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

Abstract

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

Description

TECHNICAL FIELD

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

[0002] Air conditioners have been used frequently in homes, and indoor heat exchangers can generate a large amount of dust, with a large amount of dust adhering to the heat exchanger, causing the heat exchanger to accumulate dust, thereby increasing the air resistance and hindering air flow, which deteriorates the heat exchange effect. At the same time, the dust on the heat exchanger can also breed a large amount of bacteria, which is not conducive to the health of users and affects customer experience. Therefore, the air conditioner indoor heat exchanger needs to be cleaned regularly.

[0003] Existing air conditioners with self-cleaning function mostly use the method of frosting and defrosting of the heat exchanger to clean the dust. Generally, users will perform cooling mode or heating mode after air conditioner self-cleaning, such as when the user wants to cool down, at which time the self-cleaning defrosting stage is being performed, and the hot air of defrosting increases the indoor heat load, affecting the user experience. SUMMARY

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

[0005] The technical solution adopted by the present application to solve its technical problems is:

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

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

[0008] The air conditioner is controlled by using the first control strategy corresponding to the preset interval in which the difference value is located, and the air conditioner indoor heat exchanger is controlled to frost when the first preset condition is met;

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

[0010] Further, it further comprises:

[0011] When the air conditioner indoor heat exchanger is defrosted, the air conditioner is controlled by using the second control strategy corresponding to the preset interval in which the difference value is located, and enters the ventilation stage when the second preset condition is met;

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

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

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

[0015] If, within a first preset time period during which the second control strategy is used to control the air conditioner, the difference value is less than or equal to the first preset difference value and greater than or equal to a second preset difference value, it is determined that the second preset condition is met, and the ventilation stage is immediately entered. If, within the first preset time period, the difference value is always greater than the first preset difference value, it is determined that the second preset condition is met after the first preset time period, and the ventilation stage is entered.

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

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

[0018] If the time period during which the current compressor frequency is maintained is equal to a second preset time period, it is determined that the second preset condition is met, and the ventilation stage is entered.

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

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

[0021] If, within a third preset time period during which the second control strategy is used to control the air conditioner, the difference value is less than or equal to the first preset difference value and greater than or equal to the second preset difference value, it is determined that the second preset condition is met, and the ventilation stage is immediately entered. If, within the third preset time period, the difference value is always less than the second preset difference value, it is determined that the second preset condition is met after the third preset time period, and the ventilation stage is entered.

[0022] Further, it further includes:

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

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

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

[0026] If the difference value is less than or equal to the fourth preset difference value and greater than or equal to a fifth preset difference value within a fourth preset time period during which the first control strategy is adopted to control the air conditioner, it is determined that the first preset condition is met, and the indoor heat exchanger of the air conditioner is immediately controlled to frost; if the difference value is always greater than the fourth preset difference value within the fourth preset time period, it is determined that the first preset condition is met after the fourth preset time period, and the indoor heat exchanger of the air conditioner is controlled to frost.

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

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

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

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

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

[0032] If the difference value is less than or equal to the first preset difference value and greater than or equal to a second preset difference value within a sixth preset time period during which the first control strategy is adopted to control the air conditioner, it is determined that the first preset condition is met, and the indoor heat exchanger of the air conditioner is immediately controlled to frost; if the difference value is always less than the fifth preset difference value within the sixth preset time period, it is determined that the first preset condition is met after the sixth preset time period, and the indoor heat exchanger of the air conditioner is controlled to frost.

[0033] Further, it further includes:

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

[0035] Or, when the coil temperature of the indoor heat exchanger is less than or equal to a preset frosting temperature, a defrosting condition is triggered.

[0036] Further, it further comprises:

[0037] The actual indoor humidity, the cumulative time length after the last cleaning, and the cumulative running time length after the last cleaning are obtained.

[0038] A preset frosting time length is calculated based on the difference, the actual indoor humidity, the cumulative time length, and the cumulative running time length, and the calculation formula is as follows:

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

[0040] Further, it further comprises:

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

[0042] Further, it further comprises:

[0043] When the frosting of the indoor heat exchanger of the air conditioner is controlled, the coil temperature of the indoor heat exchanger is obtained.

[0044] When the coil temperature is greater than a preset coil temperature, at least one of the following methods is used to reduce the coil temperature:

[0045] The operating frequency of the compressor can be increased;

[0046] And / or the speed of the indoor fan is reduced;

[0047] And / or the opening degree of the electronic expansion valve is reduced.

