Air conditioner outdoor unit and control method thereof

Abstract

The invention relates to the technical field of air conditioners, and aims to solve the technical problem that the working performance of an air conditioner is reduced due to the fact that a cooling fan of a compressor still cannot meet the cooling requirement of the compressor. The invention provides an air conditioner outdoor unit and a control method thereof.The air conditioner outdoor unit comprises a press cooling fan, the press cooling fan is arranged on a machine shell, and the press cooling fan is used for promoting forming of press cooling airflow flowing through a compressor to conduct cooling on the compressor; the control method comprises the steps that in a refrigeration mode, after a press cooling fan is started, the environment temperature of the space where the air conditioner outdoor unit is located is obtained; whether the environment temperature is larger than a first preset temperature threshold value or not is judged; if yes, operation state parameters of the outdoor unit heat exchange system are obtained; and the rotating speed gear of the press cooling fan is set according to the running state parameters and the environment temperature. According to the air conditioner outdoor unit and the control method thereof, the technical problems are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to an air conditioner outdoor unit and a control method thereof. Background Art

[0002] With the development of science and technology, the number of air conditioners is increasing, and people's demand for them has become indispensable. Especially in summer, air conditioners can create a cool indoor space environment for users. However, in the high temperature environment in summer, the ambient temperature of the outdoor unit can reach above 48°C, which will make the temperature inside the compressor compartment of the air conditioner outdoor unit higher, and then the temperature of the compressor will increase, further causing the compressor exhaust temperature to be too high / the condensing pressure of the refrigeration cycle system to be too high. Finally, the compressor will reduce the frequency or even shut down, resulting in poor refrigeration performance of the air conditioner, affecting the user experience.

[0003] At present, in the prior art, there is a technical solution of opening an air inlet on the front side of the casing at a position directly opposite to the compressor and setting a heat dissipation fan on the air inlet. When the temperature around the compressor rises to a predetermined value, the heat dissipation fan is turned on to dissipate heat for the compressor. However, although the values ​​of the ambient temperature and the exhaust temperature are both high, the heat dissipation requirements of the compressor are different for different degrees of high temperature. As a result, the heat dissipation fan still cannot meet the heat dissipation requirements of the air-conditioning compressor (compartment), resulting in reduced working performance of the air conditioner. For example, when the temperature in the compressor compartment continues to rise, if the speed of the heat dissipation fan does not increase, the air conditioner will still experience frequency reduction or shutdown; when the temperature in the compressor compartment decreases, if the speed of the heat dissipation fan does not decrease, the heat dissipation fan will waste electricity, affecting the energy saving of the air conditioner, and even causing insufficient condensation pressure for outdoor heat exchange, all of which will lead to poor refrigeration performance of the air conditioner. Summary of the invention

[0004] An object of the present invention is to provide an air conditioner outdoor unit and a control method thereof which can overcome at least one of the above-mentioned defects in the prior art.

[0005] A further object of the present invention is to provide a method for adaptively regulating the rotation speed of a heat dissipation fan to meet the heat dissipation requirements of the compressor and ensure the working performance of the air conditioner.

[0006] In particular, the present invention provides a control method for an air-conditioning outdoor unit, wherein the air-conditioning outdoor unit comprises:

[0007] chassis;

[0008] An outdoor unit heat exchange system is arranged in the casing, and the outdoor unit heat exchange system includes a compressor and an outdoor unit heat exchanger arranged at intervals;

[0009] A compressor cooling fan, disposed on the housing, for causing a compressor cooling airflow to flow through the compressor to dissipate heat therefrom; and

[0010] Control methods include:

[0011] In cooling mode and after the compressor cooling fan is turned on, obtain the ambient temperature of the space where the air conditioner outdoor unit is located;

[0012] Determining whether the ambient temperature is greater than a first preset temperature threshold;

[0013] If yes, obtain the operating status parameters of the outdoor unit heat exchange system;

[0014] Set the speed of the compressor cooling fan according to the operating status parameters and ambient temperature.

[0015] Further, the operating state parameters include the exhaust temperature of the compressor and the external coil temperature of the outdoor unit heat exchanger; and,

[0016] The steps of setting the speed level of the compressor cooling fan according to the operating status parameters and the ambient temperature include:

[0017] Calculate the temperature difference between the exhaust temperature and the external coil temperature;

[0018] Set the speed of the compressor cooling fan according to the temperature difference and ambient temperature.

[0019] Further, the step of setting the speed gear of the compressor cooling fan according to the temperature difference and the ambient temperature includes:

[0020] Determining whether the ambient temperature is less than or equal to a second preset temperature threshold;

[0021] If so, determining whether the temperature difference is less than or equal to a first preset temperature difference threshold;

[0022] When the temperature difference is less than or equal to the first preset temperature difference threshold, the speed gear of the compressor cooling fan is configured to be the first gear;

[0023] When the temperature difference is greater than the first preset temperature difference threshold, the speed gear of the compressor cooling fan is configured to be the second gear, wherein the speed of the second gear is higher than the speed of the first gear.

