Air conditioner and control method and device thereof, storage medium and computer program product

Abstract

The invention discloses an air conditioner control method and device, an air conditioner, a storage medium and a computer program product, the air conditioner is provided with an outdoor unit and an indoor unit, the outdoor unit is provided with a compressor, and the indoor unit is provided with an indoor heat exchanger; the control method of the air conditioner comprises the steps that under the condition that the air conditioner runs in a refrigeration mode or a dehumidification mode after being started, the running time of a compressor is timed, and the accumulated running time of the compressor is obtained; operation parameters of the air conditioner are obtained; and after the accumulative operation time of the compressor reaches the preset initial operation time, anti-frosting protection is conducted on the indoor heat exchanger according to the change condition of the operation parameters of the air conditioner. According to the scheme, the frosting condition of the indoor unit is accurately judged according to the change condition of the operation parameters of the air conditioner, and reliable anti-frosting protection is conducted on the indoor unit.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning, and specifically relates to a control method, device, air conditioner, storage medium and computer program product for an air conditioner, and more particularly to a novel control method, device, air conditioner, storage medium and computer program product for preventing frost on an indoor unit. Background Art

[0002] In related solutions, the control method for preventing frost on indoor air conditioners (such as residential air conditioners) primarily involves detecting the evaporator temperature via the evaporator's temperature sensor. When the detected temperature falls below 1°C, the indoor unit is deemed frosted and enters anti-frost protection. This simple detection method has a drawback: if frost forms on certain evaporator branches while the evaporator's temperature sensor remains free, the temperature detected by the sensor exceeds 1°C. The system logic will determine that the indoor unit is not frosted and will not enter anti-frost protection, rendering the anti-frost logic ineffective.

[0003] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0004] The object of the present invention is to provide a control method, device, air conditioner, storage medium and computer program product for an air conditioner, so as to solve the problem that when an air conditioner (such as a household air conditioner) prevents the indoor unit from frosting, the indoor unit is judged to be frosted based on the evaporator temperature detected by the indoor unit evaporator temperature sensing package, but when some branches of the evaporator are frosted and the evaporator temperature sensing package shows no frost, the evaporator temperature detection is inaccurate, resulting in the failure of anti-frost protection, so as to achieve the effect of accurately judging the frosting condition of the indoor unit according to the changes in the operating parameters of the air conditioner, and reliably protecting the indoor unit from frost.

[0005] The present invention provides a method for controlling an air conditioner, wherein the air conditioner has an outdoor unit and an indoor unit, the outdoor unit has a compressor, and the indoor unit has an indoor heat exchanger; the method for controlling the air conditioner comprises: when the air conditioner is turned on and operates in a cooling mode or a dehumidification mode, timing the operating time of the compressor to obtain the accumulated operating time of the compressor; and obtaining operating parameters of the air conditioner; after the accumulated operating time of the compressor reaches a preset initial operating time, performing anti-frost protection on the indoor heat exchanger according to changes in the operating parameters of the air conditioner.

[0006] In some embodiments, the outdoor unit further has a throttling device, and the indoor unit further has an indoor fan; the operating parameters of the air conditioner include: the frequency of the compressor, the suction temperature of the compressor, the wind speed of the indoor fan, the pipe temperature of the indoor heat exchanger, and the opening of the throttling device; after the cumulative running time of the compressor reaches the preset initial running time, the indoor heat exchanger is protected from frost according to the changes in the operating parameters of the air conditioner, including: after the cumulative running time of the compressor reaches the preset initial running time, according to the frequency of the compressor and the wind speed of the indoor fan, determining whether to start executing the preset anti-frost logic; if it is determined to start executing the preset anti-frost logic, then based on the pipe temperature of the indoor heat exchanger, and in combination with at least one of the opening of the throttling device and the suction temperature of the compressor, the preset anti-frost logic is executed to achieve anti-frost protection for the indoor unit.

[0007] In some embodiments, after the cumulative running time of the compressor reaches the preset initial running time, it is determined whether to start executing the preset anti-frost logic based on the frequency of the compressor and the wind speed of the indoor fan, including: after the cumulative running time of the compressor reaches the preset initial running time, according to the frequency of the compressor, within a first set time, determining the change in the frequency of the compressor; and according to the wind speed of the indoor fan, within a first set time, determining the change in the wind speed of the indoor fan; determining whether the change in the frequency of the compressor is within a preset frequency change range and the change in the wind speed of the indoor fan is within a preset wind speed change range; if it is determined that it is satisfied, it is determined to start executing the preset anti-frost logic, and the cumulative running time of the compressor is cleared.

[0008] In some embodiments, based on the pipe temperature of the indoor heat exchanger, and in combination with at least one of the opening of the throttling device and the suction temperature of the compressor, a preset anti-frost logic is executed to achieve anti-frost protection for the indoor unit, including: determining whether the pipe temperature of the indoor heat exchanger is less than or equal to 0; if it is determined that the pipe temperature of the indoor heat exchanger is less than or equal to 0, executing the preset anti-frost logic: controlling the compressor to stop, to achieve anti-frost protection for the indoor unit; if it is determined that the pipe temperature of the indoor heat exchanger is greater than 0, in combination with at least one of the opening of the throttling device and the suction temperature of the compressor, executing the preset anti-frost logic to achieve anti-frost protection for the indoor unit.

[0009] In some embodiments, in combination with at least one of the opening of the throttling device and the suction temperature of the compressor, a preset anti-frost logic is executed to implement anti-frost protection for the indoor unit, including: determining the change in the opening of the throttling device within a second set time based on the opening of the throttling device; wherein the second set time is greater than the first set time; determining whether the change in the opening of the throttling device is greater than 0; if it is determined that the change in the opening of the throttling device is greater than 0, determining not to execute the preset anti-frost logic, and controlling the air conditioner to maintain the current operation; if it is determined that the change in the opening of the throttling device is less than or equal to 0, executing the preset anti-frost logic in combination with the suction temperature of the compressor to implement anti-frost protection for the indoor unit.

[0010] In some embodiments, in combination with the suction temperature of the compressor, a preset anti-frost logic is executed to implement anti-frost protection for the indoor unit, including: determining the difference between the suction temperature of the compressor and the pipe temperature of the indoor heat exchanger, recorded as the superheat of the indoor heat exchanger; determining whether the superheat of the indoor heat exchanger is greater than or equal to a preset normal superheat; if it is determined that the superheat of the indoor heat exchanger is greater than or equal to the preset normal superheat, determining not to execute the preset anti-frost logic, and controlling the air conditioner to maintain the current operation; if it is determined that the superheat of the indoor heat exchanger is less than the preset normal superheat, then executing the preset anti-frost logic again according to the pipe temperature of the indoor heat exchanger to implement anti-frost protection for the indoor unit.

[0011] In some embodiments, the preset anti-frost logic is executed again based on the pipe temperature of the indoor heat exchanger to implement anti-frost protection for the indoor unit, including: determining the change in the pipe temperature of the indoor heat exchanger within a third set time based on the pipe temperature of the indoor heat exchanger; determining whether the change in the pipe temperature of the indoor heat exchanger is greater than or equal to the preset pipe temperature change; if it is determined that the change in the pipe temperature of the indoor heat exchanger is greater than or equal to the preset pipe temperature change, executing the preset anti-frost logic: controlling the compressor to stop to implement anti-frost protection for the indoor unit; if it is determined that the change in the pipe temperature of the indoor heat exchanger is less than the preset pipe temperature change, determining not to execute the preset anti-frost logic, and controlling the air conditioner to maintain current operation.

[0012] Matching the above method, the present invention provides a control device for an air conditioner on the other hand, the air conditioner having an outdoor unit and an indoor unit, the outdoor unit having a compressor, and the indoor unit having an indoor heat exchanger; the control device for the air conditioner includes: an acquisition unit, configured to time the running time of the compressor when the air conditioner is turned on and running in cooling mode or dehumidification mode, to obtain the cumulative running time of the compressor; and to obtain the operating parameters of the air conditioner; a control unit, configured to perform anti-frost protection on the indoor heat exchanger according to changes in the operating parameters of the air conditioner after the cumulative running time of the compressor reaches a preset initial running time.

