Air conditioner and compressor frequency control method and device

Abstract

The embodiment of the invention relates to an air conditioner and a compressor frequency control method and device, and the air conditioner comprises a refrigerant circulation loop which comprises a compressor, an outdoor heat exchanger and an indoor heat exchanger; the first temperature sensor is configured to detect the temperature of an outdoor coil pipe corresponding to the outdoor heat exchanger; the controller is configured to obtain a plurality of first outdoor coil pipe temperatures detected by the first temperature sensor in the current detection period; and if the multiple first outdoor coil pipe temperatures are all smaller than the frequency reduction temperature threshold value and all larger than or equal to the frequency limiting temperature threshold value, and the current first operation frequency of the compressor is smaller than the target frequency, the compressor is controlled to increase the operation frequency to the second operation frequency, and the second operation frequency is smaller than or equal to the target frequency. According to the air conditioner and the compressor frequency control method and device, on the premise that it is guaranteed that the temperature of the coil pipe of the outdoor heat exchanger does not exceed the frequency reduction temperature threshold value, the refrigeration output capacity of the air conditioner can be exerted to the maximum extent.

Description

Technical Field

[0001] This application relates to the technical field of household appliances, and particularly to an air conditioner, a method and a device for controlling the frequency of a compressor. Background Art

[0002] In the current field of air conditioners, particular attention is paid to the high-temperature refrigeration capacity of air conditioners. However, during the operation of an air conditioner, in order to protect the compressor from damage due to exceeding the pressure limit value, the air conditioner will set a temperature limit for the outdoor heat exchanger coil to prevent the pressure from exceeding the limit of the compressor when the air conditioner is running, thereby achieving the protection of the compressor. However, this mechanism will sacrifice the refrigeration capacity of the air conditioner at high temperatures and affect the refrigeration efficiency of the air conditioner. Summary of the Invention

[0003] Embodiments of this application disclose an air conditioner, a method and a device for controlling the frequency of a compressor, which can, on the premise of ensuring that the coil temperature of the outdoor heat exchanger does not exceed the frequency reduction temperature threshold, maximize the refrigeration output capacity of the air conditioner, protect the compressor, and improve the refrigeration efficiency of the air conditioner.

[0004] In a first aspect, embodiments of this application disclose an air conditioner, including:

[0005] A refrigerant circulation loop, including a compressor, an outdoor heat exchanger, and an indoor heat exchanger connected in sequence, and the refrigerant circulation loop is configured to circulate the refrigerant;

[0006] A first temperature sensor, configured to detect the outdoor coil temperature corresponding to the outdoor heat exchanger;

[0007] A controller, configured to:

[0008] Obtain a plurality of first outdoor coil temperatures detected by the first temperature sensor during the current detection period;

[0009] If the plurality of first outdoor coil temperatures are all less than the frequency reduction temperature threshold and all greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor is less than the set target frequency, then control the compressor to increase the operating frequency to a second operating frequency, and the second operating frequency is less than or equal to the target frequency; the frequency reduction temperature threshold is used to trigger a reduction in the operating frequency of the compressor when the outdoor coil temperature is greater than or equal to the frequency reduction temperature threshold; the frequency limit temperature threshold is used to trigger the compressor to operate at the target frequency when the outdoor coil temperature is less than the frequency limit temperature threshold.

[0010] In the embodiment of the present application, if in the current detection cycle, multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and all greater than or equal to the frequency limit temperature threshold, it indicates that the compressor is in the frequency limit state, but the first outdoor coil temperature does not trigger the frequency reduction of the compressor. If the current first operating frequency of the compressor is less than the target frequency, it indicates that the operating frequency of the compressor has not reached the desired target frequency. Then the controller can control the compressor to increase the operating frequency to the second operating frequency, increasing the operating frequency of the compressor when it is in the frequency limit state, so as to realize the maximum utilization of the refrigeration output capacity of the air conditioner on the premise of ensuring that the coil temperature of the outdoor heat exchanger does not exceed the frequency reduction temperature threshold, so that in a high-temperature environment, the air conditioner can operate at a higher frequency and provide a stronger refrigeration effect, protecting the compressor and improving the refrigeration efficiency of the air conditioner at the same time.

[0011] As an optional implementation manner, in the first aspect of the embodiment of the present application, the difference between the frequency reduction temperature threshold and the frequency limit temperature threshold is greater than the target difference.

[0012] In the embodiment of this application, the difference between the frequency reduction temperature threshold and the frequency limit temperature threshold of the outdoor coil temperature is greater than the target difference, which can avoid the problem that the outdoor coil temperature fluctuates repeatedly around the frequency reduction temperature threshold and the frequency limit temperature threshold due to the hysteresis of the outdoor coil temperature, thereby preventing the compressor from repeatedly reducing and increasing the frequency, improving the operating stability of the compressor, and also improving the energy efficiency of the air conditioner.

[0013] As an optional implementation manner, in the first aspect of the embodiment of the present application, the controller is further configured to:

[0014] If the multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and all greater than or equal to the frequency limit temperature threshold, and the second outdoor coil temperature is less than the target temperature threshold, and the current first operating frequency of the compressor is less than the set target frequency, then control the compressor to increase the operating frequency to the second operating frequency;

[0015] Wherein, the second outdoor coil temperature is the first outdoor coil temperature detected by the first temperature sensor last in the current detection cycle; the target temperature threshold is less than the frequency reduction temperature threshold.

[0016] In the embodiment of this application, when multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and are all greater than or equal to the frequency limit temperature threshold, and the second outdoor coil temperature is less than the target temperature threshold, and the last detected first outdoor coil temperature in the current detection period is less than the target temperature threshold, the controller controls the compressor to increase the operating frequency to the second operating frequency, which can avoid the fluctuation of the outdoor coil temperature caused by the instantaneous fluctuation of the ambient temperature, make the judgment of the magnitude relationship between the multiple first outdoor coil temperatures and the frequency reduction temperature threshold more accurate, and thus control the frequency of the compressor more accurately.

[0017] As an optional implementation manner, in the first aspect of the embodiment of this application, the target temperature threshold is the frequency reduction temperature threshold minus a preset deviation value.

[0018] In the embodiment of this application, by setting the target temperature threshold to be equal to the frequency reduction temperature threshold minus the preset deviation value, it is possible to avoid the fluctuation of the outdoor coil temperature caused by the influence of the ambient temperature, thereby improving the accuracy of detecting the outdoor coil temperature.

[0019] As an optional implementation manner, in the first aspect of the embodiment of this application, the controller is further configured to:

[0020] Count the first quantity of the first outdoor coil temperatures greater than the frequency reduction temperature threshold among the multiple first outdoor coil temperatures;

[0021] When the first quantity is greater than or equal to the quantity threshold, reduce the target frequency corresponding to the compressor.

[0022] In the embodiment of this application, by reducing the target frequency corresponding to the compressor only when the first quantity of the first outdoor coil temperatures greater than the frequency reduction temperature threshold in the current detection period is greater than or equal to the quantity threshold, rather than immediately reducing the compressor frequency when the first outdoor coil temperature is greater than the frequency reduction temperature threshold, the adjustment of the compressor frequency is made more reasonable, preventing the false triggering of the frequency reduction operation due to individual instantaneous temperature abnormal fluctuations, and being able to avoid the compressor from repeatedly increasing and decreasing the frequency due to short-term temperature exceeding the limit, making the operation of the air conditioner compressor more stable; and, since making the first quantity greater than or equal to the quantity threshold at the current target frequency indicates that the current target frequency is too high and is not conducive to the operation of the compressor, by reducing the target frequency of the compressor, it can be ensured that the operating frequency of the compressor will no longer reach an excessive frequency, and the overload of the compressor caused by the excessive operating frequency of the compressor is avoided from the root, realizing the safety protection of the compressor.

[0023] As an optional implementation manner, in the first aspect of the embodiment of this application, the controller is further configured to:

[0024] If all of the multiple first outdoor coil temperatures are less than the frequency reduction temperature threshold and greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor is less than the set target frequency, then control the compressor to increase the operating frequency to the second operating frequency according to the frequency increase step; and / or,

[0025] When the first quantity is greater than or equal to the quantity threshold, reduce the target frequency corresponding to the compressor according to the frequency decrease step;

[0026] Wherein, the frequency decrease step is greater than or equal to the frequency increase step.

[0027] In the embodiment of this application, increasing the operating frequency of the compressor according to a smaller frequency increase step can avoid the rapid increase in the outdoor coil temperature caused by the too-fast increase in the operating frequency of the compressor, resulting in compressor damage, and can also avoid the compressor quickly triggering frequency reduction after frequency increase, improving the operating stability of the compressor and the energy efficiency of the air conditioner; reducing the target frequency corresponding to the compressor according to a larger frequency decrease step can quickly reduce the outdoor coil temperature and effectively protect the compressor.

