Air conditioner control method

Abstract

The application provides an air conditioner control method. The air conditioner has a lower air outlet mode for air outlet through a lower air outlet of an air conditioner indoor unit, an upper air outlet mode for air outlet through an upper air outlet of the air conditioner indoor unit, and a defrosting mode. The air conditioner control method comprises an air conditioner pre-defrosting control method, which comprises: adjusting the operation mode of the air conditioner to the lower air outlet mode; determining whether the air conditioner is switched from the lower air outlet mode to the upper air outlet mode according to the relationship between a lower air outlet temperature T 下风口出风 and a user comfort temperature T 舒适 ; and determining whether the air conditioner enters the defrosting mode according to the relationship between an upper air outlet temperature T 上风口 , a lower air inlet temperature T 下风口进风 , and a first preset difference ΔT1 after the air conditioner is switched from the lower air outlet mode to the upper air outlet mode. The application solves the problem that heat on an indoor heat exchanger cannot be effectively utilized in the prior art defrosting method.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to an air conditioning control method. Background Technology

[0002] Currently, when air conditioners are used for heating in winter, the surface of the outdoor heat exchanger is prone to frost formation when the temperature is low and the humidity is high. The frost layer will reduce the heating performance of the air conditioner and may even damage it. Therefore, it is necessary to defrost in time.

[0003] In the existing technology, in order to solve the above problems, air conditioners usually use the "reverse defrosting method" for defrosting. That is, when entering the defrosting stage, the indoor fan stops rotating, and the air conditioner switches from heating mode to cooling mode by switching the four-way valve. The outdoor heat exchanger becomes the condenser, and the high-temperature refrigerant is used for defrosting.

[0004] However, when defrosting using the above method, the indoor fan stops rotating just as the defrosting four-way valve switches, but at this time some heat is still stored in the indoor heat exchanger, which is not effectively utilized, resulting in heat waste. Summary of the Invention

[0005] The main objective of this invention is to provide a control method for an air conditioning device to solve the problem that the defrosting method in the prior art cannot effectively utilize the heat on the indoor heat exchanger.

[0006] To achieve the above objectives, the present invention provides an air conditioning device control method. The air conditioning device has a down-discharge mode where air is discharged through the down-discharge vent of the indoor unit, an up-discharge mode where air is discharged through the up-discharge vent of the indoor unit, and a defrost mode. The air conditioning device control method includes a pre-defrost control method, which includes: step S1: adjusting the operating mode of the air conditioning device to the down-discharge mode; step S2: obtaining the down-discharge temperature T at the down-discharge vent. 下风口出风 According to the outlet air temperature T 下风口出风 With user comfort temperature T 舒适 The relationship between the two determines whether the air conditioning unit has switched from the bottom air outlet mode to the top air outlet mode; Step S3: After the air conditioning unit switches from the bottom air outlet mode to the top air outlet mode, obtain the top air outlet temperature T. 上风口 and the lower air inlet temperature T of the lower air outlet 下风口进风 According to the upper air outlet temperature T 上风口 Lower air inlet temperature T 下风口进风 The relationship between the value and the first preset difference ΔT1 determines whether the air conditioning unit has entered defrost mode.

[0007] Furthermore, based on the lower outlet air temperature T 下风口出风 With user comfort temperature T 舒适Methods for determining whether an air conditioning unit has switched from bottom air outlet mode to top air outlet mode based on the relationship between T and T include: 下风口出风 ≤T 舒适 If the air conditioner switches from bottom air outlet mode to top air outlet mode, then the air conditioner will continue to monitor the bottom air outlet temperature T. 下风口出风 .

[0008] Furthermore, the indoor unit of the air conditioner includes an indoor heat exchanger, a first indoor fan, and a second indoor fan. The first indoor fan is located near the upper air outlet, and the second indoor fan is located near the lower air outlet; based on the upper air outlet temperature T... 上风口 Lower air inlet temperature T 下风口进风 The method for determining whether the air conditioning unit has entered defrost mode based on the relationship between T and the first preset difference ΔT1 includes: if T 上风口 -T 下风口进风 If the temperature is ≤ΔT1, the first internal fan will stop running and the air conditioning unit will enter defrost mode; otherwise, the upper air outlet temperature T will continue to be monitored. 上风口 and the lower air inlet temperature T of the lower air outlet 下风口进风 .