[0013] In some embodiments, the outdoor unit further has a throttling device, and the indoor unit further has an indoor fan; the operating parameters of the air conditioner include: the frequency of the compressor, the suction temperature of the compressor, the wind speed of the indoor fan, the pipe temperature of the indoor heat exchanger, and the opening of the throttling device; the control unit performs anti-frost protection on the indoor heat exchanger according to changes in the operating parameters of the air conditioner after the cumulative running time of the compressor reaches the preset initial running time, including: after the cumulative running time of the compressor reaches the preset initial running time, determining whether to start executing the preset anti-frost logic according to the frequency of the compressor and the wind speed of the indoor fan; if it is determined to start executing the preset anti-frost logic, then based on the pipe temperature of the indoor heat exchanger, and in combination with at least one of the opening of the throttling device and the suction temperature of the compressor, the preset anti-frost logic is executed to achieve anti-frost protection for the indoor unit.

[0014] In some embodiments, the control unit determines whether to start executing the preset anti-frost logic based on the frequency of the compressor and the wind speed of the indoor fan after the cumulative running time of the compressor reaches the preset initial running time, including: after the cumulative running time of the compressor reaches the preset initial running time, determining the change in the frequency of the compressor within a first set time based on the frequency of the compressor; and determining the change in the wind speed of the indoor fan within a first set time based on the wind speed of the indoor fan; determining whether the change in the frequency of the compressor is within a preset frequency change range and the change in the wind speed of the indoor fan is within a preset wind speed change range; if it is determined that the conditions are met, determining to start executing the preset anti-frost logic and clearing the cumulative running time of the compressor.

[0015] In some embodiments, the control unit executes a preset anti-frost logic based on the pipe temperature of the indoor heat exchanger and in combination with at least one of the opening of the throttling device and the suction temperature of the compressor to achieve anti-frost protection for the indoor unit, including: determining whether the pipe temperature of the indoor heat exchanger is less than or equal to 0; if it is determined that the pipe temperature of the indoor heat exchanger is less than or equal to 0, executing the preset anti-frost logic: controlling the compressor to stop to achieve anti-frost protection for the indoor unit; if it is determined that the pipe temperature of the indoor heat exchanger is greater than 0, then in combination with at least one of the opening of the throttling device and the suction temperature of the compressor, executing the preset anti-frost logic to achieve anti-frost protection for the indoor unit.

[0016] In some embodiments, the control unit, in combination with at least one of the opening of the throttling device and the suction temperature of the compressor, executes a preset anti-frost logic to achieve anti-frost protection for the indoor unit, including: determining the change in the opening of the throttling device within a second set time based on the opening of the throttling device; wherein the second set time is greater than the first set time; determining whether the change in the opening of the throttling device is greater than 0; if it is determined that the change in the opening of the throttling device is greater than 0, determining not to execute the preset anti-frost logic, and controlling the air conditioner to maintain the current operation; if it is determined that the change in the opening of the throttling device is less than or equal to 0, executing the preset anti-frost logic in combination with the suction temperature of the compressor to achieve anti-frost protection for the indoor unit.

[0017] In some embodiments, the control unit, in combination with the suction temperature of the compressor, executes a preset anti-frost logic to achieve anti-frost protection for the indoor unit, including: determining the difference between the suction temperature of the compressor and the pipe temperature of the indoor heat exchanger, recorded as the superheat of the indoor heat exchanger; determining whether the superheat of the indoor heat exchanger is greater than or equal to a preset normal superheat; if it is determined that the superheat of the indoor heat exchanger is greater than or equal to the preset normal superheat, then determining not to execute the preset anti-frost logic, and controlling the air conditioner to maintain the current operation; if it is determined that the superheat of the indoor heat exchanger is less than the preset normal superheat, then again executing the preset anti-frost logic according to the pipe temperature of the indoor heat exchanger to achieve anti-frost protection for the indoor unit.

[0018] In some embodiments, the control unit again executes a preset anti-frost logic based on the pipe temperature of the indoor heat exchanger to implement anti-frost protection for the indoor unit, including: determining the change in the pipe temperature of the indoor heat exchanger within a third set time based on the pipe temperature of the indoor heat exchanger; determining whether the change in the pipe temperature of the indoor heat exchanger is greater than or equal to a preset pipe temperature change; if it is determined that the change in the pipe temperature of the indoor heat exchanger is greater than or equal to the preset pipe temperature change, executing the preset anti-frost logic: controlling the compressor to stop to implement anti-frost protection for the indoor unit; if it is determined that the change in the pipe temperature of the indoor heat exchanger is less than the preset pipe temperature change, determining not to execute the preset anti-frost logic, and controlling the air conditioner to maintain current operation.

[0019] Matching the above device, the present invention further provides an air conditioner, comprising: the control device of the air conditioner described above.

[0020] In accordance with the above method, the present invention further provides a storage medium, which includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the steps of the above-mentioned air conditioning control method.

[0021] In accordance with the above method, the present invention further provides a computer program product, comprising a computer program, which implements the steps of the above air conditioner control method when executed by a processor.

[0022] Therefore, the solution of the present invention, by timing the running time of the compressor when the air conditioner is turned on and running in cooling mode or dehumidification mode, detects the air conditioner operating parameters such as the frequency of the compressor, the suction temperature of the compressor, the gear of the indoor fan, the temperature of the indoor unit temperature sensor, the change in the opening of the electronic expansion valve within the anti-freezing judgment time, and the change in the internal pipe temperature within the anti-freezing judgment time, accurately determines the frost condition of the indoor unit according to the changes in the air conditioner operating parameters, and performs anti-frost protection when it is determined that the indoor unit is frosted; thus, by accurately determining the frost condition of the indoor unit according to the changes in the air conditioner operating parameters, the indoor unit can be reliably protected from frost.

[0023] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention.

[0024] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A flow chart of an embodiment of a method for controlling an air conditioner according to the present invention;

[0026] Figure 2 1 is a flow chart of an embodiment of the method of the present invention for performing anti-frost protection on the indoor heat exchanger according to changes in the operating parameters of the air conditioner;

[0027] Figure 3 1. A flow chart of an embodiment of the method of the present invention for determining whether to start executing a preset anti-frost logic according to the frequency of the compressor and the wind speed of the indoor fan;

[0028] Figure 4 1 is a flow chart of an embodiment of the method of the present invention for implementing anti-frost protection for the indoor unit according to the tube temperature of the indoor heat exchanger;

[0029] Figure 5 A flow chart of an embodiment of the method of the present invention for realizing anti-frost protection for the indoor unit in combination with the opening degree of the throttling device;

[0030] Figure 6 This is a flow chart of an embodiment of the method of the present invention for implementing anti-frost protection for the indoor unit in combination with the suction temperature of the compressor;

[0031] Figure 7 1. It is a flow chart of an embodiment of the method of the present invention for implementing anti-frost protection for the indoor unit according to the variation of the tube temperature of the indoor heat exchanger;

[0032] Figure 8 A schematic structural diagram of an embodiment of an air conditioner control device of the present invention;

[0033] Figure 9 The figure is a flow chart of a novel control method for preventing frost on an indoor unit according to the present invention.

[0034] In conjunction with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0035] 102 - acquisition unit; 104 - control unit. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] Considering that in the relevant schemes, when air conditioners (such as household air conditioners) prevent the indoor unit from frost, the indoor unit evaporator temperature sensor detects the evaporator temperature to determine whether the indoor unit is frosted. However, when some branches of the evaporator are frosted and the evaporator temperature sensor shows no frost, the evaporator temperature detection is inaccurate, resulting in the failure of anti-frost. Because in the relevant schemes, household air conditioners are designed to have multiple flow paths in order to maximize the cooling capacity of the indoor unit evaporator, and the indoor unit evaporator temperature sensor can only be welded to a certain flow path. Therefore, the indoor unit temperature sensor cannot sense the temperature of all the evaporator flow paths. When the flow path where the evaporator temperature sensor is located is not frosted, the evaporator cannot enter the anti-freeze protection in time.

[0038] For example: Some schemes disclose an evaporator anti-freezing control method, which only uses a few sets of preset temperature sensor temperatures T, T1, and T2 to judge the overheating and frosting condition of the evaporator. It does not take into account the temperature changes of the temperature sensor that may be caused by changes in indoor ambient temperature, compressor frequency, and indoor windshield. It is easy to misjudge the occurrence of evaporator frosting problems.

