An air conditioner and an automatic cleaning control method of the air conditioner

Abstract

The application discloses an air conditioner and an automatic cleaning control method thereof. When a preset self-cleaning instruction is received, the air conditioner is controlled to run in a refrigeration mode according to target operation parameters, so that the indoor heat exchanger condenses dew; after the air conditioner runs for a first preset time length, the air conditioner is controlled to enter a frosting stage, a second preset time length is taken as an adjustment period, the coil temperature of the indoor heat exchanger at the initial time and the end time of the current adjustment period is acquired, and the coil temperature reduction rate of the indoor heat exchanger is calculated; according to the comparison relationship between the coil temperature reduction rate and a preset temperature reduction rate threshold, the current operation parameters of the air conditioner in the next adjustment period are adjusted, so that the indoor heat exchanger frosts; when a preset frosting completion condition is met, the air conditioner is controlled to enter a defrosting stage. By using the application, the frosting efficiency of the indoor heat exchanger of the air conditioner in the self-cleaning process can be effectively improved, and the cleaning efficiency of the self-cleaning is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air conditioning technology, and in particular to an air conditioner and a self-cleaning control method of the air conditioner. BACKGROUND

[0002] After long-term use, a large amount of dust will enter the heat exchanger of the air conditioner, causing the heat exchanger to be covered with dust, and a large number of bacteria will also breed on the heat exchanger, which not only reduces the heat exchange performance of the heat exchanger, but also causes negative problems to the health of users, so it is necessary to regularly clean the heat exchanger.

[0003] At present, the air conditioner achieves the cleaning effect of the evaporator by running the self-cleaning mode to peel off and discharge the deposits on the fins. However, the inventors have found that the existing technology at least has the following problems: the control logic of the general self-cleaning mode of the air conditioner only simply switches the air conditioning system between the cooling mode and the heating mode to complete the frosting and defrosting process, and due to the single and unreasonable parameter setting, it often has the disadvantages of poor self-cleaning effect, long self-cleaning time, and large power consumption. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide an air conditioner and an automatic cleaning control method of the air conditioner, which can effectively improve the condensation and frosting effect of the indoor heat exchanger of the air conditioner in the self-cleaning process, thereby improving the cleaning efficiency and operation efficiency of the self-cleaning.

[0005] To achieve the above-mentioned purpose, the embodiments of the present application provide an air conditioner, comprising:

[0006] a refrigerant circuit, in which a refrigerant circulates sequentially through a compressor, a condenser, an expansion valve, and an evaporator, one of the condenser and the evaporator being an outdoor heat exchanger, and the other being an indoor heat exchanger;

[0007] an indoor fan for driving indoor air to exchange heat with the indoor heat exchanger and then send out from an air outlet;

[0008] an outdoor fan for driving outdoor air to exchange heat with the outdoor heat exchanger;

[0009] a controller for:

[0010] when receiving a preset self-cleaning instruction, determining a target operating parameter of the air conditioner, and controlling the air conditioner to run in a cooling mode according to the target operating parameter to make the indoor heat exchanger condense dew;

[0011] after the air conditioner runs for a first preset time length, controlling the air conditioner to enter a frosting stage, taking a second preset time length as an adjustment period, obtaining the coil temperature of the indoor heat exchanger at the initial time and the end time of the current adjustment period to calculate the coil temperature drop rate of the indoor heat exchanger;

[0012] According to the comparison relationship between the coil temperature drop rate and the preset temperature drop rate threshold, the current operating parameter of the air conditioner in the next adjustment period is adjusted to make the indoor heat exchanger frost;

[0013] When the preset frost completion condition is met, the air conditioner is controlled to enter the defrosting phase.

[0014] As an improvement of the above scheme, the operating parameters of the air conditioner include the operating frequency of the compressor and the operating speed of the outdoor fan;

[0015] According to the comparison relationship between the coil temperature drop rate and the preset temperature drop rate threshold, the current operating parameter of the air conditioner in the next adjustment period is adjusted, specifically including:

[0016] When the coil temperature drop rate is less than or equal to the temperature drop rate threshold, in the next adjustment period, the current operating frequency of the compressor is increased by a preset frequency adjustment step, and the current operating speed of the outdoor fan is increased by a preset speed adjustment step;

[0017] When the coil temperature drop rate is greater than the temperature drop rate threshold, in the next adjustment period, the current operating frequency of the compressor and the current operating speed of the outdoor fan are maintained unchanged.

[0018] As an improvement of the above scheme, the operating parameters of the air conditioner include the operating frequency of the compressor and the operating speed of the outdoor fan;

[0019] The target operating parameters of the air conditioner are determined, and the air conditioner is controlled to run in the refrigeration mode according to the target operating parameters to make the indoor heat exchanger condense dew, specifically including:

[0020] The current environmental parameters are obtained; wherein the environmental parameters include indoor environmental temperature, indoor environmental humidity and outdoor environmental humidity;

[0021] According to the preset corresponding relationship between the environmental parameters and the operating frequency of the compressor and the operating speed of the outdoor fan, the operating frequency of the compressor and the operating speed of the outdoor fan corresponding to the current environmental parameters are determined as the target operating frequency and the target operating speed respectively;

[0022] The air conditioner is controlled to enter the refrigeration mode, the compressor operates at the target operating frequency, and the outdoor fan operates at the target operating speed.

[0023] As an improvement of the above scheme, the air outlet is further provided with a transverse air deflector and a longitudinal air deflector, the transverse air deflector is used to adjust the up-down air supply direction, and the longitudinal air deflector is used to adjust the left-right air supply direction; the operation parameters of the air conditioner further include swing angles of the transverse air deflector and the longitudinal air deflector;

[0024] The determination of the target operation parameters of the air conditioner and the control of the air conditioner to run in the refrigeration mode according to the target operation parameters to cause the condensation of the indoor heat exchanger further include:

[0025] The upper limit swing angle of the transverse air deflector is determined as a first target swing angle, and the left limit swing angle or the right limit swing angle of the longitudinal air deflector is determined as a second target swing angle;

[0026] The transverse air deflector is controlled to swing to the first target swing angle, and the longitudinal air deflector is controlled to swing to the second target swing angle.

