Defrosting control method and device, control equipment and computer storage medium

Abstract

The invention discloses a defrosting control method and device, control equipment and a computer storage medium, and relates to the technical field of air conditioning equipment control. The method comprises the steps that under the condition that a target air conditioner meets the thin frost rapid melting condition, the average frequency of a compressor of the target air conditioner within the first preset duration is obtained; determining a target frequency based on the average frequency and a preset safe frequency range, the target frequency being within the safe frequency range; and based on the target frequency, a compressor is controlled to operate, and a bypass loop of the target air conditioner is controlled to be conducted, so that part of high-temperature refrigerant released by the compressor flows back to an outdoor heat exchanger of the target air conditioner from the bypass loop to be defrosted. On the basis that the air conditioning system is effectively defrosted, the influence on the indoor heating effect is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning equipment control, and in particular to a defrost control method, device, control equipment and computer storage medium. Background Art

[0002] When the air conditioning heat pump system is in low-temperature heating mode, the outdoor unit condenser acts as the evaporation side, and the low-temperature liquid refrigerant absorbs heat, causing the moisture in the air to continuously condense on the air conditioning fins, forming a frost layer, which in turn has an adverse effect on the heat exchange effect of the air conditioning.

[0003] Currently, a four-way valve reversing defrost method is commonly used to address the frost problem that occurs in low-temperature heating mode in air conditioning heat pump systems. Specifically, the four-way valve is switched, causing the outdoor unit, which originally served as the evaporating side, to become the condensing side, using the heat from the high-temperature refrigerant to melt the frost on the fins. However, during the four-way valve reversal process, the air conditioner's operating mode must be switched from heating to cooling, affecting the indoor heating effect and user experience.

[0004] Therefore, how to effectively defrost the air-conditioning system while reducing the impact on the indoor heating effect is a problem that urgently needs to be solved. Summary of the Invention

[0005] The main purpose of this application is to provide a defrost control method, device, control equipment and computer storage medium, aiming to reduce the impact on indoor heating effect on the basis of effective defrosting of the air-conditioning system.

[0006] To achieve the above objectives, the present application provides a defrost control method, which includes:

[0007] When the target air conditioner meets the light frost quick melting condition, obtaining an average frequency of the compressor of the target air conditioner within a first preset time period;

[0008] determining a target frequency based on the average frequency and a preset safe frequency range, wherein the target frequency is within the safe frequency range;

[0009] The compressor is controlled to operate based on the target frequency, and a bypass circuit of the target air conditioner is controlled to be open, so that part of the high-temperature refrigerant released by the compressor flows back from the bypass circuit to the outdoor heat exchanger of the target air conditioner for defrosting.

[0010] In one embodiment, the method further comprises:

[0011] Acquire a real-time outdoor temperature, a real-time indoor temperature, a first rated capacity of an indoor heat exchanger in operation in the target air conditioner, and a second rated capacity of the outdoor heat exchanger;

[0012] When the real-time indoor temperature is greater than or equal to a first preset temperature corresponding to the real-time outdoor temperature, and the ratio between the first rated capacity and the second rated capacity is less than or equal to a preset ratio, obtaining the current heating duration of the target air conditioner, the real-time windshield temperature, and the real-time coil temperature of the indoor heat exchanger, wherein the current heating duration refers to the duration of continuous heating after the last defrost is completed;

[0013] determining a coil decay temperature difference of the indoor heat exchanger;

[0014] Based on the real-time outdoor temperature, the current heating duration, the real-time windshield, the real-time coil temperature, and the coil attenuation temperature difference, it is determined whether the target air conditioner meets the light frost quick melting condition.

[0015] In one embodiment, the step of determining the coil decay temperature difference of the indoor heat exchanger includes:

[0016] Determining a minimum coil temperature of the target air conditioner within a preset period of time after the target air conditioner enters a heating mode;

[0017] determining a first difference between the minimum coil temperature and the real-time coil temperature;

[0018] A correction coefficient for the first difference is determined, and a second difference between the first difference and the correction coefficient is used as a coil decay temperature difference of the indoor heat exchanger.

[0019] In one embodiment, the step of determining a correction coefficient for the first difference includes:

[0020] determining a target outdoor temperature at a time corresponding to the minimum coil temperature;

[0021] A third difference between the target outdoor temperature and the real-time outdoor temperature is determined, and a product of the third difference and a preset weight is used as a correction coefficient for the first difference.

[0022] In one embodiment, the step of determining whether the target air conditioner meets the light frost quick melting condition based on the real-time outdoor temperature, the current heating duration, the real-time windshield, and the real-time coil temperature includes:

[0023] When the real-time outdoor temperature is greater than a second preset temperature, obtaining the defrost duration of the target air conditioner during the last defrost;

[0024] Based on the defrost duration, the current heating duration, the real-time windshield, the real-time coil temperature, and the coil attenuation temperature difference, it is determined whether the target air conditioner meets the light frost quick melting condition.

[0025] In one embodiment, the step of determining whether the target air conditioner meets the light frost quick melting condition based on the defrost duration, the current heating duration, the real-time windshield temperature, the real-time coil temperature, and the coil attenuation temperature difference includes:

[0026] When the defrost time is less than the second preset time, the current heating time is greater than the third preset time, the real-time windshield is lower than the preset gear, the real-time coil temperature is less than the third preset temperature, and the coil attenuation temperature difference is within the preset attenuation range, it is determined that the target air conditioner meets the light frost quick melting condition;

[0027] When the defrost time is less than the second preset time, the current heating time is greater than the fourth preset time, the real-time windshield is lower than the preset gear and the real-time coil temperature is less than the third preset temperature, it is determined that the target air conditioner meets the thin frost quick melting condition, wherein the fourth preset time is greater than the third preset time.

[0028] In one embodiment, the upper limit of the safe frequency range is less than the high-pressure protection trigger frequency of the compressor, and the lower limit of the safe frequency range is the minimum frequency of the compressor when it meets the current heating demand;

[0029] The step of determining the target frequency based on the average frequency and a preset safe frequency range includes:

[0030] When the average frequency is less than the lower limit, the lower limit is used as the target frequency;

[0031] When the average frequency is greater than the upper limit value, taking the upper limit value as the target frequency;

[0032] When the average frequency is within a preset safety frequency range, the average frequency is used as the target frequency.