[0039] Some solutions also monitor condenser tube temperature, increase the condenser temperature change rate, and then combine the evaporator tube temperature and condenser tube temperature change rate to comprehensively determine whether anti-freeze protection conditions have been met. This avoids misjudgments caused by judging only by evaporator temperature and improves the accuracy of anti-freeze control. External tube temperature changes are related to the operation of the entire system, and temperature parameter changes have a relative lag, which cannot reflect the frosting status of the internal evaporator in real time.

[0040] Extensive experimental verification and theoretical analysis have shown that frosting on the indoor evaporator can be categorized into two main scenarios: The first occurs during normal operation, when the indoor evaporator's evaporating temperature is too low, below 1°C and lower than the dew point of the internal environment. This can lead to heavy frost forming on the indoor unit. In this case, the anti-freeze logic in the relevant solution can detect frosting and initiate anti-freeze protection in a timely manner. The second scenario occurs when, under unusual circumstances, such as low internal humidity or slight refrigerant leaks from long-term use, the evaporator experiences uneven liquid distribution. This results in significant temperature variations across the evaporator's flow paths, with some paths frosting while others remain. In these cases, the anti-freeze logic in the relevant solution cannot detect this, resulting in anti-freeze failure.

[0041] Therefore, the solution of the present invention proposes a control method for air conditioning, specifically a new control method for preventing frost on the indoor unit. It proposes a new logic based on the relevant solution, that is, by collecting the operating parameters of the air conditioner and accurately judging the frost condition of the indoor unit through the changes in relevant parameters in the operating parameters, thereby solving the pain point problem of frosting of the indoor unit of the household air conditioner but no protection, and improving the reliability of anti-frost of the indoor unit of the air conditioner.

[0042] According to an embodiment of the present invention, a method for controlling an air conditioner is provided. Figure 1 The flow chart of an embodiment of the method of the present invention is shown. The air conditioner comprises an outdoor unit and an indoor unit, wherein the outdoor unit comprises a compressor, and the indoor unit comprises an indoor heat exchanger. Of course, the outdoor unit also comprises an outdoor heat exchanger. A temperature sensing package is provided on the indoor heat exchanger for obtaining the pipe temperature T of the indoor heat exchanger. 内管 In the solution of the present invention, Figure 1 As shown, the air conditioner control method includes: steps S110 to S120.

[0043] In step S110, when the air conditioner is turned on and runs in cooling mode or dehumidification mode, the running time of the compressor is timed to obtain the accumulated running time of the compressor; and when the air conditioner runs in cooling mode or dehumidification mode, the operating parameters of the air conditioner are obtained.

[0044] In step S120, after the cumulative operating time of the compressor reaches a preset initial operating time, anti-frost protection is performed on the indoor heat exchanger according to changes in operating parameters of the air conditioner.

[0045] The solution of the present invention proposes a new control scheme for preventing frost on the indoor unit. By collecting the operating parameters of the air conditioner and the changes in related parameters in the operating parameters, the frost condition of the indoor unit is accurately determined, thereby solving the pain point problem of frosting of the indoor unit of the household air conditioner but no protection.

[0046] In some embodiments, the outdoor unit further has a throttling device, and the indoor unit further has an indoor fan; the operating parameters of the air conditioner include: the frequency of the compressor, the suction temperature of the compressor, the wind speed of the indoor fan, the pipe temperature of the indoor heat exchanger, and the opening of the throttling device.

[0047] In step S120, after the cumulative running time of the compressor reaches the preset initial running time, the specific process of performing anti-frost protection on the indoor heat exchanger according to the changes in the operating parameters of the air conditioner is described in the following exemplary embodiment.

[0048] The following combination Figure 2 The flowchart of an embodiment of the method of the present invention for protecting the indoor heat exchanger from frost according to the changes in the operating parameters of the air conditioner is shown, further illustrating the specific process of protecting the indoor heat exchanger from frost according to the changes in the operating parameters of the air conditioner in step S120, including: steps S210 to S220.

[0049] Step S210, after the cumulative running time of the compressor reaches the preset initial running time, determine whether to start executing the preset anti-frost logic according to the frequency of the compressor and the wind speed of the indoor fan; wherein the preset initial running time is such as the compressor initial running time M 初始运行时间 .

[0050] In step S220, if it is determined to start executing the preset anti-frost logic, the preset anti-frost logic is executed based on the pipe temperature of the indoor heat exchanger and in combination with at least one of the opening of the throttling device and the suction temperature of the compressor to achieve anti-frost protection for the indoor unit.

[0051] Specifically, when the air conditioner is turned on and operates in cooling mode or dehumidification mode, the running time of the compressor is timed to obtain the cumulative running time of the compressor; and when the air conditioner operates in cooling mode or dehumidification mode, the frequency of the compressor and the suction temperature of the compressor are obtained, the wind speed of the indoor fan is obtained, the pipe temperature of the indoor heat exchanger is obtained, and the opening degree of the throttling device is obtained; wherein the suction temperature of the compressor is such as the suction temperature T 吸气 The pipe temperature of the indoor heat exchanger is such as the temperature of the indoor unit temperature sensor T 内管 The opening degree of the throttling device is such as the opening degree P of the electronic expansion valve. Furthermore, after the cumulative operating time of the compressor reaches a preset initial operating time, a determination is made based on the compressor frequency and the wind speed of the indoor fan to determine whether to initiate execution of the preset anti-frost logic. Of course, if the cumulative operating time of the compressor has not reached the preset initial operating time, the air conditioner is controlled to maintain current operation. Furthermore, if it is determined that the preset anti-frost logic is to be initiated, the preset anti-frost logic is executed based on the pipe temperature of the indoor heat exchanger and in combination with at least one of the opening degree of the throttling device and the suction temperature of the compressor, thereby implementing anti-frost protection for the indoor unit.

[0052] Compared with the anti-freezing control logic of household air conditioner evaporator in related solutions, the solution of the present invention adds the following control logic to avoid the phenomenon of frosting worsening caused by the evaporator frosting temperature sensor not being able to detect it: the following 6 parameters are mainly collected: the initial running time of the compressor M 初始运行时间 , indoor unit temperature sensor temperature T 内管 , compressor suction temperature T 吸气 , the superheat of the evaporator ΔT=T 吸气 -T 内管 , anti-freeze judgment time M 防冻结判断时间 , the opening degree of the electronic expansion valve at the anti-freezing judgment time ΔP, the inner tube temperature change ΔT of the indoor unit temperature sensor package at the anti-freezing judgment time 内管 .

[0053] After the inverter air conditioner is turned on and runs for a period of time M 初始运行时间 After reaching a stable state, that is, the compressor frequency remains unchanged, detect the relevant parameters and their changes. If the indoor unit fan gear remains unchanged, continuously detect M 防冻结判断时间 The opening change of the internal electronic expansion valve ΔP, and the difference between the real-time suction temperature of the compressor and the temperature of the indoor unit temperature sensor package, that is, the superheat of the evaporator ΔT and the temperature of the indoor unit temperature sensor package in M 防冻结判断时间 Internal temperature change ΔT 内管 , determine whether there is refrigerant deviation and overheating and frosting in the evaporator, and control whether the air conditioner enters anti-freeze protection operation.

[0054] The solution of the present invention collects various parameters during air conditioning operation and uses dynamic parameter changes to determine whether the air conditioner indoor unit is frosted, thus solving the problem of the air conditioner not being able to enter protection mode in a timely manner when frosting occurs in related solutions. The solution of the present invention more accurately determines the frosting status of the air conditioner indoor unit. Even if the air conditioner indoor unit encounters some special conditions that cause uneven liquid distribution, the air conditioner can enter protection mode in the event of frosting.

[0055] It has been verified that under certain special circumstances, such as low internal humidity or refrigerant leaks from long-term use, the internal evaporator can experience uneven liquid distribution, leading to significant temperature differences between the evaporator's flow paths, with some paths frosting while others remain. The novel logic judgment proposed in this invention allows for precise anti-freeze protection.