[0027] As an improvement of the above scheme, the preset frost completion condition is that the coil temperature of the indoor heat exchanger is less than or equal to a preset first coil temperature threshold; or, the time length of the air conditioner in the frost stage reaches a third preset time length.

[0028] As an improvement of the above scheme, the defrosting stage includes a first defrosting stage and a second defrosting stage; and the control of the air conditioner to enter the defrosting stage when the preset frost completion condition is met specifically includes:

[0029] The compressor and the outdoor fan are controlled to stop running when the preset frost completion condition is met;

[0030] After the compressor and the outdoor fan stop running, the air conditioner is controlled to enter the first defrosting stage; wherein the first defrosting stage adopts a natural defrosting mode of circulating air supply;

[0031] When the time length of the air conditioner in the first defrosting stage reaches a fourth preset time length, the air conditioner is controlled to enter the second defrosting stage; wherein the second defrosting stage adopts a heating defrosting mode.

[0032] As an improvement of the above scheme, in the first defrosting stage, the indoor fan starts running at a preset first running speed, and the opening degree of the expansion valve is adjusted to a preset maximum opening degree;

[0033] In the second defrosting stage, the indoor fan is controlled to stop running, the air conditioner is controlled to enter a heating mode, the compressor runs at a preset running frequency, the outdoor fan runs at a preset highest running speed, and the opening degree of the expansion valve is adjusted to a preset opening value.

[0034] As an improvement of the above-mentioned scheme, after the air conditioner is controlled to enter the defrosting phase when the preset defrosting completion condition is met, the controller is further configured to:

[0035] control the air conditioner to enter a drying phase when a preset drying completion condition is met; in the drying phase, the compressor and the outdoor fan are controlled to stop running, the indoor fan is controlled to start running at a preset second running speed and stop running after running for a fifth preset time length.

[0036] The defrosting completion condition is that the coil temperature of the indoor heat exchanger reaches a preset second coil temperature threshold, or the discharge pressure of the compressor is greater than or equal to a preset pressure threshold.

[0037] As an improvement of the above-mentioned scheme, when a preset self-cleaning instruction is received, before the target running parameter of the air conditioner is determined and the air conditioner is controlled to run in the refrigeration mode according to the target running parameter, the controller is further configured to:

[0038] determine the current running mode of the air conditioner; the running mode is standby mode, air supply mode, refrigeration mode, dehumidification mode or heating mode.

[0039] When the current running mode of the air conditioner is standby mode or heating mode, the compressor and the outdoor fan are controlled to stop running, the indoor fan is controlled to run at a preset third running speed, and then the step of determining the target running parameter of the air conditioner and controlling the air conditioner to run in the refrigeration mode according to the target running parameter is performed.

[0040] When the current running mode of the air conditioner is air supply mode, refrigeration mode or dehumidification mode, the step of determining the target running parameter of the air conditioner and controlling the air conditioner to run in the refrigeration mode according to the target running parameter is performed.

[0041] The embodiment of the application also provides an automatic cleaning control method of an air conditioner,

[0042] The air conditioner comprises:

[0043] a refrigerant circuit, in which a refrigerant circulates through a compressor, a condenser, an expansion valve and an evaporator in sequence, one of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger;

[0044] an indoor fan, configured to drive indoor air to exchange heat with the indoor heat exchanger and then be sent out from an air outlet;

[0045] an outdoor fan, configured to drive outdoor air to exchange heat with the outdoor heat exchanger;

[0046] The method comprises:

[0047] When a preset self-cleaning instruction is received, a target operating parameter of the air conditioner is determined, and the air conditioner is controlled to run in a refrigeration mode according to the target operating parameter, so that the indoor heat exchanger is condensed;

[0048] After the air conditioner runs for a first preset time length, the air conditioner is controlled to enter a frosting stage, a coil temperature of the indoor heat exchanger at an initial time and an end time of a current adjustment cycle is obtained with a second preset time length as an adjustment cycle, so that a coil cooling rate of the indoor heat exchanger is calculated;

[0049] According to a comparison relationship between the coil cooling rate and a preset cooling rate threshold, a current operating parameter of the air conditioner in a next adjustment cycle is adjusted, so that the indoor heat exchanger is frosted;

[0050] When a preset frosting completion condition is met, the air conditioner is controlled to enter a defrosting stage.

[0051] Compared with the prior art, the air conditioner and the automatic cleaning control method of the air conditioner disclosed by the present application, when a preset self-cleaning instruction is received, a target operating parameter of the air conditioner is determined, and the air conditioner is controlled to run in a refrigeration mode according to the target operating parameter, so that the indoor heat exchanger is condensed; after the air conditioner runs for a first preset time length, the air conditioner is controlled to enter a frosting stage, a coil temperature of the indoor heat exchanger at an initial time and an end time of a current adjustment cycle is obtained with a second preset time length as an adjustment cycle, so that a coil cooling rate of the indoor heat exchanger is calculated; according to a comparison relationship between the coil cooling rate and a preset cooling rate threshold, a current operating parameter of the air conditioner in a next adjustment cycle is adjusted, so that the indoor heat exchanger is frosted; when a preset frosting completion condition is met, the air conditioner is controlled to enter a defrosting stage. By using the technical means of the embodiments of the present application, the condensation stage, the frosting stage and the melting stage and the whole process under the self-cleaning function of the indoor heat exchanger are completed one by one by controlling the operating parameters of the air conditioner. The air conditioner control strategy of the frosting stage is improved in the embodiments of the present application. By the change trend of the coil temperature of the indoor heat exchanger, the frosting state of the indoor heat exchanger is judged, and the operating parameters of the air conditioner are adjusted in real time. The indoor heat exchanger can be quickly frosted with a frost layer. The frosting efficiency of the indoor heat exchanger is effectively improved. Energy-saving control frosting is realized. The self-cleaning efficiency is higher, and the cleaning effect is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 is a structural schematic diagram of an air conditioner in an embodiment provided by the present application;

[0053] Figure 2Fig. 1 is a partial structure schematic diagram of a refrigerant circuit of an air conditioner in an embodiment of the present application;