[0009] Furthermore, in step S1, the second internal fan is controlled to operate at a minimum speed value X. min run.

[0010] Furthermore, in step S2, when the air conditioning unit switches to the top air outlet mode, the first indoor fan is controlled to operate at its minimum speed value S. min run.

[0011] Furthermore, the air conditioning unit control method also includes a control method after the air conditioning unit completes defrosting, which includes: step S4: controlling the air conditioning unit to switch to heating mode; step S5: acquiring the temperature T of the indoor heat exchanger. 内管 The temperature T of the lower air outlet 下风口出风 According to the temperature T of the indoor heat exchanger 内管 The temperature T of the lower air outlet 下风口出风 The relationship between the air conditioner and the second preset difference ΔT2 determines whether the air conditioning unit enters the top air outlet mode; Step S6: Obtain the top air outlet temperature T. 上风口 According to the upper air outlet temperature T 上风口 With preset temperature T 预设 The relationship between the two determines whether to adjust the speed of the first internal fan.

[0012] Furthermore, based on the temperature T of the indoor heat exchanger 内管 The temperature T of the lower air outlet 下风口出风 The method for determining whether the air conditioning unit has entered the top air outlet mode based on the relationship between T and the second preset difference ΔT2 includes: if T内管 -T 下风口出风 If the value is greater than ΔT2, then the air conditioning unit will be controlled to enter the top air outlet mode and the first indoor fan will be controlled to operate at the minimum speed value S. min run.

[0013] Furthermore, based on the upper air outlet temperature T... 上风口 With preset temperature T 预设 The methods for determining whether to adjust the speed of the first internal fan based on the relationship between T and T include: 上风口 >T 预设 Then the speed of the first internal fan will be increased to speed X.

[0014] Furthermore, the control method after the air conditioning unit completes defrosting also includes a step S7 following step S6, which includes: obtaining the upper air outlet temperature T at the upper air outlet. 上风口 Based on the upper air outlet temperature T 上风口 and user comfort temperature T 舒适 The relationship between the two determines whether to switch back to the control mode before entering defrost.

[0015] Furthermore, based on the upper air outlet temperature T... 上风口 and user comfort temperature T 舒适 The methods for determining whether to switch back to the control mode before defrosting based on the relationship between T and T include: 上风口 >T 舒适 Then the air conditioning unit will switch back to the control mode before entering defrost.

[0016] Furthermore, the outdoor unit of the air conditioning unit includes a compressor, an outdoor fan, and a four-way valve. The compressor is connected to the indoor unit of the air conditioning unit via a pipeline. The pre-defrost control method of the air conditioning unit also includes step S0, which is located before step S1: controlling the compressor and the outdoor fan to stop running, and controlling the four-way valve to switch to the opposite direction, so that the air conditioning unit switches from heating mode to cooling mode.

[0017] Furthermore, the indoor unit of the air conditioning unit includes an indoor fan, and the outdoor unit of the air conditioning unit includes a compressor, an outdoor fan, a four-way valve, and an electronic expansion valve. The compressor is connected to the four-way valve and the indoor unit of the air conditioning unit through a pipeline. The defrosting control method of the air conditioning unit also includes step S0, which is located before step S1: controlling the indoor fan and the outdoor fan to stop running, and adjusting the opening of the electronic expansion valve to the maximum opening value.

