Defrosting control method and defrosting control device of air conditioner and air conditioner

Abstract

The invention provides a defrosting control method and device of an air conditioner and the air conditioner. The defrosting control method comprises the steps that in a heating mode, the condenser outlet temperature of the air conditioner is obtained; when it is determined that the outlet temperature of the condenser meets a set defrosting condition, target defrosting parameters are obtained; under the condition that the flow direction of a four-way valve is not changed, the air conditioner is controlled to enter a defrosting mode according to the target defrosting parameters; wherein the target defrosting parameters comprise the target defrosting frequency of a compressor and the target valve opening degree of an expansion valve. According to the defrosting control method and device of the air conditioner and the air conditioner, the opening degree of the expansion valve is adjusted, flow broadening is carried out under the non-stop condition, the air conditioner carries out non-stop defrosting, and the user experience is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliances, and in particular to a defrosting control method and a defrosting control device for an air conditioner and an air conditioner. Background Art

[0002] In the related technologies, traditional defrosting technologies mainly include shutdown defrosting, four-way valve switching defrosting and electric heating defrosting. Shutdown defrosting will cause large fluctuations in indoor temperature, affecting user comfort and increasing energy consumption; although four-way valve switching defrosting does not completely shut down, frequent switching will increase system wear and energy consumption, and also cause indoor temperature fluctuations; although electric heating defrosting is effective, it has high energy consumption, high maintenance costs and safety hazards. The common disadvantage of these technologies is that they cannot achieve efficient defrosting while ensuring indoor comfort. Summary of the invention

[0003] The present invention provides a defrost control method, a defrost control device and an air conditioner for an air conditioner, so as to solve the defects existing in the prior art and achieve the following technical effects: by adjusting the opening of the expansion valve, the air flow is expanded without stopping the machine, so that the air conditioner can be defrosted without stopping the machine, thereby ensuring the user experience.

[0004] According to a first aspect of the present invention, a defrost control method for an air conditioner includes: In heating mode, obtain the condenser outlet temperature of the air conditioner; Determining that the condenser outlet temperature meets the set defrost condition, then obtaining a target defrost parameter; When the flow direction of the four-way valve remains unchanged, controlling the air conditioner to enter a defrost mode according to the target defrost parameter; The target defrost parameters include a target defrost frequency of the compressor and a target valve opening of the expansion valve.

[0005] According to an embodiment of the present invention, the step of obtaining the target defrost parameter specifically includes: Get the outdoor ambient temperature of the environment where the outdoor unit is located; determining a target defrost frequency of the compressor according to the outdoor ambient temperature; The target valve opening of the expansion valve is calculated according to the target defrosting frequency.

[0006] According to an embodiment of the present invention, the step of calculating the target valve opening of the expansion valve according to the target defrosting frequency specifically includes: The target valve opening of the expansion valve is calculated according to the target defrosting frequency, the model of the air conditioner, and the current valve opening of the expansion valve.

[0007] According to one embodiment of the present invention, in the step of calculating the target valve opening of the expansion valve according to the target defrosting frequency, the calculation formula of the target valve opening is: Among them, Y is the target valve opening, x is the target defrost frequency, A is the slope control coefficient, B is the compensation coefficient, and c is the air conditioner model coefficient. The slope control coefficient is determined according to the current valve opening, and the air conditioner model coefficient is determined according to the model of the air conditioner.

[0008] According to an embodiment of the present invention, the step of determining the target defrost frequency of the compressor according to the outdoor ambient temperature specifically includes: When the outdoor ambient temperature is within a first temperature range, determining the target defrost frequency to be a first defrost frequency; When the outdoor ambient temperature is within a second temperature range, determining the target defrost frequency to be a second defrost frequency; When the outdoor ambient temperature is within a third temperature range, determining the target defrosting frequency to be the maximum frequency of the compressor; The first temperature range is greater than or equal to the second temperature range, and the second temperature range is greater than or equal to the third temperature range, and the first defrost frequency is less than or equal to the second defrost frequency, and the second defrost frequency is less than or equal to the maximum frequency of the compressor.

[0009] According to an embodiment of the present invention, in the step of determining whether the condenser outlet temperature satisfies a set defrost condition, the set defrost condition includes: the condenser outlet temperature is continuously lower than a set defrost temperature for a set time period.