[0056] In some embodiments, in step S210, after the cumulative running time of the compressor reaches the preset initial running time, the specific process of determining whether to start executing the preset anti-frost logic is based on the frequency of the compressor and the wind speed of the indoor fan. See the following exemplary description.

[0057] The following combination Figure 3 The flowchart of an embodiment of the method of the present invention for determining whether to start executing the preset anti-frost logic based on the frequency of the compressor and the wind speed of the indoor fan is shown, further illustrating the specific process of determining whether to start executing the preset anti-frost logic based on the frequency of the compressor and the wind speed of the indoor fan in step S210, including: steps S310 to S330.

[0058] Step S310, after the cumulative running time of the compressor reaches the preset initial running time, determine the change in the frequency of the compressor within a first set time based on the frequency of the compressor; and determine the change in the wind speed of the indoor fan within the first set time based on the wind speed of the indoor fan.

[0059] Step S320 , determining whether the change in the frequency of the compressor is within a preset frequency change range and whether the change in the wind speed of the indoor fan is within a preset wind speed change range.

[0060] In step S330, if the conditions are satisfied, the preset anti-frost logic is started and the accumulated running time of the compressor is reset. If the conditions are not satisfied, the system waits until it is determined that the change in the frequency of the compressor is within the preset frequency change range and the change in the wind speed of the indoor fan is within the preset wind speed change range. The preset anti-frost logic is then started and the accumulated running time of the compressor is reset.

[0061] Figure 9 FIG. 1 is a flow chart of a novel control method for preventing frost on an indoor unit according to the present invention. Figure 9 As shown, the solution of the present invention proposes a new control method for preventing frost on an indoor unit, comprising:

[0062] Step 1: When the air conditioner is running in cooling or dehumidification mode, the running time of the air conditioner is counted. 初始运行时间 After that, if the compressor frequency or wind speed changes, the timer will be reset (i.e. the running time of the air conditioner will be reset), and real-time monitoring of T 内管 , then proceed to step 2. 初始运行时间 The preferred value is 10 to 30 minutes.

[0063] The solution of the present invention determines whether to start executing the preset anti-frost logic based on the frequency of the compressor and the wind speed of the indoor fan after the cumulative running time of the compressor reaches the preset initial running time, so that the preset anti-frost logic can be started at the right time, the frost condition of the air conditioner indoor unit can be judged more accurately, and anti-freeze protection can be performed accurately.

[0064] In some embodiments, in step S220, based on the pipe temperature of the indoor heat exchanger and in combination with at least one of the opening of the throttling device and the suction temperature of the compressor, a preset anti-frost logic is executed to implement anti-frost protection for the indoor unit, including: a process of implementing anti-frost protection for the indoor unit according to the pipe temperature of the indoor heat exchanger.

[0065] The following combination Figure 4 The flowchart of an embodiment of the method of the present invention for realizing anti-frost protection of the indoor unit according to the tube temperature of the indoor heat exchanger is shown, further illustrating the specific process of realizing anti-frost protection of the indoor unit according to the tube temperature of the indoor heat exchanger in step S220, including: step S410 to step S430.

[0066] Step S410: Determine whether the tube temperature of the indoor heat exchanger is less than or equal to 0.

[0067] In step S420, if it is determined that the pipe temperature of the indoor heat exchanger is less than or equal to 0, the preset anti-frost logic is executed: the compressor is controlled to stop to implement anti-frost protection for the indoor unit.

[0068] In step S430, if it is determined that the pipe temperature of the indoor heat exchanger is greater than 0, a preset anti-frost logic is executed in combination with at least one of the opening of the throttling device and the suction temperature of the compressor to implement anti-frost protection for the indoor unit.

[0069] like Figure 9 As shown, the solution of the present invention proposes a novel control method for preventing frost on an indoor unit, further comprising:

[0070] Step 2: Determine T 内管 Is it less than or equal to 0? If so, go to step 3; otherwise, go to step 4.

[0071] Step 3: If T 内管 If the temperature is less than 1℃, the system will enter the anti-freeze protection mode. If the indoor unit of the air conditioner is frosted, the system will stop the air conditioner and the frost on the indoor unit will be melted in time.

[0072] The solution of the present invention executes a preset anti-frost logic based on the tube temperature of the indoor heat exchanger and combined with at least one of the opening of the throttling device and the suction temperature of the compressor, thereby realizing anti-frost protection for the indoor unit, more accurately determining the frost condition of the air-conditioning indoor unit, and accurately performing anti-freeze protection.

[0073] In some embodiments, in step S430, the preset anti-frost logic is executed in combination with the opening of the throttling device and at least one of the suction temperature of the compressor to achieve anti-frost protection for the indoor unit, including: a process of achieving anti-frost protection for the indoor unit in combination with the opening of the throttling device.

[0074] The following combination Figure 5 The flowchart of an embodiment of the method of the present invention for realizing anti-frost protection for the indoor unit in combination with the opening of the throttling device is shown, further illustrating the specific process of realizing anti-frost protection for the indoor unit in combination with the opening of the throttling device in step S430, including: steps S510 to S540.

[0075] Step S510, determining the change in the opening of the throttling device within a second set time according to the opening of the throttling device; wherein the second set time is greater than the first set time, and the second set time is such as the anti-freeze judgment time M 防冻结判断时间The change in the opening degree of the throttling device is such as the opening degree ΔP of the electronic expansion valve during the anti-freezing judgment time.

[0076] Step S520: Determine whether the change in the opening degree of the throttling device is greater than 0.

[0077] Step S530: If it is determined that the change in the opening of the throttling device is greater than 0, it is determined not to execute the preset anti-frost logic, and the air conditioner is controlled to maintain the current operation.

[0078] Step S540: If it is determined that the change in the opening degree of the throttling device is less than or equal to 0, the preset anti-frost logic is executed in combination with the suction temperature of the compressor to implement anti-frost protection for the indoor unit.

[0079] like Figure 9 As shown, the solution of the present invention proposes a novel control method for preventing frost on an indoor unit, further comprising:

[0080] Step 4: If T 内管 >1℃, continuous detection M 防冻结判断时间 The opening degree of the internal electronic expansion valve changes ΔP, and the compressor suction temperature T is detected in real time 吸气 And the indoor unit temperature sensor temperature T 内管 The difference is the evaporator superheat ΔT, and then step 5 is executed. The electronic expansion valve is set in the outdoor unit. 防冻结判断时间 The preferred value is 5 to 20 minutes. The electronic expansion valve is a throttling device in the air conditioner's outdoor unit. The refrigerant is first compressed by the compressor, then condensed by the condenser. It is then throttled by the electronic expansion valve, which reduces the pressure. It then flows through the evaporator and returns to the compressor, completing the refrigerant cycle. Both capillary tubes and electronic expansion valves have a throttling effect. The advantage of electronic expansion valves over capillary tubes is that they can adjust the opening to control the refrigerant flow.

[0081] Step 5: Determine whether ΔP is greater than 0: If so, proceed to step 6; otherwise, proceed to step 7.

[0082] Step 6: If ΔP > 0, the electronic expansion valve remains fully open during operation. Based on system operation, there is no risk of frost forming on the indoor unit due to uneven evaporator liquid distribution, so the unit can continue to operate. The electronic expansion valve is fully open, and this parameter indicates that the indoor unit is not frosted. The unit can continue cooling normally without entering anti-freeze protection.

[0083] The solution of the present invention realizes anti-frost protection for the indoor unit in combination with the opening degree of the throttling device, more accurately determines the frost condition of the air-conditioning indoor unit, and accurately performs anti-freezing protection.

[0084] In some embodiments, in step S540, the preset anti-frost logic is executed in combination with the suction temperature of the compressor to implement anti-frost protection for the indoor unit, including: a process of implementing anti-frost protection for the indoor unit in combination with the suction temperature of the compressor.

[0085] The following combination Figure 6 The flowchart of an embodiment of the method of the present invention for realizing anti-frost protection for the indoor unit in combination with the suction temperature of the compressor is shown, further illustrating the specific process of realizing anti-frost protection for the indoor unit in combination with the suction temperature of the compressor in step S540, including: steps S610 to S640.

[0086] Step S610: Determine the difference between the suction temperature of the compressor and the tube temperature of the indoor heat exchanger, and record it as the superheat of the indoor heat exchanger; wherein the superheat of the indoor heat exchanger is the superheat of the evaporator ΔT = T 吸气 -T 内管 .

