Air conditioner control method and air conditioner

Abstract

The invention provides an air conditioner control method and an air conditioner, and the air conditioner control method provided by the invention comprises the following steps: responding to a first preset condition, and switching a compressor of the air conditioner from a first working mode to a second working mode, the lower limit value of a first frequency range corresponding to the first working mode is greater than the upper limit value of a second frequency range corresponding to the second working mode; and the current indoor environment temperature and the set temperature are collected according to the preset sampling time, the frequency of the compressor is adjusted according to the set stepping value on the basis of the current indoor environment temperature and the set temperature, and the adjusted frequency of the compressor is within the second frequency range. According to the control method, the frequency of the compressor can be adjusted through the set stepping value according to the current indoor environment temperature and the set temperature in the low-frequency operation mode (the second working mode), a fine control scene with the small indoor temperature difference is achieved, frequent starting and stopping of the compressor are not needed in the low-frequency operation mode, energy consumption can be reduced, and the control efficiency is improved. And the service life of the compressor is prolonged.

Description

Technical Field

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

[0002] In the field of air conditioning control, as people's demand for indoor thermal comfort continues to increase, the accuracy of variable-frequency air conditioner compressor operation control is becoming increasingly important. After the indoor temperature reaches the set point, the air conditioner generally needs to switch to ultra-low frequency operation to reduce energy loss and maintain a constant indoor temperature.

[0003] An existing method for controlling the frequency of variable-frequency air conditioners using a time-fuzzy algorithm can reduce room temperature fluctuations, but it doesn't account for room temperature deviations caused by frequent compressor starts and stops. Another air conditioning control method, while avoiding frequent compressor starts and stops, doesn't account for the indoor temperature recovery process, resulting in relatively crude temperature control. Furthermore, the compressor operating frequency setting is inflexible, making it unsuitable for precise control scenarios with small indoor temperature differences. Therefore, the existing technology needs improvement. Summary of the Invention

[0004] The present invention mainly provides an air conditioning control method and an air conditioner. On the one hand, the method can avoid frequent starting and stopping of the compressor, and on the other hand, it can be applied to fine control scenarios with small indoor temperature differences.

[0005] To solve the above technical problems, the first technical solution adopted by the present invention is to provide an air conditioning control method, comprising:

[0006] In response to a first preset condition, switching the compressor of the air conditioner from a first operating mode to a second operating mode, wherein a lower limit value of a first frequency range corresponding to the first operating mode is greater than an upper limit value of a second frequency range corresponding to the second operating mode;

[0007] The current indoor ambient temperature and the set temperature are collected at a preset sampling time, and the frequency of the compressor is adjusted with a set step value based on the current indoor ambient temperature and the set temperature, so that the adjusted frequency of the compressor is within the second frequency range.

[0008] In one embodiment, the first preset condition is determined based on at least one of a temperature difference between a current indoor ambient temperature and a set temperature, a current power of the compressor, and a stable operation time of the compressor.

[0009] In one embodiment, the first preset condition includes:

[0010] The absolute value of the temperature difference between the current indoor ambient temperature and the set temperature is less than or equal to the first preset temperature; and / or

[0011] The current power of the compressor is less than a preset power, and the preset power is determined based on the rated power of the compressor; and / or

[0012] The compressor operates at the current frequency for a time that is greater than or equal to a preset time.

[0013] In one embodiment, in cooling mode, adjusting the frequency of the compressor by a set step value based on the current indoor ambient temperature and the set temperature includes:

[0014] In response to a temperature difference between the current indoor ambient temperature and the set temperature being greater than or equal to a second preset temperature, increasing the frequency of the compressor by the set step value based on the current frequency of the compressor;

[0015] In response to the temperature difference between the current indoor ambient temperature and the set temperature being less than a third preset temperature, the frequency of the compressor is reduced by the set step value based on the current frequency of the compressor; wherein the second preset temperature is a positive number and the third preset temperature is a negative number.

[0016] In one embodiment, in heating mode, adjusting the frequency of the compressor by a set step value based on the current indoor ambient temperature and the set temperature includes:

[0017] In response to a temperature difference between the current indoor ambient temperature and the set temperature being greater than or equal to a second preset temperature, reducing the frequency of the compressor by the set step value based on the current frequency of the compressor;

[0018] In response to the temperature difference between the current indoor ambient temperature and the set temperature being less than a third preset temperature, the frequency of the compressor is increased by the set step value based on the current frequency of the compressor; wherein the second preset temperature is a positive number and the third preset temperature is a negative number.