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

[0049] A temperature difference value acquisition module is configured to obtain the indoor temperature in real time after the air conditioner enters the self-cleaning mode of the indoor heat exchanger, and calculate the difference between the indoor temperature and the indoor set temperature.

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

[0051] An air conditioner defrosting control module is configured to defrost the indoor heat exchanger of the air conditioner when a defrosting condition is triggered.

[0052] In a third aspect, a self-cleaning control system for an indoor heat exchanger of an air conditioner is provided, and has the following features.

[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 self-cleaning control method for the indoor heat exchanger of the air conditioner.

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

[0057] Advantages:

[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 acquired in real time, and the difference between the indoor temperature and the indoor set temperature is calculated. The first control strategy corresponding to the preset interval in which the difference is located is used to control the air conditioner, and the indoor heat exchanger of the air conditioner is controlled 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 the indoor heat exchanger of the air conditioner is defrosted, the second control strategy corresponding to the preset interval in which the difference is located is used to control the air conditioner, and the ventilation stage is entered when the second preset condition is met. When the ventilation duration is equal to the preset ventilation duration, the self-cleaning mode is exited. According to the difference between the indoor temperature and the indoor set temperature, the air conditioner is controlled before frosting, and the air conditioner is also controlled according to the difference when defrosting, so as to minimize the influence on the indoor temperature during frosting and defrosting, and improve the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0059] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

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

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

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

[0063] Figure 4 is an air conditioner indoor heat exchanger self-cleaning control device structure schematic diagram provided by the embodiment of the application;

[0064] Figure 5 is an air conditioner indoor heat exchanger self-cleaning control system structure schematic diagram provided by the embodiment of the 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 will be described in detail below with reference to the drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of the present application.

[0066] With reference to Figure 1 , the embodiment of the present application provides an air conditioner indoor heat exchanger self-cleaning control method, comprising:

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

[0068] Wherein, entering the self-cleaning mode can be in response to the user's instruction, or it can be the condition of triggering the self-cleaning mode of the indoor unit heat exchanger after detecting the corresponding parameters. The present application does not limit this.

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

[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 needs to be cooled, so the compressor frequency is controlled to increase before frosting, increasing the air conditioning refrigeration capacity and accelerating the indoor temperature reduction. It can be understood that when the compressor frequency is increased, the upper limit must not exceed the maximum allowed value. If it is reached, the highest allowed value is maintained.

[0071] If the difference is less than or equal to the fourth preset difference and greater than or equal to a fifth preset difference within a fourth preset time period during which the first control strategy is used to control the air conditioner, it is determined that the first preset condition is met, and the indoor heat exchanger of the air conditioner is immediately controlled to frost. That is, after the compressor frequency is increased, the difference reaches the target temperature range, so the air conditioner can directly enter the frosting stage, and the influence on the indoor temperature is small.

[0072] If the difference is always greater than the fourth preset difference within the fourth preset time period, it is determined that the first preset condition is met after the fourth preset time period, and the indoor heat exchanger of the air conditioner is controlled to frost. 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. If the air conditioner continues to operate according to this scheme, self-cleaning cannot be performed. Therefore, the fourth preset time period is set to ensure that the air conditioner can frost.

[0073] It can be understood that when the difference is in other intervals, the air conditioner can be directly controlled to frost or controlled 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 in the target temperature range, so the compressor frequency does not need to be changed.

[0075] If the time period during which the current compressor frequency is maintained is equal to a fifth preset time period, it is determined that the first preset condition is met, and the indoor heat exchanger of the air conditioner is controlled to frost. The fifth preset time period is set to ensure that the air conditioner can enter the frosting stage.

[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 angle of the fan blade to the minimum. At this time, the indoor temperature is less than the indoor set temperature, and the indoor temperature needs to be increased. However, because the air conditioner needs to frost, the air conditioner needs to cool, and the heat exchange between the indoor heat exchanger and the indoor air needs to be reduced, that is, the frequency of the indoor fan needs to be reduced, and the angle of the fan blade needs to be adjusted to the minimum to avoid cold air blowing.

[0077] If the difference is less than or equal to the first preset difference and greater than or equal to a second preset difference within a sixth preset time period during which the first control strategy is used to control the air conditioner, it is determined that the first preset condition is met, and the indoor heat exchanger of the air conditioner is immediately controlled to frost. If the difference is always less than the fifth preset difference within the sixth preset time period, it is determined that the first preset condition is met after the sixth preset time period, and the indoor heat exchanger of the air conditioner is controlled to frost.