[0018] Furthermore, the indoor unit of the air conditioning unit includes an indoor fan, and the outdoor unit of the air conditioning unit includes a compressor, an outdoor fan, a four-way valve, a hot gas bypass two-way valve, and an outdoor heat exchanger. The compressor is connected to the four-way valve and the indoor unit of the air conditioning unit through a pipeline. The defrosting control method of the air conditioning unit also includes step S0, which is located before step S1: controlling the indoor fan and the outdoor fan to stop running, and opening the hot gas bypass two-way valve so that gas enters the outdoor heat exchanger through the hot gas bypass two-way valve.

[0019] Applying the technical solution of this invention, before defrosting the air conditioning unit, the operating mode of the air conditioning unit is first adjusted to the down-discharge mode, and then the down-discharge air temperature T at the down-discharge vent is obtained. 下风口出风 According to the outlet air temperature T 下风口出风 With user comfort temperature T 舒适 The relationship between the two is used to determine whether the air conditioning unit has switched from bottom air outlet mode to top air outlet mode. Then, after the air conditioning unit switches from bottom air outlet mode to top air outlet mode, the top air outlet temperature T is obtained. 上风口 and the lower air inlet temperature T of the lower air outlet 下风口进风 According to the upper air outlet temperature T 上风口 Lower air inlet temperature T 下风口进风 The relationship between the air conditioner and the first preset difference ΔT1 determines whether the air conditioner has entered defrost mode. Thus, before defrosting, the indoor unit's operating mode is adjusted to a down-discharge mode, allowing the heat stored in the indoor heat exchanger to be blown into the room through the down-discharge airflow. This avoids cold air blowing directly onto the user and affecting their experience. The heat from the indoor heat exchanger heats the air outlet from the indoor unit, effectively utilizing the stored heat. This solves the problem of ineffective heat utilization in existing defrost methods, preventing heat waste and improving energy efficiency. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 A control flowchart of the pre-defrost control method for an air conditioning unit according to Embodiment 1 of the air conditioning unit control method of the present invention is shown;

[0022] Figure 2 A control flowchart of the control method for an air conditioning device after defrosting is shown in Embodiment 1 of the air conditioning device control method according to the present invention. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0025] In this invention, unless otherwise stated, directional terms such as "up" and "down" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" are generally used in relation to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0026] To address the problem that defrosting methods in the prior art result in the ineffective utilization of heat on the indoor heat exchanger, this application provides a method for controlling an air conditioning device.

[0027] Example 1

[0028] like Figure 1 As shown, the air conditioning unit has a down-discharge mode where air is discharged through the down-discharge vent of the indoor unit, an up-discharge mode where air is discharged through the up-discharge vent of the indoor unit, and a defrost mode. The air conditioning unit control method includes a pre-defrost control method, which includes:

[0029] Step S1: Adjust the air conditioner's operating mode to downdraft mode;

[0030] Step S2: Obtain the lower air outlet temperature T. 下风口出风 According to the outlet air temperature T 下风口出风 With user comfort temperature T 舒适 The relationship between the air conditioning unit and the air outlet mode determines whether the air conditioning unit has switched from the bottom air outlet mode to the top air outlet mode.

[0031] Step S3: After the air conditioner switches from bottom air outlet mode to top air outlet mode, obtain the top air outlet temperature T. 上风口 and the lower air inlet temperature T of the lower air outlet 下风口进风 According to the upper air outlet temperature T 上风口 Lower air inlet temperature T 下风口进风 The relationship between the value and the first preset difference ΔT1 determines whether the air conditioning unit has entered defrost mode.

[0032] By applying the technical solution of this embodiment, before the air conditioning unit defrosts, the operating mode of the indoor unit is adjusted to the down-discharge mode. This allows the heat stored in the indoor heat exchanger to be blown into the room through the down-discharge method, thus preventing cold air from blowing directly onto the user and affecting their experience. The heat from the indoor heat exchanger heats the air outlet of the indoor unit, effectively utilizing the heat stored in the indoor heat exchanger. This solves the problem that the defrosting method in the prior art cannot effectively utilize the heat in the indoor heat exchanger, avoiding heat waste and improving energy efficiency.