[0019] In one embodiment, the method further comprises:

[0020] In response to a second preset condition, switching the compressor from the second operating mode to the third operating mode;

[0021] Among them, the lower limit value of the third frequency range corresponding to the third working mode is greater than the upper limit value of the second frequency range; the second preset condition includes: at least one of: a trigger signal, a number signal corresponding to the trigger signal, and a time signal corresponding to the trigger signal; the trigger signal includes one of a current trigger signal, a temperature trigger signal, and a load trigger signal.

[0022] In one embodiment, the current trigger signal is determined based on a current change of an outdoor unit of the air conditioner.

[0023] In one embodiment, the temperature trigger signal is determined based on one of the exhaust temperature of the air conditioner's compressor, the temperature of the air conditioner's outdoor coil, the outdoor ambient temperature, the indoor coil temperature, and the temperature difference between the current indoor ambient temperature and the set temperature.

[0024] In one embodiment, the load trigger signal is determined based on the power of the outdoor unit of the air conditioner.

[0025] In one embodiment, the step of switching the compressor from the second operating mode to the third operating mode further includes:

[0026] Increase the opening of the electronic expansion valve in the air conditioner.

[0027] In order to solve the above technical problems, the second technical solution adopted by the present invention is: to provide an air conditioner, including a compressor, a temperature sensor and a controller, and the controller is configured to execute any one of the control methods described above.

[0028] The beneficial effects of the present invention are as follows: Different from the prior art, the air conditioning control method provided by the present invention includes: in response to a first preset condition, switching the compressor of the air conditioner from the first working mode to the second working mode, wherein the lower limit value of the first frequency range corresponding to the first working mode is greater than the upper limit value of the second frequency range corresponding to the second working mode; collecting the current indoor ambient temperature and the set temperature at a preset sampling time, adjusting the frequency of the compressor with a set step value based on the current indoor ambient temperature and the set temperature, and the frequency of the compressor after adjustment is within the second frequency range. The control method of the present application can adjust the frequency of the compressor with a set step value according to the current indoor ambient temperature and the set temperature in the low-frequency operation mode (second working mode), thereby realizing a fine control scenario with a small indoor temperature difference, and in the low-frequency operation mode, the compressor does not need to be frequently started and stopped, which can reduce energy consumption, reduce temperature fluctuations, and extend the life of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 Schematic diagram of the flow of the first embodiment of the air conditioning control method of the present invention;

[0031] Figure 2 Schematic diagram of the flow of the second embodiment of the air conditioning control method of the present invention;

[0032] Figure 3 Schematic diagram of the structure of an air conditioner according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The following describes the embodiments of the present application in detail with reference to the accompanying drawings.

[0034] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0035] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship. Furthermore, "many" in this document means two or more than two.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0037] Before further describing the embodiments of the present application in detail, the nouns and terms involved in the embodiments of the present application are explained. The nouns and terms involved in the embodiments of the present application are subject to the following interpretations.

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0039] See also Figure 1 , Figure 1 This is a flow chart of a first embodiment of the air conditioning control method of the present invention, which specifically includes:

[0040] Step S11: In response to a first preset condition, switching the compressor of the air conditioner from a first operating mode to a second operating mode, wherein the lower limit value of a first frequency range corresponding to the first operating mode is greater than the upper limit value of a second frequency range corresponding to the second operating mode.

[0041] Specifically, for a variable frequency air conditioner, when the air conditioner starts working, in order to quickly reach the set temperature, the compressor frequency will increase rapidly, running at high frequency and high power, accelerating the refrigerant circulation speed, and increasing the cooling or heating output. At this time, the air conditioner compressor is in the first working mode, and in the first working mode, the frequency of the air conditioner compressor is in the first frequency range.

[0042] When a first preset condition is detected, the air conditioner compressor is switched from a first operating mode to a second operating mode, where the lower limit of a first frequency range corresponding to the first operating mode is greater than the upper limit of a second frequency range corresponding to the second operating mode. Specifically, when the first preset condition is detected, the frequency of the compressor is reduced, and the compressor is now in a low-frequency operating mode.

[0043] In one embodiment, the first preset condition is determined based on at least one of a temperature difference between a current indoor ambient temperature and a set temperature, a current power of the compressor, and a stable operation time of the compressor.

[0044] In a feasible embodiment, the first preset condition is determined based on the temperature difference between the current indoor ambient temperature and the set temperature, or the first preset condition is determined based on the current power of the compressor, or the first preset condition is determined based on the stable operation time of the compressor.

