A method for determining a defrosting cycle of a variable frequency refrigerator

Abstract

The application provides a variable frequency refrigerator defrosting cycle determination method, comprising: obtaining a refrigerator operating parameter; the refrigerator operating parameter comprises: operating time of a compressor at different frequencies, compressor speed, and refrigerator door opening time; based on the compressor speed, the operating time of the compressor at different frequencies is corrected to obtain a compressor operating time correction value; the refrigerator door opening time is corrected to obtain a refrigerator door opening time correction value; based on the compressor operating time correction value and the refrigerator door opening time correction value, an evaporator frosting duration is obtained; when the evaporator frosting duration is greater than or equal to a first preset time, after the compressor stops operating, a defrosting operation is performed, so as to solve the problem that the current variable frequency refrigerator cannot flexibly perform a defrosting operation according to the operating condition of the compressor, thereby reducing the refrigeration efficiency of the refrigerator and increasing the energy consumption of the refrigerator.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration equipment, in particular to a method for determining defrosting cycle of a variable frequency refrigerator. BACKGROUND

[0002] The air-cooled refrigerator is also called frost-free refrigerator. After the refrigerator runs for a period of time, the thickness of the frost layer on the evaporator becomes large, which affects the refrigeration effect. Therefore, an automatic defrosting function is usually designed. How to accurately determine when to start defrosting is one of the key technologies for realizing energy saving and refrigeration reliability of the air-cooled variable frequency refrigerator.

[0003] At present, whether defrosting operation is needed is determined by presetting a fixed time. For example, when the refrigerator is working, the cumulative running time of the compressor of the refrigerator is recorded by a timer. When the cumulative running time of the compressor of the refrigerator is greater than or equal to the preset fixed time, the refrigerator performs defrosting operation, and then the timer is cleared and the cumulative running time of the compressor of the refrigerator is recorded again. The refrigerator is defrosted by timing.

[0004] However, during the operation of the variable frequency refrigerator, the compressor of the variable frequency refrigerator is difficult to work at a stable frequency during the interval between two defrosting operations. The preset fixed time cannot be adjusted according to the working frequency of the compressor, which may cause the following problems. When the compressor runs at a lower frequency for a long time within the preset fixed time, the defrosting operation is performed when the amount of frost on the evaporator is small, which wastes energy. When the compressor runs at a higher frequency for a long time within the preset fixed time, the defrosting operation is performed when the amount of frost on the evaporator is large, which affects the refrigeration efficiency of the variable frequency refrigerator. The defrosting operation cannot be flexibly performed according to the operation of the compressor in the variable frequency refrigerator, which reduces the refrigeration efficiency of the refrigerator and increases the energy consumption of the refrigerator. SUMMARY

[0005] The present application provides a method for determining defrosting cycle of a variable frequency refrigerator to solve the technical problem that the existing variable frequency refrigerator cannot flexibly perform defrosting operation according to the operation of the compressor, which reduces the refrigeration efficiency of the refrigerator and increases the energy consumption of the refrigerator.

[0006] The present application provides a method for determining defrosting cycle of a variable frequency refrigerator, comprising:

[0007] obtaining a refrigerator running parameter; the refrigerator running parameter comprises: running time of the compressor at different frequencies, rotating speed of the compressor, and opening time of a refrigerator door;

[0008] correcting the running time of the compressor at different frequencies based on the rotating speed of the compressor to obtain a corrected compressor running time;

[0009] correcting the opening time of the refrigerator door to obtain a corrected opening time of the refrigerator door;

[0010] obtain an evaporator frosting duration based on the compressor running time correction value and the refrigerator door opening time correction value;

[0011] When the evaporator frosting duration is greater than or equal to a first preset time, perform a defrosting operation after the compressor stops running.

