Defrosting control method and controller for air conditioner, air conditioner and storage medium
By monitoring the temperature of the indoor heat exchanger tubes of the air conditioner and using staged frequency adjustment, speed adjustment, and opening adjustment, the problem of frosting during low-temperature heating of the air conditioner was solved, achieving energy saving, delaying frosting, and improving comfort.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ANHUI ENBOLI ELECTRIC CO LTD
- Filing Date
- 2026-01-23
- Publication Date
- 2026-05-29
AI Technical Summary
Existing air conditioners suffer from severe frost buildup when heating at low temperatures, leading to decreased energy efficiency. Frequent defrosting affects user comfort and increases energy consumption.
By monitoring the temperature of the indoor heat exchanger tubes, a coordinated strategy of phased frequency regulation, speed regulation, opening degree regulation and defrosting control is adopted to switch the operating mode according to different temperature ranges, thereby delaying frosting and improving energy efficiency.
This achieves the goal of reducing defrosting frequency, lowering system energy consumption, and improving thermal comfort and energy efficiency while ensuring comfort.
Smart Images
Figure CN122107520A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of defrosting control technology, and in particular to a defrosting control method and controller for an air conditioner, an air conditioner, and a storage medium. Background Technology
[0002] When air conditioners continuously heat in low winter temperatures, frost will form on the heat exchanger. As the frost worsens, the air conditioner's heat exchange capacity continuously decreases. When the frost reaches a certain level, the air conditioner's heating capacity cannot meet indoor demand, thus requiring defrosting. However, traditional air conditioner defrosting mechanisms still have several shortcomings. First, current defrosting control mechanisms are relatively crude, often using defrosting logic based on fixed time or simple temperature difference thresholds, which cannot accurately judge the actual degree of frost formation, easily leading to over-defrosting or delayed defrosting. Unnecessary defrosting not only wastes energy but also interrupts heating, causing indoor heat to escape to the outside, severely impacting the user experience. Second, to compensate for the performance degradation caused by frost, the system often drives the compressor to maintain extreme high-frequency operation, resulting in high power consumption and further lowering the evaporation temperature, exacerbating frost formation and creating a vicious cycle of "high power consumption → rapid frost → reduced capacity → even higher frequency operation," causing a sharp drop in the overall system energy efficiency ratio (COP). Third, frequent defrosting cycles lead to drastic fluctuations in room temperature, unstable operation, and poor comfort. Summary of the Invention
[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a defrosting control method for an air conditioner, as well as a controller, an air conditioner, and a storage medium. This method can enter different operating modes according to different temperature ranges of the indoor heat exchanger tube temperature, realizing a phased coordinated adjustment strategy that combines frequency regulation, speed regulation, opening degree regulation, and defrosting control. This ensures user comfort while achieving energy saving, delaying frost formation, and timely defrosting.
[0004] In a first aspect, embodiments of this application provide a defrosting control method for an air conditioner, including:
[0005] During the monitoring period, monitoring and processing are performed to obtain ambient temperature parameters, air conditioner system temperature parameters, initial operating status parameters, and control parameters; the ambient temperature parameters include outdoor ambient temperature and indoor ambient temperature; the system temperature parameters include outdoor heat exchanger tube temperature and indoor heat exchanger tube temperature; The temperature comparison result is obtained by comparing the indoor heat exchanger tube temperature with the preset temperature threshold information; the preset temperature threshold information includes: a first inner tube temperature threshold, a second inner tube temperature threshold greater than the first inner tube temperature threshold, and a third inner tube temperature threshold greater than the second inner tube temperature threshold. When the indoor heat exchanger tube temperature is greater than the third inner tube temperature threshold, the system enters a frequency reduction mode based on the indoor heat exchanger tube temperature, the initial operating status parameters, and the control parameters to delay frosting. When the temperature of the indoor heat exchanger tube is greater than the second inner tube temperature threshold and less than or equal to the third inner tube temperature threshold, the speed regulation mode is entered. When the temperature of the indoor heat exchanger tube is greater than the first inner tube temperature threshold and less than or equal to the second inner tube temperature threshold, the opening adjustment mode is entered. When the indoor heat exchanger tube temperature is less than or equal to the first inner tube temperature threshold and the temperature difference between the outdoor heat exchanger tube temperature and the outdoor ambient temperature is less than or equal to the defrosting temperature difference threshold, the defrosting control mode is entered.
[0006] According to some embodiments of this application, the air conditioner includes a compressor; the step of entering a frequency reduction operating mode based on the indoor heat exchanger tube temperature, the initial operating state parameters, and the control parameters includes: The rate of change of the inner tube temperature during the monitoring period is calculated based on the inner heat exchanger tube temperature. The steady-state determination result is obtained by performing steady-state operation determination processing based on the inner tube temperature change rate and the preset determination constant. If the steady-state determination result indicates that the rate of change of the inner tube temperature is greater than the preset determination constant, the initial operating state parameters shall remain unchanged. If the steady-state determination result indicates that the rate of change of the inner tube temperature is less than or equal to the preset determination constant, the target frequency is obtained by frequency adjustment calculation based on the rate of change of the inner tube temperature, the initial operating state parameters and the control parameters, and the operating frequency of the compressor is adjusted to the target frequency. When the compressor is operating at the target frequency, a first cycle determination process is performed based on the recalculated inner pipe temperature change rate or the continuously monitored indoor heat exchanger pipe temperature, and a mode switch is performed based on the obtained first cycle determination result.