[0045] In a feasible embodiment, in order to avoid false triggering, the first preset condition is determined based on the temperature difference between the current indoor ambient temperature and the set temperature and the first preset condition includes the current power of the compressor; or the first preset condition is determined based on the temperature difference between the current indoor ambient temperature and the set temperature and the stable operation time of the compressor; or the first preset condition is determined based on the current power of the compressor and the stable operation time of the compressor.

[0046] In another feasible embodiment, in order to improve accuracy, the first preset condition is determined based on the temperature difference between the current indoor ambient temperature and the set temperature, the first preset condition includes the current power of the compressor, and the first preset condition includes the stable operation time of the compressor.

[0047] In one embodiment of the present application, the first preset condition includes the absolute value of the temperature difference between the current indoor ambient temperature and the set temperature being less than or equal to the first preset temperature. Specifically, upon detecting that the absolute value of the temperature difference between the current indoor ambient temperature and the set temperature is less than or equal to the first preset temperature, the air conditioner's compressor is switched from the first operating mode to the second operating mode. Taking heating as an example, when the set temperature is 26°C, the current indoor ambient temperature is less than 26°C, and as the air conditioner heats up, the current indoor ambient temperature gradually rises. When the current indoor ambient temperature gradually approaches the set temperature, and when the absolute value of the temperature difference |ΔT| ≤ a, the air conditioner's compressor is switched from the first operating mode to the second operating mode. Taking cooling as an example, when the set temperature is 23°C, the current indoor ambient temperature is greater than 23°C, and as the air conditioner cools, the current indoor ambient temperature gradually decreases. When the current indoor ambient temperature gradually approaches the set temperature, and when |ΔT| ≤ a, the air conditioner's compressor is switched from the first operating mode to the second operating mode.

[0048] As you can understand, as the indoor temperature approaches the set point, the compressor frequency gradually decreases, maintaining a stable indoor temperature at a lower power level to avoid temperature fluctuations. When the indoor temperature deviates very slightly from the set point, the compressor enters an ultra-low frequency operation state, maintaining a constant temperature while reducing energy consumption. The first preset temperature a can, for example, be between 1 and 1.5, specifically 1.5. As you can understand, the lower the first preset temperature, the smaller the indoor temperature fluctuations.

[0049] And / or, the first preset condition includes the current power of the compressor being less than a preset power. It is worth noting that the compressor's operating power comes from a motor, whose speed is controlled by the power supply frequency. According to electromechanical principles, within a certain range, the motor speed is approximately proportional to the power supply frequency. As the compressor speed increases, the amount of refrigerant compressed per unit time increases, the resistance overcome during the compression process increases, and more energy is consumed, thereby increasing power. Conversely, as the frequency decreases, the speed decreases, and power also decreases. In other words, compressor power and frequency are positively correlated. When the current power of the compressor is less than the preset power, it indicates that the compressor power is low. Accordingly, the compressor frequency needs to be reduced to operate in a low-frequency mode, switching the air conditioner compressor from the first operating mode to the second operating mode. It is worth noting that the preset power is determined based on the rated power of the compressor. In one embodiment, the preset power can be, for example, 10%-30% of the rated power. In a specific embodiment, the preset power can be, for example, 20% of the rated power.

[0050] And / or, the first preset condition includes the compressor operating at the current frequency for a time greater than or equal to a preset time. It is understood that when the indoor temperature deviates very slightly from the set temperature, the compressor frequency will be correspondingly reduced. After the compressor frequency is reduced, if the compressor operates at the reduced current frequency for a time greater than or equal to the preset time, it indicates that the indoor temperature has not suddenly changed during the preset time and that the indoor temperature can be maintained by simply maintaining the low-frequency mode. At this time, the air conditioner compressor is switched from the first operating mode to the second operating mode. In one embodiment, the preset time may be, for example, 4-8 minutes, and more specifically, 5 minutes.

[0051] Step S12: collecting the current indoor ambient temperature and the set temperature at a preset sampling time, and adjusting the frequency of the compressor with a set step value based on the current indoor ambient temperature and the set temperature, so that the adjusted frequency of the compressor is within the second frequency range.

[0052] After the air conditioner enters the low-frequency operating mode (i.e., the second operating mode) through step S11, the current indoor ambient temperature and the set temperature are collected at a preset sampling time. The frequency of the compressor is adjusted based on the current indoor ambient temperature and the set temperature by a set step value, so that the adjusted frequency of the compressor falls within the second frequency range.