[0024] Furthermore, when the ambient temperature is greater than the second preset temperature threshold, the step of setting the speed gear of the compressor cooling fan according to the temperature difference and the ambient temperature also includes:

[0025] Determine whether the temperature difference is less than or equal to a second preset temperature difference threshold;

[0026] If yes, set the compressor cooling fan speed gear to the first gear;

[0027] If not, the speed gear of the compressor cooling fan is configured to be the third gear, wherein the speed of the third gear is higher than the speed of the second gear.

[0028] Further, after the step of configuring the speed gear of the compressor cooling fan to the second gear, the control method further includes:

[0029] Control the cooling fan to run at the second gear for a first preset time;

[0030] Evaluate whether the temperature difference can be stably maintained below a first preset temperature difference threshold;

[0031] If yes, executing the step of configuring the speed gear of the compressor cooling fan to the first gear;

[0032] If not, the compressor cooling fan is controlled to operate at the second gear, and the process returns to the step of evaluating whether the temperature difference can be stably maintained below the first preset temperature difference threshold.

[0033] Further, the step of evaluating whether the temperature difference can be stably maintained below a first preset temperature difference threshold comprises:

[0034] Acquiring the exhaust gas temperature and the external coil temperature multiple times at intervals of a second preset time, and calculating multiple temperature differences;

[0035] Determine whether the multiple temperature differences are all less than or equal to a first preset temperature difference threshold;

[0036] If so, determining that the temperature difference can be stably maintained below a first preset temperature difference threshold;

[0037] If not, it is determined that the temperature difference cannot be stably maintained below the first preset temperature difference threshold.

[0038] Further, after the step of configuring the speed gear of the compressor cooling fan to the third gear, the control method further includes:

[0039] Control the cooling fan to run at the third gear for a first preset time;

[0040] evaluating whether the temperature difference can be stably maintained below a second preset temperature difference threshold;

[0041] If yes, switch the speed gear of the compressor cooling fan to the second gear;

[0042] If not, the compressor cooling fan is controlled to operate at the third gear, and the process returns to the step of evaluating whether the temperature difference can be stably maintained below the second preset temperature difference threshold.

[0043] Further, the step of evaluating whether the temperature difference can be stably maintained below a second preset temperature difference threshold comprises:

[0044] Acquiring the exhaust gas temperature and the external coil temperature multiple times at intervals of a second preset time, and calculating multiple temperature differences;

[0045] Determine whether the multiple temperature differences are all less than or equal to a second preset temperature difference threshold;

[0046] If so, determining that the temperature difference can be stably maintained below a second preset temperature difference threshold;

[0047] If not, it is determined that the temperature difference cannot be stably maintained below the second preset temperature difference threshold.

[0048] Furthermore, the air conditioner outdoor unit comprises:

[0049] An ambient temperature sensor is provided on the casing / adjacent to the casing and is used to detect the space temperature of the space where the air conditioner outdoor unit is located;

[0050] The steps for obtaining the ambient temperature of the space where the air conditioner outdoor unit is located include:

[0051] Control the ambient temperature sensor to detect the space temperature;

[0052] Correct the deviation of space temperature caused by the proximity of the ambient temperature sensor to the outdoor unit heat exchanger;

[0053] Determine the corrected space temperature as the ambient temperature.

[0054] The present invention also provides an air conditioner outdoor unit, comprising:

[0055] The controller includes a memory and a processor, wherein the memory stores a machine executable program, and when the executable program is executed by the processor, the control method of the air conditioner outdoor unit is implemented.

[0056] In the control method of the air conditioner outdoor unit of the present invention, when the ambient temperature is greater than the first preset temperature threshold, the compressor heat dissipation fan can adaptively configure the speed gear according to the operating state parameters of the outdoor unit heat exchange system and the ambient temperature, so that the heat dissipation fan can match the different heat dissipation requirements of the compressor under different ambient temperatures and different states of the outdoor unit heat exchange system. Therefore, the control method of the air conditioner outdoor unit of the present invention can adaptively adjust the speed of the heat dissipation fan to meet the heat dissipation requirements of the compressor and ensure the working performance of the air conditioner.

[0057] Further, the control method of the air-conditioning outdoor unit of the present invention can configure the speed gear of the compressor cooling fan to the first gear when the ambient temperature is less than or equal to the second preset temperature threshold and the temperature difference is less than or equal to the first preset temperature difference threshold, or when the ambient temperature is greater than the second preset temperature threshold and the temperature difference is less than or equal to the second preset temperature difference threshold; and, when the ambient temperature is less than or equal to the second preset temperature threshold and the temperature difference is greater than the first preset temperature difference threshold, the speed gear of the compressor cooling fan can be configured to the second gear; and, when the ambient temperature is greater than the second preset temperature threshold and the temperature difference is greater than the second preset temperature difference threshold, the speed gear of the compressor cooling fan can be configured to the third gear. That is, the control method of the present invention can reduce the speed of the cooling fan in a relatively low high temperature environment and a relatively low exhaust temperature, or in a relatively high temperature environment and a relatively low exhaust temperature, so as to avoid waste of electric energy, ensure the energy-saving performance of the air conditioner, and ensure the condensing pressure of outdoor heat exchange, and ensure the refrigeration performance of the air conditioner; and increase the speed of the cooling fan in a relatively low high temperature environment and a relatively high exhaust temperature, or increase the speed of the cooling fan further in a relatively high temperature environment and a relatively high exhaust temperature, so as to effectively avoid frequency reduction or shutdown of the compressor, and ensure the refrigeration performance of the air conditioner.