[0033] In addition, to achieve the above-mentioned purpose, the present application also provides a defrost control device, which includes:

[0034] An acquisition module, configured to acquire an average frequency of a compressor of the target air conditioner within a first preset time period when the target air conditioner meets the light frost quick melting condition;

[0035] a determination module, configured to determine a target frequency based on the average frequency and a preset safe frequency range, wherein the target frequency is within the safe frequency range;

[0036] A control module is used to control the operation of the compressor based on the target frequency and control the bypass circuit of the target air conditioner to be turned on so that part of the high-temperature refrigerant released by the compressor flows back from the bypass circuit to the outdoor heat exchanger of the target air conditioner for defrosting.

[0037] In addition, to achieve the above-mentioned purpose, the present application also provides a control device, which includes a memory, a processor, and a defrost control program stored in the memory and runnable on the processor. When the automatic control program is executed by the processor, the steps of the defrost control method described above are implemented.

[0038] In addition, to achieve the above-mentioned purpose, the present application also provides a computer storage medium, which stores a defrost control program that can be run on a processor, and the running program is called by the processor to implement the steps of the defrost control method described above.

[0039] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, including a computer program, which implements the steps of the above-mentioned defrost control method when executed by a processor.

[0040] The present application provides a defrost control method, which obtains the average frequency of the compressor of the target air conditioner within a first preset time period when the target air conditioner meets the thin frost quick melting condition; determines the target frequency based on the average frequency and a preset safe frequency range, and the target frequency is within the safe frequency range; controls the operation of the compressor based on the target frequency, and controls the conduction of the bypass circuit of the target air conditioner, so that part of the high-temperature refrigerant released by the compressor flows back from the bypass circuit to the outdoor heat exchanger of the target air conditioner to melt the frost layer on the fins of the outdoor heat exchanger.

[0041] In summary, the present application controls the operation of the compressor based on a target frequency within a preset safe frequency range when the target air conditioner meets the thin frost quick melting conditions, and controls the bypass circuit of the target air conditioner to be conductive, so that part of the high-temperature refrigerant released by the compressor can flow from the bypass circuit to the outdoor heat exchanger of the target air conditioner to melt the frost layer on the fins of the outdoor heat exchanger. In this way, compared with the traditional method of switching the air conditioner working mode from heating to cooling, the present application can achieve defrosting of the outdoor heat exchanger on the basis of continuous heating, that is, on the basis of effectively defrosting the air conditioning system, reduce the adverse effects on the indoor heating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0043] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0044] Figure 1 This is a flow chart of the defrost control method according to an embodiment of the present application;

[0045] Figure 2 This is a schematic diagram of the structure of a multi-split air conditioning system according to the defrost control method of an embodiment of the present application;

[0046] Figure 3 This is a schematic diagram of the defrost control process of the defrost control method according to an embodiment of the present application;

[0047] Figure 4 This is a schematic diagram of the module structure of the defrost control device according to an embodiment of the present application;

[0048] Figure 5 This is a schematic diagram of the structure of the hardware operating environment involved in the embodiments of the present application.

[0049] Description of Figure Numbers:

[0050] 01. Compressor; 02. Steam separator; 03. Oil separator; 04. Four-way valve; 05. Condenser; K1. Electronic expansion valve; T. Temperature sensing bulb; K2. Solenoid valve; 06. Auxiliary capillary tube; 07. Plate exchanger; 08. Liquid side pipe; 09. Steam side pipe.

[0051] The purpose, features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0052] It should be understood that the specific embodiments described herein are merely used to explain the technical solutions of the present application and are not intended to limit the present application.

[0053] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0054] Currently, a four-way valve reversing defrost method is commonly used to address the frost problem that occurs in low-temperature heating mode in air conditioning heat pump systems. Specifically, the four-way valve is switched, causing the outdoor unit, which originally served as the evaporating side, to become the condensing side, using the heat from the high-temperature refrigerant to melt the frost on the fins. However, during the four-way valve reversal process, the air conditioner's operating mode must be switched from heating to cooling, affecting the indoor heating effect and user experience.

[0055] Therefore, how to effectively defrost the air-conditioning system while reducing the impact on the indoor heating effect is a problem that urgently needs to be solved.

[0056] The main solution of the present application is: when the target air conditioner meets the thin frost quick melting conditions, the average frequency of the compressor of the target air conditioner within a first preset time period is obtained; the target frequency is determined based on the average frequency and a preset safety frequency range, wherein the target frequency is within the safety frequency range; the operation of the compressor is controlled based on the target frequency, and the bypass circuit of the target air conditioner is controlled to be connected, so that part of the high-temperature refrigerant released by the compressor flows back from the bypass circuit to the outdoor heat exchanger of the target air conditioner for defrosting.

[0057] This application controls the operation of the compressor based on a target frequency within a preset safe frequency range, and controls the bypass circuit of the target air conditioner, so that part of the high-temperature refrigerant released by the compressor can flow from the bypass circuit to the outdoor heat exchanger of the target air conditioner to melt the frost on the fins of the outdoor heat exchanger, provided that the target air conditioner meets the conditions for quick frost melting. In this way, compared with the traditional method of switching the air conditioner operating mode from heating to cooling, this application can achieve defrosting of the outdoor heat exchanger on the basis of continuous heating, that is, on the basis of effectively defrosting the air conditioner system, reduce the adverse effects on the indoor heating effect.

[0058] The execution subject of this embodiment may be a control device, which may be an air conditioning device such as an air conditioner, or a control terminal for controlling the air conditioner, and this embodiment does not specifically limit this. The air conditioning device refers to a device that processes the air in the workspace to maintain the set temperature and humidity in the workspace and to control the dust and harmful gas content in the workspace, and the air conditioning device is provided with an oil return bypass circuit or a hot gas bypass circuit. The air conditioning device may be an air conditioner, an air dehumidifier, an air humidifier, etc., and this embodiment does not specifically limit this. The following describes this embodiment and the following embodiments, taking the control device as the execution subject as an example.

