Self-cleaning control method, device and computer program product for an air conditioner

Abstract

This application provides a self-cleaning control method, device, and computer program product for an air conditioner. The method includes: acquiring the current of the outdoor fan of the air conditioner under the current operating condition to obtain the actual fan current; acquiring the temperature of the power module of the air conditioner under the current operating condition to obtain the junction temperature; calculating the current deviation rate between the actual fan current and the corresponding reference current, where the reference current is the current of the outdoor fan of the air conditioner under the current operating condition when the air conditioner was manufactured; determining that the condenser of the air conditioner is clogged when the current deviation rate is greater than or equal to a first predetermined threshold and the junction temperature is greater than or equal to a first temperature threshold; and controlling the air conditioner to perform a self-cleaning operation, thus solving the problem of high misjudgment rate of condenser clog in the prior art.

Description

Technical Field

[0001] This application relates to the field of air conditioner self-cleaning technology, and more specifically, to an air conditioner self-cleaning control method, apparatus, computer-readable storage medium, and computer program product. Background Technology

[0002] The condenser of the outdoor unit of the air conditioner is exposed to the outdoor environment for a long time. Dust, catkins, insects, oil and other impurities can easily adhere to and clog the heat dissipation fins, resulting in a significant decrease in the heat exchange efficiency of the condenser. This leads to a sudden increase in the operating load of the outdoor fan and abnormally high phase current of the fan. At the same time, the air conditioning system pressure increases and the compressor exhaust temperature rises, which causes a sharp increase in the conduction loss and switching loss of the IPM power module. The module temperature rise exceeds the standard, and long-term operation is prone to overheating, burnout and breakdown, which seriously reduces the overall reliability and service life of the air conditioner.

[0003] Existing technologies for detecting dirt and blockage in air conditioner condensers mostly rely on indirect parameters such as temperature, pressure, and heat transfer coefficient. These technologies suffer from drawbacks such as detection lag, susceptibility to environmental interference, high false positive rates, and inability to accurately classify condensers. Furthermore, protection for IPM modules is limited to passive over-temperature and over-current protection, which cannot address the root cause of high-temperature issues caused by dirt and blockage, resulting in limited protection effectiveness.

[0004] Some air conditioners are equipped with condenser self-cleaning functions, but existing self-cleaning technologies are mostly timed, manual, or triggered based on runtime, lacking precise graded linkage control based on the degree of dirt and blockage. This results in problems such as over-cleaning, untimely cleaning, and energy waste. Furthermore, it cannot form a coordinated control logic with the IPM module temperature rise protection, making it difficult to completely solve the industry pain point of reduced IPM module reliability caused by dirt and blockage. Summary of the Invention

[0005] The main objective of this application is to provide a self-cleaning control method, device, computer-readable storage medium, and computer program product for air conditioners, so as to at least solve the problem of high false alarm rate of condenser clogging in air conditioners in the prior art.

[0006] To achieve the above objectives, according to one aspect of this application, a self-cleaning control method for an air conditioner is provided, comprising: acquiring the current of the outdoor fan of the air conditioner under current operating conditions to obtain an actual fan current; acquiring the temperature of the power module of the air conditioner under the current operating conditions to obtain a junction temperature; calculating the current deviation rate between the actual fan current and a corresponding reference current, wherein the reference current is the current of the outdoor fan of the air conditioner under the current operating conditions at the time of manufacture; determining that the condenser of the air conditioner is clogged when the current deviation rate is greater than or equal to a first predetermined threshold and the junction temperature is greater than or equal to a first temperature threshold; and controlling the air conditioner to perform a self-cleaning operation.

[0007] Optionally, determining that the condenser of the air conditioner is clogged when the current deviation rate is greater than or equal to a first predetermined threshold and the junction temperature is greater than or equal to a first temperature threshold includes: obtaining the fin temperature of the condenser and the outdoor ambient temperature under the current operating condition; calculating the difference between the fin temperature and the outdoor ambient temperature to obtain the heat exchange temperature difference; and determining that the condenser is clogged when the current deviation rate is greater than or equal to the predetermined threshold, the junction temperature is greater than or equal to the first temperature threshold, and the heat exchange temperature difference is greater than or equal to the temperature difference threshold.

[0008] Optionally, after determining that the condenser of the air conditioner is clogged, the method further includes: if the current deviation rate within a first predetermined time period is greater than or equal to the first predetermined threshold and less than the second predetermined threshold, determining that the condenser is slightly clogged, wherein the second predetermined threshold is greater than the first predetermined threshold; if the current deviation rate within a second predetermined time period is greater than or equal to the second predetermined threshold and less than the third predetermined threshold, determining that the condenser is moderately clogged, wherein the third predetermined threshold is greater than the second predetermined threshold; and if the current deviation rate within a third predetermined time period is greater than or equal to the third predetermined threshold, determining that the condenser is severely clogged.

[0009] Optionally, the method further includes: controlling the heat sink of the power module to shut off when the condenser is slightly clogged; controlling the heat sink of the power module to operate at a first speed when the condenser is moderately clogged; and controlling the heat sink of the power module to operate at a second speed when the condenser is severely clogged, wherein the first speed is less than the second speed.

[0010] Optionally, the method further includes: if the junction temperature is lower than the second temperature threshold or the condenser's fouling level decreases within a fourth predetermined time period, controlling the power module's heat sink to shut down, wherein the second temperature threshold is lower than the first temperature threshold.

[0011] Optionally, controlling the air conditioner to perform a self-cleaning operation includes: triggering light-load self-cleaning when the condenser is slightly clogged and the cumulative standby time is greater than or equal to a time threshold, causing the outdoor fan to run at a first predetermined speed for a first cleaning time; triggering regular self-cleaning when the condenser is moderately clogged, causing the outdoor fan to alternately run at the first predetermined speed in both forward and reverse directions for the first cleaning time; and controlling the radiator of the power module to turn on and triggering compressor frequency limiting protection and powerful self-cleaning when the condenser is severely clogged, causing the outdoor fan to alternately run at a second predetermined speed in both forward and reverse directions for a second cleaning time, wherein the second predetermined speed is greater than the first predetermined speed and the second cleaning time is greater than the first cleaning time.

