频 ≥ F2, wherein F2 is a fourth preset value, and the value range of F2 is 30 Hz ~ 50 Hz.

10. The control method according to claim 9, wherein, The opening degree K1 of the first electronic control valve (30) when the air conditioner operates the heating mode is calculated by the formula K1=K ah ×T 内管 +K bh ×T 外管 +K fh ×K v ×F 频 +D h ; Wherein, K ah , K bh , K fh are coefficients, and K ah , K bh , K fh are all rounded in the range of -5~5. T 内管 T is a tube temperature of the indoor heat exchanger (40), K 外管 T is a tube temperature of the outdoor heat exchanger (50), K v D is a volume ratio of the primary compression cylinder and the secondary compression cylinder of the compressor (20), D h D is a constant, and D h D has a value range of -100~200.

11. The control method according to claim 10, characterized by, The control parameters in the calculation formula of the opening degree K1 of the first electronic control valve (30) include the tube temperature T of the indoor heat exchanger (40) 内管 , the tube temperature T of the outdoor heat exchanger (50) 外管 , the operating frequency F of the compressor (20) 频 , and the control parameters periodically change.

12. The control method according to claim 11, characterized by, a change period of the control parameter is t0, wherein t0 is in a range of 5s-60s.

13. The control method according to claim 11, characterized by, The control parameters are based on the operating frequency F of the compressor (20). 频 The change in the quantity varies periodically, and the operating frequency F 频 The change exceeds the fifth preset value F k At that time, the control parameters change periodically, wherein the fifth preset value F k The value range is 2Hz ~ 10Hz.

14. The control method according to claim 9, wherein, when the air conditioner operates a third working mode, an opening degree K1 of the first electronic control valve (30) is in the closed state; when the air conditioner exits the third working mode and operates the second working mode, the first electronic control valve (30) opens and closes according to the second control logic.

15. The control method according to any one of claims 9-14, wherein, When the air conditioner operates the second working mode, the exhaust port of the compressor (20) is communicated with the second interface of the indoor heat exchanger (40) through switching of the four-way valve (60), the first interface of the indoor heat exchanger (40) is communicated with the third interface of the flash evaporator (10), the second interface of the flash evaporator (10) is communicated with the second interface of the outdoor heat exchanger (50), and the first interface of the outdoor heat exchanger (50) is communicated with the suction port of the compressor (20) through switching of the four-way valve (60).

16. The control method according to claim 15, characterized by A third electronic control valve (80) is arranged on the communication pipeline between the flash evaporator (10) and the indoor heat exchanger (40).

17. A control method of an air conditioner, characterized by, Comprising: Starting the air conditioner, the air conditioner operates the first working mode, and the first electronic control valve (30) on the communication pipeline between the first interface of the flash evaporator (10) and the gas supplement port of the compressor (20) is controlled to open and close according to the first control logic; When the air conditioner operates the first working mode and the first working mode is the refrigeration mode, The first control logic is that when the outdoor environment temperature T 外环 satisfies a first preset condition, and the operating frequency F 频 satisfies a second preset condition, the first electronic control valve (30) is switched from the closed state to the open state according to the first control logic, otherwise the first electronic control valve (30) remains in the closed state. The first preset condition is T 外环 ≥ T1, wherein T1 is a first preset value, and the value range of T1 is 20℃-40℃. The second preset condition is F 频 ≥ F1, wherein F1 is a second preset value, and F1 is calculated by a formula F1 = 80 - A × T 外环 , wherein A is a coefficient, and a value range of A is 0.9-1.

1. Starting the air conditioner, the air conditioner operates the second working mode, and the first electronic control valve (30) on the communication pipeline between the first interface of the flash evaporator (10) and the gas supplement port of the compressor (20) is controlled to open and close according to the second control logic; When the air conditioner operates the second working mode and the second working mode is the heating mode, The second control logic is that when the outdoor environment temperature T 外环 The third preset condition is met, and the operating frequency F 频 When the fourth preset condition is met, the first electronic control valve (30) is switched from the closed state to the open state according to the second control logic, otherwise the first electronic control valve (30) remains in the closed state. The third preset condition is T 外环 ≤ T2, wherein T2 is a third preset value, and a value range of T2 is 0-10℃. The fourth preset condition is F 频 ≥ F2, wherein F2 is a fourth preset value, and the value range of F2 is 30 Hz ~ 50 Hz.

