Defrosting control method and device of air conditioner and air conditioner

Abstract

The application relates to the air conditioning technical field, and provides a defrosting control method and device of an air conditioner and the air conditioner. The defrosting control method of the air conditioner comprises the following steps: in the case that the air conditioner meets a defrosting preset condition, detecting a real-time current value of an outdoor fan of the air conditioner; according to the real-time current value of the outdoor fan, obtaining a frosting degree evaluation coefficient of the air conditioner; determining that the frosting degree evaluation coefficient meets a first preset condition, and controlling the air conditioner to execute a defrosting strategy; wherein the frosting degree evaluation coefficient comprises a first evaluation coefficient, and the first evaluation coefficient is a ratio of the real-time current value of the outdoor fan to a complete frosting preset current value of an outdoor heat exchanger of the air conditioner. The application can improve the accuracy of the defrosting control of the air conditioner, avoid frequent defrosting and false defrosting, and thus guarantee the heating effect of the air conditioner.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a defrosting control method, device and air conditioner for an air conditioner. Background Technology

[0002] In low-temperature winter environments, due to the heat demand on the indoor side, the outdoor heat exchanger often enters a frosty state. The frost layer reduces the heat exchange efficiency of the outdoor unit, increases energy consumption, and reduces the heating effect of the indoor unit.

[0003] Currently, the most widely used defrosting method is to switch the four-way reversing valve to defrost when the outdoor ambient temperature reaches the set temperature. During the reversing process, the indoor unit is turned off. This causes indoor temperature fluctuations when entering defrosting mode, reducing indoor comfort. Furthermore, due to the complexity of the outdoor environment, the air conditioner is prone to entering false defrosting mode. Frequent entry into defrosting control or false defrosting mode will reduce the heating effect of the air conditioner. Summary of the Invention

[0004] This invention provides a defrosting control method, device, and air conditioner for an air conditioner, which can improve the accuracy of defrosting control, avoid frequent defrosting and accidental defrosting, thereby ensuring the heating effect of the air conditioner.

[0005] This invention provides a defrosting control method for an air conditioner, comprising:

[0006] When the air conditioner meets the preset defrosting conditions, the real-time current value of the outdoor fan of the air conditioner is detected.

[0007] The frosting degree evaluation coefficient of the air conditioner is obtained based on the real-time current value of the outdoor fan.

[0008] If the frost level evaluation coefficient is determined to meet the first preset condition, the air conditioner is controlled to execute a defrosting strategy.

[0009] The frost degree evaluation coefficient includes a first evaluation coefficient, which is the ratio of the real-time current value of the outdoor fan to the preset current value for complete frost formation of the outdoor heat exchanger of the air conditioner.

[0010] According to the defrosting control method for an air conditioner provided by the present invention, the step of determining that the frost degree evaluation coefficient meets a first preset condition specifically includes:

[0011] The real-time current value of the outdoor fan is detected once every first preset time interval, and the first evaluation coefficient corresponding to the real-time current value is continuously obtained multiple times.

[0012] If the current first evaluation coefficient is greater than or equal to 1, and the ratio of the previous N first evaluation coefficients to the current first evaluation coefficient reaches the first target preset value, it is determined that the frost degree evaluation coefficient meets the first preset condition.

[0013] Where N is an integer greater than or equal to 1.

[0014] According to the defrosting control method for an air conditioner provided by the present invention, the step of controlling the air conditioner to execute a defrosting strategy specifically includes:

[0015] After the air conditioner enters the defrost state, the operating status of the indoor unit and the outdoor ambient temperature are obtained.

[0016] When the indoor unit is in operation, if the outdoor ambient temperature is determined to be greater than or equal to a first preset temperature, the fan of the indoor unit is turned off and the electric auxiliary heater of the indoor unit is turned on.

[0017] If the outdoor ambient temperature is determined to be lower than the first preset temperature, the fan of the indoor unit is controlled to run in low fan mode, and the electric auxiliary heating of the indoor unit is turned on.

[0018] According to a defrosting control method for an air conditioner provided by the present invention, the step of controlling the air conditioner to execute a defrosting strategy further includes:

[0019] When the indoor unit is in standby mode, if the outdoor ambient temperature is determined to be greater than or equal to the first preset temperature, the fan and electric auxiliary heater of the indoor unit are controlled to be turned off.

[0020] If the outdoor ambient temperature is determined to be lower than the first preset temperature, the fan of the indoor unit is turned off, and the electric auxiliary heater of the indoor unit is turned on.

[0021] According to a defrosting control method for an air conditioner provided by the present invention, the step of controlling the air conditioner to execute a defrosting strategy further includes:

[0022] After the air conditioner enters the defrost state, the high pressure of the refrigerant during the operation of the air conditioner is obtained.

[0023] The compressor frequency of the air conditioner is controlled according to the refrigerant high pressure.