[0054] Figure 3 Fig. 2 is a partial structure schematic diagram of the air conditioner in another embodiment of the present application;

[0055] Figure 4 Fig. 3 is a flow schematic diagram of work performed by a controller in a first embodiment of the present application;

[0056] Figure 5 Fig. 4 is a flow schematic diagram of work performed by the controller in a second embodiment of the present application;

[0057] Figure 6 Fig. 5 is a flow schematic diagram of work performed by the controller in a third embodiment of the present application;

[0058] Figure 7 Fig. 6 is a flow schematic diagram of work performed by the controller in a fourth embodiment of the present application;

[0059] Figure 8 Fig. 7 is a flow schematic diagram of work performed by the controller in a fifth embodiment of the present application;

[0060] Figure 9 Fig. 8 is a flow schematic diagram of work performed by the controller in a sixth embodiment of the present application;

[0061] Figure 10 Fig. 9 is a flow schematic diagram of an automatic cleaning control method of an air conditioner provided by an embodiment of the present application. DETAILED DESCRIPTION

[0062] The technical solutions in the embodiments of the present application will be clearly and completely described in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0063] In the description of the present application, it should be understood that the terms “center”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0064] The terms "first", "second", "third", etc. are used only for descriptive purposes and do not connote or imply relative importance or an ordering between or among the indicated technical features. Thus, features defined with "first", "second", or "third" can include one or more of the features implicitly or explicitly.

[0065] In the description of the present application, it should be noted that unless specifically stated and limited otherwise, the terms "mount", "connect", "connection" should be construed broadlyly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0066] Referring to Figure 1 , is a structural schematic diagram of an air conditioner in an embodiment provided by the present application. The embodiment of the present application provides an air conditioner 100, comprising an indoor unit 110 and an outdoor unit 120. The indoor unit 110 is usually arranged indoors and can be in the form of an indoor hanging machine or an indoor cabinet machine. The outdoor unit 120 is usually arranged outdoors and is used for indoor environment heat exchange. The air conditioner 100 has a refrigerant circuit 130. By circulating the refrigerant in the refrigerant circuit 130, a vapor compression refrigeration cycle can be performed. Connection pipes are connected to the indoor unit 110 and the outdoor unit 120 to form a refrigerant circuit for circulating the refrigerant.

[0067] Referring to Figure 2 , is a partial structural schematic diagram of the refrigerant circuit of the air conditioner in the embodiment of the present application. In the present application, the air conditioner performs a refrigeration cycle of the air conditioner by using a compressor 131, an indoor heat exchanger 132, an expansion valve 133 and an outdoor heat exchanger 134. The refrigeration cycle includes a series of processes, involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been adjusted and heat exchanged. Among them, the indoor heat exchanger 132 is usually arranged in the indoor unit 110, the compressor 131 and the outdoor heat exchanger 134 are usually arranged in the outdoor unit 120, and the expansion valve 133 can be arranged in the indoor unit 110 or the outdoor unit 120. The indoor heat exchanger 132 and the outdoor heat exchanger 134 are used as a condenser or an evaporator. When the indoor heat exchanger 132 is used as a condenser, the air conditioner is used as a heater in a heating mode. When the indoor heat exchanger 132 is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.

[0068] The compressor 131 compresses refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process. The expansion valve 133 expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve 133 and returns refrigerant gas in a low-temperature and low-pressure state to the compressor 131. The evaporator can achieve a refrigeration effect by exchanging heat with a material to be cooled using latent heat of evaporation of the refrigerant. Throughout the cycle, the air conditioner can adjust the temperature of the indoor space.

[0069] Referring to Figure 3 , is a partial structure schematic diagram of the air conditioner in another embodiment of the present application, in addition to the indoor heat exchanger 132, the shell of the indoor unit 110 also includes an indoor fan 111, a guide vane for guide vane control, including a plurality of transverse guide vanes 112 and longitudinal guide vanes 113. The indoor fan 111 is configured to be able to change the air volume when blowing out the adjusted air that has been heat exchanged by the indoor heat exchanger to the indoor, and the guide vane is configured to be able to swing the blowing direction of the adjusted air blown out from the indoor fan, wherein the transverse guide vane 112 is used to adjust the up-down air supply direction, and the longitudinal guide vane 113 is used to adjust the left-right air supply direction. In addition to the compressor 131 and the outdoor heat exchanger 134, the outdoor unit 120 also includes an outdoor fan 121, which generates an air flow of outdoor air through the outdoor heat exchanger 134 to promote heat exchange between the refrigerant flowing in the heat transfer pipe and the outdoor air.

[0070] Further, the air conditioner 100 also includes a controller 140, which has an outdoor control device built into the outdoor unit 120 and an indoor control device built into the indoor unit 110. The outdoor control device and the indoor control device are configured to be connected to each other by a signal line, and can send / receive signals to each other, thereby realizing operations such as information acquisition and control instruction issuance of components of the air conditioner.

[0071] In the embodiment of the present application, referring to Figure 4 , is a flowchart of the controller performing work in the first embodiment, the controller 140 can respond to a preset self-cleaning instruction to perform control operations to complete the self-cleaning function of the indoor heat exchanger of the air conditioner, specifically including steps S11 to S14:

[0072] S11, when receiving a preset self-cleaning instruction, determining the target operating parameters of the air conditioner, and controlling the air conditioner to run in a refrigeration mode according to the target operating parameters to condense the indoor heat exchanger;

[0073] S12, when the air conditioner runs for a first preset time length, the air conditioner enters a frosting stage, a second preset time length is taken as an adjustment period, the coil temperature of the indoor heat exchanger at the initial time and the end time of the current adjustment period is obtained to calculate the coil temperature reduction rate of the indoor heat exchanger;

[0074] S13, according to the comparison relationship between the coil temperature reduction rate and a preset temperature reduction rate threshold, the current operation parameter of the air conditioner in the next adjustment period is adjusted to make the indoor heat exchanger frost;

[0075] S14, when a preset frosting completion condition is met, the air conditioner enters a defrosting stage.

[0076] In the embodiment of the application, the self-cleaning process of the air conditioner at least includes a condensation stage, a frosting stage and a defrosting stage.