[0028] As an alternative implementation manner, in the first aspect of the embodiment of this application, the controller is further configured to:

[0029] After controlling the compressor to increase the operating frequency to the second operating frequency, if in the next detection period, any third outdoor coil temperature detected by the first temperature sensor is greater than the frequency reduction temperature threshold, then control the compressor to reduce the operating frequency to the first operating frequency.

[0030] In the embodiment of this application, in the next detection period after the operating frequency of the compressor increases, if any third outdoor coil temperature is greater than the frequency reduction temperature threshold, it means that the increased operating frequency is not suitable for the current compressor, and there is a risk in continuing to maintain this operating frequency. Therefore, the compressor frequency is timely reduced to prevent the outdoor coil temperature from continuously rising, so as to avoid the outdoor coil temperature being too high, resulting in the pressure of the compressor exceeding the limit, thereby causing compressor damage.

[0031] As an alternative implementation manner, in the first aspect of the embodiment of this application, the air conditioner further includes a second temperature sensor configured to detect the ambient temperature corresponding to the outdoor heat exchanger;

[0032] The controller is further configured to:

[0033] Obtain the ambient temperature detected by the second temperature sensor;

[0034] When the difference obtained by subtracting the frequency reduction temperature threshold from the ambient temperature is greater than the first temperature threshold, or the difference obtained by subtracting the ambient temperature from the frequency limit temperature threshold is greater than the first temperature threshold, temperature compensation is performed on the multiple first outdoor coil temperatures.

[0035] If, in the current detection period, each of the compensated first outdoor coil temperatures is less than the frequency reduction temperature threshold and greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor is less than the target frequency, then control the compressor to increase the operating frequency to the second operating frequency.

[0036] In the embodiment of this application, when the ambient temperature of the outdoor heat exchanger is too high or too low, by performing temperature compensation on the first outdoor coil temperature, the accuracy of the outdoor coil temperature detection is improved, interference caused by ambient temperature changes to the measurement of the first outdoor coil temperature is avoided, the compensated first outdoor coil temperature can more truly reflect the actual temperature of the outdoor coil, frequency misadjustment caused by inaccurate temperature detection is avoided, and the stability of the air conditioner is improved.

[0037] In a second aspect, an embodiment of this application discloses a method for controlling the compressor frequency, which is applied to an air conditioner. The method includes:

[0038] Obtain, through a first temperature sensor, multiple first outdoor coil temperatures corresponding to the outdoor heat exchanger in the current detection period;

[0039] If the multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor of the air conditioner is less than the set target frequency, then increase the operating frequency of the compressor to the second operating frequency, where the second operating frequency is less than or equal to the target frequency; the frequency reduction temperature threshold is used to trigger a reduction in the operating frequency of the compressor when the outdoor coil temperature is greater than or equal to the frequency reduction temperature threshold; the frequency limit temperature threshold is used to trigger the compressor to operate at the target frequency when the outdoor coil temperature is less than the frequency limit temperature threshold.

[0040] In the embodiment of the present application, when the air conditioner detects that multiple first outdoor coil temperatures in the current detection period are less than the frequency reduction temperature threshold and greater than or equal to the frequency limit temperature threshold, it indicates that the compressor is in the frequency limit state but the outdoor coil temperature does not trigger the frequency reduction of the compressor. If the current first operating frequency of the compressor is less than the set target frequency, it means that the operating frequency of the compressor has not reached the desired target frequency. Then, the air conditioner can control the compressor to gradually increase the operating frequency to the second operating frequency, increasing the operating frequency of the compressor while it is in the frequency limit state, so as to maximize the refrigeration output capacity of the air conditioner on the premise of ensuring that the coil temperature of the outdoor heat exchanger does not exceed the frequency reduction temperature threshold, protecting the compressor and enabling the air conditioner to operate at a higher frequency in a high-temperature environment, providing a stronger refrigeration effect, protecting the compressor and improving the refrigeration efficiency of the air conditioner.

[0041] In a third aspect, the embodiment of the present application discloses a control device for the compressor frequency, which is applied to an air conditioner. The device includes:

[0042] A temperature acquisition module, configured to acquire multiple first outdoor coil temperatures corresponding to the outdoor heat exchanger in the current detection period through a first temperature sensor;

[0043] A frequency adjustment module, configured to, if the multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and all greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor of the air conditioner is less than the set target frequency, increase the operating frequency of the compressor to the second operating frequency, where the second operating frequency is less than or equal to the target frequency; the frequency reduction temperature threshold is used to trigger a reduction in the operating frequency of the compressor when the outdoor coil temperature is greater than or equal to the frequency reduction temperature threshold; the frequency limit temperature threshold is used to trigger the compressor to operate at the target frequency when the outdoor coil temperature is less than the frequency limit temperature threshold.

[0044] In the embodiment of the present application, if multiple first outdoor coil temperatures in the current detection period are all less than the frequency reduction temperature threshold and all greater than or equal to the frequency limit temperature threshold, it indicates that the compressor is in the frequency limit state but the outdoor coil temperature does not trigger the frequency reduction of the compressor. If the current first operating frequency of the compressor is less than the set target frequency, it means that the operating frequency has not reached the desired target frequency. Then, the controller can control the compressor to gradually increase the operating frequency to the second operating frequency, increasing the operating frequency of the compressor while it is in the frequency limit state, so as to maximize the refrigeration output capacity of the air conditioner on the premise of ensuring that the coil temperature of the outdoor heat exchanger does not exceed the frequency reduction temperature threshold, protecting the compressor and enabling the air conditioner to operate at a higher frequency in a high-temperature environment, providing a stronger refrigeration effect, protecting the compressor and improving the refrigeration efficiency of the air conditioner. Description of the Drawings

[0045] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for use in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0046] Figure 1 It is a structural block diagram of an air conditioner in an embodiment;

[0047] Figure 2 It is a structural block diagram of an air conditioner in an embodiment;

[0048] Figure 3 It is a control flow chart of a controller in an embodiment;

[0049] Figure 4 It is a control flow chart of a controller in an embodiment;

[0050] Figure 5 It is a control flow chart of a controller in an embodiment;

[0051] Figure 6 It is a control flow chart of a controller in an embodiment;

[0052] Figure 7 It is a structural block diagram of an air conditioner in another embodiment;

[0053] Figure 8 It is a control flow chart of a controller in an embodiment;

[0054] Figure 9 It is a control flow chart of a controller in an embodiment;

[0055] Figure 10 It is a flow chart of a control method for the compressor frequency in an embodiment;

[0056] Figure 11 It is a block diagram of a control device for the compressor frequency in an embodiment. Specific Embodiments

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0058] It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present application and the accompanying drawings are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices.

[0059] It can be understood that the terms "first", "second", etc. used in the present application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of the present application, the first operating frequency can be referred to as the second operating frequency, and similarly, the second operating frequency can be referred to as the first operating frequency. The first operating frequency and the second operating frequency are two different operating frequencies.

[0060] Figure 1 is a structural block diagram of an air conditioner in an embodiment. As Figure 1 shown, the air conditioner 100 may include an outdoor unit 110 and an indoor unit 120. The outdoor unit 110 is usually installed outdoors and is used for heat exchange with the indoor environment. The indoor unit 120 is usually installed indoors and can be in the form of an indoor wall-mounted unit, an indoor cabinet unit, etc. Among them, the indoor unit 120 is connected to the outdoor unit 110 through a gas pipe and a liquid pipe.

[0061] Optionally, the outdoor unit 110 can have various implementation forms. For example, it can be the outdoor unit of a wall-mounted air conditioner, the outdoor unit of a cabinet air conditioner, etc.

[0062] Exemplarily, Figure 2 is a structural block diagram of an air conditioner in an embodiment. As Figure 2 shown, the outdoor unit 110 includes an outdoor heat exchanger 111, a compressor 112, an electronic expansion valve 113, an outdoor fan, and a plurality of outdoor temperature sensors. The outdoor heat exchanger 111 is used for heat exchange with outdoor air; the compressor 112 is used to compress the refrigerant in a low-pressure state into a high-pressure state and drive the refrigerant to circulate in the refrigerant circulation loop 131; the electronic expansion valve 113 is used to adjust the flow rate of the refrigerant in the refrigerant circulation loop 131; the outdoor fan is used to drive the outdoor air to flow and enhance the heat exchange effect of the outdoor heat exchanger 111; the plurality of outdoor temperature sensors may include an outdoor ambient temperature sensor and an outdoor coil temperature sensor (the first temperature sensor 132). The outdoor ambient temperature sensor is used to detect the outdoor ambient temperature, and the outdoor coil temperature sensor is used to detect the coil temperature of the outdoor heat exchanger 111.

[0063] As Figure 2As shown in the figure, the indoor unit 120 includes an indoor heat exchanger 121, an indoor fan, and multiple indoor temperature sensors. Among them, the indoor heat exchanger 121 is used for heat exchange with indoor air; the indoor fan is used to drive the indoor air to flow through the surface of the indoor heat exchanger; the multiple indoor temperature sensors may include an indoor ambient temperature sensor and an indoor coil temperature sensor. The indoor ambient temperature sensor is used to detect the indoor ambient temperature, and the indoor coil temperature sensor is used to detect the coil temperature of the indoor heat exchanger.