[0087] Step S620, determining whether the superheat of the indoor heat exchanger is greater than or equal to a preset normal superheat; wherein the preset normal superheat is T 正常过热度 .

[0088] Step S630: If it is determined that the superheat of the indoor heat exchanger is greater than or equal to the preset normal superheat, it is determined not to execute the preset anti-frost logic, and the air conditioner is controlled to maintain the current operation.

[0089] In step S640, if it is determined that the superheat of the indoor heat exchanger is less than the preset normal superheat, the preset anti-frost logic is executed again according to the pipe temperature of the indoor heat exchanger to implement anti-frost protection for the indoor unit.

[0090] like Figure 9 As shown, the solution of the present invention proposes a novel control method for preventing frost on an indoor unit, further comprising:

[0091] Step 7: If ΔP≤0, that is, the electronic expansion valve is in a state of being always opened slightly during operation, there are two cases at this time, see steps 71 and 72 for details.

[0092] Step 71: The electronic expansion valve is opened small because the system needs cooling capacity. At this time, the system throttling is too small and the throttling needs to be increased to increase the cooling capacity. In this state, the electronic expansion valve opens small and the system superheat will increase. That is, when ΔT≥T 正常过热度 , it is determined that there is no frost on the indoor unit and the anti-freeze protection is not activated. At this time, the superheat degree is greater than the normal superheat degree. Through this parameter, it can be determined that there is no frost on the indoor unit of the air conditioner and the anti-freeze protection does not need to be activated. The machine can continue to cool normally.

[0093] The solution of the present invention realizes anti-frost protection for the indoor unit in combination with the suction temperature of the compressor, more accurately determines the frosting condition of the air-conditioning indoor unit, and accurately performs anti-freezing protection.

[0094] In some embodiments, in step S640, the preset anti-frost logic is executed again according to the tube temperature of the indoor heat exchanger to implement anti-frost protection for the indoor unit, including: a process of implementing anti-frost protection for the indoor unit according to the change in the tube temperature of the indoor heat exchanger.

[0095] The following combination Figure 7 The flowchart of an embodiment of the method of the present invention for realizing anti-frost protection of the indoor unit according to the change in the tube temperature of the indoor heat exchanger is shown, further illustrating the specific process of realizing anti-frost protection of the indoor unit according to the change in the tube temperature of the indoor heat exchanger in step S640, including: steps S710 to S740.

[0096] Step S710: determining the change in the temperature of the indoor heat exchanger tube within a third set time according to the tube temperature of the indoor heat exchanger; wherein the change in the temperature of the indoor heat exchanger tube is ΔT 内管 .

[0097] Step S720: Determine whether the change in the tube temperature of the indoor heat exchanger is greater than or equal to a preset tube temperature change; wherein the preset tube temperature change is, for example, 3°C.

[0098] Step S730: If it is determined that the change in the tube temperature of the indoor heat exchanger is greater than or equal to the preset tube temperature change, the preset anti-frost logic is executed: the compressor is controlled to stop to implement anti-frost protection for the indoor unit.

[0099] Step S740: If it is determined that the change in the tube temperature of the indoor heat exchanger is less than the preset tube temperature change, it is determined not to execute the preset anti-frost logic, and the air conditioner is controlled to maintain the current operation.

[0100] like Figure 9 As shown, the solution of the present invention proposes a novel control method for preventing frost on an indoor unit, further comprising:

[0101] Step 72: Another situation is that the evaporator of the internal machine has uneven flow distribution, which leads to frost. Check ΔT<T 正常过热度 :For details, see step 721 and step 722. 正常过热度 The preferred value is 1°C to 3°C, preferably 2°C.

[0102] Step 721: If ΔT 内管≥3℃, then the judgment basis is that there is serious uneven liquid distribution, and it is determined that the indoor unit is seriously frosted and needs to enter anti-freeze protection. At this time, the air conditioner indoor unit is frosted, and entering anti-freeze protection can shut down the air conditioner so that the frost on the indoor unit can be melted in time.

[0103] Step 722: If ΔT 内管 If the temperature is less than 3℃, it is determined that the frost on the indoor unit is not serious and the unit can be cooled normally, and the unit does not enter the anti-freeze protection mode. 内管 If the temperature is less than 3℃, this parameter can be used to determine that there is no frost on the indoor unit of the air conditioner. The machine can cool normally without entering the anti-freeze protection mode.

[0104] After the inverter air conditioner is turned on and runs for a period of time M 初始运行时间 After reaching a stable state, the compressor frequency remains unchanged, and the real-time change of the evaporator tube temperature sensor is detected. If the indoor unit fan gear remains unchanged, the M 防冻结判断时间 Internal electronic expansion valve opening change ΔP; real-time monitoring of suction temperature T 吸气 And the indoor unit temperature sensor temperature T 内管 The temperature difference ΔT and the temperature change of the indoor unit temperature sensor are used to determine whether there is refrigerant bias and overheating and frosting in the evaporator, and to control whether the air conditioner enters anti-freeze protection operation. For specific judgment logic, please refer to Figure 9 Example shown.

[0105] After the air conditioner reaches a stable state, while the compressor frequency and indoor fan speed remain unchanged, the solution of this invention detects and determines the changing trend and speed of the indoor evaporator tube temperature, combined with the evaporator superheat, to determine the evaporator refrigerant flow deviation and overheating, thereby preventing the air conditioner's cooling effect from deteriorating and the evaporator from frosting. This solution accurately determines the frosting condition of the indoor unit, solving the problem of residential air conditioners experiencing frosting but no protection.

[0106] By adopting the technical solution of this embodiment, the running time of the compressor is timed when the air conditioner is turned on and running in cooling mode or dehumidification mode, and the air conditioner operating parameters such as the frequency of the compressor, the suction temperature of the compressor, the gear of the indoor fan, the temperature of the indoor unit temperature sensor, the change in the opening of the electronic expansion valve within the anti-freezing judgment time, and the change in the internal pipe temperature within the anti-freezing judgment time are detected. The frost condition of the indoor unit is accurately determined according to the changes in the air conditioner operating parameters, so that anti-frost protection is performed when it is determined that the indoor unit is frosted; thus, by accurately determining the frost condition of the indoor unit according to the changes in the air conditioner operating parameters, the indoor unit can be reliably protected from frost.

[0107] According to an embodiment of the present invention, a control device for an air conditioner corresponding to the control method for an air conditioner is also provided. Figure 8The structure diagram of an embodiment of the device of the present invention is shown. The air conditioner comprises an outdoor unit and an indoor unit, wherein the outdoor unit comprises a compressor, and the indoor unit comprises an indoor heat exchanger. Of course, the outdoor unit also comprises an outdoor heat exchanger. A temperature sensing package is provided on the indoor heat exchanger for obtaining the pipe temperature T of the indoor heat exchanger. 内管 In the solution of the present invention, Figure 8 As shown, the air conditioner control device includes: an acquisition unit 102 and a control unit 104.

[0108] The acquisition unit 102 is configured to, when the air conditioner is powered on and operating in cooling mode or dehumidification mode, measure the operating time of the compressor to obtain the cumulative operating time of the compressor; and, when the air conditioner is operating in cooling mode or dehumidification mode, obtain operating parameters of the air conditioner. The specific functions and processing of the acquisition unit 102 are described in step S110.

[0109] The control unit 104 is configured to, after the cumulative operating time of the compressor reaches a preset initial operating time, perform anti-frost protection on the indoor heat exchanger based on changes in the operating parameters of the air conditioner. The specific functions and processing of the control unit 104 are described in step S120.

[0110] The solution of the present invention proposes a new control scheme for preventing frost on the indoor unit. By collecting the operating parameters of the air conditioner and the changes in related parameters in the operating parameters, the frost condition of the indoor unit is accurately determined, thereby solving the pain point problem of frosting of the indoor unit of the household air conditioner but no protection.

[0111] In some embodiments, the outdoor unit further has a throttling device, and the indoor unit further has an indoor fan; the operating parameters of the air conditioner include: the frequency of the compressor, the suction temperature of the compressor, the wind speed of the indoor fan, the pipe temperature of the indoor heat exchanger, and the opening of the throttling device.