[0012] Optionally, the method further includes: controlling the air conditioner to stop performing the self-cleaning operation when the current deviation rate is less than a fourth predetermined threshold during the self-cleaning operation, wherein the fourth predetermined threshold is less than the first predetermined threshold; performing the self-cleaning operation once at a fifth predetermined time interval when the condenser's dirt blockage level does not decrease after the air conditioner performs the self-cleaning operation; and sending a fault reminder when the number of self-cleaning operations is greater than or equal to a predetermined number and the condenser's dirt blockage level does not decrease.

[0013] Optionally, controlling the air conditioner to perform a self-cleaning operation includes: when the current time is a high-frequency usage period, delaying the self-cleaning operation to a standby state before controlling the air conditioner to perform the self-cleaning operation, wherein the high-frequency usage period is a period in which the historical usage frequency is greater than a predetermined frequency; and when the current time is an idle period, controlling the air conditioner to perform the self-cleaning operation, wherein the idle period is a period other than the high-frequency usage period.

[0014] According to another aspect of this application, a self-cleaning control device for an air conditioner is provided, comprising: an acquisition unit, configured to acquire the current of the outdoor fan of the air conditioner under current operating conditions to obtain an actual fan current, and acquire the temperature of the power module of the air conditioner under the current operating conditions to obtain a junction temperature; a calculation unit, configured to calculate the current deviation rate between the actual fan current and a corresponding reference current, wherein the reference current is the current of the outdoor fan of the air conditioner under the current operating conditions at the time of manufacture; a first determination unit, configured to determine that the condenser of the air conditioner is clogged when the current deviation rate is greater than or equal to a first predetermined threshold and the junction temperature is greater than or equal to a first temperature threshold; and a first control unit, configured to control the air conditioner to perform a self-cleaning operation.

[0015] According to another aspect of this application, a computer program product is provided, comprising a computer program that, when executed by a processor, implements any of the methods described.

[0016] By applying the technical solution of this application, in the above-mentioned self-cleaning control method of the air conditioner, the current deviation rate between the actual fan current and the corresponding reference current under the current operating condition is calculated, and the temperature of the power module of the air conditioner under the current operating condition, i.e., the junction temperature, is obtained. If both the current deviation rate and the junction temperature are greater than or equal to the first predetermined threshold and the first temperature threshold are satisfied, it can be determined that the air conditioner's condenser is clogged. Then, the air conditioner is controlled to perform self-cleaning operation. The current deviation rate and the junction temperature are mutually verified. Only when both indicators meet the corresponding conditions can the air conditioner's condenser be determined to be clogged. This avoids misjudgment of condenser clog leading to untimely or excessive cleaning and avoids the power module being easily overheated and damaged. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 A hardware structure block diagram of a mobile terminal for performing a self-cleaning control method for an air conditioner, according to an embodiment of this application, is shown.

[0019] Figure 2 A schematic flowchart of a self-cleaning control method for an air conditioner according to an embodiment of this application is shown.

[0020] Figure 3 A structural block diagram of a self-cleaning control device for an air conditioner provided according to an embodiment of this application is shown.

[0021] The above figures include the following reference numerals:

[0022] 102. Processor; 104. Memory; 106. Transmission device; 108. Input / output device. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0025] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0026] As described in the background section, the existing technology has a high false alarm rate for air conditioner condenser clogging. To solve this problem, embodiments of this application provide a self-cleaning control method, apparatus, computer-readable storage medium, and computer program product for air conditioners.

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0028] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a self-cleaning control method for an air conditioner according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0029] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the self-cleaning control method of the air conditioner in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory and non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the aforementioned networks may include wireless networks provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0030] This embodiment provides a self-cleaning control method for an air conditioner that runs on a mobile terminal, computer terminal, or similar computing device. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Also, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0031] Figure 2 This is a flowchart of a self-cleaning control method for an air conditioner according to an embodiment of this application. Figure 2 As shown, the method includes the following steps:

[0032] Step S201: Obtain the current of the outdoor fan of the air conditioner under the current operating condition to obtain the actual fan current; obtain the temperature of the power module of the air conditioner under the current operating condition to obtain the junction temperature.

[0033] Specifically, during air conditioner operation, the high-precision current acquisition unit of the outdoor unit fan drive circuit collects the three-phase current of the fan in real time. After filtering and noise reduction, the real-time effective value of the current is obtained, which is the actual fan current I. actual Synchronously acquire the junction temperature of the power module (IPM module), i.e., the junction temperature T. j .

[0034] Step S202: Calculate the current deviation rate between the actual fan current and the corresponding reference current. The reference current is the current of the outdoor fan under the current operating conditions when the air conditioner was manufactured.

[0035] Specifically, through To calculate the current deviation rate ΔI, during the initial commissioning of the air conditioner, the three-phase currents of the outdoor fan are collected under different ambient temperatures, operating modes, fan speeds, and cooling / heating conditions, with the condenser clean. The effective values ​​are calculated and stored to establish a multi-condition fan phase current reference database, thus obtaining the reference current I. ref This eliminates the impact of differences in operating conditions on test results.

[0036] Step S203: If the current deviation rate is greater than or equal to a first predetermined threshold and the junction temperature is greater than or equal to a first temperature threshold, the condenser of the air conditioner is determined to be clogged.

[0037] Specifically, the current deviation rate is greater than or equal to a first predetermined threshold (e.g., 15%) and the junction temperature is greater than or equal to a first temperature threshold (e.g., 80°C), that is, when ΔI ≥ 15% and T j When the temperature is ≥80℃, the condenser of the above-mentioned air conditioner is determined to be dirty and clogged.

[0038] Step S204: Control the air conditioner to perform self-cleaning operation.

[0039] Specifically, the self-cleaning operation is only performed when the air conditioner's condenser is dirty or clogged, based on two indicators: current deviation rate and junction temperature. This prevents the power module from overheating and being damaged.

[0040] In this embodiment, the self-cleaning control method for the air conditioner calculates the current deviation rate between the actual fan current and the corresponding reference current under the current operating condition, and obtains the temperature of the air conditioner's power module under the current operating condition, i.e., the junction temperature. If both the current deviation rate and the junction temperature are greater than or equal to a first predetermined threshold and a first temperature threshold, the air conditioner's condenser can be determined to be clogged. The air conditioner is then controlled to perform self-cleaning. The current deviation rate and the junction temperature are mutually verified. Only when both indicators meet the corresponding conditions can the air conditioner's condenser be determined to be clogged. This avoids misjudgment of condenser clog leading to untimely or excessive cleaning, and prevents the power module from overheating and being damaged. This solves the problem of high misjudgment rate of condenser clog in the prior art.