[0078] As a preferred implementation manner of the embodiment of the present application, the method further comprises:

[0079] When the frosting of the indoor heat exchanger of the air conditioner is controlled, the coil temperature of the indoor heat exchanger is obtained;

[0080] When the coil temperature is greater than a preset coil temperature, the coil temperature is reduced in at least one of the following manners:

[0081] The operating frequency of the compressor can be increased;

[0082] The rotating speed of the indoor fan can be reduced; and / or

[0083] The opening degree of the electronic expansion valve can be reduced.

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

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

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

[0087] In another embodiment, the preset frosting duration is determined according to actual parameters. For example, the preset frosting duration is determined based on the difference, the actual indoor humidity, the accumulated duration after the last cleaning, and the accumulated operating duration after the last cleaning.

[0088] The actual indoor humidity, the accumulated duration after the last cleaning, and the accumulated operating duration after the last cleaning are obtained.

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

[0090] The preset frosting duration = preset reference value + first correction coefficient * difference + second correction coefficient * (actual indoor humidity - reference humidity) + third correction coefficient * (accumulated duration - accumulated operating duration) + fourth correction coefficient * accumulated operating duration.

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

[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. For example, the preset frosting temperature is determined based on the difference, and the greater the difference, the greater the frosting temperature.

[0094] It should be noted that the defrosting of the embodiments of the present application is directly followed by ventilation, and then the self-cleaning mode is exited. The defrosting and ventilation stages are not improved.

[0095] As shown in Figure 2 Another self-cleaning control method of an indoor heat exchanger of an air conditioner is provided in the embodiments of the present application, and the method comprises the following steps:

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

[0097] S22: The air conditioner is controlled by using the first control strategy corresponding to the preset interval in which the difference is located, and the indoor heat exchanger of the air conditioner is controlled to frost when the first preset condition is met.

[0098] S23: 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 using the second control strategy corresponding to the preset interval in which the difference is located;

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

[0100] The repeated parts and Figure 1 the embodiments provided in the above embodiments, which will not be described herein again.

[0101] The difference between the embodiments shown in Figure 1 is that further control is performed based on the difference in the defrosting stage, so that the defrosting stage can also avoid the influence of defrosting on the indoor temperature, and the user experience is improved.

[0102] The air conditioner is controlled by using the second control strategy corresponding to the preset interval in which the difference is located, and the ventilation stage is entered when the second preset condition is met, and the method comprises the following steps:

[0103] When the difference is greater than a first preset difference, the corresponding second control strategy comprises stopping the indoor fan and simultaneously adjusting the angle of the fan blade to decrease;

[0104] If the difference is less than or equal to the first preset difference and greater than or equal to a second preset difference within a first preset time length during which the air conditioner is controlled by using the second control strategy, it is judged that the second preset condition is met, and the ventilation stage is immediately entered; if the difference is always greater than the first preset difference within the first preset time length, it is judged that the second preset condition is met after the first preset time length, 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, direct defrosting can be not controlled or controlled according to the preferred scheme provided in the following embodiments.

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

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

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

[0109] If the difference is less than or equal to the first preset difference and greater than or equal to the second preset difference within a third preset duration of controlling the air conditioner by using the second control strategy, it is judged that the second preset condition is met, and the ventilation phase is immediately entered. If the difference is always less than the second preset difference within the third preset duration, it is judged that the second preset condition is met after the third preset duration, and the ventilation phase is entered.

[0110] In addition, when the difference is less than or equal to a third preset difference, the corresponding second control strategy further includes starting an 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 started. Or, when the difference is less than the second preset difference and greater than the third preset difference, only the compressor frequency is increased, and the indoor fan is not started.

[0111] The air conditioner indoor heat exchanger self-cleaning control method provided in the embodiments of the present application acquires the indoor temperature in real time after the air conditioner enters the self-cleaning mode of the indoor heat exchanger, calculates the difference between the indoor temperature and the indoor set temperature, controls the air conditioner by using the first control strategy corresponding to the preset interval in which the difference is located, and controls the air conditioner indoor heat exchanger to frost when the first preset condition is met. Defrosting is performed on the air conditioner indoor heat exchanger when the defrosting condition is triggered. The second control strategy corresponding to the preset interval in which the difference is located is used to control the air conditioner when defrosting is performed on the air conditioner indoor heat exchanger, and the ventilation phase is entered when the second preset condition is met. The self-cleaning mode is exited when the ventilation duration is equal to the preset ventilation duration. The air conditioner is controlled according to the difference between the indoor temperature and the indoor set temperature before frosting, and the air conditioner is also controlled according to the difference when defrosting, so that the indoor temperature is not affected as much as possible when frosting and defrosting, and the user experience is improved.