[0007] According to some embodiments of this application, the initial operating state parameters include: the compressor initial frequency; the control parameters include the periodic monitoring duration; The step of calculating the target frequency based on the inner tube temperature change rate, the initial operating state parameters, and the control parameters includes: The frequency reduction rate is obtained by calculating the rate of change of the inner tube temperature, the preset proportional constant, and the periodic monitoring duration. The reference frequency is obtained by multiplying the frequency reduction rate, the cumulative number of monitoring cycles, and the initial frequency of the compressor in sequence; the target frequency is obtained by subtracting the reference frequency from the initial frequency of the compressor; wherein the target frequency is greater than or equal to the preset minimum frequency.
[0008] According to some embodiments of this application, the step of calculating the frequency reduction rate based on the inner tube temperature change rate, a preset proportional constant, and the periodic monitoring duration includes: The proportional coefficient is obtained by multiplying the preset proportional constant by the absolute value of the inner tube temperature change rate. The frequency reduction rate is obtained by dividing the product of the proportional coefficient and the absolute value of the inner tube temperature change rate by the periodic monitoring duration.
[0009] According to some embodiments of this application, the air conditioner further includes an indoor fan; The entry into the speed regulation mode includes: After a preset number of monitoring cycles, the target speed gear is determined based on the current speed gear. Control the internal fan to operate at the target speed setting; When the internal fan is operating at the target speed, a second cycle determination is performed based on the continuously monitored indoor heat exchanger tube temperature, and the mode is switched based on the second cycle determination result.
[0010] According to some embodiments of this application, the air conditioner further includes an electronic expansion valve; the entry into the opening adjustment mode includes: The target opening degree at the current moment is obtained by adding the product of the cumulative number of monitoring cycles and the preset opening degree adjustment step constant to the opening degree at the previous moment; wherein the target opening degree is less than or equal to the preset maximum opening degree. Adjust the opening degree of the electronic expansion valve to the target opening degree; When the electronic expansion valve is at the target opening degree, a third cycle judgment process is performed based on the continuously monitored indoor heat exchanger tube temperature, and a mode switch is performed based on the obtained third cycle judgment result.
[0011] According to some embodiments of this application, entering the defrost control mode includes: Stop heating operation and defrost the air conditioner; After the defrosting process is completed, the air conditioner is controlled to operate again based on the initial operating state parameters. The monitoring process and the comparison process are repeated to obtain a new comparison result. Based on the new comparison result, the air conditioner enters the frequency reduction mode, the speed adjustment mode, the opening degree adjustment mode, or the defrosting control mode.
[0012] In a second aspect, embodiments of this application provide a controller, including at least one processor and a memory for communicatively connecting to the at least one processor; the memory stores instructions executable by the at least one processor, which, when executed by the at least one processor, enable the at least one processor to perform a defrosting control method for an air conditioner as described in any of the embodiments of the first aspect.
[0013] Thirdly, embodiments of this application provide an air conditioner, including the controller described in the second aspect embodiment.
[0014] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the defrosting control method for an air conditioner as described in any of the embodiments of the first aspect.
[0015] The embodiments of this application include: During the heating operation of the air conditioner, firstly, monitoring and processing are performed within the monitoring cycle to obtain ambient temperature parameters, air conditioner system temperature parameters, initial operating status parameters, and control parameters. Ambient temperature parameters include outdoor and indoor ambient temperatures; system temperature parameters include outdoor heat exchanger pipe temperature and indoor heat exchanger pipe temperature. Secondly, the indoor heat exchanger pipe temperature is compared with preset temperature thresholds to obtain temperature comparison results. Preset temperature thresholds include: a first inner pipe temperature threshold, a second inner pipe temperature threshold greater than the first inner pipe temperature threshold, and a third inner pipe temperature threshold greater than the second inner pipe temperature threshold. Pipe temperature threshold; the comparison results lay the foundation for selecting different operating modes subsequently; then, when the indoor heat exchanger pipe temperature is greater than the third inner pipe temperature threshold, the frequency reduction operating mode is entered based on the indoor heat exchanger pipe temperature, initial operating state parameters, and control parameters to delay frosting; when the indoor heat exchanger pipe temperature is greater than the third inner pipe temperature threshold, it indicates that the basic indoor heating demand is met. At this time, the frequency reduction operating mode is entered to reduce the compressor frequency, reduce power consumption, slow down the frosting speed, and improve energy efficiency; when the indoor heat exchanger pipe temperature is greater than the second inner pipe temperature threshold and less than or equal to the third inner pipe temperature threshold... The system enters speed adjustment mode. When the indoor heat exchanger tube temperature is greater than the second inner tube temperature threshold and less than or equal to the third inner tube temperature threshold, it indicates that the basic indoor heating demand is low. In this case, by entering speed adjustment mode, the indoor fan speed is increased, allowing heat to be distributed to the indoor space more quickly and evenly, thereby improving the uniformity of indoor air supply temperature, enhancing thermal comfort, and improving energy efficiency. When the indoor heat exchanger tube temperature is greater than the first inner tube temperature threshold and less than or equal to the second inner tube temperature threshold, the system enters opening adjustment mode. When the indoor heat exchanger tube temperature is greater than the first inner tube temperature threshold and less than or equal to the second inner tube temperature threshold, it indicates that the basic indoor heating demand is low. When the basic indoor heating demand is high, the opening of the electronic expansion valve is increased by entering the opening adjustment mode to increase the refrigerant flow, thereby increasing the heating capacity and improving energy efficiency while ensuring comfort. When the indoor heat exchanger pipe temperature is less than or equal to the first inner pipe temperature threshold, and the temperature difference between the outdoor heat exchanger pipe temperature and the outdoor ambient temperature is less than or equal to the defrost temperature difference threshold, the system enters the defrost control mode. When the indoor heat exchanger pipe temperature is less than or equal to the first inner pipe temperature threshold, it indicates that the basic indoor heating demand is high, but the air conditioner's heating capacity is severely limited; in this case, the system enters the defrost control mode to defrost in a timely manner and restore good heating capacity. Therefore, this application, by monitoring the system status in real time and using the indoor heat exchanger pipe temperature as a reference, actively guides the system smoothly from a high-power, easily frosted operating point to a low-power, slowly frosted, high-efficiency state while ensuring the basic indoor heating demand. This achieves the triple goals of reducing the number of defrost cycles, reducing system energy consumption, and improving thermal comfort; it realizes a layered, progressive, adaptive defrost control mechanism with the indoor heat exchanger pipe temperature as the key criterion.In other words, this application can enter different operating modes according to the different temperature ranges of the indoor heat exchanger tube temperature, and realize a phased coordinated adjustment strategy that combines frequency regulation, speed regulation, opening degree regulation and defrosting control, so as to ensure user comfort while achieving energy saving, delaying frosting and timely defrosting. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the electrical connections of an air conditioner provided in one embodiment of this application; Figure 2 This is a flowchart illustrating the steps of a defrosting control method for an air conditioner provided in one embodiment of this application; Figure 3 This is a schematic diagram of the overall process of a defrosting control method for an air conditioner provided in one embodiment of this application; Figure 4 This is a schematic diagram of the hardware structure of an electronic device provided in one embodiment of this application. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments.