[0041] To further ensure the accuracy of condenser blockage detection, in one optional implementation, step S203 includes:

[0042] Step S2031: Obtain the fin temperature of the condenser and the outdoor ambient temperature under the current operating conditions.

[0043] Step S2032: Calculate the difference between the above-mentioned fin temperature and the above-mentioned outdoor ambient temperature to obtain the heat exchange temperature difference;

[0044] Step S2033: If the current deviation rate is greater than or equal to a predetermined threshold, the junction temperature is greater than or equal to a first temperature threshold, and the heat exchange temperature difference is greater than or equal to a temperature difference threshold, then the condenser is determined to be dirty or clogged.

[0045] In the above implementation, the current deviation rate ΔI is calculated using the actual fan current, and the junction temperature T of the IPM module is simultaneously collected. j Condenser fin temperature T c Outdoor ambient temperature T env If the heat exchange temperature difference is greater than or equal to the temperature difference threshold, it indicates that the condenser's heat exchange efficiency is poor. For example, if the temperature difference threshold is 12℃, then when T... j ≥80℃ and T c -T env When the temperature rise is ≥12℃, it is confirmed that the abnormal temperature rise of the IPM module is caused by a dirty or clogged condenser, i.e., when ΔI ≥15% and T j ≥80℃ and T c -T env Only when both ≥12℃ are met can it be determined that the condenser is dirty or clogged.

[0046] To determine the level of condensation blockage, in one optional implementation, after determining that the condenser of the air conditioner is clogged, the method further includes:

[0047] Step S301: If the current deviation rate within the first predetermined time period is greater than or equal to the first predetermined threshold and less than the second predetermined threshold, the condenser is determined to be slightly clogged, and the second predetermined threshold is greater than the first predetermined threshold.

[0048] Step S302: If the current deviation rate within the second predetermined time period is greater than or equal to the second predetermined threshold and less than the third predetermined threshold, the condenser is determined to be moderately clogged, and the third predetermined threshold is greater than the second predetermined threshold.

[0049] In step S303, if the current deviation rate is greater than or equal to the third predetermined threshold within the third predetermined time period, the condenser is determined to be severely clogged.

[0050] In the above embodiments, taking a first predetermined duration of 3 minutes, a second predetermined duration of 2 minutes, a third predetermined duration of 1 minute, a first predetermined threshold of 15%, a second predetermined threshold of 30%, and a second predetermined threshold of 50% as examples, the first method combines the current deviation rate and the duration to classify condenser blockage into four levels: Normal state: ΔI < 15%, no blockage or slight dust accumulation, no intervention required; Slight blockage: 15% ≤ ΔI < 30%, duration ≥ 3 minutes, slight blockage of the condenser; Moderate blockage: 30% ≤ ΔI < 50%, duration ≥ 2 minutes, worsening blockage of the condenser; Severe blockage: ΔI ≥ 50%, duration ≥ 1 minute, severe blockage of the condenser.

[0051] To prevent the power module from overheating and being damaged, in one optional implementation, the above method further includes:

[0052] Step S401: If the condenser is only slightly clogged, the heat sink of the power module is shut off.

[0053] Step S402: When the condenser is moderately clogged, control the radiator of the power module to run at the first speed.

[0054] In step S403, when the condenser is severely clogged, the radiator of the power module is controlled to operate at a second speed, where the first speed is less than the second speed.

[0055] In the above implementation, for minor blockage: forced cooling is not activated, i.e., the heat sink is not opened, and only conventional passive cooling is maintained; for moderate blockage: the main control module drives the auxiliary cooling fan to run at half speed, and the heat pipe heat sink simultaneously enhances heat conduction to quickly remove the heat from the IPM module; for severe blockage: the auxiliary cooling fan starts at full speed, and the software reduces the IPM carrier frequency and limits the compressor output current to reduce the module's own heat generation, achieving a dual effect of "enhanced heat dissipation + heat suppression" to prevent the power module from overheating and being damaged.

[0056] To save energy, in an optional implementation, the above method further includes:

[0057] In step S501, if the junction temperature is lower than the second temperature threshold or the condenser's blockage level decreases within a fourth predetermined time period, the heat sink of the power module is controlled to shut down, and the second temperature threshold is lower than the first temperature threshold.

[0058] In the above embodiments, when the junction temperature of the IPM module drops below the second temperature threshold (e.g., 72°C) and remains below it for a fourth predetermined duration (e.g., 30 seconds), or when the level of dirt blockage decreases, the forced cooling is automatically turned off and the normal operating state is restored.

[0059] To achieve self-cleaning, in one optional implementation, step S204 includes:

[0060] Step S2041: When the condenser is slightly clogged and the cumulative standby time is greater than or equal to the time threshold, light load self-cleaning is triggered, so that the outdoor fan runs at a first predetermined speed for a first cleaning time.

[0061] Step S2042: When the condenser is moderately clogged, a regular self-cleaning process is triggered, causing the outdoor fan to alternate between forward and reverse rotation at the first predetermined speed for the first cleaning duration.

[0062] In step S2043, when the condenser is severely clogged, the radiator of the power module is turned on and the compressor frequency limiting protection and powerful self-cleaning are triggered, so that the outdoor fan runs alternately in forward and reverse rotation at a second predetermined speed for a second cleaning time. The second predetermined speed is greater than the first predetermined speed, and the second cleaning time is greater than the first cleaning time.

[0063] In the above implementation, for minor clogging: after the standby time reaches the target, i.e., greater than or equal to the time threshold, light-load self-cleaning is initiated, and the fan runs at low speed to blow away floating dust using airflow; for moderate clogging: regular self-cleaning is initiated immediately, with the fan running in both forward and reverse directions for the first cleaning time, combined with condenser temperature difference frosting and defrosting (for heat pump air conditioners), to remove medium-thickness dirt; for severe clogging: the IPM module is activated first for forced heat dissipation and compressor frequency limiting protection, and then powerful self-cleaning is triggered, extending the cleaning time to the second cleaning time and increasing the fan speed to the second predetermined speed to thoroughly remove stubborn oil stains and clogging impurities.

[0064] To achieve self-recovery, in one optional implementation, the method further includes:

[0065] Step S601: If the current deviation rate is less than the fourth predetermined threshold during the self-cleaning operation of the air conditioner, control the air conditioner to stop performing the self-cleaning operation. The fourth predetermined threshold is less than the first predetermined threshold.