[0058] The air-conditioning outdoor unit of the present invention can realize the above-mentioned control method of the air-conditioning outdoor unit, and thus the air-conditioning outdoor unit of the present invention also has the beneficial technical effects that can be achieved by the above-mentioned control method of the air-conditioning outdoor unit.

[0059] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0061] Figure 1 is a schematic structural diagram of an air-conditioning outdoor unit according to an embodiment of the present invention;

[0062] Figure 2 is a schematic diagram of the internal structure of an air conditioner outdoor unit according to an embodiment of the present invention;

[0063] Figure 3 is a schematic diagram of a frame connection of an air conditioner outdoor unit according to an embodiment of the present invention;

[0064] Figure 4is a flow chart of a method for controlling an outdoor unit of an air conditioner according to an embodiment of the present invention;

[0065] Figure 5 is a flow chart of a control method for an outdoor unit of an air conditioner according to another embodiment of the present invention;

[0066] Figure 6 is a flow chart of a control method for an outdoor unit of an air conditioner according to yet another embodiment of the present invention;

[0067] Figure 7 is a flow chart of evaluating whether the temperature difference can be stably maintained below a first preset temperature difference threshold in a control method for an air-conditioning outdoor unit according to an embodiment of the present invention;

[0068] Figure 8 It is a flow chart of evaluating whether the temperature difference can be stably maintained below a second preset temperature difference threshold in a control method of an air conditioner outdoor unit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0069] In the description of this embodiment, it is necessary to understand that the terms "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0070] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0071] Unless otherwise clearly defined and limited, the terms "disposed", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. A person skilled in the art should be able to understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0072] In addition, in the description of this embodiment, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. That is, in the description of this embodiment, the first feature being "above", "above", and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below", or "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0073] Unless otherwise defined, all terms (including technical terms and scientific terms) used in the description of this embodiment have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0074] In the description of the present embodiment, the description with reference to the terms "present embodiment", "some variant embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0075] Combine the following Figures 1 to 3 The air conditioner outdoor unit of this embodiment will be described in detail.

[0076] Reference Figure 1 and Figure 2 In this embodiment, the air conditioner outdoor unit may include a casing 100 , an outdoor unit heat exchange system 200 and a compressor heat dissipation fan 230 .

[0077] The outdoor heat exchange system 200 is disposed in the casing 100 , and the outdoor heat exchange system 200 may include a compressor 210 and an outdoor heat exchanger 220 that are spaced apart.

[0078] The compressor cooling fan 230 is disposed on the housing 100 , and is used to facilitate the formation of a compressor cooling airflow that flows through the compressor 210 to dissipate heat therefrom.

[0079] It is understandable that the air conditioner outdoor unit may include a partition 140, which is disposed in the housing 100 to separate the internal space of the housing 100 into two relatively independent spaces, and the outdoor unit heat exchanger 220 and the compressor 210 are respectively located in the two relatively independent spaces. The independent space for placing the compressor 210 may be a compressor compartment 150.

[0080] Reference Figure 1 and Figure 2 In this embodiment, the housing 100 may be provided with a heat exchange air inlet (not shown in the figure because it is located at the rear of the housing) and a heat exchange air outlet 110, and the outdoor unit heat exchange system 200 may further include a heat exchange fan 240, which is arranged at the heat exchange air inlet and / or the heat exchange air outlet 110 corresponding to the outdoor unit heat exchanger 220 to guide the air flow outside the housing 100 to enter the housing 100 and pass through the outdoor unit heat exchanger 220 and then flow out of the housing 100. Then, when the air conditioner is to run the heating mode, the outdoor unit heat exchanger 220 can be used as an evaporator to evaporate the circulating refrigerant, and the evaporated refrigerant can flow back to the compressor 210; when the air conditioner is to run the cooling mode, the outdoor unit heat exchanger 220 can be used as a condenser to condense the circulating refrigerant to prepare for the evaporation process of the indoor unit of the air conditioner, and complete the cooling function of the air conditioner.

[0081] Reference Figure 1 and Figure 2 In this embodiment, the housing 100 may be provided with a compressor heat dissipation fan 230 to dissipate heat from the compressor 210 and ensure the cooling performance of the air conditioner when operating in the cooling mode. For example, the housing 100 may be provided with a heat dissipation air inlet 120 and a heat dissipation air outlet 130, and the compressor heat dissipation fan 230 is arranged at the heat dissipation air inlet 120 and / or the heat dissipation air outlet 130.

[0082] Referring to 3 , in the present embodiment, the air conditioner outdoor unit may include a controller 300 .

[0083] The controller 300 may include a memory 310 and a processor 320 , wherein the memory 310 stores a machine executable program 311 , and when the executable program is executed by the processor 320 , the control method of the air conditioner outdoor unit of the following embodiment is implemented.

[0084] The air-conditioning outdoor unit of this embodiment can implement the control method of the air-conditioning outdoor unit of the following embodiments, and thus the air-conditioning outdoor unit of this embodiment also has the beneficial technical effects that can be achieved by the control method of the air-conditioning outdoor unit of the following embodiments.