[0024] According to the present invention, a defrosting control method for an air conditioner, wherein the steps for the air conditioner to meet preset defrosting conditions specifically include:

[0025] The coil temperature of the outdoor heat exchanger, the outdoor ambient temperature, and the outdoor relative humidity are obtained.

[0026] The defrosting preset temperature is determined based on the outdoor ambient temperature and the outdoor ambient relative humidity.

[0027] If the coil temperature of the outdoor heat exchanger is determined to be lower than the preset defrost temperature, the air conditioner meets the preset defrost conditions.

[0028] According to the defrosting control method for an air conditioner provided by the present invention, the step of determining a preset defrosting temperature based on the outdoor ambient temperature and the outdoor ambient relative humidity specifically includes:

[0029] When the outdoor ambient temperature is greater than or equal to zero and less than the second preset temperature, and the outdoor ambient relative humidity is greater than the set humidity, the defrost preset temperature is determined to be less than or equal to the first set value.

[0030] When the outdoor ambient temperature is greater than or equal to zero and less than the second preset temperature, and the outdoor ambient relative humidity is less than or equal to the set humidity, the defrosting preset temperature is determined to be less than or equal to the second set value.

[0031] Wherein, the first set value is greater than the second set value.

[0032] According to a defrosting control method for an air conditioner provided by the present invention, the step of determining a preset defrosting temperature based on the outdoor ambient temperature and the outdoor ambient relative humidity further includes:

[0033] When the outdoor ambient temperature is greater than or equal to the second preset temperature, the defrosting preset temperature is determined to be less than or equal to the second set value.

[0034] According to a defrosting control method for an air conditioner provided by the present invention, the step of determining a preset defrosting temperature based on the outdoor ambient temperature and the outdoor ambient relative humidity further includes:

[0035] When the outdoor ambient temperature is greater than or equal to the third preset temperature and less than zero, and the outdoor ambient relative humidity is greater than the set humidity, it is determined that the difference between the defrost preset temperature and the outdoor ambient temperature is less than or equal to the first set value.

[0036] When the outdoor ambient temperature is greater than or equal to the third preset temperature and less than zero, and the outdoor ambient relative humidity is less than or equal to the set humidity, the difference between the defrost preset temperature and the outdoor ambient temperature is determined to be less than or equal to the second set value.

[0037] According to a defrosting control method for an air conditioner provided by the present invention, the step of determining a preset defrosting temperature based on the outdoor ambient temperature and the outdoor ambient relative humidity further includes:

[0038] When the outdoor ambient temperature is lower than the third preset temperature, it is determined that the difference between the defrosting preset temperature and the outdoor ambient temperature is less than or equal to the second set value, or it is determined that the defrosting preset temperature is less than or equal to the third set value.

[0039] The third setting value is less than the second setting value.

[0040] According to a defrosting control method for an air conditioner provided by the present invention, the defrosting control method further includes:

[0041] When the air conditioner meets the preset conditions for exiting defrost, the real-time current value of the outdoor fan of the air conditioner is detected.

[0042] The frosting degree evaluation coefficient of the air conditioner is obtained based on the real-time current value of the outdoor fan.

[0043] If the frost level evaluation coefficient is determined to meet the second preset condition, the air conditioner is controlled to exit defrost mode.

[0044] The frost level evaluation coefficient also includes a second evaluation coefficient, which is the ratio of the preset current value of the outdoor heat exchanger of the air conditioner to the real-time current value of the outdoor fan.

[0045] According to the defrosting control method for an air conditioner provided by the present invention, the step of determining that the frost degree evaluation coefficient meets a second preset condition specifically includes:

[0046] The real-time current value of the outdoor fan is detected every second preset time interval, and the second evaluation coefficient corresponding to the real-time current value is continuously obtained multiple times.

[0047] If the second evaluation coefficient is greater than or equal to the second target preset value in multiple consecutive tests, it is determined that the frost degree evaluation coefficient meets the second preset condition.

[0048] According to the present invention, a defrosting control method for an air conditioner, wherein the step of satisfying the preset conditions for exiting defrosting specifically includes:

[0049] Obtain the coil temperature of the outdoor unit;

[0050] If the coil temperature of the outdoor unit is determined to be greater than or equal to the fourth preset temperature, the air conditioner meets the preset conditions for exiting defrosting.

[0051] The present invention also provides a defrosting control device for an air conditioner, comprising:

[0052] The detection module is used to detect the real-time current value of the outdoor fan of the air conditioner when the air conditioner meets the preset defrosting conditions.

[0053] The acquisition module is used to acquire the frosting degree evaluation coefficient of the air conditioner based on the real-time current value of the outdoor fan;

[0054] The control module is used to determine whether the frost degree evaluation coefficient meets the first preset condition, and to control the air conditioner to execute the defrosting strategy.

[0055] The frost degree evaluation coefficient includes a first evaluation coefficient, which is the ratio of the real-time current value of the outdoor fan to the preset current value for complete frost formation of the outdoor heat exchanger of the air conditioner.

