Air conditioner and control method thereof

Abstract

The application relates to an air conditioner and a control method thereof, and belongs to the technical field of air conditioners. The air conditioner comprises an outdoor coil, a fan, a compressor, an ambient temperature sensor, an outdoor coil temperature sensor and a controller. After the air conditioner is started to cool, the controller controls the fan to operate, and the outdoor ambient temperature T2 and the outdoor coil temperature are obtained. After a first time period, the compressor is controlled to operate, and the outdoor ambient temperature T1 in a second time period of compressor operation is obtained. Whether the air conditioner is in a poor-ventilation installation environment is judged according to the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2. If the difference is greater than a third threshold value, it is determined that the air conditioner is in the poor-ventilation installation environment, and the protection value of the outdoor coil temperature is adjusted. Otherwise, the protection value of the outdoor coil temperature is not adjusted, the reliability of the air conditioner is ensured, the refrigeration capacity in a high-temperature environment is improved, and the problem that the refrigeration capacity of a traditional fixed-protection-value scheme suddenly decreases when ventilation is poor is avoided.

Description

Technical Field

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

[0002] Air conditioners are typically installed in well-ventilated open spaces, such as building exteriors, rooftops, or dedicated platforms. Under standard operating conditions, the outdoor fan drives airflow through the outdoor coil, enabling efficient heat exchange between the refrigerant and the outside air. At this time, the outdoor coil temperature is maintained within a reasonable range, the air conditioner pressure is stable, and its cooling capacity is fully utilized.

[0003] When an air conditioner is installed in a poorly ventilated environment (such as inside a grille, in a narrow courtyard, or near a wall), airflow is restricted, and heat exchange efficiency decreases significantly. At this time, the outdoor coil temperature rises rapidly, causing the high-pressure side pressure of the system to increase, and the compressor load to increase. Under high-temperature and high-pressure conditions, the system is prone to triggering overload protection, resulting in a significant decrease in cooling capacity. Simultaneously, due to insufficient heat dissipation from the outdoor coil, the compressor remains under high load for extended periods, not only reducing system energy efficiency but also potentially affecting the equipment's lifespan.

[0004] In existing technologies, air conditioner control in poorly ventilated environments primarily relies on fixed outdoor coil temperature protection values. When an excessively high outdoor coil temperature is detected, the air conditioner will reduce its frequency or shut down to prevent damage. However, this method fails to adequately consider the actual impact of different installation environments on heat dissipation, leading to frequent activation of the protection mode in scenarios with severely limited ventilation, resulting in insufficient cooling capacity to meet user needs. Furthermore, traditional control strategies lack adaptive adjustments for short-term high-temperature conditions, making it difficult to optimize operating efficiency while ensuring system reliability. Summary of the Invention

[0005] This application provides an air conditioner and its control method to at least address the problem in related technologies where air conditioner control in poorly ventilated environments primarily relies on a fixed outdoor coil temperature protection value. When an excessively high outdoor coil temperature is detected, the air conditioner will reduce its frequency or shut down to prevent equipment damage. However, this approach fails to adequately consider the actual impact of different installation environments on heat dissipation, leading to frequent activation of the air conditioner's protection mode and insufficient cooling capacity to meet user needs in scenarios with severely limited ventilation.

[0006] In a first aspect, this application provides an air conditioner, comprising: Outdoor coil, which is used for heat exchange with the outside air; A fan is used to drive airflow through the outdoor coil; A compressor is used to compress refrigerant gas and deliver the refrigerant gas to the outdoor coil for circulation. An ambient temperature sensor is used to detect the outdoor ambient temperature. Outdoor coil temperature sensor, used to detect the temperature of outdoor coil; The controller is electrically connected to the compressor, the fan, the ambient temperature sensor, and the outdoor coil temperature sensor; the controller is configured to: After the air conditioner starts cooling, the fan is controlled to run, and the outdoor ambient temperature T2 and the outdoor coil temperature are obtained during the second time period of the compressor's operation. After the first time period, the compressor is controlled to run, and the outdoor ambient temperature T1 is obtained; The difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 is used to determine whether the air conditioner is installed in a poorly ventilated environment. If the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 is greater than the third threshold, it is determined that the air conditioner is installed in a poorly ventilated environment, and the protection value of the outdoor coil temperature is adjusted. Otherwise, it is determined that the air conditioner is not installed in a poorly ventilated environment, and the protection value of the outdoor coil temperature is not adjusted.

[0007] When an air conditioner is installed in a normal environment, the outdoor ambient temperature T1 and the outdoor ambient temperature T2 are not much different. However, if the air conditioner is installed in a poorly ventilated environment, the operation of the fan will cause the outdoor ambient temperature T1 to rise rapidly, resulting in the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 exceeding the third threshold.

[0008] When the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 is detected to be greater than the third threshold, the coil temperature protection value is increased, allowing the system to continue operating at a higher temperature, extending the effective cooling time, and reducing the number of times the protection shutdown is triggered.

[0009] In some embodiments, the controller is further configured to: Whether the air conditioner is in a high-temperature environment is determined based on whether the outdoor ambient temperature T1 is greater than a first threshold. If the outdoor ambient temperature T1 is greater than the first threshold, it is determined that the air conditioner is in a high-temperature environment, and it is further determined whether the air conditioner is in a grille environment. Otherwise, it is determined that the air conditioner is not in a high-temperature environment, and the protection value of the outdoor coil temperature is not adjusted.

[0010] By determining whether the outdoor ambient temperature T1 during the second period of compressor operation is higher than the first threshold, it is possible to identify whether the air conditioner is in a high-temperature environment.

[0011] When the outdoor ambient temperature T1 is greater than the first threshold, it indicates that the current air conditioner is in a high-temperature period with a relatively short annual cumulative operating time. At this time, the air conditioner is allowed to appropriately increase the upper limit of its operating parameters.