[0012] In some embodiments, the step of correcting the running time of the compressor at different frequencies based on the compressor speed to obtain a compressor running time correction value comprises:

[0013] obtain a speed correction coefficient based on the compressor speed; the speed correction coefficient is determined by the following formula:

[0014] k = P ÷ n;

[0015] In the formula, k is the speed correction coefficient; P is the compressor speed; n is the compressor speed setting reference value;

[0016] obtain a compressor running time correction value based on the correction coefficient and the running time of the compressor at different frequencies; the compressor running time correction value is determined by the following formula:

[0017] t y = P × t n ;

[0018] In the formula, t y is the compressor running time correction value; t n is the running time of the compressor at different frequencies.

[0019] In some embodiments, the step of correcting the refrigerator door opening time to obtain a refrigerator door opening time correction value comprises:

[0020] determine an opening time correction coefficient;

[0021] obtain a refrigerator door opening time correction value based on the refrigerator door opening time and the opening time correction coefficient; the refrigerator door opening time correction value is determined by the following formula:

[0022] t m = a × t1 ÷ 60;

[0023] In the formula, t m is the refrigerator door opening time correction value; a is the opening time correction coefficient; t1 is the refrigerator door opening time.

[0024] In some embodiments, the evaporator frosting duration is determined by the following formula:

[0025] t e = ty +t m ;

[0026] In the formula, t e This refers to the evaporator frosting time.

[0027] In some embodiments, the step of performing a defrosting operation after the compressor stops running when the evaporator frosting time is greater than or equal to a first preset time includes:

[0028] When the evaporator frosting time is greater than or equal to a first preset time, it is determined whether the compressor running time is greater than a second preset time; the second preset time is greater than the first preset time.

[0029] If so, the compressor will stop running and a defrosting operation will be performed.

[0030] In some embodiments, the refrigerator operating parameters further include: a first temperature value and a second temperature value of the evaporator when the refrigerator compartment and the freezer compartment stop cooling;

[0031] The method further includes:

[0032] Obtain the real-time temperature value of the evaporator after the third preset time following the defrosting operation;

[0033] Based on the first temperature value and the second temperature value, a first temperature reference value and a second temperature reference value are obtained;

[0034] When the refrigerator compartment is in cooling mode, if the real-time temperature value is less than or equal to the first temperature reference value, the compressor is controlled to stop running and a defrosting operation is performed.

[0035] When the freezer compartment is in cooling mode, if the real-time temperature value is less than or equal to the second temperature reference value, the compressor is controlled to stop running and a defrosting operation is performed.

[0036] In some embodiments, the step of obtaining a first temperature reference value and a second temperature reference value based on the first temperature value and the second temperature value includes:

[0037] Determine the temperature correction factor;

[0038] Based on the temperature correction coefficient, a first temperature reference value and a second temperature reference value are obtained based on the first temperature value and the second temperature value.

[0039] The first temperature reference value is determined by the following formula:

[0040] T1 = T ce -ΔT;

[0041] In the formula, T1 is the first temperature reference value; Tce The first temperature value is ΔT; ΔT is the temperature correction factor.

[0042] The second temperature reference value is determined by the following formula:

[0043] T2 = T de -ΔT;

[0044] In the formula, T2 is the second temperature reference value; T de This is the second temperature value.

[0045] In some embodiments, after the step of obtaining the real-time temperature value of the evaporator after a third preset time following the defrosting operation, the method further includes:

[0046] If the refrigerator is in the cooling state after the first defrosting operation, and the refrigerator compartment and the freezer compartment are in the cooling state after the third preset time, then the first temperature value and the second temperature value are determined as the first preset value and the second preset value.

[0047] Based on the first preset value and the second preset value, a first temperature reference value and a second temperature reference value are obtained;

[0048] If the real-time temperature value is less than or equal to the first temperature reference value, and the duration is greater than or equal to the fourth preset time, then the compressor is controlled to stop running and a defrosting operation is performed.

[0049] If the real-time temperature value is less than or equal to the second temperature reference value, and the duration is greater than or equal to the fourth preset time, then the compressor is controlled to stop running and a defrosting operation is performed.

[0050] In some embodiments, the method further includes:

[0051] If the refrigerator remains in cooling mode for a period of time longer than the fifth preset time, the compressor will be stopped and a defrosting operation will be performed. The fifth preset time is longer than the first preset time, the second preset time, the third preset time, and the fourth preset time.

