A control method and device of a refrigerator, the refrigerator, a storage medium and a program product

Abstract

The application discloses a refrigerator control method and device, a refrigerator, a storage medium and a computer program product. The refrigerator comprises a chamber and an evaporator. The method comprises: acquiring a first operating parameter when the refrigerator is not in a refrigeration state; acquiring the first operating parameter and a second operating parameter when the refrigerator is in the refrigeration state; determining an estimated frosting amount of the evaporator according to the first operating parameter, and determining a water vapor reduction amount of the chamber according to the second operating parameter; determining whether the evaporator needs defrosting according to the estimated frosting amount and the water vapor reduction amount; and controlling the refrigerator to execute a preset defrosting mode if it is determined that the evaporator needs defrosting. According to the scheme, whether defrosting is performed is determined according to the estimated frosting amount of the evaporator and the water vapor reduction amount of the chamber, so that the interval time of defrosting is dynamically adjusted, the accuracy of defrosting opportunity judgment is improved, defrosting is avoided from being too early or not timely, system energy consumption is reduced, and the system energy efficiency ratio is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of refrigerators, and particularly relates to a control method and device for a refrigerator, a refrigerator, a storage medium and a computer program product, in particular to a control method and device for defrosting intervals of a refrigerator, a refrigerator, a storage medium and a computer program product. BACKGROUND

[0002] As a device for phase change heat absorption of refrigerant in a refrigerator, the evaporator often maintains a low temperature during use. In the refrigerator, the evaporator increases the cold capacity of the freezer compartment, and the temperature of the freezer compartment is low, for example, the freezing temperature of a certain refrigerator can reach-38℃, that is, the temperature of the evaporator needs to be ensured below-38℃. When the air in the refrigerator flows through the evaporator and exchanges heat, the water vapor in the air is liquefied and frozen on the surface of the evaporator, and more and more frost will be attached to the evaporator after a long time, which weakens the heat exchange efficiency between the air and the evaporator. The consequence is that the temperature of the evaporator gradually decreases, but the temperature in the refrigerator rises, and the liquid refrigerant cannot be effectively evaporated after passing through the evaporator, and the refrigerant gradually accumulates in the liquid storage tank, which may cause liquid strike of the compressor.

[0003] Therefore, defrosting needs to be performed in time after the evaporator is frosted, and the related scheme is to start defrosting of the refrigerator after a fixed time interval. Since this defrosting method cannot predict the frosting amount of the evaporator, the defrosting may not be in time, which leads to weakening of the refrigeration capacity of the refrigerator.

[0004] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0005] The present application aims to provide a control method and device for a refrigerator, a refrigerator, a storage medium and a computer program product, to solve the problem that the refrigerator cannot defrost in time according to the frosting amount of the evaporator in the related scheme, which leads to weakening of the refrigeration capacity of the refrigerator, to determine whether to defrost according to the estimated frosting amount of the evaporator and the water vapor reduction amount of the chamber, so as to dynamically adjust the defrosting interval, improve the accuracy of defrosting opportunity judgment, avoid early defrosting or late defrosting, reduce system energy consumption, and improve the system energy efficiency ratio.

[0006] The application provides a control method of a refrigerator, the refrigerator comprising a chamber and an evaporator; the evaporator is used for delivering cold quantity to the chamber; the method comprises: acquiring a first running parameter when the refrigerator is not in a refrigeration state; acquiring the first running parameter and a second running parameter when the refrigerator is in the refrigeration state; determining an estimated frosting amount of the evaporator according to the first running parameter, and determining a water vapor reduction amount of the chamber according to the second running parameter; determining whether the evaporator needs defrosting according to the estimated frosting amount and the water vapor reduction amount; and if it is determined that the evaporator needs defrosting, controlling the refrigerator to execute a preset defrosting mode.

[0007] In some embodiments, the refrigerator further comprises a compressor and a fan; the fan is used for adjusting the air circulation speed between the chamber and the evaporator; the first running parameter comprises the rotating speed of the compressor, the rotating speed of the fan and the temperature of the evaporator; determining the estimated frosting amount of the evaporator according to the first running parameter comprises calculating the estimated frosting amount according to a preset first formula; the preset first formula is:

[0008] Wr=∫k4*(k1+k2+k3)d(t);

[0009] wherein, Wr is the estimated frosting amount; k1, k2, k3 and k4 are all preset parameters; the greater the rotating speed of the compressor is, the greater k1 is; the greater the rotating speed of the fan is, the greater k2 is; the smaller the temperature of the evaporator is, the greater k4 is.

[0010] In some embodiments, the chamber has an air outlet and an air return; the second running parameter comprises the rotating speed of the fan, the temperature and relative humidity at the air outlet, and the temperature and relative humidity at the air return; determining the water vapor reduction amount of the chamber according to the second running parameter comprises: calculating the air flow at the air outlet according to the second running parameter and a preset second formula; calculating the absolute humidity at the air outlet and the absolute humidity at the air return according to the second running parameter and a preset third formula; and calculating the water vapor reduction amount according to the air flow and absolute humidity at the air outlet, the absolute humidity at the air return, and a preset fourth formula.

[0011] In some embodiments, the preset second formula is:

[0012] L=S*R*f;

[0013] wherein, L is the air flow at the air outlet; S is the sectional area of the damper opening degree of the chamber; R is the rotating speed of the fan; and f is a preset parameter.

