Refrigerator control method and device, refrigerator, storage medium and program product

Abstract

The invention 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 the steps that when the refrigerator is not in a refrigeration state, a first operation parameter is obtained; when the refrigerator is in a refrigeration state, a first operation parameter and a second operation parameter are obtained; the estimated frosting amount of the evaporator is determined according to the first operation parameter, and the water vapor reduction amount of the chamber is determined according to the second operation parameter; whether the evaporator needs to be defrosted or not is determined according to the estimated frosting amount and the water vapor reduction amount; and if it is determined that the evaporator needs to be defrosted, the refrigerator is controlled to execute a preset defrosting mode. According to the scheme, whether defrosting is conducted or not is determined according to the estimated frosting amount of the evaporator and the water vapor reduction amount of the compartment, so that the defrosting interval time is dynamically adjusted, the accuracy of judgment of the defrosting time is improved, the situation that defrosting is conducted in advance or not in time is avoided, system energy consumption is reduced, and the system energy efficiency ratio is increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of refrigerators, and specifically relates to a control method, device, refrigerator, storage medium and computer program product for a refrigerator, and in particular to a control method, device, refrigerator, storage medium and computer program product for a defrost interval of a refrigerator. Background Art

[0002] As a device for absorbing heat by phase change of refrigerator refrigerant, the evaporator often maintains a low temperature during use. In the refrigerator, the evaporator increases the cooling capacity of the freezer, and the temperature of the freezer is relatively low. For example, the freezing temperature of a refrigerator can reach -38°C, that is, the temperature of the evaporator needs to be kept below -38°C. When the air in the refrigerator flows through the evaporator and exchanges heat, the water vapor in the air liquefies and freezes on the surface of the evaporator. After a long time, more and more frost will adhere to the evaporator, weakening the heat exchange efficiency between the air and the evaporator. The result 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. The refrigerant gradually accumulates in the liquid storage tank, which may cause liquid shock to the compressor.

[0003] Therefore, the evaporator needs to be defrosted in time after it is frosted. The relevant plan is to start defrosting the refrigerator after a fixed period of time. This defrosting method cannot predict the amount of frost on the evaporator, so defrosting may not be timely, resulting in a weakened refrigeration capacity of the refrigerator.

[0004] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The object of the present invention is to provide a control method, device, refrigerator, storage medium and computer program product for a refrigerator, so as to solve the problem in related schemes that the refrigerator cannot be defrosted in time according to the amount of frost on the evaporator, resulting in a weakened refrigeration capacity of the refrigerator, so as to achieve the effect of determining whether to defrost according to the estimated amount of frost on the evaporator and the amount of water vapor reduction in the compartment, thereby dynamically adjusting the defrosting interval, improving the accuracy of defrosting timing judgment, avoiding early defrosting or untimely defrosting, reducing system energy consumption, and improving the system energy efficiency ratio.

[0006] The present invention provides a control method for a refrigerator, the refrigerator comprising a compartment and an evaporator; the evaporator is used to transmit cold energy to the compartment; the method comprises: when the refrigerator is not in a refrigeration state, obtaining a first operating parameter; when the refrigerator is in a refrigeration state, obtaining a first operating parameter and a second operating parameter; determining an estimated frosting amount of the evaporator according to the first operating parameter, and determining a water vapor reduction amount of the compartment according to the second operating parameter; determining whether the evaporator needs to be defrosted according to the estimated frosting amount and the water vapor reduction amount; if it is determined that the evaporator needs to be defrosted, 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 to adjust the air circulation speed between the compartment and the evaporator; the first operating parameter comprises: the speed of the compressor, the speed of the fan, and the temperature of the evaporator; determining the estimated frost amount of the evaporator according to the first operating parameter comprises: calculating the estimated frost amount according to a preset first formula; the preset first formula is;

[0008] Wr=∫k4*(k1+k2+k3)d(t);

[0009] Among them, Wr is the estimated frost amount; k1, k2, k3, and k4 are all preset parameters; the greater the speed of the compressor, the greater the k1; the greater the speed of the fan, the greater the k2; the lower the temperature of the evaporator, the greater the k4.