[0059] Based on this, this application proposes a defrost control method of the first embodiment, please refer to Figure 1 The defrost control method includes steps S10 to S30:

[0060] Step S10: when the target air conditioner meets the light frost quick melting condition, obtaining the average frequency of the compressor of the target air conditioner within a first preset time period;

[0061] It should be noted that the monitored air conditioner is referred to as the target air conditioner. This embodiment of the application addresses the situation where light frost appears on the fins of the air conditioner's outdoor unit. Therefore, it is first determined whether the target air conditioner meets the preset light frost rapid melting conditions. A preset duration for acquiring the compressor frequency (hereinafter referred to as the first preset duration for clarity) is set. This embodiment of the application does not specify the specific length of the first preset duration; the first preset duration can be set to 15 seconds.

[0062] When the target air conditioner meets the preset thin frost quick melting conditions, the frequency of the compressor of the target air conditioner within the first preset time length is obtained, and the average value of multiple frequencies obtained within the first preset time length is determined (hereinafter referred to as average frequency for distinction).

[0063] Step S20, determining a target frequency based on the average frequency and a preset safe frequency range, wherein the target frequency is within the safe frequency range;

[0064] It should be noted that a frequency range for normal operation of the compressor (hereinafter referred to as a safe frequency range for distinction) is preset.

[0065] A target frequency is determined based on the average frequency and a preset safe frequency range, and the target frequency is within the safe frequency range.

[0066] In step S30, the compressor is controlled to operate based on the target frequency, and the bypass circuit of the target air conditioner is controlled to be open, so that part of the high-temperature refrigerant released by the compressor flows back from the bypass circuit to the outdoor heat exchanger of the target air conditioner for defrosting.

[0067] It should be noted that the target air conditioner includes an oil return bypass circuit. When the oil return bypass circuit is turned on, part of the high-temperature and high-pressure refrigerant released by the compressor in the air conditioner heating mode will flow back to the air conditioner's outdoor heat exchanger from the bypass circuit to melt the frost layer on the outdoor heat exchanger fins, thereby achieving effective defrosting on the basis of continuous operation in the heating mode.

[0068] The compressor is controlled to operate based on the target frequency, and the valve on the bypass circuit of the target air conditioner is controlled to open, thereby opening the bypass circuit. This allows some of the high-temperature refrigerant released by the compressor to flow through the bypass circuit to the outdoor unit of the target air conditioner. After the defrost cycle is completed, the compressor is controlled to operate at the initial frequency before entering the defrost cycle, and the bypass circuit is controlled to be blocked, and normal heating mode is resumed. Specifically, the defrost cycle can be determined to be complete after a preset duration of continuous defrost.

[0069] For example, the target air conditioner is a multi-split air conditioner system. Figure 2 , Figure 2This is a schematic diagram of the structure of a multi-split air conditioning system. The system includes compressor 01, vapor separator 02 (gas-liquid separator), oil separator 03 (oil separator), four-way valve 04, condenser 05, electronic expansion valve K1, temperature sensor T, solenoid valve K2, auxiliary capillary tube 06, plate exchanger 07, liquid-side pipe 08, and vapor-side pipe 09. Compressor 01 is connected to vapor separator 02 and oil separator 03 via pipes. It draws in low-temperature, low-pressure refrigerant vapor, compresses it into high-temperature, high-pressure vapor, and discharges it. Vapor separator 02 is connected to the intake port of compressor 01 and separates liquid refrigerant from the refrigerant vapor to prevent liquid refrigerant from entering compressor 01 and causing damage. Oil separator 03, installed at the discharge port of compressor 01, separates lubricating oil carried by the compressed refrigerant vapor and returns it to compressor 01 to ensure lubrication. The separated refrigerant vapor then enters the subsequent process. Four-way valve 04, connected to compressor 01, condenser 05, and other components via pipes, changes the refrigerant flow direction, enabling switching between cooling and heating modes. During cooling, the exhaust gas from compressor 01 is directed to condenser 05; during heating, the flow direction is changed so that the exhaust gas from compressor 01 enters the indoor unit heat exchanger first; condenser 05 is connected to four-way valve 04 and electronic expansion valve K1, where high-temperature and high-pressure refrigerant vapor releases heat and condenses into medium-temperature and high-pressure liquid refrigerant, which is a heat dissipation component in the refrigeration system; electronic expansion valve K1 is located between the condenser and evaporator, and adjusts the refrigerant flow rate according to the system operating status to ensure the appropriate amount of refrigerant entering the evaporator, ensuring the cooling effect and system stability; temperature sensor T is installed near the condenser and other components to sense temperature signals and feed them back to the control system for adjusting the opening of the electronic expansion valve, etc., to ensure stable system operating parameters. The temperature sensing package includes T4 temperature sensing package and T3 temperature sensing package, which are used to detect the outdoor ambient temperature T4 and the air conditioner condenser coil temperature T3 respectively; the solenoid valve K2 and the auxiliary capillary tube 06 cooperate with the electronic expansion valve K1 and other components to assist in controlling the refrigerant flow and system pressure, and optimize the system operation under different working conditions; the plate exchanger 07 is used in the system to exchange heat between the refrigerant and other media (such as air, water, etc.) to achieve the purpose of cooling or heating; the liquid side pipe 08 and the steam side pipe 09 are used to connect the various components of the system, transport gaseous and liquid refrigerants, and form a complete refrigerant circulation loop.

[0070] In this embodiment, the upper limit of the safe frequency range is less than the high-pressure protection trigger frequency of the compressor, and the lower limit of the safe frequency range is the minimum frequency of the compressor when it meets the current heating demand. Step S20 may include:

[0071] Step S201: When the average frequency is less than the lower limit, use the lower limit as the target frequency;

[0072] Step S202: If the average frequency is greater than the upper limit, use the upper limit as the target frequency;

[0073] Step S203: When the average frequency is within a preset safe frequency range, use the average frequency as a target frequency.