[0066] Step S602: If the dirt level of the condenser does not decrease after the air conditioner performs self-cleaning operation, the air conditioner performs self-cleaning operation once at a fifth predetermined interval.

[0067] Step S603: If the number of times the above self-cleaning operation is performed is greater than or equal to the predetermined number and the condenser clogging level does not decrease, a fault alert is sent.

[0068] In the above implementation, the fan phase current is monitored in real time during the self-cleaning process. When ΔI falls back to within the fourth predetermined threshold (10%), the cleaning is determined to be completed, the self-cleaning program is automatically stopped, and the air conditioner resumes normal operation. If the level of dirt blockage does not decrease after a single cleaning, a second cleaning is automatically started at a fifth predetermined time interval (e.g., 30 minutes), and the cycle is repeated up to 2 times. That is, the number of self-cleaning operations is greater than or equal to the predetermined number (e.g., 3 times). If the problem is still not improved, a fault reminder is pushed.

[0069] To avoid affecting the user experience, in an optional implementation, step S204 includes:

[0070] Step S2044: If the current time is a high-frequency usage period, delay the self-cleaning operation of the air conditioner to standby mode. The high-frequency usage period is a period in which the historical usage frequency is greater than the predetermined frequency.

[0071] Step S2045: When the current time is in an idle period, control the air conditioner to perform a self-cleaning operation. The idle period is a period other than the high-frequency use period.

[0072] In the above implementation, when the air conditioner is in a period of high user usage, the self-cleaning process is delayed until the standby state is reached; during idle periods, the self-cleaning process is performed first to avoid affecting the user experience.

[0073] To enable those skilled in the art to better understand the technical solution of this application, the implementation process of the self-cleaning control method for air conditioners of this application will be described in detail below with reference to specific embodiments.

[0074] This embodiment relates to a specific self-cleaning control method for an air conditioner, which is an optimized upgrade based on the original hardware of the air conditioner. It mainly includes: 1. Current acquisition unit: a high-precision Hall current sensor / sampling resistor, which collects the three-phase current of the outdoor fan in real time; 2. Temperature acquisition unit: an IPM junction temperature sensor, a condenser temperature sensor, and an outdoor ambient temperature sensor; 3. Main control module: an MCU / DSP chip with built-in algorithms for dirt / clogging detection, forced cooling, and self-cleaning coordinated control; 4. IPM forced cooling unit: an auxiliary cooling fan, a drive relay, and a heat pipe heat spreader assembly (this unit is not present in the comparative patent); 5. Condenser self-cleaning execution unit: a fan forward / reverse drive module and a defrosting control module; 6. Execution protection unit: a compressor frequency adjustment module, a fault alarm module, and a remote communication module; 7. Storage unit: storing reference current, operating parameters, dirt / clogging records, and cleaning records. The self-cleaning control method for the air conditioner includes the following steps:

[0075] 1. Hardware configuration: Hall current sensor is installed in the outdoor fan circuit, IPM module is equipped with auxiliary cooling fan and heat pipe heat sink, STM32 microcontroller is used as the main controller, and self-cleaning and heat dissipation drive circuit is installed.

[0076] 2. Reference Calibration: Under standard cooling conditions, the reference value I of the clean phase current of the fan. ref =4.8A;

[0077] 3. Operational monitoring: After the air conditioner has been running for 4 months, the fan current I is collected in real time. actual =6.3A, ΔI≈31.25%, lasting for 2 minutes, judged as moderate blockage, IPM junction temperature T j =83℃, confirming that dirt blockage is the cause of the temperature rise;

[0078] 4. Synergistic Execution: The IPM auxiliary fan is activated at half speed for forced cooling, the compressor frequency is reduced by 20%, and the condenser's routine self-cleaning is triggered simultaneously, with the fan blowing and defrosting in both forward and reverse directions.

[0079] 5. Cleaning and Recovery: After 12 minutes of self-cleaning operation, check the fan current I. actual =4.7A, ΔI≈-2.1%, IPM junction temperature dropped to 69℃, cleaning and forced cooling stopped, and the air conditioner resumed normal operation.

[0080] This application also provides a self-cleaning control device for an air conditioner. It should be noted that the self-cleaning control device for an air conditioner in this application can be used to execute the self-cleaning control method for an air conditioner provided in this application. This device is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0081] The self-cleaning control device for air conditioners provided in the embodiments of this application will be described below.

[0082] Figure 3 This is a schematic diagram of a self-cleaning control device for an air conditioner according to an embodiment of this application. Figure 3 As shown, the device includes:

[0083] The acquisition unit 10 is used to acquire the current of the outdoor fan of the air conditioner under the current operating condition, to obtain the actual fan current, and to acquire the temperature of the power module of the air conditioner under the current operating condition, to obtain the junction temperature.

[0084] Specifically, during air conditioner operation, the high-precision current acquisition unit of the outdoor unit fan drive circuit collects the three-phase current of the fan in real time. After filtering and noise reduction, the real-time effective value of the current is obtained, which is the actual fan current I. actual Synchronously acquire the junction temperature of the power module (IPM module), i.e., the junction temperature T. j .

[0085] The calculation unit 20 is used to calculate the current deviation rate between the actual fan current and the corresponding reference current, wherein the reference current is the current of the outdoor fan under the current operating conditions when the air conditioner was manufactured.

[0086] Specifically, through To calculate the current deviation rate ΔI, during the initial commissioning of the air conditioner, the three-phase currents of the outdoor fan are collected under different ambient temperatures, operating modes, fan speeds, and cooling / heating conditions, with the condenser clean. The effective values ​​are calculated and stored to establish a multi-condition fan phase current reference database, thus obtaining the reference current I. ref This eliminates the impact of differences in operating conditions on test results.

[0087] The first determining unit 30 is used to determine that the condenser of the air conditioner is clogged when the current deviation rate is greater than or equal to a first predetermined threshold and the junction temperature is greater than or equal to a first temperature threshold.

[0088] Specifically, the current deviation rate is greater than or equal to a first predetermined threshold (e.g., 15%) and the junction temperature is greater than or equal to a first temperature threshold (e.g., 80°C), that is, when ΔI ≥ 15% and T j When the temperature is ≥80℃, the condenser of the above-mentioned air conditioner is determined to be dirty and clogged.

