Air conditioner indoor heat exchanger self-cleaning control method, device and system and air conditioner

Abstract

The invention discloses an air conditioner indoor heat exchanger self-cleaning control method, device and system and an air conditioner, and belongs to the field of air conditioner self-cleaning. According to the scheme, after the air conditioner enters the self-cleaning mode of the indoor heat exchanger, the air conditioner is controlled according to the difference value between the indoor temperature and the indoor set temperature before frosting, and the air conditioner is controlled according to the difference value during defrosting, so that the indoor temperature is not affected as much as possible during frosting and defrosting, and the user experience is improved.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioner self-cleaning, and in particular, to a method, device, system and air conditioner for controlling a self-cleaning of an indoor heat exchanger of an air conditioner. Background Art

[0002] Air conditioners have become frequently used in households, and indoor heat exchangers will generate a lot of dust. A lot of dirt will adhere to the heat exchanger, causing dust on the surface of the heat exchanger, thereby increasing wind resistance, hindering air flow, and deteriorating the heat exchange effect. At the same time, the dirt on the heat exchanger will also breed a large number of bacteria, which is detrimental to the health of users and affects customer experience. Therefore, the indoor heat exchanger of the air conditioner should be cleaned regularly.

[0003] Most of the existing air conditioners with self-cleaning function use the method of first frosting the heat exchanger and then defrosting to clean the dust. Generally, users will switch to cooling mode or heating mode after the air conditioner self-cleans. For example, when the user wants to cool down, the self-cleaning and defrosting stage is in progress. The hot air from defrosting increases the indoor heat load, affecting the user experience. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present application provides a self-cleaning control method, device, system and air conditioner for an indoor heat exchanger of an air conditioner, so as to solve the problem that frosting and defrosting will affect the user experience during the existing self-cleaning process.

[0005] The technical solution adopted by this application to solve its technical problem is:

[0006] In a first aspect, a self-cleaning control method for an indoor heat exchanger of an air conditioner is provided, comprising:

[0007] After the air conditioner enters the self-cleaning mode of the indoor unit heat exchanger, the indoor temperature is obtained in real time, and the difference between the indoor temperature and the indoor set temperature is calculated;

[0008] The air conditioner is controlled by adopting a first control strategy corresponding to a preset interval where the difference value is located, and when a first preset condition is met, the indoor heat exchanger of the air conditioner is controlled to be frosted;

[0009] When the defrosting condition is triggered, the air conditioner indoor heat exchanger is defrosted.

[0010] Furthermore, it also includes:

[0011] When the indoor heat exchanger of the air conditioner is defrosted, the air conditioner is controlled by adopting a second control strategy corresponding to the preset interval where the difference value is located, and the ventilation stage is entered when the second preset condition is met;

[0012] When the ventilation time is equal to the preset ventilation time, exit the self-cleaning mode.

[0013] Furthermore, the air conditioner is controlled by using a second control strategy corresponding to the preset interval where the difference is located, and the ventilation stage is entered when a second preset condition is met, including:

[0014] When the difference is greater than the first preset difference, the corresponding second control strategy includes adjusting the indoor fan to stop and adjusting the fan blade angle to decrease;

[0015] If, within the first preset time period when the air conditioner is controlled by the second control strategy, the difference is less than or equal to the first preset difference and greater than or equal to the second preset difference, it is judged that the second preset condition is met and the ventilation stage is entered immediately; if, within the first preset time period, the difference is always greater than the first preset difference, then after the first preset time period, it is judged that the second preset condition is met and the ventilation stage is entered.

[0016] Furthermore, the air conditioner is controlled by using a second control strategy corresponding to the preset interval where the difference is located, and the ventilation stage is entered when a second preset condition is met, including:

[0017] When the difference is less than or equal to the first preset difference and greater than or equal to the second preset difference, the corresponding second control strategy includes maintaining the current compressor frequency;

[0018] If the duration of maintaining the current compressor frequency is equal to the second preset duration, it is determined that the second preset condition is met and the ventilation stage is entered.

[0019] Furthermore, the air conditioner is controlled by using a second control strategy corresponding to the preset interval where the difference is located, and the ventilation stage is entered when a second preset condition is met, including:

[0020] When the difference is less than a second preset difference, the corresponding second control strategy includes increasing the compressor frequency at a first preset rate;

[0021] If, within the third preset time period when the air conditioner is controlled by the second control strategy, the difference is less than or equal to the first preset difference and greater than or equal to the second preset difference, it is judged that the second preset condition is met and the ventilation stage is entered immediately; if, within the third preset time period, the difference is always less than the second preset difference, then after the third preset time period, it is judged that the second preset condition is met and the ventilation stage is entered.

[0022] Furthermore, it also includes:

[0023] When the difference is less than or equal to a third preset difference, the corresponding second control strategy further includes turning on the indoor fan, and the third preset difference is less than the second preset difference.

[0024] Further, the air conditioner is controlled by adopting a first control strategy corresponding to a preset interval where the difference value is located, and when a first preset condition is met, the indoor heat exchanger of the air conditioner is controlled to frost, including:

[0025] When the difference is greater than a fourth preset difference, the corresponding first control strategy includes increasing the current compressor frequency at a second preset rate;

[0026] If, within the fourth preset time period when the first control strategy is used to control the air conditioner, the difference is less than or equal to the fourth preset difference and greater than or equal to the fifth preset difference, it is judged that the first preset condition is met, and the indoor heat exchanger of the air conditioner is immediately controlled to form frost; if within the fourth preset time period, the difference is always greater than the fourth preset difference, then after the fourth preset time period, it is judged that the first preset condition is met, and the indoor heat exchanger of the air conditioner is controlled to form frost.