[0112] The control unit 104 performs anti-frost protection on the indoor heat exchanger according to changes in the operating parameters of the air conditioner after the cumulative operating time of the compressor reaches a preset initial operating time, including:

[0113] The control unit 104 is further configured to determine whether to start executing the preset anti-frost logic according to the frequency of the compressor and the wind speed of the indoor fan after the cumulative running time of the compressor reaches the preset initial running time; wherein the preset initial running time is such as the compressor initial running time M 初始运行时间 The specific functions and processing of the control unit 104 are also described in step S210.

[0114] The control unit 104 is further configured to, if it is determined to initiate execution of the preset anti-frost logic, execute the preset anti-frost logic based on the pipe temperature of the indoor heat exchanger and in combination with at least one of the opening of the throttling device and the suction temperature of the compressor, thereby implementing anti-frost protection for the indoor unit. The specific functions and processing of the control unit 104 are further described in step S220.

[0115] Specifically, the acquisition unit 102 is further configured to time the running time of the compressor when the air conditioner is turned on and operates in cooling mode or dehumidification mode, and obtain the cumulative running time of the compressor; and, when the air conditioner operates in cooling mode or dehumidification mode, obtain the frequency of the compressor and the suction temperature of the compressor, obtain the wind speed of the indoor fan, obtain the pipe temperature of the indoor heat exchanger, and obtain the opening degree of the throttling device; wherein the suction temperature of the compressor is such as the suction temperature T 吸气 The pipe temperature of the indoor heat exchanger is such as the temperature of the indoor unit temperature sensor T 内管 , the opening degree of the throttling device is such as the opening degree P of the electronic expansion valve. Furthermore, the control unit 104 is further configured to determine whether to start executing the preset anti-frost logic based on the frequency of the compressor and the wind speed of the indoor fan after the cumulative running time of the compressor reaches the preset initial running time; of course, the control unit 104 is further configured to control the air conditioner to maintain the current operation if the cumulative running time of the compressor has not reached the preset initial running time. Furthermore, the control unit 104 is further configured to execute the preset anti-frost logic based on the pipe temperature of the indoor heat exchanger and in combination with at least one of the opening degree of the throttling device and the suction temperature of the compressor, if it is determined to start executing the preset anti-frost logic, to achieve anti-frost protection for the indoor unit.

[0116] Compared with the anti-freezing control logic of household air conditioner evaporator in related solutions, the solution of the present invention adds the following control logic to avoid the phenomenon of frosting worsening caused by the evaporator frosting temperature sensor not being able to detect it: the following 6 parameters are mainly collected: the initial running time of the compressor M 初始运行时间 , indoor unit temperature sensor temperature T 内管 , compressor suction temperature T 吸气 , the superheat of the evaporator ΔT=T 吸气 -T 内管 , anti-freeze judgment time M 防冻结判断时间 , the opening degree of the electronic expansion valve at the anti-freezing judgment time ΔP, the inner tube temperature change ΔT of the indoor unit temperature sensor package at the anti-freezing judgment time 内管 .

[0117] After the inverter air conditioner is turned on and runs for a period of time M 初始运行时间After reaching a stable state, that is, the compressor frequency remains unchanged, detect the relevant parameters and their changes. If the indoor unit fan gear remains unchanged, continuously detect M 防冻结判断时间 The opening change of the internal electronic expansion valve ΔP, and the difference between the real-time suction temperature of the compressor and the temperature of the indoor unit temperature sensor package, that is, the superheat of the evaporator ΔT and the temperature of the indoor unit temperature sensor package in M 防冻结判断时间 Internal temperature change ΔT 内管 , determine whether there is refrigerant deviation and overheating and frosting in the evaporator, and control whether the air conditioner enters anti-freeze protection operation.

[0118] The solution of the present invention collects various parameters during air conditioning operation and uses dynamic parameter changes to determine whether the air conditioner indoor unit is frosted, thus solving the problem of the air conditioner not being able to enter protection mode in a timely manner when frosting occurs in related solutions. The solution of the present invention more accurately determines the frosting status of the air conditioner indoor unit. Even if the air conditioner indoor unit encounters some special conditions that cause uneven liquid distribution, the air conditioner can enter protection mode in the event of frosting.

[0119] It has been verified that under certain special circumstances, such as low internal humidity or refrigerant leaks from long-term use, the internal evaporator can experience uneven liquid distribution, leading to significant temperature differences between the evaporator's flow paths, with some paths frosting while others remain. The novel logic judgment proposed in this invention allows for precise anti-freeze protection.

[0120] In some embodiments, after the cumulative running time of the compressor reaches a preset initial running time, the control unit 104 determines whether to start executing a preset anti-frost logic based on the frequency of the compressor and the wind speed of the indoor fan, including:

[0121] The control unit 104 is further configured to, after the cumulative operating time of the compressor reaches a preset initial operating time, determine a change in the compressor frequency within a first set time based on the compressor frequency; and determine a change in the indoor fan speed within the first set time based on the indoor fan speed. The specific functions and processing of the control unit 104 are further described in step S310.

[0122] The control unit 104 is further configured to determine whether the change in the frequency of the compressor is within a preset frequency change range and the change in the wind speed of the indoor fan is within a preset wind speed change range. The specific functions and processing of the control unit 104 are further described in step S320.

[0123] The control unit 104 is further configured to, if the conditions are determined to be satisfied, initiate execution of the preset anti-frost logic and reset the accumulated run time of the compressor. Alternatively, if the conditions are determined not to be satisfied, the control unit 104 may wait until the change in the compressor frequency is within a preset frequency variation range and the change in the indoor fan speed is within a preset speed variation range, and then initiate execution of the preset anti-frost logic and reset the accumulated run time of the compressor. The specific functions and processing of the control unit 104 are further described in step S330.

[0124] Figure 9 FIG. 1 is a flow chart of a novel control method for preventing frost on an indoor unit according to the present invention. Figure 9 As shown, the solution of the present invention proposes a new control method for preventing frost on an indoor unit, comprising:

[0125] Step 1: When the air conditioner is running in cooling or dehumidification mode, the running time of the air conditioner is counted. 初始运行时间 After that, if the compressor frequency or wind speed changes, the timer will be reset (i.e. the running time of the air conditioner will be reset), and real-time monitoring of T 内管 , then proceed to step 2. 初始运行时间 The preferred value is 10 to 30 minutes.

[0126] The solution of the present invention determines whether to start executing the preset anti-frost logic based on the frequency of the compressor and the wind speed of the indoor fan after the cumulative running time of the compressor reaches the preset initial running time, so that the preset anti-frost logic can be started at the right time, the frost condition of the air conditioner indoor unit can be judged more accurately, and anti-freeze protection can be performed accurately.

[0127] In some embodiments, the control unit 104 executes a preset anti-frost logic based on the pipe temperature of the indoor heat exchanger and in combination with at least one of the opening of the throttling device and the suction temperature of the compressor to implement anti-frost protection for the indoor unit, including: implementing anti-frost protection for the indoor unit according to the pipe temperature of the indoor heat exchanger, specifically as follows:

[0128] The control unit 104 is further configured to determine whether the tube temperature of the indoor heat exchanger is less than or equal to 0. The specific functions and processing of the control unit 104 are also described in step S410.

[0129] The control unit 104 is further configured to execute a preset anti-frost logic if it determines that the pipe temperature of the indoor heat exchanger is less than or equal to 0: controlling the compressor to stop, thereby implementing anti-frost protection for the indoor unit. The specific functions and processing of the control unit 104 are further described in step S420.

[0130] The control unit 104 is further configured to, if it determines that the pipe temperature of the indoor heat exchanger is greater than 0, execute a preset anti-frost logic based on at least one of the opening of the throttling device and the suction temperature of the compressor to provide anti-frost protection for the indoor unit. The specific functions and processing of the control unit 104 are further described in step S430.

[0131] like Figure 9 As shown, the solution of the present invention proposes a novel control method for preventing frost on an indoor unit, further comprising:

[0132] Step 2: Determine T 内管 Is it less than or equal to 0? If so, go to step 3; otherwise, go to step 4.