[0089] The first control unit 40 is used to control the air conditioner to perform self-cleaning operations.

[0090] Specifically, the self-cleaning operation is only performed when the air conditioner's condenser is dirty or clogged, based on two indicators: current deviation rate and junction temperature. This prevents the power module from overheating and being damaged.

[0091] In this embodiment, the self-cleaning control device for the air conditioner calculates the current deviation rate between the actual fan current and the corresponding reference current under the current operating condition, and obtains the temperature of the air conditioner's power module under the current operating condition, i.e., the junction temperature. If both the current deviation rate and the junction temperature are greater than or equal to a first predetermined threshold and a first temperature threshold, the air conditioner's condenser can be determined to be clogged. The device then controls the air conditioner to perform self-cleaning operations. By mutually verifying the two indicators, the current deviation rate and the junction temperature, the air conditioner's condenser is determined to be clogged only when both indicators simultaneously meet the corresponding conditions. This avoids misjudgment of condenser clog leading to untimely or excessive cleaning, and prevents the power module from overheating and being damaged. This solves the problem of high misjudgment rate of condenser clog in the prior art.

[0092] To further ensure the accuracy of condenser blockage detection, in one optional implementation, the first determining unit includes:

[0093] The acquisition module is used to acquire the fin temperature of the condenser and the outdoor ambient temperature under the current operating conditions.

[0094] The calculation module is used to calculate the difference between the above-mentioned fin temperature and the above-mentioned outdoor ambient temperature to obtain the heat exchange temperature difference;

[0095] The determination module is used to determine the condenser blockage when the above-mentioned current deviation rate is greater than or equal to a predetermined threshold, the above-mentioned junction temperature is greater than or equal to a first temperature threshold, and the above-mentioned heat exchange temperature difference is greater than or equal to a temperature difference threshold.

[0096] In the above implementation, the current deviation rate ΔI is calculated using the actual fan current, and the junction temperature T of the IPM module is simultaneously collected. j Condenser fin temperature T c Outdoor ambient temperature T env If the heat exchange temperature difference is greater than or equal to the temperature difference threshold, it indicates that the condenser's heat exchange efficiency is poor. For example, if the temperature difference threshold is 12℃, then when T... j ≥80℃ and T c -T env When the temperature rise is ≥12℃, it is confirmed that the abnormal temperature rise of the IPM module is caused by a dirty or clogged condenser, i.e., when ΔI ≥15% and T j ≥80℃ and T c -T env Only when both ≥12℃ are met can it be determined that the condenser is dirty or clogged.

[0097] To determine the level of fouling, in one optional embodiment, the above-mentioned device further includes:

[0098] The second determining unit is used to determine that the condenser is slightly clogged after determining that the condenser of the air conditioner is clogged, and that the current deviation rate within a first predetermined time period is greater than or equal to the first predetermined threshold and less than the second predetermined threshold, and the second predetermined threshold is greater than the first predetermined threshold.

[0099] The third determining unit is used to determine the condenser's fouling level as moderate fouling when the current deviation rate within the second predetermined time period is greater than or equal to the second predetermined threshold and less than the third predetermined threshold, wherein the third predetermined threshold is greater than the second predetermined threshold.

[0100] The fourth determining unit is used to determine that the condenser's fouling level is severe fouling if the current deviation rate is greater than or equal to the third predetermined threshold within a third predetermined time period.

[0101] In the above embodiments, taking a first predetermined duration of 3 minutes, a second predetermined duration of 2 minutes, a third predetermined duration of 1 minute, a first predetermined threshold of 15%, a second predetermined threshold of 30%, and a second predetermined threshold of 50% as examples, the first method combines the current deviation rate and the duration to classify condenser blockage into four levels: Normal state: ΔI < 15%, no blockage or slight dust accumulation, no intervention required; Slight blockage: 15% ≤ ΔI < 30%, duration ≥ 3 minutes, slight blockage of the condenser; Moderate blockage: 30% ≤ ΔI < 50%, duration ≥ 2 minutes, worsening blockage of the condenser; Severe blockage: ΔI ≥ 50%, duration ≥ 1 minute, severe blockage of the condenser.

[0102] To prevent the power module from overheating and being damaged, in one optional embodiment, the above-mentioned device further includes:

[0103] The second control unit is used to control the heat sink of the power module to shut down when the condenser is only slightly clogged.

[0104] The third control unit is used to control the heat sink of the power module to operate at the first speed when the condenser is moderately clogged.

[0105] The fourth control unit is used to control the heat sink of the power module to operate at a second speed when the condenser is severely clogged, wherein the first speed is less than the second speed.

[0106] In the above implementation, for minor blockage: forced cooling is not activated, i.e., the heat sink is not opened, and only conventional passive cooling is maintained; for moderate blockage: the main control module drives the auxiliary cooling fan to run at half speed, and the heat pipe heat sink simultaneously enhances heat conduction to quickly remove the heat from the IPM module; for severe blockage: the auxiliary cooling fan starts at full speed, and the software reduces the IPM carrier frequency and limits the compressor output current to reduce the module's own heat generation, achieving a dual effect of "enhanced heat dissipation + heat suppression" to prevent the power module from overheating and being damaged.

[0107] To save energy, in an optional embodiment, the above-mentioned device further includes:

[0108] The fourth first control unit is used to control the heat sink of the power module to shut down when the junction temperature is less than the second temperature threshold or the dirt blockage level of the condenser decreases within a fourth predetermined time period, wherein the second temperature threshold is less than the first temperature threshold.

[0109] In the above embodiments, when the junction temperature of the IPM module drops below the second temperature threshold (e.g., 72°C) and remains below it for a fourth predetermined duration (e.g., 30 seconds), or when the level of dirt blockage decreases, the forced cooling is automatically turned off and the normal operating state is restored.

[0110] To achieve self-cleaning, in one optional implementation, the first control unit includes:

[0111] The first control module is used to trigger light-load self-cleaning when the condenser is slightly clogged and the cumulative standby time is greater than or equal to the time threshold, so that the outdoor fan runs forward at a first predetermined speed for a first cleaning time.

[0112] The second control module is used to trigger a regular self-cleaning process when the condenser is moderately clogged, so that the outdoor fan runs alternately in forward and reverse rotation at the first predetermined speed for the first cleaning duration.