[0085] Referring to 3 , in this embodiment, the air conditioner outdoor unit may include an ambient temperature sensor 330 .

[0086] The ambient temperature sensor 330 is disposed on the housing 100 or adjacent to the housing 100 , and is used to detect the space temperature of the space where the air conditioner outdoor unit is located. The ambient temperature sensor 330 is electrically connected to the controller 300 .

[0087] Combine the following Figures 4 to 8 The control method of the air conditioner outdoor unit of this embodiment is described in detail.

[0088] Figure 4 FIG. 1 is a flow chart of a control method for an air conditioner outdoor unit according to an embodiment of the present invention. In this embodiment, the control method for an air conditioner outdoor unit includes:

[0089] Step S402, in cooling mode and after the compressor cooling fan is turned on, the ambient temperature of the space where the air conditioner outdoor unit is located is obtained.

[0090] Step S404, determining whether the ambient temperature is greater than a first preset temperature threshold; if so, executing step S406.

[0091] Step S406, obtaining the operating state parameters of the outdoor unit heat exchange system. The operating state parameters may include the exhaust temperature of the compressor and the external coil temperature of the outdoor unit heat exchanger in the following embodiments, and may also include the compressor temperature.

[0092] Step S408, setting the speed gear of the compressor cooling fan according to the operating state parameters and the ambient temperature. This step may include steps S508 to S510 in the following embodiments.

[0093] In the control method of the air conditioner outdoor unit of this embodiment, when the ambient temperature is greater than the first preset temperature threshold, the compressor heat dissipation fan can adaptively configure the speed gear according to the operating state parameters of the outdoor unit heat exchange system and the ambient temperature, so that the heat dissipation fan can match the different heat dissipation requirements of the compressor under different ambient temperatures and different states of the outdoor unit heat exchange system. Therefore, the control method of the air conditioner outdoor unit of this embodiment can adaptively adjust the speed of the heat dissipation fan to meet the heat dissipation requirements of the compressor and ensure the working performance of the air conditioner.

[0094] In addition, in this embodiment, the control method of the air conditioner outdoor unit may include executing steps before step S402 or turning off the compressor cooling fan when it is determined that the ambient temperature is less than or equal to the first preset temperature threshold.

[0095] Figure 5 is a flow chart of a control method for an air conditioner outdoor unit according to another embodiment of the present invention; in this embodiment, the control method for an air conditioner outdoor unit includes:

[0096] Step S502, in cooling mode and after the compressor cooling fan is turned on, the ambient temperature of the space where the air conditioner outdoor unit is located is obtained.

[0097] Step S504, determining whether the ambient temperature is greater than a first preset temperature threshold; if so, executing step S506.

[0098] Step S506, obtaining the operating state parameters of the outdoor unit heat exchange system; the operating state parameters may include the exhaust temperature of the compressor and the external coil temperature of the outdoor unit heat exchanger.

[0099] Step S508, calculating the temperature difference between the exhaust temperature and the external coil temperature.

[0100] Step S510, setting the speed gear of the compressor cooling fan according to the temperature difference and the ambient temperature. This step may include steps S614 to S620 and steps S628 to S630 in the following embodiments.

[0101] It can be understood that the temperature difference between the exhaust temperature and the external coil temperature can be used to measure whether the exhaust temperature of the compressor is too high. Therefore, the control method of the air-conditioning outdoor unit of this embodiment can set the speed gear of the compressor cooling fan according to the temperature difference and the ambient temperature when the ambient temperature is greater than the first preset temperature threshold, so that the cooling fan can match the different heat dissipation requirements of the compressor under different ambient temperatures and different exhaust temperatures, thereby ensuring the refrigeration performance of the air conditioner.

[0102] Figure 6 4 is a flow chart of a method for controlling an outdoor unit of an air conditioner according to yet another embodiment of the present invention.

[0103] In this embodiment, the control method of the air conditioner outdoor unit includes:

[0104] Step S602, in cooling mode and after the compressor cooling fan is turned on, the ambient temperature sensor is controlled to detect the space temperature.

[0105] Step S604, correcting the deviation of the space temperature caused by the ambient temperature sensor being close to the outdoor heat exchanger.

[0106] Step S606, determining that the corrected space temperature is the ambient temperature.

[0107] Step S608, determine whether the ambient temperature is greater than a first preset temperature threshold; if so, execute step S610. If not, execute the steps before step S602, or turn off the compressor cooling fan.

[0108] Step S610, obtaining operating state parameters of the outdoor unit heat exchange system; the operating state parameters include the exhaust temperature of the compressor and the external coil temperature of the outdoor unit heat exchanger.

[0109] Step S612, calculating the temperature difference between the exhaust temperature and the external coil temperature.

[0110] Step S614, determining whether the ambient temperature is less than or equal to a second preset temperature threshold. If so, executing step S616; if not, executing step S628.

[0111] Step S616, determining whether the temperature difference is less than or equal to a first preset temperature difference threshold. If the temperature difference is less than or equal to the first preset temperature difference threshold, execute step S618; if the temperature difference is greater than the first preset temperature difference threshold, execute step S620.