[0012] When the outdoor ambient temperature T1 is greater than the first threshold, the heat dissipation load of the air conditioner increases significantly, and the impact of obstructions such as grilles on heat dissipation is aggravated.

[0013] The system only triggers the grid environment judgment logic in high-temperature environments, reducing redundant detection in low-temperature scenarios, improving system judgment efficiency, and avoiding unnecessary protection actions caused by misjudgments.

[0014] In some embodiments, the controller is further configured to: After determining that the air conditioner is in a high-temperature environment, the air conditioner is determined to be in a grid environment based on whether the difference between the outdoor coil temperature and the outdoor ambient temperature T2 is less than a second threshold. If the difference between the outdoor coil temperature and the outdoor ambient temperature T2 is less than the second threshold, it is determined that the air conditioner is in a grille environment, and it is further determined whether the air conditioner is in a poorly ventilated installation environment. Otherwise, it is determined that the air conditioner is not in a grid environment, and the protection value of the outdoor coil temperature is not adjusted.

[0015] By comparing the difference between the outdoor coil temperature and the outdoor ambient temperature T2, it can be accurately determined whether the air conditioner is in a grid environment.

[0016] When the air conditioner is in a grid environment, the heat exchange efficiency between the outdoor coil and the ambient air decreases, resulting in the difference between the outdoor coil temperature and the outdoor ambient temperature T2 being significantly lower than the normal level.

[0017] By identifying physically obstructed grid environments using temperature difference characteristics, the accuracy of identification can be improved.

[0018] In some embodiments, the controller is further configured to: When it is determined that the air conditioner is installed in a poorly ventilated environment, the protection value of the outdoor coil temperature is increased by a corresponding compensation value according to the preset temperature difference range to which the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 belongs. Different preset temperature difference ranges correspond to different compensation values.

[0019] The protection value compensation is dynamically adjusted according to the preset temperature difference range to which the difference between outdoor ambient temperature T1 and outdoor ambient temperature T2 belongs, so as to achieve a fine matching of protection strategies and achieve the optimal balance between safe operation and energy efficiency.

[0020] A smaller compensation value can handle minor heat dissipation obstruction and avoid frequent shutdowns, while a larger compensation value can ensure that the air conditioner can continue to operate in extreme scenarios.

[0021] In some embodiments, the controller is further configured to: The compensation value increases as the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 falls within a preset temperature difference range.

[0022] By setting a nonlinear relationship where the compensation value increases with the increase of temperature difference, a direct proportional response between the protection strength and the degree of risk is achieved, ensuring that the system can obtain optimal protection under different ventilation conditions.

[0023] When the difference between outdoor ambient temperature T1 and outdoor ambient temperature T2 falls within a small preset temperature difference range, the system only needs to slightly increase the protection value to maintain stability. When the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 falls within a large preset temperature difference range, it indicates that the air conditioner's heat dissipation is severely obstructed, and the protection value needs to be significantly increased to avoid high-pressure risks.

[0024] In some embodiments, the controller is further configured to: When it is determined that the air conditioner is installed in a poorly ventilated environment, the operating frequency of the compressor is increased according to the preset temperature difference range to which the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 belongs.

[0025] In poorly ventilated installation environments, the reduced heat exchange efficiency caused by poor ventilation can be compensated by increasing the compressor's operating frequency and the amount of refrigerant circulating.

[0026] In some embodiments, the controller is further configured to: The operating frequency of the compressor increases as the compensation value for the increase of the protection value of the outdoor coil temperature increases.

[0027] Establish a positive proportional relationship between compressor operating frequency and protection value compensation to achieve dynamic load matching, ensuring that the air conditioner can improve cooling capacity and prevent system overheating in extreme environments.

[0028] This ensures that the compressor's operating frequency always matches the air conditioner's heat resistance. It fully utilizes the compressor's short-term overload capacity, avoiding the risk of over-adjustment.

[0029] In some embodiments, the controller is further configured to: After adjusting the protection value of the outdoor coil temperature, the rate of change of the temperature of the refrigerant gas delivered by the compressor is obtained. If the rate of change of the temperature of the refrigerant gas delivered by the compressor exceeds a preset safety threshold, the operating frequency of the compressor is reduced.

[0030] By monitoring the rate of change of refrigerant temperature in real time, a rapid-response safety feedback mechanism is established during the dynamic adjustment process to prevent potential overheating risks caused by the increase of protection values.

[0031] If the compressor operating frequency increases rapidly after the protection value is raised, the refrigerant temperature may rise sharply. Even if the current temperature has not reached the new protection value, there is still a risk of overheating.

[0032] When the rate of change of the refrigerant gas temperature delivered by the compressor exceeds the preset safety threshold, the compressor operating frequency is immediately reduced while the fan is kept running at high speed, which can reduce the peak refrigerant temperature and improve system stability.

[0033] In some embodiments, the controller is further configured to: When it is determined that the air conditioner is installed in a poorly ventilated environment, the fan speed is increased according to the preset temperature difference range to which the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 belongs.

[0034] In poorly ventilated environments, the forced convection cooling effect is enhanced by the graded linkage between the fan speed and the preset temperature difference range between outdoor ambient temperature T1 and outdoor ambient temperature T2. This, combined with the adjustment of protection values, creates a synergistic effect and further improves the system's resilience.

[0035] Increasing the fan speed can increase the airflow velocity on the surface of the outdoor coil, thereby improving the heat transfer coefficient.

[0036] Secondly, this application provides an air conditioner control method, including: When the air conditioner starts cooling, the fan starts running and the outdoor ambient temperature T2 is detected by the ambient temperature sensor. The outdoor coil temperature is detected by an outdoor coil temperature sensor; After the first time period, the compressor is started and running, and the outdoor ambient temperature T1 during the second time period of compressor operation is detected by the ambient temperature sensor. The difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 is used to determine whether the air conditioner is installed in a poorly ventilated environment. If the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 is greater than the third threshold, it is determined that the air conditioner is installed in a poorly ventilated environment, and the protection value of the outdoor coil temperature is adjusted. Otherwise, it is determined that the air conditioner is not installed in a poorly ventilated environment, and the protection value of the outdoor coil temperature is not adjusted.