[0010] In some embodiments, the compartment has an air outlet and a return air outlet; the second operating parameters include: 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 outlet; determining the water vapor reduction amount of the compartment according to the second operating parameters includes: calculating the air flow at the air outlet according to the second operating parameters and a preset second formula; calculating the absolute humidity at the air outlet and the absolute humidity at the return air outlet according to the second operating parameters 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 return air outlet, and a preset fourth formula.

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

[0012] L = S * R * f;

[0013] Wherein, L is the air flow at the outlet; S is the cross-sectional area of ​​the damper opening of the compartment; R is the speed of the fan; and f is a preset parameter;

[0014] The preset third formula is:

[0015]

[0016] Wherein, when calculating 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; when calculating the absolute humidity at the return air outlet, ρ 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;

[0017] The preset fourth formula is:

[0018] Ws(t)=∫(ρ0-ρ1)*L*d(t);

[0019] Wherein, Ws is the water vapor reduction; ρ0 is the absolute humidity at the air outlet; ρ1 is the absolute humidity at the return air outlet; and L is the air flow at the air outlet.

[0020] In some embodiments, determining whether the evaporator needs to be defrosted is based on the estimated frost amount and the water vapor reduction amount, including: determining the sum of the estimated frost amount and the water vapor reduction amount as the total frost amount, and judging the 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 to be defrosted; if the total frost amount is less than or equal to the preset threshold, determining that the evaporator does not need to be defrosted.

[0021] Matching the above method, another aspect of the present invention provides a control device for a refrigerator, the refrigerator comprising a compartment and an evaporator; the evaporator is used to transport cold energy to the compartment; the device comprises: an acquisition unit configured to acquire a first operating parameter when the refrigerator is not in a refrigeration state; and to 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 frosting amount of the evaporator according to the first operating parameter, and to determine a water vapor reduction amount of the compartment according to the second operating parameter; the control unit is further configured to determine whether the evaporator needs to be defrosted according to the estimated frosting 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 to be defrosted.

[0022] In some embodiments, the refrigerator further comprises a compressor and a fan; the fan is used to adjust the air circulation speed between the compartment and the evaporator; the first operating parameter comprises: the speed of the compressor, the speed of the fan, and the 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;

[0023] Wr=∫k4*(k1+k2+k3)d(t);

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

[0025] In some embodiments, the compartment has an air outlet and a return air outlet; the second operating parameters include: 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 outlet; the control unit determines the water vapor reduction amount of the compartment according to the second operating parameters, including: calculating the air flow at the air outlet according to the second operating parameters and a preset second formula; calculating the absolute humidity at the air outlet and the absolute humidity at the return air outlet according to the second operating parameters 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 return air outlet, and a preset fourth formula.

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

[0027] L = S * R * f;

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

[0029] The preset third formula is:

[0030]

[0031] Wherein, when calculating 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; when calculating the absolute humidity at the return air outlet, ρ 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;

[0032] The preset fourth formula is:

[0033] Ws(t)=∫(ρ0-ρ1)*L*d(t);

[0034] Wherein, Ws is the water vapor reduction; ρ0 is the absolute humidity at the air outlet; ρ1 is the absolute humidity at the return air outlet; and L is the air flow at the air outlet.

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

[0036] Matching the above device, the present invention provides a refrigerator on another aspect, including: the control device of the refrigerator described above.

[0037] In accordance with the above method, the present invention provides a storage medium on the other hand, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the refrigerator control method described above.

[0038] Matching the above method, the present invention provides a computer program product on another aspect, wherein the computer program product includes a computer program, and when the computer program product is processed and executed, the steps of the above refrigerator control method are implemented.