[0010] According to one embodiment of the present invention, after the step of controlling the air conditioner to enter the defrost mode according to the target defrost parameter, the method further includes: Obtaining the indoor coil temperature of the air conditioner; The speed of the indoor fan is controlled and adjusted according to the indoor coil temperature.

[0011] According to an embodiment of the present invention, the step of controlling and adjusting the speed of the indoor fan according to the indoor coil temperature specifically includes: When the indoor coil temperature is in the fourth temperature range, controlling the rotation speed of the indoor fan to be the first rotation speed; When the indoor coil temperature is in the fifth temperature range, controlling the speed of the indoor fan to be the second speed; When the indoor coil temperature is in the sixth temperature range, controlling the speed of the indoor fan to be the minimum speed of the fan; Among them, the fourth temperature interval is less than or equal to the fifth temperature interval, and the fifth temperature interval is less than or equal to the sixth temperature interval, and the first speed is greater than or equal to the second speed, and the second speed is greater than or equal to the minimum speed of the fan.

[0012] According to a second aspect of the present invention, a defrost control device for an air conditioner includes: The first acquisition module is used to obtain the condenser outlet temperature of the air conditioner in the heating mode; A second acquisition module, used to determine that the condenser outlet temperature meets the set defrost condition, and then obtain the target defrost parameter; A control module, used for controlling the air conditioner to enter a defrost mode according to the target defrost parameter when the flow direction of the four-way valve remains unchanged; The target defrost parameters include a target defrost frequency of the compressor and a target valve opening of the expansion valve.

[0013] An air conditioner according to an embodiment of the third aspect of the present invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the defrost control method for the air conditioner as described in the embodiment of the first aspect of the present invention is implemented.

[0014] The present invention provides a defrosting control method for an air conditioner. The method utilizes the adjustment of the opening of an expansion valve to expand the flow without stopping the air conditioner, so that the air conditioner can be defrosted without stopping the air conditioner, thereby ensuring user experience.

[0015] Furthermore, compared with the related art, the present invention has at least the following advantages.

[0016] (1) Stable indoor temperature: By performing defrosting without changing the flow direction of the four-way valve, indoor temperature fluctuations caused by shutdown and four-way valve switching are avoided, ensuring that users can still enjoy a stable indoor temperature during the defrosting process, thereby improving comfort.

[0017] (2) High energy efficiency ratio: By adjusting the compressor frequency and the expansion valve opening, the flow rate and flow velocity of the refrigerant are increased, an efficient defrosting process is achieved, and the frequent start-stop and switching in traditional methods are avoided, thus reducing energy consumption and improving the overall energy efficiency ratio of the system.

[0018] (3) Less system wear: Since there is no need to frequently switch the four-way valve or shut down, the wear of mechanical parts is reduced, the service life of the system is extended, and the maintenance cost is reduced.

[0019] (4) Safe and reliable: Compared with electric heating defrosting, the present invention avoids the potential safety hazards caused by electric heating elements and improves the safety and reliability of the system.

[0020] (5) Intelligent control: By real-time monitoring of the condenser outlet temperature and dynamically adjusting the defrost parameters, intelligent defrost control is achieved, which can flexibly respond to actual working conditions and improve the adaptability and flexibility of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is one of the flow charts of the defrosting control method for an air conditioner provided by the present invention.

[0023] Figure 2 This is the second flow chart of the defrosting control method for the air conditioner provided by the present invention.

[0024] Figure 3 It is a structural schematic diagram of the defrost control device of the air conditioner provided by the present invention.

[0025] Figure 4 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0028] The defrost control method, defrost control device and air conditioner of the air conditioner proposed by the present invention are described below with reference to the accompanying drawings. Before the embodiments of the present invention are described in detail, the entire application scenario is described first. The defrost control method, control device, electronic device and computer-readable storage medium of the air conditioner of the embodiment of the present invention can be applied to the air conditioner locally, to the cloud platform in the Internet field, or to other types of cloud platforms in the Internet field, or to third-party devices. Among them, the third-party device may include many different types such as mobile phones, tablet computers, notebooks, car computers and other smart terminals.

[0029] The following description will only take the defrost control method applicable to an air conditioner as an example. It should be understood that the defrost control method of the embodiment of the present invention can also be applicable to a cloud platform and third-party equipment.

[0030] like Figure 1 As shown, the defrost control method of the air conditioner according to the first embodiment of the present invention includes: Step S1, in heating mode, obtaining the condenser outlet temperature of the air conditioner.