[0037] Compared with related technologies, the control method provided by this invention establishes a time-sequential environmental status detection process by first starting the fan to obtain initial environmental parameters and then starting the compressor to detect operating parameters.

[0038] The temperature difference judgment logic is simple and reliable, accurately identifying poor ventilation characteristics, while the dynamic adjustment of the outdoor coil temperature protection value ensures that the identification results can be translated into effective control actions. This achieves a complete closed loop from environmental detection to parameter adjustment, automatically adapting to different installation environments without manual intervention, significantly improving the air conditioner's adaptability under complex operating conditions.

[0039] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0040] The accompanying drawings, which are included to provide an understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram showing the correspondence between the operating frequency of the compressor and the condensing pressure and evaporating pressure according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of an air conditioner according to an embodiment of this application; Figure 3 The operation flow of the controller according to the embodiments of this application Figure 1 ; Figure 4 The operation flow of the controller according to the embodiments of this application Figure 2 ; Figure 5 The operation flow of the controller according to the embodiments of this application Figure 3 ; Figure 6 The operation flow of the controller according to the embodiments of this application Figure 4 ; Figure 7 This is the operation flow of an air conditioner according to an embodiment of this application. Figure 5 ; Figure 8 This is the operation flow of an air conditioner according to an embodiment of this application. Figure 6 ; Figure 9 This is a flowchart of an air conditioner control method according to an embodiment of this application; Figure 10This is a hardware configuration diagram of the controller according to an embodiment of this application.

[0041] In the picture: 1. Fan; 2. Compressor; 3. Ambient temperature sensor; 4. Outdoor coil temperature sensor; 5. Controller; 6. Electronic expansion valve; 80. Bus; 81. Processor; 82. Memory; 83. Communication interface. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application. Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0043] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0044] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “a,” “an,” “an,” “the,” and similar words used in this application do not indicate quantity limitation and may indicate singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms “connected,” “linked,” “coupled,” and similar words used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Multiple” used in this application refers to two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following objects are in an "or" relationship. The terms "first," "second," and "third" used in this application are merely to distinguish similar objects and do not represent a specific ordering of the objects.

[0045] Air conditioners are typically installed in well-ventilated open spaces, such as building exteriors, rooftops, or dedicated platforms. Under standard operating conditions, when the air conditioner is cooling, the compressor compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gas and delivers it to the outdoor coil.

[0046] At this time, the outdoor fan drives air to flow through the outdoor coil, allowing the high-temperature, high-pressure refrigerant gas to fully exchange heat with the outside air. After the refrigerant condenses into a high-pressure liquid, it passes through the electronic expansion valve for throttling and pressure reduction, and finally enters the indoor unit to complete the refrigeration cycle.

[0047] During this process, the temperature and condensing pressure of the refrigerant gas delivered by the compressor are maintained within a reasonable range, the air conditioner pressure is stable, and the cooling capacity is fully utilized.

[0048] The safe operation of the compressor requires constraints on the system's maximum pressure. Different operating frequencies correspond to different permissible maximum pressures for the air conditioning system, and a certain frequency has only one permissible maximum system pressure.

[0049] like Figure 1 As shown, when the air conditioner is running in cooling mode, the highest pressure of the air conditioner is the condensing pressure. The condensing temperature corresponds one-to-one with the condensing pressure. The high pressure is determined by the outdoor coil temperature, which in turn constrains the compressor's operating frequency under different operating conditions.

[0050] The maximum operating pressure of an air conditioner during compressor operation is determined based on a certain operating time. The shorter the cumulative operating time, the higher the maximum allowable system pressure of the compressor.

[0051] The air conditioner operates for less than 2 hours per year when the outdoor temperature is above 50℃. Therefore, under specific ambient temperatures, depending on the severity of the installation environment, appropriately increasing the operating pressure of the air conditioner can reduce the occurrence of protective shutdowns and improve cooling capacity.

[0052] However, when the outdoor ambient temperature is high or the heat exchange efficiency decreases, the temperature of the refrigerant gas delivered by the compressor will rise significantly. If this exceeds the compressor's allowable limit, the air conditioner may trigger its protection mechanism, causing it to reduce its frequency or shut down, affecting the continuous operation of the air conditioner and the user experience. When an air conditioner is installed in a poorly ventilated environment (such as inside a grille, in a narrow courtyard, or near a wall), airflow is severely restricted, and the heat dissipation efficiency of the outdoor coil is significantly reduced.

[0053] At this point, the high-temperature, high-pressure refrigerant gas cannot be cooled sufficiently, causing the condensing pressure to rise rapidly, increasing the compressor load, and causing the refrigerant gas temperature to rise sharply.

[0054] The reduced outdoor airflow prevents the air conditioner from operating at its optimal state, resulting in decreased cooling capacity and increased power consumption.

[0055] The current fan control mode is based on the air conditioner being in a well-ventilated environment. The fan speed is divided into low, medium and high speeds, and the outdoor air volume is matched according to the compressor's operating frequency and the outdoor ambient temperature. However, when the air conditioner is in a grille environment or other relatively enclosed environment, the fan's original set operating speed can no longer meet the requirements for optimal air volume. Therefore, the outdoor speed needs to be intelligently adjusted to improve the problem of poor ventilation.

[0056] Among them, the grille environment refers to the air conditioner being surrounded by a closed or semi-closed grille structure, which further hinders air circulation.

[0057] The grille not only reduces the amount of air entering the air, but also causes the temperature inside the grille to accumulate, creating a high-temperature microenvironment.

[0058] Prolonged high-load operation of the compressor may shorten its lifespan and increase the risk of user complaints.