[0112] Step S618, configure the speed gear of the compressor cooling fan to the first gear; and after executing this step, you can return to execute step S602, and you can also control the compressor cooling fan to continue running at the first gear.

[0113] Step S620, configuring the speed gear of the compressor cooling fan to the second gear, wherein the speed of the second gear is higher than the speed of the first gear.

[0114] Step S622, controlling the cooling fan to run at the second gear for a first preset time period.

[0115] Step S624, evaluating whether the temperature difference can be stably maintained below the first preset temperature difference threshold. If so, executing the step of configuring the compressor cooling fan speed gear to the first gear, that is, executing step S618; if not, executing step S626.

[0116] Step S626, control the compressor cooling fan to operate at the second gear, and return to the step of evaluating whether the temperature difference can be stably maintained below the first preset temperature difference threshold, that is, return to execute step S624.

[0117] Step S628, determining whether the temperature difference is less than or equal to a second preset temperature difference threshold. If so, executing step S618; if not, executing step S630.

[0118] Step S630, configuring the speed gear of the compressor cooling fan to the third gear, wherein the speed of the third gear is higher than the speed of the second gear.

[0119] Step S632, controlling the cooling fan to run at the third gear for a first preset time period.

[0120] Step S634, evaluating whether the temperature difference can be stably maintained below a second preset temperature difference threshold; if so, executing step S636; if not, executing step S638.

[0121] Step S636, switching the speed gear of the compressor cooling fan to the second gear. After executing step S636, the process can return to step S602, and the compressor cooling fan can be controlled to continue to run at the second gear.

[0122] Step S638, control the compressor cooling fan to operate at the third gear, and return to the step of evaluating whether the temperature difference can be stably maintained below the second preset temperature difference threshold, that is, return to step S634.

[0123] It can be understood that the control method of this embodiment, through the execution of steps S610 to S616 and steps S628 to S630, can configure the speed gear of the compressor cooling fan to the first gear when the ambient temperature is less than or equal to the second preset temperature threshold and the temperature difference is less than or equal to the first preset temperature difference threshold, or when the ambient temperature is greater than the second preset temperature threshold and the temperature difference is less than or equal to the second preset temperature difference threshold; and, when the ambient temperature is less than or equal to the second preset temperature threshold and the temperature difference is greater than the first preset temperature difference threshold, the speed gear of the compressor cooling fan can be configured to the second gear; and, when the ambient temperature is greater than the second preset temperature threshold and the temperature difference is greater than the second preset temperature difference threshold, the speed gear of the compressor cooling fan can be configured to the third gear. That is, the control method of this embodiment can reduce the speed of the cooling fan in a relatively low high temperature environment and a relatively low exhaust temperature, or in a relatively high temperature environment and a relatively low exhaust temperature, to avoid wasting electric energy, ensure the energy-saving performance of the air conditioner, and ensure the condensing pressure of outdoor heat exchange and the cooling performance of the air conditioner; and increase the speed of the compressor cooling fan in a relatively low high temperature environment and a relatively high exhaust temperature, or increase the speed of the compressor cooling fan further in a relatively high temperature environment and a relatively high exhaust temperature, to effectively avoid frequency reduction or shutdown of the compressor and ensure the cooling performance of the air conditioner.

[0124] Among them, the speed value of the first gear can range from 200 rpm to 400 rpm, for example, 200 rpm, 250 rpm, 300 rpm, 350 rpm, 400 rpm, etc., and the speed value of the first gear is preferably 300 rpm; the speed value of the second gear can range from 400 rpm to 600 rpm, for example, 400 rpm, 450 rpm, 500 rpm, 550 rpm, 600 rpm, etc., and the speed value of the second gear is preferably 500 rpm; the speed value of the third gear can range from 700 rpm to 900 rpm, for example, 700 rpm, 750 rpm, 800 rpm, 850 rpm, 900 rpm, etc., and the speed value of the third gear is preferably 800 rpm. The above preferred speed values ​​can enable the above control method to ensure the energy-saving performance of the air conditioner and the realization of the beneficial technical effect of the refrigeration performance. It should be noted that the specific values ​​listed above are only preferred embodiments, and the speed values ​​of the first gear, the second gear, and the third gear can be specifically set according to actual conditions or experimental data. It cannot be considered that the speed values ​​of the first gear, the second gear, and the third gear in this embodiment can only be set to the above-listed values.

[0125] In addition, during the execution of steps S618, S620 and S630, the speed of the compressor cooling fan can be adjusted to the first gear, the second gear and the third gear at a speed of 5 revolutions per second to ensure the stability of the compressor cooling fan configuration process.

[0126] In this embodiment, step S622 can reduce the temperature difference between the exhaust temperature and the external coil temperature to below the first preset temperature difference threshold to ensure the cooling performance of the air conditioner. And through step S632, the temperature difference between the exhaust temperature and the external coil temperature can be reduced to below the second preset temperature difference threshold to ensure the cooling performance of the air conditioner.

[0127] Among them, the range of the first preset duration can be 10-20 minutes, such as 10 minutes, 12 minutes, 14 minutes, 15 minutes, 16 minutes, 18 minutes, 20 minutes, etc. And the first preset duration can be preferably 15 minutes, so as to effectively ensure that the temperature difference can be reduced to below the first preset temperature difference threshold. The specific numerical values ​​listed above are only preferred embodiments, and the first preset duration can be specifically set according to actual conditions or experimental data. It cannot be considered that the first preset duration of this embodiment can only be set to the numerical values ​​listed above.