[0052] In some embodiments, prior to the step of obtaining the refrigerator operating parameters, the following steps are included:

[0053] If the refrigerator is being powered on for the first time, the step of obtaining the refrigerator's operating parameters will be executed after the refrigerator has been powered on for the sixth preset time.

[0054] This application provides a method for determining the defrosting cycle of an inverter refrigerator, comprising: acquiring refrigerator operating parameters; the refrigerator operating parameters including: compressor operating time at different frequencies, compressor speed, and refrigerator door opening time; based on the compressor speed, correcting the compressor operating time at different frequencies to obtain a compressor operating time correction value; correcting the refrigerator door opening time to obtain a refrigerator door opening time correction value; based on the compressor operating time correction value and the refrigerator door opening time correction value, obtaining the evaporator frosting time; when the evaporator frosting time is greater than or equal to a first preset time, performing a defrosting operation after the compressor stops running, so as to enable the inverter refrigerator to flexibly perform defrosting operation according to the compressor operating conditions, thereby improving the refrigerator's cooling efficiency and reducing the refrigerator's energy consumption. Attached Figure Description

[0055] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0056] Figure 1 This is a flowchart of the method for determining the defrosting cycle of a variable frequency refrigerator in this application. Detailed Implementation

[0057] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0058] Because some technologies fail to allow inverter refrigerators to flexibly perform defrosting operations based on the compressor's operating status, this results in reduced cooling efficiency and increased energy consumption. To address this technical problem, this application provides a method for determining the defrosting cycle of an inverter refrigerator. The method for determining the defrosting cycle of an inverter refrigerator is described below:

[0059] For example, after a refrigerator has been running for a period of time, the frost layer on the evaporator becomes thicker, which affects the cooling effect. Therefore, refrigerators usually need to be designed with an automatic defrosting function. Accurately determining when to start defrosting is one of the key technologies for achieving energy saving and reliable cooling in air-cooled inverter refrigerators. Currently, a fixed time is preset to determine whether defrosting is needed. When the refrigerator is working, a timer records the cumulative running time of the refrigerator compressor. When the cumulative running time of the refrigerator compressor is greater than or equal to the preset fixed time, the refrigerator performs a defrosting operation, then the timer is reset and the recording of the cumulative running time of the refrigerator compressor restarts. Defrosting is performed on a timed basis.

[0060] However, the rate at which frost builds up on a refrigerator evaporator is influenced not only by the compressor's cumulative running time, the number of times the door is opened and closed, and the duration the door is open, but also by various factors such as user habits, ambient temperature and humidity, and the condition of the refrigerator door seal. Frequent door openings allow warm, humid air to enter the refrigerator, increasing the thickness of the frost layer on the evaporator surface. Simply relying on timed defrosting operations cannot flexibly adjust to the compressor's operating status, leading to reduced cooling efficiency and increased energy consumption.

[0061] like Figure 1 The diagram shown is a flowchart of the method for determining the defrosting cycle of a variable frequency refrigerator in this application.

[0062] This application provides a method for determining the defrosting cycle of a variable frequency refrigerator, including the following steps:

[0063] Before the step of obtaining the refrigerator's operating parameters, the following steps are included:

[0064] S90: If the refrigerator is in the initial power-on state, the step of obtaining the refrigerator's operating parameters will be executed after the refrigerator has been powered on for six preset times.

[0065] It's understandable that after a refrigerator is first powered on, the refrigeration system (including the compressor, condenser, evaporator, etc.) needs time to operate and coordinate to achieve optimal cooling. During this time, the various components of the refrigeration system gradually enter working mode, preparing for the subsequent cooling process. The internal temperature of the refrigerator gradually decreases during the operation of the refrigeration system. To ensure a stable and uniform internal temperature, it's necessary to wait a while before turning on the cooling function. For refrigerators with a defrosting function, the defrosting process usually occurs automatically after the refrigeration system has been running for a period of time. Therefore, waiting a while after the refrigerator is first powered on also ensures that the defrosting system has sufficient time to prepare and start. In conclusion, to ensure the normal operation of the refrigeration system, it's necessary to wait a while after the refrigerator is first powered on before turning on the cooling and defrosting functions.