18. The control method according to claim 17, wherein, The opening degree K1 of the first electronic control valve (30) when the air conditioner operates in the cooling mode is calculated by the formula K1=K ac ×T 内管 +K bc ×T 外管 +K fc ×K v ×F 频 +D c ; wherein K ac , K bc , K fc are coefficients, and K ac , K bc , K fc have a value range of -5~5; T 内管 T is a tube temperature of the indoor heat exchanger (40), K 外管 T is a tube temperature of the outdoor heat exchanger (50), K v D is a volume ratio of the primary compression cylinder and the secondary compression cylinder of the compressor (20), D c D is a constant, and D c D has a value range of -100~200.

19. The control method according to claim 17, wherein, The opening degree K1 of the first electronic control valve (30) when the air conditioner operates the heating mode is calculated by the formula K1=K ah ×T 内管 +K bh ×T 外管 +K fh ×K v ×F 频 +D h ; Wherein, K ah , K bh , K fh are coefficients, and K ah , K bh , K fh are all rounded in the range of -5~5. T 内管 T is a tube temperature of the indoor heat exchanger (40), K 外管 T is a tube temperature of the outdoor heat exchanger (50), K v D is a volume ratio of the primary compression cylinder and the secondary compression cylinder of the compressor (20), D h D is a constant, and D h D has a value range of -100~200.

20. The control method according to claim 18 or 19, characterized by, The control parameters in the calculation formula of the opening degree K1 of the first electronic control valve (30) include the tube temperature T of the indoor heat exchanger (40) 内管 , the tube temperature T of the outdoor heat exchanger (50) 外管 , the operating frequency F of the compressor (20) 频 , and the control parameters periodically change.

21. The control method according to claim 20, wherein The change period of the control parameter is t0, wherein the value range of t0 is 5s-60s.

22. The control method according to claim 20, wherein The control parameters are based on the operating frequency F of the compressor (20). 频 The change in the quantity is periodically varied, and the operating frequency F 频 The change exceeds the fifth preset value F k At that time, the control parameters change periodically, wherein the fifth preset value F k The value range is 2Hz ~ 10Hz.

23. The control method according to claim 17, wherein, When the air conditioner operates the third working mode, the opening degree K1 of the first electronic control valve (30) is in the closed state; When the air conditioner exits the third working mode and operates the first working mode, the first electronic control valve (30) is controlled to open and close according to the first control logic; Or, When the air conditioner exits the third working mode and operates the second working mode, the first electronic control valve (30) is controlled to open and close according to the second control logic.

24. The control method according to any one of claims 17-19, wherein, When the air conditioner operates the first working mode, the exhaust port of the compressor (20) is communicated with the first interface of the outdoor heat exchanger (50) through switching of the four-way valve (60), the second interface of the outdoor heat exchanger (50) is communicated with the second interface of the flash evaporator (10), the third interface of the flash evaporator (10) is communicated with the first interface of the indoor heat exchanger (40), and the second interface of the indoor heat exchanger (40) is communicated with the suction port of the compressor (20) through switching of the four-way valve (60). When the air conditioner operates the second working mode, the discharge port of the compressor (20) is communicated with the second interface of the indoor heat exchanger (40) through switching of the four-way valve (60), the first interface of the indoor heat exchanger (40) is communicated with the third interface of the flash evaporator (10), the second interface of the flash evaporator (10) is communicated with the second interface of the outdoor heat exchanger (50), and the first interface of the outdoor heat exchanger (50) is communicated with the suction port of the compressor (20) through switching of the four-way valve (60).

25. The control method according to claim 24, wherein A second electronic control valve (70) is arranged on the communication pipeline between the outdoor heat exchanger (50) and the flash evaporator (10); A third electronic control valve (80) is arranged on the communication pipeline between the flash evaporator (10) and the indoor heat exchanger (40).

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