[0031] In step S1, when the air conditioner is in heating mode, the outlet temperature of the condenser (i.e., the outdoor heat exchanger) is monitored and obtained in real time through the temperature sensor. In this way, by monitoring the outlet temperature of the condenser, it is possible to promptly detect whether frost has begun to form on the surface of the condenser, thereby providing a basis for subsequent defrosting decisions.

[0032] For example, a high-precision temperature sensor is installed at the outlet of the air conditioner's condenser, which sends temperature data to the air conditioner's control system in real time. The control system reads the temperature data at regular intervals (such as 1 minute) and records it.

[0033] In addition to the outlet temperature, the temperatures of other key points, such as the condenser inlet temperature, ambient temperature, etc., can also be monitored to more comprehensively assess the frosting situation. In addition, multiple sensors can be used for redundant design to improve the reliability and accuracy of the data.

[0034] Step S2, determining that the condenser outlet temperature meets the set defrost condition, and obtaining the target defrost parameter.

[0035] In step S2, the control system determines whether the preset defrosting condition is met according to the obtained condenser outlet temperature. If the condition is met, the target defrosting parameter is read from the memory. In this way, by setting the defrosting condition, it can be ensured that the defrosting program is started only when the condenser really needs to be defrosted, avoiding unnecessary energy consumption and system burden.

[0036] Assume that the preset defrost condition is that the condenser outlet temperature is lower than 0°C and lasts for at least 1 minute. The control system triggers the defrost condition when it detects that the outlet temperature is lower than 0°C and lasts for at least 1 minute. Subsequently, the control system reads the preset target defrost parameters from the memory, which include the target defrost frequency of the compressor and the target valve opening of the expansion valve.

[0037] In addition, the defrost conditions can be more complex, for example, combined with operating time, ambient humidity and other factors. The target defrost parameters can also be dynamically adjusted according to different environmental conditions to adapt to different operating scenarios.

[0038] Step S3, when the flow direction of the four-way valve remains unchanged, the air conditioner is controlled to enter the defrost mode according to the target defrost parameters, wherein the target defrost parameters include the target defrost frequency of the compressor and the target valve opening of the expansion valve.

[0039] In step S3, after confirming that defrosting is required, the control system adjusts the operating frequency of the compressor and the opening of the expansion valve without changing the flow direction of the four-way valve, and widens the circulating refrigerant in the air conditioner, thereby putting the air conditioner into defrost mode.

[0040] In this way, when the flow direction of the four-way valve remains unchanged, defrosting is performed by wide flow, which can avoid indoor temperature fluctuations caused by switching the four-way valve and ensure user comfort. At the same time, by adjusting the compressor frequency and the expansion valve opening, the defrosting efficiency can be effectively improved.

[0041] For example, suppose the target defrost parameters are 100Hz compressor frequency and 50% expansion valve opening. After the defrost condition is triggered, the control system adjusts the compressor operating frequency to 150Hz and the expansion valve opening to 80%. These adjustments increase the refrigerant flow, flow rate and temperature, thereby quickly taking away the cold on the condenser surface and achieving defrosting.

[0042] In addition, more sophisticated control strategies can be introduced in this step, such as gradually adjusting the compressor frequency and expansion valve opening to avoid sudden and large changes in the system. In addition, the defrosting parameters can be dynamically adjusted in combination with indoor temperature feedback to ensure the stability of the indoor temperature.

[0043] It can be understood that the working principle of the defrost control method of the air conditioner of the present invention is as follows: the defrost method of the present invention monitors the condenser outlet temperature in real time in the heating mode. When the temperature drops to the preset defrost condition, the control system reads the target defrost parameters (such as the target defrost frequency of the compressor and the target valve opening of the expansion valve) from the memory, and adjusts the compressor frequency and the expansion valve opening without changing the flow direction of the four-way valve to increase the flow and flow rate of the refrigerant, quickly take away the cold from the condenser surface, achieve efficient defrosting, and maintain indoor comfort by adjusting the indoor fan speed.