[0059] Existing air conditioners rely primarily on fixed outdoor coil temperature protection values ​​for control in poorly ventilated environments, without considering the dynamic impact of the installation environment on heat dissipation capacity.

[0060] One issue is that a fixed outdoor coil temperature protection value may cause the air conditioner to frequently shut down under high-temperature conditions. Although the compressor can operate at higher temperatures for short periods, current technology cannot utilize this characteristic, resulting in wasted cooling capacity.

[0061] Current technology lacks real-time assessment of ventilation conditions, and air conditioners may continue to operate according to standard logic even when heat dissipation is severely inadequate, leading to prolonged compressor overheating and decreased reliability.

[0062] In addition, traditional solutions only adjust passively after the temperature exceeds the limit, and cannot optimize parameters in advance by anticipating poor ventilation.

[0063] To address the aforementioned issues, this application proposes an air conditioner that accurately determines whether the air conditioner is in a poorly ventilated environment by comparing changes in outdoor ambient temperature during fan and compressor operation. By adjusting cooling protection limits, it enhances cooling capacity in high-temperature environments and reduces user complaint rates.

[0064] Figure 2 This is a structural schematic diagram of an air conditioner according to an embodiment of this application. Figure 2 As shown, the air conditioner includes an outdoor unit.

[0065] In some embodiments, the outdoor unit can be a side-discharge outdoor unit or a top-discharge outdoor unit.

[0066] In some embodiments, when the air conditioner is in cooling mode, the outdoor unit is used to release the heat carried by the refrigerant into the outside air to achieve the cooling function.

[0067] In some embodiments, the air conditioner further includes an outdoor coil. The outdoor coil is used for heat exchange with the outside air.

[0068] Specifically, the outdoor coil is located at the rear and / or side of the outdoor unit, arranged in a U-shape or ring, and exchanges heat with the air through aluminum fins and copper pipes.

[0069] The outdoor coil adopts a U-shaped or ring structure with 3-4 rows of staggered arrangement, with a fin spacing of 1.8 mm to 2.2 mm and a copper tube outer diameter of 7 mm to 9.52 mm.

[0070] The fins of the outdoor coil are designed with a corrugated disturbance structure to increase turbulence and improve heat exchange efficiency by 15 to 20% compared to traditional designs.

[0071] The outdoor coil is installed on the air inlet side of the fan 1 to ensure that the airflow passes through the outdoor coil before passing through the fan 1, forming a complete airflow path.

[0072] It should be noted that the installation process for outdoor coils is not limited to the above-mentioned methods.

[0073] In some embodiments, the air conditioner further includes a fan 1. The fan 1 is used to drive airflow through the outdoor coil.

[0074] Specifically, in the side-discharge outdoor unit, the fan 1 is installed on the front side of the side-discharge outdoor unit.

[0075] In the top-discharge outdoor unit, the fan 1 is installed on the top of the top-discharge outdoor unit.

[0076] Fan 1 is mechanically fixed to the outdoor coil to form a spatial connection. Fan 1 enhances heat exchange efficiency by forcibly driving airflow through the outdoor coil.

[0077] The air volume of fan 1 is dynamically adjusted according to the outdoor coil temperature.

[0078] It should be noted that the installation process of fan 1 is not limited to the above installation method.

[0079] In some embodiments, the air conditioner further includes a compressor 2. When the air conditioner is in cooling mode, the compressor 2 is used to compress refrigerant gas and deliver the refrigerant gas to the outdoor coil for circulation.

[0080] Specifically, compressor 2 is installed at the bottom of the outdoor unit and connected to the outdoor coil piping.

[0081] It should be noted that the installation process of compressor 2 is not limited to the above installation method.

[0082] In some embodiments, the air conditioner may include an ambient temperature sensor 3. The ambient temperature sensor 3 is used to detect the outdoor ambient temperature.

[0083] In some embodiments, the air conditioner may include an outdoor coil temperature sensor 4. The outdoor coil temperature sensor 4 is used to detect the outdoor coil temperature.

[0084] In some embodiments, the air conditioner may include a controller 5. The controller 5 is electrically connected to the compressor 2, the fan 1, the ambient temperature sensor 3, and the outdoor coil temperature sensor 4. The controller 5 can control the operation of the compressor 2 and the fan 1 based on the temperatures detected by the ambient temperature sensor 3 and the outdoor coil temperature sensor 4.

[0085] In some embodiments, such as Figure 3 As shown, after the air conditioner starts cooling, the control fan 1 is activated.

[0086] During the first period of operation of fan 1, the outdoor ambient temperature T2 and the outdoor coil temperature are obtained.

[0087] After the first time period, the compressor 2 is controlled to run, and the outdoor ambient temperature T1 during the second time period of compressor 2 operation is obtained.

[0088] Determine whether the air conditioner is installed in a poorly ventilated environment based on the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2. If the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 is greater than the third threshold, it is determined that the air conditioner is installed in a poorly ventilated environment, and the protection value of the outdoor coil temperature is adjusted. Otherwise, it is determined that the air conditioner is not installed in a poorly ventilated environment, and the protection value of the outdoor coil temperature is not adjusted.

[0089] By obtaining the outdoor ambient temperature T1 and outdoor ambient temperature T2 before and after the compressor 3 starts running, and calculating the difference between the two, it is possible to accurately determine whether the air conditioner is in a poorly ventilated environment.

[0090] When an air conditioner is installed in a normal environment, the outdoor ambient temperature T1 and the outdoor ambient temperature T2 are not much different.

[0091] If an air conditioner is installed in a poorly ventilated environment, the operation of the fan will cause the outdoor ambient temperature T1 to rise rapidly, resulting in the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 exceeding the third threshold.

[0092] Therefore, by obtaining the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 before and after the compressor 2 starts running, it is possible to accurately identify whether the air conditioner is in a poorly ventilated environment.

[0093] When the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 is greater than the third threshold, it indicates that there is a significant heat accumulation phenomenon around the air conditioner.