[0074] It should be noted that the upper limit of the preset safe frequency range is lower than the compressor's high-voltage protection trigger frequency, and the lower limit is the minimum frequency at which the compressor meets the current heating demand. In other words, when the target frequency is within the safe frequency range, the compressor can operate at the target frequency without triggering the high-voltage protection and can achieve heating. In this way, by controlling the compressor to operate at the target frequency, normal compressor operation is ensured, avoiding triggering the high-voltage protection or preventing heating from being achieved.

[0075] When the average frequency is less than the lower limit value, the lower limit value is used as the target frequency; when the average frequency is greater than the upper limit value, the upper limit value is used as the target frequency; and when the average frequency is within the safe frequency range, the average frequency is used as the target frequency.

[0076] In a feasible implementation, when it is determined that the target air conditioner meets the conditions for quick melting of thin frost, the bypass defrost A mode is entered, and the execution process includes: transition zone time DFGDTIME_ADD (15 seconds), instruction zone time DFZLTIME_ADD (15 seconds), defrost operation time DFTIMEONE_ADD (210 seconds), and after reaching the exit condition, the delay zone DFYCTIME_ADD (30 seconds) is continued to run before the defrost is ended. Among them, the heating operation control before entering the defrost mode is maintained during the transition period; the upper limit of the safety frequency range is set to DefrostMode1Fre_ADD, which is 45Hz, and the lower limit of the safety frequency range is the minimum compressor frequency during heating operation. The average value within 15 seconds before entering the command area and the frequency coefficient ModeARunFreqCoef_ADD of the thin frost A mode operation area are determined as the average frequency. The value of ModeARunFreqCoef_ADD is 0.8. The target frequency is determined based on the average frequency and the safety frequency range, and the compressor is controlled to operate at the target frequency. The control of the command area is maintained during the defrost operation stage; and the control of the command area is maintained in the delay area.

[0077] For example, Figure 3 The figure shows a schematic diagram of the defrost control process. First, the operating status and operating environment of the target air conditioner are determined, and based on the operating status and operating environment, it is judged whether the target air conditioner meets the thin frost quick melting conditions; if so, the average frequency of the compressor of the target air conditioner within the first preset time period is obtained; the target frequency is determined based on the average frequency and the preset safe frequency range; the compressor operation is controlled based on the target frequency, and the bypass circuit of the target air conditioner is controlled to be turned on until the defrost is completed.

[0078] In the embodiment of the present application, when the target air conditioner meets the thin frost rapid melting conditions, the compressor is controlled to operate based on a target frequency within a preset safe frequency range, and the bypass circuit of the target air conditioner is controlled to be conductive, so that part of the high-temperature refrigerant released by the compressor can flow through the bypass circuit to the outdoor heat exchanger of the target air conditioner to melt the frost layer on the fins of the outdoor heat exchanger. In this way, compared with the traditional method of switching the air conditioner operating mode from heating to cooling, the embodiment of the present application can achieve defrosting of the outdoor heat exchanger while continuing to heat. That is, on the basis of effectively defrosting the air conditioning system, the adverse effects on the indoor heating effect are reduced.

[0079] Based on the above first embodiment, a second embodiment of the defrost control method of the present application is proposed. In the second embodiment, the defrost control method further includes:

[0080] Step A10, obtaining a real-time outdoor temperature, a real-time indoor temperature, a first rated capacity of an indoor heat exchanger in operation in the target air conditioner, and a second rated capacity of the outdoor heat exchanger;

[0081] It should be noted that the real-time outdoor temperature is detected by the T4 temperature sensor in the air-conditioning system, and the indoor temperature sensor ( Figure 2 (not shown) detects the real-time indoor temperature. The operating indoor heat exchangers in the target air conditioner are identified, the rated capacities of the operating indoor heat exchangers are obtained, these rated capacities are summed to obtain a first rated capacity, and the rated capacity of the outdoor heat exchanger (hereinafter referred to as the second rated capacity for distinction) is obtained.

[0082] Step A20: When the real-time indoor temperature is greater than or equal to a first preset temperature corresponding to the real-time outdoor temperature, and the ratio between the first rated capacity and the second rated capacity is less than or equal to a preset ratio, obtaining the current heating duration of the target air conditioner, the real-time windshield temperature, and the real-time coil temperature of the indoor heat exchanger, wherein the current heating duration refers to the duration of continuous heating after the last defrost cycle.

[0083] It should be noted that the real-time coil temperature of the indoor heat exchanger is detected by the T3 temperature sensor. A mapping relationship between the outdoor temperature and the first preset temperature is pre-established. For example, when the outdoor temperature is between -6 degrees Celsius and -2 degrees Celsius, the first preset temperature is 20 degrees Celsius; when the outdoor temperature is between -2 degrees Celsius and 1 degree Celsius, the first preset temperature is 18 degrees Celsius; when the outdoor temperature is greater than or equal to 1 degree Celsius, the first preset temperature is 15 degrees Celsius.

[0084] After obtaining the real-time outdoor temperature, real-time indoor temperature, first rated capacity, and second rated capacity, the real-time outdoor temperature is determined to correspond to a preset temperature threshold (hereinafter referred to as the first preset temperature for clarity), and the ratio between the first rated capacity and the second rated capacity is determined. It is then determined whether the real-time indoor temperature is greater than or equal to the first preset temperature, and whether the capacity ratio is less than or equal to the preset ratio. If the real-time indoor temperature is greater than or equal to the first preset temperature and the capacity ratio is less than or equal to the preset ratio, the current heating duration, the real-time windshield temperature, and the real-time coil temperature of the indoor heat exchanger of the target air conditioner are further obtained. It should be understood that when the real-time indoor temperature is greater than or equal to the first preset temperature, it indicates that the indoor temperature is relatively high when the ambient temperature is low, thereby ensuring a defrost effect. Furthermore, the specific value of the preset ratio is not limited in this embodiment of the present application. In this embodiment, the preset ratio is 65%. When the capacity ratio is less than or equal to the preset ratio, it indicates that the total required capacity of the running indoor units is less than 65% of the capacity of the outdoor units, thereby ensuring a defrost effect.