[0033] In this embodiment, the heat stored in the indoor heat exchanger is effectively utilized before the air conditioning unit enters defrost mode, while preventing cold air from blowing in. Therefore, before the air conditioning unit starts defrosting, the heat in the indoor heat exchanger is first blown out by the indoor fan.

[0034] In this embodiment, based on the lower outlet air temperature T 下风口出风 With user comfort temperature T 舒适 The methods for determining whether an air conditioning unit has switched from bottom air outlet mode to top air outlet mode based on the relationship between the following are:

[0035] If T 下风口出风 ≤T 舒适 If the air conditioner switches from bottom air outlet mode to top air outlet mode, then the air conditioner will continue to monitor the bottom air outlet temperature T. 下风口出风 .

[0036] Specifically, when T is satisfied 下风口出风 ≤T 舒适 This indicates that the air outlet temperature at the lower air outlet has decreased to below or equal to the heating outlet comfort temperature threshold T. 舒适 If the air conditioner is turned on, the air conditioner will switch to the top air outlet mode to prevent cold air from blowing on people. However, the air outlet temperature is higher than the air inlet temperature, so it still has a heating effect on the indoor environment. To avoid blowing cold air, the air outlet mode should be switched to the top air outlet mode to improve the user experience.

[0037] In this embodiment, the indoor unit of the air conditioner includes an indoor heat exchanger, a first indoor fan, and a second indoor fan. The first indoor fan is positioned near the upper air outlet, and the second indoor fan is positioned near the lower air outlet. The air outlet temperature T is determined according to... 上风口 Lower air inlet temperature T 下风口进风 The method for determining whether the air conditioning unit has entered defrost mode based on the relationship between the first preset difference ΔT1 and the first preset difference includes:

[0038] If T 上风口 -T 下风口进风 If the temperature is ≤ΔT1, the first internal fan will stop running and the air conditioning unit will enter defrost mode; otherwise, the upper air outlet temperature T will continue to be monitored. 上风口 and the lower air inlet temperature T of the lower air outlet下风口进风 .

[0039] Specifically, when T is satisfied 上风口 -T 下风口进风 If the temperature difference between the outlet and inlet is less than the temperature difference threshold, the outlet temperature is close to the inlet temperature, and the heat stored in the indoor heat exchanger has been largely transferred to the room. Therefore, the indoor fan is stopped, and defrosting begins. The first indoor fan is located near the upper outlet, and the second indoor fan is located near the lower outlet.

[0040] In this embodiment, in step S1, the second internal fan is controlled to operate at a minimum speed value X. min run.

[0041] Specifically, the first internal fan is an upper fan, and the second internal fan is a lower fan. When the air conditioning unit switches to the lower air outlet mode, the speed of the lower fan is adjusted to the minimum permissible operating speed X. min This is because the indoor heat exchanger stores relatively little heat, and the original speed of the down fan was high. If the original speed were maintained, the heat would be blown out quickly, resulting in cold air being blown out. Therefore, the speed of the down fan was adjusted to the minimum speed value X. min The heat is slowly blown out, and the air temperature gradually decreases.

[0042] In this embodiment, in step S2, when the air conditioning unit switches to the top air outlet mode, the first indoor fan is controlled to operate at its minimum speed value S. min run.

[0043] Specifically, when the air conditioning unit switches to the top air outlet mode, the speed of the first indoor fan is adjusted to the lowest permissible operating speed S. min This is because the indoor heat exchanger stores relatively little heat. If the original speed is maintained, the heat will be quickly blown out, resulting in cold air being blown out. Therefore, the speed of the upper fan is adjusted to the minimum speed value X. min The heat is slowly blown out, and the air temperature gradually decreases.

[0044] like Figure 2 As shown, the air conditioning unit control method also includes a control method after the air conditioning unit completes defrosting, which includes:

[0045] Step S4: Control the air conditioning unit to switch to heating mode;

[0046] Step S5: Obtain the temperature T of the indoor heat exchanger 内管 The temperature T of the lower air outlet 下风口出风 According to the temperature T of the indoor heat exchanger 内管 The temperature T of the lower air outlet 下风口出风The relationship between the air conditioner and the second preset difference ΔT2 determines whether the air conditioning unit enters the top air outlet mode;

[0047] Step S6: Obtain the upper air outlet temperature T. 上风口 According to the upper air outlet temperature T 上风口 With preset temperature T 预设 The relationship between the two determines whether to adjust the speed of the first internal fan.

