Air conditioner heating steady state control system and method and air conditioner

Abstract

The invention relates to the technical field of air conditioners, and provides an air conditioner heating steady state control system and method and an air conditioner, the air conditioner heating steady state control system comprises a compressor, an outdoor heat exchanger, a temperature sensor and a controller, the liquid inlet end of the outdoor heat exchanger is connected with an exhaust port of the compressor through a bypass branch, and the bypass branch is provided with a flow adjusting valve; the temperature sensor is arranged at the liquid inlet end of the outdoor heat exchanger and used for detecting the liquid inlet temperature of the outdoor heat exchanger under the condition that the air conditioner operates in a heating mode. The controller is connected with the temperature sensor and the flow adjusting valve and used for determining that the liquid inlet temperature of the outdoor heat exchanger is larger than the set defrosting temperature and synchronously controlling the opening degree of the flow adjusting valve and the detection period of the liquid inlet temperature according to the difference value between the liquid inlet temperature of the outdoor heat exchanger and the set defrosting temperature through the control precision change strategy. The frosting phenomenon of the air conditioner can be reduced, frequent defrosting of the air conditioner is prevented, the heating stability of the air conditioner is guaranteed, and the user experience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioning heating steady-state control system, method and air conditioner. Background Art

[0002] In the related art, the outdoor heat exchanger of the top-outlet outdoor unit of the air conditioner is located on the chassis. Since the wind field near the refrigerant flow path at the bottom of the outdoor heat exchanger is very poor and the heat exchange is also relatively poor, the refrigerant flow path at the bottom of the outdoor heat exchanger is often not defrosted cleanly during defrosting in heating conditions. With long-term operation, it will gradually freeze from the bottom and finally spread to the entire heat exchanger, resulting in poor heat exchange effect of the entire heat exchanger, shortened defrost cycle, increased defrost time, and frequent defrosting, which affects the user experience. Summary of the invention

[0003] The present invention provides an air conditioning heating steady-state control system, method and air conditioner, which can effectively reduce the frosting phenomenon of the air conditioner, prevent the air conditioner from being frequently defrosted, and improve the defrosting condition of the outdoor heat exchanger, thereby ensuring the heating stability of the air conditioner and improving the user experience.

[0004] The present invention provides an air conditioning heating steady-state control system, comprising:

[0005] compressor;

[0006] An outdoor heat exchanger, wherein the liquid inlet end of the outdoor heat exchanger is connected to the exhaust port of the compressor via a bypass branch, and the bypass branch is provided with a flow regulating valve;

[0007] A temperature sensor is provided at the liquid inlet end of the outdoor heat exchanger, and is used to detect the liquid inlet temperature of the outdoor heat exchanger when the air conditioner is in heating operation;

[0008] A controller is connected to the temperature sensor and the flow regulating valve, and is used to determine that the inlet liquid temperature of the outdoor heat exchanger is greater than the set defrost temperature. According to the difference between the inlet liquid temperature of the outdoor heat exchanger and the set defrost temperature, a control accuracy change strategy is adopted to synchronously control the opening of the flow regulating valve and the detection period of the inlet liquid temperature.

[0009] An air conditioning heating steady-state control system provided by the present invention also includes:

[0010] An indoor heat exchanger connected to the liquid inlet end of the outdoor heat exchanger;

[0011] A four-way valve, wherein a first valve port of the four-way valve is connected to the exhaust port of the compressor, a second valve port of the four-way valve is connected to the indoor heat exchanger, a third valve port of the four-way valve is connected to the outlet end of the outdoor heat exchanger, and a fourth valve port of the four-way valve is connected to the suction port of the compressor.

[0012] According to an air conditioning heating steady-state control system provided by the present invention, the fourth valve port of the four-way valve is connected to the air intake port of the compressor via a gas-liquid separator.

[0013] According to an air conditioning heating steady-state control system provided by the present invention, a throttle valve is provided between the temperature sensor and the indoor heat exchanger.

[0014] According to an air conditioning heating steady-state control system provided by the present invention, the flow regulating valve is an electronic expansion valve.