[0077] When the controller 140 receives a preset self-cleaning instruction, in response to the self-cleaning instruction, first, the air conditioner 100 enters the condensation stage to make the indoor heat exchanger 132 surface produce enough condensation water. Specifically, in the condensation stage, the target operation parameters of each component of the air conditioner are determined, the air conditioner is controlled to run in the refrigeration mode, and each component of the air conditioner runs according to the determined target operation parameters. In the refrigeration mode, the indoor heat exchanger 132 acts as an evaporator to produce condensation water.

[0078] When a preset condensation completion condition is met, the air conditioner 100 enters the frosting stage to make the condensation water on the surface of the indoor heat exchanger 132 frost. Preferably, the condensation completion condition is that the air conditioner runs for a first preset time length t1 in the condensation stage. Specifically, in the frosting stage, a second preset time length t2 is taken as an adjustment period, and in each adjustment period t2, the coil temperature of the indoor heat exchanger 132 at the initial time and the end time is collected, which is recorded as Tp0 and Tp' respectively. The coil temperature reduction rate V of the indoor heat exchanger 132 is calculated according to the coil temperature Tp0 and Tp'.

[0079] The coil temperature reduction rate V satisfies the calculation formula: V=(Tp0-Tp') / t2.

[0080] Then, the coil temperature reduction rate V is compared with a preset temperature reduction rate threshold Vn in size relationship, and according to the comparison result, the current operation parameter of the air conditioner in the next adjustment period t2 is adjusted to make the indoor heat exchanger frost quickly. Further, when a preset frosting completion condition is met, the air conditioner enters the defrosting stage to make the frost layer on the surface of the indoor heat exchanger 132 melt, so as to realize the self-cleaning of the indoor heat exchanger 132 of the air conditioner.

[0081] It should be noted that the preset cooling rate threshold Vn and the first preset time t1 are pre-set values, which can be set and adjusted according to actual conditions, and are not specifically limited here.

[0082] By adopting the technical means of the embodiment of the present application, the whole process of the condensation stage, the frosting stage and the melting stage under the self-cleaning function of the indoor heat exchanger is completed one by one by controlling the operating parameters of the air conditioner. The air conditioner control strategy of the frosting stage is improved in the embodiment of the present application. The frosting state of the indoor heat exchanger is judged through the change trend of the coil temperature of the indoor heat exchanger, and the operating parameters of the air conditioner are adjusted in real time. The indoor heat exchanger can be quickly frosted to form a frost layer. The frosting efficiency of the indoor heat exchanger is effectively improved. Energy-saving control frosting is realized. The self-cleaning efficiency is higher, and the cleaning effect is guaranteed.

[0083] As a preferred embodiment, refer to Figure 5 is a flowchart of the work performed by the controller in the second embodiment. The embodiment of the present application is further implemented on the basis of the above-mentioned embodiment. The operating parameters of the air conditioner include the operating frequency of the compressor 131 and the operating speed of the outdoor fan 121.

[0084] Then step S13, that is, adjusting the current operating parameters of the air conditioner in the next adjustment period according to the comparison relationship between the coil cooling rate and the preset cooling rate threshold, specifically includes steps S131 and S132:

[0085] S131, when the coil cooling rate is less than or equal to the cooling rate threshold, in the next adjustment period, the current operating frequency of the compressor is increased by a preset frequency adjustment step, and the current operating speed of the outdoor fan is increased by a preset speed adjustment step.

[0086] S132, when the coil cooling rate is greater than the cooling rate threshold, in the next adjustment period, the current operating frequency of the compressor and the current operating speed of the outdoor fan are maintained unchanged.

[0087] In the condensation phase, the compressor 131 and the outdoor fan 121 are controlled to operate at corresponding target operating frequencies and target operating speeds, and after the compressor operates for a first preset time length t1, the system enters the frosting phase. At this time, the compressor remains at the original operating frequency, and within a preset adjustment period t2, the coil temperature reduction rate V is calculated. The coil temperature reduction rate V is compared with a preset temperature reduction rate threshold Vn. When V≤Vn is satisfied, within the next adjustment period t2, the operating frequency f of the compressor 131 is increased by a preset frequency adjustment step Δf, i.e., f=f+Δf, for example, the operating frequency of the compressor is increased by one gear. At the same time, the operating speed r of the outdoor fan 121 is increased by a preset speed adjustment step Δr, i.e., r=r+Δr, for example, the operating speed of the outdoor fan is increased by one gear, until the operating frequency of the compressor 131 reaches a preset maximum gear, and the operating speed of the outdoor fan 121 reaches a maximum gear.

[0088] It should be noted that the preset frequency adjustment step Δf, the preset speed adjustment step Δr, and the second preset time length t2 are all preset values, which can be set and adjusted according to actual conditions, and are not limited here.

[0089] The technical means of the embodiment of the present application is adopted, the frosting state of the indoor heat exchanger is judged through the change trend of the coil temperature of the indoor heat exchanger, so as to adjust the operating frequency of the compressor and the operating speed of the outdoor fan, improve the frosting efficiency of the indoor heat exchanger, and realize energy-saving control frosting.

[0090] As a preferred embodiment, see Figure 6 is a flowchart of the work performed by the controller in the third embodiment of the present application. Based on any of the above embodiments, the present embodiment further implements. In the present embodiment, in step S11, the target operating parameters of the air conditioner are determined, and the air conditioner is controlled to operate in the cooling mode according to the target operating parameters to condense the indoor heat exchanger. Specifically, steps S111 to S113 are included:

[0091] S111, obtain the current environmental parameters; wherein the environmental parameters include indoor environmental temperature, indoor environmental humidity and outdoor environmental humidity;

[0092] S112, determine the running frequency of the compressor and the running speed of the outdoor fan corresponding to the current environmental parameter according to the correspondence relationship between the preset environmental parameter and the running frequency of the compressor and the running speed of the outdoor fan, as the target running frequency and the target running speed respectively;

[0093] S113, control the air conditioner to enter the refrigeration mode, the compressor runs at the target running frequency, and the outdoor fan runs at the target running speed.