[0014] The preset third formula is:

[0015]

[0016] wherein, in the calculation of the absolute humidity at the air outlet, p is the absolute humidity at the air outlet, T is the temperature at the air outlet, RH is the relative humidity at the air outlet; in the calculation of the absolute humidity at the return air outlet, p is the absolute humidity at the return air outlet, T is the temperature at the return air outlet, RH is the relative humidity at the return air outlet; a, b, c, m, Tn, A are all constants;

[0017] The preset fourth formula is:

[0018] Ws(t)=∫(ρ0-ρ1)*L*d(t);

[0019] wherein, Ws is the water vapor reduction amount; p0 is the absolute humidity at the air outlet; p1 is the absolute humidity at the return air outlet; L is the air flow at the air outlet.

[0020] In some embodiments, determining whether the evaporator needs defrosting according to the estimated frost amount and the water vapor reduction amount comprises: determining a total frost amount as a sum of the estimated frost amount and the water vapor reduction amount, judging a size relationship between the total frost amount and a preset threshold; if the total frost amount is greater than the preset threshold, determining that the evaporator needs defrosting; if the total frost amount is less than or equal to the preset threshold, determining that the evaporator does not need defrosting.

[0021] To match the above method, another aspect of the present application provides a control device of a refrigerator, the refrigerator comprising a chamber and an evaporator; the evaporator is used to deliver cold quantity to the chamber; the device comprises: an acquisition unit configured to acquire a first operating parameter when the refrigerator is not in a refrigeration state; acquire a first operating parameter and a second operating parameter when the refrigerator is in a refrigeration state; a control unit configured to determine an estimated frost amount of the evaporator according to the first operating parameter, and determine a water vapor reduction amount of the chamber according to the second operating parameter; the control unit is further configured to determine whether the evaporator needs defrosting according to the estimated frost amount and the water vapor reduction amount; the control unit is further configured to control the refrigerator to execute a preset defrosting mode if it is determined that the evaporator needs defrosting.

[0022] In some embodiments, the refrigerator further comprises a compressor and a fan; the fan is configured to adjust the air circulation speed between the chamber and the evaporator; the first operating parameter comprises the rotation speed of the compressor, the rotation speed of the fan, and the temperature of the evaporator; the control unit is configured to determine the estimated frost amount of the evaporator according to the first operating parameter, comprising: calculating the estimated frost amount according to a preset first formula; the preset first formula is:

[0023] Wr = ∫k4*(k1+k2+k3)d(t);

[0024] wherein, Wr is the estimated frost amount; k1, k2, k3, and k4 are all preset parameters; the greater the rotation speed of the compressor, the greater k1; the greater the rotation speed of the fan, the greater k2; the smaller the temperature of the evaporator, the greater k4.

[0025] In some embodiments, the chamber has an air outlet and an air return; the second operating parameter comprises the rotation speed of the fan, the temperature and relative humidity at the air outlet, and the temperature and relative humidity at the air return; the control unit is configured to determine the water vapor reduction amount of the chamber according to the second operating parameter, comprising: calculating the air flow at the air outlet according to the second operating parameter and a preset second formula; calculating the absolute humidity at the air outlet and the absolute humidity at the air return according to the second operating parameter and a preset third formula; calculating the water vapor reduction amount according to the air flow and absolute humidity at the air outlet, the absolute humidity at the air return, and a preset fourth formula.

[0026] In some embodiments, the preset second formula is:

[0027] L = S*R*f;

[0028] wherein, L is the air flow at the air outlet; S is the cross-sectional area of the damper opening degree of the chamber; R is the rotation speed of the fan; and f is a preset parameter;

[0029] The preset third formula is:

[0030]

[0031] wherein, in calculating the absolute humidity at the air outlet, p is the absolute humidity at the air outlet, T is the temperature at the air outlet, and RH is the relative humidity at the air outlet; in calculating the absolute humidity at the air return, p is the absolute humidity at the air return, T is the temperature at the air return, and RH is the relative humidity at the air return; a, b, c, m, Tn, and A are all constants;

[0032] The preset fourth formula is:

[0033] Ws(t) = ∫(p0-p1)*L*d(t);

[0034] wherein, Ws is the water vapor reduction amount; p0 is the absolute humidity at the air outlet; p1 is the absolute humidity at the air return; L is the air flow at the air outlet.

[0035] In some embodiments, the control unit determines whether the evaporator needs defrosting according to the estimated frost amount and the water vapor reduction amount, including: determining a total frost amount as a sum of the estimated frost amount and the water vapor reduction amount, judging a size relationship between the total frost amount and a preset threshold; if the total frost amount is greater than the preset threshold, determining that the evaporator needs defrosting; if the total frost amount is less than or equal to the preset threshold, determining that the evaporator does not need defrosting.

[0036] In order to match the above device, the application further provides a refrigerator, including: the above-mentioned control device of the refrigerator.

[0037] In order to match the above method, the application further provides a storage medium, including a stored program, wherein when the program runs, the device where the storage medium is located executes the above-mentioned control method of the refrigerator.

[0038] In order to match the above method, the application further provides a computer program product, including a computer program, and the computer program product is processed to realize the steps of the above-mentioned control method of the refrigerator.

[0039] The scheme of the application acquires a first running parameter when the refrigerator is not in a refrigeration state, acquires the first running parameter and a second running parameter when the refrigerator is in a refrigeration state, determines an estimated frost amount of the evaporator according to the first running parameter, determines a water vapor reduction amount of the interval chamber according to the second running parameter, determines whether the evaporator needs defrosting according to the estimated frost amount and the water vapor reduction amount, and controls the refrigerator to execute a preset defrosting mode if it is determined that the evaporator needs defrosting. Thus, whether to defrost is determined according to the estimated frost amount of the evaporator and the water vapor reduction amount of the interval chamber, the interval time of defrosting is dynamically adjusted, the accuracy of the defrosting opportunity judgment is improved, the system energy consumption is reduced, and the system energy efficiency ratio is improved.