[0056] The present invention also provides an air conditioner, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the defrosting control method of the air conditioner described above.

[0057] The defrosting control method, apparatus, and air conditioner provided by this invention, when the air conditioner meets the preset defrosting conditions, further detects the real-time current value of the outdoor fan of the air conditioner, and obtains a frost degree evaluation coefficient based on the real-time current value. When the frost degree evaluation coefficient meets a first preset condition, the air conditioner is controlled to execute a defrosting strategy. Therefore, by combining the preset defrosting conditions and the frost degree evaluation coefficient, this invention can effectively avoid the air conditioner from entering false defrosting control due to excessively low temperatures, improve the accuracy of defrosting control, avoid frequent defrosting, and thus ensure the heating effect of the air conditioner. Attached Figure Description

[0058] To more clearly illustrate the technical solutions in this invention or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0059] Figure 1 This is one of the flowcharts illustrating the defrosting control method for an air conditioner provided by the present invention;

[0060] Figure 2 This is the second flowchart illustrating the defrosting control method for an air conditioner provided by the present invention;

[0061] Figure 3 This is the third flowchart illustrating the defrosting control method for an air conditioner provided by the present invention;

[0062] Figure 4 This is the fourth flowchart illustrating the defrosting control method for an air conditioner provided by the present invention;

[0063] Figure 5 This is a schematic diagram of the defrosting control device for an air conditioner provided by the present invention;

[0064] Figure 6This is a schematic diagram of the structure of the air conditioner provided by the present invention.

[0065] Figure label:

[0066] 510: Detection module; 520: Acquisition module; 530: Control module;

[0067] 610: Processor; 620: Communication interface;

[0068] 630: Memory; 640: Communication bus. Detailed Implementation

[0069] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0070] In the description of the embodiments of the present invention, it should be noted that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0071] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0072] The following is combined Figures 1-6 The present invention describes a defrosting control method, apparatus, and air conditioner for an air conditioner.

[0073] According to an embodiment of the first aspect of the present invention, referring to Figure 1 As shown, the present invention provides a defrosting control method for an air conditioner, which mainly includes the following steps:

[0074] S100. When the air conditioner meets the preset defrosting conditions, detect the real-time current value of the outdoor fan of the air conditioner.

[0075] S200. Obtain the frost level evaluation coefficient of the air conditioner based on the real-time current value of the outdoor fan.

[0076] S300: Determine that the frost level evaluation coefficient meets the first preset condition, and control the air conditioner to execute the defrosting strategy.

[0077] The frost level evaluation coefficient includes a first evaluation coefficient, which is the ratio of the real-time current value of the outdoor fan to the preset current value for complete frost formation of the outdoor heat exchanger of the air conditioner.

[0078] The defrosting control method for air conditioners provided in this embodiment of the invention further detects the real-time current value of the outdoor fan of the air conditioner when the air conditioner meets the preset defrosting conditions, and obtains the frost degree evaluation coefficient of the air conditioner based on the real-time current value. When the frost degree evaluation coefficient meets the first preset condition, it indicates that the outdoor heat exchanger of the air conditioner is severely frosted, and at this time the air conditioner is controlled to execute the defrosting strategy to defrost.

[0079] Therefore, by combining the defrosting preset conditions and the frost degree evaluation coefficient, the present invention can effectively avoid the air conditioner from entering false defrosting control due to excessively low temperature, improve the accuracy of the air conditioner's defrosting control, avoid frequent defrosting, and thus ensure the heating effect of the air conditioner.

[0080] According to one embodiment of the present invention, referring to Figure 2 As shown, the steps for determining whether the frosting degree evaluation coefficient meets the first preset condition specifically include:

[0081] S301. Detect the real-time current value of the outdoor fan once every first preset time interval, and continuously obtain the first evaluation coefficient corresponding to multiple real-time current values.

[0082] S302. If the current first evaluation coefficient is greater than or equal to 1, and the ratio of the first evaluation coefficient in the previous N times to the current first evaluation coefficient reaches the first target preset value, it is determined that the frost degree evaluation coefficient meets the first preset condition; where N is an integer greater than or equal to 1.

[0083] Specifically, considering that the wind resistance of the outdoor fan increases when the outdoor heat exchanger frosts, resulting in a corresponding increase in the current of the outdoor fan, this embodiment of the invention can further evaluate the degree of frost on the outdoor heat exchanger by real-time detection of the current of the outdoor fan under the condition of meeting the defrosting preset conditions.

[0084] η = I k / I1;

[0085] Where η is the first evaluation coefficient, the larger η is, the greater the degree of frosting; I kI1 is the real-time current value of the outdoor fan during the kth test; I2 is the preset current value for complete frosting of the outdoor heat exchanger.