[0027] Further, the air conditioner is controlled by adopting a first control strategy corresponding to a preset interval where the difference value is located, and when a first preset condition is met, the indoor heat exchanger of the air conditioner is controlled to frost, including:

[0028] When the difference is less than or equal to the fourth preset difference and greater than or equal to the fifth preset difference, the corresponding first control strategy includes maintaining the current compressor frequency;

[0029] If the duration of maintaining the current compressor frequency is equal to the fifth preset duration, it is determined that the first preset condition is met, and the air conditioner indoor heat exchanger is controlled to frost.

[0030] Further, the air conditioner is controlled by adopting a first control strategy corresponding to a preset interval where the difference value is located, and when a first preset condition is met, the indoor heat exchanger of the air conditioner is controlled to frost, including:

[0031] When the difference is less than the fifth preset difference, the corresponding first control strategy includes reducing the frequency of the indoor fan at a third preset rate and adjusting the fan blade to a minimum angle;

[0032] If within the sixth preset time period of controlling the air conditioner using the first control strategy, the difference is less than or equal to the first preset difference and greater than or equal to the second preset difference, it is judged that the first preset condition is met, and the indoor heat exchanger of the air conditioner is immediately controlled to form frost; if within the sixth preset time period, the difference is always less than the fifth preset difference, then after the sixth preset time period, it is judged that the first preset condition is met, and the indoor heat exchanger of the air conditioner is controlled to form frost.

[0033] Furthermore, it also includes:

[0034] When the frosting time is greater than or equal to the preset frosting time, the defrosting condition is triggered;

[0035] Alternatively, when the coil temperature of the indoor heat exchanger is less than or equal to a preset frost temperature, the defrost condition is triggered.

[0036] Furthermore, it also includes:

[0037] Get the actual indoor humidity, the cumulative time since the last cleaning, and the cumulative startup time since the last cleaning;

[0038] The preset frosting duration is calculated based on the difference, the actual indoor humidity, the cumulative duration, and the cumulative startup operation duration, and the calculation formula is as follows:

[0039] Preset frosting time = preset reference value + first correction coefficient * difference + second correction coefficient * (actual indoor humidity - reference humidity) + third correction coefficient * (cumulative time - cumulative startup running time) + fourth correction coefficient * cumulative startup running time.

[0040] Furthermore, it also includes:

[0041] The preset frosting temperature is determined based on the difference, and the larger the difference is, the larger the frosting temperature is.

[0042] Furthermore, it also includes:

[0043] When controlling the frosting of the indoor heat exchanger of the air conditioner, obtaining the coil temperature of the indoor heat exchanger;

[0044] When the coil temperature is greater than the preset coil temperature, the coil temperature is reduced by at least one of the following methods:

[0045] Can increase the operating frequency of the compressor;

[0046] and / or reduce the speed of the indoor fan;

[0047] And / or reduce the opening of the electronic expansion valve.

[0048] In a second aspect, a self-cleaning control device for an indoor heat exchanger of an air conditioner is provided, comprising:

[0049] A temperature difference acquisition module, used to acquire the indoor temperature in real time after the air conditioner enters the self-cleaning mode of the indoor unit heat exchanger, and calculate the difference between the indoor temperature and the indoor set temperature;

[0050] An air conditioner frosting control module, configured to control the air conditioner by adopting a first control strategy corresponding to a preset interval in which the difference value is located, and to control the frosting of an indoor heat exchanger of the air conditioner when a first preset condition is met;

[0051] The air conditioner defrost control module is used to defrost the air conditioner indoor heat exchanger when the defrost condition is triggered.

[0052] In a third aspect, a self-cleaning control system for an indoor heat exchanger of an air conditioner is provided, characterized in that it includes:

[0053] at least one processor and at least one memory;

[0054] The memory stores executable instructions of the processor;

[0055] The processor is configured to execute the above-mentioned air conditioner indoor heat exchanger self-cleaning control method.

[0056] In a fourth aspect, an air conditioner is provided, which applies the above-mentioned self-cleaning control method for the indoor heat exchanger of the air conditioner.

[0057] Beneficial effects:

[0058] The technical solution of the present application provides a self-cleaning control method, device, system and air conditioner for an indoor heat exchanger of an air conditioner. After the air conditioner enters the self-cleaning mode of the indoor heat exchanger, the indoor temperature is obtained in real time, and the difference between the indoor temperature and the indoor set temperature is calculated. The air conditioner is controlled by a first control strategy corresponding to a preset interval where the difference is located, and when the first preset condition is met, the indoor heat exchanger of the air conditioner is controlled to frost; when the defrosting condition is triggered, the indoor heat exchanger of the air conditioner is defrosted. When the indoor heat exchanger of the air conditioner is defrosted, the air conditioner is controlled by a second control strategy corresponding to a preset interval where the difference is located, and when the second preset condition is met, the ventilation stage is entered; when the ventilation time is equal to the preset ventilation time, the self-cleaning mode is exited. The solution of the present application controls the air conditioner according to the difference between the indoor temperature and the indoor set temperature before frosting, and also controls the air conditioner according to the difference during defrosting, so that the indoor temperature is not affected as much as possible during frosting and defrosting, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0060] Figure 1 This is a flow chart of a self-cleaning control method for an indoor heat exchanger of an air conditioner provided in an embodiment of the present application;

[0061] Figure 2 It is a flow chart of another method for controlling the self-cleaning of an indoor heat exchanger of an air conditioner provided in an embodiment of the present application;

