Air conditioner control processing method and device in low-temperature refrigeration mode

Abstract

The invention provides an air conditioner control processing method and device in a low-temperature refrigeration mode, and the method comprises the steps: obtaining a current actual indoor environment temperature and an actual evaporation temperature corresponding to the air conditioner under the condition that the air conditioner is detected to enter the low-temperature refrigeration mode; determining a target evaporation temperature corresponding to the air conditioner according to the current actual indoor environment temperature; and based on the target evaporation temperature and the actual evaporation temperature, the operation frequency of a compressor in the air conditioner is controlled, and under the condition that the operation frequency reaches the frequency limiting condition, the air conditioner is started. And the opening degree of an electronic expansion valve of an outdoor unit of the air conditioner is controlled based on the target exhaust temperature, and the rotating speed of an outdoor fan of the air conditioner is adjusted to the target rotating speed based on the current actual outdoor environment temperature, so that the air suction superheat degree of the air conditioner is adjusted to the target air suction superheat degree. According to the method provided by the invention, the operation stability and the refrigeration effect of the air conditioner in the low-temperature refrigeration mode can be effectively improved, so that the use experience of a user is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning equipment, and particularly to a control processing method and device for an air conditioner in a low-temperature refrigeration mode. In addition, the present invention also relates to an air conditioner and a non-transitory computer-readable storage medium. Background Art

[0002] In recent years, with the continuous development of Internet technology, intelligent air conditioners have been increasingly widely used in people's daily lives. To improve the refrigeration effect of air conditioners in low-temperature environments, for example, when the temperature is below 12°C, the refrigeration mode is still required, and even when the temperature is -40°C, the air conditioner needs to cool down. In this scenario, solving the reliability of low-temperature refrigeration of air conditioners and improving the refrigeration effect in ultra-low-temperature situations have become the focus of current research by technicians. However, in the prior art, the control efficiency of the low-temperature refrigeration mode of air conditioners is relatively low, and the stability of refrigeration operation cannot be guaranteed, resulting in poor refrigeration effects. Therefore, how to provide a more stable control processing scheme for air conditioners in the low-temperature refrigeration mode has become an urgent problem to be solved. Summary of the Invention

[0003] The present invention provides a control processing method for an air conditioner in a low-temperature refrigeration mode, so as to solve the defect that the control scheme of the low-temperature refrigeration mode of the air conditioner in the prior art has high limitations, resulting in poor stability of refrigeration operation and poor refrigeration effect.

[0004] The present invention provides a control processing method for an air conditioner in a low-temperature refrigeration mode, including: When it is detected that the air conditioner enters the low-temperature refrigeration mode, obtain the current actual indoor environmental temperature and the actual evaporation temperature corresponding to the air conditioner, and determine the target evaporation temperature corresponding to the air conditioner according to the current actual indoor environmental temperature; Based on the target evaporation temperature and the actual evaporation temperature, control the operating frequency of the compressor in the air conditioner, and when the operating frequency reaches the frequency limit condition, control the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner based on the target exhaust temperature and adjust the rotation speed of the outdoor fan of the air conditioner to the target rotation speed based on the current actual outdoor environmental temperature, so as to adjust the suction superheat degree of the air conditioner to the target suction superheat degree.

[0005] Further, the controlling the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature specifically includes: Compare the target evaporation temperature and the actual evaporation temperature to determine the difference between the target evaporation temperature and the actual evaporation temperature; Determine the correction frequency of the compressor in the air conditioner according to the difference, and control the operating frequency of the compressor in the air conditioner based on the correction frequency.

[0006] Further, before controlling the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature, the following steps are also included: Obtain the current actual outdoor ambient temperature and the current exhaust gas temperature corresponding to the air conditioner; wherein, the current actual outdoor ambient temperature is the sum of the measured outdoor ambient temperature and the outdoor ambient temperature compensation value; Based on the current actual outdoor ambient temperature and a preset first correspondence, determine the target exhaust gas temperature, and determine a target exhaust gas temperature determination condition according to the target exhaust gas temperature; wherein, the first correspondence includes the correspondence between each actual outdoor ambient temperature and each target exhaust gas temperature; When the operating frequency reaches the frequency limit condition, controlling the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner based on the target exhaust gas temperature specifically includes: When the operating frequency of the compressor in the air conditioner reaches the preset frequency upper limit, frequency lower limit, or when the current operating frequency of the compressor in the air conditioner continuously operates for a target time threshold, perform a comparison and analysis based on the target exhaust gas temperature determination condition and the current exhaust gas temperature to obtain a comparison and analysis result; control the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner according to the comparison and analysis result.

[0007] Further, after controlling the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature, the following steps are also included: When it is detected that the air conditioner enters the low-temperature refrigeration mode, obtain the current actual outdoor ambient temperature corresponding to the air conditioner, and determine the frequency upper limit and frequency lower limit of the operating frequency of the compressor in the air conditioner according to the current actual outdoor ambient temperature and a preset second correspondence; wherein, the second correspondence includes the correspondence between each outdoor ambient temperature and each frequency upper limit and frequency lower limit; Compare the operating frequency of the compressor in the air conditioner with the frequency upper limit and frequency lower limit of the operating frequency of the compressor in the air conditioner to determine whether the operating frequency of the compressor in the air conditioner reaches the preset frequency upper limit or frequency lower limit.