[0064] Specifically, as Figure 2 shown in the figure, when the outdoor heat exchanger 111 of the air conditioner 100 cools the indoor environment, the outdoor heat exchanger 111 operates as a condenser and releases heat; the indoor heat exchanger 121 operates as an evaporator and absorbs heat. The refrigerant is compressed by the compressor 112 and becomes a high-temperature and high-pressure gas; it flows into the outdoor heat exchanger 111 to release heat and condenses into a liquid (or gas, or gas-liquid mixture); then it flows into the indoor heat exchanger 121 to absorb heat and evaporates into a gas; finally, it flows back into the compressor 112 to complete a complete refrigerant cycle circuit 131, thereby achieving cooling of the indoor environment.

[0065] In the prior art, in order to protect the compressor of the air conditioner from being damaged due to exceeding the pressure limit value, the frequency reduction temperature threshold and the frequency limit temperature threshold of the outdoor heat exchanger coil temperature are set within the pressure range acceptable to the compressor in the cooling mode. When the temperature of the outdoor heat exchanger coil reaches the frequency reduction temperature threshold, the compressor is controlled to reduce its frequency; when the temperature of the outdoor heat exchanger coil reaches the frequency limit temperature threshold but does not reach the frequency reduction temperature threshold, the increase in the compressor frequency is restricted.

[0066] During the existing high-temperature cooling process of the air conditioner, if the outdoor coil temperature of the outdoor heat exchanger is less than the frequency limit temperature threshold, the operating frequency of the air conditioner compressor is not restricted; if the outdoor coil temperature of the outdoor heat exchanger is greater than or equal to the frequency limit temperature threshold and less than the frequency reduction temperature threshold, the air conditioner cannot increase the compressor frequency; if the outdoor coil temperature of the outdoor heat exchanger is greater than or equal to the frequency reduction temperature threshold, the air conditioner can only reduce the compressor frequency to protect the compressor.

[0067] However, due to the generally high current temperature, the user's demand for the cooling output capacity of the air conditioner is gradually increasing, so that the air conditioner often operates in a high-temperature environment. When the operating frequency of the compressor rises to a relatively high frequency, the outdoor coil temperature often fluctuates near the frequency reduction temperature threshold and the frequency limit temperature threshold. Coupled with the hysteresis in the rise of the temperature of the outdoor heat exchanger coil, the operating frequency of the air conditioner compressor increases and decreases repeatedly with the fluctuation of the outdoor coil temperature.

[0068] Specifically, when the outdoor coil temperature gradually rises above the frequency limit temperature threshold and exceeds the frequency reduction temperature threshold, it is necessary to control the operating frequency of the compressor to decrease, so that the outdoor coil temperature drops. However, there are the following three cases for the outdoor coil temperature after the drop:

[0069] First, if the outdoor coil temperature drops to a value between the frequency reduction temperature threshold and the frequency limit temperature value, the compressor continues to operate.

[0070] Second, if the outdoor coil temperature drops below the frequency limit temperature threshold, causing the operating frequency of the compressor to rise again, and the outdoor coil temperature rises to a value between the frequency limit temperature threshold and the frequency reduction temperature threshold, the compressor continues to operate.

[0071] Third, if the outdoor coil temperature drops below the frequency limit temperature threshold, causing the operating frequency of the compressor to rise again, and the outdoor coil temperature rises above the frequency reduction temperature threshold again, resulting in the need to control the operating frequency of the compressor to drop again, making the operating frequency of the compressor repeatedly rise and fall unstably, then the air outlet temperature of the air conditioner is alternately cold and hot, and its refrigeration output capacity is unstable. At this time, the air conditioner not only has low energy efficiency but also weak refrigeration output capacity.

[0072] The embodiment of the present application discloses an air conditioner, a control method and device for the compressor frequency, which can maximize the refrigeration output capacity of the air conditioner on the premise of ensuring that the coil temperature of the outdoor heat exchanger does not exceed the frequency reduction temperature threshold, protecting the compressor and improving the refrigeration efficiency of the air conditioner.

[0073] As Figure 2 shown, in one embodiment, an air conditioner 100 is provided. The air conditioner 100 includes one or more of the following components: a refrigerant circulation circuit 131, a first temperature sensor 132, and a controller 133.

[0074] The refrigerant circulation circuit 131 is configured to circulate the refrigerant to achieve the refrigeration or heating function of the air conditioner.

[0075] Optionally, as Figure 2 shown, the refrigerant circulation circuit 131 may include a compressor 112, an outdoor heat exchanger 111, and an indoor heat exchanger 121 connected in sequence.

[0076] The first temperature sensor 132 is configured to detect the outdoor coil temperature corresponding to the outdoor heat exchanger 111.

[0077] It should be noted that the first temperature sensor 132 is equivalent to the outdoor coil temperature sensor in the outdoor temperature sensor.

[0078] Optionally, the first temperature sensor 132 may adopt a temperature sensor such as a thermistor type or a thermocouple type with high precision, fast response, and long-term stability, which can accurately measure the temperature value of the outdoor coil.

[0079] In some embodiments, the first temperature sensor 132 may be installed at a position close to the coil surface of the outdoor heat exchanger 111 to directly sense the temperature change of the coil.

[0080] Optionally, the first temperature sensor 132 may be configured to detect the outdoor coil temperature corresponding to the outdoor heat exchanger 111 according to a preset temperature detection period. For example, the first temperature sensor 132 may perform a temperature detection on the coil of the outdoor heat exchanger 111 once per minute, every few minutes, or at longer intervals. By periodically detecting the outdoor coil temperature, continuous change data of the outdoor coil temperature can be obtained, thereby avoiding the detection of instantaneous temperature and more accurately controlling the operating frequency of the compressor.

[0081] Optionally, the preset temperature detection period may be a fixed value or may be determined according to the outdoor coil temperature and / or the outdoor ambient temperature.

[0082] Exemplarily, the first temperature sensor 132 may be configured to detect the outdoor coil temperature corresponding to the outdoor heat exchanger 111 according to a first temperature detection period when the outdoor coil temperature is greater than a first detection temperature threshold and / or the outdoor ambient temperature is greater than a second detection threshold.

[0083] The first temperature sensor 132 may also be configured to detect the outdoor coil temperature corresponding to the outdoor heat exchanger 111 according to a second temperature detection period when the outdoor coil temperature is less than or equal to the first detection temperature threshold and / or the outdoor ambient temperature is less than or equal to the second detection threshold, and the first temperature detection period is less than the second temperature detection period.

[0084] The first detection threshold can reflect the heat exchange efficiency on the refrigerant side of the outdoor heat exchanger. Whether the second detection threshold can reflect the intensity of the external heat load. When the outdoor coil temperature is less than or equal to the first detection temperature threshold and / or the outdoor ambient temperature is less than or equal to the second detection threshold, it means that the outdoor coil temperature and / or the outdoor ambient temperature is relatively low, and the distance from the frequency limit temperature threshold or the frequency reduction temperature threshold is relatively far, and the probability of needing to perform frequency reduction control on the compressor is relatively small. Then, the detection period of the first temperature sensor 132 for detecting the coil temperature can be relatively small. This can reduce the energy consumption caused by unnecessary temperature detection.

[0085] For example, when the outdoor coil temperature is greater than or equal to 40 °C, the first temperature sensor detects the outdoor coil temperature corresponding to the outdoor heat exchanger once every 5 seconds; when the outdoor coil temperature is less than 40 °C, the first temperature sensor detects the outdoor coil temperature corresponding to the outdoor heat exchanger once every 10 seconds.

[0086] Specifically, the smaller the difference between the outdoor coil temperature and the frequency limit temperature threshold, the shorter the temperature detection period of the first temperature sensor can be.

[0087] As Figure 3 shown, the controller 133 is configured to perform the following steps:

[0088] Step 310, obtain multiple first outdoor coil temperatures detected by the first temperature sensor during the current detection period.

[0089] The detection period can be preset. The detection period can refer to the period for detecting whether the operating frequency of the compressor 112 needs to be adjusted. The duration of the detection period can be set according to actual needs, such as 5 minutes, 7 minutes, 10 minutes, 4 minutes, etc., but not limited thereto.

[0090] The controller 133 can obtain multiple first outdoor coil temperatures detected by the first temperature sensor during the current detection period, and determine whether to adjust the operating frequency of the compressor 112 according to the multiple first outdoor coil temperatures.

[0091] Furthermore, the controller 133 can compare the multiple first outdoor coil temperatures with the frequency reduction temperature threshold and the frequency limit temperature threshold respectively, determine whether each first outdoor coil temperature is less than the frequency reduction temperature threshold, and / or determine whether each first outdoor coil temperature is greater than or equal to the frequency limit temperature threshold, and determine whether to adjust the operating frequency of the compressor 112 according to the determination result.