[0015] The present invention also provides a method for controlling the heating of an air conditioner in a steady state, wherein the exhaust port of the compressor is connected to the liquid inlet end of the outdoor heat exchanger via a bypass branch, and the bypass branch is provided with a flow regulating valve; the method comprises:

[0016] When the air conditioner is in heating operation, detecting the liquid inlet temperature of the outdoor heat exchanger;

[0017] Determine that the inlet liquid temperature of the outdoor heat exchanger is greater than the set defrost temperature, and according to the difference between the inlet liquid temperature of the outdoor heat exchanger and the set defrost temperature, adopt a control accuracy change strategy to synchronously control the opening of the flow control valve and the detection period of the inlet liquid temperature.

[0018] According to a method for controlling heating steady state of an air conditioner provided by the present invention, the step of synchronously controlling the opening of the flow regulating valve and the detection period of the inlet liquid temperature by adopting a control accuracy variation strategy according to the difference between the inlet liquid temperature of the outdoor heat exchanger and the set defrost temperature comprises:

[0019] The greater the difference between the inlet temperature of the outdoor heat exchanger and the set defrost temperature, the smaller the opening of the flow control valve and the longer the detection period of the inlet temperature.

[0020] The smaller the difference between the inlet liquid temperature of the outdoor heat exchanger and the set defrost temperature, the larger the opening of the flow regulating valve is, and the shorter the detection period of the inlet liquid temperature is.

[0021] According to a method for controlling heating steady state of an air conditioner provided by the present invention, the step of synchronously controlling the opening of the flow regulating valve and the detection period of the inlet liquid temperature by adopting a control accuracy variation strategy according to the difference between the inlet liquid temperature of the outdoor heat exchanger and the set defrost temperature specifically comprises:

[0022] Determine that the difference between the inlet temperature of the outdoor heat exchanger and the set defrost temperature reaches a first preset value, control the opening of the flow control valve to be the first preset opening, and the detection period is the first preset period;

[0023] Determine that the difference between the inlet temperature of the outdoor heat exchanger and the set defrost temperature reaches a second preset value, control the opening of the flow control valve to be the second preset opening, and the detection period is the second preset period;

[0024] Determine that the difference between the inlet temperature of the outdoor heat exchanger and the set defrost temperature reaches a third preset value, control the opening of the flow control valve to be the third preset opening, and the detection period is the third preset period;

[0025] Among them, the first preset value is greater than the second preset value, and the second preset value is greater than the third preset value; the first preset opening is smaller than the second preset opening, and the second preset opening is smaller than the third preset opening; the first preset period is greater than the second preset period, and the second preset period is greater than the third preset period.

[0026] According to the present invention, a method for controlling heating of an air conditioner in a steady state further comprises:

[0027] Determine that the difference between the inlet liquid temperature of the outdoor heat exchanger and the set defrost temperature reaches a fourth preset value, control the flow regulating valve to close, and the detection period of the inlet liquid temperature is the fourth preset period;

[0028] The fourth preset value is greater than the first preset value, and the fourth preset period is greater than the first preset period.

[0029] The present invention also provides an air conditioner, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned air conditioning heating steady-state control method when executing the program.

[0030] The air-conditioning heating steady-state control system, method and air conditioner provided by the present invention are connected with the exhaust port of the compressor through the liquid inlet end of the outdoor heat exchanger via a bypass branch, so that a small amount of high-temperature and high-pressure refrigerant discharged from the compressor can be directed to the outdoor heat exchanger for heating, and the bypass branch is provided with a flow regulating valve, so that the refrigerant flow rate can be continuously adjusted without affecting the user experience; a temperature sensor is arranged at the liquid inlet end of the outdoor heat exchanger, so that the inlet liquid temperature of the outdoor heat exchanger can be detected when the air-conditioning heating is running; a controller is connected with the temperature sensor and the flow regulating valve, so that when it is determined that the inlet liquid temperature of the outdoor heat exchanger is greater than the set defrost temperature, according to the difference between the inlet liquid temperature of the outdoor heat exchanger and the set defrost temperature, a control accuracy change strategy is adopted to synchronously control the opening of the flow regulating valve and the detection cycle of the inlet liquid temperature, so as to achieve the effect of accurate and rapid adjustment, effectively reduce the frosting phenomenon of the air conditioner, prevent the air conditioner from being frequently defrosted, and improve the defrosting condition of the outdoor heat exchanger, thereby ensuring the heating stability of the air conditioner and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a structural schematic diagram of the air conditioning heating steady-state control system provided by the present invention;

[0033] Figure 2 It is a flow chart of the air conditioning heating steady-state control method provided by the present invention;

[0034] Figure 3 It is a structural schematic diagram of the air conditioner provided by the present invention.