[0039] The scheme of the present invention obtains the first operating parameter when the refrigerator is not in a refrigeration state; obtains the first operating parameter and the second operating parameter when the refrigerator is in a refrigeration state; determines the estimated frosting amount of the evaporator according to the first operating parameter, and determines the water vapor reduction amount of the compartment according to the second operating parameter; determines whether the evaporator needs to be defrosted according to the estimated frosting amount and the water vapor reduction amount; if it is determined that the evaporator needs to be defrosted, the refrigerator is controlled to execute a preset defrosting mode. Therefore, by determining whether to defrost according to the estimated frosting amount of the evaporator and the water vapor reduction amount of the compartment, the defrosting interval time is dynamically adjusted, the accuracy of defrosting timing judgment is improved, early defrosting or untimely defrosting is avoided, the system energy consumption is reduced, and the system energy efficiency ratio is improved.

[0040] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention.

[0041] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic flow chart of an embodiment of a refrigerator control method of the present invention;

[0043] Figure 2 It is a structural schematic diagram of an embodiment of a refrigerator control device of the present invention;

[0044] Figure 3 is a schematic diagram of the structure of a refrigerator;

[0045] Figure 4 The present invention is a flowchart of a method for controlling the defrosting interval of a refrigerator.

[0046] In conjunction with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

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

[0048] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

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

[0050] During the refrigeration process of the refrigerator, after the compressor compresses the refrigerant into high-temperature and high-pressure gas, the refrigerant passes through the condenser and throttling device in turn to cool down and reduce the pressure, and becomes a low-temperature liquid refrigerant. After that, the refrigerant exchanges heat with the air at the evaporator to cool the air. The cooled air is sent to the refrigerator compartment, so that the temperature in the compartment is always in a low range. The compartment can include a refrigerated compartment and a frozen compartment according to the set temperature. The temperature in the refrigerated compartment is higher than the temperature in the frozen compartment, that is, the evaporator sends more cold energy to the frozen compartment.

[0051] like Figure 3As shown, the compartment is provided with an air outlet 1 and an air return port 2. The air in the compartment flows to the evaporator through the air outlet, and the air at the evaporator flows to the compartment through the air return port, thereby forming an air circulation, so that the evaporator continuously supplies cold air to the compartment. In order to adjust the air circulation speed between the compartment and the evaporator, a fan is provided. The greater the fan speed, the faster the air circulates, and the smaller the fan speed, the slower the air circulates. Temperature and humidity sensors are provided at the air outlet and the air return port of the compartment to collect the temperature and relative humidity of the air.

[0052] like Figure 1 The flowchart of an embodiment of the method of the present invention is shown in FIG. The refrigerator control method may include: steps S110 to S140.

[0053] In step S110, 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.

[0054] The refrigerator is an air-cooled single-system refrigerator. When the compartment is not in the refrigeration state, that is, the damper at the return air outlet of the compartment is in the closed state, at this time, the estimated frost amount of the evaporator is calculated; when the compartment is in the refrigeration state, the damper is open, at this time, the estimated frost amount of the evaporator and the water vapor reduction amount of the compartment are calculated.

[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 return air outlet.

[0056] In 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 compartment 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] Among them, Wr is the estimated frost amount; k1, k2, k3, and k4 are all preset parameters; the greater the speed of the compressor, the greater the k1; the greater the speed of the fan, the greater the k2; the lower the temperature of the evaporator, the greater the k4.

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

[0061] In the preset first formula, k1 is directly proportional to 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, where the unit of the compressor speed is RPM and the unit of k1 is g / (RPM*Min).

[0062] k2 is directly 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, where the unit of fan speed is RPM and the unit of k2 is g / (RPM*Min).

[0063] k3 is the coefficient of the interval time from the last defrost and is a fixed value.