[0086] For example, the real-time current value of the outdoor fan is measured every 10 seconds, for a total of three measurements. The resulting first evaluation coefficients are: η k η k-1 η k-2 Then if and only if η k ≥1, and η k-1 With η k and η k-2 With η k When the ratio of the two values ​​is 0.9 to 1, it indicates that the frosting is severe, and at this time it is determined that the first preset condition corresponding to the current is met.

[0087] This invention uses an evaluation coefficient corresponding to continuous current values ​​to determine whether false defrosting control is triggered due to an excessively high current value, thereby effectively improving the accuracy of defrosting control.

[0088] According to an embodiment of the present invention, the step of controlling the air conditioner to perform a defrosting strategy specifically includes the step of controlling the indoor unit of the air conditioner: when the first evaluation coefficient of the frost degree evaluation coefficient meets the first preset condition, after the air conditioner enters the defrosting state, the operating status of the indoor unit of the air conditioner and the outdoor ambient temperature are obtained; when the indoor unit is in the operating state, if it is determined that the outdoor ambient temperature is greater than or equal to the first preset temperature, the fan of the indoor unit is controlled to be turned off and the electric auxiliary heating of the indoor unit is turned on; if it is determined that the outdoor ambient temperature is less than the first preset temperature, the fan of the indoor unit is controlled to run to the low fan mode, i.e., the low speed setting, and the electric auxiliary heating of the indoor unit is turned on.

[0089] The defrosting process of an air conditioner mainly includes: when the air conditioner is running in heating mode, the high-temperature refrigerant discharged from the compressor of the outdoor unit flows into the outdoor heat exchanger in reverse direction to heat up and defrost by switching the four-way reversing valve.

[0090] Furthermore, when the indoor unit is in standby mode, if the outdoor ambient temperature is greater than or equal to the first preset temperature, the indoor unit's fan and electric auxiliary heating will be turned off; if the outdoor ambient temperature is less than the first preset temperature, the indoor unit's fan will be turned off and the indoor unit's electric auxiliary heating will be turned on.

[0091] Specifically, since outdoor ambient temperature is a crucial factor affecting defrosting time, the indoor unit is controlled to shorten the defrosting process when the outdoor ambient temperature is low: when the indoor unit is running, if the outdoor ambient temperature is greater than or equal to the first preset temperature, the indoor unit fan is turned off and the electric auxiliary heating is turned on after entering defrosting mode to reduce the impact of defrosting on the indoor environment; if the outdoor ambient temperature is lower than the first preset temperature, the electric auxiliary heating is turned on after entering defrosting mode. Furthermore, since the outdoor defrosting temperature is relatively harsh, the indoor unit fan is adjusted to a low fan speed mode to achieve rapid defrosting. Although this may temporarily affect the indoor temperature, it can greatly improve defrosting efficiency and is generally beneficial to indoor heating.

[0092] When the indoor unit is in standby mode, the indoor unit fan is not allowed to be turned on. The electric auxiliary heating function of the standby indoor unit will be turned on only when the outdoor ambient temperature is lower than the first preset temperature, so as to shorten the defrosting time of the outdoor unit and achieve the purpose of rapid defrosting.

[0093] For example, the table below is a specific example of the defrosting strategy implemented by the indoor unit of an air conditioner according to the present invention.

[0094]

[0095] According to one embodiment of the present invention, the step of controlling the air conditioner to perform a defrosting strategy further includes the step of controlling the outdoor unit of the air conditioner: after the air conditioner enters defrosting mode, the high pressure of the refrigerant during the operation of the air conditioner is obtained; and the compressor frequency of the air conditioner is controlled according to the high pressure of the refrigerant.

[0096] Specifically, if the refrigerant high-pressure pressure is lower than the target preset high-pressure pressure, the compressor is controlled to operate at an increased frequency; if the refrigerant high-pressure pressure is higher than the target preset high-pressure pressure, the compressor is controlled to operate at a decreased frequency, so as to stabilize the refrigerant high-pressure pressure at the target high-pressure pressure, thereby quickly completing the defrosting process. The target preset high-pressure pressure is preferably 32 bar.

[0097] Therefore, by controlling the indoor and outdoor units during the defrosting process, the present invention can shorten the defrosting time and achieve the purpose of rapid defrosting.

[0098] According to one embodiment of the present invention, referring to Figure 3 As shown, the steps for an air conditioner to meet the preset defrosting conditions specifically include:

[0099] S101. Obtain the coil temperature of the outdoor heat exchanger, the outdoor ambient temperature, and the outdoor ambient relative humidity.

[0100] S102. Determine the preset defrost temperature based on the outdoor ambient temperature and relative humidity.

[0101] S103. Determine that the coil temperature of the outdoor heat exchanger is lower than the preset defrost temperature, and the air conditioner meets the preset defrost conditions.

[0102] Currently, most defrosting conditions are based on outdoor ambient temperature, without considering the impact of outdoor relative humidity on frost formation. In fact, outdoor relative humidity is an important factor affecting the frost formation rate. Often, under the same dry bulb temperature conditions, the higher the humidity, the more condensate is generated on the outdoor unit's heat exchanger, and the easier it is for frost to form.