[0113] The third control module is used to control the radiator of the power module to turn on and trigger the compressor frequency limiting protection and powerful self-cleaning when the condenser is severely clogged. This causes the outdoor fan to run alternately in forward and reverse rotation at a second predetermined speed for a second cleaning time. The second predetermined speed is greater than the first predetermined speed, and the second cleaning time is greater than the first cleaning time.

[0114] In the above implementation, for minor clogging: after the standby time reaches the target, i.e., greater than or equal to the time threshold, light-load self-cleaning is initiated, and the fan runs at low speed to blow away floating dust using airflow; for moderate clogging: regular self-cleaning is initiated immediately, with the fan running in both forward and reverse directions for the first cleaning time, combined with condenser temperature difference frosting and defrosting (for heat pump air conditioners), to remove medium-thickness dirt; for severe clogging: the IPM module is activated first for forced heat dissipation and compressor frequency limiting protection, and then powerful self-cleaning is triggered, extending the cleaning time to the second cleaning time and increasing the fan speed to the second predetermined speed to thoroughly remove stubborn oil stains and clogging impurities.

[0115] To achieve self-recovery, in one optional embodiment, the above-mentioned device further includes:

[0116] The fifth control unit is used to control the air conditioner to stop performing the self-cleaning operation when the current deviation rate is less than the fourth predetermined threshold during the self-cleaning operation of the air conditioner, wherein the fourth predetermined threshold is less than the first predetermined threshold.

[0117] The sixth control unit is used to perform the air conditioner self-cleaning operation once at a fifth predetermined interval if the dirt level of the condenser does not decrease after the air conditioner performs the self-cleaning operation.

[0118] The sending unit is used to send a fault alert when the number of times the above self-cleaning operation is performed is greater than or equal to a predetermined number and the level of dirt and blockage of the condenser has not decreased.

[0119] In the above implementation, the fan phase current is monitored in real time during the self-cleaning process. When ΔI falls back to within the fourth predetermined threshold (10%), the cleaning is determined to be completed, the self-cleaning program is automatically stopped, and the air conditioner resumes normal operation. If the level of dirt blockage does not decrease after a single cleaning, a second cleaning is automatically started at a fifth predetermined time interval (e.g., 30 minutes), and the cycle is repeated up to 2 times. That is, the number of self-cleaning operations is greater than or equal to the predetermined number (e.g., 3 times). If the problem is still not improved, a fault reminder is pushed.

[0120] To avoid affecting the user experience, in one optional implementation, the first control unit includes:

[0121] The fourth control module is used to delay the self-cleaning operation of the air conditioner until it is in standby mode when the current time is a high-frequency usage period. The high-frequency usage period is a period when the historical usage frequency is greater than the predetermined frequency.

[0122] The fifth control module is used to control the air conditioner to perform a self-cleaning operation when the current time is an idle period, which is a period other than the high-frequency use period.

[0123] In the above implementation, when the air conditioner is in a period of high user usage, the self-cleaning process is delayed until the standby state is reached; during idle periods, the self-cleaning process is performed first to avoid affecting the user experience.

[0124] The self-cleaning control device of the aforementioned air conditioner includes a processor and a memory. The aforementioned acquisition unit, calculation unit, first determination unit, and first control unit are all stored as program units in the memory, and the processor executes the aforementioned program units stored in the memory to achieve the corresponding functions. All of the above modules are located in the same processor; or, the above modules are located in different processors in any combination.

[0125] The processor contains a kernel, which retrieves the corresponding program units from memory. One or more kernels can be configured, and adjusting kernel parameters can address the high false alarm rate of condenser clogging in existing air conditioners.

[0126] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0127] This invention provides a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the self-cleaning control method of the air conditioner.

[0128] Specifically, the self-cleaning control methods for air conditioners include:

[0129] Step S201: Obtain the current of the outdoor fan of the air conditioner under the current operating condition to obtain the actual fan current; obtain the temperature of the power module of the air conditioner under the current operating condition to obtain the junction temperature.

[0130] Specifically, during air conditioner operation, the high-precision current acquisition unit of the outdoor unit fan drive circuit collects the three-phase current of the fan in real time. After filtering and noise reduction, the real-time effective value of the current is obtained, which is the actual fan current I. actual Synchronously acquire the junction temperature of the power module (IPM module), i.e., the junction temperature T. j .

[0131] Step S202: Calculate the current deviation rate between the actual fan current and the corresponding reference current. The reference current is the current of the outdoor fan under the current operating conditions when the air conditioner was manufactured.

[0132] Specifically, through To calculate the current deviation rate ΔI, during the initial commissioning of the air conditioner, the three-phase currents of the outdoor fan are collected under different ambient temperatures, operating modes, fan speeds, and cooling / heating conditions, with the condenser clean. The effective values ​​are calculated and stored to establish a multi-condition fan phase current reference database, thus obtaining the reference current I. ref This eliminates the impact of differences in operating conditions on test results.

[0133] Step S203: If the current deviation rate is greater than or equal to a first predetermined threshold and the junction temperature is greater than or equal to a first temperature threshold, the condenser of the air conditioner is determined to be clogged.

[0134] Specifically, the current deviation rate is greater than or equal to a first predetermined threshold (e.g., 15%) and the junction temperature is greater than or equal to a first temperature threshold (e.g., 80°C), that is, when ΔI ≥ 15% and T j When the temperature is ≥80℃, the condenser of the above-mentioned air conditioner is determined to be dirty and clogged.

[0135] Step S204: Control the air conditioner to perform self-cleaning operation.

[0136] Specifically, the self-cleaning operation is only performed when the air conditioner's condenser is dirty or clogged, based on two indicators: current deviation rate and junction temperature. This prevents the power module from overheating and being damaged.

[0137] This invention provides a processor for running a program, wherein the program executes the self-cleaning control method of the air conditioner.

[0138] Specifically, the self-cleaning control methods for air conditioners include:

[0139] Step S201: Obtain the current of the outdoor fan of the air conditioner under the current operating condition to obtain the actual fan current; obtain the temperature of the power module of the air conditioner under the current operating condition to obtain the junction temperature.

[0140] Specifically, during air conditioner operation, the high-precision current acquisition unit of the outdoor unit fan drive circuit collects the three-phase current of the fan in real time. After filtering and noise reduction, the real-time effective value of the current is obtained, which is the actual fan current I. actual Synchronously acquire the junction temperature of the power module (IPM module), i.e., the junction temperature T. j .