[0128] In this embodiment, steps S624 to S626 can evaluate whether the temperature difference can be stably maintained below the first preset temperature difference threshold. If the temperature difference can be stably maintained below the first preset temperature difference threshold, the speed gear of the compressor cooling fan can be reduced to further ensure the energy-saving performance of the air conditioner and further ensure the condensing pressure of the outdoor heat exchange; if not, the compressor cooling fan can be controlled to continue to operate at the second gear to reduce the temperature difference between the exhaust temperature and the external coil temperature to below the first preset temperature difference threshold, further avoiding the compressor from reducing frequency or shutting down, and further ensuring the refrigeration performance of the air conditioner.

[0129] In this embodiment, steps S634 to S638 can evaluate whether the temperature difference can be stably maintained below the second preset temperature difference threshold. If so, the speed gear of the compressor cooling fan can be reduced to further ensure the energy-saving performance of the air conditioner and further ensure the condensing pressure of the outdoor heat exchange. If not, the compressor cooling fan can be controlled to continue to operate at the third gear to reduce the temperature difference between the exhaust temperature and the external coil temperature to below the second preset temperature difference threshold, further avoiding the compressor from reducing frequency or shutting down, and further ensuring the refrigeration performance of the air conditioner.

[0130] In this embodiment, steps S602 to S606 can correct the deviation of the space temperature caused by the proximity of the ambient temperature sensor to the outdoor unit heat exchanger. For example, the ambient temperature can be obtained by subtracting the correction amount from the space temperature. And the correction amount can range from 0.1°C to 2°C, for example, 0.5°C, 1°C, 1.5°C, 2°C, etc. And the correction amount can preferably be 1°C. It should be noted that the specific numerical values ​​listed above are only preferred embodiments, and the correction amount can be specifically set according to actual conditions or experimental data. It cannot be considered that the correction amount of this embodiment can only be set to the numerical values ​​listed above.

[0131] In addition, the air conditioner outdoor unit starts running step S602 after running the cooling mode for 2 minutes to 10 minutes (for example, 2 minutes, 4 minutes, 5 minutes, 6 minutes, 8 minutes, 10 minutes, and preferably 5 minutes, to effectively ensure that the operating state of the air conditioner outdoor unit is relatively stable at this time). During this period, the compressor cooling fan can be operated according to the preset gear, wherein the speed of the preset gear can be greater than the speed of the first gear and less than the speed of the second gear. It should be noted that the specific values ​​listed above are only preferred embodiments, and the time between the air conditioner outdoor unit after it is turned on and the start of step S602 can be specifically set according to actual conditions or experimental data, and it cannot be considered that it can only be set to the values ​​listed above.

[0132] In some variant embodiments, the operating state parameter may include the compressor temperature. The control method of the air conditioner outdoor unit may include setting the speed gear of the compressor cooling fan according to the compressor temperature and the ambient temperature.

[0133] For example, the step of setting the speed gear of the compressor cooling fan according to the compressor temperature and the ambient temperature may include determining whether the ambient temperature is less than or equal to a second preset temperature threshold, and determining whether the compressor temperature is less than or equal to a first preset compressor temperature threshold when the ambient temperature is less than or equal to the second preset temperature threshold. If the compressor temperature is less than or equal to the first preset compressor temperature threshold, the speed gear of the compressor cooling fan can be configured to the first gear; if the compressor temperature is greater than the first preset compressor temperature threshold, the speed gear of the compressor cooling fan can be configured to the second gear.

[0134] In this variant embodiment, the step of setting the speed gear of the compressor cooling fan according to the compressor temperature and the ambient temperature may also include determining whether the compressor temperature is less than or equal to a second preset compressor temperature threshold when the ambient temperature is greater than the second preset temperature threshold; if the compressor temperature is less than or equal to the second preset compressor temperature threshold, the speed gear of the compressor cooling fan can be configured to the first gear; if the compressor temperature is greater than the second preset compressor temperature threshold, the speed gear of the compressor cooling fan can be configured to the third gear.

[0135] In this variant embodiment, the heat dissipation fan can also match the different heat dissipation requirements of the compressor under different ambient temperatures and different states of the outdoor unit heat exchange system, meet the heat dissipation requirements of the compressor, and ensure the working performance of the air conditioner.

[0136] In some other variant embodiments, the difference from the aforementioned embodiment is that the exhaust gas temperature can be replaced by the compressor temperature.

[0137] Figure 7 1 is a flow chart of evaluating whether the temperature difference can be stably maintained below a first preset temperature difference threshold in a control method of an air conditioner outdoor unit according to an embodiment of the present invention. In this embodiment, the step of evaluating whether the temperature difference can be stably maintained below the first preset temperature difference threshold includes:

[0138] Step S702: acquiring the exhaust gas temperature and the external coil temperature multiple times at intervals of a second preset time, and calculating multiple temperature differences.

[0139] Step S704, determining whether the multiple temperature differences are all less than or equal to a first preset temperature difference threshold; if so, executing step S706; if not, executing step S708.

