Control method of air conditioner

Abstract

The invention provides an air conditioner control method which comprises the steps that an air conditioner is started, the air conditioner operates in a first working mode, and a first electronic control valve on a communicating pipeline between a first connector of a flash evaporator and an air supplementing opening of a compressor is controlled to be opened and closed according to first control logic; and / or, the air conditioner is started, the air conditioner operates in a second working mode, and the first electronic control valve on the communicating pipeline between the first connector of the flash evaporator and the air supplementing opening of the compressor is controlled to be opened and closed according to the second control logic. The problem that in the prior art, two-stage compression of an air conditioner cannot keep the efficient state of air supplementing and enthalpy increasing is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange systems, and in particular to a control method for an air conditioner. Background Art

[0002] With the continuous improvement of the quality of life, the demand for air conditioning heating in winter is getting higher and higher. At the same time, in order to meet the energy conservation and emission reduction goals, reduce or even eliminate the use of electric auxiliary heating, two-stage compressor air conditioners have the advantages of high and low temperature heating capacity and high energy efficiency, and are increasingly used in air conditioning products.

[0003] However, the regulation of the air replenishment and enthalpy increase flow rate of the existing partial two-stage compression is indirectly regulated according to the primary flow regulating device and the secondary flow regulating device on the pipelines before and after the flash evaporator, and the adjustment range is small. At the same time, since the flow regulating device of the main line is mainly used to adjust the flow on the main circulation pipeline, the regulation of the air replenishment amount is relatively weak. Therefore, the above-mentioned two-stage compression cannot maintain the efficient state of air replenishment and enthalpy increase. Summary of the invention

[0004] The main purpose of the present invention is to provide a control method for an air conditioner to solve the problem that the two-stage compression of the air conditioner in the prior art cannot maintain a high efficiency state of air replenishment and enthalpy increase.

[0005] In order to achieve the above-mentioned objectives, 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 a first electronic control valve on a connecting pipeline between a first interface of a flash evaporator and an air supply port of a compressor to perform opening and closing according to a first control logic; and / or starting the air conditioner, the air conditioner operating in a second working mode, and controlling a first electronic control valve on a connecting pipeline between a first interface of a flash evaporator and an air supply port of a compressor to perform opening and closing according to a second control logic.

[0006] Furthermore, when the air conditioner operates in the first working mode and the first working mode is the cooling mode, the first control logic detects the outdoor ambient temperature T 外环 The first preset condition is met and the operating frequency of the compressor is F 频 When the second preset condition is met, 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 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 of the compressor F 频 When the fourth preset condition is met, the first electronically controlled valve is controlled to switch from the closed state to the open state according to the second control logic; otherwise, the first electronically controlled valve remains in the closed state.

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

[0008] Furthermore, when the air conditioner is in cooling mode, the calculation formula of 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 are coefficients, and K ac , K bc , K fc The value range of T is -5 to 5. 内管 is the tube temperature of the indoor heat exchanger, T 外管 is the tube temperature of the outdoor heat exchanger, K v D is the volume ratio of the first compression cylinder and the second compression cylinder of the compressor. c 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 range of T2 is 0-10°C; the fourth preset condition is F 频 ≥F2, where F2 is a fourth preset value and the value range of F2 is 30 Hz to 50 Hz.

[0010] Furthermore, when the air conditioner is in heating mode, the calculation formula of 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 fhare coefficients, and K ah , K bh , K fh The rounding range of T is -5 to 5; 内管 is the tube temperature of the indoor heat exchanger, T 外管 is the tube temperature of the outdoor heat exchanger, K v D is the volume ratio of the first compression cylinder and the second compression cylinder of the compressor. h is a constant, and D h The value range is -100 to 200.

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

[0012] Furthermore, the change period of the control parameter is t0, wherein the value range of t0 is 5s to 60s.

[0013] Furthermore, the control parameters are based on the operating frequency F of the compressor. 频 The change of the amount changes periodically, and the operating frequency F 频 The change in value exceeds the fifth preset value F k When the control parameter changes periodically, the fifth preset value F k The value range is 2Hz~10Hz.

[0014] Furthermore, when the air conditioner operates in the third working mode, the opening K1 of the first electronic control valve is in a 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] Further, when the air conditioner operates in the first working mode, the exhaust port of the compressor is connected to the first interface of the outdoor heat exchanger through the switching of the 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 suction port of the compressor through the switching of the four-way valve; and / or, when the air conditioner operates in the second working mode, the exhaust port of the compressor is connected to the second interface of the indoor heat exchanger through the switching of the 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 suction port of the compressor through the switching of the four-way valve.