[0018] It should be understood that in the description of this application, the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0019] It should be noted that although a logical order is shown in the flowcharts in this application, in some cases, the steps shown or described may be performed in a different order than that shown in the flowcharts. In the description of this application, "several" means one or more, and "more" means two or more. The terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order in which the technical features are indicated.
[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.
[0021] This application provides a defrosting control method and controller for an air conditioner, an air conditioner, and a computer-readable storage medium, relating to the field of defrosting control technology. The method includes monitoring ambient temperature parameters, system temperature parameters, initial operating state parameters, and control parameters; comparing the indoor heat exchanger tube temperature with preset temperature thresholds; entering a frequency reduction mode when the indoor heat exchanger tube temperature is greater than a third inner tube temperature threshold; entering a speed regulation mode when the indoor heat exchanger tube temperature is greater than a second inner tube temperature threshold but less than or equal to a third inner tube temperature threshold; entering an opening degree regulation mode when the indoor heat exchanger tube temperature is greater than a first inner tube temperature threshold but less than or equal to a second inner tube temperature threshold; and entering a defrosting control mode when the indoor heat exchanger tube temperature is less than or equal to a first inner tube temperature threshold, and the temperature difference between the outdoor heat exchanger tube temperature and the outdoor ambient temperature is less than or equal to a defrosting temperature difference threshold. This method ensures user comfort while achieving energy saving, delaying frost formation, and timely defrosting.
[0022] The embodiments of this application will be further described below with reference to the accompanying drawings.
[0023] like Figure 1 As shown, the air conditioner 100 includes, but is not limited to: a controller 101, a compressor 102 electrically connected to the controller 101, an indoor fan 103, and an electronic expansion valve 104. It should be noted that the air conditioner 100 also includes: an outdoor heat exchanger equipped with a temperature sensor and an indoor heat exchange tube. The controller 101 is used to implement the defrosting control method for the air conditioner provided in this application embodiment. It can enter different operating modes according to different temperature ranges of the indoor heat exchanger tube temperature, realizing a phased coordinated adjustment strategy combining frequency regulation, speed regulation, opening degree regulation, and defrosting control. This ensures user comfort while achieving energy saving, delaying frosting, and timely defrosting.
[0024] Those skilled in the art will understand that the system structure shown in the figures does not constitute a limitation on the embodiments of this application, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.
[0025] The system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.
[0026] It will be understood by those skilled in the art that the system architecture and application scenarios described in the embodiments of this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. It is known by those skilled in the art that with the evolution of system architecture and the emergence of new application scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.
[0027] Based on the above system structure, various embodiments of the defrosting control method for air conditioners of this application are proposed below.
[0028] like Figure 2 As shown, this defrosting control method for air conditioners can be applied to applications such as... Figure 1 In the controller of the air conditioning system shown, the defrosting control method for the air conditioner may include, but is not limited to, steps S100 to S600.
[0029] Step S100: During the monitoring period, the ambient temperature parameters, the air conditioner's system temperature parameters, the initial operating status parameters, and the control parameters are obtained through monitoring and processing. The ambient temperature parameters include the outdoor ambient temperature and the indoor ambient temperature. The system temperature parameters include the outdoor heat exchanger tube temperature and the indoor heat exchanger tube temperature.
[0030] Step S200: Compare the indoor heat exchanger tube temperature with the preset temperature threshold information to obtain the temperature comparison result; the preset temperature threshold information includes: a first inner tube temperature threshold, a second inner tube temperature threshold greater than the first inner tube temperature threshold, and a third inner tube temperature threshold greater than the second inner tube temperature threshold.
[0031] Step S300: When the indoor heat exchanger tube temperature is greater than the third inner tube temperature threshold, the frequency reduction working mode is entered based on the indoor heat exchanger tube temperature, initial operating status parameters and control parameters to delay frosting.
[0032] Step S400: When the temperature of the indoor heat exchanger tube is greater than the second inner tube temperature threshold and less than or equal to the third inner tube temperature threshold, enter the speed regulation mode.
[0033] Step S500: When the indoor heat exchanger tube temperature is greater than the first inner tube temperature threshold and less than or equal to the second inner tube temperature threshold, enter the opening adjustment mode.