[0085] In one feasible embodiment, the air conditioning system starts to enter heating mode, the compressor starts, and the bypass defrost determination state begins to time the heating duration. This time is not reset or incremented when the compressor is stopped. This function is used to control the entry, operation, and exit of bypass defrost modes A and B. The time is reset each time the system exits bypass defrost mode A or B, enters tangential defrost determination, completes oil return, shuts down, shuts down due to a fault, or switches to a non-heating mode.

[0086] Step A30, determining the coil decay temperature difference of the indoor heat exchanger;

[0087] It should be noted that the coil decay temperature difference represents the decrease in the coil temperature of the indoor heat exchanger compared to the reference temperature.

[0088] In this embodiment, step A30 may include:

[0089] Step A301, determining the minimum coil temperature of the target air conditioner within a preset period of time after the target air conditioner enters the heating mode for the first time;

[0090] It should be noted that the minimum coil temperature from the 12th minute to the 17th minute (ie, the preset time period) after the target air conditioner enters the heating mode is used as the reference temperature.

[0091] Step A302, determining a first difference between the minimum coil temperature and the real-time coil temperature;

[0092] The difference between the minimum coil temperature and the real-time coil temperature (hereinafter referred to as the first difference for distinction) is determined.

[0093] Step A303: Determine a correction coefficient for the first difference, and use a second difference between the first difference and the correction coefficient as the coil attenuation temperature difference of the indoor heat exchanger.

[0094] A correction coefficient for correcting the first difference is determined, and a difference between the first difference and the correction coefficient (hereinafter referred to as the second difference for distinction) is used as the coil decay temperature difference of the indoor heat exchanger.

[0095] In this embodiment, step A303 may include:

[0096] Step A3031, determining the target outdoor temperature at the time corresponding to the minimum coil temperature;

[0097] The time when the minimum coil temperature is obtained is determined, and the real-time outdoor temperature detected at this time is called the target outdoor temperature.

[0098] Step A3032: Determine a third difference between the target outdoor temperature and the real-time outdoor temperature, and use the product of the third difference and a preset weight as a correction coefficient for the first difference.

[0099] The difference between the target outdoor temperature and the current real-time outdoor temperature (hereinafter referred to as the third difference for distinction) is determined, and the product of the third difference and the preset weight is used as a correction coefficient for the first difference. The embodiment of the present application does not limit the specific size of the preset weight; the preset weight represents the degree of influence of the attenuation of the outdoor temperature on the attenuation of the indoor temperature.

[0100] In one embodiment, the indoor heat exchanger's coil temperature decay can be expressed as (ByPassT30 - T3) - DeltaT4, where ByPassT30 is the minimum coil temperature, T3 is the real-time coil temperature, and DeltaT4 is the correction factor for the first difference. DeltaT4 can be calculated as: (ByPassT40 - T4) * 0.9 = DeltaT4, where ByPassT40 is the target outdoor temperature, T4 is the real-time outdoor temperature, and 0.9 is a preset weight.

[0101] Step A40: determining whether the target air conditioner meets the light frost quick melting condition based on the real-time outdoor temperature, the current heating duration, the real-time windshield, the real-time coil temperature, and the coil attenuation temperature difference.

[0102] Based on the real-time outdoor temperature, the current heating duration, the real-time windshield, the real-time coil temperature and the coil attenuation temperature difference, it is determined whether the target air conditioner meets the light frost rapid melting conditions.

[0103] In this embodiment, step A40 may include:

[0104] Step A401: when the real-time outdoor temperature is greater than a second preset temperature, obtaining the defrost duration of the target air conditioner during the last defrost;

[0105] It should be noted that the embodiment of the present application does not limit the specific value of the second preset temperature. In this embodiment, the second preset temperature is set to 4 degrees Celsius.

[0106] Determine whether the real-time outdoor temperature is greater than the second preset temperature. If the real-time outdoor temperature is greater than the second preset temperature, obtain the duration of the last defrost of the target air conditioner (hereinafter referred to as defrost duration for distinction).

[0107] In one embodiment, the bypass defrost mode A cycle time is used to limit the cycle time and number of bypass defrost mode A cycles. The defrost duration is measured when the air conditioning system is turned on for heating, the compressor is started, and the system enters the bypass defrost determination state. This time is reset after a single bypass defrost mode B cycle, the system enters the defrost determination state, completes oil return, shuts down, shuts down due to a fault, or switches to a non-heating mode. If this time exceeds the set value, the system cannot enter mode A.

[0108] Step A402 : determining whether the target air conditioner meets the light frost quick melting condition based on the defrost duration, the current heating duration, the real-time windshield, the real-time coil temperature, and the coil attenuation temperature difference.

[0109] If the real-time outdoor temperature is greater than the second preset temperature, a determination is made as to whether the target air conditioner meets the light frost quick-melting condition based on the defrost duration, the current heating duration, the real-time windshield, the real-time coil temperature, and the coil attenuation temperature difference. It should be understood that if the real-time outdoor temperature is less than or equal to the second preset temperature, the previous defrost duration is not restricted.

[0110] In this embodiment, step A402 may include:

[0111] Step A4021: When the defrost duration is less than the second preset duration, the current heating duration is greater than the third preset duration, the real-time windshield is lower than the preset gear, the real-time coil temperature is less than the third preset temperature, and the coil attenuation temperature difference is within the preset attenuation range, it is determined that the target air conditioner meets the light frost quick melting condition;

[0112] It should be noted that an upper threshold for the previous defrost duration (hereinafter referred to as the second preset duration for distinction) is preset, as is a lower threshold for the current heating duration of the target air conditioner (hereinafter referred to as the third preset duration for distinction). The preset gear is set to 60%. An upper threshold for the real-time coil temperature (hereinafter referred to as the third preset temperature for distinction) is preset.