[0103] Therefore, by fully considering the influence of outdoor ambient temperature and relative humidity on defrosting, and thereby determining the preset defrosting temperature, i.e. the temperature judgment value for entering defrosting, the embodiments of the present invention can further improve the accuracy of defrosting control.

[0104] According to an embodiment of the present invention, the step of determining the preset defrost temperature based on the outdoor ambient temperature and the outdoor ambient relative humidity specifically includes:

[0105] When the outdoor ambient temperature is greater than or equal to zero and less than the second preset temperature, and the outdoor ambient relative humidity is greater than the set humidity, the defrost preset temperature is determined to be less than or equal to the first preset value; when the outdoor ambient temperature is greater than or equal to zero and less than the second preset temperature, and the outdoor ambient relative humidity is less than or equal to the set humidity, the defrost preset temperature is determined to be less than or equal to the second preset value; wherein, the first preset value is greater than the second preset value.

[0106] Specifically, when the outdoor ambient temperature is greater than or equal to zero and less than the second preset temperature, the influence of humidity needs to be considered during this process. The preset defrost temperature is higher when humidity is higher than when humidity is lower, mainly because the defrost process takes longer in high-humidity environments, resulting in a longer period of heating stoppage for the indoor unit, which is detrimental to maintaining indoor temperature. Therefore, when the outdoor relative humidity is greater than the set humidity, the temperature threshold for entering defrost is less than or equal to the relatively higher first preset value; when the outdoor relative humidity is less than or equal to the set humidity, the temperature threshold for entering defrost is less than or equal to the relatively lower second preset value.

[0107] According to an embodiment of the present invention, the step of determining the defrosting preset temperature based on the outdoor ambient temperature and the outdoor ambient relative humidity further includes: when the outdoor ambient temperature is greater than or equal to a second preset temperature, determining that the defrosting preset temperature is less than or equal to a second set value.

[0108] When the outdoor ambient temperature is greater than or equal to the second preset temperature, the outdoor ambient temperature is high and frost is unlikely to form. Therefore, the influence of the outdoor relative humidity can be disregarded, and the temperature threshold for defrosting is less than or equal to the second preset value.

[0109] According to one embodiment of the present invention, the step of determining the defrosting preset temperature based on the outdoor ambient temperature and the outdoor ambient relative humidity further includes:

[0110] When the outdoor ambient temperature is greater than or equal to the third preset temperature and less than zero, and the outdoor ambient relative humidity is greater than the set humidity, the difference between the defrost preset temperature and the outdoor ambient temperature is determined to be less than or equal to the first set value.

[0111] When the outdoor ambient temperature is greater than or equal to the third preset temperature and less than zero, and the outdoor ambient relative humidity is less than or equal to the set humidity, the difference between the defrost preset temperature and the outdoor ambient temperature is determined to be less than or equal to the second set value.

[0112] When the outdoor ambient temperature is greater than or equal to the third preset temperature and less than zero, the influence of humidity needs to be considered during this process. The preset defrost temperature is higher when humidity is higher than when humidity is lower. This is mainly because the defrost process takes longer in high-humidity environments, resulting in a longer period of heating stoppage for the indoor unit, which is detrimental to maintaining indoor temperature. Therefore, when the outdoor relative humidity is greater than the set humidity, the difference between the temperature threshold for entering defrost and the outdoor ambient temperature is less than or equal to the first preset value; when the outdoor relative humidity is less than or equal to the set humidity, the difference is less than or equal to the second preset value.

[0113] According to an embodiment of the present invention, the step of determining the defrost preset temperature based on the outdoor ambient temperature and the outdoor ambient relative humidity further includes: when the outdoor ambient temperature is lower than a third preset temperature, determining that the difference between the defrost preset temperature and the outdoor ambient temperature is less than or equal to a second set value, or determining that the defrost preset temperature is less than or equal to a third set value; wherein the third set value is less than the second set value.

[0114] When the outdoor ambient temperature is lower than the third preset temperature, the relative humidity has a negligible impact on the defrosting process because the water vapor content in the air is already very low. Therefore, the influence of relative humidity is not considered. In particular, either of the two temperature conditions must be met to enter the defrosting process.

[0115] For example, the table below is a comparison table of a specific example of how the present invention determines the preset defrost temperature based on the outdoor ambient temperature and the outdoor ambient relative humidity.

[0116]

[0117] According to one embodiment of the present invention, referring to Figure 4 As shown, the defrosting control method for the air conditioner of the present invention further includes the following steps:

[0118] S400. When the air conditioner meets the preset conditions for exiting defrost, detect the real-time current value of the outdoor fan of the air conditioner.

[0119] Specifically, the coil temperature of the outdoor unit is obtained; when the coil temperature of the outdoor unit is greater than or equal to the fourth preset temperature, for example, greater than or equal to 15°C, the air conditioner can be considered to meet the preset conditions for exiting defrost.