[0094] At this time, dynamically adjusting the outdoor coil temperature protection value can avoid premature frequency reduction or shutdown caused by traditional fixed protection thresholds, allowing the system to continue operating at higher temperatures, extending the effective cooling time, and reducing the number of times protection shutdown is triggered.

[0095] Specifically, the initial start-up time of fan 1 can be 5 seconds or other time periods. By adjusting the start-up time of fan 1, air exchange between the inside and outside of the grid environment can be completed, eliminating initial temperature errors and creating low-pressure conditions for compressor 2 to start.

[0096] By optimizing the start-up sequence of fan 1 and compressor 2, and combining it with dynamic protection value adjustment, the performance of the air conditioner and the reliability of the air conditioner under poor ventilation conditions are improved.

[0097] Among them, fan 1 runs 5 seconds in advance to complete airflow replacement, so that the air exchange rate between the inside and outside of the grid environment reaches more than 90%, reducing the error of ambient temperature detection and providing an accurate benchmark for subsequent control decisions.

[0098] In some embodiments, the outdoor ambient temperature T1 is the average temperature during the second operating time of the compressor 2.

[0099] By setting the average temperature of the second time period as the outdoor ambient temperature T1, the influence of instantaneous temperature fluctuations on the judgment can be eliminated, data stability can be improved, and the number of false alarms can be reduced.

[0100] Specifically, the second time period can range from 480 seconds to 720 seconds. For example, the second time period can be set to 600 seconds.

[0101] Detecting outdoor ambient temperature before and after compressor operation allows the air conditioner to identify abnormalities in advance, providing a critical time window for adjusting protection values. This also enables adaptation to different climate zones, enhancing the solution's versatility.

[0102] It should be noted that the difference between outdoor ambient temperature T1 and outdoor ambient temperature T2 is taken as the absolute value of the difference.

[0103] Specifically, the third threshold can range from 4 degrees Celsius to 6 degrees Celsius. For example, the third threshold can be set to 5 degrees Celsius.

[0104] In well-ventilated environments, outdoor ambient temperature fluctuations are usually small over short periods of time, generally not exceeding 3 degrees Celsius.

[0105] When the third threshold is set to 4 to 6 degrees Celsius, it can effectively filter out interference from natural fluctuations in ambient temperature and avoid misjudgments caused by accidental factors.

[0106] If the third threshold is set to 2 degrees Celsius, it may trigger a false alarm due to slight changes in ambient temperature. If the third threshold is set to 8 degrees Celsius, it may miss scenarios with slight ventilation obstruction, causing the system to operate under high load for a long time without timely adjustment.

[0107] By comparing the ambient temperature rise before and after compressor 2 starts, the degree of heat dissipation obstruction can be directly reflected, which is more sensitive than static temperature detection.

[0108] In some embodiments, after the outdoor coil temperature protection value is adjusted, the air conditioner runs for a period of time, and then it is determined whether the air conditioner is in a poorly ventilated installation environment according to the above conditions. If it is determined that the air conditioner is not in a poorly ventilated installation environment, the outdoor coil temperature protection value is adjusted back to the value before adjustment.

[0109] In some embodiments, such as Figure 4 As shown, whether the air conditioner is in a high-temperature environment is determined based on whether the outdoor ambient temperature T1 is greater than the first threshold. If the outdoor ambient temperature T1 is greater than the first threshold, it is determined that the air conditioner is in a high-temperature environment, and it is further determined whether the air conditioner is in a grid environment. Otherwise, it is determined that the air conditioner is not in a high-temperature environment, and the protection value of the outdoor coil temperature is not adjusted.

[0110] By determining whether the outdoor ambient temperature T1 during the second period of compressor 2 operation is higher than the first threshold, it can be identified whether the air conditioner is in a high-temperature environment.

[0111] When the outdoor ambient temperature T1 is greater than the first threshold, the heat dissipation load of the air conditioner increases significantly, and the impact of obstructions such as grilles on heat dissipation is aggravated.

[0112] The system only triggers the grid environment judgment logic in high-temperature environments, reducing redundant detection in low-temperature scenarios, improving system judgment efficiency, and avoiding unnecessary protection actions caused by misjudgments.

[0113] It should be noted that when it is determined that the air conditioner is not in a high-temperature environment, the air conditioner will operate in normal mode.

[0114] When the air conditioner operates in normal mode, it can fully realize heat exchange, and all components inside the air conditioner are in a highly efficient and stable working state.

[0115] In normal operating mode, compressor 2 operates at a preset power, and the cooling efficiency reaches the nominal value.

[0116] Fan 1 operates at full speed to ensure smooth air circulation and quickly reach the set temperature.

[0117] The air conditioner does not require overheat or overload protection functions to be activated. Its operating noise and vibration are within the normal range, and the lifespan of its components is not affected by abnormal operating conditions.

[0118] By determining whether the outdoor ambient temperature T1 is greater than the first threshold, it can be determined whether the outdoor ambient temperature T1 belongs to the temperature range where the air conditioner has been running for a relatively short time.

[0119] If the outdoor ambient temperature T1 exceeds the first threshold, the air conditioner will operate for a shorter period in the high-temperature outdoor environment. Therefore, the protection value for the temperature of the refrigerant gas delivered by compressor 2 can be appropriately increased. This prevents the air conditioner from operating under high-pressure conditions for extended periods, ensuring the reliability of compressor 2.

[0120] Specifically, the first threshold value can range from 45 degrees Celsius to 50 degrees Celsius. For example, setting the first threshold to 48 degrees Celsius can effectively distinguish short-term high temperatures and ensure that compressor 2 operates within the permissible short-term overload range.