[0035] Reference numerals:

[0036] 101: compressor; 102: outdoor heat exchanger; 103: temperature sensor;

[0037] 104: bypass branch; 105: flow control valve; 106: main road;

[0038] 107: indoor heat exchanger; 108: four-way valve; 109: gas-liquid separator;

[0039] 110: throttle valve;

[0040] 301: processor; 302: communication interface;

[0041] 303: memory; 304: communication bus. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. 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.

[0043] In the description of the embodiments of the present invention, it should be noted that the terms “first”, “second”, etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0044] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0046] Combine the following Figure 1-Figure 3 The present invention describes an air conditioning heating steady-state control system, method and air conditioner.

[0047] According to an embodiment of the first aspect of the present invention, referring to Figure 1 As shown, the air conditioning heating steady-state control system provided by the present invention mainly includes: a compressor 101, an outdoor heat exchanger 102, a temperature sensor 103 and a controller.

[0048] The liquid inlet end of the outdoor heat exchanger 102 is connected to the exhaust port of the compressor 101 via a bypass branch 104, and the bypass branch 104 is provided with a flow regulating valve 105. Specifically, a small amount of high-temperature and high-pressure refrigerant discharged from the compressor 101 can be passed to the outdoor heat exchanger 102 for heating through the bypass branch 104, and the refrigerant flow can be continuously adjusted through the flow regulating valve 105 without affecting the user experience, thereby improving the defrosting condition of the outdoor heat exchanger 102.

[0049] The temperature sensor 103 is disposed at the liquid inlet end of the outdoor heat exchanger 102 and is used to detect the liquid inlet temperature of the outdoor heat exchanger 102 when the air conditioner is in heating operation.

[0050] The controller is respectively connected to the temperature sensor 103 and the flow regulating valve 105, and is used to determine that the inlet liquid temperature of the outdoor heat exchanger 102 is greater than the set defrost temperature. According to the difference between the inlet liquid temperature of the outdoor heat exchanger 102 and the set defrost temperature, a control accuracy change strategy is adopted to synchronously control the opening of the flow regulating valve 105 and the detection cycle of the inlet liquid temperature.

[0051] When the air conditioner is started and operated in heating mode, the inlet liquid temperature of the outdoor heat exchanger 102 is detected by the temperature sensor 103, and the detected inlet liquid temperature of the outdoor heat exchanger 102 is sent to the controller for processing. The controller compares the detected inlet liquid temperature of the outdoor heat exchanger 102 with the set defrost temperature. When the inlet liquid temperature of the outdoor heat exchanger 102 is greater than the set defrost temperature, it means that the outdoor heat exchanger 102 has not yet reached the defrost condition. That is, before the air conditioner enters the defrost mode, the present invention draws out a bypass branch 104 from the high-pressure side of the compressor 101 to divert a small amount of high-temperature refrigerant. By executing a control accuracy change strategy, the flow of high-temperature refrigerant sent to the outdoor heat exchanger 102 is continuously and accurately adjusted without affecting the user experience, thereby improving the defrost condition of the outdoor heat exchanger 102 and enabling the air conditioner to achieve the purpose of steady-state heating.

[0052] Specifically, the greater the difference between the inlet liquid temperature of the outdoor heat exchanger 102 and the set defrost temperature, the smaller the opening of the flow regulating valve 105 and the longer the detection cycle of the inlet liquid temperature; the smaller the difference between the inlet liquid temperature of the outdoor heat exchanger 102 and the set defrost temperature, the greater the opening of the flow regulating valve 105 and the shorter the detection cycle of the inlet liquid temperature.

[0053] The greater the difference between the inlet liquid temperature of the outdoor heat exchanger 102 and the set defrost temperature, the farther the outdoor heat exchanger 102 is from entering the defrost. At this time, the opening of the flow regulating valve 105 can be reduced to reduce the refrigerant flow of the compressor 101 into the outdoor heat exchanger 102 through the bypass branch 104, so that more refrigerant of the compressor 101 can participate in the main circulation, thereby improving the heating effect. At this time, the detection time interval for the inlet liquid temperature can be longer, without frequent detection, to achieve rough precision adjustment.