[0113] In a feasible implementation, it is determined whether the defrost time is less than the second preset time, whether the heating time is greater than the third preset time, whether the real-time windshield is lower than the preset gear, whether the real-time coil temperature is less than the third preset temperature, and whether the coil attenuation temperature difference is within the preset attenuation range. When the defrost time is less than the second preset time, the heating time is greater than the third preset time, the real-time windshield is lower than the preset gear, the real-time coil temperature is less than the third preset temperature, and the coil attenuation temperature difference is within the preset attenuation range, it is determined that the target air conditioner meets the thin frost quick melting condition and can enter the defrost mode.

[0114] In this embodiment, the prerequisite for entering the bypass defrost mode is as follows: ByPassTime > ByPassDefAMinTime_ADD, T3 < (1 + TDelay)°C, ModeATime < LoopTimeLimit_ModeA, (DFT30SUBT3ONE_ADD + DeltaT3Pay)°C ≤ (ByPassT30 - T3) - DeltaT4 < (DFT30SUBT3TWO_ADD + DeltaT3Pay)°C and the actual wind gear of all the turned-on indoor units during heating operation < 60%. Among them, ByPassTime represents the current heating duration, ByPassDefAMinTime_ADD represents the third preset duration, and the third preset duration can be set to 20 minutes; (1 + TDelay) represents the third preset temperature, and the value of TDelay is 0 or -0.5. Specifically, for the first heating operation or the normal tangential defrost mode and after the defrost ends and heating starts, if 0 < ByPassT30 + (T4 - ByPassT40) ≤ 2°C, then Tdelay = -0.5°C, otherwise the value is 0. If the previous defrost action is the bypass defrost mode A and the continuous heating duration before entering the defrost is less than or equal to HMTIMEONE_ADD, then Tdelay = -0.5°C, otherwise the value is 0, and the value of HMTIMEONE_ADD is 40 minutes. Also, after running the defrost mode B once, delay = 0°C. The difference between the defrost mode B and the defrost mode A is that the single defrost duration of the defrost mode B is longer than that of the defrost mode A, so after entering the defrost mode B once, the frost layer melts more thoroughly, so delay = 0°C is set to make the upper limit requirement for T3 lower; ModeATime is the defrost duration when entering the defrost mode A last time, and LoopTimeLimit_ModeA is the second preset duration; and the preset attenuation range is greater than or equal to [DFT30SUBT3ONE_ADD + DeltaT3Pay and less than DFT30SUBT3TWO_ADD + DeltaT3Pay, the value of DFT30SUBT3ONE_ADD + DeltaT3Pay is 0.5, and the value of DFT30SUBT3TWO_ADD + DeltaT3Pay is 4. Further, when starting up and entering the heating mode or switching to the heating mode, DeltaT3Pay is set to the initial value of 0. When the bypass defrost A mode is running, when exiting this A mode, if both T4 > 0°C and the difference between the T3 temperature when entering this defrost and the T3 temperature when exiting this defrost is greater than 9.5°C or the T3 temperature when exiting this defrost is greater than 10°C are satisfied, then DeltaT3Pay = 0.5. And when DeltaT3Pay = 0.5, after running the bypass defrost B mode or the normal tangential defrost once, DeltaT3Pay is initialized to 0.

[0115] Step A4022, when the defrost time is less than the second preset time, the current heating time is greater than the fourth preset time, the real-time windshield is lower than the preset gear and the real-time coil temperature is less than the third preset temperature, determines that the target air conditioner meets the thin frost quick melting condition, wherein the fourth preset time is greater than the third preset time.

[0116] In another feasible embodiment, it is determined whether the defrost duration is less than a second preset duration, whether the current heating duration is greater than a fourth preset duration, whether the real-time windshield is below a preset level, and whether the real-time coil temperature is less than a third preset temperature. If the defrost duration is less than the second preset duration, the current heating duration is greater than the fourth preset duration, the real-time windshield is below a preset level, and the real-time coil temperature is less than the third preset temperature, the target air conditioner is determined to meet the light frost quick melting condition and can enter defrost mode. The fourth preset duration is greater than the third preset duration and can be set to 40 minutes.

[0117] In this embodiment, the prerequisites for entering the bypass defrost mode are: ByPassTime>IntervalTimeLimit_ModeA, T3<(1+TDelay)°C, ModeATime<LoopTimeLimit_ModeA, and all internal heating units are turned on and the actual wind speed is less than 60%. Among them, IntervalTimeLimit_ModeA represents the fourth preset time length.

[0118] In this way, the embodiment of the present application sets the trigger conditions for the defrost mode. When the target air conditioner meets the trigger conditions, the target air conditioner is controlled to enter the defrost mode, thereby effectively defrosting the thin frost on the fins of the air conditioner outdoor unit, avoiding the influence of the frost layer on the heat exchange effect of the air conditioner.

[0119] The present application also provides a defrost control device, please refer to Figure 4 , the defrost control device includes:

[0120] An acquisition module 10 is configured to acquire an average frequency of a compressor of the target air conditioner within a first preset time period when the target air conditioner meets the light frost quick melting condition;

[0121] a determination module 20, configured to determine a target frequency based on the average frequency and a preset safe frequency range, wherein the target frequency is within the safe frequency range;

[0122] The control module 30 is used to control the operation of the compressor based on the target frequency and control the bypass circuit of the target air conditioner to be turned on so that part of the high-temperature refrigerant released by the compressor flows back from the bypass circuit to the outdoor heat exchanger of the target air conditioner for defrosting.

[0123] Optionally, the defrost control device further includes a judgment module, which is configured to:

[0124] Acquire a real-time outdoor temperature, a real-time indoor temperature, a first rated capacity of an indoor heat exchanger in operation in the target air conditioner, and a second rated capacity of the outdoor heat exchanger;

[0125] When the real-time indoor temperature is greater than or equal to a first preset temperature corresponding to the real-time outdoor temperature, and the ratio between the first rated capacity and the second rated capacity is less than or equal to a preset ratio, obtaining the current heating duration of the target air conditioner, the real-time windshield temperature, and the real-time coil temperature of the indoor heat exchanger, wherein the current heating duration refers to the duration of continuous heating after the last defrost is completed;

[0126] determining a coil decay temperature difference of the indoor heat exchanger;

[0127] Based on the real-time outdoor temperature, the current heating duration, the real-time windshield, the real-time coil temperature, and the coil attenuation temperature difference, it is determined whether the target air conditioner meets the light frost quick melting condition.