[0120] S500: Obtain the frost level evaluation coefficient of the air conditioner based on the real-time current value of the outdoor fan.

[0121] S600: Determine if the frost level evaluation coefficient meets the second preset condition, and control the air conditioner to exit defrosting.

[0122] The frost level evaluation coefficient also includes a second evaluation coefficient, which is the ratio of the preset current value for a completely frost-free outdoor heat exchanger to the real-time current value of the outdoor fan. Furthermore, the process of the air conditioner exiting defrost mode mainly involves: switching the four-way reversing valve again to allow the high-temperature refrigerant discharged from the compressor to flow into the indoor heat exchanger, thus resuming heating.

[0123] Specifically, the real-time current value of the outdoor fan is detected every second preset time interval, and the second evaluation coefficient corresponding to multiple real-time current values ​​is continuously obtained; if the second evaluation coefficient detected multiple times is greater than or equal to the second target preset value, it is determined that the frost degree evaluation coefficient meets the second preset condition.

[0124] Once the outdoor unit's coil temperature meets the preset conditions for exiting defrost, the degree of frost buildup on the outdoor heat exchanger after defrosting needs to be re-evaluated, namely:

[0125] 3 = I0 / I k ;

[0126] Among them, 3 is the second evaluation coefficient; the larger the 3, the greater the degree of frost-free status; I k Ik is the real-time current value of the outdoor fan during the k-th test; I0 is the preset current value for a completely frost-free outdoor heat exchanger.

[0127] For example, the real-time current value of the outdoor fan is detected every 10 seconds for a total of three times. When the ratio 3 calculated for three consecutive times is greater than or equal to 0.9, it indicates that there is no frost on the surface of the outdoor heat exchanger, that is, complete defrosting has been achieved. At this time, it is determined that the second preset condition corresponding to the current is met, and then the defrosting is stopped.

[0128] It should be noted that, since water droplets may remain on the surface of the outdoor heat exchanger after defrosting, and considering the wind resistance generated by the water droplets, the determination value for this invention is set to 0.9.

[0129] This invention uses an evaluation coefficient corresponding to the continuous current value to determine whether defrosting should be stopped only after complete defrosting. This effectively ensures the defrosting effect, avoids frequent defrosting, and thus improves the accuracy of control.

[0130] Furthermore, considering that the operating current value generally varies depending on the outdoor fan's rotational speed, this invention allows for the preset current values ​​I0 for complete frost-free operation and I1 for complete frost formation of the outdoor heat exchanger at different fan speed settings. When the outdoor fan actually operates at different fan speeds and its current value is measured and calculated to evaluate the degree of frost formation, the corresponding preset current values ​​I0 and I1 can be retrieved. This design further improves the accuracy of defrosting control.

[0131] The defrosting control device for an air conditioner provided by the present invention is described below. The defrosting control device for an air conditioner described below can be referred to in correspondence with the defrosting control method for an air conditioner described above.

[0132] According to an embodiment of the second aspect of the present invention, referring to Figure 5 As shown, the present invention also provides a defrosting control device for an air conditioner, mainly comprising: a detection module 510, an acquisition module 520, and a control module 530. The detection module 510 is used to detect the real-time current value of the outdoor fan of the air conditioner when the air conditioner meets the preset defrosting conditions; the acquisition module 520 is used to acquire the frost degree evaluation coefficient of the air conditioner based on the real-time current value of the outdoor fan; the control module 530 is used to determine that the frost degree evaluation coefficient meets the first preset condition and control the air conditioner to execute the defrosting strategy; wherein the frost degree evaluation coefficient includes a first evaluation coefficient, which is the ratio of the real-time current value of the outdoor fan to the preset current value for complete frost formation of the outdoor heat exchanger of the air conditioner.

[0133] The defrosting control device for air conditioners provided in this embodiment of the invention combines defrosting preset conditions and frost degree evaluation coefficients to effectively prevent the air conditioner from entering false defrosting control due to excessively low temperatures, thereby improving the accuracy of defrosting control and avoiding frequent defrosting, thus ensuring the heating effect of the air conditioner.

[0134] According to an embodiment of the third aspect of the present invention, referring to Figure 6As shown, the present invention also provides an air conditioner, which may include: a processor 610, a communication interface 620, a memory 630, and a communication bus 640, wherein the processor 610, the communication interface 620, and the memory 630 communicate with each other through the communication bus 640. The processor 610 can call logical instructions in the memory 630 to execute a defrosting control method for the air conditioner. The method includes: when the air conditioner meets the defrosting preset conditions, detecting the real-time current value of the outdoor fan of the air conditioner; obtaining the frost degree evaluation coefficient of the air conditioner based on the real-time current value of the outdoor fan; determining that the frost degree evaluation coefficient meets the first preset condition, and controlling the air conditioner to execute a defrosting strategy; wherein the frost degree evaluation coefficient includes a first evaluation coefficient, which is the ratio of the real-time current value of the outdoor fan to the preset current value for complete frost of the outdoor heat exchanger of the air conditioner.

