Air-cooled refrigerator control method and system

Abstract

The invention provides an air-cooled refrigerator control method and system. The method comprises the steps that the environment temperature average value and the air return pipe temperature average value within first preset time are obtained; based on the ambient temperature average value, according to a return air thermometer, obtaining return air temperature; the air return pipe temperature difference is obtained based on the air return pipe temperature average value and the air return temperature; obtaining an execution instruction based on the air return pipe temperature difference; the execution instruction comprises whether a refrigeration compensation heater is started or not and the rotating speed of a compressor and the rotating speed of a freezing fan; and the air-cooled refrigerator is controlled to run according to the execution instruction, so that the freezing chamber reaches the target temperature, and the problems that the refrigeration effect of the freezing chamber is affected and the overall energy consumption of the refrigerator is increased due to the fact that an existing air-cooled refrigerator cannot sense the change of the temperature of the freezing chamber and cannot adjust the control logic in time and rapidly cool the freezing chamber are solved.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, and in particular to a method and system for controlling an air-cooled refrigerator. Background Art

[0002] Among the many types of refrigerators, low-cost single-system air-cooled refrigerators have occupied a certain share of the market due to their economical and simple structure. This type of refrigerator usually uses a refrigeration sensor to control the operation of the compressor to achieve temperature regulation in the refrigerator compartment. However, in order to reduce costs, the freezer compartment is not equipped with a compartment sensor and door switch, resulting in the freezer compartment being unable to achieve independent temperature control like the refrigerator compartment, but passively cooling along with the refrigerator compartment.

[0003] The finned evaporator of the refrigerator is usually placed in the freezer compartment, and the cold air is sent to each compartment through the refrigeration fan. The refrigerator compartment and the freezer compartment are directly connected through the air cavity, or a manual damper is set in the air path to adjust the air supply from the freezer to the refrigeration compartment.

[0004] When a heat load is placed in the refrigerator, the refrigeration sensor can quickly sense the temperature change, adjust the control logic in time, and start the compressor for refrigeration, thereby keeping the temperature of the refrigerator stable. However, when the freezer door is opened and a heat load is placed, since there is no sensor in the freezer, the system cannot sense the temperature change in a short time, and therefore cannot adjust the control logic in time to quickly cool the freezer, which not only affects the refrigeration effect of the freezer, but may also increase the overall energy consumption of the refrigerator. Summary of the invention

[0005] The present application provides an air-cooled refrigerator control method and system to solve the technical problem that the existing air-cooled refrigerator cannot sense the change of the freezer temperature, and therefore cannot adjust the control logic in time to quickly cool the freezer, which not only affects the refrigeration effect of the freezer, but also leads to an increase in the overall energy consumption of the refrigerator.

[0006] The first aspect of the present application provides an air-cooling refrigerator control method, comprising:

[0007] Obtaining the average value of the ambient temperature and the average value of the return air pipe temperature within the first preset time;

[0008] Based on the average value of the ambient temperature, the return air temperature is obtained according to the return air temperature table;

[0009] Based on the average return air pipe temperature and the return air temperature, a return air pipe temperature difference is obtained;

[0010] Based on the return air pipe temperature difference, an execution instruction is obtained; the execution instruction includes: whether the refrigeration compensation heater is turned on, and the speed of the compressor and the refrigeration fan;

[0011] The air-cooled refrigerator is controlled to operate according to the execution instruction so that the freezing chamber reaches the target temperature.

[0012] In some embodiments, the step of obtaining the return air temperature based on the average ambient temperature according to a return air temperature table includes:

[0013] If the average ambient temperature is less than or equal to the first temperature value, the first return air temperature is:

[0014] T c1 =T h -1.5;

[0015] Where, T h is the average ambient temperature;

[0016] If the average ambient temperature is greater than the first temperature value and less than or equal to the second temperature value, the second return air temperature is:

[0017] T c2 =T h -2;

[0018] If the average ambient temperature is greater than the second temperature value, the third return air temperature is:

[0019] T c3 =T h -2.5.

[0020] In some embodiments, the step of acquiring an execution instruction based on the return air pipe temperature difference includes:

[0021] If the return air pipe temperature difference is less than the third temperature value, the air-cooled refrigerator is controlled to operate according to the preset instructions so that the freezing chamber reaches the target temperature.