[0064] k4 is inversely proportional to the temperature of the evaporator. For example, when the evaporator temperature is within (-∞, -33), k4 is 1; when the evaporator temperature is within [-33, -18), k4 is 0.8; when the evaporator temperature is within [-18, -10), k4 is 0.7; when the evaporator temperature is within [-10, -5), k4 is 0.5; when the evaporator temperature is within [-5, 0), k4 is 0.2; when the evaporator temperature is within [0, +∞), k4 is 0, where the unit of the evaporator temperature is ℃.

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

[0066] When cooling the compartment, the air in the compartment circulates to the evaporator for cooling, and the water vapor in the air condenses into water droplets attached to the evaporator, and finally forms a frost layer. Therefore, the amount of frost on the evaporator can be calculated based on the amount of water vapor reduction in the air. That is, the amount of frost on the evaporator at this time is not only related to the compressor speed, 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] When the evaporator cools the compartment, the air in the compartment flows from the air outlet to the evaporator, and then flows back to the compartment from the return air outlet. Therefore, the reduction in water vapor in the air can be calculated based on the absolute humidity content of the air outlet and the return air outlet combined with the air flow rate.

[0068] Step S210, calculating the air flow at the air outlet 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 cross-sectional area of ​​the air door opening of the compartment; R is the rotation speed of the fan; and f is a preset parameter, which is a compensation correction factor for the air flow.

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

[0072]

[0073] Among them, when calculating the absolute humidity content at the air outlet, ρ is the absolute humidity content at the air outlet, T is the temperature at the air outlet, and RH is the relative humidity at the air outlet; when calculating the absolute humidity content at the return air outlet, ρ is the absolute humidity content 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] Step S230, calculating the water vapor reduction amount according to the air flow and 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)=∫(ρ0-ρ1)*L*d(t);

[0076] Among them, Ws is the water vapor reduction, and only the positive integral is accumulated, that is, only the water vapor reduction is accumulated, and the water vapor increase is ignored; ρ0 is the absolute humidity at the air outlet; ρ1 is the absolute humidity at the return air outlet; 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] This solution does not directly determine the defrosting interval between defrosting, but estimates the total amount of frost on the evaporator and determines whether to defrost based on the total amount of frost. That is, the interval between each defrosting is uncertain, so that defrosting is more in line with current actual needs, avoiding fluctuations in compartment temperature, and reducing refrigerator operation power consumption.

[0079] In some embodiments, in step S130, the specific process of determining whether the evaporator needs to be defrosted based on the estimated frost amount and the water vapor reduction amount includes: determining the sum of the estimated frost amount and the water vapor reduction amount as the total frost amount, and judging the 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 to be defrosted; if the total frost amount is less than or equal to the preset threshold, determining that the evaporator does not need to be defrosted.

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

[0081] At step S140, if it is determined that the evaporator needs to be defrosted, the refrigerator is controlled to execute a preset defrost mode. The preset defrost mode is used to defrost the evaporator.

[0082] By calculating the estimated frost amount and water vapor reduction amount based on the parameters during refrigerator operation, the frost amount of the evaporator can be estimated, which improves the accuracy of judging the timing of defrosting and avoids premature or untimely defrosting, thereby reducing the loss caused by long-term frosting of the evaporator, reducing system energy consumption, and improving the system energy efficiency ratio.

[0083] Figure 4 FIG. 1 is a flow chart of a method for controlling the defrosting interval of a refrigerator according to the present invention. Figure 4 As shown, including:

[0084] Step 1: Determine whether the refrigerator compartment is refrigerating. If the refrigerator compartment is refrigerating, the water vapor reduction amount Ws and the estimated frost amount Wr are accumulated; if the refrigerator 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, determine whether W>defrost threshold. If W>defrost threshold, enter the defrost cycle, start defrosting, and clear the frost amount W. If W≤defrost threshold, execute step 1.