[0062] Figure 3This is a flow chart of a specific self-cleaning control method for an indoor heat exchanger of an air conditioner provided in an embodiment of the present application;

[0063] Figure 4 It is a structural schematic diagram of a self-cleaning control device for an indoor heat exchanger of an air conditioner provided in an embodiment of the present application;

[0064] Figure 5 It is a structural schematic diagram of a self-cleaning control system for an air-conditioning indoor heat exchanger provided in an embodiment of the present application. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application is described in detail below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other implementation methods obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0066] Reference Figure 1 The embodiment of the present application provides a self-cleaning control method for an indoor heat exchanger of an air conditioner, comprising:

[0067] S11: After the air conditioner enters the self-cleaning mode of the indoor unit heat exchanger, the indoor temperature is obtained in real time, and the difference between the indoor temperature and the indoor set temperature is calculated;

[0068] The entering of the self-cleaning mode may be in response to a user's instruction, or may be triggered by detecting corresponding parameters to enter the self-cleaning mode of the indoor unit heat exchanger, which is not limited in the present application.

[0069] S12: Controlling the air conditioner using a first control strategy corresponding to a preset interval where the difference value is located, and controlling the indoor heat exchanger of the air conditioner to frost when a first preset condition is met.

[0070] As a preferred implementation of the embodiment of the present application, when the difference is greater than the fourth preset difference, the corresponding first control strategy includes increasing the current compressor frequency at a second preset rate; when the difference is greater than the fourth preset difference, the indoor temperature needs to be lowered, so the compressor frequency is controlled to increase before frosting, the air conditioning refrigeration capacity is increased, and the indoor temperature is reduced faster. It is understandable that when the compressor frequency is increased, the upper limit shall not exceed the maximum allowable value. If it is reached, the highest allowable value is maintained.

[0071] If within the fourth preset time period of controlling the air conditioner using the first control strategy, the difference is less than or equal to the fourth preset difference and greater than or equal to the fifth preset difference, it is judged that the first preset condition is met, and the indoor heat exchanger of the air conditioner is immediately controlled to frost; that is, after increasing the compressor frequency, the difference reaches the target temperature range, so frosting can be directly entered, and the impact on the indoor temperature is relatively small at this time.

[0072] If the difference is always greater than the fourth preset difference within the fourth preset time, then after the fourth preset time, it is determined that the first preset condition is met, and the air conditioner indoor heat exchanger is controlled to frost. Among them, the fourth preset difference is greater than 0 and the fifth preset difference is less than 0. That is, even if the compressor frequency is increased, the difference cannot reach the target temperature range at this time. If it is still operated according to this scheme, self-cleaning will not be possible. Therefore, the fourth preset time is set to ensure that frosting can be performed.

[0073] It is understandable that when the difference is in other intervals, frosting may be performed directly without control, or control may be performed according to the preferred scheme provided in the following embodiments.

[0074] Preferably, when the difference is less than or equal to the fourth preset difference and greater than or equal to the fifth preset difference, the corresponding first control strategy includes maintaining the current compressor frequency; at this time, the difference is within the target temperature range, so there is no need to change the compressor frequency.

[0075] If the duration of maintaining the current compressor frequency is equal to the fifth preset duration, it is determined that the first preset condition is met, and the air conditioner indoor heat exchanger is controlled to frost. The fifth preset duration is set to ensure that the frosting stage can be entered.

[0076] Preferably, when the difference is less than the fifth preset difference, the corresponding first control strategy includes reducing the frequency of the indoor fan at a third preset rate and adjusting the fan blades to a minimum angle; at this time, the indoor temperature is lower than the indoor set temperature and the indoor temperature needs to be raised, but because frosting is required, the air conditioner is in cooling mode and it is necessary to reduce the heat exchange between the indoor heat exchanger and the indoor air, that is, reduce the frequency of the indoor fan and adjust the fan blades to a minimum angle to avoid cold wind blowing on people.

[0077] If within the sixth preset time period of controlling the air conditioner using the first control strategy, the difference is less than or equal to the first preset difference and greater than or equal to the second preset difference, it is judged that the first preset condition is met, and the indoor heat exchanger of the air conditioner is immediately controlled to form frost; if within the sixth preset time period, the difference is always less than the fifth preset difference, then after the sixth preset time period, it is judged that the first preset condition is met, and the indoor heat exchanger of the air conditioner is controlled to form frost.

[0078] As a preferred implementation method of the embodiment of the present application, it also includes:

[0079] When controlling the frosting of the indoor heat exchanger of the air conditioner, obtaining the coil temperature of the indoor heat exchanger;

[0080] When the coil temperature is greater than the preset coil temperature, the coil temperature is reduced by at least one of the following methods:

[0081] Can increase the operating frequency of the compressor;

[0082] and / or reduce the speed of the indoor fan;

[0083] And / or reduce the opening of the electronic expansion valve.

[0084] S13: When the defrosting condition is triggered, defrosting the indoor heat exchanger of the air conditioner.

[0085] As an optional implementation method of the embodiment of the present application, when the frosting time is greater than or equal to the preset frosting time, the defrosting condition is triggered.

[0086] In one embodiment, the preset frosting duration is a fixed value.

[0087] In another embodiment, the preset frosting time is determined according to actual parameters.