[0140] Step S706, determining whether the temperature difference can be stably maintained below a first preset temperature difference threshold.

[0141] Step S708: determining that the temperature difference cannot be stably maintained below a first preset temperature difference threshold.

[0142] It is understandable that by determining at intervals whether the temperature difference is less than or equal to the first preset temperature difference threshold value for multiple times, it can be determined that the temperature difference can be stably maintained below the first preset temperature difference threshold value. If the results of multiple determinations are all yes, it indicates that the exhaust temperature of the compressor can be continuously stabilized at a lower temperature, and it can be determined that the temperature difference can be stably maintained below the first preset temperature difference threshold value. If the result of one determination is no, it indicates that the exhaust temperature of the compressor is not stable enough and may become higher.

[0143] The second preset time length may range from 30 seconds to 2 minutes, such as 30 seconds, 1 minute, 1.5 minutes, 2 minutes, etc. And the second preset time length may preferably be 1 minute, so that the control method of this embodiment can timely evaluate whether the temperature difference is less than or equal to the first preset temperature difference threshold, ensure the energy saving of the air conditioner outdoor unit, and avoid too frequent acquisition of the stability difference. It should be noted that the specific values ​​listed above are only preferred embodiments, and the second preset time length can be specifically set according to actual conditions or experimental data, and it cannot be considered that it can only be set to the values ​​listed above.

[0144] In addition, in some alternative embodiments, the step of evaluating whether the temperature difference can be stably maintained below the first preset temperature difference threshold may include continuously detecting the exhaust temperature and the external coil temperature, calculating the temperature difference between the exhaust temperature and the external coil temperature, and judging whether the temperature difference can be less than or equal to the first preset temperature difference threshold for a predetermined period of time. And the step of evaluating whether the temperature difference can be stably maintained below the first preset temperature difference threshold may also include judging that the temperature difference can be stably maintained below the first preset temperature difference threshold when the temperature difference can be less than or equal to the first preset temperature difference threshold for a predetermined period of time, and judging that the temperature difference cannot be stably maintained below the first preset temperature difference threshold when the temperature difference cannot be less than or equal to the first preset temperature difference threshold for a predetermined period of time.

[0145] Figure 8 1 is a flow chart of evaluating whether the temperature difference can be stably maintained below a second preset temperature difference threshold in a control method of an air conditioner outdoor unit according to an embodiment of the present invention. In this embodiment, the step of evaluating whether the temperature difference can be stably maintained below the second preset temperature difference threshold includes:

[0146] Step S802: acquiring the exhaust gas temperature and the external coil temperature multiple times at intervals of a second preset time, and calculating multiple temperature differences.

[0147] Step S804, determining whether the multiple temperature differences are all less than or equal to a second preset temperature difference threshold; if so, executing step S806; if not, executing step S808.

[0148] Step S806, determining whether the temperature difference can be stably maintained below a second preset temperature difference threshold.

[0149] Step S808: determining that the temperature difference cannot be stably maintained below a second preset temperature difference threshold.

[0150] It is understandable that by determining at intervals whether the temperature difference is less than or equal to the second preset temperature difference threshold value for multiple times, it can be determined that the temperature difference can be stably maintained below the second preset temperature difference threshold value. If the results of multiple determinations are all yes, it indicates that the exhaust temperature of the compressor can be continuously stabilized at a relatively low temperature, and it can be determined that the temperature difference can be stably maintained below the second preset temperature difference threshold value. If the result of one determination is no, it indicates that the exhaust temperature of the compressor is not stable enough and may become higher.

[0151] The second preset time length may range from 30 seconds to 2 minutes, such as 30 seconds, 1 minute, 1.5 minutes, 2 minutes, etc. And the second preset time length may preferably be 1 minute, so that the control method of this embodiment can timely evaluate whether the temperature difference is less than or equal to the first preset temperature difference threshold, ensure the energy saving of the air conditioner outdoor unit, and avoid too frequent acquisition of the stability difference. It should be noted that the specific values ​​listed above are only preferred embodiments, and the second preset time length can be specifically set according to actual conditions or experimental data, and it cannot be considered that it can only be set to the values ​​listed above.

[0152] In addition, in some alternative embodiments, the step of evaluating whether the temperature difference can be stably maintained below the second preset temperature difference threshold may include continuously detecting the exhaust temperature and the external coil temperature, calculating the temperature difference between the exhaust temperature and the external coil temperature, and judging whether the temperature difference can be less than or equal to the second preset temperature difference threshold for a predetermined period of time. And the step of evaluating whether the temperature difference can be stably maintained below the second preset temperature difference threshold may also include judging that the temperature difference can be stably maintained below the second preset temperature difference threshold if the temperature difference can be less than or equal to the second preset temperature difference threshold for a predetermined period of time, and judging that the temperature difference cannot be stably maintained below the second preset temperature difference threshold if the temperature difference cannot be less than or equal to the second preset temperature difference threshold for a predetermined period of time.