[0008] Further, adjusting the rotational speed of the outdoor fan of the air conditioner to a target rotational speed based on the current actual outdoor ambient temperature specifically includes: performing a comparison and analysis based on the current actual outdoor ambient temperature and an outdoor fan rotational speed determination condition to obtain a comparison and analysis result; controlling the rotational speed of the outdoor fan of the air conditioner based on the comparison and analysis result to adjust the rotational speed of the outdoor fan of the air conditioner to the target rotational speed.

[0009] Further, after adjusting the rotational speed of the outdoor fan of the air conditioner to the target rotational speed, the following steps are also included: Obtain the current external coil temperature of the air conditioner and the external coil temperature before the target time; based on the current external coil temperature and the external coil temperature before the target time, determine whether to perform an operation for protecting the air conditioner's outdoor fan against excessively low external coil temperature.

[0010] Further, in the case where it is detected that the air conditioner enters the low-temperature refrigeration mode, before obtaining the current actual indoor environmental temperature and the actual evaporation temperature corresponding to the air conditioner, the following step is also included: obtain the current actual outdoor environmental temperature corresponding to the air conditioner; Compare and analyze the current actual outdoor environmental temperature with the low-temperature refrigeration mode entry condition. If it is detected that the actual outdoor environmental temperature meets the low-temperature refrigeration mode entry condition within a continuous target time threshold, then determine that the air conditioner enters the low-temperature refrigeration mode.

[0011] The present invention also provides an air conditioner control processing device in the low-temperature refrigeration mode, including: An evaporation temperature determination unit, configured to, in the case where it is detected that the air conditioner enters the low-temperature refrigeration mode, obtain the current actual indoor environmental temperature and the actual evaporation temperature corresponding to the air conditioner, and determine the target evaporation temperature corresponding to the air conditioner according to the current actual indoor environmental temperature; A low-temperature refrigeration control processing unit, configured to control the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature, and in the case where the operating frequency reaches the frequency limit condition, control the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner based on the target exhaust temperature and adjust the rotational speed of the outdoor fan of the air conditioner to the target rotational speed based on the current actual outdoor environmental temperature, so as to adjust the suction superheat degree of the air conditioner to the target suction superheat degree.

[0012] Further, the low-temperature refrigeration control processing unit is specifically configured to: Compare the target evaporation temperature and the actual evaporation temperature, and determine the difference between the target evaporation temperature and the actual evaporation temperature; Determine the corrected frequency of the compressor in the air conditioner according to the difference, and control the operating frequency of the compressor in the air conditioner based on the corrected frequency.

[0013] Further, before controlling the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature, the following step is also included: A target exhaust temperature determination condition unit, configured to: Obtain the current actual outdoor ambient temperature and the current exhaust temperature corresponding to the air conditioner; wherein, the current actual outdoor ambient temperature is the sum of the measured outdoor ambient temperature and the outdoor ambient temperature compensation value; Based on the current actual outdoor ambient temperature and a preset first correspondence, determine the target exhaust temperature, and determine a target exhaust temperature determination condition according to the target exhaust temperature; wherein, the first correspondence includes the correspondence between each actual outdoor ambient temperature and each target exhaust temperature; The low-temperature refrigeration control processing unit is specifically used for: When the operating frequency of the compressor in the air conditioner reaches the preset frequency upper limit, frequency lower limit, or the current operating frequency of the compressor in the air conditioner continues to operate for a target time threshold, perform a comparison and analysis based on the target exhaust temperature determination condition and the current exhaust temperature to obtain a comparison and analysis result; control the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner according to the comparison and analysis result.

[0014] Further, after controlling the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature, it further includes: The operating frequency detection and judgment unit is used for: When it is detected that the air conditioner enters the low-temperature refrigeration mode, obtain the current actual outdoor ambient temperature corresponding to the air conditioner, and determine the frequency upper limit and frequency lower limit of the operating frequency of the compressor in the air conditioner according to the current actual outdoor ambient temperature and a preset second correspondence; wherein, the second correspondence includes the correspondence between each outdoor ambient temperature and each frequency upper limit and frequency lower limit; Compare the operating frequency of the compressor in the air conditioner with the frequency upper limit and frequency lower limit of the operating frequency of the compressor in the air conditioner respectively to determine whether the operating frequency of the compressor in the air conditioner reaches the preset frequency upper limit or frequency lower limit.

[0015] Further, the low-temperature refrigeration control processing unit is specifically used for: perform a comparison and analysis based on the current actual outdoor ambient temperature and the outdoor fan speed determination condition to obtain a comparison and analysis result; control the speed of the outdoor fan of the air conditioner based on the comparison and analysis result to adjust the speed of the outdoor fan of the air conditioner to the target speed.

[0016] Further, after adjusting the speed of the outdoor fan of the air conditioner to the target speed, it further includes: the outer coil temperature too low protection unit is used for: Obtain the current external coil temperature of the air conditioner and the external coil temperature before the target time; determine whether to perform an operation for protecting the external coil temperature from being too low on the outdoor fan of the air conditioner based on the current external coil temperature and the external coil temperature before the target time.