[0048] Specifically, after defrosting, the indoor fan can be turned on in advance to allow the room temperature to exchange heat with the indoor environment before defrosting, improving the user's thermal comfort and effectively preventing cold air from blowing in.

[0049] In this embodiment, based on the temperature T of the indoor heat exchanger 内管 The temperature T of the lower air outlet 下风口出风 The methods for determining whether the air conditioning unit has entered the top air outlet mode based on the relationship between the second preset difference ΔT2 and the second preset difference include:

[0050] If T 内管 -T 下风口出风 If the value is greater than ΔT2, then the air conditioning unit will be controlled to enter the top air outlet mode and the first indoor fan will be controlled to operate at the minimum speed value S. min run.

[0051] Specifically, because the cold air is denser and settles at the bottom, the temperature at the bottom is lower, so the outlet air temperature T at the bottom can be used. 下风口出风 As a threshold for whether air can begin to blow into the room, when T is met... 内管 -T 下风口出风 If the temperature is greater than ΔT2, it indicates that the indoor heat exchanger temperature has been preheated by the circulating refrigerant to a temperature suitable for supplying heat to the room. The indoor fan can then be turned on. To avoid insufficient heat and discomfort from the outlet air, the top-discharge mode is used, and the speed of the first indoor fan is adjusted to the minimum permissible operating speed S. min As heating operation begins, T 上风口 Gradually increasing.

[0052] In this embodiment, based on the upper air outlet temperature T 上风口 With preset temperature T 预设 The methods for determining whether to adjust the speed of the first internal fan based on the relationship between the two include:

[0053] If T 上风口 >T 预设 Then the speed of the first internal fan will be increased to speed X.

[0054] Specifically, with T 上风口 Gradually increase, until T is satisfied 上风口 >T 预设This indicates that the air outlet temperature has risen to a certain level, allowing the internal fan speed to be increased to accelerate the heating of the room. At the same time, to avoid the air outlet temperature fluctuating due to excessively rapid speed increase, the fan speed is increased at a certain rate.

[0055] In this embodiment, the control method after the air conditioning device completes defrosting further includes step S7, which follows step S6. Step S7 includes:

[0056] Obtain the upper air outlet temperature T 上风口 Based on the upper air outlet temperature T 上风口 and user comfort temperature T 舒适 The relationship between the two determines whether to switch back to the control mode before entering defrost.

[0057] In this embodiment, based on the upper air outlet temperature T 上风口 and user comfort temperature T 舒适 The methods for determining whether to switch back to the control mode before defrosting based on the relationship between the two modes include:

[0058] If T 上风口 >T 舒适 Then the air conditioning unit will switch back to the control mode before entering defrost.

[0059] Specifically, with T 上风口 Continue to rise, until T is satisfied 上风口 >T 舒适 This indicates that the heating outlet air temperature has reached a comfortable range, so the mode is switched back to the control mode before entering defrost. For example, switching back to the mode where the first and second indoor fans work simultaneously in the heating lower outlet before entering defrost, or switching back to the mode where the heating upper and lower outlets are combined before entering defrost, etc.

[0060] In this embodiment, the outdoor unit of the air conditioning system includes a compressor, an outdoor fan, and a four-way valve. The compressor is connected to the indoor unit of the air conditioning system via a pipeline. The pre-defrost control method for the air conditioning system also includes step S0, which is located before step S1.

[0061] The compressor and outdoor fan are stopped, and the four-way valve is switched to switch the air conditioning unit from heating mode to cooling mode.