[0044] Furthermore, the specific working process of the defrosting control method of the air conditioner according to the embodiment of the present invention is as follows: in the heating mode, the temperature sensor monitors the condenser outlet temperature in real time. When the temperature is lower than the preset defrosting condition, the control system reads the target defrosting parameters, adjusts the compressor frequency and the expansion valve opening, increases the refrigerant flow and flow rate, and quickly takes away the cold on the condenser surface to achieve defrosting. In this process, the flow direction of the four-way valve remains unchanged to ensure that the indoor heating continues, and at the same time, the indoor fan speed is appropriately reduced to maintain the indoor temperature stable, until the condenser outlet temperature returns to the preset value, and the control system restores the normal heating parameters to complete the defrosting process.

[0045] In the related technologies, traditional defrosting technologies mainly include shutdown defrosting, four-way valve switching defrosting and electric heating defrosting. Shutdown defrosting will cause large fluctuations in indoor temperature, affecting user comfort and increasing energy consumption; although four-way valve switching defrosting does not completely shut down, frequent switching will increase system wear and energy consumption, and also cause indoor temperature fluctuations; although electric heating defrosting is effective, it has high energy consumption, high maintenance costs and safety hazards. The common disadvantage of these technologies is that they cannot achieve efficient defrosting while ensuring indoor comfort.

[0046] Therefore, in order to solve the technical defects existing in the above-mentioned related technologies, the present invention provides a defrost control method for an air conditioner. The method utilizes the adjustment of the opening of the expansion valve to perform wide flow without stopping the air conditioner, so that the air conditioner can defrost without stopping, thereby ensuring user experience.

[0047] Furthermore, compared with the related art, the present invention has at least the following advantages.

[0048] (1) Stable indoor temperature: By performing defrosting without changing the flow direction of the four-way valve, indoor temperature fluctuations caused by shutdown and four-way valve switching are avoided, ensuring that users can still enjoy a stable indoor temperature during the defrosting process, thereby improving comfort.

[0049] (2) High energy efficiency ratio: By adjusting the compressor frequency and the expansion valve opening, the flow rate and flow velocity of the refrigerant are increased, an efficient defrosting process is achieved, and the frequent start-stop and switching in traditional methods are avoided, thus reducing energy consumption and improving the overall energy efficiency ratio of the system.

[0050] (3) Less system wear: Since there is no need to frequently switch the four-way valve or shut down, the wear of mechanical parts is reduced, the service life of the system is extended, and the maintenance cost is reduced.

[0051] (4) Safe and reliable: Compared with electric heating defrosting, the present invention avoids the potential safety hazards caused by electric heating elements and improves the safety and reliability of the system.

[0052] (5) Intelligent control: By real-time monitoring of the condenser outlet temperature and dynamically adjusting the defrost parameters, intelligent defrost control is achieved, which can flexibly respond to actual working conditions and improve the adaptability and flexibility of the system.

[0053] like Figure 2 As shown, according to some embodiments of the present invention, the step of obtaining the target defrost parameter specifically includes: Get the outdoor ambient temperature of the environment where the outdoor unit is located; Determine the target defrost frequency of the compressor according to the outdoor ambient temperature; According to the target defrost frequency, the target valve opening of the expansion valve is calculated.

[0054] In this embodiment, after determining that defrosting is required, the control system first obtains the outdoor ambient temperature of the environment where the outdoor unit is located through a temperature sensor installed near the outdoor unit. The outdoor ambient temperature is one of the important factors affecting the defrosting effect, so obtaining accurate outdoor ambient temperature provides data support for subsequent parameter adjustments.

[0055] Next, the control system determines the target defrost frequency of the compressor from a preset mapping table or algorithm based on the obtained outdoor ambient temperature. The optimal defrost frequency of the compressor will be different under different outdoor ambient temperatures. By adjusting the compressor frequency according to the outdoor ambient temperature, efficient defrosting can be achieved in different environments.

[0056] Finally, the control system calculates the target valve opening of the expansion valve based on the determined compressor target defrosting frequency through a preset algorithm or mapping table. The opening of the expansion valve directly affects the amount of refrigerant entering the condenser, thereby affecting the defrosting effect. By adjusting the expansion valve opening according to the compressor frequency, the flow and flow rate of the refrigerant can be optimized to achieve the best defrosting effect.

[0057] According to some embodiments of the present invention, the step of calculating the target valve opening of the expansion valve according to the target defrosting frequency specifically includes: The target valve opening of the expansion valve is calculated according to the target defrosting frequency, the model of the air conditioner, and the current valve opening of the expansion valve.

[0058] It can be understood that when calculating the target valve opening of the expansion valve, the control system comprehensively considers the target defrost frequency, the model of the air conditioner and the current valve opening of the expansion valve. The influence of the above three parameters on the target valve opening is introduced below.