[0034] Step S600: When the indoor heat exchanger tube temperature is less than or equal to the first inner tube temperature threshold and the temperature difference between the outdoor heat exchanger tube temperature and the outdoor ambient temperature is less than or equal to the defrosting temperature difference threshold, enter the defrosting control mode.
[0035] Further explanation of step S100. Specifically, the ambient temperature parameters include the outdoor ambient temperature T_outer loop and the indoor ambient temperature T_inner loop; the system temperature parameters include the outdoor heat exchanger tube temperature T_outer tube and the indoor heat exchanger tube temperature T_inner tube; the initial operating status parameters include: the compressor's initial frequency F_initial, the indoor fan speed Fan, and the electronic expansion valve's initial opening B_initial; the control parameters include the periodic monitoring duration t and the defrosting temperature difference threshold T_h.
[0036] Specifically, in step S200, the preset temperature threshold information is configured before executing step S100. This preset temperature threshold information includes multiple layered temperature thresholds: a first inner tube temperature threshold Tmin_1 (unit: °C), a second inner tube temperature threshold Tmin_2 (unit: °C), and a third inner tube temperature threshold Tmin_3 (unit: °C), where Tmin_1 < Tmin_2 < Tmin_3. In addition, the following parameters also need to be pre-configured: a preset judgment constant for the inner tube temperature change rate: T_a (a negative constant); an electronic expansion valve opening adjustment constant: B_1 (unit: steps); and a compressor frequency reduction lower limit: F_min = F_initial × 85% (rounding rule: rounded up to the nearest integer). It should be noted that all temperature parameters are in °C, frequency is in Hz, opening is in steps, and time is in seconds. The thresholds can be dynamically adjusted according to the external ambient temperature and humidity.
[0037] Specifically, the temperature comparison result is one of the following: the indoor heat exchanger tube temperature is greater than the third inner tube temperature threshold, the indoor heat exchanger tube temperature is greater than the second inner tube temperature threshold and less than or equal to the third inner tube temperature threshold, the indoor heat exchanger tube temperature is greater than the first inner tube temperature threshold and less than or equal to the second inner tube temperature threshold, or the indoor heat exchanger tube temperature is less than or equal to the first inner tube temperature threshold.
[0038] Through steps S100 to S600, during the heating operation of the air conditioner, firstly, monitoring and processing are performed within the monitoring cycle to obtain ambient temperature parameters, air conditioner system temperature parameters, initial operating status parameters, and control parameters; the ambient temperature parameters include outdoor ambient temperature and indoor ambient temperature; the system temperature parameters include outdoor heat exchanger pipe temperature and indoor heat exchanger pipe temperature; secondly, the indoor heat exchanger pipe temperature is compared with preset temperature threshold information to obtain a temperature comparison result; the preset temperature threshold information includes: a first inner pipe temperature threshold, a second inner pipe temperature threshold greater than the first inner pipe temperature threshold, and a third inner pipe temperature threshold greater than the first inner pipe temperature threshold. The second inner tube temperature threshold and the third inner tube temperature threshold are compared to lay the foundation for selecting different operating modes. Then, when the indoor heat exchanger tube temperature is greater than the third inner tube temperature threshold, a frequency reduction mode is entered based on the indoor heat exchanger tube temperature, initial operating parameters, and control parameters to delay frosting. When the indoor heat exchanger tube temperature is greater than the third inner tube temperature threshold, it indicates that the basic indoor heating demand is met. At this time, the frequency reduction mode is entered to reduce the compressor frequency, reduce power consumption, slow down the frosting rate, and improve energy efficiency. When the indoor heat exchanger tube temperature is greater than the second inner tube temperature threshold but less than or equal to the third inner tube temperature threshold... When the temperature threshold is met, the fan speed is adjusted. If the indoor heat exchanger tube temperature is greater than the second inner tube temperature threshold but less than or equal to the third inner tube temperature threshold, it indicates a low basic heating demand. In this case, the fan speed is increased by adjusting the fan speed to distribute heat more quickly and evenly throughout the room, improving the uniformity of the indoor air temperature, enhancing thermal comfort, and increasing energy efficiency. If the indoor heat exchanger tube temperature is greater than the first inner tube temperature threshold but less than or equal to the second inner tube temperature threshold, the fan opening is adjusted. A high value indicates a large basic heating demand indoors. In this case, the opening of the electronic expansion valve is increased by entering the opening adjustment mode to increase the refrigerant flow, thereby increasing the heating capacity and improving energy efficiency while ensuring comfort. When the indoor heat exchanger pipe temperature is less than or equal to the first inner pipe temperature threshold, and the temperature difference between the outdoor heat exchanger pipe temperature and the outdoor ambient temperature is less than or equal to the defrosting temperature difference threshold, the system enters the defrosting control mode. When the indoor heat exchanger pipe temperature is less than or equal to the first inner pipe temperature threshold, it indicates a large basic heating demand indoors, but the air conditioner's heating capacity is severely limited. In this case, the system enters the defrosting control mode to defrost in a timely manner and restore good heating capacity. It can be seen that this application, by monitoring the system status in real time and using the indoor heat exchanger pipe temperature as a reference, actively guides the system smoothly from a high-power, easily frosted operating point to a low-power, slowly frosted, high-efficiency state while ensuring the basic heating demand indoors. This achieves the triple goals of reducing the number of defrostings, reducing system energy consumption, and improving thermal comfort. It realizes a layered and progressive adaptive defrosting control mechanism with the indoor heat exchanger pipe temperature as the key criterion.In other words, this application can enter different operating modes according to the different temperature ranges of the indoor heat exchanger tube temperature, and realize a phased coordinated adjustment strategy that combines frequency regulation, speed regulation, opening degree regulation and defrosting control, so as to ensure user comfort while achieving energy saving, delaying frosting and timely defrosting.