[0054] Similarly, when the difference between the inlet liquid temperature of the outdoor heat exchanger 102 and the set defrost temperature is smaller, it means that the outdoor heat exchanger 102 is closer to entering the defrost. At this time, the opening of the flow regulating valve 105 can be increased to increase the refrigerant flow of the compressor 101 into the outdoor heat exchanger 102 through the bypass branch 104. At this time, the detection time interval for the inlet liquid temperature can be shorter, and frequent detection can be performed to increase the detection control frequency and speed up the control speed, so as to prevent the air conditioner from entering the defrost without affecting the heating effect as much as possible, ensure the stability of the air conditioner heating, and achieve fine precision regulation.

[0055] The air conditioning heating steady-state control system provided in the embodiment of the present invention can achieve step-by-step adjustment from coarse to fine by continuously adjusting the high-temperature refrigerant to enter the outdoor heat exchanger 102 when the air conditioning is in heating operation, and adopts a control accuracy change strategy of synchronously adjusting the valve opening and the detection time. When the temperature difference is large, the adjustment is accurate, and when the temperature difference is small, the adjustment is rapid, thereby enabling the air conditioner to reach a steady-state heating state and effectively ensuring the user experience.

[0056] Therefore, the air conditioning heating steady-state control system provided in the embodiment of the present invention can effectively reduce the frosting phenomenon of the air conditioner, prevent the air conditioner from being frequently defrosted, and improve the defrosting condition of the outdoor heat exchanger 102, thereby ensuring the stability of the air conditioning heating and improving the user experience.

[0057] According to one embodiment of the present invention, referring to Figure 1 As shown, the air conditioning heating steady-state control system of the present invention also includes: an indoor heat exchanger 107 and a four-way valve 108, the indoor heat exchanger 107 is connected to the liquid inlet end of the outdoor heat exchanger 102; the first valve port of the four-way valve 108 is connected to the exhaust port of the compressor 101, the second valve port of the four-way valve 108 is connected to the indoor heat exchanger 107, the third valve port of the four-way valve 108 is connected to the outlet end of the outdoor heat exchanger 102, the fourth valve port of the four-way valve 108 is connected to the suction port of the compressor 101, and the four-way valve 108 is used to switch the operating mode of the air conditioner.

[0058] It can be understood that the compressor 101 , the four-way valve 108 , the indoor heat exchanger 107 , the outdoor heat exchanger 102 and other components are cyclically connected via the main path 106 .

[0059] Specifically, when the air conditioner is in heating mode, most of the high-temperature and high-pressure refrigerant discharged from the compressor 101 flows through the first valve port and the second valve port of the four-way valve 108 to the indoor heat exchanger 107 to condense and release heat, and the condensed refrigerant enters the outdoor heat exchanger 102 to evaporate and absorb heat. At the same time, another small amount of high-temperature and high-pressure refrigerant discharged from the compressor 101 can be sent to the outdoor heat exchanger 102 through the bypass branch 104, and then flow back to the compressor 101 through the third valve port and the fourth valve port of the four-way valve 108.

[0060] According to one embodiment of the present invention, referring to Figure 1 As shown, the fourth valve port of the four-way valve 108 is connected to the air intake port of the compressor 101 through the gas-liquid separator 109 to prevent liquid hammer, thereby achieving the purpose of protecting the compressor 101.

[0061] In addition, a throttle valve 110 is provided between the temperature sensor 103 and the indoor heat exchanger 107. Specifically, the temperature sensor 103 is provided between the outdoor heat exchanger 102 and the throttle valve 110, a first end of the bypass branch 104 is connected to the exhaust port of the compressor 101, and a second end of the bypass branch 104 is connected between the outdoor heat exchanger 102 and the temperature sensor 103.

[0062] The specific type of the flow regulating valve 105 in the embodiment of the present invention is not particularly limited, as long as it can play a role in regulating the flow of the refrigerant. For example, the flow regulating valve 105 can be an electronic expansion valve.

[0063] The air conditioning heating steady-state control method provided by the present invention is described below. The air conditioning heating steady-state control method described below and the air conditioning heating steady-state control system described above can be referred to each other.