[0086] According to the technical solution of this embodiment, when the refrigerator is not in the refrigeration state, the first operating parameter is obtained; when the refrigerator is in the refrigeration state, the first operating parameter and the second operating parameter are obtained; the estimated frosting amount of the evaporator is determined according to the first operating parameter, and the water vapor reduction amount of the compartment is determined according to the second operating parameter; whether the evaporator needs to be defrosted is determined according to the estimated frosting amount and the water vapor reduction amount; if it is determined that the evaporator needs to be defrosted, the refrigerator is controlled to execute a preset defrosting mode. Therefore, by determining whether to defrost according to the estimated frosting amount of the evaporator and the water vapor reduction amount of the compartment, the defrosting interval is dynamically adjusted, the accuracy of the defrosting timing judgment is improved, early defrosting or untimely defrosting is avoided, the system energy consumption is reduced, and the system energy efficiency ratio is improved.

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

[0088] During the refrigeration process of the refrigerator, after the compressor compresses the refrigerant into high-temperature and high-pressure gas, the refrigerant passes through the condenser and throttling device in turn to cool down and reduce the pressure, and becomes a low-temperature liquid refrigerant. After that, the refrigerant exchanges heat with the air at the evaporator to cool the air. The cooled air is sent to the refrigerator compartment, so that the temperature in the compartment is always in a low range. The compartment can include a refrigerated compartment and a frozen compartment according to the set temperature. The temperature in the refrigerated compartment is higher than the temperature in the frozen compartment, that is, the evaporator sends more cold energy to the frozen compartment.

[0089] like Figure 3 As shown, the compartment is provided with an air outlet 1 and an air return port 2. The air in the compartment flows to the evaporator through the air outlet, and the air at the evaporator flows to the compartment through the air return port, thereby forming an air circulation, so that the evaporator continuously supplies cold air to the compartment. In order to adjust the air circulation speed between the compartment and the evaporator, a fan is provided. The greater the fan speed, the faster the air circulates, and the smaller the fan speed, the slower the air circulates. Temperature and humidity sensors are provided at the air outlet and the air return port of the compartment to collect the temperature and relative humidity of the air.

[0090] See also Figure 2 The schematic diagram of the structure of an embodiment of the device of the present invention is shown. The control device of the refrigerator may 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 a refrigeration state; and acquire the first operating parameter and the second operating parameter when the refrigerator is in a refrigeration state. The specific functions and processing of the acquisition unit 102 refer to step S110.

[0092] The refrigerator is an air-cooled single-system refrigerator. When the compartment is not in the refrigeration state, that is, the damper at the return air outlet of the compartment is in the closed state, at this time, the estimated frost amount of the evaporator is calculated; when the compartment is in the refrigeration state, the damper is open, at this time, the estimated frost amount of the evaporator and the water vapor reduction amount of the compartment are calculated.

[0093] 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 return air outlet.

[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 processing of the control unit 104 refer 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] Among them, Wr is the estimated frost amount; k1, k2, k3, and k4 are all preset parameters; the greater the speed of the compressor, the greater the k1; the greater the speed of the fan, the greater the k2; the lower the temperature of the evaporator, the greater the k4.

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

[0099] In the preset first formula, k1 is directly proportional to 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, where the unit of the compressor speed is RPM and the unit of k1 is g / (RPM*Min).

[0100] k2 is directly 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, where the unit of fan speed is RPM and the unit of k2 is g / (RPM*Min).

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

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

[0103] In some embodiments, the control unit 104 determines the specific process of reducing the amount of water vapor in the compartment according to the second operating parameter, including:

[0104] When cooling the compartment, the air in the compartment circulates to the evaporator for cooling, and the water vapor in the air condenses into water droplets attached to the evaporator, and finally forms a frost layer. Therefore, the amount of frost on the evaporator can be calculated based on the amount of water vapor reduction in the air. That is, the amount of frost on the evaporator at this time is not only related to the compressor speed, 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] When the evaporator cools the compartment, the air in the compartment flows from the air outlet to the evaporator, and then flows back to the compartment from the return air outlet. Therefore, the reduction in water vapor in the air can be calculated based on the absolute humidity content of the air outlet and the return air outlet combined with the air flow rate.