[0017] Further, before obtaining the current actual indoor environmental temperature and the actual evaporation temperature corresponding to the air conditioner when it is detected that the air conditioner enters the low-temperature refrigeration mode, it further includes: A low-temperature refrigeration mode determination unit for: Obtain the current actual outdoor environmental temperature corresponding to the air conditioner; Compare and analyze the current actual outdoor environmental temperature with the low-temperature refrigeration mode entry condition. If it is detected that the actual outdoor environmental temperature meets the low-temperature refrigeration mode entry condition within a continuous target time threshold, it is determined that the air conditioner enters the low-temperature refrigeration mode.

[0018] The present invention also provides an air conditioner, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the air conditioner control processing method in the low-temperature refrigeration mode as described in any one of the above.

[0019] The present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the air conditioner control processing method in the low-temperature refrigeration mode as described in any one of the above.

[0020] The air conditioner control processing method in the low-temperature refrigeration mode provided by the present invention, when it is detected that the air conditioner enters the low-temperature refrigeration mode, obtains the current actual indoor environmental temperature and the actual evaporation temperature corresponding to the air conditioner, determines the target evaporation temperature corresponding to the air conditioner according to the current actual indoor environmental temperature, controls the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature, and when the operating frequency reaches the frequency limit condition, controls the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner based on the target exhaust temperature and adjusts the rotational speed of the outdoor fan of the air conditioner to the target rotational speed based on the current actual outdoor environmental temperature, so as to adjust the suction superheat of the air conditioner to the target suction superheat. It can effectively improve the stability and refrigeration effect of the air conditioner operation in the low-temperature refrigeration mode, thereby greatly improving the user experience. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic flowchart of the air conditioner control processing method in the low-temperature refrigeration mode provided by the present invention.

[0023] Figure 2 It is a schematic flowchart of the protection against too low outer coil temperature provided by the present invention.

[0024] Figure 3 It is a schematic structural diagram of the air conditioner control processing device in the low-temperature refrigeration mode provided by the present invention.

[0025] Figure 4 It is a schematic structural diagram of the electronic device provided by the present invention. Detailed implementation manners

[0026] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention with reference to the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0027] The following Figures 1-4 describes the air conditioner control processing method and device in the low-temperature refrigeration mode of the present invention, and details its embodiments.

[0028] The following details the embodiments based on the air conditioner control processing method in the low-temperature refrigeration mode described in the present invention. As Figure 1 shown, it is a schematic flowchart of the air conditioner control processing method in the low-temperature refrigeration mode provided by the present invention, and the specific implementation process includes the following steps: Step 101: When it is detected that the air conditioner enters the low-temperature refrigeration mode, obtain the current actual indoor environmental temperature and the actual evaporation temperature corresponding to the air conditioner, and determine the target evaporation temperature corresponding to the air conditioner according to the current actual indoor environmental temperature.

[0029] In an embodiment of the present invention, when it is detected that the air conditioner enters the low-temperature refrigeration mode, before obtaining the current actual indoor ambient temperature and the actual evaporation temperature corresponding to the air conditioner, it is necessary to first obtain the current actual outdoor ambient temperature corresponding to the air conditioner, compare and analyze the current actual outdoor ambient temperature with the low-temperature refrigeration mode entry condition. If it is detected that the actual outdoor ambient temperature meets the low-temperature refrigeration mode entry condition within a continuous target time threshold, it is determined that the air conditioner enters the low-temperature refrigeration mode.

[0030] Specifically, the low-temperature refrigeration mode entry condition may be that after it is detected that the current actual outdoor ambient temperature TAO is less than or equal to the first target temperature value (TAO ≤ 12°C) within a continuous target time threshold (such as 1 minute), it is determined that the low-temperature refrigeration mode entry condition is met and the low-temperature refrigeration mode is entered. When the current actual outdoor ambient temperature is greater than the second target temperature value (such as TAO > 14°C) (with a 2°C hysteresis, where the hysteresis refers to the temperature fluctuation error range), the conventional refrigeration mode is entered.

[0031] Step 102: Based on the target evaporation temperature and the actual evaporation temperature, control the operating frequency of the compressor in the air conditioner. When the operating frequency reaches the frequency limit condition, control the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner based on the target exhaust temperature and adjust the rotational speed of the outdoor fan of the air conditioner to the target rotational speed based on the current actual outdoor ambient temperature, so as to adjust the suction superheat of the air conditioner to the target suction superheat.

[0032] In an embodiment of the present invention, before controlling the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature, it is necessary to first obtain the current actual outdoor ambient temperature and the current exhaust temperature corresponding to the air conditioner. Among them, the current actual outdoor ambient temperature is the sum of the measured outdoor ambient temperature and the outdoor ambient temperature compensation value. Furthermore, based on the current actual outdoor ambient temperature and a preset first correspondence relationship, the target exhaust temperature is determined, and the target exhaust temperature determination condition is determined according to the target exhaust temperature. Among them, the first correspondence relationship includes the correspondence relationship between each actual outdoor ambient temperature and each target exhaust temperature.