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

[0017] By applying the technical solution of the present invention, a control method for an air conditioner is provided, comprising starting the air conditioner, the air conditioner operating in a first working mode, and controlling a first electronic control valve on a connecting pipeline between a first interface of a flash evaporator and an air supply port of a compressor to execute opening and closing according to a first control logic; and / or starting the air conditioner, the air conditioner operating in a second working mode, and controlling a first electronic control valve on a connecting pipeline between a first interface of a flash evaporator and an air supply port of a compressor to execute opening and closing according to a second control logic.

[0018] By opening and closing 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 double-stage compression air supply flow of the air conditioner is adjusted to ensure that the double-stage compression air supply volume is sufficient, thereby ensuring the double-stage compression air supply operation efficiency, and then improving the comfort of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 A schematic flow chart showing a method for controlling an air conditioner according to an optional embodiment of the present invention is shown;

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

[0022] The above drawings 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 DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In order to solve the problem that the two-stage compression of the air conditioner in the prior art cannot maintain a high efficiency state of air replenishment and enthalpy increase, the present invention provides a control method for the 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 operates in 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 perform opening and closing according to the first control logic; and / or starting the air conditioner, the air conditioner operates in 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 perform opening and closing according to the second control logic.

[0027] By means of 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 two-stage compression air supply flow of the air conditioner is adjusted by opening and closing the first electronic control valve 30 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 then improving the comfort of the air conditioner.

[0028] It should be noted that, in the present application, the above-mentioned compressor 20 is a two-stage compressor, and the above-mentioned first electronic control valve 30 is a closed valve body with no flow, that is, when the opening of the first electronic control valve 30 is closed to the minimum opening, the flow passing therethrough is 0.

[0029] Considering the control of the air supply volume, in theory, it is related to the suction pressure and exhaust pressure of the compressor 20, and is also related to the volume ratio of the first-stage compression cylinder and the second-stage compression cylinder of the compressor 20. In the actual engineering application of small household air conditioners, in order to consider the cost-effectiveness of the product, it is not economical to set sensors for suction pressure and exhaust pressure to monitor the pressure of the system. The present application adjusts the air supply flow of the two-stage compressor through the first electronic control valve 30, solves the problem of insufficient adjustment of the air supply volume of the compressor 20, and also realizes the dynamic adjustment of the air supply flow of the compressor 20 to achieve the purpose of efficient operation under all working conditions, improves the air supply operation efficiency of the two-stage compressor, and thus improves the comfort of the air conditioner. The present application is based on the adjustment of the intermediate air supply enthalpy increase flow of the two-stage compressor, which 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 follows:

[0030] It should be noted that, in the present 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 the compressor 20 频When the second preset condition is met, the first electronic control valve 30 is controlled to switch from the closed state to the open state according to the first control logic, otherwise the first electronic control valve 30 is still 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 the compressor 20 频 When the fourth preset condition is met, the first electronic control valve 30 is controlled to switch 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. In this way, the reliability of adjusting the air supply volume of the air conditioner in different working modes and the reliability of the operation of the air conditioner are ensured.

[0031] Furthermore, when the air conditioner is running in cooling mode, as the outdoor ambient temperature or the operating frequency of the compressor 20 increases, the compression ratio of the compressor 20 increases, and the required air supply volume increases at this time. Similarly, when the air conditioner is running in heating mode, the lower the outdoor ambient temperature or the higher the operating frequency of the compressor 20, the greater the required air supply volume. The increase in the air supply volume can effectively reduce the power consumption of the compressor 20, improve the efficiency of the compressor 20, and thus improve the energy efficiency of the air conditioner. Of course, the increase in the air supply volume will reduce the flow rate entering the evaporator (indoor heat exchanger 40) for refrigeration, thereby reducing the cooling capacity. Therefore, the control of the air supply flow rate is also of great significance. As mentioned above, the demand for air supply volume is related to the suction pressure and exhaust pressure of the compressor 20, and is also related to the volume ratio of the first compression cylinder and the second compression cylinder of the compressor 20. When the suction pressure and the exhaust pressure cannot be detected, the pipe temperature of the evaporator (indoor heat exchanger 40) and the pipe temperature of the condenser (outdoor heat exchanger 50) can be used to fit the pressure of the low-pressure side and the high-pressure side of the air conditioner. The specific control logic is as follows:

[0032] Detect the outdoor ambient temperature T during air conditioner operation 外环 , the tube temperature T of the evaporator (indoor heat exchanger 40) 内管 , the tube temperature T of the condenser (outdoor heat exchanger 50) 外管 , the operating frequency F of the compressor 20 频; The output parameters are the opening K1 of the first electronic control valve 30, the opening K2 of the second electronic control valve 70, and the opening K3 of the third electronic control valve 80, wherein, when the air conditioner operates in cooling mode, the opening K2 of the second electronic control valve 70 is set to the maximum, and the opening K3 of the third electronic control valve 80 is controlled according to the existing target exhaust control logic; when the air conditioner operates in heating mode, the opening K3 of the third electronic control valve 80 is set to the maximum, and the opening K2 of the second electronic control valve 70 is controlled according to the existing target exhaust control logic, which will not be described in detail here. In addition, when it is detected that the compressor is in the off state, the opening K1 of the first electronic control valve 30 is 0, that is, the first electronic control valve 30 is closed to facilitate the rapid establishment of a pressure difference in the compressor 20, and to prevent the liquid refrigerant from entering the air supply port of the compressor 20 when the air conditioner is turned on. The following application describes the control of the opening K1 of the first electronic control valve 30.

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

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

[0035] It should be noted that, in the present application, when the air conditioner controls the opening and closing of the opening K1 of the first electronic control valve 30 according to the first control logic, and the air conditioner operates in the cooling mode, the calculation formula of the opening 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 are coefficients, and K ac , K bc , K fc The value range of T is -5 to 5. 内管 is the tube temperature of the indoor heat exchanger 40, T 外管 is the tube temperature of the outdoor heat exchanger 50, K v is the volume ratio of the first compression cylinder and the second compression cylinder of the compressor 20, Dc is a constant, and D c The value range is -100 to 200.

[0036] like Figure 1 As shown, 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 range of T2 is 0-10°C; the fourth preset condition is F 频 ≥F2, where F2 is a fourth preset value and the value range of F2 is 30 Hz to 50 Hz.

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

[0038] It should be noted that, in the present application, when the air conditioner controls the opening and closing of the opening K1 of the first electronic control valve 30 according to the second control logic, and the air conditioner operates in the heating mode, the calculation formula of the opening 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 are coefficients, and K ah , K bh , K fh The rounding range of T is -5 to 5; 内管 is the tube temperature of the indoor heat exchanger 40, T 外管 is the tube temperature of the outdoor heat exchanger 50, K v is the volume ratio of the first compression cylinder and the second compression cylinder of the compressor 20, D h is a constant, and D h The value range is -100 to 200.

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

[0040] It should be noted that, in the present application, 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 change periodically.

[0041] Optionally, a change period of the control parameter is t0, wherein the value range of t0 is 5s to 60s.

[0042] Preferably, the value of t0 is 30s.

[0043] Optionally, the control parameter is based on the operating frequency F of the compressor 20. 频 The change of the amount changes periodically, and the operating frequency F 频 The change in value exceeds the fifth preset value F k When the control parameter changes periodically, the fifth preset value F k The value range is 2Hz~10Hz.

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

[0045] It should be noted that in this application, the reason why the control parameters are set to change periodically is explained here: for example, according to the currently read parameters, the calculated opening K1 is 200 steps, and the parameters read at the next moment may be calculated to be 201 steps. If the opening K1 of the first electronic control valve 30 is adjusted and updated at all times, the opening 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 the frequency change exceeds F is specified. 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 the present application, when the air conditioner operates in the third working mode, the opening K1 of the first electronic control valve 30 is in a closed state; when the air conditioner exits the third working mode and operates in the first working mode, the first electronic control valve 30 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 30 is opened and closed according to the second control logic.

[0047] Furthermore, the third working mode mentioned above may be a defrost mode, an oil return mode, or the like.

[0048] like Figure 1 and Figure 2As shown, when the air conditioner operates 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 operates 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] Further, a second electronically controlled valve 70 is provided on the communication pipeline between the outdoor heat exchanger 50 and the flash evaporator 10 ; and / or a third electronically controlled valve 80 is provided on the communication pipeline between the flash evaporator 10 and the indoor heat exchanger 40 .