[0106] The control unit 104 is further 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 processing of the control unit 104 refer to 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 cross-sectional area of ​​the air door opening of the compartment; R is the rotation speed of the fan; and f is a preset parameter, which is a compensation correction factor for 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 return air outlet according to the second operating parameter and a preset third formula. The specific functions and processing of the control unit 104 refer to step S220. The preset third formula is:

[0110]

[0111] Among them, when calculating the absolute humidity content at the air outlet, ρ is the absolute humidity content at the air outlet, T is the temperature at the air outlet, and RH is the relative humidity at the air outlet; when calculating the absolute humidity content at the return air outlet, ρ is the absolute humidity content 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.

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

[0113] Ws(t)=∫(ρ0-ρ1)*L*d(t);

[0114] Among them, Ws is the water vapor reduction, and only the positive integral is accumulated, that is, only the water vapor reduction is accumulated, and the water vapor increase is ignored; ρ0 is the absolute humidity at the air outlet; ρ1 is the absolute humidity at the return air outlet; L is the air flow at the air outlet.

[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 functions and processing of the control unit 104 refer to step S130.

[0116] This solution does not directly determine the defrosting interval between defrosting, but estimates the total amount of frost on the evaporator and determines whether to defrost based on the total amount of frost. That is, the interval between each defrosting is uncertain, so that defrosting is more in line with current actual needs, avoiding fluctuations in compartment temperature, and reducing refrigerator operation power consumption.

[0117] In some embodiments, the control unit 104 determines the specific process of whether the evaporator needs to be defrosted based on the estimated frost amount and the water vapor reduction amount, including: determining the sum of the estimated frost amount and the water vapor reduction amount as the total frost amount, and judging the 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 to be defrosted; if the total frost amount is less than or equal to the preset threshold, determining that the evaporator does not need to be defrosted.

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

[0119] The control unit 104 is further configured to control the refrigerator to execute a preset defrost mode if it is determined that the evaporator needs to be defrosted. The preset defrost mode is used to defrost the evaporator. The specific functions and processing of the control unit 104 refer to step S140.

[0120] By calculating the estimated frost amount and water vapor reduction amount based on the parameters during refrigerator operation, the frost amount of the evaporator can be estimated, which improves the accuracy of judging the timing of defrosting and avoids premature or untimely defrosting, thereby reducing the loss caused by long-term frosting of the evaporator, reducing system energy consumption, and improving the system energy efficiency ratio.

[0121] Figure 4 FIG. 1 is a flow chart of a method for controlling the defrosting interval of a refrigerator according to the present invention. Figure 4 As shown, including:

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

[0123] Step 2, determine whether W>defrost threshold. If W>defrost threshold, enter the defrost cycle, start defrosting, and clear the frost amount W. If W≤defrost threshold, execute step 1.

[0124] Since the processing and functions implemented by the device of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0125] According to the technical solution of the present invention, when the refrigerator is not in a refrigeration state, the first operating parameter is obtained; when the refrigerator is in a refrigeration state, the first operating parameter and the second operating parameter are obtained; the estimated frosting amount of the evaporator is determined according to the first operating parameter, and the water vapor reduction amount of the compartment is determined according to the second operating parameter; whether the evaporator needs to be defrosted is determined according to the estimated frosting amount and the water vapor reduction amount; if it is determined that the evaporator needs to be defrosted, the refrigerator is controlled to execute a preset defrosting mode. Therefore, by determining whether to defrost according to the estimated frosting amount of the evaporator and the water vapor reduction amount of the compartment, the interval time of defrosting is dynamically adjusted, the accuracy of defrosting timing judgment is improved, early defrosting or untimely defrosting is avoided, the energy consumption of the system is reduced, and the energy efficiency ratio of the system is improved.

[0126] According to an embodiment of the present invention, a refrigerator corresponding to the control device of the refrigerator is also provided. The refrigerator may include: the control device of the refrigerator described above.