[0088] Get the actual indoor humidity, the cumulative time since the last cleaning, and the cumulative startup time since the last cleaning;

[0089] The preset frosting duration is calculated based on the difference, the actual indoor humidity, the cumulative duration, and the cumulative startup operation duration, and the calculation formula is as follows:

[0090] Preset frosting time = preset reference value + first correction coefficient * difference + second correction coefficient * (actual indoor humidity - reference humidity) + third correction coefficient * (cumulative time - cumulative startup running time) + fourth correction coefficient * cumulative startup running time.

[0091] As another optional implementation of the embodiment of the present application, when the coil temperature of the indoor heat exchanger is less than or equal to a preset frost temperature, the defrost condition is triggered.

[0092] In one embodiment, the preset frosting temperature is a fixed value.

[0093] In another embodiment, the preset frosting temperature is determined according to actual parameters, exemplarily: the preset frosting temperature is determined based on the difference, and the larger the difference is, the larger the frosting temperature is.

[0094] It should be noted that, in the embodiment of the present application, ventilation is directly performed after defrosting, and then the self-cleaning mode is exited, wherein no improvement is made to the defrosting and ventilation stages.

[0095] like Figure 2 As shown, the embodiment of the present application provides another self-cleaning control method for an indoor heat exchanger of an air conditioner, the method comprising:

[0096] S21: After the air conditioner enters the self-cleaning mode of the indoor unit heat exchanger, the indoor temperature is obtained in real time, and the difference between the indoor temperature and the indoor set temperature is calculated.

[0097] S22: Control the air conditioner using a first control strategy corresponding to a preset interval where the difference value is located, and control the indoor heat exchanger of the air conditioner to frost when a first preset condition is met.

[0098] S23: when the defrosting condition is triggered, defrosting the indoor heat exchanger of the air conditioner; when defrosting the indoor heat exchanger of the air conditioner, controlling the air conditioner by adopting a second control strategy corresponding to the preset interval where the difference value is located;

[0099] S24: When the second preset condition is met, the ventilation stage is entered; when the ventilation time is equal to the preset ventilation time, the self-cleaning mode is exited.

[0100] The repeated part and Figure 1 The solutions provided by the illustrated embodiments are the same, and reference may be made to the above embodiments, which will not be described in detail here.

[0101] and Figure 1 The difference between the illustrated embodiments is that further control is performed based on the difference during the defrost stage, so that the defrost stage can also avoid the impact of defrost on the indoor temperature, thereby improving the user experience.

[0102] The air conditioner is controlled by adopting a second control strategy corresponding to the preset interval where the difference value is located, and the ventilation stage is entered when a second preset condition is met, including:

[0103] When the difference is greater than the first preset difference, the corresponding second control strategy includes adjusting the indoor fan to stop and adjusting the fan blade angle to decrease;

[0104] If the difference is less than or equal to the first preset difference and greater than or equal to the second preset difference within the first preset time period when the air conditioner is controlled by the second control strategy, the second preset condition is determined to be met and the ventilation stage is entered immediately; if the difference is always greater than the first preset difference within the first preset time period, the second preset condition is determined to be met after the first preset time period and the ventilation stage is entered. The first preset difference is greater than 0 and the second preset difference is less than 0.

[0105] It can be understood that when the difference is in other intervals, defrosting may be performed directly without control, or control may be performed according to the preferred scheme provided in the following embodiments.

[0106] Preferably, when the difference is less than or equal to the first preset difference and greater than or equal to the second preset difference, the corresponding second control strategy includes maintaining the current compressor frequency;

[0107] If the duration of maintaining the current compressor frequency is equal to the second preset duration, it is determined that the second preset condition is met and the ventilation stage is entered.

[0108] Preferably, when the difference is less than a second preset difference, the corresponding second control strategy includes increasing the compressor frequency at a first preset rate;

[0109] If, within the third preset time period when the air conditioner is controlled by the second control strategy, the difference is less than or equal to the first preset difference and greater than or equal to the second preset difference, it is judged that the second preset condition is met and the ventilation stage is entered immediately; if, within the third preset time period, the difference is always less than the second preset difference, then after the third preset time period, it is judged that the second preset condition is met and the ventilation stage is entered.

[0110] In addition, when the difference is less than or equal to the third preset difference, the corresponding second control strategy also includes turning on the indoor fan, and the third preset difference is less than the second preset difference. That is, when the difference is less than or equal to the third preset difference, not only the compressor frequency is increased but also the indoor fan is turned on. In other words, when the difference is less than the second preset difference and greater than the third preset difference, only the compressor frequency is increased without turning on the indoor fan.

[0111] The self-cleaning control method for the indoor heat exchanger of the air conditioner provided in the embodiment of the present application obtains the indoor temperature in real time after the air conditioner enters the self-cleaning mode of the indoor unit heat exchanger, calculates the difference between the indoor temperature and the indoor set temperature, and controls the air conditioner using the first control strategy corresponding to the preset interval where the difference is located, and controls the indoor heat exchanger of the air conditioner to frost when the first preset condition is met; and defrosts the indoor heat exchanger of the air conditioner when the defrost condition is triggered. When defrosting the indoor heat exchanger of the air conditioner, the air conditioner is controlled using the second control strategy corresponding to the preset interval where the difference is located, and enters the ventilation stage when the second preset condition is met; and exits the self-cleaning mode when the ventilation time is equal to the preset ventilation time. The present application scheme controls the air conditioner according to the difference between the indoor temperature and the indoor set temperature before frosting, and also controls the air conditioner according to the difference during defrosting, so that the indoor temperature is not affected as much as possible during frosting and defrosting, thereby improving the user experience.