[0094] In the embodiment of the application, in the condensation stage, the operation parameter control of the air conditioner includes the operation frequency control of the compressor 131 and the operation speed control of the outdoor fan 121, the correspondence relationship between the indoor environmental temperature Tn, the indoor environmental humidity Hn, the outdoor environmental humidity Tw and the operation frequency f of the compressor 131 and / or the operation speed r of the outdoor fan 121 is established in advance, so as to realize the operation control of the compressor and the outdoor fan.

[0095] Further, when the self-cleaning instruction is received, the current environmental parameters including the indoor environmental temperature Tn, the indoor environmental humidity Hn and the outdoor environmental humidity Tw are collected, the operation frequency f of the compressor 131 and the operation speed r of the outdoor fan 121 are determined according to the indoor environmental temperature Tn, the indoor environmental humidity Hn and the outdoor environmental humidity Tw, the air conditioner is controlled to enter the refrigeration mode, and the compressor 131 and the outdoor fan 121 run at the determined operation parameters.

[0096] It should be noted that the selection principle of the operation frequency f of the compressor is that the outdoor environmental temperature is determined by the reference temperature interval to determine the reference operation frequency, the larger the deviation from the reference temperature interval, the lower the operation frequency; at the same indoor temperature, the lower the indoor environmental humidity, the higher the operation frequency.

[0097] As an example, the values of the indoor environmental temperature Tn, the indoor environmental humidity Hn, the outdoor environmental humidity Tw and the operation frequency f of the compressor 131 are shown in Table 1:

[0098] Table 1

[0099]

[0100] It can be understood that the values involved in the above table 1 are only as an example, and in actual application, they can be adjusted and set according to actual situation, and do not affect the beneficial effects obtained by the application.

[0101] It should be noted that the selection principle of the operation speed r of the outdoor fan is that the outdoor environmental temperature is determined by the reference temperature interval to determine the reference operation speed, the larger the deviation from the reference temperature interval, the lower the operation speed; at the same indoor temperature, the lower the indoor environmental humidity, the higher the operation speed.

[0102] The technical means of the embodiment of the present application improves the control strategy of the air conditioner in the condensation stage, and optimizes and adjusts the operation parameters of the air conditioner in the cooling mode according to the real-time environmental conditions, so that the indoor heat exchanger quickly generates sufficient condensation water, improves the condensation efficiency of the indoor heat exchanger, and improves the self-cleaning efficiency.

[0103] As a preferred embodiment, the operation parameters of the air conditioner further include the swing angles of the horizontal air deflector 112 and the longitudinal air deflector 113.

[0104] Then, step S11, that is, the determination of the target operation parameters of the air conditioner and the control of the air conditioner to run the cooling mode according to the target operation parameters to make the indoor heat exchanger condense, further includes steps S114 and S115:

[0105] S114, determining the upper limit swing angle of the horizontal air deflector as the first target swing angle, and determining the left limit swing angle or the right limit swing angle of the longitudinal air deflector as the second target swing angle.

[0106] S115, controlling the horizontal air deflector to swing to the first target swing angle, and controlling the longitudinal air deflector to swing to the second target swing angle.

[0107] In the embodiment of the present application, when the self-cleaning instruction is received, the condensation stage is entered, the horizontal air deflector 112 is controlled to be placed at the upper limit swing angle, that is, the horizontal upper limit minimum angle and fixed, the longitudinal air deflector 113 is controlled to be placed at the left limit swing angle or the right limit swing angle, that is, swung to the left or right direction limit minimum angle and fixed, and the compressor 131 and the outdoor fan 121 are controlled to run in the cooling mode according to the control strategy of the above embodiment.

[0108] It should be noted that the left limit swing angle, the right limit swing angle and the upper limit swing angle of the air deflector are all pre-set values, which can be set and adjusted according to the actual situation, and are not limited here.

[0109] By adjusting the swing angle of the air deflector, the technical means of the embodiment of the present application can make the surface of the indoor heat exchanger generate sufficient condensation water to prepare for subsequent frosting, and improve the self-cleaning efficiency.

[0110] As a preferred embodiment, referring to Figure 7is a flowchart of the controller in the fourth embodiment of the present application, and the present embodiment is implemented on the basis of any of the above embodiments. In step S14, the preset frosting completion condition is that the coil temperature Tp of the indoor heat exchanger is less than or equal to a preset first coil temperature threshold Tp1, or the length of time that the air conditioner is in the frosting stage reaches a third preset length of time.

[0111] In the present embodiment, when the coil temperature of the indoor heat exchanger satisfies Tp≤Tp1, or the length of time that the air conditioner is in the frosting stage reaches the third preset length of time t3, that is, the compressor running time reaches the third preset length of time t3 since the air conditioner enters the frosting stage, it is considered that the current satisfies the frosting completion condition, and then the indoor heat exchanger exits the frosting stage and enters the defrosting stage.

[0112] It should be noted that the preset first coil temperature threshold Tp1 and the third preset length of time t3 are both preset values, which can be set and adjusted according to actual conditions, and are not limited here.

[0113] Preferably, the defrosting stage includes a first defrosting stage and a second defrosting stage, wherein the first defrosting stage adopts a natural defrosting mode of circulating air supply, and the second defrosting stage adopts a heating defrosting mode.

[0114] Step S14, that is, when the preset frosting completion condition is satisfied, the air conditioner is controlled to enter the defrosting stage, specifically including steps S141 to S143:

[0115] S141, when the preset frosting completion condition is satisfied, the compressor and the outdoor fan are controlled to stop running;

[0116] S142, after the compressor and the outdoor fan stop running, the air conditioner is controlled to enter the first defrosting stage;

[0117] S143, when the length of time that the air conditioner is in the first defrosting stage reaches a fourth preset length of time, the air conditioner is controlled to enter the second defrosting stage.

[0118] Specifically, when the indoor heat exchanger enters the defrosting stage, the compressor 131 and the outdoor fan 121 are first controlled to stop running, and then the air conditioner is controlled to enter the first defrosting stage, that is, a natural defrosting mode of circulating air supply is adopted to melt the frost layer of the indoor heat exchanger.