[0053] In one embodiment, in cooling mode, in response to the temperature difference between the current indoor ambient temperature and the set temperature being greater than or equal to a second preset temperature, the compressor frequency is increased by the set step value based on the current compressor frequency. In response to the temperature difference between the current indoor ambient temperature and the set temperature being less than a third preset temperature, the compressor frequency is decreased by the set step value based on the current compressor frequency. The second preset temperature is a positive number, and the third preset temperature is a negative number.

[0054] It is worth noting that in cooling mode, if the temperature difference between the current indoor ambient temperature and the set temperature is greater than or equal to the second preset temperature, it means that the current compressor frequency is insufficient to maintain a stable indoor ambient temperature and the indoor ambient temperature is rising, so the compressor frequency needs to be increased. If the temperature difference between the current indoor ambient temperature and the set temperature is less than the third preset temperature, it means that the current compressor frequency is too high, causing the current indoor ambient temperature to continue to drop, and the compressor frequency needs to be reduced.

[0055] In the heating mode, in response to the temperature difference between the current indoor ambient temperature and the set temperature being greater than or equal to a second preset temperature, the frequency of the compressor is reduced by the set step value based on the current frequency of the compressor; in response to the temperature difference between the current indoor ambient temperature and the set temperature being less than a third preset temperature, the frequency of the compressor is increased by the set step value based on the current frequency of the compressor; wherein the second preset temperature is a positive number and the third preset temperature is a negative number.

[0056] It is worth noting that in heating mode, if the temperature difference between the current indoor ambient temperature and the set temperature is greater than or equal to the second preset temperature, it means that the current frequency of the compressor is too high, causing the current indoor ambient temperature to continue to rise, and the frequency of the compressor needs to be reduced. If the temperature difference between the current indoor ambient temperature and the set temperature is less than the third preset temperature, it means that the current frequency of the compressor is insufficient to maintain the stability of the indoor ambient temperature, and the indoor ambient temperature is decreasing, then the frequency of the compressor needs to be increased. In one embodiment, the second preset temperature is 0.1°C-0.5°C, specifically 0.2°C, and the third preset temperature is -0.5°C to -0.1°C, specifically -0.2°C.

[0057] It can be understood that, whether cooling or heating, when the temperature difference between the current indoor ambient temperature and the set temperature is 0, the compressor maintains the current frequency.

[0058] Furthermore, in an embodiment of the present application, in each preset sampling time, if the frequency of the compressor needs to be adjusted, it is increased or decreased based on the current frequency of the compressor with a set step value. In a specific embodiment, a set step value can be adjusted correspondingly in each preset sampling time. Alternatively, multiple set step values ​​can be adjusted correspondingly in each preset sampling time. In one embodiment of the present application, the preset sampling time can be set to 20 seconds, and the set step value can be 0.5HZ. That is, if the frequency of the compressor needs to be increased, the current frequency plus the set step value is used, and if the frequency of the compressor needs to be reduced, the current frequency minus the set step value is used.

[0059] In one embodiment of the present application, a PID algorithm may be used to adjust the frequency of the compressor.

[0060] It is worth noting that upon entering the initial state of ultra-low frequency mode, if the current compressor frequency is greater than the reference frequency, the current compressor frequency is directly set to the reference frequency. If the current compressor frequency is less than the reference frequency, the current compressor frequency is maintained. In one embodiment, the reference frequency may be, for example, 20 Hz. In low frequency mode, the compressor frequency is adjusted to a range of 5-25 Hz. If the frequency exceeds this range, the air conditioner may be controlled to exit low frequency mode.

[0061] The control method provided by the present invention can adaptively adjust the control accuracy and refine the control accuracy, so that the indoor ambient temperature fluctuation is controlled within a smaller stable range; and when the compressor is operating at a low frequency, the power can be reduced to 10%-30% of the rated power, reducing frequent starts and stops at night or in low-load scenarios, avoiding the start-stop energy loss of up to 30% of traditional air conditioners; the corresponding reduction in the number of starts and stops can reduce the wear of the compressor's mechanical parts such as bearings, thereby extending the service life of the compressor.

[0062] See also Figure 2 , Figure 2 This is a flow chart of a second embodiment of the air conditioning control method of the present invention. Figure 1 Compared with the embodiment shown in FIG. 1 , the difference is that after step S12, the following steps are further included:

[0063] Step S13: In response to a second preset condition, switching the compressor from the second operating mode to the third operating mode; wherein a lower limit value of a third frequency range corresponding to the third operating mode is greater than an upper limit value of the second frequency range.