[0128] Optionally, the judgment module is further configured to:

[0129] Determining a minimum coil temperature of the target air conditioner within a preset period of time after the target air conditioner enters a heating mode;

[0130] determining a first difference between the minimum coil temperature and the real-time coil temperature;

[0131] A correction coefficient for the first difference is determined, and a second difference between the first difference and the correction coefficient is used as a coil decay temperature difference of the indoor heat exchanger.

[0132] Optionally, the judgment module is further configured to:

[0133] determining a target outdoor temperature at a time corresponding to the minimum coil temperature;

[0134] A third difference between the target outdoor temperature and the real-time outdoor temperature is determined, and a product of the third difference and a preset weight is used as a correction coefficient for the first difference.

[0135] Optionally, the judgment module is further configured to:

[0136] When the real-time outdoor temperature is greater than a second preset temperature, obtaining the defrost duration of the target air conditioner during the last defrost;

[0137] Based on the defrost duration, the current heating duration, the real-time windshield, the real-time coil temperature, and the coil attenuation temperature difference, it is determined whether the target air conditioner meets the light frost quick melting condition.

[0138] Optionally, the judgment module is further configured to:

[0139] When the defrost time is less than the second preset time, the current heating time is greater than the third preset time, the real-time windshield is lower than the preset gear, the real-time coil temperature is less than the third preset temperature, and the coil attenuation temperature difference is within the preset attenuation range, it is determined that the target air conditioner meets the light frost quick melting condition;

[0140] When the defrost time is less than the second preset time, the current heating time is greater than the fourth preset time, the real-time windshield is lower than the preset gear and the real-time coil temperature is less than the third preset temperature, it is determined that the target air conditioner meets the thin frost quick melting condition, wherein the fourth preset time is greater than the third preset time.

[0141] Optionally, the upper limit of the safe frequency range is less than the high-pressure protection trigger frequency of the compressor, and the lower limit of the safe frequency range is the minimum frequency of the compressor when it meets the current heating demand;

[0142] The determining module 20 is further configured to:

[0143] When the average frequency is less than the lower limit, the lower limit is used as the target frequency;

[0144] When the average frequency is greater than the upper limit value, taking the upper limit value as the target frequency;

[0145] When the average frequency is within a preset safety frequency range, the average frequency is used as the target frequency.

[0146] The defrost control device provided in this application, utilizing the defrost control method of the aforementioned embodiment, can effectively defrost the air conditioning system while reducing the impact on the indoor heating effect. Compared to the prior art, the beneficial effects of the defrost control device provided in this application are the same as those of the defrost control method provided in the aforementioned embodiment. Other technical features of the defrost control device are the same as those disclosed in the aforementioned embodiment and are not further described here.

[0147] An embodiment of the present application also provides a control device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the defrost control method in the above embodiment.

[0148] Reference below Figure 5 , which shows a schematic diagram of the structure of a control device suitable for implementing the embodiments of the present application. The control device in the embodiments of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), in-vehicle terminals (such as in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 5 The control device shown is merely an example and should not limit the functions and scope of use of the embodiments of the present application.

[0149] like Figure 5 As shown, the control device may include a processing device 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory 1002 or a program loaded from a storage device 1003 into a random access memory 1004. The random access memory 1004 also stores various programs and data required for the operation of the control device. The processing device 1001, the read-only memory 1002, and the random access memory 1004 are interconnected via a bus 1005. An input / output interface 1006 is also connected to the bus. Typically, the following systems may be connected to the input / output interface 1006: an input device 1007 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape or a hard disk; and a communication device 1009. The communication device 1009 may allow the control device to communicate with other devices wirelessly or wired to exchange data. Although the figures show a control device with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems may be implemented or have instead.

[0150] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program comprising program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via a communication device, or installed from a storage device 1003, or installed from a read-only memory 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are performed.

[0151] The control device provided in the embodiments of the present application, utilizing the defrost control method of the aforementioned embodiments, can effectively defrost the air conditioning system while reducing the impact on the indoor heating effect. Compared to the prior art, the beneficial effects of the control device provided in the embodiments of the present application are the same as those of the defrost control method provided in the aforementioned embodiments. Other technical features of the control device are the same as those disclosed in the aforementioned embodiments and are not further described here.

[0152] It should be understood that the various parts of the embodiments of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any appropriate manner in any one or more embodiments or examples.

[0153] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

[0154] An embodiment of the present application also provides a computer storage medium storing an operating program of a smart home system that can be run on a processor, and computer-readable program instructions are used to execute the defrost control method in the above embodiment.

[0155] The computer storage medium provided in the embodiment of the present application can be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination thereof. More specific examples of computer storage media can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this embodiment, the computer storage medium can be any tangible medium that contains or stores a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the computer storage medium can be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0156] The computer storage medium may be included in the control device, or may exist independently without being assembled into the control device.

[0157] The above-mentioned computer storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the control device, the control device: obtains the average frequency of the compressor of the target air conditioner within a first preset time period when the target air conditioner meets the thin frost quick melting condition; determines the target frequency based on the average frequency and a preset safety frequency range, wherein the target frequency is within the safety frequency range; controls the operation of the compressor based on the target frequency, and controls the bypass circuit of the target air conditioner to be connected, so that part of the high-temperature refrigerant released by the compressor flows back from the bypass circuit to the outdoor heat exchanger of the target air conditioner for defrosting.

[0158] Computer program code for performing the operations of the present disclosure may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on the remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0159] The flow charts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, program segment or a part of code, and the module, program segment or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented by a dedicated hardware-based system that performs the specified function or operation, or can be implemented by a combination of dedicated hardware and computer instructions.