[0062] In this embodiment, the air conditioning device control method of this embodiment can effectively utilize the heat stored in the indoor heat exchanger before defrosting. After defrosting, the air conditioning device can exchange heat with the room in advance, improve the user's thermal comfort, and effectively prevent cold air from blowing in.

[0063] Specifically, a comparative test was conducted between a variable frequency 3P reversible air-discharge air conditioner using a conventional control method (existing technology) and the air conditioning device control method of this embodiment. The test results are shown in Table 1. One possible value for the control parameter of the air conditioning device control method in this embodiment is: X min =300rpm, T 舒适 =38℃, S min =300rpm, ΔT1=2℃, ΔT2=1℃, T 预设 =30℃, X =30rpm / 10s.

[0064] Table 1. Comparison of test results between conventional control methods and the control method of the air conditioning unit in this embodiment for a certain variable frequency 3P reversible air outlet air conditioner.

[0065]

[0066] The above comparison shows that, compared with conventional control methods, the air conditioning device control method of this embodiment can effectively utilize the heat stored in the indoor heat exchanger before defrosting, extending the heating time to the room; after defrosting, the indoor fan starts in advance, so that the room temperature exchanges heat with the indoor temperature in advance after defrosting, improving the user's thermal comfort.

[0067] In this embodiment, the air conditioning control method is applicable to "reverse defrosting".

[0068] Example 2

[0069] The difference between the air conditioning control method in Example 2 and Example 1 is that the defrosting method is different.

[0070] In this embodiment, the air conditioning device control method is applicable to "hot gas defrosting".

[0071] In this embodiment, the indoor unit of the air conditioning unit includes an indoor fan, and the outdoor unit includes a compressor, an outdoor fan, a four-way valve, and an electronic expansion valve. The compressor is connected to the four-way valve and the indoor unit via a pipeline. The pre-defrost control method for the air conditioning unit also includes step S0, which precedes step S1.

[0072] Stop the operation of the internal and external fans and adjust the opening of the electronic expansion valve to the maximum value.

[0073] Specifically, during defrosting, the four-way valve does not switch directions. The expansion valve is opened to its maximum and the indoor and outdoor fans are shut off. This allows the high-temperature refrigerant to flow through the indoor unit without being throttled at the expansion valve before flowing to the outdoor heat exchanger for defrosting. During "hot air defrosting," one fan is turned on and operates at its lowest speed to continuously supply heat to the indoor unit. Because the fan speed is low, it has little impact on the outdoor defrosting. After defrosting, because hot refrigerant continues to flow through the indoor heat exchanger and its temperature is high, hot air can be blown directly from it.

[0074] Example 3

[0075] The difference between the air conditioning control method in Example 3 and Example 1 is that the defrosting method is different.

[0076] In this embodiment, the air conditioning control method is applicable to "hot gas bypass defrosting".

[0077] In this embodiment, the indoor unit of the air conditioning unit includes an indoor fan, and the outdoor unit includes a compressor, an outdoor fan, a four-way valve, a hot gas bypass two-way valve, and an outdoor heat exchanger. The compressor is connected to the four-way valve and the indoor unit via a pipeline. The pre-defrost control method for the air conditioning unit also includes step S0, which is located before step S1.

[0078] Stop the operation of the indoor and outdoor fans and open the hot gas bypass two-way valve to allow gas to enter the outdoor heat exchanger through the hot gas bypass two-way valve.

[0079] Specifically, during defrosting, the four-way valve does not need to be switched. Simply turn off the indoor and outdoor fans, open the hot gas bypass two-way valve, and introduce the exhaust gas directly into the outdoor heat exchanger through the bypass two-way valve for defrosting. The defrosted refrigerant then enters the gas-liquid separator through the four-way valve and is finally drawn into the compressor. In this method, the refrigerant does not flow through the indoor unit, yet some heat can still be utilized in the indoor heat exchanger. After defrosting, the indoor heat exchanger, with no refrigerant flowing through it, has a temperature similar to the indoor environment, eliminating the need for preheating the indoor heat exchanger compared to "reverse defrosting."