[0066] In this embodiment, the defrosting function is not in normal operation after the refrigerator is first powered on. Therefore, it is impossible to determine whether to turn the defrosting function on or off based on the refrigerator's operating parameters at the moment of power-on. Therefore, this application sets the step of acquiring the refrigerator's operating parameters after a sixth preset time has elapsed since the refrigerator was first powered on, in preparation for subsequently determining whether the defrosting function is activated. The sixth preset time can be selected as 12 hours.

[0067] S100: Obtain refrigerator operating parameters; the refrigerator operating parameters include: compressor operating time at different frequencies, compressor speed, and refrigerator door opening time; different compressor speeds correspond to different compressor operating times at different frequencies. Refrigerators generally have fixed compressor speed settings. In this application, the compressor speed at different settings and the corresponding compressor operating time at different compressor speeds are obtained. The refrigerator door opening time includes the opening time of all doors. For example, if the refrigerator compartment door and the freezer compartment door are opened simultaneously, the opening time of both doors is recorded. The door opening time is obtained through door opening and closing.

[0068] There is a correlation between the cumulative operating time of the compressor and the evaporator frosting time. Evaporator frosting is the result of a combination of factors, including but not limited to compressor operating time, refrigerant circulation volume, evaporator design, and environmental conditions (such as temperature and humidity). When the compressor operates for an extended period, the refrigerant circulation volume in the system increases, which may lead to a decrease in the temperature of the evaporator surface, thereby increasing the risk of frosting.

[0069] The compressor speed directly affects the refrigerant compression efficiency and pressure changes within the system. As the compressor speed increases, its refrigerant compression capacity increases, leading to a decrease in refrigerant pressure in the evaporator and consequently a drop in evaporation temperature. The evaporator surface temperature is a key factor influencing the frosting rate. When the evaporator surface temperature drops below freezing, water vapor in the air condenses and freezes on the evaporator surface, forming a frost layer. Therefore, the lower the evaporator surface temperature, the faster the frosting rate. Since the compressor speed directly affects the evaporator temperature, it also significantly impacts the frosting rate. Increased compressor speed lowers the evaporation temperature, thus accelerating frosting on the evaporator surface. Conversely, decreased compressor speed raises the evaporation temperature, slowing down frosting. In summary, the cumulative operating time of the compressor is approximately equal to the evaporator's frosting time; higher speed corresponds to lower evaporator temperature and faster frosting on the evaporator surface. Therefore, this application uses compressor speed to determine the degree of frost formation in the refrigerator.

[0070] S200: Based on the compressor speed, the operating time of the compressor at different frequencies is corrected to obtain the compressor operating time correction value; the correction calculation of the compressor's cumulative working time, in this embodiment, takes the compressor speed of 3000 rpm as the benchmark. When the speed exceeds this, the cumulative working time increases; when the speed is lower than this, the cumulative working time decreases.

[0071] The step of correcting the compressor's operating time at different frequencies based on the compressor's rotational speed to obtain a corrected compressor operating time value includes the following sub-steps:

[0072] S210: Based on the compressor speed, obtain the speed correction coefficient; the speed correction coefficient is determined by the following formula:

[0073] k = P ÷ n;

[0074] In the formula, k is the speed correction coefficient; P is the compressor speed; n is the compressor speed setting reference value; wherein, the compressor speed setting reference value can be selected as 3000 rpm.

[0075] S220: Based on the correction coefficient and the compressor's operating time at different frequencies, a compressor operating time correction value is obtained; the compressor operating time correction value is determined by the following formula:

[0076] t y =P×t n ;

[0077] In the formula, t y This is a correction value for compressor running time, in minutes; t n This refers to the operating time of the compressor at different frequencies.

[0078] Specifically, the compressor's operating time at speed P1 is t1, its operating time at speed P2 is t2, its operating time at speed P3 is t3, and its operating time at speed P... n Running time t at rotational speed n The compressor running time correction value is then:

[0079] t y =(P1÷3000)×t1+(P2÷3000)×t2+(P3÷3000)×t3+...+(P n ÷3000)×t n .