[0119] Preferably, during the first defrosting stage, the indoor fan 111 is started to run at a preset first running speed, and the opening degree of the expansion valve 133 is adjusted to a preset maximum opening degree. For example, the running speed of the indoor fan 111 is adjusted to the first running speed and kept for a fourth preset time t4, for example, 60 minutes, the opening degree of the expansion valve 133 is adjusted to the maximum opening degree and fixed, and meanwhile, the horizontal air deflector 112 is maintained at an upper limit swing angle, i.e., an angle of not blowing to people upward, at which the indoor heat exchanger is in a natural defrosting state under the circulating air supply.

[0120] It should be noted that the preset first running speed, the preset maximum opening degree and the fourth preset time t4 are all preset values, which can be set and adjusted according to actual conditions, and are not specifically limited here.

[0121] By using the technical means of the embodiment of the present application, the control strategy of the air conditioner in the defrosting stage is improved. After the frosting of the indoor heat exchanger is completed, the defrosting mode is not immediately taken as the heating mode, but the air supply mode is used for defrosting, so that the indoor heat exchanger can be kept in the natural defrosting state under the ambient temperature, and the phenomenon that a large amount of hot air is blown out of the room to meet the cold air to produce condensation and dripping water is avoided, thereby improving the user experience.

[0122] Further, after the fourth preset time t4, the first defrosting stage is ended, and the air conditioner is controlled to enter a second defrosting stage, i.e., the frosting layer of the indoor heat exchanger is melted by using the heating defrosting mode.

[0123] Preferably, during the second defrosting stage, the indoor fan is controlled to stop running, the air conditioner is controlled to enter the heating mode, the compressor is run at a preset running frequency, the outdoor fan is run at a preset highest running speed, and the opening degree of the expansion valve is adjusted to a preset opening degree value, until the second defrosting stage is ended.

[0124] It should be noted that the preset running frequency, the preset opening degree value and the preset highest running speed are all preset values, which can be set and adjusted according to actual conditions, and are not specifically limited here.

[0125] By using the technical means of the embodiment of the present application, after the indoor heat exchanger is defrosted in the air supply state, the room temperature gradually rises, the remaining frost of the indoor heat exchanger is quickly melted and removed by the fast heating hot air, the effect of removing the dirt and other impurities on the surface of the heat exchanger is achieved, and since the indoor fan is closed and the time is short, the phenomenon that the hot air meets the condensation will not occur.

[0126] As a preferred embodiment, refer to Figure 8is a flowchart of the controller in the fifth embodiment of the present application, and the embodiment of the present application is further implemented on the basis of the above-mentioned embodiments, wherein, in addition to the condensation stage, the frost formation stage and the defrosting stage, the self-cleaning process of the air conditioner further comprises a drying stage.

[0127] In step S14, when the preset defrosting completion condition is met, the controller controls the air conditioner to enter the defrosting stage, and then executes step S15.

[0128] S15, when the preset defrosting completion condition is met, the controller controls the air conditioner to enter the drying stage; in the drying stage, the controller controls the compressor and the outdoor fan to stop running, controls the indoor fan to start running at a preset second running speed, and stops running after running for a fifth preset time length.

[0129] The defrosting completion condition is that the coil temperature of the indoor heat exchanger reaches a preset second coil temperature threshold Tp2, or the exhaust pressure of the compressor is greater than or equal to a preset pressure threshold PA1.

[0130] In the embodiment of the present application, when the coil temperature of the indoor heat exchanger 132 satisfies Tp≥Tp2, or the exhaust pressure PA of the exhaust outlet of the compressor 131 satisfies PA≥PA1, it is considered that the defrosting completion condition is met, and then the defrosting stage of the indoor heat exchanger is exited and the drying stage is entered.

[0131] When the air conditioner enters the drying stage, the compressor 131 and the outdoor fan 121 are controlled to stop running, and the indoor fan 111 is controlled to start running at a second running speed, and is turned off after running for a fifth preset time length t5, and the whole air conditioner returns to the standby state or the running state before the self-cleaning, and the drying stage of the air supply is completed, and the whole self-cleaning process is ended.

[0132] It should be noted that the preset second coil temperature threshold Tp2, the preset pressure threshold PA1 and the fifth preset time length t5 are all preset values, which can be set and adjusted according to actual conditions, and are not limited here.

[0133] By using the technical means of the embodiment of the present application, after the indoor heat exchanger is defrosted by high-temperature hot gas, the indoor fan is started to cool and dry the indoor heat exchanger, which is beneficial to cool the heat exchanger and reduce the pressure of the refrigeration system, and reduce the load of the next start and shorten the start time interval.

[0134] As a preferred embodiment, refer to Figure 9, is the flowchart of the controller in the sixth embodiment of the present application. The embodiment of the present application is further implemented on the basis of the above-mentioned embodiments. In the embodiment of the present application, when the preset self-cleaning instruction is received, before the step S11, that is, before the target operation parameter of the air conditioner is determined and the air conditioner is controlled to run in the refrigeration mode according to the target operation parameter, the controller is further used to execute the following steps:

[0135] determining the current operation mode of the air conditioner; wherein the operation mode is standby mode, air supply mode, refrigeration mode, dehumidification mode or heating mode;

[0136] when the current operation mode of the air conditioner is standby mode or heating mode, the compressor and the outdoor fan are controlled to stop running, the indoor fan is controlled to run at a preset third running speed, and then the step of determining the target operation parameter of the air conditioner and controlling the air conditioner to run in the refrigeration mode according to the target operation parameter is executed;

[0137] when the current operation mode of the air conditioner is air supply mode, refrigeration mode or dehumidification mode, the step of determining the target operation parameter of the air conditioner and controlling the air conditioner to run in the refrigeration mode according to the target operation parameter is executed.

[0138] In the embodiment of the present application, when the controller 140 of the air conditioner receives the self-cleaning instruction, the current operation mode of the air conditioner is first determined. There are two cases:

[0139] when the current operation mode of the air conditioner is standby mode or heating mode, the compressor 131 and the outdoor fan 121 are first controlled to stop running, and the indoor fan 111 is controlled to start running at a preset third running speed for a certain time, and then enters the condensation stage, determines the target operation parameter of the air conditioner in the refrigeration mode, for example, in the above-mentioned embodiment, the indoor environment temperature Tn, the indoor environment humidity Hn and the outdoor environment humidity Tw are collected, the running frequency of the compressor 131 and the running speed of the outdoor fan 121 are determined, the swing angle of the longitudinal air deflector and the horizontal air deflector is controlled, and then the frosting stage, the defrosting stage and the drying stage are entered in sequence to complete the whole self-cleaning process.