[0121] High-temperature conditions are screened by outdoor ambient temperature T1, eliminating unnecessary adjustments in low-temperature environments, reducing the system's computational burden, and further analyzing temperature differences only under high-temperature conditions. This avoids false triggering caused by small temperature differences between the inside and outside of the grille environment during low-temperature seasons, improves the accuracy of identifying poorly ventilated environments, and reduces the energy consumption of ineffective speed regulation of fan 1.

[0122] In some embodiments, such as Figure 5 As shown, after determining that the air conditioner is in a high-temperature environment, the difference between the outdoor coil temperature and the outdoor ambient temperature T2 is used to determine whether the air conditioner is in a grid environment. If the difference between the outdoor coil temperature and the outdoor ambient temperature T2 is less than the second threshold, the air conditioner is determined to be in a grille environment, and it is further determined whether the air conditioner is in a poorly ventilated installation environment. Otherwise, it is determined that the air conditioner is not in a grid environment, and the protection value of the outdoor coil temperature is not adjusted.

[0123] By comparing the difference between the outdoor coil temperature and the outdoor ambient temperature T2, it can be accurately determined whether the air conditioner is in a grid environment.

[0124] When the air conditioner is in a grid environment, the heat exchange efficiency between the outdoor coil and the ambient air decreases, resulting in the difference between the outdoor coil temperature and the outdoor ambient temperature T2 being significantly lower than the normal level.

[0125] By identifying physically obstructed grid environments using temperature difference characteristics, the accuracy of identification can be improved.

[0126] It should be noted that once it is determined that the air conditioner is not in a grid environment, the air conditioner can operate according to the operating mode after the air conditioner starts cooling.

[0127] After the air conditioner starts cooling, it can operate in either normal mode or mode for use in poorly ventilated installation environments.

[0128] Among them, when the air conditioner is installed in a poorly ventilated environment, the air conditioner will enter a restricted operation mode or trigger a protection mechanism to avoid malfunctions caused by overheating, abnormal pressure, etc.

[0129] In poorly ventilated installation environments, the outdoor coil cannot effectively dissipate heat, causing the compressor 2's discharge pressure to rise. After detecting the high-pressure protection signal, the air conditioner will automatically reduce the compressor 2's frequency or even temporarily stop operating.

[0130] At this time, the air conditioner will experience a significant decrease in cooling effect, sudden changes in noise, and frequent start-stop cycles.

[0131] Specifically, the second threshold can range from 0 degrees Celsius to 2 degrees Celsius. For example, the second threshold can be set to 1 degree Celsius.

[0132] By setting a second threshold to determine whether the air conditioner is in a grid environment, the physical characteristics of the grid environment can be identified and judged.

[0133] By determining the conditions, subsequent adjustments are only triggered when the air conditioner is in a grid environment, avoiding over-adjustment due to partial obstruction and reducing the grid misidentification rate.

[0134] At the same time, it protects compressor 2 to continue operating according to standard logic in non-uniform heat dissipation environments, extending the life of critical components.

[0135] In some embodiments, such as Figure 6 As shown, based on the preset temperature difference range between outdoor ambient temperature T1 and outdoor ambient temperature T2, the protection value of the outdoor coil temperature is increased by a corresponding compensation value. Different preset temperature difference ranges correspond to different compensation values.

[0136] The protection value compensation is dynamically adjusted according to the preset temperature difference range to which the difference between outdoor ambient temperature T1 and outdoor ambient temperature T2 belongs, so as to achieve a fine matching of protection strategies and achieve the optimal balance between safe operation and energy efficiency.

[0137] A smaller compensation value can handle minor heat dissipation obstruction and avoid frequent shutdowns. A larger compensation value can ensure that the air conditioner can operate continuously in extreme scenarios.

[0138] In some embodiments, the compensation value increases as the preset temperature difference range to which the difference between outdoor ambient temperature T1 and outdoor ambient temperature T2 belongs increases.

[0139] By setting a nonlinear relationship where the compensation value increases with the increase of temperature difference, a direct proportional response between the protection strength and the degree of risk is achieved, ensuring that the system can obtain optimal protection under different ventilation conditions.

[0140] When the difference between outdoor ambient temperature T1 and outdoor ambient temperature T2 falls within a small preset temperature difference range, the system only needs to slightly increase the protection value to maintain stability. When the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 falls within a large preset temperature difference range, it indicates that the air conditioner's heat dissipation is severely obstructed, and the protection value needs to be significantly increased to avoid high-pressure risks.

[0141] Specifically, the compensation value for the protection value of the outdoor coil temperature increases within a range of 0.5 degrees Celsius to 1.5 degrees Celsius.

[0142] Specifically, the degree of influence of the grille environment on the air conditioner is determined based on the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2.

[0143] When the influence of the grille environment on the air conditioner is small and continues for a preset time period, the protection value of the outdoor coil temperature will be increased by the first compensation value.

[0144] For example, when the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 is greater than or equal to 4 degrees Celsius and less than 5 degrees Celsius, and lasts for 30 seconds, the protection value of the outdoor coil temperature will be increased by 0.5 degrees Celsius accordingly.

[0145] When the influence of the grille environment on the air conditioner is moderate and continues for a preset time period, the protection value of the outdoor coil temperature will be increased by a second compensation value.

[0146] For example, when the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 is greater than or equal to 5 degrees Celsius and less than 6 degrees Celsius, and lasts for 30 seconds, the protection value of the outdoor coil temperature will be increased by 1 degree Celsius accordingly.

[0147] When the grid environment has a significant impact on the air conditioner and this impact persists for a preset period of time, the protection value for the outdoor coil temperature will be increased by a third compensation value.

[0148] For example, when the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 is greater than or equal to 6 degrees Celsius and lasts for 30 seconds, the protection value of the outdoor coil temperature will be increased by 1.5 degrees Celsius accordingly.

[0149] The increased compensation value for the outdoor coil temperature protection value achieves an optimal balance between safety and performance, ensuring reliable system operation while effectively improving cooling capacity under poor ventilation conditions.