[0040] Other features and advantages of the application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application.

[0041] The technical scheme of the application will be further described in detail below with the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 Flowchart of an embodiment of a control method of a refrigerator according to the present application;

[0043] Figure 2 Structure diagram of an embodiment of a control device of a refrigerator according to the present application;

[0044] Figure 3 Structure diagram of a refrigerator;

[0045] Figure 4 Flowchart of a control method of a defrosting interval of a refrigerator according to the present application.

[0046] In combination with the accompanying drawings, the following is the meaning of the reference signs in the embodiments of the present application:

[0047] 1 - air outlet; 2 - air return; 102 - acquisition unit; 104 - control unit. DETAILED DESCRIPTION

[0048] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below in combination with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0049] According to an embodiment of the present application, a control method of a refrigerator is provided, the refrigerator comprising a chamber and an evaporator; the evaporator is used to deliver cold quantity to the chamber. The refrigerator further comprises a compressor and a fan; the fan is used to adjust the air circulation speed between the chamber and the evaporator. The chamber has an air outlet and an air return.

[0050] In the refrigeration process of the refrigerator, the compressor compresses the refrigerant into high-temperature and high-pressure gas, and then the refrigerant successively passes through the condenser and the throttling device to be cooled and decompressed, and becomes low-temperature liquid refrigerant. After that, the refrigerant exchanges heat with the air at the evaporator, so that the air is cooled. The cooled air is sent into the chamber of the refrigerator, so that the temperature in the chamber is always in a lower range. The chamber can comprise a refrigeration chamber and a freezing chamber according to different set temperatures. The temperature in the refrigeration chamber is higher than that in the freezing chamber, that is, the evaporator delivers more cold quantity to the freezing chamber.

[0051] As shown in FIG. 1, the refrigerator according to the present application comprises a chamber 1, a compressor 2, a condenser 3, a throttling device 4, an evaporator 5, a fan 6 and a control device 7. Figure 3As shown, the chamber is provided with an air outlet 1 and an air return 2, the air in the chamber flows to the evaporator through the air outlet, and the air at the evaporator flows to the chamber through the air return, thereby forming air circulation, so that the evaporator continuously supplies cold to the chamber. In order to adjust the air circulation speed between the chamber and the evaporator, a fan is provided, the faster the fan speed, the faster the air circulation, and the slower the fan speed, the slower the air circulation. The temperature and relative humidity of the air are collected by the temperature and humidity sensors arranged at the air outlet and air return of the chamber.

[0052] As Figure 1 The flowchart of an embodiment of the method of the present application is shown. The control method of the refrigerator can include steps S110 to S140.

[0053] At step S110, when the refrigerator is not in a refrigeration state, a first operating parameter is obtained; when the refrigerator is in a refrigeration state, a first operating parameter and a second operating parameter are obtained.

[0054] The refrigerator is a single-system air-cooled refrigerator. When the chamber is not in a refrigeration state, i.e. the damper at the air return of the chamber is in a closed state, the estimated frosting amount of the evaporator is calculated at this time; when the chamber is in a refrigeration state, the damper is opened, and the estimated frosting amount of the evaporator and the water vapor reduction amount of the chamber are calculated at this time.

[0055] The first operating parameter includes the speed of the compressor, the speed of the fan, and the temperature of the evaporator. The second operating parameter includes the speed of the fan, the temperature and relative humidity at the air outlet, and the temperature and relative humidity at the air return.

[0056] At step S120, the estimated frosting amount of the evaporator is determined according to the first operating parameter, and the water vapor reduction amount of the chamber is determined according to the second operating parameter.

[0057] In some embodiments, in step S120, determining the estimated frosting amount of the evaporator according to the first operating parameter includes calculating the estimated frosting amount according to a preset first formula. The preset first formula is:

[0058] Wr = ∫k4*(k1+k2+k3)d(t);

[0059] wherein Wr is the estimated frosting amount; k1, k2, k3, and k4 are all preset parameters; the greater the speed of the compressor, the greater k1; the greater the speed of the fan, the greater k2; the smaller the temperature of the evaporator, the greater k4.

[0060] When the chamber is not in a refrigeration state, the frosting amount of the evaporator is related to the speed of the compressor, the speed of the fan, the interval time from the last defrosting, and the temperature of the evaporator.

[0061] In the preset first formula, k1 is in a positive ratio with the compressor speed, for example, when the compressor speed is 1200, k1 is 0.0025, when the compressor speed is 2400, k1 is 0.0036, when the compressor speed is 3600, k1 is 0.0052, and when the compressor speed is 4800, k1 is 0.0063, wherein the unit of the compressor speed is RPM, and the unit of k1 is g / (RPM*Min).

[0062] In the preset first formula, k1 is in a positive ratio with the compressor speed, for example, when the compressor speed is 1200, k1 is 0.0025, when the compressor speed is 2400, k1 is 0.0036, when the compressor speed is 3600, k1 is 0.0052, and when the compressor speed is 4800, k1 is 0.0063, wherein the unit of the compressor speed is RPM, and the unit of k1 is g / (RPM*Min).

[0063] K3 is a coefficient of the interval time from the last defrosting, and is a fixed value.

[0064] In the preset first formula, k1 is in a positive ratio with the compressor speed, for example, when the compressor speed is 1200, k1 is 0.0025, when the compressor speed is 2400, k1 is 0.0036, when the compressor speed is 3600, k1 is 0.0052, and when the compressor speed is 4800, k1 is 0.0063, wherein the unit of the compressor speed is RPM, and the unit of k1 is g / (RPM*Min).