[0080] S300: Correct the refrigerator door opening time to obtain a corrected value. It's worth noting that when users frequently open the refrigerator door, warm, humid air from outside enters the refrigerator. This warm, humid air easily condenses into water droplets after cooling inside the refrigerator, leading to frost formation. The duration of the door opening also affects the amount of frost; prolonged opening allows more outside air to enter the refrigerator, increasing the likelihood of frost formation. In summary, the refrigerator door opening time has a significant impact on frost formation. The refrigerator's cooling sequence is typically alternating between the refrigerator compartment and the freezer compartment.

[0081] The step of correcting the refrigerator door opening time to obtain a corrected refrigerator door opening time value includes the following sub-steps:

[0082] S310: Determine the door opening time correction coefficient; the value of the door opening time correction coefficient is in the range of 30 to 100, and is used to convert the refrigerator door opening time into the evaporator frosting time.

[0083] S320: Based on the refrigerator door opening time and the opening time correction coefficient, the refrigerator door opening time correction value is obtained; the refrigerator door opening time correction value is determined by the following formula:

[0084] t m = a × t1 ÷ 60;

[0085] In the formula, t m t1 is the refrigerator door opening time correction value, in minutes; a is the door opening time correction coefficient; t1 is the refrigerator door opening time.

[0086] Specifically, t m = a × (Cumulative door opening time of refrigeration unit + Cumulative door opening time of variable temperature unit + Cumulative door opening time of freezer unit) ÷ 60; where the door opening time is obtained in seconds. (If the refrigerator has multiple doors, the opening time of each door is included in the calculation of the refrigerator door opening time.)

[0087] S400: Based on the compressor running time correction value and the refrigerator door opening time correction value, the evaporator frosting time is obtained; the evaporator frosting time is determined by the following formula:

[0088] t e =t y +t m ;

[0089] In the formula, t e This refers to the evaporator frosting time. The evaporator frosting time is equal to the sum of the refrigerator door opening time correction value and the compressor running time correction value.

[0090] S500: When the evaporator frosts for a duration greater than or equal to a first preset time, a defrosting operation is performed after the compressor stops running.

[0091] The step of performing defrosting after the compressor stops running when the evaporator frosts for a duration greater than or equal to a first preset time includes the following sub-steps:

[0092] S510: When the evaporator frosting time is greater than or equal to the first preset time, determine whether the compressor running time is greater than the second preset time; the second preset time is greater than the first preset time; the first preset time can be selected as 48h or 49h.

[0093] S520: If so, control the compressor to stop running and perform defrosting operation.

[0094] Specifically, when the frost duration of the evaporator is ≥ 48h, the defrosting operation of the refrigerator will be started after the compressor stops running. If the frost duration of the evaporator has reached 48h, and the waiting time is > 1h (that is, the cumulative frost duration has met the requirement of 48h, but the compressor is still running and has not stopped running after 1h), the compressor will be forcibly stopped and the defrosting process will be started directly.

[0095] The refrigerator operating parameters also include: the first temperature value and the second temperature value of the evaporator when the refrigerator compartment and the freezer compartment stop cooling.

[0096] The method further includes the following steps:

[0097] S600: Obtain the real-time temperature value of the evaporator after the third preset time following the defrosting operation; the third preset time can be selected as 12h.

[0098] S700: Based on the first temperature value and the second temperature value, obtain a first temperature reference value and a second temperature reference value; the step of obtaining the first temperature reference value and the second temperature reference value based on the first temperature value and the second temperature value includes the following sub-steps:

[0099] S710: Determine the temperature correction factor ΔT; the optimal range of the temperature correction factor is 1℃ to 4℃.

[0100] S720: Based on the temperature correction coefficient, a first temperature reference value and a second temperature reference value are obtained based on the first temperature value and the second temperature value.

[0101] The first temperature reference value is determined by the following formula:

[0102] T1 = T ce -ΔT;

[0103] In the formula, T1 is the first temperature reference value; T ce The first temperature value is ΔT; ΔT is the temperature correction factor.