[0112] In order to more clearly illustrate the present application scheme, Figure 3As shown, a specific self-cleaning control method for an indoor heat exchanger of an air conditioner is provided, which mainly includes three stages: frosting inner loop control - defrosting inner loop control - ventilation. The specific control method is as follows:

[0113] 1) Responding to the air conditioner self-cleaning instruction and receiving the inner loop control parameters required by the user, wherein the inner loop control parameters include the inner loop target temperature Tb.

[0114] 2) Obtain the current indoor ambient temperature T1, and enter the refrigeration and frosting inner loop control stage by judging the range of K=T1-Tb.

[0115] 3) It can be understood that: ① When K is too large, K>3℃, the inner loop T1 is much different from Tb at this time, and the indoor temperature needs to be lowered to reach the user's required temperature Tb, and the current operating mode is the self-cleaning refrigeration and frosting mode. The current compressor frequency F is adjusted to increase at a rate of 2Hz / 20S, and the increase in F does not exceed the current maximum frequency Fmax of the air conditioner. The fan blades sweep the air, which can make the inner loop T1 drop within a certain period of time. If K does not drop to the target range temperature of -3℃≤K≤3℃ within 180S, the next step of regulation is entered. The advantage of controlling K within the target range is that the ambient temperature is controlled to be close to the temperature set by the user, so that the self-cleaning process also participates in the control of the ambient temperature, and when the difference between the user-set temperature and the actual ambient temperature is too large, effective heating or cooling can be achieved.

[0116] ②If K<-3℃, then the inner ring T1 is smaller than Tb, and the indoor temperature needs to be raised to reach the temperature required by the user. The current mode is self-cleaning and frosting. In order not to increase the indoor cooling load, the indoor fan is reduced at a rate of 10r / 2S, and the minimum angle of the fan blade is adjusted. The upward air flow does not send air to the human activity area. The speed reduction can shorten the defrost time and improve the frosting efficiency. If K does not drop to the target range temperature of -3℃≤K≤3℃ within 120S, the next step of regulation will be entered.

[0117] ③ If the range of K drops to the interval of -3℃≤K≤3℃, maintain the current frequency and speed. If it can be maintained for 90S, the indoor heat exchange at this moment can maintain a relatively stable state, and the pipe temperature control stage of refrigeration and frosting is carried out.

[0118] 4) Frosting control is currently being performed, and the angle of the fan blades needs to be adjusted to the minimum to ensure that the cold air is not excessively discharged into the room. The first refrigeration frosting time t1 is obtained. T1 is related to K, indoor humidity φ%, cumulative startup operation time C, and the last self-cleaning cumulative time X. The longer the cumulative startup operation time C, the more indoor dirt, and the longer the required t1, which is proportional. Similarly, the longer the interval time X from the last self-cleaning to this self-cleaning, the longer the required t1. Where C is within X. The higher the indoor humidity φ%, the higher the dew point temperature, and the more condensed water is produced under the same indoor heat exchanger air, the better the frosting effect, and the shorter the time used. T1 is also related to K. The larger K is, the longer the time required can ensure that the indoor temperature T1 drops within a certain period of time. The smaller K is, the shorter the frosting time is, avoiding excessive cooling output to the indoor room. Therefore, the first refrigeration frosting time t1 = t0 + Z1*K-Z2*(φ%-β%) + Z3*(XC) + Z4*C (related formula). Among them, β% is the reference value of indoor relative humidity, t0 is the reference value of the first refrigeration frosting time, and Z1, Z2, Z3, and Z4 are all correction coefficients.

[0119] 5) Refrigeration frosting requires the internal pipe temperature to reach a target temperature to ensure that the indoor heat exchanger is frosted, and the frost is combined with dirt such as dust. It can be understood that when the air conditioner is in the frost-free stage, the indoor coil temperature is negatively correlated with the operating frequency of the compressor, the indoor coil temperature is positively correlated with the speed of the indoor fan, and the indoor coil temperature is positively correlated with the opening of the electronic expansion valve. When the indoor coil temperature is high, the operating frequency of the compressor can be increased, and / or the speed of the indoor fan can be reduced, and / or the opening of the electronic expansion valve can be reduced to reduce the indoor coil temperature; when the internal pipe temperature drops to the first refrigeration frosting target temperature T2, T2 can be obtained by the formula T2 = Tb + Z5 * KD. Where D is the reference correction temperature value. It should be noted that the refrigeration frosting target temperature T2 in the above formula is not a fixed value, but a range of values.

[0120] 6) When the air conditioner is in the refrigeration and frosting stage and the duration reaches the first refrigeration and frosting duration t1 and / or the inner pipe temperature of the air conditioner drops to the first refrigeration and frosting inner pipe temperature target temperature T2, the frosting inner loop control stage is terminated.

[0121] 7) Determine the range of T1-Tb=K, and enter the heating and defrosting inner loop control stage. ① When K>3℃, adjust the indoor fan to stop, and adjust the fan blade angle to decrease. If this stage is maintained for 120S, proceed to the next step. ② When -3℃≤K≤3℃, maintain the current frequency and speed. If it can be maintained for 90S, enter the ventilation mode. ③ When K<-3℃, increase the compressor frequency every 2Hz / 20S. If K≤-10℃, turn on the indoor fan. If this stage is maintained for 180S, proceed to the next step.

[0122] 8) Entering the ventilation stage, when the second preset ventilation time t2 is reached, the self-cleaning mode is exited.

[0123] Based on the same inventive concept, Figure 4 As shown, the present application also provides a self-cleaning control device 40 for an indoor heat exchanger of an air conditioner, comprising:

[0124] The temperature difference acquisition module 41 is used to acquire the indoor temperature in real time after the air conditioner enters the self-cleaning mode of the indoor unit heat exchanger, and calculate the difference between the indoor temperature and the indoor set temperature.