[0150] By precisely setting compensation value gradients, the air conditioner can implement differentiated protection for different degrees of heat dissipation degradation.

[0151] Based on the compressor's short-term tolerance characteristics, it ensures that all increases in compensation values ​​remain within the equipment's safe operating range. The tiered adjustment mechanism enables the air conditioner to automatically match actual operating conditions, avoiding overcompensation or insufficient protection.

[0152] The dynamic adjustment function monitors temperature change trends in real time and intelligently adjusts the compensation intensity to ensure both rapid response and stability of the air conditioner.

[0153] In some embodiments, such as Figure 7 As shown, when the air conditioner is determined to be installed in a poorly ventilated environment, the compressor's operating frequency is increased according to the preset temperature difference range between the outdoor ambient temperature T1 and the outdoor ambient temperature T2.

[0154] In poorly ventilated installation environments, the refrigerant circulation volume is increased by increasing the operating frequency of compressor 2, thus compensating for the decrease in heat exchange efficiency caused by poor ventilation.

[0155] Specifically, when an air conditioner is in cooling mode, its highest operating pressure is the condensing pressure, which corresponds to the condensing temperature.

[0156] The outdoor coil temperature is used to determine the high-pressure level, thereby constraining the operating frequency of compressor 2 under different operating conditions. The maximum operating pressure of the air conditioner when compressor 2 is running is determined based on a certain operating time. The shorter the cumulative operating time, the higher the maximum allowable pressure of the air conditioner by compressor 2.

[0157] Based on the preset temperature difference range between outdoor ambient temperature T1 and outdoor ambient temperature T2, the protection value for outdoor coil temperature can be increased accordingly, and the upper limit of allowable condensing pressure can be increased accordingly.

[0158] Within the permissible upper limit of condensing pressure, controller 5 can increase the operating frequency of compressor 2.

[0159] In some embodiments, the operating frequency of compressor 2 increases as the compensation value for the increase of the outdoor coil temperature protection value increases.

[0160] Establish a positive proportional relationship between the operating frequency of compressor 2 and the protection value compensation amount to achieve dynamic load matching, ensuring that the air conditioner can improve cooling capacity and prevent the system from overheating in extreme environments.

[0161] In some embodiments, after adjusting the protection value of the outdoor coil temperature, the rate of change of the temperature of the refrigerant gas delivered by the compressor 2 is obtained. If the rate of change of the temperature of the refrigerant gas delivered by the compressor 2 exceeds a preset safety threshold, the operating frequency of the compressor 2 is reduced.

[0162] By monitoring the rate of change of refrigerant temperature in real time, a rapid-response safety feedback mechanism is established during the dynamic adjustment process to prevent potential overheating risks caused by the increase of protection values.

[0163] If the operating frequency of compressor 2 increases rapidly after the protection value is raised, the refrigerant temperature may rise sharply. Even if the current temperature has not reached the new protection value, there is still a risk of overheating.

[0164] When the rate of change of the refrigerant gas temperature delivered by compressor 2 exceeds the preset safety threshold, the operating frequency of compressor 2 is immediately reduced while the fan is kept running at high speed, which can reduce the peak refrigerant temperature and improve system stability.

[0165] In some embodiments, such as Figure 8 As shown, when the air conditioner is determined to be installed in a poorly ventilated environment, the speed of fan 1 is increased according to the preset temperature difference range of the difference between outdoor ambient temperature T1 and outdoor ambient temperature T2.

[0166] In poorly ventilated environments, the forced convection cooling effect is enhanced by the graded linkage between the speed of fan 1 and the preset temperature difference range between outdoor ambient temperature T1 and outdoor ambient temperature T2. This, combined with the adjustment of protection values, creates a synergistic effect and further improves the system's resilience.

[0167] Increasing the speed of fan 1 can increase the air velocity on the surface of the outdoor coil and improve the heat transfer coefficient.

[0168] Specifically, the degree of influence of the grille environment on the air conditioner is determined based on the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2.

[0169] When the grid environment has a relatively small impact on the air conditioner, the speed of fan 1 is increased by the first compensation value accordingly.

[0170] For example, if the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 is greater than or equal to 4 degrees Celsius and less than 5 degrees Celsius, the speed of fan 1 will be increased by 50 to 100 revolutions as a compensation value.

[0171] When the influence of the grille environment on the air conditioner is moderate, the speed of fan 1 will be increased by a second compensation value.

[0172] For example, if the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 is greater than or equal to 5 degrees Celsius and less than 6 degrees Celsius, the speed of fan 1 will be increased by 150 to 200 revolutions per minute as a compensation value.

[0173] When the grid environment has a significant impact on the air conditioner, the speed of fan 1 will be increased by a third compensation value.

[0174] For example, if the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 is greater than or equal to 6 degrees Celsius, the speed of fan 1 will be increased by a compensation value of 300 revolutions.

[0175] This application also provides an air conditioner control method. Figure 9 A flowchart of an air conditioner control method provided in an embodiment of this application.

[0176] like Figure 9 As shown, the air conditioner control method includes: When the air conditioner starts cooling, it starts running fan 1 and detects the outdoor ambient temperature T2 through ambient temperature sensor 3. The outdoor coil temperature is detected by outdoor coil temperature sensor 4; After the first time period, compressor 2 is started and running. The outdoor ambient temperature T1 during the second time period of compressor 2 operation is detected by ambient temperature sensor 3. Determine whether the air conditioner is installed in a poorly ventilated environment based on the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2. If the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 is greater than the third threshold, it is determined that the air conditioner is installed in a poorly ventilated environment, and the protection value of the outdoor coil temperature is adjusted. Otherwise, it is determined that the air conditioner is not installed in a poorly ventilated environment, and the protection value of the outdoor coil temperature is not adjusted.

[0177] Through the coordinated detection of ambient temperature sensor 3 and outdoor coil temperature sensor 4, intelligent identification of the air conditioner installation environment is achieved.