[0033] In an embodiment of the present invention, when controlling the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature, it is necessary to compare the target evaporation temperature and the actual evaporation temperature to determine the difference between the target evaporation temperature and the actual evaporation temperature, determine the corrected frequency of the compressor in the air conditioner according to the difference, and control the operating frequency of the compressor in the air conditioner based on the corrected frequency. Wherein, the target evaporation temperature is the target value of the indoor coil temperature of the air conditioner. Further, after controlling the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature, it further includes: when it is detected that the air conditioner enters the low-temperature refrigeration mode, obtaining the current actual outdoor ambient temperature corresponding to the air conditioner, and determining the upper limit and lower limit of the operating frequency of the compressor in the air conditioner according to the current actual outdoor ambient temperature and a preset second correspondence. Wherein, the second correspondence includes the correspondence between each outdoor ambient temperature and each upper limit and lower limit of the frequency. The actual evaporation temperature is the actual value of the indoor coil temperature of the air conditioner. Compare the operating frequency of the compressor in the air conditioner with the upper limit and lower limit of the operating frequency of the compressor in the air conditioner respectively to determine whether the operating frequency of the compressor in the air conditioner reaches the preset upper limit or lower limit of the frequency. Wherein, the lower limit of the frequency can be a value preset according to the actual outdoor ambient temperature.

[0034] Part of the content included in the second correspondence is shown in the following table:

[0035] It should be noted that in the present invention, the compressor frequency is controlled by the target evaporation temperature (target value of the indoor coil temperature) TMS / ETS, and the frequency is adjusted according to this target evaporation temperature. The rise and fall of the compressor frequency are controlled so that the actual evaporation temperature TM / ET reaches the target evaporation temperature TMS / ETS. When the actual outdoor ambient temperature Tao < -45°C, the dead band is 2°C (±1°C is not adjusted), the compressor stops, and the outdoor fan stops. This enables the suction superheat compensation of the low-temperature refrigeration compressor to ensure the suction superheat, thereby avoiding serious liquid return. The adjustment interval time of the operating frequency of the compressor can be 45s. In addition, it should be noted that in the low-temperature refrigeration mode of the present invention, in order to maintain the stable operation of the air conditioner, ice formation and frosting on the indoor unit are avoided as much as possible, and the suction and discharge pressures are increased. The selection of gentle breeze and low wind on the indoor unit is cancelled, and the lowest wind speed of the indoor unit is medium speed. If the user sets it to low speed, it will default to operate at medium speed. The setting of the target evaporation temperature TMS / ETS can be selected according to the indoor ambient temperature, that is, the following table can be used for matching when determining the target evaporation temperature corresponding to the air conditioner according to the current actual indoor ambient temperature:

[0036] When comparing the target evaporation temperature and the actual evaporation temperature, determining the difference between the target evaporation temperature and the actual evaporation temperature, determining the correction frequency of the compressor in the air conditioner according to the difference, and controlling the operating frequency of the compressor in the air conditioner based on the correction frequency, if the actual evaporation temperature TM is higher than the target evaporation temperature TMS, then control the frequency increase. Each time, the correction is made through the difference of TM - TMS (that is, determining the correction frequency of the compressor in the air conditioner according to the difference, and controlling the operating frequency of the compressor in the air conditioner based on the correction frequency), and the number of correction frequencies is the algebraic value of TM - TMS (with positive and negative values). For example, if the current target evaporation temperature is 8 and the actual evaporation temperature TM is 6 degrees, then the correction frequency is -2, that is, the frequency is decreased by 2HZ on the current operating frequency of the compressor. If the target evaporation temperature is 6 and the actual evaporation temperature is 8, then the correction frequency is 2, and the frequency is increased by 2HZ on the basis of the current operating frequency of the compressor. If the frequency cannot be increased due to frequency limitation after this correction is completed, then when the next correction is made, the frequency does not need to be accumulated, and the frequency is still increased or decreased on the current target frequency according to the current correction frequency. The upper and lower limits of the frequency are restricted by the aforementioned regulations.

[0037] In addition, when the operating frequency reaches the frequency limitation condition, the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner is controlled based on the target exhaust temperature. The corresponding specific implementation process includes: when the operating frequency of the compressor in the air conditioner reaches the preset frequency upper limit, frequency lower limit, or the current operating frequency of the compressor in the air conditioner continues to run for the target time threshold, comparing and analyzing the target exhaust temperature determination condition and the current exhaust temperature to obtain a comparison and analysis result; controlling the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner according to the comparison and analysis result. That is, when the operating frequency of the compressor in the air conditioner reaches the preset frequency limitation condition or the current operating frequency of the compressor in the air conditioner continues to run for the target time threshold, controlling the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner based on the detected target exhaust temperature, and controlling the rotation speed of the outdoor fan of the air conditioner based on the current actual outdoor environmental temperature corresponding to the air conditioner; wherein, the target exhaust temperature is determined according to the current actual outdoor environmental temperature corresponding to the air conditioner; the electronic expansion valve is an electronic expansion valve located between the condenser and the stop valve of the air conditioner, and is used for controlling the air-liquid conversion throttling of the air conditioner.