[0064] Specifically, upon detecting the second preset condition, the compressor is restored from the low-frequency operating mode to the normal operating mode. It is understood that the frequency range of this third operating mode can be the same as that of the first operating mode, i.e., the upper and lower limits of the third frequency range are the same as those of the first frequency range. Of course, the frequency range of this third operating mode can partially overlap with that of the first operating mode, and this is not specifically limited.

[0065] In one embodiment, the second preset condition includes at least one of a trigger signal, a frequency signal corresponding to the trigger signal, and a time signal corresponding to the trigger signal. It is understood that the second preset condition is determined to be met by detecting the trigger signal; or by detecting multiple trigger signals; or by detecting a time signal corresponding to the trigger signal. At this point, the compressor is restored from low-frequency operating mode to normal operating mode.

[0066] In one embodiment, the trigger signal includes one of a current trigger signal, a temperature trigger signal, and a load trigger signal.

[0067] In one embodiment, the current trigger signal is determined based on the current variation of the outdoor unit of the air conditioner. Specifically, the current of the outdoor unit of the air conditioner is detected, and if the current variation exceeds a set range, such as ±15%, a current trigger signal is generated.

[0068] In one embodiment, the temperature trigger signal is determined based on one of the exhaust temperature of the air conditioner's compressor, the temperature of the air conditioner's outdoor coil, the outdoor ambient temperature, the indoor coil temperature, and the temperature difference between the current indoor ambient temperature and the set temperature.

[0069] In cooling mode, if the air conditioner's compressor exhaust temperature Td is greater than a first temperature threshold, a temperature trigger signal is generated. The first temperature threshold is, for example, 85°C. If the air conditioner's outdoor unit coil temperature Tc is greater than a second temperature threshold, a temperature trigger signal is generated. The second temperature threshold is, for example, 55°C. If the outdoor ambient temperature is greater than a third temperature threshold, a temperature trigger signal is generated. The third temperature threshold is, for example, 48°C. It should be noted that the temperature sensor is installed on the outdoor unit. In this case, the detected outdoor ambient temperature is affected by the heat of the outdoor unit and may be higher than the actual outdoor ambient temperature. If the indoor coil temperature is less than or equal to a fourth temperature threshold, a temperature trigger signal is generated. The fourth temperature threshold is, for example, 5°C. If the temperature difference between the current indoor ambient temperature and the set temperature is greater than or equal to a fifth temperature threshold, a temperature trigger signal is generated. The fifth temperature threshold is, for example, 3°C.

[0070] In heating mode, if the air conditioner's compressor exhaust temperature Td is greater than a first temperature threshold, a temperature trigger signal is generated. The first temperature threshold is, for example, 85°C. If the air conditioner's outdoor unit coil temperature Tc is less than a sixth temperature threshold, a temperature trigger signal is generated. The sixth temperature threshold is, for example, 5°C. If the outdoor ambient temperature is less than a seventh temperature threshold, a temperature trigger signal is generated. The seventh temperature threshold is, for example, 10°C. It should be noted that the temperature sensor is installed on the outdoor unit. At this time, the detected outdoor ambient temperature is affected by the heat of the outdoor unit and may be higher than the actual outdoor ambient temperature. If the indoor coil temperature is greater than or equal to an eighth temperature threshold, a temperature trigger signal is generated. The eighth temperature threshold is, for example, 55°C. If the temperature difference between the current indoor ambient temperature and the set temperature is less than or equal to a ninth temperature threshold, a temperature trigger signal is generated. The ninth temperature threshold is, for example, -3°C.

[0071] It should be noted that the above temperatures can all be detected by temperature sensors installed at corresponding positions.

[0072] Furthermore, the load trigger signal is determined based on the power of the outdoor unit of the air conditioner. In one embodiment, if the power demand of the outdoor unit is greater than 30% of the rated power, a temperature trigger signal is generated. The power demand of the outdoor unit is calculated by the current and voltage of the outdoor unit.

[0073] In one embodiment of the present application, the step of switching the compressor from the second operating mode to the third operating mode further includes increasing the opening of an electronic expansion valve in the air conditioner. For example, when a temperature trigger signal is detected, the second preset condition is met, and the opening of the electronic expansion valve in the air conditioner is increased. The low-frequency operating mode is then exited and the air conditioner is switched to the third operating mode. Increasing the compressor frequency, for example, to 30 Hz, can prevent overcurrent from occurring when the compressor continues to operate in the low-frequency operating mode.