[0080] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0081] Before defrosting the air conditioning unit, first adjust the operating mode of the air conditioning unit to the bottom air outlet mode, and then obtain the bottom air outlet temperature T. 下风口出风 According to the outlet air temperature T 下风口出风 With user comfort temperature T 舒适 The relationship between the two is used to determine whether the air conditioning unit has switched from bottom air outlet mode to top air outlet mode. Then, after the air conditioning unit switches from bottom air outlet mode to top air outlet mode, the top air outlet temperature T is obtained. 上风口 and the lower air inlet temperature T of the lower air outlet 下风口进风 According to the upper air outlet temperature T上风口 Lower air inlet temperature T 下风口进风 The relationship between the air conditioner and the first preset difference ΔT1 determines whether the air conditioner has entered defrost mode. Thus, before defrosting, the indoor unit's operating mode is adjusted to a down-discharge mode, allowing the heat stored in the indoor heat exchanger to be blown into the room through the down-discharge airflow. This avoids cold air blowing directly onto the user and affecting their experience. The heat from the indoor heat exchanger heats the air outlet from the indoor unit, effectively utilizing the stored heat. This solves the problem of ineffective heat utilization in existing defrost methods, preventing heat waste and improving energy efficiency.

[0082] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0083] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0084] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0085] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for controlling an air conditioning device, characterized in that, The air conditioning unit has a down-discharge mode where air is discharged through the down-discharge vent of the indoor unit, an up-discharge mode where air is discharged through the up-discharge vent of the indoor unit, and a defrost mode. The air conditioning unit control method includes a pre-defrost control method, which includes: Step S1: Adjust the operating mode of the air conditioning unit to the down-ventilation mode; Step S2: Obtain the lower air outlet temperature T. 下风口出风 According to the aforementioned outlet air temperature T 下风口出风 With user comfort temperature T 舒适 The relationship between the air conditioning unit and the air outlet mode determines whether the air conditioning unit has switched from the bottom air outlet mode to the top air outlet mode. Step S3: After the air conditioning unit switches from the downward air outlet mode to the upward air outlet mode, the upward air outlet temperature T is obtained. 上风口 and the lower air inlet temperature T of the lower air outlet 下风口进风 According to the aforementioned upper air outlet temperature T 上风口 The lower air inlet temperature T 下风口进风 The relationship between the air conditioner and the first preset difference ΔT1 determines whether the air conditioner has entered the defrost mode.

2. The air conditioning device control method according to claim 1, characterized in that, According to the lower outlet air temperature T 下风口出风 With user comfort temperature T 舒适 The method for determining whether the air conditioning unit has switched from the down-discharge mode to the up-discharge mode based on the relationship between the two modes includes: If T 下风口出风 ≤T 舒适 If the air conditioner switches from the downward air outlet mode to the upward air outlet mode, then the air conditioning unit is controlled to switch from the downward air outlet mode to the upward air outlet mode; otherwise, the downward air outlet temperature T of the downward air outlet continues to be monitored. 下风口出风 .

3. The air conditioning device control method according to claim 1, characterized in that, The indoor unit of the air conditioner includes an indoor heat exchanger, a first indoor fan, and a second indoor fan. The first indoor fan is located near the upper air outlet, and the second indoor fan is located near the lower air outlet. The upper air outlet temperature T is used as the basis for the measurement. 上风口 The lower air inlet temperature T 下风口进风 The method for determining whether the air conditioning unit has entered the defrost mode based on the relationship between the value and the first preset difference ΔT1 includes: If T 上风口 -T 下风口进风 If the temperature is ≤ΔT1, the first internal fan stops running, and the air conditioning unit enters the defrost mode; otherwise, the upper air outlet temperature T continues to be monitored. 上风口 and the lower air inlet temperature T of the lower air outlet 下风口进风 .

4. The air conditioning device control method according to claim 3, characterized in that, In step S1, the second internal fan is controlled to operate at a minimum speed value X. min run.