[0092] Optionally, the frequency reduction temperature threshold and the frequency limit temperature threshold can be determined by the pressure range acceptable to the compressor 112. The frequency reduction temperature threshold is used to detect whether to reduce the operating frequency of the compressor 112, and the frequency limit temperature threshold is used to detect whether to limit the operating frequency of the compressor 112. It should be noted that the frequency reduction temperature threshold and the frequency limit temperature threshold are two different temperature thresholds, and their definitions are mainly related to the setting of temperature thresholds in related technologies. It does not mean that in the embodiments of the present application, when it is greater than or equal to the frequency limit temperature threshold, the operating frequency of the compressor 112 will definitely be limited. How to adjust the operating frequency of the compressor 112 is determined according to the corresponding adjustment strategy.

[0093] Step 320, if all the first outdoor coil temperatures are less than the frequency reduction temperature threshold and greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor is less than the set target frequency, then control the compressor to increase the operating frequency to the second operating frequency, and the second operating frequency is less than or equal to the target frequency.

[0094] Wherein, the current first operating frequency of the compressor 112 refers to the operating frequency of the compressor 112 at the end of the current detection period; the frequency reduction temperature threshold is used to trigger a reduction in the operating frequency of the compressor when the outdoor coil temperature is greater than or equal to the frequency reduction temperature threshold; the frequency limit temperature threshold is used to trigger the compressor to operate at the set target frequency when the outdoor coil temperature is less than the frequency limit temperature threshold.

[0095] By setting the detection period, the operating frequency adjustment of the compressor 112 is made periodic. That is, at the end of the current detection period, in combination with multiple first outdoor coil temperatures detected during the current detection period and the first operating frequency of the compressor 112 at the end of the current detection period, it can be determined whether to adjust the operating frequency of the compressor 112, which can reduce the number of switching times of the operating frequency, ensure that the operating frequency is switched only once within a detection period, and will not be switched multiple times in a short time due to instantaneous temperature changes, thus ensuring the stable operation of the compressor 112.

[0096] In some embodiments, if the controller 133 detects that during the current detection period, all the first outdoor coil temperatures collected by the first temperature sensor are less than the frequency reduction temperature threshold and all the first outdoor coil temperatures are greater than or equal to the frequency limit temperature threshold, it indicates that although the compressor 112 is in a theoretically frequency-limited state and the outdoor coil temperature is at a relatively high level, it is still within the safe and controllable range and has not reached the limit that requires immediate frequency reduction, and the compressor 112 still has the potential for limited frequency increase. The controller 133 can further determine whether the current first operating frequency of the compressor 112 is less than the set target frequency. If the current first operating frequency of the compressor 112 is less than the set target frequency, it means that the compressor 112 is not currently operating at the desired operating frequency and has not fully exerted its ability to meet the refrigeration demand, and there is still room for the compressor 112 to increase the frequency to enhance the refrigeration effect. Then the controller 133 can control the compressor 112 to increase the operating frequency to the second operating frequency, so that the increased operating frequency is closer to the set target operating frequency, thereby further exerting the refrigeration capacity of the compressor 112.

[0097] The current first operating frequency of the compressor 112 being less than the set target frequency indicates that the compressor 112 is not currently operating at the desired operating efficiency, which means that the air conditioner 100 has not fully exerted its refrigeration capacity, and there is still room for the operating frequency of the compressor 112 to increase.

[0098] Therefore, when all the first outdoor coil temperatures detected by the first temperature sensor 132 are less than the frequency reduction temperature threshold and greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor 112 is less than the target frequency, the controller 133 can gradually increase the operating frequency of the compressor within the safety boundary to gradually compress and enhance the refrigeration output capacity of the air conditioner 100.

[0099] Since the target frequency is the preset theoretical safety upper limit of the air conditioner compressor 112. If the operating frequency of the compressor exceeds the target frequency, it may cause the compressor to be overloaded and trigger a protection shutdown; or, it may cause the refrigerant pressure to exceed the limit, posing a risk of pipeline leakage or bursting. Therefore, it is necessary to ensure that the increased second operating frequency of the compressor 112 is less than or equal to the target frequency.

[0100] Optionally, the target frequency can be determined based on the limit parameters of the compressor, outdoor heat exchanger, and refrigerant cycle (such as the maximum speed of the compressor, refrigerant pressure limit value, etc.).

[0101] In some embodiments, the controller 133 can be configured to: in chronological order, in the current detection period, when it detects that the outdoor coil temperature detected by the first temperature sensor 132 changes, record the changed outdoor coil temperature to obtain multiple first outdoor coil temperatures in the current detection period.

[0102] Exemplarily, the controller 133 can be configured to: record the temperature of 30°C detected by the first temperature sensor 132 at the start moment of the current detection period as the first outdoor coil temperature; in the current detection period, the temperature detected by the first temperature sensor 132 changes three times, and the changed temperatures are 32°C, 31°C, and 30°C respectively. Then the multiple first outdoor coil temperatures in the current detection period are 30°C, 31°C, and 32°C respectively. By recording the changing outdoor coil temperature, it can help the controller 133 capture abnormal fluctuations of the outdoor coil temperature more sensitively and reduce resource waste of the controller 133.

[0103] In some embodiments, the controller 133 is further configured to: if multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and all greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor is less than the set target frequency, then control the compressor to increase the operating frequency to the second operating frequency according to the frequency increase step size.

[0104] Exemplarily, the frequency increase step size can be set to 2 - 3 Hz.

[0105] In some embodiments, the difference between the frequency reduction temperature threshold and the frequency limit temperature threshold is greater than the target difference.

[0106] In the prior art, the difference between the frequency reduction temperature threshold and the frequency limit temperature threshold is set too small (for example, between 1°C and 2°C). When the air conditioner 100 operates in a high-temperature environment, the outdoor coil temperature detected by the first temperature sensor fluctuates repeatedly, touching the frequency reduction temperature threshold and the frequency limit temperature threshold repeatedly. When the operating frequency of the compressor is prone to frequent switching, it will not only cause additional energy loss, but also lead to fluctuations in the air outlet temperature of the air conditioner, affecting the user experience. Therefore, the difference between the frequency reduction temperature threshold and the frequency limit temperature threshold should not be too small.

[0107] In some embodiments, the target difference can be determined according to the time when the temperature change lags behind the frequency adjustment, the material of the outdoor heat exchanger, the refrigerant heat capacity of the air conditioner, the air volume, and the rising speed of the outdoor coil temperature under high-temperature conditions. For example, the difference between the frequency reduction temperature threshold and the frequency limit temperature threshold can be any value between 3°C and 4°C.

[0108] In some embodiments, the controller 133 can also be configured to: if, in the current detection period, among the multiple outdoor coil temperatures detected by the first temperature sensor 132, there is an outdoor coil temperature not within the range of the frequency reduction temperature threshold and the frequency limit temperature threshold, and / or the current first operating frequency of the compressor 112 is greater than or equal to the target frequency, then control the compressor 112 to operate at the current first operating frequency or reduce the operating frequency.

[0109] In some embodiments, if the controller 133 detects that in the current detection period, there is one or more first outdoor coil temperatures greater than or equal to the frequency reduction temperature threshold, it means that the temperature of the outdoor coil has exceeded the limit level, has exceeded the safe and controllable range, and has reached the limit that requires immediate frequency reduction. If the compressor 112 continues to operate, it may cause adverse consequences such as burning of the outdoor coil. Therefore, the compressor 112 can be controlled to reduce the operating frequency.

[0110] Furthermore, a quantity threshold for triggering the compressor 112 to reduce the operating frequency can be set. If, in the current detection period, there are N first outdoor coil temperatures greater than or equal to the frequency reduction temperature threshold, and N is greater than the quantity threshold, then the compressor 112 can be controlled to reduce the operating frequency. This can avoid frequent frequency reduction of the compressor caused by individual first outdoor coil temperatures occasionally and briefly reaching the frequency reduction temperature threshold, making the adjustment of the compressor operating frequency more reasonable and stable, reducing unnecessary operations while ensuring refrigeration stability and energy efficiency.

[0111] In some embodiments, if the controller 133 detects that in the current detection period, all the first outdoor coil temperatures collected by the first temperature sensor are less than the frequency reduction temperature threshold, and there is one or more first outdoor coil temperatures less than the frequency limit temperature threshold, it indicates that the temperature of the outdoor coil is relatively low, the compressor 112 has not reached the frequency limit state yet, and there is still a relatively safe frequency change space. Therefore, the operating frequency of the compressor 112 can be not restricted, and the compressor 112 can be controlled to operate at the set target frequency.

[0112] Among them, the target frequency refers to the expected operating frequency corresponding to the compressor. The target frequency can be set according to the target operating parameters set by the air conditioner (such as the target temperature and / or target humidity, etc.). Exemplarily, the target operating parameters can be set by the user's operation. For example, the user can set the target temperature (i.e., the expected indoor temperature) that the user expects when the air conditioner operates.