[0039] According to some embodiments of this application, the air conditioner includes a compressor; further describing step S300, wherein the frequency reduction working mode is entered based on the indoor heat exchanger tube temperature, initial operating state parameters and control parameters, including but not limited to steps S310 to S350.
[0040] Step S310: Calculate the rate of change of the inner tube temperature during the monitoring period based on the indoor heat exchanger tube temperature.
[0041] Step S320: Perform steady-state operation judgment processing based on the inner tube temperature change rate and preset judgment constant to obtain steady-state judgment result.
[0042] Step S330: If the steady-state determination result indicates that the rate of change of the inner tube temperature is greater than the preset determination constant, keep the initial operating state parameters unchanged.
[0043] Step S340: When the steady-state judgment result indicates that the rate of change of the inner tube temperature is less than or equal to the preset judgment constant, the target frequency is obtained by frequency adjustment calculation based on the rate of change of the inner tube temperature, the initial operating state parameters and the control parameters, and the operating frequency of the compressor is adjusted to the target frequency.
[0044] Step S350: When the compressor is operating at the target frequency, perform the first cycle judgment process based on the recalculated inner tube temperature change rate or the continuously monitored indoor heat exchanger tube temperature, and switch modes based on the obtained first cycle judgment result.
[0045] Specifically, the formula for calculating the inner tube temperature change rate ΔT_inner tube in step S310 is: △T_inner tube = T_inner tube t T_inner tube (t) △t); where △t is the duration of a single monitoring cycle, T_inner tube t refers to T_inner tube at time t, T_inner tube (t △t) represents (t) The inner tube at time △t).
[0046] Specifically, in step S320, the preset judgment constant is T_a, and the steady-state judgment results include: the inner tube temperature change rate is greater than the preset judgment constant, and the inner tube temperature change rate is less than or equal to the preset judgment constant. It should be noted that if ΔT_inner tube > T_a, it indicates that the system is in a steady state or has good performance, and the current initial operating parameters are maintained; if ΔT_inner tube ≤ T_a, it indicates that the system performance has degraded, and the process proceeds to step S340 for frequency reduction processing.
[0047] According to some embodiments of this application, the initial operating state parameters include: the compressor initial frequency; the control parameters include the periodic monitoring duration; further, step S340 is described, wherein the target frequency is obtained by frequency adjustment calculation based on the inner tube temperature change rate, the initial operating state parameters and the control parameters, including but not limited to steps S341 to S342.
[0048] Step S341: The frequency reduction rate is obtained by performing rate calculation processing based on the inner tube temperature change rate, preset proportional constant, and periodic monitoring duration.
[0049] Specifically, according to some embodiments of this application, step S341 includes: multiplying a preset proportional constant by the absolute value of the inner tube temperature change rate to obtain a proportional coefficient; and dividing the product of the proportional coefficient and the absolute value of the inner tube temperature change rate by the periodic monitoring duration to obtain the frequency reduction rate.
[0050] The calculation formula in the rate calculation process of step S341 is as follows: ; Where k is the proportionality coefficient, k = α |△T_inner tube|; α is a proportionality constant, k is positively correlated with the inner tube temperature change rate △T_inner tube; |△T_inner tube| represents the absolute value of the inner tube temperature change rate (due to frost, the inner tube temperature change rate is usually negative, so the absolute value is used in the calculation). t is the periodic monitoring duration.
[0051] Step S342: Multiply the frequency reduction rate, the cumulative number of monitoring cycles, and the compressor initial frequency in sequence to obtain the reference frequency; subtract the reference frequency from the compressor initial frequency to obtain the target frequency; wherein, the target frequency is greater than or equal to the preset minimum frequency.
[0052] Specifically, the formula for calculating the target frequency in step S342 is as follows: F = F_initial η×β×F_initial; where β is the cumulative number of monitoring cycles and the duration of each monitoring cycle is t; η is the frequency reduction rate.
[0053] In step S342, a lower frequency limit is set: a preset minimum frequency F_min, where F_min = F_initial × 85%, and the target frequency F ≥ F_min.
[0054] Specifically, step S350 is further described. Step S350 includes: recalculating the change rate of the inner tube temperature △T_inner after frequency reduction. If △T_inner > T_a, enter the steady-state operation mode based on the initial operation state parameters; otherwise, if △T_inner ≤ T_a, perform the frequency reduction process shown in step S340; during the frequency reduction to F_min, as long as T_inner ≤ Tmin_3 appears, directly enter the speed regulation mode shown in step S400.
[0055] Through steps S310 to S350, when the indoor heat exchanger tube temperature is greater than the third inner tube temperature threshold, it indicates that the basic heating demand of the room is met. At this time, enter the frequency reduction working mode to reduce the frequency of the compressor, reduce power consumption, slow down the frosting speed, and improve energy efficiency.
[0056] According to some embodiments of the present application, the air conditioner further includes an inner fan; step S400 is further described. Among them, entering the speed regulation mode includes, but is not limited to, steps S410 to S430.
[0057] Step S410: After every preset number of monitoring cycles, determine the target speed gear based on the current speed gear.
[0058] Step S420: Control the inner fan to operate at the target speed gear.
[0059] Step S430: When the inner fan is operating at the target speed gear, perform the second cycle determination process according to the continuously monitored indoor heat exchanger tube temperature, and perform mode switching according to the obtained second cycle judgment result.