5. The air conditioning device control method according to claim 3, characterized in that, In step S2, when the air conditioning unit switches to the top air outlet mode, the first indoor fan is controlled to operate at its minimum speed value S. min run.

6. The air conditioning device control method according to claim 3, characterized in that, The air conditioning unit control method further includes a control method after the air conditioning unit completes defrosting, the control method after the air conditioning unit completes defrosting includes: Step S4: Control the air conditioning unit to switch to heating mode; Step S5: Obtain the temperature T of the indoor heat exchanger 内管 The lower air outlet temperature T 下风口出风 According to the temperature T of the indoor heat exchanger 内管 The lower air outlet temperature T 下风口出风 The relationship between the air conditioner and the second preset difference ΔT2 determines whether the air conditioning device enters the top air outlet mode; Step S6: Obtain the upper air outlet temperature T. 上风口 According to the upper air outlet temperature T 上风口 With preset temperature T 预设 The relationship between the two factors determines whether to adjust the speed of the first internal fan.

7. The air conditioning device control method according to claim 6, characterized in that, According to the temperature T of the indoor heat exchanger 内管 The lower air outlet temperature T 下风口出风 The method for determining whether the air conditioning unit has entered the top air outlet mode based on the relationship between the second preset difference ΔT2 and the second preset difference includes: If T 内管 -T 下风口出风 If the value is greater than ΔT2, then the air conditioning unit is controlled to enter the top air outlet mode and the first indoor fan is controlled to operate at the minimum speed value S. min run.

8. The air conditioning device control method according to claim 6, characterized in that, According to the upper air outlet temperature T 上风口 With preset temperature T 预设 The methods for determining whether to adjust the speed of the first internal fan based on the relationship between the two include: If T 上风口 >T 预设 Then the speed of the first internal fan will be increased to speed X.

9. The air conditioning device control method according to claim 6, characterized in that, The control method for the air conditioning unit after defrosting also includes a step S7 following step S6, wherein step S7 includes: Obtain the upper air outlet temperature T. 上风口 According to the upper air outlet temperature T 上风口 and the user comfort temperature T 舒适 The relationship between the two determines whether to switch back to the control mode before entering defrost.

10. The air conditioning device control method according to claim 9, characterized in that, According to the upper air outlet temperature T 上风口 and the user comfort temperature T 舒适 The methods for determining whether to switch back to the control mode before defrosting based on the relationship between the two modes include: If T 上风口 >T 舒适 Then the air conditioning unit will switch back to the control mode before entering defrost.

11. The air conditioning device control method according to claim 1, characterized in that, The outdoor unit of the air conditioning system includes a compressor, an outdoor fan, and a four-way valve. The compressor is connected to the four-way valve and the indoor unit of the air conditioning system via a pipeline. The pre-defrosting control method of the air conditioning system also includes a step S0 located before step S1. The compressor and the outdoor fan are stopped, and the four-way valve is switched to switch the air conditioning unit from heating mode to cooling mode.

12. The air conditioning device control method according to claim 1, characterized in that, The indoor unit of the air conditioning unit includes an indoor fan, and the outdoor unit includes a compressor, an outdoor fan, a four-way valve, and an electronic expansion valve. The compressor is connected to the four-way valve and the indoor unit via a pipeline. The pre-defrosting control method for the air conditioning unit further includes a step S0 prior to step S1. The internal and external fans are stopped, and the opening of the electronic expansion valve is adjusted to the maximum value.

13. The air conditioning device control method according to claim 1, characterized in that, The indoor unit of the air conditioning system includes an indoor fan, and the outdoor unit includes a compressor, an outdoor fan, a four-way valve, a hot gas bypass two-way valve, and an outdoor heat exchanger. The compressor is connected to the four-way valve and the indoor unit via a pipeline. The pre-defrosting control method for the air conditioning system further includes a step S0 prior to step S1. The internal and external fans are stopped, and the hot gas bypass two-way valve is opened to allow gas to enter the outdoor heat exchanger through the hot gas bypass two-way valve.

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