[0065] In some embodiments, in step S120, the specific process of determining the water vapor reduction amount of the chamber according to the second operating parameter includes steps S210 to S230.

[0066] When the chamber is being refrigerated, the air in the chamber circulates to the evaporator for cooling, and the water vapor in the air condenses into water droplets and adheres to the evaporator, and finally forms a frost layer. Therefore, the amount of frost on the evaporator can be inferred according to the water vapor reduction amount in the air. That is, the amount of frost on the evaporator is not only related to the compressor speed, the fan speed, the interval time from the last defrosting, and the evaporator temperature, but also related to the water vapor content in the air.

[0067] During the refrigeration of the chamber by the evaporator, the air in the chamber flows from the air outlet to the evaporator, and then flows back to the chamber from the air return. Therefore, the water vapor reduction amount in the air can be calculated according to the absolute humidity of the air outlet and the air return, combined with the air flow.

[0068] In step S210, the air flow at the air outlet is calculated according to the second operating parameter and a preset second formula. The preset second formula is:

[0069] L=S*R*f;

[0070] Wherein, L is the air flow at the air outlet; S is the area of the damper opening of the chamber; R is the rotating speed of the fan; f is a preset parameter, which is a compensation correction factor of the air flow.

[0071] In step S220, the absolute humidity at the air outlet and the absolute humidity at the return air outlet are calculated according to the second operating parameter and a preset third formula. The preset third formula is:

[0072]

[0073] Wherein, in the calculation of the absolute humidity at the air outlet, p is the absolute humidity at the air outlet, T is the temperature at the air outlet, and RH is the relative humidity at the air outlet; in the calculation of the absolute humidity at the return air outlet, p is the absolute humidity at the return air outlet, T is the temperature at the return air outlet, and RH is the relative humidity at the return air outlet; a, b, c, m, Tn, and A are all constants; optionally, a = 216.7, b = 273.15, c = 100, m = 17.62, Tn = 243.21, and A = 6.112.

[0074] In step S230, the water vapor reduction amount is calculated according to the air flow at the air outlet, the absolute humidity at the air outlet, the absolute humidity at the return air outlet, and a preset fourth formula. The preset fourth formula is:

[0075] Ws(t) = ∫(p0-p1)*L*d(t);

[0076] Wherein, Ws is the water vapor reduction amount, and only positive integration is accumulated, i.e., only water vapor reduction amount is accumulated, and water vapor increase is ignored; p0 is the absolute humidity at the air outlet; p1 is the absolute humidity at the return air outlet; and L is the air flow at the air outlet.

[0077] In step S130, it is determined whether the evaporator needs to be defrosted according to the estimated frost amount and the water vapor reduction amount.

[0078] Instead of directly determining the defrosting interval period, the total frost amount on the evaporator is estimated, and it is determined whether defrosting is needed according to the total frost amount. That is, the interval length between each defrosting is uncertain, so that the defrosting is more in line with the actual needs, the temperature in the chamber is prevented from fluctuating, and the power consumption of the refrigerator is reduced.

[0079] In some embodiments, in step S130, the specific process of determining whether the evaporator needs defrosting according to the estimated frost amount and the water vapor reduction amount comprises: determining a sum of the estimated frost amount and the water vapor reduction amount as a total frost amount, judging a size relationship between the total frost amount and a preset threshold value; if the total frost amount is greater than the preset threshold value, it is determined that the evaporator needs defrosting; if the total frost amount is less than or equal to the preset threshold value, it is determined that the evaporator does not need defrosting.

[0080] According to the estimated frost amount and the water vapor reduction amount, the total frost amount on the evaporator can be accurately calculated, and whether to perform defrosting is determined according to the total frost amount, so that the defrosting interval time is not limited to a fixed interval time, but is dynamically adjusted according to the total frost amount. The faster the total frost amount grows, the shorter the defrosting interval time is, and the slower the total frost amount grows, the longer the defrosting interval time is, so that the evaporator can be defrosted in time when needed, and stable and efficient operation of the system is ensured.

[0081] In step S140, if it is determined that the evaporator needs defrosting, the refrigerator is controlled to perform a preset defrosting mode. The preset defrosting mode is used to defrost the evaporator.

[0082] By calculating the estimated frost amount and the water vapor reduction amount according to the parameters during the operation of the refrigerator, the frost amount of the evaporator is estimated, the accuracy of the defrosting timing judgment is improved, the defrosting is avoided to be too early or too late, the loss caused by long-time frosting of the evaporator is reduced, the system energy consumption is reduced, and the system energy efficiency ratio is improved.

[0083] Figure 4 The flowchart of the defrosting interval control method of the refrigerator of the present application is shown in FIG. 1, which comprises: Figure 4

[0084] Step 1: judging whether the refrigeration compartment of the refrigerator is refrigerating. If the refrigeration compartment is refrigerating, the water vapor reduction amount Ws and the estimated frost amount Wr are accumulated; if the refrigeration compartment is not refrigerating, the estimated frost amount Wr is accumulated. Then the total frost amount W is accumulated, W = Ws + Wr.

[0085] Step 2: judging whether W > defrosting threshold value. If W > defrosting threshold value, enter the defrosting period, start defrosting, and clear the frost amount W. If W ≤ defrosting threshold value, execute step 1.