[0113] In the embodiments of the present application, when the temperature of the outdoor coil is in a relatively appropriate range, the controller 133 does not need to frequently adjust the operating frequency of the compressor 112 to cope with excessive load or low energy efficiency. Controlling the compressor 112 to operate at the set target frequency can enable the air conditioning system to continuously work under stable and efficient working conditions, bringing a stable cooling effect.

[0114] In the embodiments of the present application, if in the current detection period, multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and are all greater than or equal to the frequency limit temperature threshold, it indicates that the compressor 112 is in the frequency limit state but the first outdoor coil temperature does not trigger the frequency reduction of the compressor 112. If the current first operating frequency of the compressor 112 is less than the set target frequency, it indicates that the operating frequency of the compressor 112 has not reached the expected target frequency. Then the controller 133 can control the compressor 112 to increase the operating frequency to the second operating frequency. Increasing the operating frequency of the compressor when the compressor 112 is in the frequency limit state can thus maximize the cooling output capacity of the air conditioner 100 on the premise that the coil temperature of the outdoor heat exchanger 111 will not exceed the frequency reduction temperature threshold, protecting the compressor 112 and improving the cooling efficiency of the air conditioner 100.

[0115] As Figure 4 shown, in some embodiments, the controller 133 is further configured to perform the following steps:

[0116] Step 402, obtain multiple first outdoor coil temperatures detected by the first temperature sensor in the current detection period, the first operating frequency of the compressor in the current detection period, and the second outdoor coil temperature detected by the first temperature sensor last.

[0117] Step 404: If multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and all greater than or equal to the frequency limit temperature threshold, and the second outdoor coil temperature is less than the target temperature threshold, and the current first operating frequency of the compressor is less than the set target frequency, then control the compressor to increase the operating frequency to the second operating frequency.

[0118] Among them, the second outdoor coil temperature is the first outdoor coil temperature finally detected by the first temperature sensor 132 in the current detection period; the target temperature threshold is less than the frequency reduction temperature threshold.

[0119] The second outdoor coil temperature being less than the target temperature threshold indicates that in the current detection period, the last detected second outdoor coil temperature of the outdoor coil temperature is within the safe and controllable range, and the target temperature threshold is less than the frequency reduction temperature threshold, which can reserve a safe space for the temperature fluctuation after frequency increase and avoid the outdoor coil temperature exceeding the frequency reduction temperature threshold due to thermal inertia or sudden change of ambient temperature.

[0120] Optionally, the target temperature threshold is the frequency reduction temperature threshold minus a preset deviation value. By setting the target temperature threshold equal to the frequency reduction temperature threshold minus the preset deviation value, the air conditioner can make a judgment more quickly and accurately, thereby improving the control efficiency of the compressor frequency.

[0121] For example, the target temperature threshold can be set to the frequency reduction temperature threshold minus 1.

[0122] In some embodiments, the controller 133 is configured to: if, in the current detection period, among the multiple first outdoor coil temperatures detected by the first temperature sensor 132, there is a first outdoor coil temperature not within the range of the frequency reduction temperature threshold and the frequency limit temperature threshold, and / or the current first operating frequency of the compressor 112 is greater than or equal to the target frequency, and / or the second outdoor coil temperature is greater than or equal to the target temperature threshold, then control the compressor 112 to operate at the current first operating frequency or reduce the operating frequency.

[0123] In the embodiments of the present application, in the current detection period, when multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and all greater than or equal to the frequency limit temperature threshold, and the second outdoor coil temperature is less than the target temperature threshold, and the last detected first outdoor coil temperature in the current detection period is less than the target temperature threshold, the controller 133 controls the compressor 112 to increase the operating frequency to the second operating frequency, which can avoid the temperature fluctuation of the outdoor coil caused by the instantaneous fluctuation of the ambient temperature, make the judgment of the size relationship between the outdoor coil temperature and the frequency reduction temperature threshold more accurate, and thus control the frequency of the compressor 112 more accurately.

[0124] As Figure 5 shown, in some embodiments, the controller 133 is further configured to perform the following steps:

[0125] Step 502: Obtain multiple first outdoor coil temperatures detected by the first temperature sensor during the current detection cycle.

[0126] Step 504: Count the first quantity of the first outdoor coil temperatures greater than the frequency reduction temperature threshold among the multiple first outdoor coil temperatures.

[0127] The first quantity of the first outdoor coil temperatures greater than the frequency reduction temperature threshold can represent the compressor load state and the heat dissipation efficiency of the air conditioner.

[0128] Optionally, when the first quantity is large in the current detection cycle, it indicates that the temperature of the outdoor coil exceeds the frequency reduction temperature threshold during multiple detections by the first temperature sensor 132, indicating that the air conditioner 100 is currently in a high load state and may need to reduce the compressor frequency to reduce the load. When the first quantity is small in the current detection cycle, it indicates that the temperature of the outdoor coil is within the safe range for most of the current detection cycle, and the load on the compressor of the air conditioner 100 is low. The current operating frequency of the compressor can be maintained or appropriately increased to increase the cooling capacity.

[0129] Optionally, when the first quantity is large in the current detection cycle, it can also indicate insufficient heat dissipation efficiency of the outdoor heat exchanger 111, resulting in a continuously high temperature of the outdoor coil. When the first quantity is too large, it will cause the coil of the outdoor heat exchanger 111 to burn out. When the first quantity is small in the current detection cycle, it can also indicate that the heat dissipation efficiency of the outdoor heat exchanger 111 is normal, and the current operating frequency of the compressor can be maintained.

[0130] By counting the first quantity of the first outdoor coil temperatures greater than the frequency reduction temperature threshold in the current detection cycle, the influence of the instantaneous environment on the temperature of the outdoor coil at a single moment can be avoided, and the load condition and heat dissipation efficiency of the air conditioner 100 during the current detection cycle can be evaluated, so as to more reasonably and accurately adjust the operating frequency of the compressor 112 and reduce randomness.

[0131] Step 506: Determine whether the first quantity is greater than or equal to the quantity threshold; if so, execute Step 508; if not, execute Step 510.

[0132] Step 508: Reduce the target frequency corresponding to the compressor.

[0133] The first quantity is greater than or equal to the quantity threshold, indicating that the temperature of the outdoor coil has exceeded the frequency reduction temperature threshold in multiple detections. The compressor 112 may be in a high-load state or have insufficient heat dissipation efficiency, and the compressor may have reached the limit of operation. If the current operating frequency is continued to be maintained, it may cause the temperature of the outdoor coil to further increase, resulting in damage to the outdoor heat exchanger 111. Therefore, it is necessary to reduce the target frequency corresponding to the compressor to lower the temperature of the outdoor coil.

[0134] In some embodiments, the controller 133 is further configured to: when the first quantity is greater than or equal to the quantity threshold, reduce the target frequency corresponding to the compressor according to the frequency reduction step size; wherein, the frequency reduction step size is greater than or equal to the frequency increase step size.

[0135] It should be noted that the size of the frequency reduction step size will affect the control of the operating frequency by the controller 133 and the temperature change speed of the coil of the outdoor heat exchanger 111. If the frequency reduction step size is too large, it may cause the operating frequency of the compressor to change too violently; if the operating frequency is too small, it may cause the outdoor ambient temperature to change slowly, resulting in damage to the compressor 112 or the outdoor heat exchanger 111.

[0136] Optionally, the frequency reduction step size can be determined according to the refrigeration capacity of the air conditioner. Exemplarily, the frequency reduction step size can be set to 3 to 5 Hz.

[0137] Due to the hysteresis in the temperature change of the outdoor coil (for example, it takes 3 to 5 minutes for the adjustment of the operating frequency of the compressor to be reflected in the temperature of the outdoor coil). When the first outdoor coil temperature detected in the current detection cycle exceeds the frequency reduction temperature threshold multiple times, a larger frequency reduction step size can quickly reduce the operating frequency of the compressor, rapidly reduce the heat output, shorten the temperature drop time of the outdoor coil, and avoid the continuous rise of the temperature of the outdoor coil due to response delay, thereby protecting the outdoor heat exchanger 111 and the compressor 112 from damage caused by high temperature.

[0138] Step 510, control the compressor to operate at the current operating frequency.

[0139] Specifically, the controller 133 is configured to: when the first quantity is less than the quantity threshold, control the compressor 112 to operate at the current operating frequency.

[0140] The first quantity is less than the quantity threshold, indicating that the temperature of the outdoor coil is within a safe or controllable range, and the compressor 112 does not need to adjust the frequency and can maintain the current operating frequency.