[0060] Specifically, the specific process of determining the target speed gear in step S410 is: reduce the fan speed (Fan) of the inner fan by one gear every 3 monitoring cycles; and the maximum reduction is 2 gears in total (e.g., super strong gear → high wind gear → medium high wind gear).
[0061] Specifically, step S430 is further described. Among them, performing the second cycle determination process according to the continuously monitored indoor heat exchanger tube temperature and performing mode switching according to the obtained second cycle judgment result includes: if T_inner > Tmin_3 after reducing the speed gear, return to execute step S300 to enter the frequency reduction working mode; if Tmin_1 < T_inner ≤ Tmin_2, execute step S500 to enter the opening degree regulation mode.
[0062] Through steps S410 to S430, when the indoor heat exchanger tube temperature is greater than the second inner tube temperature threshold and less than or equal to the third inner tube temperature threshold, it indicates that the basic indoor heating demand is small. At this time, by entering the speed adjustment mode, the speed of the indoor fan is increased, so that the heat is distributed to the indoor space faster and more evenly, thereby improving the uniformity of indoor air supply temperature, improving thermal comfort, and improving energy efficiency.
[0063] According to some embodiments of this application, the air conditioner also includes an electronic expansion valve; further describing step S500, wherein entering the opening adjustment mode includes, but is not limited to, steps S510 to S530.
[0064] Step S510: Add the product of the cumulative number of monitoring cycles and the preset opening adjustment step constant to the opening at the previous moment to obtain the target opening at the current moment; wherein, the target opening is less than or equal to the preset maximum opening.
[0065] Step S520: Adjust the opening of the electronic expansion valve to the target opening.
[0066] Step S530: With the electronic expansion valve at the target opening, perform a third cycle judgment based on the continuously monitored indoor heat exchanger tube temperature, and switch modes based on the third cycle judgment result.
[0067] Specifically, in step S510, the formula for calculating the target opening at the current moment is: B_current moment = B_previous moment + β × B_1; where β is the cumulative number of monitoring cycles and the duration of each monitoring cycle is t; B_1 is the preset opening adjustment step constant. The preset maximum opening is B_max, which is used to prevent excessive opening.
[0068] Specifically, step S530 is further explained, wherein the third cycle judgment process is performed based on the indoor heat exchanger tube temperature obtained by continuous monitoring, and the mode switching is performed based on the obtained third cycle judgment result, including: continuously monitoring the indoor heat exchanger tube temperature, and when the indoor heat exchanger tube temperature is less than or equal to Tmin_1 of the first inner tube temperature threshold, then entering the defrosting control mode shown in step S600.
[0069] Through steps S510 to S530, when the indoor heat exchanger tube temperature is greater than the first inner tube temperature threshold and less than or equal to the second inner tube temperature threshold, it indicates that the basic indoor heating demand is large. At this time, by entering the opening adjustment mode, the opening of the electronic expansion valve is increased to increase the refrigerant flow, improve the heating capacity, and improve energy efficiency while ensuring comfort.
[0070] According to some embodiments of this application, step S600 is further described, wherein entering the defrost control mode includes, but is not limited to, steps S610 to S620.
[0071] Step S610: Stop heating operation and defrost the air conditioner.
[0072] Step S620: After the defrosting process is completed, the air conditioner is controlled to run again based on the initial operating status parameters. The monitoring and comparison processes are repeated to obtain new comparison results. Based on the new comparison results, the air conditioner can enter either the frequency reduction mode, the speed adjustment mode, the opening adjustment mode, or the defrosting control mode.
[0073] It should be noted that there are two triggering conditions for entering the defrost control mode in this application: T_inner pipe ≤ Tmin_1 and T_outer pipe - T_outer loop ≤ T_h. Only when both triggering conditions are met simultaneously can the defrost control mode be entered, heating operation be stopped, and the defrost program be started. After defrosting is completed, the initial operating parameters (F_initial, Fan_initial, B_initial) are restored, and the air conditioner is controlled to operate again. The cycle monitoring and judgment are restarted, that is, the monitoring processing in step S100 and the comparison processing in step S200 are repeated to obtain a new comparison result. Based on the new comparison result, the air conditioner enters the frequency reduction working mode shown in step 300, the speed adjustment mode shown in step 400, the opening degree adjustment mode shown in step 500, or the defrost control mode shown in step 600.
[0074] Through steps S610 to S620, when the indoor heat exchanger tube temperature is less than or equal to the first inner tube temperature threshold, it indicates that the basic indoor heating demand is large, while the heating capacity of the air conditioner is severely limited. In this case, the defrosting control mode is entered to defrost in time and restore good heating capacity.
[0075] As an example, this application provides a method for controlling the defrosting of an air conditioner.
[0076] The parameters collected in the initial state are as follows: T_outer ring = 2℃, T_inner ring = 24℃, T_inner tube = 42℃, F_initial = 100Hz, Fan = super strong, B_initial = 250 steps, t = 60s, T_h = -5℃; the preset parameters are as follows: Tmin_1 = 36℃, Tmin_2 = 38℃, Tmin_3 = 40℃, T_a = -1.5℃, B_1 = 20 steps, B_max = 60 steps.
[0077] The process is as follows: S1: When T_inner tube > Tmin_3 and △T_inner tube = -1.6°C ≤ T_a, enter the frequency reduction working mode. Calculate the frequency reduction rate η and the target frequency, and reduce the frequency to the target frequency of 94 Hz. When it is continuously monitored that T_inner tube = 39°C, then enter step S2.