[0127] Since the processing and functions implemented by the refrigerator of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned devices, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0128] According to the technical solution of the present invention, when the refrigerator is not in a refrigeration state, the first operating parameter is obtained; when the refrigerator is in a refrigeration state, the first operating parameter and the second operating parameter are obtained; the estimated frosting amount of the evaporator is determined according to the first operating parameter, and the water vapor reduction amount of the compartment is determined according to the second operating parameter; whether the evaporator needs to be defrosted is determined according to the estimated frosting amount and the water vapor reduction amount; if it is determined that the evaporator needs to be defrosted, the refrigerator is controlled to execute a preset defrosting mode. Therefore, by determining whether to defrost according to the estimated frosting amount of the evaporator and the water vapor reduction amount of the compartment, the interval time of defrosting is dynamically adjusted, the accuracy of defrosting timing judgment is improved, early defrosting or untimely defrosting is avoided, the energy consumption of the system is reduced, and the energy efficiency ratio of the system is improved.

[0129] According to an embodiment of the present invention, a storage medium corresponding to a refrigerator control method is also provided, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the refrigerator control method described above.

[0130] Since the processing and functions implemented by the storage medium of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0131] According to the technical solution of the present invention, when the refrigerator is not in a refrigeration state, the first operating parameter is obtained; when the refrigerator is in a refrigeration state, the first operating parameter and the second operating parameter are obtained; the estimated frosting amount of the evaporator is determined according to the first operating parameter, and the water vapor reduction amount of the compartment is determined according to the second operating parameter; whether the evaporator needs to be defrosted is determined according to the estimated frosting amount and the water vapor reduction amount; if it is determined that the evaporator needs to be defrosted, the refrigerator is controlled to execute a preset defrosting mode. Therefore, by determining whether to defrost according to the estimated frosting amount of the evaporator and the water vapor reduction amount of the compartment, the interval time of defrosting is dynamically adjusted, the accuracy of defrosting timing judgment is improved, early defrosting or untimely defrosting is avoided, the energy consumption of the system is reduced, and the energy efficiency ratio of the system is improved.

[0132] According to an embodiment of the present invention, a computer program product corresponding to the refrigerator control method is also provided, and the computer program product includes a computer program, and when the computer program product is processed and executed, the steps of the refrigerator control method are implemented.

[0133] Since the processing and functions implemented by the computer program product of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0134] According to the technical solution of the present invention, when the refrigerator is not in a refrigeration state, the first operating parameter is obtained; when the refrigerator is in a refrigeration state, the first operating parameter and the second operating parameter are obtained; the estimated frosting amount of the evaporator is determined according to the first operating parameter, and the water vapor reduction amount of the compartment is determined according to the second operating parameter; whether the evaporator needs to be defrosted is determined according to the estimated frosting amount and the water vapor reduction amount; if it is determined that the evaporator needs to be defrosted, the refrigerator is controlled to execute a preset defrosting mode. Therefore, by determining whether to defrost according to the estimated frosting amount of the evaporator and the water vapor reduction amount of the compartment, the interval time of defrosting is dynamically adjusted, the accuracy of defrosting timing judgment is improved, early defrosting or untimely defrosting is avoided, the energy consumption of the system is reduced, and the energy efficiency ratio of the system is improved.

[0135] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0136] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A refrigerator control method, characterized in that: The refrigerator comprises a compartment and an evaporator; the evaporator is used to deliver cold energy to the compartment; The method comprises: When the refrigerator is not in a refrigeration state, obtaining a first operating parameter; when the refrigerator is in a refrigeration state, obtaining a first operating parameter and a second operating parameter; determining an estimated amount of frost on the evaporator according to the first operating parameter, and determining a water vapor reduction amount in the compartment according to the second operating parameter; Determining whether the evaporator needs to be defrosted according to the estimated frost amount and the water vapor reduction amount; If it is determined that the evaporator needs to be defrosted, the refrigerator is controlled to execute a preset defrost mode.