[0140] when the current operation mode of the air conditioner is air supply mode, refrigeration mode or dehumidification mode, the indoor fan does not need to run at the third running speed for a certain time, directly enters the condensation stage, determines the target operation parameter of the air conditioner in the refrigeration mode, and then enters the frosting stage, the defrosting stage and the drying stage in sequence to complete the whole self-cleaning process.

[0141] Preferably, when the air conditioner enters the frosting state, the indoor fan 111 is first controlled to stop running, and then the running state of the compressor and the outdoor fan is controlled according to the coil temperature change of the indoor heat exchanger.

[0142] By using the technical means of the embodiment of the present application, when the self-cleaning instruction is received, if the current running mode of the air conditioner is the standby mode or the heating mode, the indoor fan is started to run for a certain time length, which can improve the accuracy of collecting the environmental parameters, thereby improving the self-cleaning effect.

[0143] Referring to Figure 10 is a flowchart of an automatic cleaning control method of an air conditioner provided by the embodiment of the present application, the embodiment of the present application further provides an automatic cleaning control method of an air conditioner, which is applied to the air conditioner, the air conditioner comprising an indoor unit, and the indoor unit being internally provided with an indoor heat exchanger;

[0144] The method comprises steps S21 to S24.

[0145] S21, when a preset self-cleaning instruction is received, determining a target running parameter of the air conditioner, and controlling the air conditioner to run in a refrigeration mode according to the target running parameter, so as to make the indoor heat exchanger condense dew;

[0146] S22, after the air conditioner runs for a first preset time length, controlling the air conditioner to enter a frosting stage, taking a second preset time length as an adjustment period, obtaining the coil temperature of the indoor heat exchanger at an initial time and an end time of the current adjustment period, so as to calculate the coil temperature drop rate of the indoor heat exchanger;

[0147] S23, according to the comparison relationship between the coil temperature drop rate and a preset temperature drop rate threshold, adjusting the current running parameter of the air conditioner in the next adjustment period, so as to make the indoor heat exchanger frost;

[0148] S24, when a preset frosting completion condition is met, controlling the air conditioner to enter a defrosting stage.

[0149] By using the technical means of the embodiment of the present application, the running parameters of the air conditioner are controlled to complete the whole process of the condensation stage, the frosting stage and the melting stage under the self-cleaning function of the indoor heat exchanger one by one, the control strategy of the air conditioner in the frosting stage is improved in the embodiment of the present application, the frosting state of the indoor heat exchanger is judged through the change trend of the coil temperature of the indoor heat exchanger, and the running parameters of the air conditioner are adjusted in real time, which can quickly make the indoor heat exchanger frost, effectively improves the frosting efficiency of the indoor heat exchanger, realizes energy-saving control frosting, makes the self-cleaning efficiency higher, and guarantees the cleaning effect.

[0150] It should be noted that the automatic cleaning control method of the air conditioner provided by the embodiment of the present application is the same as all the process steps performed by the controller of the air conditioner of the above-mentioned embodiment, and the working principles and beneficial effects of the two are one-to-one correspondence, thus not being described again.

[0151] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by a computer program instructing the relevant hardware, and the program can be stored in a computer readable storage medium. When the program is executed, it can include the processes of the above-mentioned embodiment methods. The storage medium can be a magnetic disc, an optical disc, a read-only memory (ROM), a random access memory (RAM), etc.

[0152] The above is the preferred embodiment of the present application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements are also considered within the protection scope of the present application.

Claims

1. An air conditioner characterized by comprising: The air conditioner comprises: a refrigerant circuit, in which refrigerant is circulated sequentially through a compressor, a condenser, an expansion valve, and an evaporator, one of the condenser and the evaporator being an outdoor heat exchanger and the other being an indoor heat exchanger; an indoor fan for driving indoor air to be sent out from an air outlet after heat exchange with the indoor heat exchanger; an outdoor fan for driving outdoor air to be heat exchanged with the outdoor heat exchanger; a controller configured to: determine target operating parameters of the air conditioner when a preset self-cleaning instruction is received, and control the air conditioner to run in a refrigeration mode according to the target operating parameters so that the indoor heat exchanger is condensed; control the air conditioner to enter a frosting stage after the air conditioner runs for a first preset time length, take the coil temperature of the indoor heat exchanger at an initial time and an end time of a current adjustment period as an adjustment cycle as the adjustment cycle, and calculate the coil temperature drop rate of the indoor heat exchanger; adjust the current operating parameters of the air conditioner in a next adjustment period according to a comparison relationship between the coil temperature drop rate and a preset temperature drop rate threshold, so that the indoor heat exchanger is frosted; control the air conditioner to enter a defrosting stage when a preset frosting completion condition is met; the operating parameters of the air conditioner include the operating frequency of the compressor and the operating rotating speed of the outdoor fan; the adjustment of the current operating parameters of the air conditioner in the next adjustment period according to the comparison relationship between the coil temperature drop rate and the preset temperature drop rate threshold specifically includes: when the coil temperature drop rate is less than or equal to the temperature drop rate threshold, the current operating frequency of the compressor is increased by a preset frequency adjustment step and the current operating rotating speed of the outdoor fan is increased by a preset rotating speed adjustment step in the next adjustment period; when the coil temperature drop rate is greater than the temperature drop rate threshold, the current operating frequency of the compressor and the current operating rotating speed of the outdoor fan are maintained unchanged in the next adjustment period.