[0064] According to an embodiment of the second aspect of the present invention, referring to Figure 2 As shown, the present invention also provides a method for controlling the steady state heating of an air conditioner, wherein the exhaust port of the compressor 101 is connected to the liquid inlet end of the outdoor heat exchanger 102 via a bypass branch 104, and the bypass branch 104 is provided with a flow regulating valve 105; the method mainly comprises the following steps:

[0065] S201, when the air conditioner is in heating operation, detecting the liquid inlet temperature of the outdoor heat exchanger 102;

[0066] S202, determine that the inlet liquid temperature of the outdoor heat exchanger 102 is greater than the set defrost temperature, and according to the difference between the inlet liquid temperature of the outdoor heat exchanger 102 and the set defrost temperature, adopt a control accuracy change strategy to synchronously control the opening of the flow control valve 105 and the detection period of the inlet liquid temperature.

[0067] Among them, according to the difference between the inlet temperature of the outdoor heat exchanger 102 and the set defrost temperature, the step of adopting the control accuracy change strategy to synchronously control the opening of the flow control valve 105 and the detection cycle of the inlet temperature includes:

[0068] The greater the difference between the inlet temperature of the outdoor heat exchanger 102 and the set defrost temperature, the smaller the opening of the flow control valve 105 is, and the longer the detection cycle of the inlet temperature is;

[0069] The smaller the difference between the inlet liquid temperature of the outdoor heat exchanger 102 and the set defrost temperature, the larger the opening of the flow control valve 105 is, and the shorter the detection cycle of the inlet liquid temperature is.

[0070] Specifically, the greater the difference between the inlet liquid temperature of the outdoor heat exchanger 102 and the set defrost temperature, the farther the outdoor heat exchanger 102 is from entering the defrost. At this time, the opening of the flow regulating valve 105 can be reduced to reduce the refrigerant flow of the compressor 101 flowing into the outdoor heat exchanger 102 through the bypass branch, so that more refrigerant of the compressor 101 can participate in the main circulation, thereby improving the heating effect. At this time, the detection time interval for the inlet liquid temperature can be longer, without frequent detection, to achieve rough precision adjustment.

[0071] When the difference between the inlet liquid temperature of the outdoor heat exchanger 102 and the set defrost temperature is smaller, it means that the outdoor heat exchanger 102 is closer to entering the defrost. At this time, the opening of the flow regulating valve 105 can be increased to increase the refrigerant flow of the compressor 101 into the outdoor heat exchanger 102 through the bypass branch 104. At this time, the detection time interval for the inlet liquid temperature can be shorter, and frequent detection can be carried out to speed up the control speed, thereby preventing the air conditioner from entering the defrost without affecting the heating effect as much as possible, ensuring the stability of the air conditioner heating and achieving fine precision adjustment.

[0072] Therefore, the air conditioning heating steady-state control method provided in the embodiment of the present invention, by adopting a control accuracy change strategy, begins to continuously adjust the high-temperature refrigerant to enter the outdoor heat exchanger 102 when the heating mode is turned on, which can effectively reduce the frosting phenomenon of the air conditioner, prevent the air conditioner from being frequently defrosted, and improve the defrosting condition of the outdoor heat exchanger 102, thereby ensuring the stability of the air conditioning heating and improving the user experience.

[0073] According to one embodiment of the present invention, according to the difference between the inlet temperature of the outdoor heat exchanger 102 and the set defrost temperature, the steps of synchronously controlling the opening of the flow control valve 105 and the detection cycle of the inlet temperature by using a control accuracy change strategy specifically include:

[0074] Determine that the difference between the inlet temperature of the outdoor heat exchanger 102 and the set defrost temperature reaches a first preset value, control the opening of the flow control valve 105 to be the first preset opening, and the detection period is the first preset period;

[0075] Determine that the difference between the inlet temperature of the outdoor heat exchanger 102 and the set defrost temperature reaches a second preset value, control the opening of the flow control valve 105 to be the second preset opening, and the detection period is the second preset period;

[0076] Determine that the difference between the inlet temperature of the outdoor heat exchanger 102 and the set defrost temperature reaches a third preset value, control the opening of the flow control valve 105 to be the third preset opening, and the detection period is the third preset period;

[0077] Among them, the first preset value is greater than the second preset value, and the second preset value is greater than the third preset value; the first preset opening is smaller than the second preset opening, and the second preset opening is smaller than the third preset opening, and the preset opening is an empirical setting value that basically does not affect normal heating; the first preset period is greater than the second preset period, and the second preset period is greater than the third preset period.