[0141] In the embodiments of the present application, the target frequency corresponding to the compressor is only reduced when the first number of the first outdoor coil temperatures greater than the frequency reduction temperature threshold in the current detection period is greater than or equal to the number threshold, rather than immediately reducing the compressor frequency when the first outdoor coil temperature is greater than the frequency reduction temperature threshold. This makes the adjustment of the compressor frequency more cautious and reasonable, prevents false triggering of the frequency reduction operation due to individual instantaneous temperature abnormal fluctuations, and can avoid the compressor 112 from repeatedly increasing and decreasing the frequency due to short-term temperature exceeding the limit, making the operation of the air conditioner compressor 112 more stable. Moreover, since the first number is greater than or equal to the number threshold at the current target frequency, it indicates that the current target frequency is too high and is not conducive to the operation of the compressor. By reducing the target frequency of the compressor 112, it can be ensured that the operating frequency of the compressor 112 will no longer reach an excessively high frequency, avoiding compressor overload caused by the excessively high operating frequency of the compressor 112 from the root cause and realizing the safety protection of the compressor 112.

[0142] As Figure 6 shown, in some embodiments, the controller 133 is further configured to perform the following steps:

[0143] Step 602, after controlling the compressor to increase the operating frequency to the second operating frequency, continuously obtain any third outdoor coil temperature detected by the first temperature sensor in the next detection period.

[0144] Step 604, determine whether any third outdoor coil temperature detected by the first temperature sensor in the next detection period is greater than the frequency reduction temperature threshold; if so, perform Step 606; if not, perform Step 608.

[0145] Step 606, control the compressor to reduce the operating frequency to the first operating frequency.

[0146] If any third outdoor coil temperature detected by the first temperature sensor 132 in the next detection period is greater than the frequency reduction temperature threshold, control the compressor 112 to reduce the operating frequency to the first operating frequency.

[0147] In the next detection period after the operating frequency of the compressor increases, if any third outdoor coil temperature is greater than the frequency reduction temperature threshold, it means that the increased operating frequency is not suitable for the current compressor, and there is a risk in continuing to maintain this operating frequency. Therefore, the compressor frequency is timely reduced to prevent the temperature of the outdoor coil from continuously rising, thus avoiding damage to the air conditioner due to excessive temperature.

[0148] Step 608, control the compressor 112 to operate at the second operating frequency.

[0149] If any third outdoor coil temperature detected by the first temperature sensor 132 in the next detection period is less than or equal to the frequency reduction temperature threshold, control the compressor to operate at the second operating frequency.

[0150] In an embodiment of the present application, in the next detection cycle after the operating frequency of the compressor increases, if any of the third outdoor coil temperatures is greater than the frequency reduction temperature threshold, it means that the increased operating frequency is not suitable for the current compressor, and there is a risk in continuing to maintain the operation at this operating frequency. Therefore, the compressor frequency is timely reduced to prevent the temperature of the outdoor coil from continuously rising, so as to avoid the temperature of the outdoor coil being too high, which may cause the pressure of the compressor to exceed the limit and result in compressor damage.

[0151] Figure 7 It is a structural block diagram of an air conditioner in an embodiment. As Figure 7 shown, in an embodiment, an air conditioner 100 is provided, and the air conditioner 100 includes one or more of the following components: a refrigerant circulation circuit 131, a first temperature sensor 132, a controller 133, and a second temperature sensor 134.

[0152] The second temperature sensor 134 is configured to detect the ambient temperature corresponding to the outdoor heat exchanger 111.

[0153] It should be noted that the second temperature sensor 134 is equivalent to the outdoor ambient temperature sensor in the outdoor temperature sensor.

[0154] As Figure 8 shown, in some embodiments, the controller 133 is configured to perform the following steps:

[0155] Step 802, obtain the ambient temperature detected by the second temperature sensor.

[0156] Step 804, perform temperature compensation on multiple first outdoor coil temperatures when the difference obtained by subtracting the frequency reduction temperature threshold from the ambient temperature is greater than the first temperature threshold, or when the difference obtained by subtracting the ambient temperature from the frequency limit temperature threshold is greater than the first temperature threshold.

[0157] When the difference obtained by subtracting the frequency reduction temperature threshold from the ambient temperature is greater than the first temperature threshold, or when the difference obtained by subtracting the ambient temperature from the frequency limit temperature threshold is greater than the first temperature threshold, it means that the ambient temperature has become too high or too low, and it may affect the accuracy of the temperature detection of the outdoor coil due to the heat transfer effect. Therefore, it is necessary to perform temperature compensation on multiple first outdoor coil temperatures detected by the first temperature sensor 132.

[0158] In some embodiments, when the difference obtained by subtracting the frequency reduction temperature threshold from the ambient temperature is greater than the first temperature threshold, it means that the ambient temperature is much higher than the frequency reduction temperature threshold, and the outdoor environment is overheated, which may cause the detected value of the outdoor coil temperature to be too high, thus affecting the relationship judgment between the first outdoor coil temperature and the frequency reduction temperature threshold.

[0159] In some embodiments, when the difference obtained by subtracting the ambient temperature from the frequency-limiting temperature threshold is greater than the first temperature threshold, it means that the ambient temperature is much lower than the frequency-limiting temperature threshold, and the outdoor environment is too cold, which may cause the detected value of the temperature of the outdoor coil to be too low, thus affecting the judgment of the relationship between the first outdoor coil temperature and the frequency reduction temperature threshold.

[0160] Optionally, the compensation amplitude for compensating each first outdoor coil temperature can be a fixed value, or can vary linearly or non-linearly.

[0161] Exemplarily, when the difference obtained by subtracting the frequency reduction temperature threshold from the ambient temperature is greater than the first temperature threshold, each first outdoor coil temperature detected by the first temperature sensor 132 can be reduced according to the first compensation amplitude. Specifically, the greater the difference obtained by subtracting the frequency reduction temperature threshold from the ambient temperature, the greater the first compensation amplitude.

[0162] When the difference obtained by subtracting the ambient temperature from the frequency-limiting temperature threshold is greater than the first temperature threshold, each first outdoor coil temperature can be increased according to the second compensation amplitude. Specifically, the greater the difference obtained by subtracting the ambient temperature from the frequency-limiting temperature threshold, the greater the second compensation amplitude.

[0163] Optionally, the controller 133 is further configured to: if in the current detection period, each compensated first outdoor coil temperature is less than the frequency reduction temperature threshold and greater than or equal to the frequency-limiting temperature threshold, and the current first operating frequency of the compressor is less than the target frequency, then control the compressor to increase the operating frequency to the second operating frequency.

[0164] Specifically, the controller 133 is further configured to: when the difference obtained by subtracting the frequency reduction temperature threshold from the ambient temperature is less than or equal to the first temperature threshold, or the difference obtained by subtracting the ambient temperature from the frequency-limiting temperature threshold is less than or equal to the first temperature threshold, there is no need to compensate the temperature of each first outdoor coil detected by the first temperature sensor 132.

[0165] The difference obtained by subtracting the frequency reduction temperature threshold from the ambient temperature is less than or equal to the first temperature threshold, or the difference obtained by subtracting the ambient temperature from the frequency-limiting temperature threshold is less than or equal to the first temperature threshold, both can indicate that the current ambient temperature is close to the frequency reduction temperature threshold or the frequency-limiting temperature threshold, which is not enough to affect the detection and judgment of the temperature of the outdoor coil, so there is no need to perform temperature compensation processing on each first outdoor coil temperature.

[0166] In the embodiments of the present application, when the ambient temperature of the outdoor heat exchanger is too high or too low, the first outdoor coil temperature detected by the first temperature sensor is temperature-compensated to improve the accuracy of the temperature detection of the outdoor coil, avoid the interference of ambient temperature changes on the temperature measurement of the outdoor coil, make the compensated first outdoor coil temperature more truly reflect the actual temperature of the outdoor coil, avoid the frequency misadjustment caused by inaccurate temperature detection, and improve the stability of the air conditioner.

[0167] As Figure 9 shown, in a specific embodiment, with b minutes as a detection period, the first quantity is a, the quantity threshold is 3, the frequency reduction temperature threshold is T1, the frequency limit temperature threshold is T2, T1 - T2 = 5°C, the first operating frequency is Ni, the second operating frequency is N(i + 1), the initial target frequency is N0, and N0 ≥ N(i + 1) > Ni, the frequency reduction step size is c, the frequency increase step size is d, and c > d, the second outdoor coil temperature is T3, and the target temperature threshold is T1 - 1.

[0168] Specifically, the controller 133 is configured to execute the following steps 902 to step 922.

[0169] Obtain each first outdoor coil temperature detected by the first temperature sensor 132; and count the first quantity a of the first outdoor coil temperatures greater than the frequency reduction temperature threshold T1 among the first outdoor coil temperatures detected by the first temperature sensor 132 in the b minutes of the current detection period; control the adjustment of the operating frequency of the compressor 112 according to the relationship between the first quantity a and the quantity threshold 3 to realize the refrigeration of the air conditioner.

[0170] When a > 3, reduce the target frequency corresponding to the compressor 112 so that the reduced target frequency N0' = N0 - c. When a ≤ 3, keep the target frequency N0 unchanged and enter the b minutes of the next detection period to re-obtain each first outdoor coil temperature detected by the first temperature sensor 132.