[0133] Step 3: If T 内管 If the temperature is less than 1℃, the system will enter the anti-freeze protection mode. If the indoor unit of the air conditioner is frosted, the system will stop the air conditioner and the frost on the indoor unit will be melted in time.

[0134] The solution of the present invention executes a preset anti-frost logic based on the tube temperature of the indoor heat exchanger and combined with at least one of the opening of the throttling device and the suction temperature of the compressor, thereby realizing anti-frost protection for the indoor unit, more accurately determining the frost condition of the air-conditioning indoor unit, and accurately performing anti-freeze protection.

[0135] In some embodiments, the control unit 104 executes a preset anti-frost logic based on at least one of the opening of the throttling device and the suction temperature of the compressor to implement anti-frost protection for the indoor unit, including: implementing the anti-frost protection for the indoor unit based on the opening of the throttling device, specifically as follows:

[0136] The control unit 104 is further configured to determine the change in the opening of the throttling device within a second set time according to the opening of the throttling device; wherein the second set time is greater than the first set time, and the second set time is such as the anti-freeze judgment time M 防冻结判断时间 The change in the opening degree of the throttling device is, for example, the opening degree ΔP of the electronic expansion valve during the anti-freezing judgment time. The specific functions and processing of the control unit 104 are also described in step S510.

[0137] The control unit 104 is further configured to determine whether the change in the opening of the throttling device is greater than 0. The specific functions and processing of the control unit 104 are also described in step S520.

[0138] The control unit 104 is further configured to, if it is determined that the change in the opening of the throttling device is greater than 0, determine not to execute the preset anti-frost logic and control the air conditioner to maintain the current operation. The specific functions and processing of the control unit 104 are also shown in step S530.

[0139] The control unit 104 is further configured to, if it determines that the change in the opening degree of the throttling device is less than or equal to 0, execute a preset anti-frost logic based on the suction temperature of the compressor to implement anti-frost protection for the indoor unit. The specific functions and processing of the control unit 104 are further described in step S540.

[0140] like Figure 9 As shown, the solution of the present invention proposes a novel control method for preventing frost on an indoor unit, further comprising:

[0141] Step 4: If T 内管 >1℃, continuous detection M 防冻结判断时间 The opening degree of the internal electronic expansion valve changes ΔP, and the compressor suction temperature T is detected in real time 吸气 And the indoor unit temperature sensor temperature T 内管 The difference is the evaporator superheat ΔT, and then step 5 is executed. The electronic expansion valve is set in the outdoor unit. 防冻结判断时间 The preferred value is 5 to 20 minutes.

[0142] Step 5: Determine whether ΔP is greater than 0: If so, proceed to step 6; otherwise, proceed to step 7.

[0143] Step 6: If ΔP > 0, the electronic expansion valve remains fully open during operation. Based on system operation, there is no risk of frost forming on the indoor unit due to uneven evaporator liquid distribution, so the unit can continue to operate. The electronic expansion valve is fully open, and this parameter indicates that the indoor unit is not frosted. The unit can continue cooling normally without entering anti-freeze protection.

[0144] The solution of the present invention realizes anti-frost protection for the indoor unit in combination with the opening degree of the throttling device, more accurately determines the frost condition of the air-conditioning indoor unit, and accurately performs anti-freezing protection.

[0145] In some embodiments, the control unit 104 executes a preset anti-frost logic in combination with the suction temperature of the compressor to implement anti-frost protection for the indoor unit, including: implementing the anti-frost protection for the indoor unit in combination with the suction temperature of the compressor, specifically as follows:

[0146] The control unit 104 is further configured to determine the difference between the suction temperature of the compressor and the tube temperature of the indoor heat exchanger, which is recorded as the superheat of the indoor heat exchanger; wherein the superheat of the indoor heat exchanger is the superheat of the evaporator ΔT=T 吸气 -T 内管 The specific functions and processing of the control unit 104 are also described in step S610.

[0147] The control unit 104 is further configured to determine whether the superheat of the indoor heat exchanger is greater than or equal to a preset normal superheat; wherein the preset normal superheat is T 正常过热度 The specific functions and processing of the control unit 104 are also described in step S620.

[0148] The control unit 104 is further configured to, if it is determined that the superheat of the indoor heat exchanger is greater than or equal to a preset normal superheat, determine not to execute the preset anti-frost logic and control the air conditioner to maintain current operation. The specific functions and processing of the control unit 104 are further described in step S630.

[0149] The control unit 104 is further configured to, if it determines that the superheat of the indoor heat exchanger is less than a preset normal superheat, execute a preset anti-frost logic based on the pipe temperature of the indoor heat exchanger to implement anti-frost protection for the indoor unit. The specific functions and processing of the control unit 104 are further described in step S640.

[0150] like Figure 9 As shown, the solution of the present invention proposes a novel control method for preventing frost on an indoor unit, further comprising:

[0151] Step 7: If ΔP≤0, that is, the electronic expansion valve is in a state of being always opened slightly during operation, there are two cases at this time, see steps 71 and 72 for details.

[0152] Step 71: The electronic expansion valve is opened small because the system needs cooling capacity. At this time, the system throttling is too small and the throttling needs to be increased to increase the cooling capacity. In this state, the electronic expansion valve opens small and the system superheat will increase. That is, when ΔT≥T 正常过热度 , it is determined that there is no frost on the indoor unit and the anti-freeze protection is not activated. At this time, the superheat degree is greater than the normal superheat degree. Through this parameter, it can be determined that there is no frost on the indoor unit of the air conditioner and the anti-freeze protection does not need to be activated. The machine can continue to cool normally.

[0153] The solution of the present invention realizes anti-frost protection for the indoor unit in combination with the suction temperature of the compressor, more accurately determines the frosting condition of the air-conditioning indoor unit, and accurately performs anti-freezing protection.

[0154] In some embodiments, the control unit 104 executes a preset anti-frost logic again based on the pipe temperature of the indoor heat exchanger to implement anti-frost protection for the indoor unit, including: implementing anti-frost protection for the indoor unit based on the change in the pipe temperature of the indoor heat exchanger, specifically as follows:

[0155] The control unit 104 is further configured to determine the change in the tube temperature of the indoor heat exchanger within a third set time according to the tube temperature of the indoor heat exchanger; wherein the change in the tube temperature of the indoor heat exchanger is as follows ΔT 内管 The specific functions and processing of the control unit 104 are also described in step S710.

[0156] The control unit 104 is further configured to determine whether the change in the tube temperature of the indoor heat exchanger is greater than or equal to a preset tube temperature change; wherein the preset tube temperature change is, for example, 3°C. The specific functions and processing of the control unit 104 are further described in step S720.

[0157] The control unit 104 is further configured to, if it determines that the change in the indoor heat exchanger tube temperature is greater than or equal to a preset tube temperature change, execute a preset anti-frost logic to control the compressor to shut down, thereby implementing anti-frost protection for the indoor unit. The specific functions and processing of the control unit 104 are further described in step S730.

[0158] The control unit 104 is further configured to, if it is determined that the change in the indoor heat exchanger tube temperature is less than a preset tube temperature change, determine not to execute the preset anti-frost logic and control the air conditioner to maintain current operation. The specific functions and processing of the control unit 104 are further described in step S740.

[0159] like Figure 9 As shown, the solution of the present invention proposes a novel control method for preventing frost on an indoor unit, further comprising:

[0160] Step 72: Another situation is that the evaporator of the internal machine has uneven flow distribution, which leads to frost. Check ΔT<T 正常过热度 :For details, see step 721 and step 722. 正常过热度 The preferred value is 1℃~3℃.

[0161] Step 721: If ΔT 内管 ≥3℃, then the judgment basis is that there is serious uneven liquid distribution, and it is determined that the indoor unit is seriously frosted and needs to enter anti-freeze protection. At this time, the air conditioner indoor unit is frosted, and entering anti-freeze protection can shut down the air conditioner so that the frost on the indoor unit can be melted in time.

[0162] Step 722: If ΔT 内管If the temperature is less than 3℃, it is determined that the frost on the indoor unit is not serious and the unit can be cooled normally, and the unit does not enter the anti-freeze protection mode. 内管 If the temperature is less than 3℃, this parameter can be used to determine that there is no frost on the indoor unit of the air conditioner. The machine can cool normally without entering the anti-freeze protection mode.