[0141] Step S202: Calculate the current deviation rate between the actual fan current and the corresponding reference current. The reference current is the current of the outdoor fan under the current operating conditions when the air conditioner was manufactured.

[0142] Specifically, through To calculate the current deviation rate ΔI, during the initial commissioning of the air conditioner, the three-phase currents of the outdoor fan are collected under different ambient temperatures, operating modes, fan speeds, and cooling / heating conditions, with the condenser clean. The effective values ​​are calculated and stored to establish a multi-condition fan phase current reference database, thus obtaining the reference current I. ref This eliminates the impact of differences in operating conditions on test results.

[0143] Step S203: If the current deviation rate is greater than or equal to a first predetermined threshold and the junction temperature is greater than or equal to a first temperature threshold, the condenser of the air conditioner is determined to be clogged.

[0144] Specifically, the current deviation rate is greater than or equal to a first predetermined threshold (e.g., 15%) and the junction temperature is greater than or equal to a first temperature threshold (e.g., 80°C), that is, when ΔI ≥ 15% and T j When the temperature is ≥80℃, the condenser of the above-mentioned air conditioner is determined to be dirty and clogged.

[0145] Step S204: Control the air conditioner to perform self-cleaning operation.

[0146] Specifically, the self-cleaning operation is only performed when the air conditioner's condenser is dirty or clogged, based on two indicators: current deviation rate and junction temperature. This prevents the power module from overheating and being damaged.

[0147] This invention provides a device including a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs at least the following steps:

[0148] Step S201: Obtain the current of the outdoor fan of the air conditioner under the current operating condition to obtain the actual fan current; obtain the temperature of the power module of the air conditioner under the current operating condition to obtain the junction temperature.

[0149] Specifically, during air conditioner operation, the high-precision current acquisition unit of the outdoor unit fan drive circuit collects the three-phase current of the fan in real time. After filtering and noise reduction, the real-time effective value of the current is obtained, which is the actual fan current I. actual Synchronously acquire the junction temperature of the power module (IPM module), i.e., the junction temperature T. j .

[0150] Step S202: Calculate the current deviation rate between the actual fan current and the corresponding reference current. The reference current is the current of the outdoor fan under the current operating conditions when the air conditioner was manufactured.

[0151] Specifically, through To calculate the current deviation rate ΔI, during the initial commissioning of the air conditioner, the three-phase currents of the outdoor fan are collected under different ambient temperatures, operating modes, fan speeds, and cooling / heating conditions, with the condenser clean. The effective values ​​are calculated and stored to establish a multi-condition fan phase current reference database, thus obtaining the reference current I. ref This eliminates the impact of differences in operating conditions on test results.

[0152] Step S203: If the current deviation rate is greater than or equal to a first predetermined threshold and the junction temperature is greater than or equal to a first temperature threshold, the condenser of the air conditioner is determined to be clogged.

[0153] Specifically, the current deviation rate is greater than or equal to a first predetermined threshold (e.g., 15%) and the junction temperature is greater than or equal to a first temperature threshold (e.g., 80°C), that is, when ΔI ≥ 15% and T j When the temperature is ≥80℃, the condenser of the above-mentioned air conditioner is determined to be dirty and clogged.

[0154] Step S204: Control the air conditioner to perform self-cleaning operation.

[0155] Specifically, the self-cleaning operation is only performed when the air conditioner's condenser is dirty or clogged, based on two indicators: current deviation rate and junction temperature. This prevents the power module from overheating and being damaged.

[0156] This application also provides a computer program product, which, when executed on a data processing device, is suitable for executing an initialization program having at least the following method steps:

[0157] Step S201: Obtain the current of the outdoor fan of the air conditioner under the current operating condition to obtain the actual fan current; obtain the temperature of the power module of the air conditioner under the current operating condition to obtain the junction temperature.

[0158] Specifically, during air conditioner operation, the high-precision current acquisition unit of the outdoor unit fan drive circuit collects the three-phase current of the fan in real time. After filtering and noise reduction, the real-time effective value of the current is obtained, which is the actual fan current I. actual Synchronously acquire the junction temperature of the power module (IPM module), i.e., the junction temperature T. j .

[0159] Step S202: Calculate the current deviation rate between the actual fan current and the corresponding reference current. The reference current is the current of the outdoor fan under the current operating conditions when the air conditioner was manufactured.

[0160] Specifically, through To calculate the current deviation rate ΔI, during the initial commissioning of the air conditioner, the three-phase currents of the outdoor fan are collected under different ambient temperatures, operating modes, fan speeds, and cooling / heating conditions, with the condenser clean. The effective values ​​are calculated and stored to establish a multi-condition fan phase current reference database, thus obtaining the reference current I. ref This eliminates the impact of differences in operating conditions on test results.

[0161] Step S203: If the current deviation rate is greater than or equal to a first predetermined threshold and the junction temperature is greater than or equal to a first temperature threshold, the condenser of the air conditioner is determined to be clogged.

[0162] Specifically, the current deviation rate is greater than or equal to a first predetermined threshold (e.g., 15%) and the junction temperature is greater than or equal to a first temperature threshold (e.g., 80°C), that is, when ΔI ≥ 15% and T j When the temperature is ≥80℃, the condenser of the above-mentioned air conditioner is determined to be dirty and clogged.

[0163] Step S204: Control the air conditioner to perform self-cleaning operation.

[0164] Specifically, the self-cleaning operation is only performed when the air conditioner's condenser is dirty or clogged, based on two indicators: current deviation rate and junction temperature. This prevents the power module from overheating and being damaged.

[0165] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0166] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0167] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0168] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0169] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0170] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0171] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, like read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0172] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0173] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0174] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0175] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0176] 1) In the self-cleaning control method of the air conditioner in this application, the current deviation rate between the actual fan current and the corresponding reference current under the current operating condition is calculated, and the temperature of the power module of the air conditioner under the current operating condition, i.e., the junction temperature, is obtained. When both the current deviation rate and the junction temperature are greater than or equal to the first predetermined threshold and the first temperature threshold are satisfied, the condenser of the air conditioner can be determined to be dirty and clogged. Then, the air conditioner is controlled to perform self-cleaning operation. The current deviation rate and the junction temperature are mutually verified. Only when both indicators meet the corresponding conditions at the same time can the condenser of the air conditioner be determined to be dirty and clogged. This avoids the misjudgment of condenser dirt blockage, which may lead to untimely or excessive cleaning, and avoids the power module from overheating and being damaged. This solves the problem of high misjudgment rate of condenser dirt blockage in the prior art.