[0086] ​According to the technical scheme of the embodiment, the first running parameter is acquired when the refrigerator is not in the refrigeration state, the first running parameter and the second running parameter are acquired when the refrigerator is in the refrigeration state, the estimated frosting amount of the evaporator is determined according to the first running parameter, the water vapor reduction amount of the intermediate chamber is determined according to the second running parameter, whether the evaporator needs to defrost is determined according to the estimated frosting amount and the water vapor reduction amount, and the refrigerator is controlled to execute the preset defrosting mode if it is determined that the evaporator needs to defrost. Thus, whether to defrost is determined according to the estimated frosting amount of the evaporator and the water vapor reduction amount of the intermediate chamber, the interval time of defrosting is dynamically adjusted, the accuracy of the defrosting opportunity judgment is improved, the defrosting is avoided to be too early or not timely, the system energy consumption is reduced, and the system energy efficiency ratio is improved.

[0087] According to the embodiment of the present application, a control device of a refrigerator corresponding to the control method of the refrigerator is also provided. The refrigerator includes an intermediate chamber and an evaporator; the evaporator is used to deliver cold energy to the intermediate chamber. The refrigerator also includes a compressor and a fan; the fan is used to adjust the air circulation speed between the intermediate chamber and the evaporator. The intermediate chamber has an air outlet and an air return.

[0088] During the refrigeration process of the refrigerator, the compressor compresses the refrigerant into high-temperature and high-pressure gas, and then the refrigerant successively passes through the condenser and the throttling device to be cooled and decompressed into low-temperature liquid refrigerant. Then, the refrigerant exchanges heat with the air at the evaporator to cool the air, and the cooled air is sent into the intermediate chamber of the refrigerator to keep the temperature in the intermediate chamber in a relatively low range. The intermediate chamber can include a refrigeration chamber and a freezing chamber according to different set temperatures, and the temperature in the refrigeration chamber is higher than that in the freezing chamber, that is, the evaporator delivers more cold energy to the freezing chamber.

[0089] As shown in Figure 3 The air in the intermediate chamber flows to the evaporator through the air outlet, and the air at the evaporator flows to the intermediate chamber through the air return, thereby forming air circulation and enabling the evaporator to continuously supply cold energy to the intermediate chamber. In order to adjust the air circulation speed between the intermediate chamber and the evaporator, a fan is provided, and the greater the fan speed, the faster the air circulation, and the smaller the fan speed, the slower the air circulation. Temperature and humidity sensors are arranged at the air outlet and the air return of the intermediate chamber to collect the temperature and relative humidity of the air.

[0090] Referring to Figure 2 The control device of the refrigerator can include an acquisition unit 102 and a control unit 104.

[0091] The acquisition unit 102 is configured to acquire the first operating parameter when the refrigerator is not in the refrigeration state, and acquire the first operating parameter and the second operating parameter when the refrigerator is in the refrigeration state. The specific functions and processes of the acquisition unit 102 are described with reference to step S110.

[0092] The refrigerator is a single-system air-cooled refrigerator. When the compartment is not in the refrigeration state, that is, the damper at the compartment return air inlet is in the closed state, the estimated frosting amount of the evaporator is calculated at this time. When the compartment is in the refrigeration state, the damper is opened, and the estimated frosting amount of the evaporator and the water vapor reduction amount of the compartment are calculated at this time.

[0093] The first operating parameter includes the rotation speed of the compressor, the rotation speed of the fan, and the temperature of the evaporator. The second operating parameter includes the rotation speed of the fan, the temperature and relative humidity at the air outlet, and the temperature and relative humidity at the return air inlet.

[0094] The control unit 104 is configured to determine the estimated frosting amount of the evaporator according to the first operating parameter, and determine the water vapor reduction amount of the compartment according to the second operating parameter. The specific functions and processes of the control unit 104 are described with reference to step S120.

[0095] In some embodiments, the control unit 104 determines the estimated frosting amount of the evaporator according to the first operating parameter, including calculating the estimated frosting amount according to a preset first formula. The preset first formula is:

[0096] Wr = ∫k4*(k1+k2+k3)d(t);

[0097] wherein Wr is the estimated frosting amount; k1, k2, k3, and k4 are all preset parameters; the greater the rotation speed of the compressor, the greater k1; the greater the rotation speed of the fan, the greater k2; and the smaller the temperature of the evaporator, the greater k4.

[0098] When the compartment is not in the refrigeration state, the frosting amount of the evaporator is related to the rotation speed of the compressor, the rotation speed of the fan, the interval time from the last defrosting, and the temperature of the evaporator.

[0099] In the preset first formula, k1 is in a positive proportional relationship with the rotation speed of the compressor, for example, when the rotation speed of the compressor is 1200, k1 is 0.0025, when the rotation speed of the compressor is 2400, k1 is 0.0036, when the rotation speed of the compressor is 3600, k1 is 0.0052, and when the rotation speed of the compressor is 4800, k1 is 0.0063, wherein the unit of the rotation speed of the compressor is RPM, and the unit of k1 is g / (RPM*Min).

[0100] k2 is proportional to the fan speed, for example, when the fan speed is 800, k2 is 0.0013, when the fan speed is 1500, k2 is 0.0028, and when the fan speed is 2400, k2 is 0.0045, wherein the unit of the fan speed is RPM, and the unit of k2 is g / (RPM*Min).

[0101] k3 is a coefficient of the interval time from the last defrosting, and is a fixed value.

[0102] k4 is inversely proportional to the temperature of the evaporator, for example, when the evaporator temperature is in (-∞, -33), k4 is 1, when the evaporator temperature is in [-33, -18), k4 is 0.8, when the evaporator temperature is in [-18, -10), k4 is 0.7, when the evaporator temperature is in [-10, -5), k4 is 0.5, when the evaporator temperature is in [-5, 0), k4 is 0.2, and when the evaporator temperature is in [0, +∞), k4 is 0, wherein the unit of the evaporator temperature is ℃.