[0163] After the inverter air conditioner is turned on and runs for a period of time M 初始运行时间 After reaching a stable state, the compressor frequency remains unchanged, and the real-time change of the evaporator tube temperature sensor is detected. If the indoor unit fan gear remains unchanged, the M 防冻结判断时间 Internal electronic expansion valve opening change ΔP; real-time monitoring of suction temperature T 吸气 And the indoor unit temperature sensor temperature T 内管 The temperature difference ΔT and the temperature change of the indoor unit temperature sensor are used to determine whether there is refrigerant bias and overheating and frosting in the evaporator, and to control whether the air conditioner enters anti-freeze protection operation. For specific judgment logic, please refer to Figure 9 Example shown.

[0164] After the air conditioner reaches a stable state, while the compressor frequency and indoor fan speed remain unchanged, the solution of this invention detects and determines the changing trend and speed of the indoor evaporator tube temperature, combined with the evaporator superheat, to determine the evaporator refrigerant flow deviation and overheating, thereby preventing the air conditioner's cooling effect from deteriorating and the evaporator from frosting. This solution accurately determines the frosting condition of the indoor unit, solving the problem of residential air conditioners experiencing frosting but no protection.

[0165] Since the processing and functions implemented by the device of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0166] According to an embodiment of the present invention, an air conditioner corresponding to the air conditioner control device is also provided. The air conditioner may include: the air conditioner control device described above.

[0167] Since the processing and functions implemented by the air conditioner of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned devices, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0168] According to an embodiment of the present invention, a computer program product corresponding to the air conditioner control method is also provided, including a computer program. When the computer program is executed by a processor, the steps of the air conditioner control method described above are implemented.

[0169] Since the processing and functions implemented by the product of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0170] According to an embodiment of the present invention, a storage medium corresponding to the air conditioner control method is also provided, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the steps of the air conditioner control method described above.

[0171] Since the processing and functions implemented by the storage medium of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0172] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0173] The foregoing description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of the claims.

Claims

1. A method for controlling an air conditioner, characterized in that: The air conditioner comprises an outdoor unit and an indoor unit, the outdoor unit comprises a compressor, and the indoor unit comprises an indoor heat exchanger; The air conditioner control method includes: When the air conditioner is turned on and operates in cooling mode or dehumidification mode, timing the operating time of the compressor to obtain the cumulative operating time of the compressor; and obtaining operating parameters of the air conditioner; After the cumulative running time of the compressor reaches a preset initial running time, the indoor heat exchanger is protected from frost according to changes in the operating parameters of the air conditioner.

2. The air conditioner control method according to claim 1, characterized in that: The outdoor unit further comprises a throttling device, and the indoor unit further comprises an indoor fan; the operating parameters of the air conditioner include: the frequency of the compressor, the suction temperature of the compressor, the wind speed of the indoor fan, the pipe temperature of the indoor heat exchanger, and the opening degree of the throttling device; After the cumulative running time of the compressor reaches a preset initial running time, the indoor heat exchanger is protected from frost according to changes in the operating parameters of the air conditioner, including: After the cumulative running time of the compressor reaches the preset initial running time, determining whether to start executing the preset anti-frost logic according to the frequency of the compressor and the wind speed of the indoor fan; If it is determined to start executing the preset anti-frost logic, the preset anti-frost logic is executed based on the tube temperature of the indoor heat exchanger and combined with at least one of the opening of the throttling device and the suction temperature of the compressor to achieve anti-frost protection for the indoor unit.

3. The air conditioner control method according to claim 2, characterized in that: After the cumulative running time of the compressor reaches a preset initial running time, determining whether to start executing a preset anti-frost logic according to the frequency of the compressor and the wind speed of the indoor fan includes: After the cumulative running time of the compressor reaches a preset initial running time, determining the change amount of the frequency of the compressor within a first set time based on the frequency of the compressor; and determining the change amount of the wind speed of the indoor fan within the first set time based on the wind speed of the indoor fan; Determining whether a change in the frequency of the compressor is within a preset frequency change range and a change in the wind speed of the indoor fan is within a preset wind speed change range; If it is determined that the conditions are met, it is determined to start executing the preset anti-frost logic and reset the accumulated running time of the compressor.

4. The air conditioner control method according to claim 2 or 3, characterized in that: Based on the tube temperature of the indoor heat exchanger and in combination with at least one of the opening degree of the throttling device and the suction temperature of the compressor, a preset anti-frost logic is executed to implement anti-frost protection for the indoor unit, including: Determining whether the tube temperature of the indoor heat exchanger is less than or equal to 0; If it is determined that the pipe temperature of the indoor heat exchanger is less than or equal to 0, the preset anti-frost logic is executed: the compressor is controlled to stop to implement anti-frost protection for the indoor unit; If it is determined that the pipe temperature of the indoor heat exchanger is greater than 0, the preset anti-frost logic is executed in combination with at least one of the opening of the throttling device and the suction temperature of the compressor to achieve anti-frost protection for the indoor unit.

5. The air conditioner control method according to claim 4, characterized in that: In combination with at least one of the opening degree of the throttling device and the suction temperature of the compressor, a preset anti-frost logic is executed to implement anti-frost protection for the indoor unit, including: Determining a change in the opening of the throttling device within a second set time according to the opening of the throttling device; wherein the second set time is greater than the first set time; Determining whether a change in the opening of the throttling device is greater than 0; If it is determined that the change in the opening of the throttling device is greater than 0, it is determined not to execute the preset anti-frost logic, and the air conditioner is controlled to maintain the current operation; If it is determined that the change in the opening degree of the throttling device is less than or equal to 0, the preset anti-frost logic is executed in combination with the suction temperature of the compressor to achieve anti-frost protection for the indoor unit.

6. The air conditioner control method according to claim 5, characterized in that: In combination with the suction temperature of the compressor, a preset anti-frost logic is executed to implement anti-frost protection for the indoor unit, including: Determine the difference between the suction temperature of the compressor and the tube temperature of the indoor heat exchanger, and record it as the superheat of the indoor heat exchanger; determining whether the superheat of the indoor heat exchanger is greater than or equal to a preset normal superheat; If it is determined that the superheat of the indoor heat exchanger is greater than or equal to the preset normal superheat, determining not to execute the preset anti-frost logic and controlling the air conditioner to maintain the current operation; If it is determined that the superheat of the indoor heat exchanger is less than the preset normal superheat, the preset anti-frost logic is executed again according to the tube temperature of the indoor heat exchanger to implement anti-frost protection for the indoor unit.

7. The air conditioner control method according to claim 6, characterized in that: Again, according to the tube temperature of the indoor heat exchanger, the preset anti-frost logic is executed to implement anti-frost protection for the indoor unit, including: determining, based on the tube temperature of the indoor heat exchanger, a change in the tube temperature of the indoor heat exchanger within a third set time; Determining whether a change in the tube temperature of the indoor heat exchanger is greater than or equal to a preset tube temperature change; If it is determined that the change in the tube temperature of the indoor heat exchanger is greater than or equal to a preset tube temperature change, a preset anti-frost logic is executed: the compressor is controlled to stop to implement anti-frost protection for the indoor unit; If it is determined that the change in the tube temperature of the indoor heat exchanger is less than a preset tube temperature change, it is determined not to execute the preset anti-frost logic, and the air conditioner is controlled to maintain the current operation.

8. A control device for an air conditioner, characterized in that: The air conditioner comprises an outdoor unit and an indoor unit, wherein the outdoor unit comprises a compressor and the indoor unit comprises an indoor heat exchanger; and the control device of the air conditioner comprises: an acquiring unit configured to, when the air conditioner is turned on and operates in a cooling mode or a dehumidification mode, time the operating time of the compressor to obtain the accumulated operating time of the compressor; and acquire operating parameters of the air conditioner; The control unit is configured to perform anti-frost protection on the indoor heat exchanger according to changes in operating parameters of the air conditioner after the cumulative operating time of the compressor reaches a preset initial operating time.

9. An air conditioner, characterized in that: include: The air conditioner control device according to claim 8.

10. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the air conditioner control method according to any one of claims 1 to 7.

11. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the air conditioner control method according to any one of claims 1 to 7 are implemented.

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