[0078] S2: Increase the wind speed to the high wind gear. After operation, T_inner tube = 41°C > Tmin_3, return to step S1.
[0079] S3: When △T_inner tube = -1.7°C ≤ T_a, continue to reduce the frequency to 90 Hz (F_min). When T_inner tube = 39°C, then enter step S4.
[0080] S4: Reduce the inner fan wind speed to the medium - high wind gear. When T_inner tube = 37°C and Tmin_1 < T_inner tube ≤ Tmin_2, enter step S5.
[0081] S5: Increase the opening degree of the electronic expansion valve to B = 250 + β×20 until B_max. When T_inner tube = 36°C ≤ Tmin_1 and T_outer tube - T_outer ring = -6°C ≤ T_h, enter the defrosting mode.
[0082] S6: After defrosting is completed, restore the initial parameters and monitor again.
[0083] It can be seen that this application proposes an adaptive defrosting control method with hierarchical progression and the inner tube temperature as the key criterion. By real - time monitoring of the system state, on the premise of ensuring the basic heating demand of the room (reflected by the inner tube temperature), the system is actively guided from a high - power - consumption and easy - frosting operating point to a high - energy - efficiency state with low power consumption and slow frosting, so as to achieve the triple goals of reducing the defrosting frequency, reducing the system energy consumption, and improving the thermal comfort. It solves the problems of accelerated frosting, low energy efficiency in the later stage of frosting, and frequent defrosting caused by blindly maintaining high - frequency operation in conventional air conditioners during low - temperature heating. This application realizes system energy conservation and stable operation through intelligent regulation without sacrificing user comfort.
[0084] Combined Figure 3 , take an example to illustrate the complete flow schematic diagram of the defrosting control method for the air conditioner provided by the embodiment of this application.
[0085] Step S1: Periodically monitor relevant parameters: ambient temperature parameter, system temperature parameter of the air conditioner, initial operating state parameter, and control parameter.
[0086] Step S2: Judge the interval where T_inner tube is located. When Tmin3 < T_inner tube, execute step S3; when Tmin2 < T_inner tube ≤ Tmin3, execute step S9; when Tmin1 < T_inner tube ≤ Tmin2, execute step S10; when T_inner tube ≤ Tmin1, execute step S11.
[0087] Step S3: Calculate the temperature change rate △T_inner tube of the inner tube.
[0088] Step S4: Determine whether △T_inner tube > the preset determination constant Ta holds; if not, jump to execute Step S5; if so, jump to execute Step S6.
[0089] Step S5: Steady-state operation; then continue to execute Steps S12 to S13.
[0090] Step S6: Enter the frequency reduction working mode of the compressor.
[0091] Step S7: Determine whether △T_inner tube > the preset determination constant Ta holds; if so, jump to execute Step S5; if not, jump to execute Step S8.
[0092] Step S8: Determine whether Tmin2 < T_inner tube ≤ Tmin3 holds; if so, jump to execute Step S2; if not, jump to execute Step S6.
[0093] Step S9: Reduce the rotational speed of the inner fan; then execute Steps S12 to S13.
[0094] Step S10: Increase the opening degree of the electronic expansion valve; then execute Steps S12 to S13.
[0095] Step S11: Execute the defrosting process. After the defrosting is completed, operate according to the initial operating state parameters, and execute Steps S12 to S13.
[0096] Step S12: Continue to monitor.
[0097] Step S13: Wait for the next monitoring cycle to execute Step S1.
[0098] It should be noted that this application mainly achieves two beneficial effects. One is in terms of energy conservation: through the collaborative adjustment strategy of "frequency reduction - wind reduction - increased opening degree", the system can dynamically optimize and maintain at a high energy efficiency operating point, achieving active energy conservation. At the same time, this strategy effectively delays frosting by increasing the evaporation temperature, directly reducing the energy loss during the defrosting process itself and the additional energy consumption caused by the interruption of heating. The other is in terms of comfort: taking the temperature of the indoor heat exchanger tube as the core monitoring index and setting hierarchical thresholds ensures that the supply air temperature is always within the comfortable range. This solution intervenes at the initial stage of frosting, avoiding the sharp reduction in performance and frequent defrosting caused by "deep frosting" of the system, thus ensuring the stability of the room temperature throughout the heating cycle and fundamentally improving the user experience.
[0099] As Figure 4 shown, the present invention also provides a controller, including: The processor 401 can be implemented using a general-purpose central processing unit (CPU), microprocessor, application specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this application. The memory 402 can be implemented as a read-only memory (ROM), static storage device, dynamic storage device, or random access memory (RAM). The memory 402 can store the operating system and other applications. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 402 and called by the processor 401 to execute the defrosting control method for the air conditioner according to the embodiments of this application. Input / output interface 403 is used to implement information input and output; The communication interface 404 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.). Bus 405 transmits information between various components of the device (e.g., processor 401, memory 402, input / output interface 403, and communication interface 404); The processor 401, memory 402, input / output interface 403 and communication interface 404 are connected to each other within the device via bus 405.
[0100] This application also provides an air conditioning system, including the controller described above.
[0101] This application embodiment also provides a storage medium, which is a computer-readable storage medium, storing a computer program that, when executed by a processor, implements the above-described defrosting control method for an air conditioner.
[0102] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof. The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separate, and may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.
[0103] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically include computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.
[0104] The above provides a detailed description of the preferred embodiments of this application. However, this application is not limited to the above-described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by this application.