2. The air conditioner of claim 1, wherein the operating parameters of the air conditioner include the operating frequency of the compressor and the operating rotating speed of the outdoor fan; the determination of the target operating parameters of the air conditioner and the control of the air conditioner to run in the refrigeration mode according to the target operating parameters so that the indoor heat exchanger is condensed specifically includes: obtaining current environmental parameters; wherein the environmental parameters include indoor environmental temperature, indoor environmental humidity, and outdoor environmental humidity; determining the operating frequency of the compressor and the operating rotating speed of the outdoor fan corresponding to the current environmental parameters as target operating frequency and target operating rotating speed respectively according to a preset correspondence between environmental parameters and the operating frequency of the compressor and the operating rotating speed of the outdoor fan; controlling the air conditioner to enter the refrigeration mode, the compressor to run at the target operating frequency, and the outdoor fan to run at the target operating rotating speed.

3. The air conditioner of claim 2, wherein the air outlet is provided with a horizontal air deflector and a vertical air deflector, the horizontal air deflector is used to adjust the up-down air supply direction, and the vertical air deflector is used to adjust the left-right air supply direction; the operating parameters of the air conditioner further include the swing angles of the horizontal air deflector and the vertical air deflector. The determining the target operation parameter of the air conditioner and controlling the air conditioner to run in the refrigeration mode according to the target operation parameter to make the indoor heat exchanger condense, further comprises: determining an upper limit swing angle of the transverse air deflector as a first target swing angle, and determining a left limit swing angle or a right limit swing angle of the longitudinal air deflector as a second target swing angle; controlling the transverse air deflector to swing to the first target swing angle, and controlling the longitudinal air deflector to swing to the second target swing angle.

4. The air conditioner of claim 1, wherein The preset frost completion condition is that the coil temperature of the indoor heat exchanger is less than or equal to a preset first coil temperature threshold, or the air conditioner is in the frost stage for a third preset time length.

5. The air conditioner of claim 1, wherein The defrosting stage comprises a first defrosting stage and a second defrosting stage; and the controlling the air conditioner to enter the defrosting stage when the preset frost completion condition is met comprises: controlling the compressor and the outdoor fan to stop running when the preset frost completion condition is met; controlling the air conditioner to enter the first defrosting stage after the compressor and the outdoor fan stop running; wherein the first defrosting stage adopts a natural defrosting mode of circulating air supply; controlling the air conditioner to enter the second defrosting stage when the air conditioner is in the first defrosting stage for a fourth preset time length; wherein the second defrosting stage adopts a heating defrosting mode.

6. The air conditioner of claim 5, wherein In the first defrosting stage, the indoor fan starts running at a preset first running speed, and the opening degree of the expansion valve is adjusted to a preset maximum opening degree. In the second defrosting stage, the indoor fan is controlled to stop running, the air conditioner is controlled to enter a heating mode, the compressor runs at a preset running frequency, the outdoor fan runs at a preset highest running speed, and the opening degree of the expansion valve is adjusted to a preset opening value.

7. The air conditioner of claim 6, wherein After the controller controls the air conditioner to enter the defrosting stage when the preset frost completion condition is met, the controller is further configured to: controlling the air conditioner to enter a drying stage when a preset defrosting completion condition is met; in the drying stage, the compressor and the outdoor fan are controlled to stop running, the indoor fan is controlled to start running at a preset second running speed and stop running after running for a fifth preset time length; wherein the defrosting completion condition is that the coil temperature of the indoor heat exchanger reaches a preset second coil temperature threshold, or the discharge pressure of the compressor is greater than or equal to a preset pressure threshold.

8. The air conditioner of claim 2, wherein before the determining the target operation parameter of the air conditioner and controlling the air conditioner to run in the refrigeration mode according to the target operation parameter, the controller is further configured to: determining the current operation mode of the air conditioner; wherein the operation mode is a standby mode, an air supply mode, a refrigeration mode, a dehumidification mode or a heating mode; When the current operation mode of the air conditioner is the standby mode or the heating mode, the compressor and the outdoor fan are controlled to stop running, the indoor fan is controlled to run at a preset third running speed, and then the step of determining the target operation parameter of the air conditioner and controlling the air conditioner to run in the cooling mode according to the target operation parameter is performed. When the current operation mode of the air conditioner is the air supply mode, the cooling mode or the dehumidification mode, the step of determining the target operation parameter of the air conditioner and controlling the air conditioner to run in the cooling mode according to the target operation parameter is performed.

9. An automatic cleaning control method of an air conditioner, characterized by, The air conditioner comprises: a refrigerant circuit, in which a refrigerant circulates sequentially through a compressor, a condenser, an expansion valve and an evaporator, one of the condenser and the evaporator being an outdoor heat exchanger and the other being an indoor heat exchanger; an indoor fan for driving indoor air to be sent out from an air outlet after heat exchange with the indoor heat exchanger; an outdoor fan for driving outdoor air to be heat exchanged with the outdoor heat exchanger; The method comprises: When a preset self-cleaning instruction is received, the target operation parameter of the air conditioner is determined, and the air conditioner is controlled to run in the cooling mode according to the target operation parameter, so that the indoor heat exchanger is condensed. After the air conditioner runs for a first preset time length, the air conditioner is controlled to enter a frosting stage, the coil temperature of the indoor heat exchanger at an initial time and an end time of a current adjustment cycle is acquired to calculate a coil temperature drop rate of the indoor heat exchanger, with a second preset time length as an adjustment cycle. According to a comparison relationship between the coil temperature drop rate and a preset temperature drop rate threshold, the current operation parameter of the air conditioner in a next adjustment cycle is adjusted, so that the indoor heat exchanger is frosted. When a preset frosting completion condition is met, the air conditioner is controlled to enter a defrosting stage. The operation parameter of the air conditioner comprises a running frequency of the compressor and a running speed of the outdoor fan. According to the comparison relationship between the coil temperature drop rate and the preset temperature drop rate threshold, the current operation parameter of the air conditioner in the next adjustment cycle is adjusted, specifically comprising: When the coil temperature drop rate is less than or equal to the temperature drop rate threshold, the current running frequency of the compressor is increased by a preset frequency adjustment step and the current running speed of the outdoor fan is increased by a preset speed adjustment step in the next adjustment cycle; When the coil temperature drop rate is greater than the temperature drop rate threshold, the current running frequency of the compressor and the current running speed of the outdoor fan are maintained unchanged in the next adjustment cycle.

Images