[0104] The second temperature reference value is determined by the following formula:

[0105] T2 = T de -ΔT;

[0106] In the formula, T2 is the second temperature reference value; T de This is the second temperature value.

[0107] S800: When the refrigerator compartment is in cooling mode, if the real-time temperature value is less than or equal to the first temperature reference value, the compressor is controlled to stop running and a defrosting operation is performed; specifically, in the refrigerator compartment cooling mode, when the real-time temperature value T of the evaporator .... e ≤T ce When -ΔT is reached, the compressor immediately stops running and performs a defrosting operation.

[0108] S900: When the freezer compartment is in cooling mode, if the real-time temperature value is less than or equal to the second temperature reference value, the compressor is controlled to stop running and a defrosting operation is performed. Specifically, in the freezer compartment cooling mode, when the real-time temperature value T of the evaporator is less than or equal to the second temperature reference value... e ≤T de When -ΔT is reached, the compressor immediately stops running and performs a defrosting operation.

[0109] Following the step of obtaining the real-time temperature value of the evaporator after the third preset time following the defrosting operation, the method further includes the following steps:

[0110] S610: If the refrigerator is in the cooling state after the first defrost operation, and the refrigerator compartment and freezer compartment are in the cooling state after the third preset time, then the first temperature value and the second temperature value are determined as the first preset value and the second preset value; specifically, if no valid values ​​of the first temperature value and the second temperature value are obtained within 12 hours (i.e., the first cooling cycle after defrost has not met the conditions for stopping cooling in the refrigerator or freezing compartment), then the first temperature value and the second temperature value are used as the conditions for subsequent defrosting judgment according to the first preset value and the second preset value. The first preset value can be selected as -28℃, and the second preset value can be selected as -34℃.

[0111] S620: Based on the first preset value and the second preset value, obtain a first temperature reference value and a second temperature reference value; specifically, the first temperature reference value T1 = -28 - ΔT; the second temperature reference value T2 = -34 - ΔT.

[0112] S630: If the real-time temperature value is less than or equal to the first temperature reference value, and the duration is greater than or equal to the fourth preset time, then control the compressor to stop running and perform a defrosting operation; the fourth preset time can be selected as 10 minutes.

[0113] S640: If the real-time temperature value is less than or equal to the second temperature reference value, and the duration is greater than or equal to the fourth preset time, then the compressor is controlled to stop running and a defrosting operation is performed. The principle behind determining whether to perform a defrosting operation based on the evaporator temperature is as follows: When the evaporator frost layer is thick, the fan cannot carry the evaporator's cooling energy into each compartment of the refrigerator. At this time, the evaporator temperature will be significantly lower than the temperature during normal cooling. Therefore, when the evaporator temperature is low, it indicates that the frost layer on the evaporator surface is thick, and a defrosting operation is needed to remove the frost layer.

[0114] The method further includes the following steps:

[0115] S1000: If the refrigerator remains in cooling mode for a period longer than a fifth preset time, the compressor is stopped and a defrosting operation is performed. The fifth preset time is greater than the first, second, third, and fourth preset times. Specifically, if the above conditions are not triggered, this application sets a maximum defrosting cycle protection time, i.e., the fifth preset time, which can be selected from 72 hours to 96 hours. If the refrigerator's cooling time reaches the fifth preset time, the compressor is stopped and a defrosting operation is performed.

[0116] It is worth noting that after the refrigerator enters the defrosting process, the compressor's cumulative working time is reset to zero, and the door opening time during the defrosting period is not included in the total time. Once the refrigerator compressor starts working again, the timing of the compressor's cumulative working time, door opening time, and natural time will restart.

[0117] This application utilizes the existing refrigeration and control system of a refrigerator to provide a method for determining the defrosting cycle of a variable frequency refrigerator without adding any additional parts. The control method is simple, the control rules are highly applicable, and the product design and development cycle is short. It can accurately determine the evaporator frost thickness and initiate defrosting when necessary, ensuring the reliability of the refrigerator's defrosting process while reducing the refrigerator's operating energy consumption.