[0103] In some embodiments, the control unit 104 determines the specific process of the water vapor reduction amount of the chamber according to the second operating parameter, which includes:

[0104] When the chamber is refrigerated, the air in the chamber circulates to the evaporator for cooling, and the water vapor in the air condenses into water droplets and adheres to the evaporator, and finally forms a frost layer, so the amount of frost on the evaporator can be calculated according to the water vapor reduction amount in the air. That is, the amount of frost on the evaporator is not only related to the compressor speed, the fan speed, the interval time from the last defrosting, and the evaporator temperature, but also related to the water vapor content in the air.

[0105] During the refrigeration process of the chamber, the air in the chamber flows from the air outlet to the evaporator, and then flows back to the chamber from the air return, so the water vapor reduction amount in the air can be calculated according to the absolute humidity of the air outlet and the air return, combined with the air flow.

[0106] The control unit 104 is specifically configured to calculate the air flow at the air outlet according to the second operating parameter and a preset second formula. The specific functions and processes of the control unit 104 are described in step S210. The preset second formula is:

[0107] L=S*R*f;

[0108] wherein L is the air flow at the air outlet, S is the sectional area of the damper opening degree of the chamber, R is the speed of the fan, and f is a preset parameter, which is a compensation correction factor of the air flow.

[0109] The control unit 104 is further configured to calculate the absolute humidity at the air outlet and the absolute humidity at the air return according to the second operating parameter and a preset third formula. The specific function and processing of the control unit 104 can be found in step S220. The preset third formula is:

[0110]

[0111] In the calculation of the absolute humidity at the air outlet, ρ is the absolute humidity at the air outlet, T is the temperature at the air outlet, and RH is the relative humidity at the air outlet. In the calculation of the absolute humidity at the air return, ρ is the absolute humidity at the air return, T is the temperature at the air return, and RH is the relative humidity at the air return. a, b, c, m, Tn, and A are all constants. Optionally, a = 216.7, b = 273.15, c = 100, m = 17.62, Tn = 243.21, and A = 6.112.

[0112] The control unit 104 is further configured to calculate the water vapor reduction amount according to the air flow rate and the absolute humidity at the air outlet, the absolute humidity at the air return, and a preset fourth formula. The specific function and processing of the control unit 104 can be found in step S230. The preset fourth formula is:

[0113] Ws(t) = ∫(ρ0-ρ1)*L*d(t);

[0114] In the calculation of the absolute humidity at the air outlet, ρ is the absolute humidity at the air outlet, T is the temperature at the air outlet, and RH is the relative humidity at the air outlet. In the calculation of the absolute humidity at the air return, ρ is the absolute humidity at the air return, T is the temperature at the air return, and RH is the relative humidity at the air return. a, b, c, m, Tn, and A are all constants. Optionally, a = 216.7, b = 273.15, c = 100, m = 17.62, Tn = 243.21, and A = 6.112.

[0115] The control unit 104 is further configured to determine whether the evaporator needs to be defrosted according to the estimated frost amount and the water vapor reduction amount. The specific function and processing of the control unit 104 can be found in step S130.

[0116] The present scheme is not to directly determine the defrosting interval period, but to estimate the total frost amount on the evaporator, and to determine whether to defrost according to the total frost amount. That is, the interval length between each defrosting is uncertain, so that the defrosting is more in line with the current actual demand, avoiding the fluctuation of the temperature in the interval chamber and reducing the power consumption of the refrigerator.

[0117] In some embodiments, the control unit 104 determines whether the evaporator needs defrosting according to the estimated frost amount and the water vapor reduction amount, including: determining a total frost amount as a sum of the estimated frost amount and the water vapor reduction amount, determining a size relationship between the total frost amount and a preset threshold value, determining that the evaporator needs defrosting if the total frost amount is greater than the preset threshold value, and determining that the evaporator does not need defrosting if the total frost amount is less than or equal to the preset threshold value.

[0118] According to the estimated frost amount and the water vapor reduction amount, the total frost amount on the evaporator can be accurately calculated, and whether to perform defrosting is determined according to the total frost amount, so that the defrosting interval is not limited to a fixed interval, but is dynamically adjusted according to the total frost amount. The faster the total frost amount grows, the shorter the defrosting interval is, and the slower the total frost amount grows, the longer the defrosting interval is, so that the evaporator can be defrosted in time when needed, and stable and efficient operation of the system is ensured.

[0119] The control unit 104 is further configured to control the refrigerator to perform a preset defrosting mode if it is determined that the evaporator needs defrosting. The preset defrosting mode is used to defrost the evaporator. For specific functions and processing of the control unit 104, see step S140.

[0120] By calculating the estimated frost amount and the water vapor reduction amount according to the parameters during operation of the refrigerator, the frost amount of the evaporator is estimated, the accuracy of the defrosting timing is improved, and the problem of early defrosting or late defrosting is avoided, thereby reducing the loss caused by long-term frosting of the evaporator, reducing the system energy consumption, and improving the system energy efficiency ratio.

[0121] Figure 4 The flowchart of the defrosting interval control method of the refrigerator of the present application is shown in FIG. 1, which includes: Figure 4

[0122] Step 1: Determine whether the refrigerator is refrigerating. If the refrigerator is refrigerating, accumulate the water vapor reduction amount Ws and the estimated frost amount Wr; if the refrigerator is not refrigerating, accumulate the estimated frost amount Wr. Then accumulate the total frost amount W, W = Ws + Wr.