[0078] Therefore, the air conditioning heating steady-state control method provided in the embodiment of the present invention can realize the step-by-step adjustment of the opening of the flow regulating valve 105 from coarse to fine, and accurately control the refrigerant flow of the bypass branch 104, thereby improving the defrosting condition of the outdoor heat exchanger 102 without affecting the user experience, and keeping the air conditioner in a heating steady state.

[0079] According to one embodiment, the air conditioning heating steady-state control method of the present invention further includes:

[0080] Determine that the difference between the inlet liquid temperature of the outdoor heat exchanger 102 and the set defrost temperature reaches a fourth preset value, control the flow regulating valve 105 to close, and the detection period of the inlet liquid temperature is the fourth preset period;

[0081] The fourth preset value is greater than the first preset value, and the fourth preset period is greater than the first preset period.

[0082] Specifically, when the difference between the inlet liquid temperature of the outdoor heat exchanger 102 and the set defrost temperature reaches the fourth preset value, it means that there is no risk of frost on the outdoor heat exchanger 102. At this time, the flow regulating valve 105 can be controlled to close so that all the refrigerant of the compressor 101 can participate in the main circulation, thereby improving the heating effect. At this time, the detection time interval for the inlet liquid temperature can be longer, without the need for frequent detection, thereby optimizing the control process.

[0083] According to an embodiment of the third aspect of the present invention, referring to Figure 3 As shown, the present invention also provides an air conditioner, which may include: a processor 301, a communications interface 302, a memory 303 and a communication bus 304, wherein the processor 301, the communications interface 302 and the memory 303 communicate with each other through the communication bus 304. The processor 301 may call the logic instructions in the memory 303 to execute the air conditioning heating steady-state control method, which includes: in the case of air conditioning heating operation, detecting the inlet liquid temperature of the outdoor heat exchanger 102; determining that the inlet liquid temperature of the outdoor heat exchanger 102 is greater than the set defrosting temperature, and according to the difference between the inlet liquid temperature of the outdoor heat exchanger 102 and the set defrosting temperature, using a control accuracy change strategy to synchronously control the opening of the flow control valve 105 and the detection cycle of the inlet liquid temperature.

[0084] In addition, the logic instructions in the above-mentioned memory 303 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0085] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the air conditioning heating steady-state control method provided by the above methods, the method including: when the air conditioning heating is running, detecting the inlet liquid temperature of the outdoor heat exchanger 102; determining that the inlet liquid temperature of the outdoor heat exchanger 102 is greater than the set defrost temperature, and according to the difference between the inlet liquid temperature of the outdoor heat exchanger 102 and the set defrost temperature, adopting a control accuracy change strategy to synchronously control the opening of the flow control valve 105 and the detection cycle of the inlet liquid temperature.

[0086] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the air conditioning heating steady-state control method provided by the above-mentioned methods, the method comprising: when the air conditioning heating is running, detecting the inlet liquid temperature of the outdoor heat exchanger 102; determining that the inlet liquid temperature of the outdoor heat exchanger 102 is greater than the set defrost temperature, and according to the difference between the inlet liquid temperature of the outdoor heat exchanger 102 and the set defrost temperature, adopting a control accuracy change strategy to synchronously control the opening of the flow regulating valve 105 and the detection cycle of the inlet liquid temperature.

[0087] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0088] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air conditioning heating steady-state control system, It is characterized in that include: compressor; An outdoor heat exchanger, wherein the liquid inlet end of the outdoor heat exchanger is connected to the exhaust port of the compressor via a bypass branch, and the bypass branch is provided with a flow regulating valve; A temperature sensor is provided at the liquid inlet end of the outdoor heat exchanger, and is used to detect the liquid inlet temperature of the outdoor heat exchanger when the air conditioner is in heating operation; A controller is connected to the temperature sensor and the flow regulating valve, and is used to determine that the inlet liquid temperature of the outdoor heat exchanger is greater than the set defrost temperature. According to the difference between the inlet liquid temperature of the outdoor heat exchanger and the set defrost temperature, a control accuracy change strategy is adopted to synchronously control the opening of the flow regulating valve and the detection period of the inlet liquid temperature.