[0059] Among them, the target defrost frequency directly affects the flow and velocity of the refrigerant. A higher target defrost frequency means that the compressor runs faster, the refrigerant flow and velocity are greater, and a larger expansion valve opening is required to match this high flow to ensure that the refrigerant can pass through the condenser smoothly and take away more cold air. In this way, by adjusting the target defrost frequency, the defrost effect can be optimized. A higher frequency can take away the cold air on the condenser surface faster and accelerate the defrost process.

[0060] Different models of air conditioners have different system designs and parameter characteristics, including refrigerant type, pipe length, heat exchanger area, etc. These characteristics will affect the working efficiency and optimal opening of the expansion valve. In this way, the air conditioner model factor is used to correct the expansion valve opening to ensure the best defrosting effect on different models of air conditioners. For example, some models of air conditioners may require a larger expansion valve opening to adapt to their system design, while other models may require a smaller opening.

[0061] The current valve opening of the expansion valve is the basis for calculating the target valve opening. By considering the current valve opening, a smooth transition to the new target valve opening can be achieved, avoiding the impact of sudden and large changes on the system. In this way, gradually adjusting the expansion valve opening can reduce sudden changes in system pressure and improve the stability and reliability of the system. In addition, gradual adjustment also helps to avoid sudden changes in refrigerant flow and reduce the impact on indoor temperature.

[0062] Furthermore, in the step of calculating the target valve opening of the expansion valve according to the target defrosting frequency, the calculation formula of the target valve opening is: Among them, Y is the target valve opening, x is the target defrost frequency, A is the slope control coefficient, B is the compensation coefficient, and c is the air conditioner model coefficient. The slope control coefficient is determined according to the current valve opening, and the air conditioner model coefficient is determined according to the model of the air conditioner.

[0063] It can be understood that the compressor's target defrost frequency is in Hertz (Hz). The target defrost frequency directly affects the flow and velocity of the refrigerant. A higher target defrost frequency means that the compressor runs faster, the refrigerant flow and velocity are greater, and a larger expansion valve opening is required to match this high flow to ensure that the refrigerant can pass through the condenser smoothly and take away more cooling capacity.

[0064] The slope control coefficient is used to adjust the rate of change of the target valve opening. The slope control coefficient is determined based on the current valve opening, which can ensure that the change of the target valve opening is smoother and more reasonable under different initial conditions. For example, if the current valve opening is large, the slope control coefficient may be small to avoid system shock caused by excessive target valve opening.

[0065] The compensation coefficient is used to correct the calculation results to ensure that the target valve opening is within a reasonable range. The compensation coefficient can be adjusted according to actual operating conditions and empirical data to ensure that the target valve opening can adapt to different operating conditions.

[0066] The air conditioner model coefficient is determined according to the model of the air conditioner, reflecting the system characteristics and parameter differences of different models of air conditioners. The air conditioner model coefficient is used to correct the target valve opening to ensure the best defrosting effect on different models of air conditioners. For example, some models of air conditioners may require a larger expansion valve opening to adapt to their system design, while other models may require a smaller opening.

[0067] From the above, the specific calculation process of the target valve opening is as follows: Determine the target defrost frequency x of the compressor through the outdoor ambient temperature. Determine the slope control coefficient A according to the current valve opening of the expansion valve. For example, if the current valve opening is 50%, the value of A can be determined based on empirical data or a preset mapping table. Subsequently, determine the compensation coefficient B based on the actual operating conditions and empirical data. For example, the compensation coefficient can be set to a fixed value or dynamically adjusted according to the current operating status. Determine the air conditioner model coefficient c according to the model of the air conditioner. For example, different models of air conditioners may have different c values, which can be obtained from the preset mapping table. Finally, substitute the above parameters into the formula Calculate and obtain the target valve opening Y.

[0068] In summary, through the above-mentioned calculation formula and specific embodiments, the present invention comprehensively considers the target defrost frequency, the model of the air conditioner and the current valve opening of the expansion valve when calculating the target valve opening of the expansion valve, ensuring that efficient defrost effect can be achieved under different environmental conditions while maintaining indoor comfort, thereby improving the overall performance of the system and user experience.