[0050] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0051] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

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

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

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

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for controlling an air conditioner, characterized in that: include: The air conditioner is started, the air conditioner operates in a first working mode, and a first electronic control valve (30) on a connecting pipeline between a first interface of the flash evaporator (10) and an air supply port of the compressor (20) is controlled to be opened and closed according to a first control logic; and / or, The air conditioner is started and operates in a second working mode, and a first electronic control valve (30) on a connecting pipeline between a first interface of the flash evaporator (10) and an air supply port of the compressor (20) is controlled to be opened and closed according to a second control logic.

2. The control method according to claim 1, characterized in that: When the air conditioner operates in the first working mode and the first working mode is a cooling mode, The first control logic detects the outdoor ambient temperature T 外环 The first preset condition is met, and the operating frequency F of the compressor (20) 频 When a second preset condition is met, the first electronic control valve (30) is controlled to switch from a closed state to an 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 a 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 the compressor (20) 频 When a fourth preset condition is met, the first electronic control valve (30) is controlled to switch from a closed state to an open state according to the second control logic; otherwise, the first electronic control valve (30) remains in the closed state.

3. The control method according to claim 2, characterized in that: When the air conditioner operates in the first working mode and the first working mode is a cooling mode, The first preset condition is T 外环 ≥T1, where T1 is a first preset value and the value range of T1 is 20°C to 40°C; The second preset condition is F 频 ≥F1, where F1 is the second preset value, and F1 is calculated by the formula F1=80-A×T 外环 , where A is a coefficient and the value range of A is 0.9 to 1.

1.

4. The control method according to claim 2, characterized in that: When the air conditioner operates in the cooling mode, the calculation formula of 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 are coefficients, and K ac , K bc , K fc The value range of is -5 to 5; T 内管 is the tube temperature of the indoor heat exchanger (40), T 外管 is the tube temperature of the outdoor heat exchanger (50), K v is the volume ratio of the first compression cylinder and the second compression cylinder of the compressor (20), D c is a constant, and D c The value range is -100 to 200.

5. The control method according to claim 2, characterized in that: When the air conditioner operates in the second working mode and the second working mode is a heating mode, The third preset condition is T 外环 ≤T2, where T2 is a third preset value and the value range of T2 is 0 to 10°C; The fourth preset condition is F 频 ≥F2, where F2 is a fourth preset value and the value range of F2 is 30 Hz to 50 Hz.

6. The control method according to claim 2, characterized in that: When the air conditioner operates in the heating mode, the calculation formula of 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 are coefficients, and K ah , K bh , K fh The rounding range is -5 to 5; T 内管 is the tube temperature of the indoor heat exchanger (40), T 外管 is the tube temperature of the outdoor heat exchanger (50), K v is the volume ratio of the first compression cylinder and the second compression cylinder of the compressor (20), D h is a constant, and D h The value range is -100 to 200.

7. The control method according to claim 4 or 6, characterized in that: The control parameters in the calculation formula for the opening degree K1 of the first electronic control valve (30) include the tube temperature T 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 change periodically.

8. The control method according to claim 7, characterized in that: The change period of the control parameter is t0, wherein the value range of t0 is 5s to 60s.

9. The control method according to claim 7, characterized in that: The control parameter is based on the operating frequency F of the compressor (20) 频 The change amount changes periodically, and the operating frequency F 频 The change in value exceeds the fifth preset value F k , the control parameter changes periodically, wherein the fifth preset value F k The value range is 2Hz~10Hz.

10. The control method according to claim 2, characterized in that: When the air conditioner operates 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 operates the first working mode, the first electronic control valve (30) is opened and closed 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 opened and closed according to the second control logic.

11. The control method according to any one of claims 1 to 6, characterized in that: When the air conditioner operates in the first working mode, the exhaust port of the compressor (20) is communicated with 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 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 air intake port of the compressor (20) through the switching of the four-way valve (60); and / or, When the air conditioner operates 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 air intake port of the compressor (20) through the switching of the four-way valve (60).

12. The control method according to claim 11, characterized in that: A second electronic control valve (70) is provided on the connecting pipeline between the outdoor heat exchanger (50) and the flash evaporator (10); and / or, A third electronic control valve (80) is provided on the communication pipeline between the flash evaporator (10) and the indoor heat exchanger (40).

Images