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

[0113] 1) In response to the air conditioner self-cleaning instruction, the user required inner loop control parameters are received, and the inner loop control parameters include the inner loop target temperature Tb.

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

[0115] 3) It can be understood that: ① When K is large, K>3℃, at this time, the difference between the inner loop T1 and Tb is large, the indoor temperature needs to be reduced to reach the user required temperature Tb, and the current running mode is the self-cleaning refrigeration frost formation mode, the current compressor frequency F is adjusted to rise at a speed of every 2Hz / 20S, F rises no more than the maximum frequency Fmax of the current air conditioner running, and the fan blade performs wind sweeping, which can make the inner loop T1 drop in a certain time. If K does not drop to the target range temperature -3℃≤K≤3℃ within 180S, the next step is entered. The advantage of controlling K in the target range is that the environment temperature is close to the user set temperature, so that the self-cleaning process also participates in the control of the environment temperature, and effective heating or cooling is realized when the difference between the user set temperature and the actual ring temperature is too large.

[0116] ② If K<-3℃, at this time, the inner loop T1 is smaller than Tb, the indoor temperature needs to be raised to reach the user required temperature, the current is the self-cleaning frost formation mode, in order not to increase the indoor cold 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 supply can not be directed to the human activity area, the reduced speed can ensure that the defrosting time is shortened and the frost formation efficiency is improved. If K does not drop to the target range temperature -3℃≤K≤3℃ within 120S, the next step is entered.

[0117] ③ If the range of K drops to the interval range of -3℃≤K≤3℃, the current frequency speed is maintained, if it can be maintained for 90S, the indoor heat exchange capacity at this time can be maintained in a relatively stable state, and then the refrigeration frost formation pipe temperature control stage is entered.

[0118] 4) Current frost control is in progress, the fan blade angle needs to be adjusted to the minimum to ensure that the cold air is not excessively discharged to the room. Obtain the first refrigeration frosting duration t1, which is related to K, indoor humidity φ%, cumulative running duration C, and the last self-cleaning cumulative duration X. The longer the cumulative running duration C, the more indoor dirt, the longer the required t1, in direct proportion. Similarly, the longer the interval duration X from the last self-cleaning to this self-cleaning, the longer the required t1. C is within X. The higher the indoor humidity φ%, the higher the dew point temperature, the more condensate water generated under the same conditions of indoor heat exchanger air, the better the frosting effect, and the shorter the duration. t1 is also related to K, the larger K, the longer the duration required, which can ensure that the indoor temperature T1 is reduced in a certain time, the smaller K, the smaller the duration of frosting, avoiding excessive cold output to the room. Therefore, the first refrigeration frosting duration t1=t0+Z1*K-Z2*(φ%-β%)+Z3*(X-C)+Z4*C (related formula). Wherein, β% is the reference value of indoor relative humidity, t0 is the reference value of the first refrigeration frosting duration, and Z1, Z2, Z3, Z4 are correction coefficients.

[0119] 5) The refrigeration frosting requires the inner tube temperature to reach a target temperature to ensure that the indoor heat exchanger is frosted and the frost is combined with dirt and other dirt. It can be understood that when the air conditioner is in the refrigeration defrosting stage, the indoor coil temperature is inversely proportional to 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 degree 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 degree of the electronic expansion valve can be reduced to reduce the indoor coil temperature; when the inner tube temperature decreases to the first refrigeration frosting target temperature T2, wherein T2 can be T2=Tb+Z5*K-D by the formula. It needs to be noted that the refrigeration frosting target temperature T2 in the above formula is not a fixed value, but a value range.

[0120] 6) Identify that the air conditioner is in the refrigeration frosting stage, the duration reaches the first refrigeration frosting duration t1, and / or the inner tube temperature of the air conditioner decreases to the first refrigeration frosting inner tube temperature target temperature T2, then end the refrigeration frosting inner loop control stage.

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

[0122] 8) entering a ventilation phase, reaching a ventilation preset second time length t2, and then exiting the self-cleaning mode.