[0177] 2) This application uses the fan phase current as the core parameter, combined with temperature rise correlation verification, to achieve fast detection response and a false judgment rate of less than 5%, realizing early classification judgment of dirt blockage; the reliability of the IPM module is greatly improved: active graded forced heat dissipation + software damage control suppresses module temperature rise from the source, avoids high temperature stress damage, extends the service life of the IPM module by more than 30%, and reduces the failure rate by more than 60%; self-cleaning intelligent on-demand operation: linking dirt blockage level, IPM temperature rise and usage scenario, the three-level cleaning mode is accurately adapted to avoid over-cleaning or untimely cleaning, saves energy and reduces consumption, and improves the cleaning effect by 40%. It builds a closed loop of detection, heat dissipation, cleaning and protection, completely solves a series of faults caused by condenser dirt blockage, extends the overall life of the air conditioner, does not require major changes to the original air conditioner architecture, only adds simple components, the software algorithm can be directly embedded into the existing control system, adapts to various air conditioning equipment, and has high industrialization value.

[0178] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A self-cleaning control method for an air conditioner, characterized in that, include: Obtain the current of the outdoor fan of the air conditioner under the current operating condition to obtain the actual fan current; obtain the temperature of the power module of the air conditioner under the current operating condition to obtain the junction temperature. Calculate the current deviation rate between the actual fan current and the corresponding reference current, where the reference current is the current of the outdoor fan under the current operating conditions when the air conditioner was manufactured. If the current deviation rate is greater than or equal to a first predetermined threshold and the junction temperature is greater than or equal to a first temperature threshold, it is determined that the condenser of the air conditioner is clogged. Control the air conditioner to perform a self-cleaning operation.

2. The method according to claim 1, characterized in that, Determining that the condenser of the air conditioner is clogged when the current deviation rate is greater than or equal to a first predetermined threshold and the junction temperature is greater than or equal to a first temperature threshold includes: Obtain the fin temperature of the condenser and the outdoor ambient temperature under the current operating conditions; The heat exchange temperature difference is obtained by calculating the difference between the fin temperature and the outdoor ambient temperature. If the current deviation rate is greater than or equal to a predetermined threshold, the junction temperature is greater than or equal to a first temperature threshold, and the heat exchange temperature difference is greater than or equal to a temperature difference threshold, the condenser is determined to be clogged.

3. The method according to claim 1, characterized in that, After determining that the condenser of the air conditioner is clogged, the method further includes: If the current deviation rate is greater than or equal to the first predetermined threshold and less than the second predetermined threshold within a first predetermined time period, the condenser is determined to be slightly clogged, and the second predetermined threshold is greater than the first predetermined threshold. If the current deviation rate is greater than or equal to the second predetermined threshold and less than the third predetermined threshold within the second predetermined time period, the condenser is determined to be moderately clogged, and the third predetermined threshold is greater than the second predetermined threshold. If the current deviation rate is greater than or equal to the third predetermined threshold within a third predetermined time period, the condenser is determined to be severely clogged.

4. The method according to claim 3, characterized in that, The method further includes: If the condenser is only slightly clogged, the heat sink of the power module will be shut off. When the condenser is moderately clogged, the radiator of the power module is controlled to operate at a first speed. When the condenser is severely clogged, the power module's radiator is controlled to operate at a second speed, where the first speed is less than the second speed.

5. The method according to claim 4, characterized in that, The method further includes: If the junction temperature is lower than the second temperature threshold or the condenser's fouling level decreases within a fourth predetermined time period, the power module's heat sink will be shut off, where the second temperature threshold is lower than the first temperature threshold.

6. The method according to any one of claims 1 to 5, characterized in that, Controlling the air conditioner to perform a self-cleaning operation includes: When the condenser is slightly clogged and the cumulative standby time is greater than or equal to the time threshold, a light-load self-cleaning is triggered, causing the outdoor fan to run at a first predetermined speed for a first cleaning time. When the condenser is moderately clogged, a regular self-cleaning process is triggered, causing the outdoor fan to alternate between forward and reverse rotation at the first predetermined speed for the first cleaning duration. When the condenser is severely clogged, the power module's radiator is turned on, triggering the compressor's frequency limiting protection and powerful self-cleaning. This causes the outdoor fan to alternate between forward and reverse rotation at a second predetermined speed for a second cleaning duration. The second predetermined speed is greater than the first predetermined speed, and the second cleaning duration is greater than the first cleaning duration.

7. The method according to claim 6, characterized in that, The method further includes: If the current deviation rate is less than a fourth predetermined threshold during the self-cleaning operation of the air conditioner, the air conditioner is controlled to stop performing the self-cleaning operation, where the fourth predetermined threshold is less than the first predetermined threshold. If the level of dirt and blockage in the condenser does not decrease after the air conditioner performs a self-cleaning operation, the air conditioner shall perform a self-cleaning operation once at a fifth predetermined interval. If the number of self-cleaning operations performed is greater than or equal to a predetermined number and the level of dirt and clogging in the condenser does not decrease, a fault alert will be sent.

8. The method according to claim 1, characterized in that, Controlling the air conditioner to perform a self-cleaning operation includes: If the current time is a high-frequency usage period, the self-cleaning operation of the air conditioner will be delayed until the standby state. The high-frequency usage period is a period in which the historical usage frequency is greater than the predetermined frequency. When the current time is during an idle period, the air conditioner is controlled to perform a self-cleaning operation. The idle period is a period other than the high-frequency usage period.

9. A self-cleaning control device for an air conditioner, characterized in that, include: The acquisition unit is used to acquire the current of the outdoor fan of the air conditioner under the current operating condition, to obtain the actual fan current, and to acquire the temperature of the power module of the air conditioner under the current operating condition, to obtain the junction temperature. The calculation unit is used to calculate the current deviation rate between the actual fan current and the corresponding reference current, wherein the reference current is the current of the outdoor fan under the current operating condition when the air conditioner was manufactured. The first determining unit is configured to determine that the condenser of the air conditioner is clogged when the current deviation rate is greater than or equal to a first predetermined threshold and the junction temperature is greater than or equal to a first temperature threshold. The first control unit is used to control the air conditioner to perform a self-cleaning operation.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method described in any one of claims 1 to 8.

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