[0038] For example, during the control process of the electronic expansion valve, after the soft start process is completed, when the operating frequency of the compressor reaches the upper limit of the limit frequency corresponding to the current outdoor ambient temperature or other frequency limit conditions (such as coil, exhaust, current, etc. frequency limits), that is, the preset frequency limit conditions are reached; or, after the compressor frequency has been stable at the current operating frequency for 10 minutes (hysteresis ±1 Hz), that is, when the current operating frequency continues to run for the target time threshold, the adjustment of the electronic expansion valve begins to control the opening of the electronic expansion valve according to the target exhaust temperature Tam. The specific target exhaust temperature determination conditions are as follows:

[0039] After the air conditioner enters the low-temperature refrigeration mode, the current actual outdoor ambient temperature Tao = measured outdoor ambient temperature + outdoor ambient temperature compensation value. Based on the comparison and analysis of the target exhaust temperature determination conditions and the current exhaust temperature, a comparison and analysis result is obtained; the opening of the electronic expansion valve of the outdoor unit of the air conditioner is controlled according to the comparison and analysis result. The target exhaust temperature determination conditions may include: 1. When Td < Tam - 2, the electronic expansion valve closes slowly (-1 / 60 second); 2. When Tam + 2 < Td ≤ Tam + 5, the electronic expansion valve opens (+1 / 30 second); 3. When Td > Tam + 5, the electronic expansion valve opens (+1 / 10 second); 4. When Tam - 2 ≤ Td ≤ Tam + 2, the electronic expansion valve maintains the current opening. It should be noted that Td is the current exhaust temperature and Tam is the target exhaust temperature. During the adjustment process of the electronic expansion valve, the minimum opening limit of the electronic expansion valve is effective.

[0040] In addition, adjusting the rotation speed of the outdoor fan of the air conditioner to the target rotation speed based on the current actual outdoor ambient temperature, the corresponding specific implementation process includes: comparing and analyzing based on the current actual outdoor ambient temperature and the determination conditions of the outdoor fan rotation speed to obtain a comparison and analysis result; controlling the rotation speed of the outdoor fan of the air conditioner based on the comparison and analysis result to adjust the rotation speed of the outdoor fan of the air conditioner to the target rotation speed. Specifically, in the control process of the outdoor fan of the present invention, the entry and operation process of the outdoor fan includes: when cooling at low temperature, the outdoor fan operates at a fixed rotation speed, and both the entry and operation are at a fixed rotation speed divided according to the outdoor ambient temperature, and the wind speed operates at a fixed rotation speed (to prevent the wind speed from fluctuating at the temperature point, the outdoor ambient temperature can be judged once every 20 s). The determination conditions of the outdoor fan rotation speed may include that when the outdoor ambient temperature is greater than 0 °C and less than or equal to 12 °C, the fixed rotation speed is 400; when the outdoor ambient temperature is greater than -9 °C and less than or equal to 0 °C, the fixed rotation speed is 300; when the outdoor ambient temperature is greater than -20 °C and less than or equal to -9 °C, the fixed rotation speed is 250; when the outdoor ambient temperature is greater than -30 °C and less than or equal to -20 °C, the fixed rotation speed is 220; when the outdoor ambient temperature is greater than -40 °C and less than or equal to -30 °C, the fixed rotation speed is 200; when the outdoor ambient temperature is less than or equal to -40 °C, the fixed rotation speed is 200; during the operation process, when 12 °C < Tao <= 14 °C, no adjustment is made and the previous state is defaulted.

[0041] Further, after adjusting the rotation speed of the outdoor fan of the air conditioner to the target rotation speed, it further includes: protecting against the too low temperature of the cooling outer disk of the outdoor fan of the air conditioner. Specifically, it includes: obtaining the current outer coil temperature of the air conditioner and the outer coil temperature before the target time; determining whether to perform an operation to protect against the too low temperature of the outer coil of the outdoor fan of the air conditioner based on the current outer coil temperature and the outer coil temperature before the target time. The current outer coil temperature is Tc, and the outer coil temperature before the target time (such as 25 s) can be, for example, Tc 25 s ago: △T = current Tc - Tc 25 s ago Such as Figure 2As shown, after the outdoor fan of the air conditioner is controlled to enter shutdown, if the outdoor fan restoration operation conditions of the air conditioner are met, the outdoor fan of the air conditioner is controlled to a target fixed speed (such as a fixed speed of 250, a fixed speed of 220, etc.); after the outdoor fan of the air conditioner is controlled to the target fixed speed and lasts for a period of time, if the external coil temperature is too low protection operation conditions are met, the outdoor fan of the air conditioner is controlled to enter shutdown. The outdoor fan restoration operation conditions of the air conditioner include △T≥7℃, Tc≥17℃, or the temperature detected by the temperature detection module of the circuit board in the air conditioner>50℃. The external coil temperature is too low protection operation conditions include that after the startup is completed, the outdoor fan lasts for a period of time (such as 20s) and Tc<15℃ and △T<0.5℃, and the temperature detected by the temperature detection module of the circuit board in the air conditioner is <45℃.

[0042] In the process of controlling the operating frequency of the compressor, the present invention controls the operating frequency of the compressor through the target evaporation temperature (target value of the indoor unit coil temperature) TMS / ETS, and the operating frequency is adjusted according to the target evaporation divided by the target evaporation temperature. In the process of adjusting the electronic expansion valve, it is controlled according to the target exhaust temperature Tam, and the opening of the electronic expansion valve is controlled according to the target exhaust temperature. During the entry and operation of the outdoor fan, the outdoor fan runs at a fixed speed in the low-temperature refrigeration mode, and the entry and operation are controlled according to the fixed speed divided by the outdoor ambient temperature. That is, the present invention improves the effect of low-temperature refrigeration by adjusting the outdoor fan speed, compressor frequency and electronic expansion opening logic. In order to maintain the stability of the system, the indoor unit is avoided from freezing and frosting as much as possible, and the suction and exhaust pressure is increased, the compressor suction superheat compensation is performed, the suction superheat is ensured, and the serious liquid return is avoided, thereby satisfying the customer's experience and improving the use experience.