[0125] An air conditioner frosting control module 42, configured to control the air conditioner by adopting a first control strategy corresponding to a preset interval in which the difference value is located, and to control the indoor heat exchanger of the air conditioner to frost when a first preset condition is met;

[0126] The method of controlling the air conditioner by adopting a first control strategy corresponding to a preset interval where the difference value is located, and controlling the indoor heat exchanger of the air conditioner to frost when a first preset condition is met, comprises:

[0127] When the difference is greater than a fourth preset difference, the corresponding first control strategy includes increasing the current compressor frequency at a second preset rate;

[0128] If, within the fourth preset time period when the first control strategy is used to control the air conditioner, the difference is less than or equal to the fourth preset difference and greater than or equal to the fifth preset difference, it is judged that the first preset condition is met, and the indoor heat exchanger of the air conditioner is immediately controlled to form frost; if within the fourth preset time period, the difference is always greater than the fourth preset difference, then after the fourth preset time period, it is judged that the first preset condition is met, and the indoor heat exchanger of the air conditioner is controlled to form frost.

[0129] When the difference is less than or equal to the fourth preset difference and greater than or equal to the fifth preset difference, the corresponding first control strategy includes maintaining the current compressor frequency;

[0130] If the duration of maintaining the current compressor frequency is equal to the fifth preset duration, it is determined that the first preset condition is met, and the air conditioner indoor heat exchanger is controlled to frost.

[0131] When the difference is less than the fifth preset difference, the corresponding first control strategy includes reducing the frequency of the indoor fan at a third preset rate and adjusting the fan blade to a minimum angle;

[0132] If within the sixth preset time period of controlling the air conditioner using the first control strategy, the difference is less than or equal to the first preset difference and greater than or equal to the second preset difference, it is judged that the first preset condition is met, and the indoor heat exchanger of the air conditioner is immediately controlled to form frost; if within the sixth preset time period, the difference is always less than the fifth preset difference, then after the sixth preset time period, it is judged that the first preset condition is met, and the indoor heat exchanger of the air conditioner is controlled to form frost.

[0133] The air conditioner defrost control module 43 is used to defrost the indoor heat exchanger of the air conditioner when the defrost condition is triggered; when defrosting the indoor heat exchanger of the air conditioner, the air conditioner is controlled by adopting the second control strategy corresponding to the preset interval where the difference value is located;

[0134] The air conditioner is controlled by adopting a second control strategy corresponding to the preset interval where the difference value is located, and the ventilation stage is entered when a second preset condition is met, including:

[0135] When the difference is greater than the first preset difference, the corresponding second control strategy includes adjusting the indoor fan to stop and adjusting the fan blade angle to decrease;

[0136] If, within the first preset time period when the air conditioner is controlled by the second control strategy, the difference is less than or equal to the first preset difference and greater than or equal to the second preset difference, it is judged that the second preset condition is met and the ventilation stage is entered immediately; if, within the first preset time period, the difference is always greater than the first preset difference, then after the first preset time period, it is judged that the second preset condition is met and the ventilation stage is entered.

[0137] When the difference is less than or equal to the first preset difference and greater than or equal to the second preset difference, the corresponding second control strategy includes maintaining the current compressor frequency;

[0138] If the duration of maintaining the current compressor frequency is equal to the second preset duration, it is determined that the second preset condition is met and the ventilation stage is entered.

[0139] When the difference is less than a second preset difference, the corresponding second control strategy includes increasing the compressor frequency at a first preset rate;

[0140] If, within the third preset time period when the air conditioner is controlled by the second control strategy, the difference is less than or equal to the first preset difference and greater than or equal to the second preset difference, it is judged that the second preset condition is met and the ventilation stage is entered immediately; if, within the third preset time period, the difference is always less than the second preset difference, then after the third preset time period, it is judged that the second preset condition is met and the ventilation stage is entered.

[0141] Further, when the difference is less than or equal to a third preset difference, the corresponding second control strategy also includes turning on the indoor fan, and the third preset difference is less than the second preset difference.

[0142] In one embodiment, when the frosting time is greater than or equal to a preset frosting time, the defrosting condition is triggered.

[0143] Preferably, the actual indoor humidity, the cumulative time since the last cleaning, and the cumulative startup time since the last cleaning are obtained;

[0144] The preset frosting duration is calculated based on the difference, the actual indoor humidity, the cumulative duration, and the cumulative startup operation duration, and the calculation formula is as follows:

[0145] Preset frosting time = preset reference value + first correction coefficient * difference + second correction coefficient * (actual indoor humidity - reference humidity) + third correction coefficient * (cumulative time - cumulative startup running time) + fourth correction coefficient * cumulative startup running time.

[0146] In another embodiment, when the coil temperature of the indoor heat exchanger is less than or equal to a preset frosting temperature, the defrosting condition is triggered. Preferably, the preset frosting temperature is determined based on the difference, and the larger the difference, the larger the frosting temperature.

[0147] The cleaning mode exit module 44 is used to enter the ventilation stage when the second preset condition is met; when the ventilation time is equal to the preset ventilation time, exit the self-cleaning mode.