Claims
1. A defrosting control method for an air conditioner, characterized in that, include: During the monitoring period, monitoring and processing are performed to obtain ambient temperature parameters, air conditioner system temperature parameters, initial operating status parameters, and control parameters; the ambient temperature parameters include outdoor ambient temperature and indoor ambient temperature; the system temperature parameters include outdoor heat exchanger tube temperature and indoor heat exchanger tube temperature; The temperature comparison result is obtained by comparing the indoor heat exchanger tube temperature with the preset temperature threshold information; the preset temperature threshold information includes: a first inner tube temperature threshold, a second inner tube temperature threshold greater than the first inner tube temperature threshold, and a third inner tube temperature threshold greater than the second inner tube temperature threshold. When the indoor heat exchanger tube temperature is greater than the third inner tube temperature threshold, the system enters a frequency reduction mode based on the indoor heat exchanger tube temperature, the initial operating status parameters, and the control parameters to delay frosting. When the temperature of the indoor heat exchanger tube is greater than the second inner tube temperature threshold and less than or equal to the third inner tube temperature threshold, the speed regulation mode is entered. When the temperature of the indoor heat exchanger tube is greater than the first inner tube temperature threshold and less than or equal to the second inner tube temperature threshold, the opening adjustment mode is entered. When the indoor heat exchanger tube temperature is less than or equal to the first inner tube temperature threshold and the temperature difference between the outdoor heat exchanger tube temperature and the outdoor ambient temperature is less than or equal to the defrosting temperature difference threshold, the defrosting control mode is entered.
2. The defrosting control method for an air conditioner according to claim 1, characterized in that, The air conditioner includes a compressor; the step of entering a frequency reduction mode based on the indoor heat exchanger pipe temperature, the initial operating status parameters, and the control parameters includes: The rate of change of the inner tube temperature during the monitoring period is calculated based on the inner heat exchanger tube temperature. The steady-state determination result is obtained by performing steady-state operation determination processing based on the inner tube temperature change rate and the preset determination constant. If the steady-state determination result indicates that the rate of change of the inner tube temperature is greater than the preset determination constant, the initial operating state parameters shall remain unchanged. If the steady-state determination result indicates that the rate of change of the inner tube temperature is less than or equal to the preset determination constant, the target frequency is obtained by frequency adjustment calculation based on the rate of change of the inner tube temperature, the initial operating state parameters and the control parameters, and the operating frequency of the compressor is adjusted to the target frequency. When the compressor is operating at the target frequency, a first cycle determination process is performed based on the recalculated inner pipe temperature change rate or the continuously monitored indoor heat exchanger pipe temperature, and a mode switch is performed based on the obtained first cycle determination result.
3. The defrosting control method for an air conditioner according to claim 2, characterized in that, The initial operating status parameters include: compressor initial frequency; the control parameters include periodic monitoring duration; The step of calculating the target frequency based on the inner tube temperature change rate, the initial operating state parameters, and the control parameters includes: The frequency reduction rate is obtained by calculating the rate of change of the inner tube temperature, the preset proportional constant, and the periodic monitoring duration. The reference frequency is obtained by multiplying the frequency reduction rate, the cumulative number of monitoring cycles, and the initial frequency of the compressor in sequence; the target frequency is obtained by subtracting the reference frequency from the initial frequency of the compressor; wherein the target frequency is greater than or equal to the preset minimum frequency.
4. The defrosting control method for an air conditioner according to claim 3, characterized in that, The process of calculating the frequency reduction rate based on the inner tube temperature change rate, a preset proportional constant, and the periodic monitoring duration includes: The proportional coefficient is obtained by multiplying the preset proportional constant by the absolute value of the inner tube temperature change rate. The frequency reduction rate is obtained by dividing the product of the proportional coefficient and the absolute value of the inner tube temperature change rate by the periodic monitoring duration.
5. The defrosting control method for an air conditioner according to claim 1, characterized in that, The air conditioner also includes an indoor fan; The entry into the speed regulation mode includes: After a preset number of monitoring cycles, the target speed gear is determined based on the current speed gear. Control the internal fan to operate at the target speed setting; When the internal fan is operating at the target speed, a second cycle determination is performed based on the continuously monitored indoor heat exchanger tube temperature, and the mode is switched based on the second cycle determination result.
6. The defrosting control method for an air conditioner according to claim 1, characterized in that, The air conditioner also includes an electronic expansion valve; the entry into the opening adjustment mode includes: The target opening degree at the current moment is obtained by adding the product of the cumulative number of monitoring cycles and the preset opening degree adjustment step constant to the opening degree at the previous moment; wherein the target opening degree is less than or equal to the preset maximum opening degree. Adjust the opening degree of the electronic expansion valve to the target opening degree; When the electronic expansion valve is at the target opening degree, a third cycle judgment process is performed based on the continuously monitored indoor heat exchanger tube temperature, and a mode switch is performed based on the obtained third cycle judgment result.
7. The defrosting control method for an air conditioner according to claim 1, characterized in that, The defrost control mode includes: Stop heating operation and defrost the air conditioner; After the defrosting process is completed, the air conditioner is controlled to operate again based on the initial operating state parameters. The monitoring process and the comparison process are repeated to obtain a new comparison result. Based on the new comparison result, the air conditioner enters the frequency reduction mode, the speed adjustment mode, the opening degree adjustment mode, or the defrosting control mode.
8. A controller, characterized in that, It includes at least one processor and a memory for communicatively connecting to the at least one processor; the memory stores instructions executable by the at least one processor, which, when executed by the at least one processor, enable the at least one processor to perform the defrosting control method for an air conditioner as described in any one of claims 1 to 7.
9. An air conditioner, characterized in that, Includes the controller as described in claim 8.
10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions for causing a computer to perform the defrosting control method for an air conditioner as described in any one of claims 1 to 7.