[0043] The air conditioner control processing method under the low-temperature refrigeration mode provided by the present invention obtains the current actual indoor ambient temperature and the actual evaporating temperature corresponding to the air conditioner when detecting that the air conditioner enters the low-temperature refrigeration mode, and determines the target evaporating temperature corresponding to the air conditioner according to the current actual indoor ambient temperature, and controls the operating frequency of the compressor in the air conditioner based on the target evaporating temperature and the actual evaporating temperature, and controls the opening of the electronic expansion valve of the outdoor unit of the air conditioner based on the target exhaust temperature when the operating frequency reaches the frequency limit condition, and adjusts the speed of the outdoor fan of the air conditioner to the target speed based on the current actual outdoor ambient temperature, so as to adjust the suction superheat of the air conditioner to the target suction superheat, which can effectively improve the stability and cooling effect of the air conditioner operation in the low-temperature refrigeration mode, thereby greatly improving the user experience.

[0044] The air conditioner control and processing device in the low-temperature refrigeration mode provided by the present invention will be described below. The air conditioner control and processing device in the low-temperature refrigeration mode described below can be correspondingly referred to the air conditioner control and processing method in the low-temperature refrigeration mode described above. Refer to Figure 3 As shown, it is a schematic structural diagram of the air conditioner control and processing device in the low-temperature refrigeration mode provided by the present invention. The air conditioner control and processing device in the low-temperature refrigeration mode of the present invention specifically includes the following parts: An evaporation temperature determination unit 301, configured to obtain the current actual indoor environmental temperature and the actual evaporation temperature corresponding to the air conditioner when it is detected that the air conditioner enters the low-temperature refrigeration mode, and determine the target evaporation temperature corresponding to the air conditioner according to the current actual indoor environmental temperature; A low-temperature refrigeration control and processing unit 302, configured to control the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature, and when the operating frequency reaches the frequency limit condition, control the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner based on the target exhaust temperature and adjust the rotational speed of the outdoor fan of the air conditioner to the target rotational speed based on the current actual outdoor environmental temperature, so as to adjust the suction superheat degree of the air conditioner to the target suction superheat degree.

[0045] Further, the low-temperature refrigeration control and processing unit is specifically configured to: Compare the target evaporation temperature with the actual evaporation temperature to determine the difference between the target evaporation temperature and the actual evaporation temperature; Determine the correction frequency of the compressor in the air conditioner according to the difference, and control the operating frequency of the compressor in the air conditioner based on the correction frequency.

[0046] Further, before controlling the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature, it further includes: A target exhaust temperature determination condition unit, configured to: Obtain the current actual outdoor environmental temperature and the current exhaust temperature corresponding to the air conditioner; wherein, the current actual outdoor environmental temperature is the sum of the measured outdoor environmental temperature and the outdoor environmental temperature compensation value; Determine the target exhaust temperature based on the current actual outdoor environmental temperature and a preset first correspondence, and determine the target exhaust temperature determination condition according to the target exhaust temperature; wherein, the first correspondence includes the correspondence between each actual outdoor environmental temperature and each target exhaust temperature; The low-temperature refrigeration control and processing unit is specifically configured to: When the operating frequency of the compressor in the air conditioner reaches the preset upper frequency limit, lower frequency limit, or the current operating frequency of the compressor in the air conditioner continues to operate for the target time threshold, a comparison and analysis is performed based on the target exhaust temperature determination condition and the current exhaust temperature to obtain a comparison and analysis result; the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner is controlled according to the comparison and analysis result.

[0047] Further, after controlling the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature, it further includes: An operating frequency detection and judgment unit, configured to: When it is detected that the air conditioner enters the low-temperature refrigeration mode, obtain the current actual outdoor ambient temperature corresponding to the air conditioner, and determine the upper frequency limit and lower frequency limit of the operating frequency of the compressor in the air conditioner according to the current actual outdoor ambient temperature and a preset second correspondence; wherein, the second correspondence includes the correspondence between each outdoor ambient temperature and each upper frequency limit and lower frequency limit; Compare the operating frequency of the compressor in the air conditioner with the upper frequency limit and lower frequency limit of the operating frequency of the compressor in the air conditioner respectively to determine whether the operating frequency of the compressor in the air conditioner reaches the preset upper frequency limit or lower frequency limit.

[0048] Further, the low-temperature refrigeration control processing unit is specifically configured to: perform a comparison and analysis based on the current actual outdoor ambient temperature and the outdoor fan speed determination condition to obtain a comparison and analysis result; control the speed of the outdoor fan of the air conditioner based on the comparison and analysis result to adjust the speed of the outdoor fan of the air conditioner to the target speed.