[0148] The air conditioner indoor heat exchanger self-cleaning control device provided in the embodiment of the present application obtains the indoor temperature in real time after the air conditioner enters the self-cleaning mode of the indoor unit heat exchanger, and calculates the difference between the indoor temperature and the indoor set temperature, and controls the air conditioner using the first control strategy corresponding to the preset interval where the difference is located, and controls the air conditioner indoor heat exchanger to frost when the first preset condition is met; when the defrost condition is triggered, the air conditioner indoor heat exchanger is defrosted. When defrosting the air conditioner indoor heat exchanger, the air conditioner is controlled using the second control strategy corresponding to the preset interval where the difference is located, and enters the ventilation stage when the second preset condition is met; when the ventilation time is equal to the preset ventilation time, the self-cleaning mode is exited. The present application scheme controls the air conditioner according to the difference between the indoor temperature and the indoor set temperature before frosting, and also controls the air conditioner according to the difference during defrosting, so that the indoor temperature is not affected as much as possible during frosting and defrosting, thereby improving the user experience.

[0149] Based on the same inventive concept, Figure 5 As shown, the present application also provides an air-conditioning indoor heat exchanger self-cleaning control system 50, comprising:

[0150] at least one processor 51 and at least one memory 52;

[0151] The memory stores executable instructions of the processor;

[0152] The processor is configured to execute the self-cleaning control method for the indoor heat exchanger of the air conditioner provided in the above embodiment.

[0153] The air conditioner indoor heat exchanger self-cleaning control system provided by the embodiment of the present application stores the executable instructions of the processor through the memory. When the executable instructions are executed, the processor can obtain the indoor temperature in real time after the air conditioner enters the self-cleaning mode of the indoor unit heat exchanger, and calculate the difference between the indoor temperature and the indoor set temperature, and control the air conditioner using the first control strategy corresponding to the preset interval where the difference is located, and control the air conditioner indoor heat exchanger to frost when the first preset condition is met; when the defrosting condition is triggered, the air conditioner indoor heat exchanger is defrosted. When the air conditioner indoor heat exchanger is defrosted, the air conditioner is controlled using the second control strategy corresponding to the preset interval where the difference is located, and enters the ventilation stage when the second preset condition is met; when the ventilation time is equal to the preset ventilation time, the self-cleaning mode is exited. The present application scheme controls the air conditioner according to the difference between the indoor temperature and the indoor set temperature before frosting, and also controls the air conditioner according to the difference during defrosting, so that the indoor temperature is not affected as much as possible during frosting and defrosting, thereby improving the user experience.

[0154] Based on the same inventive concept, the present application also provides an air conditioner, which uses the self-cleaning control method for the indoor heat exchanger of the air conditioner provided in the above embodiment.

[0155] The air conditioner provided in the embodiment of the present application, by applying the air conditioner indoor heat exchanger self-cleaning control method provided in the above embodiment, can obtain the indoor temperature in real time after the air conditioner enters the self-cleaning mode of the indoor unit heat exchanger, and calculate the difference between the indoor temperature and the indoor set temperature, and control the air conditioner using the first control strategy corresponding to the preset interval where the difference is located, and control the indoor heat exchanger of the air conditioner to frost when the first preset condition is met; when the defrosting condition is triggered, the indoor heat exchanger of the air conditioner is defrosted. When defrosting the indoor heat exchanger of the air conditioner, the second control strategy corresponding to the preset interval where the difference is located is used to control the air conditioner, and when the second preset condition is met, the ventilation stage is entered; when the ventilation time is equal to the preset ventilation time, the self-cleaning mode is exited. The present application scheme controls the air conditioner according to the difference between the indoor temperature and the indoor set temperature before frosting, and also controls the air conditioner according to the difference during defrosting, so that the indoor temperature is not affected as much as possible during frosting and defrosting, thereby improving the user experience.

[0156] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0157] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

Claims

1. A self-cleaning control method for an indoor heat exchanger of an air conditioner, characterized in that: include: After the air conditioner enters the self-cleaning mode of the indoor unit heat exchanger, the indoor temperature is obtained in real time, and the difference between the indoor temperature and the indoor set temperature is calculated; The air conditioner is controlled by adopting a first control strategy corresponding to a preset interval where the difference value is located, and when a first preset condition is met, the indoor heat exchanger of the air conditioner is controlled to be frosted; When the defrosting condition is triggered, the air conditioner indoor heat exchanger is defrosted.

2. The method according to claim 1, characterized in that Also includes: When the indoor heat exchanger of the air conditioner is defrosted, the air conditioner is controlled by adopting a second control strategy corresponding to the preset interval where the difference value is located, and the ventilation stage is entered when the second preset condition is met; When the ventilation time is equal to the preset ventilation time, exit the self-cleaning mode.

3. The method according to claim 2, characterized in that: The air conditioner is controlled by adopting a second control strategy corresponding to the preset interval where the difference value is located, and the ventilation stage is entered when a second preset condition is met, including: When the difference is greater than the first preset difference, the corresponding second control strategy includes adjusting the indoor fan to stop and adjusting the fan blade angle to decrease; If, within the first preset time period when the air conditioner is controlled by the second control strategy, the difference is less than or equal to the first preset difference and greater than or equal to the second preset difference, it is judged that the second preset condition is met and the ventilation stage is entered immediately; if, within the first preset time period, the difference is always greater than the first preset difference, then after the first preset time period, it is judged that the second preset condition is met and the ventilation stage is entered.

4. The method according to claim 2, characterized in that: The air conditioner is controlled by adopting a second control strategy corresponding to the preset interval where the difference value is located, and the ventilation stage is entered when a second preset condition is met, including: When the difference is less than or equal to the first preset difference and greater than or equal to the second preset difference, the corresponding second control strategy includes maintaining the current compressor frequency; If the duration of maintaining the current compressor frequency is equal to the second preset duration, it is determined that the second preset condition is met and the ventilation stage is entered.