[0135] Furthermore, the logical instructions in the aforementioned memory 630 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0136] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the defrosting control method for an air conditioner provided by the above methods. The method includes: detecting the real-time current value of the outdoor fan of the air conditioner when the air conditioner meets the defrosting preset conditions; obtaining the frost degree evaluation coefficient of the air conditioner based on the real-time current value of the outdoor fan; determining that the frost degree evaluation coefficient meets the first preset condition, and controlling the air conditioner to execute a defrosting strategy; wherein the frost degree evaluation coefficient includes a first evaluation coefficient, which is the ratio of the real-time current value of the outdoor fan to the preset current value for complete frost of the outdoor heat exchanger of the air conditioner.

[0137] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a defrosting control method for an air conditioner provided by the above methods. The method includes: detecting the real-time current value of the outdoor fan of the air conditioner when the air conditioner meets a preset defrosting condition; obtaining a frosting degree evaluation coefficient of the air conditioner based on the real-time current value of the outdoor fan; determining that the frosting degree evaluation coefficient meets a first preset condition; and controlling the air conditioner to execute a defrosting strategy; wherein the frosting degree evaluation coefficient includes a first evaluation coefficient, which is the ratio of the real-time current value of the outdoor fan to the preset current value for complete frosting of the outdoor heat exchanger of the air conditioner.

[0138] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0139] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A defrosting control method of an air conditioner, characterized by, The method comprises the following steps: In the case that the air conditioner meets the defrosting preset condition, detecting the real-time current value of the outdoor fan of the air conditioner; According to the real-time current value of the outdoor fan, obtaining the frosting degree evaluation coefficient of the air conditioner; Determining that the frosting degree evaluation coefficient meets the first preset condition, and controlling the air conditioner to execute the defrosting strategy; The frosting degree evaluation coefficient comprises a first evaluation coefficient, and the first evaluation coefficient is the ratio of the real-time current value of the outdoor fan to the complete frosting preset current value of the outdoor heat exchanger of the air conditioner; The step that the air conditioner meets the defrosting preset condition comprises the following steps: Obtaining the coil temperature of the outdoor heat exchanger, the outdoor environment temperature and the outdoor environment relative humidity; According to the outdoor environment temperature and the outdoor environment relative humidity, determining the defrosting preset temperature; Determining that the coil temperature of the outdoor heat exchanger is less than the defrosting preset temperature, and the air conditioner meets the defrosting preset condition; According to the outdoor environment temperature and the outdoor environment relative humidity, determining the defrosting preset temperature comprises the following steps: When the outdoor environment temperature is greater than or equal to zero and less than a second preset temperature, and the outdoor environment relative humidity is greater than a set humidity, determining that the defrosting preset temperature is less than or equal to a first set value; When the outdoor environment temperature is greater than or equal to zero and less than a second preset temperature, and the outdoor environment relative humidity is less than or equal to a set humidity, determining that the defrosting preset temperature is less than or equal to a second set value; The first set value is greater than the second set value.

2. The defrosting control method of the air conditioner according to claim 1, wherein The step that the frosting degree evaluation coefficient meets the first preset condition comprises the following steps: Detecting the real-time current value of the outdoor fan every first preset time length, and continuously obtaining the first evaluation coefficient corresponding to the real-time current value for multiple times; If the current first evaluation coefficient is greater than or equal to 1, and the ratio of the previous N first evaluation coefficients to the current first evaluation coefficient reaches a first target preset value, it is determined that the frosting degree evaluation coefficient meets the first preset condition; N is an integer greater than or equal to 1.

3. The defrost control method of claim 1, wherein, The step that the air conditioner executes the defrosting strategy comprises the following steps: After the air conditioner enters defrosting, obtaining the running state of the indoor unit of the air conditioner and the outdoor environment temperature; When the indoor unit is in the running state, it is determined that the outdoor environment temperature is greater than or equal to a first preset temperature, the fan of the indoor unit is controlled to be closed, and the electric auxiliary heater of the indoor unit is turned on; It is determined that the outdoor environment temperature is less than the first preset temperature, the fan of the indoor unit is controlled to run to a low wind mode, and the electric auxiliary heater of the indoor unit is turned on.

4. The defrosting control method of the air conditioner according to claim 3, wherein The step that the air conditioner executes the defrosting strategy further comprises the following steps: When the indoor unit is in the standby state, it is determined that the outdoor environment temperature is greater than or equal to the first preset temperature, the fan and the electric auxiliary heater of the indoor unit are controlled to be closed; It is determined that the outdoor environment temperature is less than the first preset temperature, the fan of the indoor unit is controlled to be closed, and the electric auxiliary heater of the indoor unit is turned on.