[0171] Specifically, the controller 133 obtains each first outdoor coil temperature detected by the first temperature sensor 132; and controls the adjustment of the operating frequency of the compressor 112 according to the relationship between each first outdoor coil temperature detected by the first temperature sensor 132 and the frequency reduction temperature threshold T1 and the frequency limit temperature threshold T2 in the b minutes of the current detection period, the relationship between the last detected first outdoor coil temperature T3 of the first temperature sensor 132 and the target temperature threshold T1 - 1, and the relationship between the current first operating frequency Ni of the compressor 112 and the target frequency N0 to realize the refrigeration of the air conditioner.

[0172] If, within b minutes of the current detection cycle, each first outdoor coil temperature ≥ T2 and < T1, and T3 < T1 - 1, and Ni < N0, then increase the operating frequency of the compressor 112 to N(i + 1) = Ni + d. If, within b minutes of the current detection cycle, the temperature of each first outdoor coil is < T2 or ≥ T1, and / or, T3 ≥ T1 - 1, and / or, Ni ≥ N0, then do not adjust the operating frequency of the compressor 112, and enter the b minutes of the next detection cycle to re-acquire the temperatures of each first outdoor coil detected by the first temperature sensor 132.

[0173] Specifically, the controller 133 is configured to perform the following steps: within b minutes of the next detection cycle after increasing the operating frequency of the compressor 112 to N(i + 1), acquire the temperature of the third outdoor coil detected by the first temperature sensor 132. If the temperature of the third outdoor coil ≥ T1, immediately decrease the operating frequency of the compressor 112, N(i + 1) = Ni - d.

[0174] In the embodiment of the present application, when the compressor is in the frequency limit state, but the temperatures of each first outdoor coil do not trigger the frequency reduction of the compressor, and the operating frequency of the compressor has not reached the desired target frequency, the controller can control the compressor to increase the operating frequency to the second operating frequency, increasing the operating frequency of the compressor in the frequency limit state, so as to maximize the refrigeration output capacity of the air conditioner on the premise of ensuring that the coil temperature of the outdoor heat exchanger does not exceed the frequency reduction temperature threshold. In a high-temperature environment, the air conditioner can operate at a higher frequency to provide a stronger refrigeration effect, protecting the compressor and improving the refrigeration efficiency of the air conditioner. It can also avoid the problem that the temperature of the outdoor coil fluctuates repeatedly around the frequency reduction temperature threshold and the frequency limit temperature threshold due to the hysteresis of the temperature of the outdoor coil, thereby preventing the compressor from repeatedly reducing and increasing the frequency, improving the operating stability of the compressor, and also improving the energy efficiency of the air conditioner.

[0175] As Figure 10 shown, in one embodiment, a method for controlling the compressor frequency is provided, which can be applied to the above-mentioned air conditioner 100. The method may include the following steps 1010 to step 1020.

[0176] Step 1010, acquire, through the first temperature sensor, the temperatures of multiple first outdoor coils corresponding to the outdoor heat exchanger within the current detection cycle.

[0177] Step 1020: If multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and all greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor of the air conditioner is less than the set target frequency, then increase the operating frequency of the compressor to the second operating frequency, where the second operating frequency is less than or equal to the target frequency; the frequency reduction temperature threshold is used to trigger a reduction in the operating frequency of the compressor when the outdoor coil temperature is greater than or equal to the frequency reduction temperature threshold; the frequency limit temperature threshold is used to trigger the compressor to operate at the target frequency when the outdoor coil temperature is less than the frequency limit temperature threshold.

[0178] Optionally, the difference between the frequency reduction temperature threshold and the frequency limit temperature threshold is greater than the target difference.

[0179] In some embodiments, the step of increasing the operating frequency of the compressor to the second operating frequency if multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and all greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor of the air conditioner is less than the set target frequency includes: If multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and all greater than or equal to the frequency limit temperature threshold, and the second outdoor coil temperature is less than the target temperature threshold, and the current first operating frequency of the compressor is less than the set target frequency, then control the compressor to increase the operating frequency to the second operating frequency; where the second outdoor coil temperature is the first outdoor coil temperature detected last by the first temperature sensor in the current detection period; the target temperature threshold is less than the frequency reduction temperature threshold.

[0180] Optionally, the target temperature threshold is the frequency reduction temperature threshold minus a preset deviation value.

[0181] In some embodiments, the above method further includes: counting the first quantity of first outdoor coil temperatures greater than the frequency reduction temperature threshold among multiple first outdoor coil temperatures; and reducing the target frequency corresponding to the compressor when the first quantity is greater than or equal to the quantity threshold.

[0182] In some embodiments, the step of increasing the operating frequency of the compressor to the second operating frequency if multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and all greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor of the air conditioner is less than the set target frequency includes: If multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and all greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor is less than the set target frequency, then control the compressor to increase the operating frequency to the second operating frequency according to the frequency increase step size.

[0183] Optionally, when the first quantity is greater than or equal to the quantity threshold, reducing the target frequency corresponding to the compressor includes: when the first quantity is greater than or equal to the quantity threshold, reducing the target frequency corresponding to the compressor according to the frequency reduction step size; wherein, the frequency reduction step size is greater than or equal to the frequency increase step size.

[0184] In some embodiments, the above method further includes: after controlling the compressor to increase the operating frequency to the second operating frequency, if in the next detection period, any third outdoor coil temperature detected by the first temperature sensor is greater than the frequency reduction temperature threshold, then controlling the compressor to reduce the operating frequency to the first operating frequency.

[0185] In some embodiments, the above method further includes: obtaining the ambient temperature corresponding to the outdoor heat exchanger through the second temperature sensor; performing temperature compensation on multiple first outdoor coil temperatures when the difference obtained by subtracting the frequency reduction temperature threshold from the ambient temperature is greater than the first temperature threshold, or when the difference obtained by subtracting the ambient temperature from the frequency limit temperature threshold is greater than the first temperature threshold.

[0186] Optionally, the step of increasing the operating frequency of the compressor to the second operating frequency when multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and all greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor of the air conditioner is less than the set target frequency, includes: if in the current detection period, each compensated first outdoor coil temperature is less than the frequency reduction temperature threshold and greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor is less than the target frequency, then controlling the compressor to increase the operating frequency to the second operating frequency.

[0187] In the embodiment of the present application, when the air conditioner detects that in the current detection period, multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and all greater than or equal to the frequency limit temperature threshold, it means that the compressor is in the frequency limit state but the first outdoor coil temperature does not trigger the frequency reduction of the compressor. If the current first operating frequency of the compressor is less than the set target frequency, it indicates that the operating frequency of the compressor has not reached the desired target frequency. Then the air conditioner can control the compressor to gradually increase the operating frequency to the second operating frequency, increasing the operating frequency of the compressor in the frequency limit state, so as to maximize the refrigeration output capacity of the air conditioner on the premise of ensuring that the coil temperature of the outdoor heat exchanger does not exceed the frequency reduction temperature threshold, protecting the compressor and enabling the air conditioner to operate at a higher frequency in a high-temperature environment, providing a stronger refrigeration effect, protecting the compressor and improving the refrigeration efficiency of the air conditioner.

[0188] Such as Figure 11As shown, in one embodiment, a control device 1100 for the compressor frequency is provided, which can be applied to the above-mentioned air conditioner. The control device 1100 for the compressor frequency may include a temperature acquisition module 1110 and a frequency adjustment module 1120.

[0189] The temperature acquisition module 1110 is configured to obtain a plurality of first outdoor coil temperatures corresponding to the outdoor heat exchanger during the current detection period through a first temperature sensor.

[0190] The frequency adjustment module 1120 is configured to, if all the plurality of first outdoor coil temperatures are less than the frequency reduction temperature threshold and greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor of the air conditioner is less than the set target frequency, increase the operating frequency of the compressor to a second operating frequency, where the second operating frequency is less than or equal to the target frequency; the frequency reduction temperature threshold is used to trigger a reduction in the operating frequency of the compressor when the outdoor coil temperature is greater than or equal to the frequency reduction temperature threshold; the frequency limit temperature threshold is used to trigger the compressor to operate at the target frequency when the outdoor coil temperature is less than the frequency limit temperature threshold.

[0191] Optionally, the difference between the frequency reduction temperature threshold and the frequency limit temperature threshold is greater than the target difference.

[0192] In some embodiments, the frequency adjustment module 1120 is further configured to, if all the plurality of first outdoor coil temperatures are less than the frequency reduction temperature threshold and greater than or equal to the frequency limit temperature threshold, and the second outdoor coil temperature is less than the target temperature threshold, and the current first operating frequency of the compressor is less than the set target frequency, control the compressor to increase the operating frequency to the second operating frequency; where the second outdoor coil temperature is the first outdoor coil temperature detected last by the first temperature sensor during the current detection period; the target temperature threshold is less than the frequency reduction temperature threshold.