5. The method according to claim 2, characterized in that: The air conditioner is controlled by adopting a second control strategy corresponding to the preset interval where the difference value is located, and the ventilation stage is entered when a second preset condition is met, including: When the difference is less than a second preset difference, the corresponding second control strategy includes increasing the compressor frequency at a first preset rate; If, within the third preset time period when the air conditioner is controlled by the second control strategy, the difference is less than or equal to the first preset difference and greater than or equal to the second preset difference, it is judged that the second preset condition is met and the ventilation stage is entered immediately; if, within the third preset time period, the difference is always less than the second preset difference, then after the third preset time period, it is judged that the second preset condition is met and the ventilation stage is entered.

6. The method according to claim 5, characterized in that Also includes: When the difference is less than or equal to a third preset difference, the corresponding second control strategy further includes turning on the indoor fan, and the third preset difference is less than the second preset difference.

7. The method according to claim 1, characterized in that: The method of controlling the air conditioner by adopting a first control strategy corresponding to a preset interval where the difference value is located, and controlling the indoor heat exchanger of the air conditioner to frost when a first preset condition is met, comprises: When the difference is greater than a fourth preset difference, the corresponding first control strategy includes increasing the current compressor frequency at a second preset rate; If, within the fourth preset time period when the first control strategy is used to control the air conditioner, the difference is less than or equal to the fourth preset difference and greater than or equal to the fifth preset difference, it is judged that the first preset condition is met, and the indoor heat exchanger of the air conditioner is immediately controlled to form frost; if within the fourth preset time period, the difference is always greater than the fourth preset difference, then after the fourth preset time period, it is judged that the first preset condition is met, and the indoor heat exchanger of the air conditioner is controlled to form frost.

8. The method according to claim 1, characterized in that: The method of controlling the air conditioner by adopting a first control strategy corresponding to a preset interval where the difference value is located, and controlling the indoor heat exchanger of the air conditioner to frost when a first preset condition is met, comprises: When the difference is less than or equal to the fourth preset difference and greater than or equal to the fifth preset difference, the corresponding first control strategy includes maintaining the current compressor frequency; If the duration of maintaining the current compressor frequency is equal to the fifth preset duration, it is determined that the first preset condition is met, and the air conditioner indoor heat exchanger is controlled to frost.

9. The method according to claim 1, characterized in that: The method of controlling the air conditioner by adopting a first control strategy corresponding to a preset interval where the difference value is located, and controlling the indoor heat exchanger of the air conditioner to frost when a first preset condition is met, comprises: When the difference is less than the fifth preset difference, the corresponding first control strategy includes reducing the frequency of the indoor fan at a third preset rate and adjusting the fan blade to a minimum angle; If within the sixth preset time period of controlling the air conditioner using the first control strategy, the difference is less than or equal to the first preset difference and greater than or equal to the second preset difference, it is judged that the first preset condition is met, and the indoor heat exchanger of the air conditioner is immediately controlled to form frost; if within the sixth preset time period, the difference is always less than the fifth preset difference, then after the sixth preset time period, it is judged that the first preset condition is met, and the indoor heat exchanger of the air conditioner is controlled to form frost.

10. The method according to claim 1, characterized in that Also includes: When the frosting time is greater than or equal to the preset frosting time, the defrosting condition is triggered; Alternatively, when the coil temperature of the indoor heat exchanger is less than or equal to a preset frost temperature, the defrost condition is triggered.

11. The method according to claim 10, characterized in that Also includes: Get the actual indoor humidity, the cumulative time since the last cleaning, and the cumulative startup time since the last cleaning; The preset frosting duration is calculated based on the difference, the actual indoor humidity, the cumulative duration, and the cumulative startup operation duration, and the calculation formula is as follows: Preset frosting time = preset reference value + first correction coefficient * difference + second correction coefficient * (actual indoor humidity - reference humidity) + third correction coefficient * (cumulative time - cumulative startup running time) + fourth correction coefficient * cumulative startup running time.

12. The method according to claim 10, characterized in that Also includes: The preset frosting temperature is determined based on the difference, and the larger the difference is, the larger the frosting temperature is.

13. The method according to claim 1, characterized in that Also includes: When controlling the frosting of the indoor heat exchanger of the air conditioner, obtaining the coil temperature of the indoor heat exchanger; When the coil temperature is greater than the preset coil temperature, the coil temperature is reduced by at least one of the following methods: Can increase the operating frequency of the compressor; and / or reduce the speed of the indoor fan; And / or reduce the opening of the electronic expansion valve.

14. A self-cleaning control device for an indoor heat exchanger of an air conditioner, characterized in that: include: A temperature difference acquisition module, used to acquire the indoor temperature in real time after the air conditioner enters the self-cleaning mode of the indoor unit heat exchanger, and calculate the difference between the indoor temperature and the indoor set temperature; An air conditioner frosting control module, configured to control the air conditioner by adopting a first control strategy corresponding to a preset interval in which the difference value is located, and to control the frosting of an indoor heat exchanger of the air conditioner when a first preset condition is met; The air conditioner defrost control module is used to defrost the air conditioner indoor heat exchanger when the defrost condition is triggered.

15. A self-cleaning control system for an indoor heat exchanger of an air conditioner, characterized in that: include: at least one processor and at least one memory; The memory stores executable instructions of the processor; The processor is configured to execute the method according to any one of claims 1-13.

16. An air conditioner, characterized in that: The method according to any one of claims 1 to 13 is used.

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