[0074] The air conditioning control method of the present application sets system protection and exit logic, which can control the system to exit the low-frequency operation state in time when it does not meet the low-frequency operation state, thereby ensuring the safety and reliability of the system when running at low frequency.

[0075] See also Figure 3 The present application also provides an air conditioner 300, which includes a compressor 310, a temperature sensor 320 and a controller 330, wherein the controller 330 is configured to execute the above Figures 1 to 2 The control method of any embodiment. The air conditioner 300 of the present application is a variable frequency air conditioner.

[0076] The above are merely embodiments of the present invention and are not intended to limit the scope of patent protection of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the scope of patent protection of the present invention.

Claims

1. An air conditioning control method, characterized in that: include: In response to a first preset condition, switching the compressor of the air conditioner from a first operating mode to a second operating mode, wherein a lower limit value of a first frequency range corresponding to the first operating mode is greater than an upper limit value of a second frequency range corresponding to the second operating mode; The current indoor ambient temperature and the set temperature are collected at a preset sampling time, and the frequency of the compressor is adjusted with a set step value based on the current indoor ambient temperature and the set temperature, so that the adjusted frequency of the compressor is within the second frequency range.

2. The method according to claim 1, characterized in that The first preset condition is determined based on at least one of a temperature difference between a current indoor ambient temperature and a set temperature, a current power of the compressor, and a stable operation time of the compressor.

3. The method according to claim 1, characterized in that The first preset condition includes: The absolute value of the temperature difference between the current indoor ambient temperature and the set temperature is less than or equal to the first preset temperature; and / or The current power of the compressor is less than a preset power, and the preset power is determined based on the rated power of the compressor; and / or The compressor operates at the current frequency for a time that is greater than or equal to a preset time.

4. The method according to claim 1, wherein In cooling mode, adjusting the frequency of the compressor by a set step value based on the current indoor ambient temperature and the set temperature includes: In response to a temperature difference between the current indoor ambient temperature and the set temperature being greater than or equal to a second preset temperature, increasing the frequency of the compressor by the set step value based on the current frequency of the compressor; In response to the temperature difference between the current indoor ambient temperature and the set temperature being less than a third preset temperature, the frequency of the compressor is reduced by the set step value based on the current frequency of the compressor; wherein the second preset temperature is a positive number and the third preset temperature is a negative number.

5. The method according to claim 1, wherein In the heating mode, adjusting the frequency of the compressor with a set step value based on the current indoor ambient temperature and the set temperature includes: In response to a temperature difference between the current indoor ambient temperature and the set temperature being greater than or equal to a second preset temperature, reducing the frequency of the compressor by the set step value based on the current frequency of the compressor; In response to the temperature difference between the current indoor ambient temperature and the set temperature being less than a third preset temperature, the frequency of the compressor is increased by the set step value based on the current frequency of the compressor; wherein the second preset temperature is a positive number and the third preset temperature is a negative number.

6. The method according to claim 4 or 5, characterized in that The method further comprises: In response to a second preset condition, switching the compressor from the second operating mode to a third operating mode; Among them, the lower limit value of the third frequency range corresponding to the third working mode is greater than the upper limit value of the second frequency range; the second preset condition includes: at least one of: a trigger signal, a number signal corresponding to the trigger signal, and a time signal corresponding to the trigger signal; the trigger signal includes one of a current trigger signal, a temperature trigger signal, and a load trigger signal.

7. The method according to claim 6, characterized in that The current trigger signal is determined based on a current change of an outdoor unit of the air conditioner.

8. The method according to claim 6, characterized in that The temperature trigger signal is determined based on one of the exhaust temperature of the air conditioner's compressor, the temperature of the air conditioner's outdoor coil, the outdoor ambient temperature, the indoor coil temperature, and the temperature difference between the current indoor ambient temperature and the set temperature.

9. The method according to claim 6, characterized in that The load trigger signal is determined based on the power of the outdoor unit of the air conditioner.

10. The method according to claim 6, characterized in that The step of switching the compressor from the second operating mode to the third operating mode further includes: Increase the opening of the electronic expansion valve in the air conditioner.

11. An air conditioner comprising a compressor, a temperature sensor and a controller, characterized in that: The controller is configured to execute the control method according to any one of claims 1 to 10.

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