[0193] Optionally, the target temperature threshold is the frequency reduction temperature threshold minus a preset deviation value.

[0194] In some embodiments, the upper frequency adjustment module 1120 is further configured to count the first quantity of the first outdoor coil temperatures greater than the frequency reduction temperature threshold among the plurality of first outdoor coil temperatures; and reduce the target frequency corresponding to the compressor when the first quantity is greater than or equal to the quantity threshold.

[0195] In some embodiments, the frequency adjustment module 1120 is further configured to, if all the plurality of first outdoor coil temperatures are less than the frequency reduction temperature threshold and greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor is less than the set target frequency, control the compressor to increase the operating frequency to the second operating frequency according to the frequency increase step size.

[0196] Optionally, the frequency adjustment module 1120 is further configured to reduce the target frequency corresponding to the compressor in accordance with a frequency reduction step size when the first quantity is greater than or equal to the quantity threshold; wherein, the frequency reduction step size is greater than or equal to the frequency increase step size.

[0197] In some embodiments, the frequency adjustment module 1120 is further configured to, after controlling the compressor to increase the operating frequency to the second operating frequency, if in the next detection period, any of the third outdoor coil temperatures detected by the first temperature sensor is greater than the frequency reduction temperature threshold, then control the compressor to reduce the operating frequency to the first operating frequency.

[0198] In some embodiments, the control device 1100 for the compressor frequency may further include a temperature compensation module.

[0199] The temperature compensation module is configured to obtain the ambient temperature corresponding to the outdoor heat exchanger through the second temperature sensor; and perform temperature compensation on the multiple first outdoor coil temperatures when the difference obtained by subtracting the frequency reduction temperature threshold from the ambient temperature is greater than the first temperature threshold, or the difference obtained by subtracting the ambient temperature from the frequency limit temperature threshold is greater than the first temperature threshold.

[0200] Optionally, the frequency adjustment module 1120 is further configured to, if in the current detection period, each compensated first outdoor coil temperature is less than the frequency reduction temperature threshold and greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor is less than the target frequency, then control the compressor to increase the operating frequency to the second operating frequency.

[0201] In the embodiments of the present application, if in the current detection period, multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and all greater than or equal to the frequency limit temperature threshold, it indicates that the compressor is in a frequency limit state but the temperature of the outdoor coil does not trigger the frequency reduction of the compressor. If the current first operating frequency of the compressor is less than the set target frequency, it indicates that the operating frequency has not reached the desired target frequency. Then the controller can control the compressor to gradually increase the operating frequency to the second operating frequency, increasing the operating frequency of the compressor when it is in a frequency limit state, so as to realize the limit exertion of the refrigeration output capacity of the air conditioner on the premise of ensuring that the coil temperature of the outdoor heat exchanger does not exceed the frequency reduction temperature threshold, protect the compressor, and enable the air conditioner to operate at a higher frequency in a high-temperature environment, providing a stronger refrigeration effect, protecting the compressor and improving the refrigeration efficiency of the air conditioner.

[0202] The embodiments of the present application disclose a computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the methods described in the above embodiments.

[0203] An embodiment of the present application discloses a computer program product, including a computer program, and when the computer program is executed by a processor, it can implement the methods described in the above embodiments.

[0204] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, the appearances of "in one embodiment" or "in an embodiment" throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to the present application.

[0205] In various embodiments of the present application, it should be understood that the magnitudes of the serial numbers of the above processes do not necessarily mean the inevitable sequence of execution. The execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0206] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0207] The above has introduced in detail an air conditioner, a control method and device for the compressor frequency disclosed in the embodiments of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. At the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. An air conditioner, characterized in that, Comprising: A refrigerant circulation circuit, including a compressor, an outdoor heat exchanger, and an indoor heat exchanger connected in sequence, and the refrigerant circulation circuit is configured to circulate refrigerant; A first temperature sensor configured to detect the outdoor coil temperature corresponding to the outdoor heat exchanger; A controller configured to: Obtain a plurality of first outdoor coil temperatures detected by the first temperature sensor during the current detection period; If all of the plurality of first outdoor coil temperatures are less than the frequency reduction temperature threshold and greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor is less than the set target frequency, then control the compressor to increase the operating frequency to a second operating frequency, and the second operating frequency is less than or equal to the target frequency; The frequency reduction temperature threshold is used to trigger a reduction in the operating frequency of the compressor when the outdoor coil temperature is greater than or equal to the frequency reduction temperature threshold; the frequency limit temperature threshold is used to trigger the compressor to operate at the target frequency when the outdoor coil temperature is less than the frequency limit temperature threshold.

2. The air conditioner according to claim 1, characterized in that, The difference between the frequency reduction temperature threshold and the frequency limit temperature threshold is greater than the target difference.

3. The air conditioner according to claim 1, characterized in that The controller is further configured to: If all of the plurality of first outdoor coil temperatures are less than the frequency reduction temperature threshold and greater than or equal to the frequency limit temperature threshold, and the second outdoor coil temperature is less than the target temperature threshold, and the current first operating frequency of the compressor is less than the set target frequency, then control the compressor to increase the operating frequency to the second operating frequency; Wherein, the second outdoor coil temperature is the first outdoor coil temperature detected by the first temperature sensor last in the current detection period; the target temperature threshold is less than the frequency reduction temperature threshold.

4. The air conditioner according to claim 3, wherein, The target temperature threshold is the frequency reduction temperature threshold minus a preset deviation value.

5. The air conditioner according to claim 1, characterized in that, The controller is further configured to: Count the first quantity of the first outdoor coil temperatures greater than the frequency reduction temperature threshold among the plurality of first outdoor coil temperatures; Reduce the target frequency corresponding to the compressor when the first quantity is greater than or equal to the quantity threshold.

6. The air conditioner according to claim 5, wherein The controller is further configured to: If all of the plurality of first outdoor coil temperatures are less than the frequency reduction temperature threshold and greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor is less than the set target frequency, then control the compressor to increase the operating frequency to the second operating frequency according to the frequency increase step; and / or, Reduce the target frequency corresponding to the compressor according to the frequency decrease step when the first quantity is greater than or equal to the quantity threshold; Wherein, the frequency decrease step is greater than or equal to the frequency increase step.

7. The air conditioner according to claim 1, wherein The controller is further configured to: After controlling the compressor to increase the operating frequency to the second operating frequency, if any third outdoor coil temperature detected by the first temperature sensor in the next detection period is greater than the frequency reduction temperature threshold, then control the compressor to reduce the operating frequency to the first operating frequency.

8. The air conditioner according to claim 1, characterized in that, The air conditioner further includes a second temperature sensor configured to detect the ambient temperature corresponding to the outdoor heat exchanger; The controller is further configured to: Obtain the ambient temperature detected by the second temperature sensor; When the difference obtained by subtracting the frequency reduction temperature threshold from the ambient temperature is greater than the first temperature threshold, or the difference obtained by subtracting the ambient temperature from the frequency limit temperature threshold is greater than the first temperature threshold, perform temperature compensation on the multiple first outdoor coil temperatures; If, in the current detection cycle, each compensated first outdoor coil temperature is less than the frequency reduction temperature threshold and greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor is less than the target frequency, then control the compressor to increase the operating frequency to the second operating frequency.

9. A control method for the frequency of a compressor, characterized in that, Applied to an air conditioner, the method includes: Obtain, through a first temperature sensor, multiple first outdoor coil temperatures corresponding to an outdoor heat exchanger in the current detection cycle; If the multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor of the air conditioner is less than the set target frequency, then increase the operating frequency of the compressor to the second operating frequency, where the second operating frequency is less than or equal to the target frequency; the frequency reduction temperature threshold is used to trigger a reduction in the operating frequency of the compressor when the outdoor coil temperature is greater than or equal to the frequency reduction temperature threshold; the frequency limit temperature threshold is used to trigger the compressor to operate at the target frequency when the outdoor coil temperature is less than the frequency limit temperature threshold.

10. A control device for the frequency of a compressor, characterized in that, Applied to an air conditioner, the device includes: A temperature acquisition module, configured to obtain, through a first temperature sensor, multiple first outdoor coil temperatures corresponding to an outdoor heat exchanger in the current detection cycle; A frequency adjustment module, configured to, if the multiple first outdoor coil temperatures are all less than the frequency reduction temperature threshold and greater than or equal to the frequency limit temperature threshold, and the current first operating frequency of the compressor of the air conditioner is less than the set target frequency, then increase the operating frequency of the compressor to the second operating frequency, where the second operating frequency is less than or equal to the target frequency; the frequency reduction temperature threshold is used to trigger a reduction in the operating frequency of the compressor when the outdoor coil temperature is greater than or equal to the frequency reduction temperature threshold; the frequency limit temperature threshold is used to trigger the compressor to operate at the target frequency when the outdoor coil temperature is less than the frequency limit temperature threshold.

Images