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

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

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

[0126] The control of the air conditioner by using the first control strategy corresponding to the preset interval in which the difference is located, and the control of the air conditioner indoor heat exchanger to frost when the first preset condition is met, comprises:

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

[0128] If the difference is less than or equal to the fourth preset difference and greater than or equal to a fifth preset difference within a fourth preset time length during which the air conditioner is controlled by using the first control strategy, it is determined that the first preset condition is met, and the air conditioner indoor heat exchanger is immediately controlled to frost. If the difference is always greater than the fourth preset difference within the fourth preset time length, it is determined that the first preset condition is met after the fourth preset time length, and the air conditioner indoor heat exchanger is controlled to 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 comprises maintaining the current compressor frequency.

[0130] If the time length of maintaining the current compressor frequency is equal to a fifth preset time length, 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 comprises reducing the indoor fan frequency at a third preset rate and adjusting the fan blade to the minimum angle.

[0132] If the difference is less than or equal to the first preset difference and greater than or equal to a second preset difference within a sixth preset time period during which the first control strategy is used to control the air conditioner, it is determined that the first preset condition is met, and the indoor heat exchanger of the air conditioner is immediately controlled to defrost; if the difference is always less than the fifth preset difference within the sixth preset time period, it is determined that the first preset condition is met after the sixth preset time period, and the indoor heat exchanger of the air conditioner is controlled to defrost.

[0133] The air conditioner defrosting control module 43 is configured to defrost the indoor heat exchanger of the air conditioner when a defrosting condition is triggered, and to control the air conditioner by using a second control strategy corresponding to the preset interval in which the difference is located when the indoor heat exchanger of the air conditioner is defrosting.

[0134] The second control strategy corresponding to the preset interval in which the difference is located is used to control the air conditioner, and when a second preset condition is met, the air conditioner enters a ventilation stage, including:

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

[0136] If the difference is less than or equal to the first preset difference and greater than or equal to a second preset difference within a first preset time period during which the second control strategy is used to control the air conditioner, it is determined that the second preset condition is met, and the air conditioner immediately enters the ventilation stage; if the difference is always greater than the first preset difference within the first preset time period, it is determined that the second preset condition is met after the first preset time period, and the air conditioner enters the ventilation stage.

[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 time period during which the current compressor frequency is maintained is equal to a second preset time period, it is determined that the second preset condition is met, and the air conditioner enters the ventilation stage.

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

[0140] If the difference is less than or equal to the first preset difference and greater than or equal to the second preset difference within a third preset time period during which the second control strategy is used to control the air conditioner, it is determined that the second preset condition is met, and the air conditioner immediately enters the ventilation stage; if the difference is always less than the second preset difference within the third preset time period, it is determined that the second preset condition is met after the third preset time period, and the air conditioner enters the ventilation stage.

[0141] Further, when the difference is less than or equal to a third preset difference, the corresponding second control strategy further comprises starting the indoor fan, and the third preset difference is less than the second preset difference.

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

[0143] Preferably, the indoor actual humidity, the accumulated duration after the last cleaning, and the accumulated running duration after the last cleaning are obtained.

[0144] Based on the difference, the indoor actual humidity, the accumulated duration, and the accumulated running duration, a preset frosting duration is calculated, and the calculation formula is as follows:

[0145] The preset frosting duration = preset reference value + first correction coefficient * difference + second correction coefficient * (indoor actual humidity - reference humidity) + third correction coefficient * (accumulated duration - accumulated running duration) + fourth correction coefficient * accumulated running duration.

[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 greater the difference, the greater the frosting temperature.

[0147] The cleaning mode exit module 44 is configured to enter the ventilation phase when the second preset condition is met, and exit the self-cleaning mode when the ventilation duration is equal to a preset ventilation duration.

[0148] The air conditioner indoor heat exchanger self-cleaning control device provided by the embodiments of the present application obtains the indoor temperature in real time after the air conditioner enters the self-cleaning mode of the indoor heat exchanger, calculates the difference between the indoor temperature and the indoor set temperature, controls the air conditioner by using the first control strategy corresponding to the preset interval in which the difference is located, and controls 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 second control strategy corresponding to the preset interval in which the difference is located is used to control the air conditioner, and the ventilation phase is entered when the second preset condition is met. The self-cleaning mode is exited when the ventilation duration is equal to a preset ventilation duration. The present application controls the air conditioner according to the difference between the indoor temperature and the indoor set temperature before frosting, and controls the air conditioner according to the difference during defrosting, so as to minimize the influence on the indoor temperature during frosting and defrosting, and improve the user experience.