[0049] Further, after adjusting the speed of the outdoor fan of the air conditioner to the target speed, it further includes: an external coil temperature too low protection unit, configured to: Obtain the current external coil temperature of the air conditioner and the external coil temperature before the target time; determine whether to perform an external coil temperature too low protection operation on the outdoor fan of the air conditioner based on the current external coil temperature and the external coil temperature before the target time.

[0050] Further, before obtaining the current actual indoor ambient temperature and the actual evaporation temperature corresponding to the air conditioner when it is detected that the air conditioner enters the low-temperature refrigeration mode, it further includes: A low-temperature refrigeration mode judgment unit, configured to: Obtain the current actual outdoor ambient temperature corresponding to the air conditioner; Compare and analyze the current actual outdoor environmental temperature with the entry conditions of the low-temperature refrigeration mode. If it is detected that the actual outdoor environmental temperature meets the entry conditions of the low-temperature refrigeration mode within the continuous target time threshold, it is determined that the air conditioner enters the low-temperature refrigeration mode.

[0051] The air conditioner control processing device under the low-temperature refrigeration mode provided by the present invention, when it is detected that the air conditioner enters the low-temperature refrigeration mode, obtains the current actual indoor environmental temperature and the actual evaporation temperature corresponding to the air conditioner, determines the target evaporation temperature corresponding to the air conditioner according to the current actual indoor environmental temperature, controls the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature, and when the operating frequency reaches the frequency limit condition, controls the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner based on the target exhaust temperature and adjusts the rotational speed of the outdoor fan of the air conditioner to the target rotational speed based on the current actual outdoor environmental temperature, so as to adjust the suction superheat of the air conditioner to the target suction superheat. It can effectively improve the stability and refrigeration effect of the air conditioner operation under the low-temperature refrigeration mode, thereby greatly improving the user experience.

[0052] Figure 4 An example of the physical structure diagram of an electronic device is as Figure 4 shown. The electronic device (i.e., the air conditioner) may include: a processor 401, a communication interface 404, a memory 402, and a communication bus 403. Among them, the processor 401, the communication interface 404, and the memory 402 communicate with each other through the communication bus 403. The processor 401 can call the logical instructions in the memory 402 to execute the air conditioner control processing method under the low-temperature refrigeration mode. The method includes: when it is detected that the air conditioner enters the low-temperature refrigeration mode, obtaining the current actual indoor environmental temperature and the actual evaporation temperature corresponding to the air conditioner, and determining the target evaporation temperature corresponding to the air conditioner according to the current actual indoor environmental temperature; controlling the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature, and when the operating frequency reaches the frequency limit condition, controlling the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner based on the target exhaust temperature and adjusting the rotational speed of the outdoor fan of the air conditioner to the target rotational speed based on the current actual outdoor environmental temperature, so as to adjust the suction superheat of the air conditioner to the target suction superheat.

[0053] In addition, when the logical instructions in the above-mentioned memory 402 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs.

[0054] On the other hand, this application also provides a computer program product. The computer program product includes a computer program that can be stored on a computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the air conditioner control processing method in the low-temperature refrigeration mode provided by the above-mentioned various methods. The method includes: when it is detected that the air conditioner enters the low-temperature refrigeration mode, obtaining the current actual indoor environmental temperature and the actual evaporation temperature corresponding to the air conditioner, and determining the target evaporation temperature corresponding to the air conditioner according to the current actual indoor environmental temperature; based on the target evaporation temperature and the actual evaporation temperature, controlling the operating frequency of the compressor in the air conditioner, and when the operating frequency reaches the frequency limit condition, controlling the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner based on the target exhaust temperature and adjusting the rotation speed of the outdoor fan of the air conditioner to the target rotation speed based on the current actual outdoor environmental temperature, so as to adjust the suction superheat degree of the air conditioner to the target suction superheat degree.

[0055] In another aspect, the present application also provides a computer-readable storage medium, the computer-readable storage medium including a stored program, wherein when the program runs, it executes the air conditioner control processing method in the low-temperature refrigeration mode provided by the above-mentioned various methods. The method includes: when it is detected that the air conditioner enters the low-temperature refrigeration mode, obtaining the current actual indoor environmental temperature and the actual evaporation temperature corresponding to the air conditioner, and determining the target evaporation temperature corresponding to the air conditioner according to the current actual indoor environmental temperature; based on the target evaporation temperature and the actual evaporation temperature, controlling the operating frequency of the compressor in the air conditioner, and when the operating frequency reaches the frequency limit condition, controlling the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner based on the target exhaust temperature and adjusting the rotational speed of the outdoor fan of the air conditioner to the target rotational speed based on the current actual outdoor environmental temperature, so as to adjust the suction superheat degree of the air conditioner to the target suction superheat degree.

[0056] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0057] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disc, etc., including several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0058] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of each embodiment of the present application.

Claims

1. An air conditioner control processing method in a low-temperature refrigeration mode, characterized in that, Including: When it is detected that the air conditioner enters the low-temperature refrigeration mode, obtain the current actual indoor environmental temperature and the actual evaporation temperature corresponding to the air conditioner, and determine the target evaporation temperature corresponding to the air conditioner according to the current actual indoor environmental temperature; Based on the target evaporation temperature and the actual evaporation temperature, control the operating frequency of the compressor in the air conditioner, and when the operating frequency reaches the frequency limit condition, control the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner based on the target exhaust temperature and adjust the rotational speed of the outdoor fan of the air conditioner to the target rotational speed based on the current actual outdoor environmental temperature, so as to adjust the suction superheat degree of the air conditioner to the target suction superheat degree.