[0153] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A method for controlling an outdoor unit of an air conditioner, wherein: The air conditioner outdoor unit comprises: chassis; An outdoor unit heat exchange system is arranged in the casing, and the outdoor unit heat exchange system includes a compressor and an outdoor unit heat exchanger arranged at intervals; a compressor cooling fan, disposed on the housing, for causing a compressor cooling airflow to flow through the compressor to dissipate heat therefrom; and The control method comprises: In cooling mode and after the compressor cooling fan is turned on, obtaining the ambient temperature of the space where the air conditioner outdoor unit is located; Determining whether the ambient temperature is greater than a first preset temperature threshold; If yes, obtaining the operating status parameters of the outdoor unit heat exchange system; The speed gear of the compressor cooling fan is set according to the operating status parameters and the ambient temperature.

2. The control method of the air conditioner outdoor unit according to claim 1, wherein: The operating state parameters include the exhaust temperature of the compressor and the external coil temperature of the outdoor unit heat exchanger; as well as, The step of setting the speed gear of the compressor cooling fan according to the operating state parameter and the ambient temperature includes: calculating a temperature difference between the exhaust temperature and the external coil temperature; The speed gear of the compressor cooling fan is set according to the temperature difference and the ambient temperature.

3. The control method of the air conditioner outdoor unit according to claim 2, wherein: The step of setting the speed gear of the compressor cooling fan according to the temperature difference and the ambient temperature comprises: Determining whether the ambient temperature is less than or equal to a second preset temperature threshold; If so, determining whether the temperature difference is less than or equal to a first preset temperature difference threshold; When the temperature difference is less than or equal to a first preset temperature difference threshold, the speed gear of the compressor cooling fan is configured to be a first gear; When the temperature difference is greater than a first preset temperature difference threshold, the speed gear of the compressor cooling fan is configured to be a second gear, wherein the speed of the second gear is higher than the speed of the first gear.

4. The control method of the air conditioner outdoor unit according to claim 3, wherein: When the ambient temperature is greater than the second preset temperature threshold, the step of setting the speed gear of the compressor cooling fan according to the temperature difference and the ambient temperature further includes: Determining whether the temperature difference is less than or equal to a second preset temperature difference threshold; If yes, the speed gear of the compressor cooling fan is configured to be the first gear; If not, the speed gear of the compressor cooling fan is configured to be the third gear, wherein the speed of the third gear is higher than the speed of the second gear.

5. The control method of the air conditioner outdoor unit according to claim 4, wherein: After the step of configuring the speed gear of the compressor cooling fan to the second gear, the control method further includes: Control the cooling fan to operate at the second gear for a first preset time period; Evaluating whether the temperature difference can be stably maintained below a first preset temperature difference threshold; If yes, executing the step of configuring the speed gear of the compressor cooling fan to the first gear; If not, the compressor cooling fan is controlled to operate at the second gear, and the process returns to the step of evaluating whether the temperature difference can be stably maintained below the first preset temperature difference threshold.

6. The control method of the air conditioner outdoor unit according to claim 5, wherein: The step of evaluating whether the temperature difference can be stably maintained below a first preset temperature difference threshold comprises: Acquiring the exhaust gas temperature and the external coil temperature multiple times at intervals of a second preset time, and calculating multiple temperature differences; Determine whether the plurality of temperature differences are all less than or equal to the first preset temperature difference threshold; If so, determining that the temperature difference can be stably maintained below a first preset temperature difference threshold; If not, it is determined that the temperature difference cannot be stably maintained below the first preset temperature difference threshold.

7. The control method of the air conditioner outdoor unit according to claim 4, wherein: After the step of configuring the speed gear of the compressor cooling fan to the third gear, the control method further includes: Control the cooling fan to operate at the third gear for a first preset time; evaluating whether the temperature difference can be stably maintained below a second preset temperature difference threshold; If yes, switch the speed gear of the compressor cooling fan to the second gear; If not, the compressor cooling fan is controlled to operate according to the third gear, and the process returns to the step of evaluating whether the temperature difference can be stably maintained below the second preset temperature difference threshold.

8. The control method of the air conditioner outdoor unit according to claim 7, wherein: The step of evaluating whether the temperature difference can be stably maintained below a second preset temperature difference threshold comprises: Acquiring the exhaust gas temperature and the external coil temperature multiple times at intervals of a second preset time, and calculating multiple temperature differences; Determine whether the plurality of temperature differences are all less than or equal to the second preset temperature difference threshold; If so, determining that the temperature difference can be stably maintained below a second preset temperature difference threshold; If not, it is determined that the temperature difference cannot be stably maintained below the second preset temperature difference threshold.

9. The control method of an air conditioner outdoor unit according to claim 1, wherein: The air conditioner outdoor unit comprises: An ambient temperature sensor, disposed on the housing / adjacent to the housing, for detecting the spatial temperature of the space where the air conditioner outdoor unit is located; The step of obtaining the ambient temperature of the space where the air conditioner outdoor unit is located comprises: Controlling the ambient temperature sensor to detect the temperature of the space; Correcting the deviation of the space temperature caused by the proximity of the ambient temperature sensor to the outdoor unit heat exchanger; The corrected space temperature is determined to be the ambient temperature.

10. An air conditioner outdoor unit, comprising: A controller comprises a memory and a processor, wherein the memory stores a machine executable program, and when the executable program is executed by the processor, the control method for the air conditioner outdoor unit according to any one of claims 1 to 9 is implemented.

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