[0118] This application provides a method for determining the defrosting cycle of a variable frequency refrigerator, which includes three defrosting operation judgment conditions:

[0119] 1. By collecting the actual working time of the inverter refrigerator compressor at different frequencies, calculate the corrected cumulative working time of the compressor; collect the refrigerator door opening time, and obtain the cumulative frost time of the evaporator by combining the corrected cumulative working time of the compressor and the refrigerator door opening time; determine whether the refrigerator has performed a defrosting operation by using the cumulative frost time of the evaporator.

[0120] 2. By collecting the evaporator temperature at the moment when the refrigerator compartment stops cooling and the freezer compartment stops cooling, the refrigerator compartment temperature reference value and the freezer compartment temperature reference value are obtained through the evaporator temperature. Finally, using the real-time value of the evaporator temperature, the refrigerator compartment temperature reference value, and the freezer compartment temperature reference value, it is determined whether the refrigerator has performed a defrosting operation.

[0121] 3. Set the longest defrost cycle protection time to ensure that the refrigerator can perform the defrost operation normally if neither judgment condition one nor judgment condition two is met.

[0122] This application provides a method for determining the defrosting cycle of a variable frequency refrigerator. It indirectly obtains the evaporator frost thickness by measuring compressor speed and evaporator temperature, thereby initiating defrosting when necessary. This ensures reliable defrosting while reducing energy consumption, preventing excessive frost from affecting the refrigerator's cooling performance. Thick frost significantly reduces cooling efficiency, making it difficult to reach ideal internal temperatures. This not only damages food freshness and taste but may also lead to spoilage. Furthermore, frost occupies internal space, reducing the refrigerator's effective volume and further impacting cooling efficiency. This method also avoids increased power consumption due to thick frost.

[0123] A thick layer of frost not only increases the burden on the compressor but can also cause moisture to accumulate in the refrigerator's internal circuitry and components, leading to electrical malfunctions. Over time, this can shorten the refrigerator's lifespan. Furthermore, frequent start-stop cycles can cause the compressor to wear out prematurely. The moist surface of the frost layer also provides a breeding ground for bacteria. Once the frost melts, bacteria can seep into the food with the melted water, causing cross-contamination and posing a threat to food safety. Timely cleaning of the frost layer can prevent these problems and extend the refrigerator's lifespan.

[0124] The above detailed embodiments further illustrate the purpose, technical solution, and beneficial effects of the embodiments of this application. It should be understood that the above are merely specific embodiments of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solutions of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A method for determining the defrosting cycle of a variable frequency refrigerator, characterized in that, include: Obtain refrigerator operating parameters; The refrigerator operating parameters include: compressor operating time at different frequencies, compressor speed, and refrigerator door opening time. Based on the compressor speed, the operating time of the compressor at different frequencies is corrected to obtain the compressor operating time correction value; The refrigerator door opening time is corrected to obtain a refrigerator door opening time correction value; Based on the compressor running time correction value and the refrigerator door opening time correction value, the evaporator frosting time is obtained; When the evaporator frosts for a duration greater than or equal to a first preset time, a defrosting operation is performed after the compressor stops running.

2. The method for determining the defrosting cycle of a variable frequency refrigerator according to claim 1, characterized in that, The step of correcting the compressor's operating time at different frequencies based on the compressor's rotational speed to obtain a corrected compressor operating time value includes: Based on the compressor speed, a speed correction coefficient is obtained; the speed correction coefficient is determined by the following formula: k = P ÷ n; In the formula, k is the speed correction coefficient; P is the compressor speed; and n is the compressor speed setting reference value. Based on the correction coefficient and the compressor's operating time at different frequencies, a compressor operating time correction value is obtained; the compressor operating time correction value is determined by the following formula: t y =P×t n ; In the formula, t y This is the compressor running time correction value; t n This refers to the operating time of the compressor at different frequencies.