2. The refrigerator control method according to claim 1, characterized in that: The refrigerator also includes a compressor and a fan; The fan is used to adjust the air circulation speed between the compartment and the evaporator; The first operating parameter includes: the speed of the compressor, the speed of the fan, and the temperature of the evaporator; 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: Wr=∫k4*(k1+k2+k3)d(t); Among them, Wr is the estimated frost amount; k1, k2, k3, and k4 are all preset parameters; the greater the speed of the compressor, the greater the k1; the greater the speed of the fan, the greater the k2; the lower the temperature of the evaporator, the greater the k4.

3. The refrigerator control method according to claim 1, characterized in that: The compartment has an air outlet and an air return outlet; the second operating parameters include: the speed of the fan, the temperature and relative humidity at the air outlet, and the temperature and relative humidity at the air return outlet; Determining the water vapor reduction amount of the compartment according to the second operating parameter includes: Calculate the air flow at the air outlet according to the second operating parameter and a preset second formula; Calculate the absolute humidity at the air outlet and the absolute humidity at the return air outlet according to the second operating parameter and a preset third formula; The water vapor reduction amount is calculated based on the air flow and absolute humidity at the air outlet, the absolute humidity at the return air outlet, and a preset fourth formula.

4. The refrigerator control method according to claim 3, characterized in that: The preset second formula is: L = S * R * f; Wherein, L is the air flow at the outlet; S is the cross-sectional area of ​​the damper opening of the compartment; R is the speed of the fan; and f is a preset parameter; The preset third formula is: Wherein, when calculating 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; when calculating the absolute humidity at the return air outlet, ρ 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; The preset fourth formula is: Ws(t)=∫(ρ0-ρ1)*L*d(t); Wherein, Ws is the water vapor reduction; ρ0 is the absolute humidity at the air outlet; ρ1 is the absolute humidity at the return air outlet; and L is the air flow at the air outlet.

5. The refrigerator control method according to any one of claims 1 to 4, characterized in that: Determining whether the evaporator needs to be defrosted according to the estimated frosting amount and the water vapor reduction amount includes: Determine the sum of the estimated frost amount and the water vapor reduction amount as the total frost amount, and determine the magnitude relationship between the total frost amount and a preset threshold; If the total frost amount is greater than a preset threshold, it is determined that the evaporator needs to be defrosted; If the total frost amount is less than or equal to a preset threshold, it is determined that the evaporator does not need to be defrosted.

6. A refrigerator control device, characterized in that: The refrigerator comprises a compartment and an evaporator; the evaporator is used to deliver cold energy to the compartment; The device comprises: an acquisition unit configured to acquire the first operating parameter when the refrigerator is not in a refrigeration state; and acquire the first operating parameter and the second operating parameter when the refrigerator is in a refrigeration state; a control unit configured to determine an estimated amount of frost on the evaporator according to the first operating parameter and to determine an amount of water vapor reduction in the compartment according to the second operating parameter; The control unit 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 control unit is further configured to control the refrigerator to execute a preset defrost mode if it is determined that the evaporator needs to be defrosted.

7. The refrigerator control device according to claim 6, characterized in that: The refrigerator also includes a compressor and a fan; The fan is used to adjust the air circulation speed between the compartment and the evaporator; The first operating parameter includes: the speed of the compressor, the speed of the fan, and the temperature of the evaporator; The control unit 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: Wr=∫k4*(k1+k2+k3)d(t); Among them, Wr is the estimated frost amount; k1, k2, k3, and k4 are all preset parameters; the greater the speed of the compressor, the greater the k1; the greater the speed of the fan, the greater the k2; the lower the temperature of the evaporator, the greater the k4.

8. A refrigerator, characterized in that: include: A refrigerator control device as claimed in claim 6 or 7.

9. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the refrigerator control method according to any one of claims 1 to 5.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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