[0160] The modules described in the embodiments of the present application may be implemented in software or hardware, wherein the name of a module does not necessarily limit the unit itself.

[0161] The readable storage medium provided in the embodiments of the present application is a computer storage medium, which stores computer-readable program instructions for executing the defrost control method described above. This computer storage medium effectively defrosts the air conditioning system while reducing the impact on indoor heating. Compared to the prior art, the beneficial effects of the computer storage medium provided in the embodiments of the present application are the same as those of the defrost control method provided in the embodiments described above, and are not further elaborated here.

[0162] An embodiment of the present application further provides a computer program product, including a computer program, which implements the steps of the above-mentioned defrost control method when executed by a processor.

[0163] The computer program product provided in the embodiments of the present application can effectively defrost an air conditioning system while reducing the impact on indoor heating. Compared to the prior art, the beneficial effects of the computer program product provided in the embodiments of the present application are the same as those of the defrost control method provided in the above embodiments, and will not be further elaborated here.

[0164] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent processing scope of the present application.

Claims

1. A defrost control method, characterized in that: The defrost control method comprises: When the target air conditioner meets the light frost quick melting condition, obtaining an average frequency of the compressor of the target air conditioner within a first preset time period; determining a target frequency based on the average frequency and a preset safe frequency range, wherein the target frequency is within the safe frequency range; The compressor is controlled to operate based on the target frequency, and a bypass circuit of the target air conditioner is controlled to be open, so that part of the high-temperature refrigerant released by the compressor flows back from the bypass circuit to the outdoor heat exchanger of the target air conditioner for defrosting.

2. The method according to claim 1, wherein The method further comprises: Acquire a real-time outdoor temperature, a real-time indoor temperature, a first rated capacity of an indoor heat exchanger in operation in the target air conditioner, and a second rated capacity of the outdoor heat exchanger; When the real-time indoor temperature is greater than or equal to a first preset temperature corresponding to the real-time outdoor temperature, and the ratio between the first rated capacity and the second rated capacity is less than or equal to a preset ratio, obtaining the current heating duration of the target air conditioner, the real-time windshield temperature, and the real-time coil temperature of the indoor heat exchanger, wherein the current heating duration refers to the duration of continuous heating after the last defrost is completed; determining a coil decay temperature difference of the indoor heat exchanger; Whether the target air conditioner meets the light frost quick melting condition is determined based on the real-time outdoor temperature, the current heating duration, the real-time windshield, the real-time coil temperature, and the coil attenuation temperature difference.

3. The method according to claim 2, wherein The step of determining the coil decay temperature difference of the indoor heat exchanger comprises: Determining a minimum coil temperature of the target air conditioner within a preset period of time after the target air conditioner enters a heating mode; determining a first difference between the minimum coil temperature and the real-time coil temperature; A correction coefficient for the first difference is determined, and a second difference between the first difference and the correction coefficient is used as a coil decay temperature difference of the indoor heat exchanger.

4. The method according to claim 3, wherein The step of determining the correction coefficient of the first difference includes: determining a target outdoor temperature at a time corresponding to the minimum coil temperature; A third difference between the target outdoor temperature and the real-time outdoor temperature is determined, and a product of the third difference and a preset weight is used as a correction coefficient for the first difference.

5. The method according to claim 2, wherein The step of determining whether the target air conditioner meets the light frost quick melting condition based on the real-time outdoor temperature, the current heating duration, the real-time windshield, and the real-time coil temperature includes: When the real-time outdoor temperature is greater than a second preset temperature, obtaining the defrost duration of the target air conditioner during the last defrost; Based on the defrost duration, the current heating duration, the real-time windshield, the real-time coil temperature, and the coil attenuation temperature difference, it is determined whether the target air conditioner meets the light frost quick melting condition.

6. The method according to claim 5, wherein The step of determining whether the target air conditioner meets the light frost quick melting condition based on the defrost duration, the current heating duration, the real-time windshield, the real-time coil temperature, and the coil attenuation temperature difference includes: When the defrost time is less than the second preset time, the current heating time is greater than the third preset time, the real-time windshield is lower than the preset gear, the real-time coil temperature is less than the third preset temperature, and the coil attenuation temperature difference is within the preset attenuation range, it is determined that the target air conditioner meets the light frost quick melting condition; When the defrost time is less than the second preset time, the current heating time is greater than the fourth preset time, the real-time windshield is lower than the preset gear and the real-time coil temperature is less than the third preset temperature, it is determined that the target air conditioner meets the thin frost quick melting condition, wherein the fourth preset time is greater than the third preset time.

7. The method according to any one of claims 1 to 6, characterized in that The upper limit of the safety frequency range is less than the high-pressure protection trigger frequency of the compressor, and the lower limit of the safety frequency range is the minimum frequency of the compressor when it meets the current heating demand; The step of determining the target frequency based on the average frequency and a preset safe frequency range includes: When the average frequency is less than the lower limit, the lower limit is used as the target frequency; When the average frequency is greater than the upper limit value, taking the upper limit value as the target frequency; When the average frequency is within a preset safety frequency range, the average frequency is used as the target frequency.

8. A defrost control device, characterized in that: The defrost control device comprises: An acquisition module, configured to acquire an average frequency of a compressor of the target air conditioner within a first preset time period when the target air conditioner meets the light frost quick melting condition; a determination module, configured to determine a target frequency based on the average frequency and a preset safe frequency range, wherein the target frequency is within the safe frequency range; A control module is used to control the operation of the compressor based on the target frequency and control the bypass circuit of the target air conditioner to be turned on so that part of the high-temperature refrigerant released by the compressor flows back from the bypass circuit to the outdoor heat exchanger of the target air conditioner for defrosting.

9. A control device, characterized in that: The method comprises a memory, a processor, and a defrost control program stored in the memory and executable on the processor, wherein the defrost control program implements the steps of the defrost control method according to any one of claims 1 to 7 when executed by the processor.

10. A computer storage medium, characterized in that A defrost control program that can be run on a processor is stored, and the defrost control program is called by the processor to implement the steps of the defrost control method according to any one of claims 1 to 7.

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