[0149] Based on the same inventive concept, as shown in Figure 5 The present application further provides an air conditioner indoor heat exchanger self-cleaning control system 50, which comprises:

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

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

[0152] The processor is configured to execute the air conditioner indoor heat exchanger self-cleaning control method provided by the above-mentioned embodiments.

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

[0154] Based on the same inventive concept, the present application also provides an air conditioner applying the air conditioner indoor heat exchanger self-cleaning control method provided by the above-mentioned embodiments.

[0155] The air conditioner provided by the embodiments of the present application applies the air conditioner indoor heat exchanger self-cleaning control method provided by the above-mentioned embodiments. After the air conditioner enters the self-cleaning mode of the indoor heat exchanger, the indoor temperature can be acquired in real time, the difference between the indoor temperature and the indoor set temperature is calculated, the air conditioner is controlled by using the first control strategy corresponding to the preset interval in which the difference is located, and the air conditioner indoor heat exchanger is controlled 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 by using the second control strategy corresponding to the preset interval in which the difference is located, and enters the ventilation stage when the second preset condition is met. When the ventilation duration is equal to the preset ventilation duration, the self-cleaning mode is exited. According to the difference between the indoor temperature and the indoor set temperature before frosting, the air conditioner is controlled in the present application scheme, and the air conditioner is also controlled according to the difference when defrosting, so that the indoor temperature is not affected as much as possible when frosting and defrosting, and the user experience is improved.

[0156] It should be noted that in the description of the present 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 the present application, the meaning of "a plurality of" is at least two, unless otherwise specified.

[0157] It can be understood that the same or similar parts in the above embodiments can be mutually referred to, and the contents not described in detail in some embodiments can be referred 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 in which 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; When a defrost condition is triggered, defrosting the indoor heat exchanger of the air conditioner; Among them, when the frosting time is greater than or equal to the preset frosting time, the defrosting condition is triggered; It also includes: obtaining the actual indoor humidity, the cumulative time since the last cleaning, and the cumulative power-on running time since the last cleaning; the preset frost time = preset reference value + first correction coefficient * difference + second correction coefficient * (actual indoor humidity - reference humidity) + third correction coefficient * (cumulative time - cumulative power-on running time) + fourth correction coefficient * cumulative power-on running time.

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 entering the ventilation stage when a 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, wherein: The air conditioner is controlled by adopting a second control strategy corresponding to a preset interval where the difference value is located, and entering a ventilation stage 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, wherein: The air conditioner is controlled by adopting a second control strategy corresponding to a preset interval where the difference value is located, and entering a ventilation stage 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, wherein: The air conditioner is controlled by adopting a second control strategy corresponding to a preset interval where the difference value is located, and entering a ventilation stage 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, wherein: The method of controlling the air conditioner by adopting a first control strategy corresponding to a preset interval in which 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 air conditioner is controlled by 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 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, wherein: The method of controlling the air conditioner by adopting a first control strategy corresponding to a preset interval in which 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, wherein: The method of controlling the air conditioner by adopting a first control strategy corresponding to a preset interval in which 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 a fifth preset difference, the corresponding first control strategy includes reducing the frequency of the indoor unit fan at a third preset rate and adjusting the fan blades to a minimum angle; If, within the sixth preset time period when the air conditioner is controlled by 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 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 frost.

10. The method according to claim 1, characterized in that Also includes: The preset frosting temperature is determined based on the difference, and the greater the difference, the greater the frosting temperature.

11. The method according to claim 1, wherein Also includes: When controlling frost formation on 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.

12. A self-cleaning control device for an indoor heat exchanger of an air conditioner, characterized in that: include: A temperature difference acquisition module is used to 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; an air conditioner frost control module, configured to control the air conditioner using a first control strategy corresponding to a preset interval within which the difference lies, and to control frost formation on the indoor heat exchanger of the air conditioner when a first preset condition is met; An air conditioner defrost control module, configured to defrost the air conditioner indoor heat exchanger when a defrost condition is triggered; Among them, when the frosting time is greater than or equal to the preset frosting time, the defrosting condition is triggered; It also includes: obtaining the actual indoor humidity, the cumulative time since the last cleaning, and the cumulative power-on running time since the last cleaning; the preset frost time = preset reference value + first correction coefficient * difference + second correction coefficient * (actual indoor humidity - reference humidity) + third correction coefficient * (cumulative time - cumulative power-on running time) + fourth correction coefficient * cumulative power-on running time.

13. 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 to 11.

14. An air conditioner, characterized in that: The method according to any one of claims 1 to 11 is used.

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