3. The method for determining the defrosting cycle of a variable frequency refrigerator according to claim 1, characterized in that, The step of correcting the refrigerator door opening time to obtain a corrected refrigerator door opening time value includes: Determine the correction factor for door opening time; Based on the refrigerator door opening time and the opening time correction coefficient, the refrigerator door opening time correction value is obtained; the refrigerator door opening time correction value is determined by the following formula: t m =a×t1÷60; In the formula, t m t1 is the refrigerator door opening time correction value; 'a' is the door opening time correction coefficient; t1 is the refrigerator door opening time.

4. The method for determining the defrosting cycle of a variable frequency refrigerator according to claim 1, characterized in that, The evaporator frosting time is determined by the following formula: t e =t y +t m ; In the formula, t e This refers to the evaporator frosting time.

5. The method for determining the defrosting cycle of a variable frequency refrigerator according to claim 1, characterized in that, The step of performing a defrosting operation after the compressor stops running when the evaporator frosts for a duration greater than or equal to a first preset time includes: When the evaporator frosting time is greater than or equal to a first preset time, it is determined whether the compressor running time is greater than a second preset time; the second preset time is greater than the first preset time. If so, the compressor will stop running and a defrosting operation will be performed.

6. The method for determining the defrosting cycle of a variable frequency refrigerator according to claim 1, characterized in that, The refrigerator operating parameters also include: the first temperature value and the second temperature value of the evaporator when the refrigerator compartment and the freezer compartment stop cooling; The method further includes: Obtain the real-time temperature value of the evaporator after the third preset time following the defrosting operation; Based on the first temperature value and the second temperature value, a first temperature reference value and a second temperature reference value are obtained; When the refrigerator compartment is in cooling mode, if the real-time temperature value is less than or equal to the first temperature reference value, the compressor is controlled to stop running and a defrosting operation is performed. When the freezer compartment is in cooling mode, if the real-time temperature value is less than or equal to the second temperature reference value, the compressor is controlled to stop running and a defrosting operation is performed.

7. The method for determining the defrosting cycle of a variable frequency refrigerator according to claim 6, characterized in that, The step of obtaining a first temperature reference value and a second temperature reference value based on the first temperature value and the second temperature value includes: Determine the temperature correction factor; Based on the temperature correction coefficient, a first temperature reference value and a second temperature reference value are obtained based on the first temperature value and the second temperature value. The first temperature reference value is determined by the following formula: T1=T ce -ΔT; In the formula, T1 is the first temperature reference value; T ce The first temperature value is ΔT; ΔT is the temperature correction factor. The second temperature reference value is determined by the following formula: T2=T de -ΔT; In the formula, T2 is the second temperature reference value; T de This is the second temperature value.

8. The method for determining the defrosting cycle of a variable frequency refrigerator according to claim 6, characterized in that, After the step of obtaining the real-time temperature value of the evaporator after the third preset time following the defrosting operation, the method further includes: If the refrigerator is in the cooling state after the first defrosting operation, and the refrigerator compartment and the freezer compartment are in the cooling state after the third preset time, then the first temperature value and the second temperature value are determined as the first preset value and the second preset value. Based on the first preset value and the second preset value, a first temperature reference value and a second temperature reference value are obtained; If the real-time temperature value is less than or equal to the first temperature reference value, and the duration is greater than or equal to the fourth preset time, then the compressor is controlled to stop running and a defrosting operation is performed. If the real-time temperature value is less than or equal to the second temperature reference value, and the duration is greater than or equal to the fourth preset time, then the compressor is controlled to stop running and a defrosting operation is performed.

9. The method for determining the defrosting cycle of a variable frequency refrigerator according to claim 1, characterized in that, The method further includes: If the refrigerator remains in cooling mode for a period of time longer than the fifth preset time, the compressor will be stopped and a defrosting operation will be performed. The fifth preset time is longer than the first preset time, the second preset time, the third preset time, and the fourth preset time.

10. The method for determining the defrosting cycle of a variable frequency refrigerator according to claim 1, characterized in that, Before the step of obtaining the refrigerator's operating parameters, the following steps are included: If the refrigerator is being powered on for the first time, the step of obtaining the refrigerator's operating parameters will be executed after the refrigerator has been powered on for the sixth preset time.

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