[0069] According to some embodiments of the present invention, the step of determining the target defrost frequency of the compressor according to the outdoor ambient temperature specifically includes: When the outdoor ambient temperature is within a first temperature range, determining the target defrost frequency to be a first defrost frequency; When the outdoor ambient temperature is within the second temperature range, determining the target defrost frequency to be the second defrost frequency; When the outdoor ambient temperature is in the third temperature interval, the target defrosting frequency is determined to be the maximum frequency of the compressor.

[0070] The first temperature range is greater than or equal to the second temperature range, and the second temperature range is greater than or equal to the third temperature range, and the first defrost frequency is less than or equal to the second defrost frequency, and the second defrost frequency is less than or equal to the maximum frequency of the compressor.

[0071] It should be explained that, in this embodiment, the first temperature interval is a situation where the outdoor ambient temperature is high but defrosting is still required. In this case, the operating frequency of the compressor is low, which can effectively prevent excessive defrosting while maintaining the energy efficiency ratio of the system.

[0072] The second temperature range is when the outdoor ambient temperature is moderate and a stronger defrosting capability is required. In this case, the compressor operates at a moderate frequency, which can effectively defrost while maintaining system stability and energy efficiency.

[0073] The third temperature range is when the outdoor ambient temperature is low and the strongest defrosting capacity is required. In this case, the compressor runs at the maximum frequency to ensure fast defrosting and prevent severe frost on the condenser that affects system performance.

[0074] For example, after determining that defrosting is required, the control system first obtains the outdoor ambient temperature through a temperature sensor installed near the outdoor unit. According to the temperature range to which the outdoor ambient temperature belongs, the control system determines the target defrosting frequency of the compressor.

[0075] If the outdoor ambient temperature is between 0°C and 5°C, the control system determines the target defrost frequency to be 80Hz.

[0076] If the outdoor ambient temperature is between -5°C and 0°C, the control system determines the target defrost frequency to be 100Hz.

[0077] If the outdoor ambient temperature is lower than -5°C, the control system determines the target defrost frequency as the maximum frequency of the compressor, 120Hz.

[0078] In summary, in this way, the control system can dynamically adjust the operating frequency of the compressor according to different outdoor ambient temperatures, ensuring efficient defrosting effects in different environments while maintaining the stability and energy efficiency of the system.

[0079] According to some embodiments of the present invention, in the step of determining whether the condenser outlet temperature satisfies a set defrost condition, the set defrost condition includes: the condenser outlet temperature is continuously lower than the set defrost temperature for a set time period.

[0080] In this embodiment, When the air conditioner is in heating mode, the temperature of the condenser outlet is monitored in real time through the temperature sensor installed at the outlet of the condenser (outdoor heat exchanger). Setting the defrost condition includes two main parameters: set defrost temperature and set time.

[0081] The defrost temperature is set as the preset temperature threshold. When the condenser outlet temperature is lower than this threshold, the system starts to consider defrosting. The duration is set as the preset time period. The condenser outlet temperature must be continuously lower than the set defrost temperature during this time period to trigger the defrost condition.

[0082] For example, read the condenser outlet temperature once every certain time (such as 1 minute) and record it. Check whether the condenser outlet temperature is continuously lower than the set defrost temperature (such as 0°C) within the set time (such as 5 minutes). If the condenser outlet temperature is continuously lower than the set defrost temperature within the set time, the control system determines that the defrost conditions are met and starts the defrost procedure.

[0083] In this way, by setting the defrost conditions, it can be ensured that the defrost program is started only when the condenser really needs to be defrosted, avoiding unnecessary energy consumption and system burden.

[0084] According to some embodiments of the present invention, after the step of controlling the air conditioner to enter the defrost mode according to the target defrost parameter, the defrost control method further includes: Get the indoor coil temperature of the air conditioner; The speed of the indoor fan is adjusted according to the indoor coil temperature control.

[0085] In this embodiment, a high-precision temperature sensor can be installed on the indoor coil to monitor the temperature of the indoor coil in real time. The temperature sensor sends the temperature data to the air conditioner control system in real time. The control system reads the indoor coil temperature data once every certain period of time (such as 1 minute) and records it.

[0086] Afterwards, the control system determines whether the speed of the indoor fan needs to be adjusted based on the obtained indoor coil temperature. According to a preset mapping table or algorithm, the control system adjusts the speed of the indoor fan to optimize the indoor temperature and airflow distribution.