[0123] Step 2: Determine whether W > defrosting threshold value. If W > defrosting threshold value, enter the defrosting period and start defrosting, and remove the frost amount W. If W ≤ defrosting threshold value, perform step 1.

[0124] Since the processing and functions realized by the device of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, the description of the present embodiment will not be described in detail, and the relevant description in the foregoing embodiments can be referred to, which will not be described herein.

[0125] ​The technical scheme of the present application is adopted to obtain the first operation parameter when the refrigerator is not in the refrigeration state, obtain the first operation parameter and the second operation parameter when the refrigerator is in the refrigeration state, determine the estimated frosting amount of the evaporator according to the first operation parameter, determine the water vapor reduction amount of the intermediate chamber according to the second operation parameter, determine whether the evaporator needs defrosting according to the estimated frosting amount and the water vapor reduction amount, and control the refrigerator to execute the preset defrosting mode if it is determined that the evaporator needs defrosting. Thus, whether defrosting is performed is determined according to the estimated frosting amount of the evaporator and the water vapor reduction amount of the intermediate chamber, the interval time of defrosting is dynamically adjusted, the accuracy of the defrosting opportunity judgment is improved, the defrosting is avoided from being too early or not timely, the system energy consumption is reduced, and the system energy efficiency ratio is improved.

[0126] According to the embodiment of the present application, a refrigerator corresponding to the control device of the refrigerator is also provided. The refrigerator can include the control device of the refrigerator described above.

[0127] Since the processing and functions realized by the refrigerator of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing device, the description of the present embodiment does not elaborate on the related descriptions in the foregoing embodiments, which are not repeated here.

[0128] The technical scheme of the present application is adopted to obtain the first operation parameter when the refrigerator is not in the refrigeration state, obtain the first operation parameter and the second operation parameter when the refrigerator is in the refrigeration state, determine the estimated frosting amount of the evaporator according to the first operation parameter, determine the water vapor reduction amount of the intermediate chamber according to the second operation parameter, determine whether the evaporator needs defrosting according to the estimated frosting amount and the water vapor reduction amount, and control the refrigerator to execute the preset defrosting mode if it is determined that the evaporator needs defrosting. Thus, whether defrosting is performed is determined according to the estimated frosting amount of the evaporator and the water vapor reduction amount of the intermediate chamber, the interval time of defrosting is dynamically adjusted, the accuracy of the defrosting opportunity judgment is improved, the defrosting is avoided from being too early or not timely, the system energy consumption is reduced, and the system energy efficiency ratio is improved.

[0129] According to the embodiment of the present application, a storage medium corresponding to the control method of the refrigerator is also provided. The storage medium includes a stored program, wherein the device where the storage medium is located executes the control method of the refrigerator described above when the program runs.

[0130] Since the processing and functions realized by the storage medium of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, the description of the present embodiment does not elaborate on the related descriptions in the foregoing embodiments, which are not repeated here.

[0131] The technical scheme of the present application is as follows: when the refrigerator is not in a refrigeration state, a first operating parameter is acquired; when the refrigerator is in a refrigeration state, the first operating parameter and a second operating parameter are acquired; an estimated frosting amount of the evaporator is determined according to the first operating parameter, and a water vapor reduction amount of the intermediate chamber is determined according to the second operating parameter; whether the evaporator needs to defrost is determined according to the estimated frosting amount and the water vapor reduction amount; and if it is determined that the evaporator needs to defrost, the refrigerator is controlled to execute a preset defrosting mode. Thus, whether to defrost is determined according to the estimated frosting amount of the evaporator and the water vapor reduction amount of the intermediate chamber, the interval time of defrosting is dynamically adjusted, the accuracy of defrosting timing is improved, defrosting is avoided from being too early or too late, system energy consumption is reduced, and system energy efficiency ratio is improved.

[0132] According to the embodiments of the present application, a computer program product corresponding to the control method of the refrigerator is also provided, which comprises a computer program, and the computer program product is processed to implement the steps of the control method of the refrigerator.

[0133] Since the processing and functions implemented by the computer program product of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, the description of the present embodiment is not detailed, and the relevant description in the foregoing embodiments can be referred to, which is not repeated here.

[0134] The technical scheme of the present application is as follows: when the refrigerator is not in a refrigeration state, a first operating parameter is acquired; when the refrigerator is in a refrigeration state, the first operating parameter and a second operating parameter are acquired; an estimated frosting amount of the evaporator is determined according to the first operating parameter, and a water vapor reduction amount of the intermediate chamber is determined according to the second operating parameter; whether the evaporator needs to defrost is determined according to the estimated frosting amount and the water vapor reduction amount; and if it is determined that the evaporator needs to defrost, the refrigerator is controlled to execute a preset defrosting mode. Thus, whether to defrost is determined according to the estimated frosting amount of the evaporator and the water vapor reduction amount of the intermediate chamber, the interval time of defrosting is dynamically adjusted, the accuracy of defrosting timing is improved, defrosting is avoided from being too early or too late, system energy consumption is reduced, and system energy efficiency ratio is improved.