5. The defrosting control method of the air conditioner according to claim 3, wherein The step that the air conditioner executes the defrosting strategy further comprises the following steps: After the air conditioner enters defrosting, obtaining the refrigerant high-pressure pressure in the running process of the air conditioner; According to the refrigerant high-pressure pressure, a frequency of a compressor of the air conditioner is controlled.

6. The defrost control method of claim 1, wherein, According to the outdoor environment temperature and the outdoor environment relative humidity, the step of determining the defrost preset temperature further comprises: When the outdoor environment temperature is greater than or equal to the second preset temperature, the defrost preset temperature is determined to be less than or equal to the second set value.

7. The defrost control method of claim 1, wherein, According to the outdoor environment temperature and the outdoor environment relative humidity, the step of determining the defrost preset temperature further comprises: When the outdoor environment temperature is greater than or equal to a third preset temperature and less than zero, and the outdoor environment relative humidity is greater than a set humidity, a difference between the defrost preset temperature and the outdoor environment temperature is determined to be less than or equal to the first set value. When the outdoor environment temperature is greater than or equal to the third preset temperature and less than zero, and the outdoor environment relative humidity is less than or equal to the set humidity, the difference between the defrost preset temperature and the outdoor environment temperature is determined to be less than or equal to the second set value.

8. The defrosting control method of the air conditioner according to claim 7, wherein According to the outdoor environment temperature and the outdoor environment relative humidity, the step of determining the defrost preset temperature further comprises: When the outdoor environment temperature is less than the third preset temperature, the difference between the defrost preset temperature and the outdoor environment temperature is determined to be less than or equal to the second set value, or the defrost preset temperature is determined to be less than or equal to a third set value. The third set value is less than the second set value.

9. The defrosting control method of an air conditioner according to any one of claims 1 to 8, characterized by, The defrost control method further comprises: When the air conditioner meets a defrost preset condition, a real-time current value of an outdoor fan of the air conditioner is detected; According to the real-time current value of the outdoor fan, a frosting degree evaluation coefficient of the air conditioner is obtained; When the frosting degree evaluation coefficient meets a second preset condition, the air conditioner is controlled to exit defrosting. The frosting degree evaluation coefficient further comprises a second evaluation coefficient, and the second evaluation coefficient is a ratio of a completely frost-free preset current value of an outdoor heat exchanger of the air conditioner to the real-time current value of the outdoor fan.

10. The defrost control method of claim 9, wherein, The step of determining that the frosting degree evaluation coefficient meets the second preset condition specifically comprises: The real-time current value of the outdoor fan is detected every second preset time length, and the second evaluation coefficient corresponding to the real-time current value is obtained continuously for multiple times; If the second evaluation coefficient detected continuously for multiple times is all greater than or equal to a second target preset value, it is determined that the frosting degree evaluation coefficient meets the second preset condition.

11. The defrost control method of claim 9, wherein, The step that the air conditioner meets the defrost preset condition specifically comprises: A coil temperature of an outdoor unit is obtained; When the coil temperature of the outdoor unit is greater than or equal to a fourth preset temperature, it is determined that the air conditioner meets the defrost preset condition.

12. A defrosting control device for an air conditioner, characterized in that, The method comprises: A detection module is configured to detect a real-time current value of an outdoor fan of an air conditioner when the air conditioner meets a defrost preset condition; An obtaining module is configured to obtain a frosting degree evaluation coefficient of the air conditioner according to the real-time current value of the outdoor fan; A control module is configured to determine that the frosting degree evaluation coefficient meets a first preset condition, and control the air conditioner to execute a defrosting strategy. The frosting degree evaluation coefficient comprises a first evaluation coefficient, which is a ratio of a real-time current value of the outdoor fan to a preset current value of the outdoor heat exchanger of the air conditioner when the outdoor heat exchanger is completely frosted. The step of determining whether the air conditioner meets the preset defrosting condition comprises: obtaining a coil temperature of the outdoor heat exchanger, an outdoor ambient temperature, and an outdoor ambient relative humidity; determining a defrosting preset temperature according to the outdoor ambient temperature and the outdoor ambient relative humidity; determining that the air conditioner meets the preset defrosting condition when the coil temperature of the outdoor heat exchanger is less than the defrosting preset temperature; the step of determining the defrosting preset temperature according to the outdoor ambient temperature and the outdoor ambient relative humidity comprises: when the outdoor ambient temperature is greater than or equal to zero and less than a second preset temperature, and the outdoor ambient relative humidity is greater than a set humidity, determining that the defrosting preset temperature is less than or equal to a first set value; when the outdoor ambient temperature is greater than or equal to zero and less than the second preset temperature, and the outdoor ambient relative humidity is less than or equal to the set humidity, determining that the defrosting preset temperature is less than or equal to a second set value; wherein the first set value is greater than the second set value.

13. An air conditioner comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to implement the defrosting control method of the air conditioner according to any one of claims 1-11.

Images