[0178] By first starting fan 1 to obtain initial environmental parameters, and then starting compressor 2 to detect operating parameters, a time-sequential environmental status detection process was established.

[0179] The temperature difference judgment logic is simple and reliable, and can accurately identify poor ventilation characteristics, while the dynamic protection value adjustment ensures that the identification results can be transformed into effective control actions.

[0180] It achieves a complete closed loop from environmental detection to parameter adjustment, and can automatically adapt to different installation environments without manual intervention, significantly improving the technical requirements for the air conditioner's self-adaptability under complex operating conditions.

[0181] In addition, combined Figure 2 The air conditioner described in this application is an embodiment of the present application. Figure 10 This is a hardware configuration diagram of the controller 5 according to an embodiment of this application.

[0182] The controller 5 of the air conditioner may include a processor 81 and a memory 82 storing computer program instructions.

[0183] Specifically, the processor 81 may include a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0184] The memory 82 may include a large-capacity memory for data or instructions.

[0185] In some embodiments, the air conditioner controller 5 may further include a communication interface 83 and a bus 80. For example, Figure 10 As shown, the processor 81, memory 82, and communication interface 83 are connected through bus 80 and complete communication with each other.

[0186] The communication interface 83 is used to enable communication between modules, devices, units and / or equipment in the embodiments of this application.

[0187] Bus 80 includes hardware, software, or both, which couples the components of the air conditioner together.

[0188] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.

[0189] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An air conditioner, characterized in that, include: Outdoor coil, which is used for heat exchange with the outside air; A fan is used to drive airflow through the outdoor coil; A compressor is used to compress refrigerant gas and deliver the refrigerant gas to the outdoor coil for circulation. An ambient temperature sensor is used to detect the outdoor ambient temperature. Outdoor coil temperature sensor, used to detect the temperature of outdoor coil; The controller is electrically connected to the compressor, the fan, the ambient temperature sensor, and the outdoor coil temperature sensor; the controller is configured to: After the air conditioner starts cooling, the fan is controlled to operate, and the outdoor ambient temperature T2 and the outdoor coil temperature are obtained. After the first time period, the compressor is controlled to run, and the outdoor ambient temperature T1 during the second time period of compressor operation is obtained; Whether the air conditioner is in a high-temperature environment is determined based on whether the outdoor ambient temperature T1 is greater than a first threshold. If the outdoor ambient temperature T1 is greater than the first threshold, the air conditioner is determined to be in a high-temperature environment, and whether the air conditioner is in a grid environment is determined based on whether the difference between the outdoor coil temperature and the outdoor ambient temperature T2 is less than the second threshold. If the difference between the outdoor coil temperature and the outdoor ambient temperature T2 is less than the second threshold, the air conditioner is determined to be in a grille environment, and further, the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 is used to determine whether the air conditioner is in a poorly ventilated installation environment. If the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 is greater than the third threshold, it is determined that the air conditioner is installed in a poorly ventilated environment, and the protection value of the outdoor coil temperature is adjusted. Otherwise, it is determined that the air conditioner is not installed in a poorly ventilated environment, and the protection value of the outdoor coil temperature is not adjusted.

2. The air conditioner according to claim 1, characterized in that, The controller is also configured to: When it is determined that the air conditioner is installed in a poorly ventilated environment, the protection value of the outdoor coil temperature is increased by a corresponding compensation value according to the preset temperature difference range to which the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 belongs. Different preset temperature difference ranges correspond to different compensation values.

3. The air conditioner according to claim 2, characterized in that, The controller is also configured to: The compensation value increases as the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 falls within a preset temperature difference range.

4. The air conditioner according to claim 3, characterized in that, The controller is also configured to: When it is determined that the air conditioner is installed in a poorly ventilated environment, the operating frequency of the compressor is increased according to the preset temperature difference range to which the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 belongs.

5. The air conditioner according to claim 4, characterized in that, The controller is also configured to: The operating frequency of the compressor increases as the compensation value for the increase of the protection value of the outdoor coil temperature increases.

6. The air conditioner according to claim 4, characterized in that, The controller is also configured to: After adjusting the protection value of the outdoor coil temperature, the rate of change of the temperature of the refrigerant gas delivered by the compressor is obtained. If the rate of change of the temperature of the refrigerant gas delivered by the compressor exceeds a preset safety threshold, the operating frequency of the compressor is reduced.

7. The air conditioner according to claim 1, characterized in that, The controller is also configured to: When it is determined that the air conditioner is installed in a poorly ventilated environment, the fan speed is increased according to the preset temperature difference range to which the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 belongs.

8. An air conditioner control method, characterized in that, include: When the air conditioner starts cooling, the fan starts running and the outdoor ambient temperature T2 is detected by the ambient temperature sensor. The outdoor coil temperature is detected by an outdoor coil temperature sensor; After the first time period, the compressor is started and running, and the outdoor ambient temperature T1 during the second time period of compressor operation is detected by the ambient temperature sensor. The air conditioner is determined to be in a high-temperature environment based on whether the outdoor ambient temperature T1 is greater than a first threshold. If the outdoor ambient temperature T1 is greater than the first threshold, the air conditioner is determined to be in a high-temperature environment. The air conditioner is also determined to be in a grid environment based on whether the difference between the outdoor coil temperature and the outdoor ambient temperature T2 is less than a second threshold. If the difference between the outdoor coil temperature and the outdoor ambient temperature T2 is less than the second threshold, the air conditioner is determined to be in a grille environment, and further, the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 is used to determine whether the air conditioner is in a poorly ventilated installation environment. If the difference between the outdoor ambient temperature T1 and the outdoor ambient temperature T2 is greater than the third threshold, it is determined that the air conditioner is installed in a poorly ventilated environment, and the protection value of the outdoor coil temperature is adjusted. Otherwise, it is determined that the air conditioner is not installed in a poorly ventilated environment, and the protection value of the outdoor coil temperature is not adjusted.

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