2. The air conditioning heating steady-state control system according to claim 1, It is characterized in that Also includes: An indoor heat exchanger connected to the liquid inlet end of the outdoor heat exchanger; A four-way valve, wherein a first valve port of the four-way valve is connected to the exhaust port of the compressor, a second valve port of the four-way valve is connected to the indoor heat exchanger, a third valve port of the four-way valve is connected to the outlet end of the outdoor heat exchanger, and a fourth valve port of the four-way valve is connected to the suction port of the compressor.

3. The air conditioning heating steady-state control system according to claim 2, It is characterized in that The fourth valve port of the four-way valve is connected to the air intake port of the compressor via a gas-liquid separator.

4. The air conditioning heating steady-state control system according to claim 2, It is characterized in that A throttle valve is provided between the temperature sensor and the indoor heat exchanger.

5. The air conditioning heating steady-state control system according to any one of claims 1 to 4, It is characterized in that The flow regulating valve is an electronic expansion valve.

6. A method for controlling the heating of an air conditioner in a steady state. It is characterized in that The exhaust port of the compressor is connected to the liquid inlet end of the outdoor heat exchanger via a bypass branch, and the bypass branch is provided with a flow regulating valve; the method comprises: When the air conditioner is in heating operation, detecting the liquid inlet temperature of the outdoor heat exchanger; Determine that the inlet liquid temperature of the outdoor heat exchanger is greater than the set defrost temperature, and according to the difference between the inlet liquid temperature of the outdoor heat exchanger and the set defrost temperature, adopt a control accuracy change strategy to synchronously control the opening of the flow control valve and the detection period of the inlet liquid temperature.

7. The air conditioning heating steady-state control method according to claim 6, It is characterized in that The step of synchronously controlling the opening of the flow regulating valve and the detection period of the inlet liquid temperature by adopting a control accuracy variation strategy according to the difference between the inlet liquid temperature of the outdoor heat exchanger and the set defrost temperature comprises: The greater the difference between the inlet temperature of the outdoor heat exchanger and the set defrost temperature, the smaller the opening of the flow control valve and the longer the detection period of the inlet temperature. The smaller the difference between the inlet liquid temperature of the outdoor heat exchanger and the set defrost temperature, the larger the opening of the flow regulating valve is, and the shorter the detection period of the inlet liquid temperature is.

8. The air conditioning heating steady-state control method according to claim 6, It is characterized in that The step of synchronously controlling the opening of the flow control valve and the detection period of the inlet liquid temperature by adopting a control accuracy variation strategy according to the difference between the inlet liquid temperature of the outdoor heat exchanger and the set defrost temperature specifically includes: Determine that the difference between the inlet temperature of the outdoor heat exchanger and the set defrost temperature reaches a first preset value, control the opening of the flow control valve to be the first preset opening, and the detection period is the first preset period; Determine that the difference between the inlet temperature of the outdoor heat exchanger and the set defrost temperature reaches a second preset value, control the opening of the flow control valve to be the second preset opening, and the detection period is the second preset period; Determine that the difference between the inlet temperature of the outdoor heat exchanger and the set defrost temperature reaches a third preset value, control the opening of the flow control valve to be the third preset opening, and the detection period is the third preset period; Among them, the first preset value is greater than the second preset value, and the second preset value is greater than the third preset value; the first preset opening is smaller than the second preset opening, and the second preset opening is smaller than the third preset opening; the first preset period is greater than the second preset period, and the second preset period is greater than the third preset period.

9. The air conditioning heating steady-state control method according to claim 8, It is characterized in that Also includes: Determine that the difference between the inlet liquid temperature of the outdoor heat exchanger and the set defrost temperature reaches a fourth preset value, control the flow regulating valve to close, and the detection period of the inlet liquid temperature is the fourth preset period; The fourth preset value is greater than the first preset value, and the fourth preset period is greater than the first preset period.

10. An air conditioner comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, It is characterized in that When the processor executes the program, the air conditioning heating steady-state control method according to any one of claims 6 to 9 is implemented.

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