[0087] Thus, through the above steps and specific embodiments, after controlling the air conditioner to enter the defrost mode according to the target defrost parameter, the present invention further obtains the indoor coil temperature and controls the speed of the indoor fan according to the temperature to ensure the stability and comfort of the indoor temperature. This process not only improves the defrost effect, but also optimizes the indoor environment and improves the overall user experience.

[0088] Further, the step of controlling and adjusting the speed of the indoor fan according to the indoor coil temperature specifically includes: When the indoor coil temperature is in the fourth temperature range, controlling the speed of the indoor fan to be the first speed; When the indoor coil temperature is in the fifth temperature range, controlling the speed of the indoor fan to be the second speed; When the indoor coil temperature is in the sixth temperature range, the rotation speed of the indoor fan is controlled to be the minimum rotation speed of the fan.

[0089] Among them, the fourth temperature interval is less than or equal to the fifth temperature interval, and the fifth temperature interval is less than or equal to the sixth temperature interval, and the first speed is greater than or equal to the second speed, and the second speed is greater than or equal to the minimum speed of the fan.

[0090] For example, the temperature sensor installed on the indoor coil monitors the temperature of the indoor coil in real time. The temperature data is read and recorded at regular intervals (such as 1 minute). The speed of the indoor fan is adjusted according to the indoor coil temperature control.

[0091] If the indoor coil temperature is 25°C or below, the control system adjusts the speed of the indoor fan to the first speed (80%). If the indoor coil temperature is between 25°C and 30°C, the control system adjusts the speed of the indoor fan to the second speed (50%). If the indoor coil temperature is higher than 30°C, the control system adjusts the speed of the indoor fan to the minimum fan speed (30%).

[0092] The defrost control device of an air conditioner provided by the present invention is described below. The defrost control device of an air conditioner described below and the defrost control method of an air conditioner described above can be referred to each other.

[0093] like Figure 3 As shown, the defrost control device of the air conditioner according to the second aspect of the present invention comprises: The first acquisition module 110 is used to obtain the condenser outlet temperature of the air conditioner in the heating mode; The second acquisition module 120 is used to determine that the condenser outlet temperature meets the set defrosting condition, and then obtain the target defrosting parameter; The control module 130 is used to control the air conditioner to enter the defrost mode according to the target defrost parameter when the flow direction of the four-way valve remains unchanged.

[0094] The target defrost parameters include a target defrost frequency of the compressor and a target valve opening of the expansion valve.

[0095] An air conditioner according to an embodiment of the third aspect of the present invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, a defrost control method for the air conditioner according to an embodiment of the first aspect of the present invention is implemented.

[0096] Figure 4 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 4As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication interface 820 and the memory 830 communicate with each other through the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute the defrost control method of the air conditioner, including: in the heating mode, obtaining the condenser outlet temperature of the air conditioner; determining that the condenser outlet temperature meets the set defrost condition, then obtaining the target defrost parameter; when the flow direction of the four-way valve remains unchanged, controlling the air conditioner to enter the defrost mode according to the target defrost parameter. The target defrost parameter includes the target defrost frequency of the compressor and the target valve opening of the expansion valve.

[0097] In addition, the logic instructions in the above-mentioned memory 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0098] On the other hand, the present invention also provides a computer program product, which includes a computer program, which 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 defrost control method of the air conditioner provided by the above methods, including: in the heating mode, obtaining the condenser outlet temperature of the air conditioner; determining that the condenser outlet temperature meets the set defrost condition, then obtaining the target defrost parameter; when the flow direction of the four-way valve remains unchanged, controlling the air conditioner to enter the defrost mode according to the target defrost parameter. The target defrost parameter includes the target defrost frequency of the compressor and the target valve opening of the expansion valve.

[0099] On the other hand, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the defrost control method of the air conditioner provided by the above methods is implemented, including: in the heating mode, obtaining the condenser outlet temperature of the air conditioner; determining that the condenser outlet temperature meets the set defrost condition, then obtaining the target defrost parameter; when the flow direction of the four-way valve remains unchanged, controlling the air conditioner to enter the defrost mode according to the target defrost parameter. The target defrost parameter includes the target defrost frequency of the compressor and the target valve opening of the expansion valve.