2. The air conditioner control processing method in the low-temperature refrigeration mode according to claim 1, characterized in that The controlling the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature specifically includes: Compare the target evaporation temperature and the actual evaporation temperature to determine the difference between the target evaporation temperature and the actual evaporation temperature; Determine the correction frequency of the compressor in the air conditioner according to the difference, and control the operating frequency of the compressor in the air conditioner based on the correction frequency.

3. The air conditioner control processing method in the low-temperature refrigeration mode according to claim 1, wherein Before controlling the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature, it further includes: Obtain the current actual outdoor environmental temperature and the current exhaust temperature corresponding to the air conditioner; wherein, the current actual outdoor environmental temperature is the sum of the measured outdoor environmental temperature and the outdoor environmental temperature compensation value; Based on the current actual outdoor environmental temperature and a preset first correspondence, determine the target exhaust temperature, and determine the target exhaust temperature determination condition according to the target exhaust temperature; wherein, the first correspondence includes the correspondence between each actual outdoor environmental temperature and each target exhaust temperature; The controlling the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner based on the target exhaust temperature when the operating frequency reaches the frequency limit condition specifically includes: When the operating frequency of the compressor in the air conditioner reaches the preset frequency upper limit, frequency lower limit or the current operating frequency of the compressor in the air conditioner continuously operates for the target time threshold, perform a comparison and analysis based on the target exhaust temperature determination condition and the current exhaust temperature to obtain a comparison and analysis result; control the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner according to the comparison and analysis result.

4. The air conditioner control processing method in the low-temperature refrigeration mode according to claim 1, characterized in that, After controlling the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature, it further includes: When it is detected that the air conditioner enters the low-temperature refrigeration mode, obtain the current actual outdoor environmental temperature corresponding to the air conditioner, and determine the frequency upper limit and frequency lower limit of the operating frequency of the compressor in the air conditioner according to the current actual outdoor environmental temperature and a preset second correspondence; wherein, the second correspondence includes the correspondence between each outdoor environmental temperature and each frequency upper limit and frequency lower limit; Compare the operating frequency of the compressor in the air conditioner with the upper frequency limit and the lower frequency limit of the operating frequency of the compressor in the air conditioner to determine whether the operating frequency of the compressor in the air conditioner reaches the preset upper frequency limit or lower frequency limit.

5. The air conditioner control processing method in the low-temperature refrigeration mode according to claim 1, characterized in that, Adjusting the rotational speed of the outdoor fan of the air conditioner to the target rotational speed based on the current actual outdoor ambient temperature specifically includes: performing comparison and analysis based on the current actual outdoor ambient temperature and the rotational speed determination condition of the outdoor fan to obtain a comparison and analysis result; controlling the rotational speed of the outdoor fan of the air conditioner based on the comparison and analysis result to adjust the rotational speed of the outdoor fan of the air conditioner to the target rotational speed.

6. The air conditioner control processing method in the low-temperature refrigeration mode according to claim 5, characterized in that, After adjusting the rotational speed of the outdoor fan of the air conditioner to the target rotational speed, it further includes: Obtain the current external coil temperature of the air conditioner and the external coil temperature before the target time; based on the current external coil temperature and the external coil temperature before the target time, determine whether to perform an operation for protecting the air conditioner's outdoor fan against too low external coil temperature.

7. The air conditioner control processing method in the low-temperature refrigeration mode according to claim 1, characterized in that Before obtaining the current actual indoor ambient temperature and the actual evaporation temperature corresponding to the air conditioner when it is detected that the air conditioner enters the low-temperature refrigeration mode, it further includes: Obtain the current actual outdoor ambient temperature corresponding to the air conditioner; Perform comparison and analysis on the current actual outdoor ambient temperature and the low-temperature refrigeration mode entry condition. If it is detected that the actual outdoor ambient temperature meets the low-temperature refrigeration mode entry condition within the continuous target time threshold, it is determined that the air conditioner enters the low-temperature refrigeration mode.

8. An air conditioner control and processing device in a low-temperature refrigeration mode, characterized in that, Includes: An evaporation temperature determination unit, configured to, when it is detected that the air conditioner enters the low-temperature refrigeration mode, obtain the current actual indoor ambient temperature and the actual evaporation temperature corresponding to the air conditioner, and determine the target evaporation temperature corresponding to the air conditioner according to the current actual indoor ambient temperature; A low-temperature refrigeration control processing unit, configured to control the operating frequency of the compressor in the air conditioner based on the target evaporation temperature and the actual evaporation temperature, and when the operating frequency reaches the frequency limit condition, control the opening degree of the electronic expansion valve of the outdoor unit of the air conditioner based on the target exhaust temperature and adjust the rotational speed of the outdoor fan of the air conditioner to the target rotational speed based on the current actual outdoor ambient temperature, so as to adjust the suction superheat of the air conditioner to the target suction superheat.

9. An air conditioner, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the air conditioner control processing method in the low-temperature refrigeration mode as described in any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the air conditioner control processing method in the low-temperature refrigeration mode as described in any one of claims 1 to 7.

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