[0135] In summary, those skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0136] The above only describes the embodiments of the present application and is not used to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A control method of a refrigerator, characterized by, The refrigerator comprises a chamber and an evaporator; the evaporator is used to deliver cold quantity to the chamber; The method comprises: When the refrigerator is not in a refrigeration state, a first operating parameter is acquired; when the refrigerator is in a refrigeration state, a first operating parameter and a second operating parameter are acquired; According to the first operating parameter, an estimated frosting amount of the evaporator is determined; according to the second operating parameter, a water vapor reduction amount of the chamber is determined; According to the estimated frosting amount and the water vapor reduction amount, it is determined whether the evaporator needs to defrost; If it is determined that the evaporator needs to defrost, the refrigerator is controlled to execute a preset defrosting mode; According to the estimated frosting amount and the water vapor reduction amount, it is determined whether the evaporator needs to defrost, comprising: The sum of the estimated frosting amount and the water vapor reduction amount is determined as a total frosting amount, and the size relationship between the total frosting amount and a preset threshold value is judged; If the total frosting amount is greater than the preset threshold value, it is determined that the evaporator needs to defrost; If the total frosting amount is less than or equal to the preset threshold value, it is determined that the evaporator does not need to defrost. 2.The control method of a refrigerator according to claim 1, characterized by, The refrigerator further comprises a compressor and a fan; The fan is used to adjust the air circulation speed between the chamber and the evaporator; The first operating parameter comprises the rotating speed of the compressor, the rotating speed of the fan and the temperature of the evaporator; According to the first operating parameter, the estimated frosting amount of the evaporator is determined, comprising: the estimated frosting amount is calculated according to a preset first formula; the preset first formula is: ； Wherein, Wr is the estimated frosting amount; k1, k2, k3, k4 are all preset parameters; the greater the rotating speed of the compressor, the greater k1; the greater the rotating speed of the fan, the greater k2; the smaller the temperature of the evaporator, the greater k4. 3.The control method of a refrigerator according to claim 2, characterized in that, The chamber has an air outlet and an air return inlet; the second operating parameter comprises the rotating speed of the fan, the temperature and relative humidity at the air outlet, and the temperature and relative humidity at the air return inlet; According to the second operating parameter, the water vapor reduction amount of the chamber is determined, comprising: According to the second operating parameter and a preset second formula, the air flow at the air outlet is calculated; According to the second operating parameter and a preset third formula, the absolute humidity at the air outlet and the absolute humidity at the air return inlet are calculated; According to the air flow at the air outlet, the absolute humidity at the air outlet, the absolute humidity at the air return inlet, and a preset fourth formula, the water vapor reduction amount is calculated. 4.The control method of a refrigerator according to claim 3, characterized in that, The preset second formula is: ； Wherein, L is the air flow at the air outlet; S is the sectional area of the damper opening degree of the chamber; R is the rotating speed of the fan; f is a preset parameter; The preset third formula is: ； Wherein, in the calculation of the absolute humidity at the air outlet, ρ is the absolute humidity at the air outlet, T is the temperature at the air outlet, and RH is the relative humidity at the air outlet; in the calculation of the absolute humidity at the air return inlet, ρ is the absolute humidity at the air return inlet, T is the temperature at the air return inlet, and RH is the relative humidity at the air return inlet; a, b, c, m, Tn, A are all constants; The preset fourth formula is: ； Ws=ρ0-L(ρ0-ρ1) wherein, Ws is the water vapor reduction amount; ρ0 is the absolute humidity at the air outlet; ρ1 is the absolute humidity at the air return; and L is the air flow at the air outlet.

5. A control device of a refrigerator, characterized by comprising: The refrigerator comprises a chamber and an evaporator, and the evaporator is configured to deliver cold energy to the chamber. The device comprises: The acquisition unit is configured to acquire a first operating parameter when the refrigerator is not in a refrigeration state, and acquire the first operating parameter and a second operating parameter when the refrigerator is in a refrigeration state. The control unit is configured to determine an estimated frost amount of the evaporator according to the first operating parameter, and determine a water vapor reduction amount of the chamber according to the second operating parameter. The control unit is further configured to determine whether the evaporator needs defrosting according to the estimated frost amount and the water vapor reduction amount. The control unit is further configured to control the refrigerator to execute a preset defrosting mode if it is determined that the evaporator needs defrosting. The control unit determines whether the evaporator needs defrosting according to the estimated frost amount and the water vapor reduction amount, comprising: The sum of the estimated frost amount and the water vapor reduction amount is determined as a total frost amount, and a size relationship between the total frost amount and a preset threshold value is determined. If the total frost amount is greater than the preset threshold value, it is determined that the evaporator needs defrosting. If the total frost amount is less than or equal to the preset threshold value, it is determined that the evaporator does not need defrosting.

6. The control device of a refrigerator according to claim 5, characterized in that, The refrigerator further comprises a compressor and a fan. The fan is configured to adjust an air circulation speed between the chamber and the evaporator. The first operating parameter comprises a rotation speed of the compressor, a rotation speed of the fan, and a temperature of the evaporator. The control unit determines the estimated frost amount of the evaporator according to the first operating parameter, comprising calculating the estimated frost amount according to a preset first formula. ； The preset first formula is W r=k 1k 2k 3k 4(1- T e) wherein, W r is the estimated frost amount; k 1, k 2, k 3, and k 4 are preset parameters; the greater the rotation speed of the compressor, the greater k 1; the greater the rotation speed of the fan, the greater k 2; and the smaller the temperature of the evaporator, the greater k 4.

7. A refrigerator characterized by comprising: The refrigerator comprises: The control device of the refrigerator according to claim 5 or 6.

8. A storage medium, characterized by The storage medium comprises a stored program, wherein the program controls a device in which the storage medium is located to execute the control method of the refrigerator according to any one of claims 1 to 4 when the program is executed.

9. A computer program product comprising a computer program, characterized in that, The computer program is executed by a processor to implement the steps of the method according to any one of claims 1 to 4.

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