[0100] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0101] Through the description of the above implementation modes, those skilled in the art can clearly understand that each implementation mode can be implemented by means of software plus a necessary general hardware platform, or of course by hardware. Based on such an understanding, the above technical solution can essentially or in other words be embodied in the form of a software product that contributes to the prior art. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiment.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A defrosting control method for an air conditioner, characterized in that: include: In heating mode, obtain the condenser outlet temperature of the air conditioner; Determining that the condenser outlet temperature meets the set defrost condition, then obtaining a target defrost parameter; When the flow direction of the four-way valve remains unchanged, controlling the air conditioner to enter a defrost mode according to the target defrost parameter; The target defrost parameters include a target defrost frequency of the compressor and a target valve opening of the expansion valve.

2. The defrosting control method of the air conditioner according to claim 1, characterized in that: The step of obtaining the target defrost parameter specifically includes: Get the outdoor ambient temperature of the environment where the outdoor unit is located; determining a target defrost frequency of the compressor according to the outdoor ambient temperature; The target valve opening of the expansion valve is calculated according to the target defrosting frequency.

3. The defrosting control method of the air conditioner according to claim 2, characterized in that: The step of calculating the target valve opening of the expansion valve according to the target defrosting frequency specifically includes: The target valve opening of the expansion valve is calculated according to the target defrosting frequency, the model of the air conditioner, and the current valve opening of the expansion valve.

4. The defrosting control method of the air conditioner according to claim 3, characterized in that: In the step of calculating the target valve opening of the expansion valve according to the target defrosting frequency, the calculation formula of the target valve opening is: Among them, Y is the target valve opening, x is the target defrost frequency, A is the slope control coefficient, B is the compensation coefficient, and c is the air conditioner model coefficient. The slope control coefficient is determined according to the current valve opening, and the air conditioner model coefficient is determined according to the model of the air conditioner.

5. The defrosting control method of an air conditioner according to claim 2, characterized in that: The step of determining the target defrost frequency of the compressor according to the outdoor ambient temperature specifically includes: When the outdoor ambient temperature is within a first temperature range, determining the target defrost frequency to be a first defrost frequency; When the outdoor ambient temperature is within a second temperature range, determining the target defrost frequency to be a second defrost frequency; When the outdoor ambient temperature is within a third temperature range, determining the target defrosting frequency to be the maximum frequency of the compressor; The first temperature range is greater than or equal to the second temperature range, and the second temperature range is greater than or equal to the third temperature range, and the first defrost frequency is less than or equal to the second defrost frequency, and the second defrost frequency is less than or equal to the maximum frequency of the compressor.

6. The defrosting control method for an air conditioner according to any one of claims 1 to 5, characterized in that: In the step of determining whether the condenser outlet temperature satisfies a set defrost condition, the set defrost condition includes: the condenser outlet temperature is continuously lower than a set defrost temperature within a set time period.

7. The defrosting control method for an air conditioner according to any one of claims 1 to 5, characterized in that: After the step of controlling the air conditioner to enter the defrost mode according to the target defrost parameter, the method further includes: Obtaining the indoor coil temperature of the air conditioner; The speed of the indoor fan is controlled and adjusted according to the indoor coil temperature.

8. The defrosting control method of an air conditioner according to claim 7, characterized in that: The step of controlling and adjusting the speed of the indoor fan according to the temperature of the indoor coil specifically includes: When the indoor coil temperature is in the fourth temperature range, controlling the rotation speed of the indoor fan to be the first rotation speed; When the indoor coil temperature is in the fifth temperature range, controlling the rotation speed of the indoor fan to be the second rotation speed; When the indoor coil temperature is in the sixth temperature range, controlling the speed of the indoor fan to be the minimum speed of the fan; Among them, the fourth temperature interval is less than or equal to the fifth temperature interval, and the fifth temperature interval is less than or equal to the sixth temperature interval, and the first speed is greater than or equal to the second speed, and the second speed is greater than or equal to the minimum speed of the fan.

9. A defrost control device for an air conditioner, characterized in that: include: The first acquisition module is used to obtain the condenser outlet temperature of the air conditioner in the heating mode; A second acquisition module, used to determine that the condenser outlet temperature meets the set defrosting condition, and then obtain the target defrosting parameter; A control module, used for controlling the air conditioner to enter a defrost mode according to the target defrost parameter when the flow direction of the four-way valve remains unchanged; The target defrost parameters include a target defrost frequency of the compressor and a target valve opening of the expansion valve.

10. An air conditioner comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the defrost control method for the air conditioner according to any one of claims 1 to 8 is implemented.

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