[0022] In some embodiments, the step of acquiring an execution instruction based on the return air pipe temperature difference further includes:

[0023] If the return air pipe temperature difference is greater than or equal to the third temperature value and the duration is greater than the second preset time, determining the most recently acquired first return air pipe temperature difference;

[0024] If the first return air pipe temperature difference is greater than or equal to the third temperature value and less than the fourth temperature value, the speed of the compressor is controlled to increase according to the first speed, and the refrigeration fan is controlled to decrease according to the second speed, and after running for a third preset time, the second return air pipe temperature difference within the first preset time is obtained;

[0025] Based on the second return air pipe temperature difference, an execution instruction is obtained.

[0026] In some embodiments, the step of acquiring an execution instruction based on the return air pipe temperature difference further includes:

[0027] If the return air pipe temperature difference is greater than or equal to the third temperature value and the duration is greater than the second preset time, determining the most recently acquired first return air pipe temperature difference;

[0028] If the first return air pipe temperature difference is greater than or equal to the fourth temperature value and less than the fifth temperature value, the speed of the compressor is controlled to increase according to the third speed, and the refrigeration fan is controlled to decrease according to the fourth speed, and after running for a fourth preset time, the second return air pipe temperature difference within the first preset time is obtained;

[0029] Based on the second return air pipe temperature difference, an execution instruction is obtained.

[0030] In some embodiments, the step of acquiring an execution instruction based on the second return air pipe temperature difference includes:

[0031] If the temperature difference of the second air return pipe is less than the third temperature value, the air-cooled refrigerator is controlled to operate according to the preset instructions so that the freezing chamber reaches the target temperature.

[0032] In some embodiments, the step of acquiring an execution instruction based on the second return air pipe temperature difference includes:

[0033] If the temperature difference of the second return air pipe is greater than or equal to the third temperature value and less than the fourth temperature value, repeatedly control the speed of the compressor to increase according to the first speed, control the refrigeration fan to decrease according to the second speed, and after running for the third preset time, obtain the temperature difference of the second return air pipe within the first preset time, and based on the second return air pipe temperature difference, obtain the execution instruction step until the temperature difference of the second return air pipe is less than the third temperature value.

[0034] In some embodiments, the step of acquiring an execution instruction based on the second return air pipe temperature difference includes:

[0035] If the temperature difference of the second return air pipe is greater than or equal to the fourth temperature value and less than the fifth temperature value, repeatedly control the speed of the compressor to increase according to the third speed, control the refrigeration fan to decrease according to the fourth speed, and after running for the fourth preset time, obtain the temperature difference of the second return air pipe within the first preset time, and based on the second return air pipe temperature difference, obtain the execution instruction step until the temperature difference of the second return air pipe is less than the third temperature value.

[0036] In some embodiments, the step of acquiring an execution instruction based on the second return air pipe temperature difference includes:

[0037] If the temperature difference of the second return air pipe is greater than or equal to the fifth temperature value, the speed of the compressor is controlled to run according to the set maximum speed, the refrigeration fan is controlled to reduce to the fifth speed, and the refrigeration compensation heater is controlled to turn on until the temperature difference of the second return air pipe is less than the third temperature value.

[0038] A second aspect of the present application provides an air-cooled refrigerator control system, comprising:

[0039] Set in the box:

[0040] Control module;

[0041] And, an ambient temperature acquisition module, a return air pipe temperature acquisition module, a refrigeration compensation heater, a compressor and a refrigeration fan connected to the control module; the ambient temperature acquisition module is used to obtain the ambient temperature, and the return air pipe temperature acquisition module is used to obtain the return air pipe temperature;

[0042] The control module is configured to:

[0043] Obtaining the average value of the ambient temperature and the average value of the return air pipe temperature within the first preset time;

[0044] Based on the average value of the ambient temperature, the return air temperature is obtained according to the return air temperature table;

[0045] Based on the average return air pipe temperature and the return air temperature, a return air pipe temperature difference is obtained;

[0046] Based on the return air pipe temperature difference, an execution instruction is obtained; the execution instruction includes: whether the refrigeration compensation heater is turned on, and the speeds of the compressor and the refrigeration fan;

[0047] The air-cooled refrigerator is controlled to operate according to the execution instruction so that the freezing chamber reaches the target temperature.

[0048] The present application provides an air-cooled refrigerator control method and system, the method comprising: obtaining an average value of the ambient temperature and an average value of the return air duct temperature within a first preset time; obtaining the return air temperature based on the average value of the ambient temperature according to a return air temperature table; obtaining the return air duct temperature difference based on the average value of the return air duct temperature and the return air temperature; obtaining an execution instruction based on the return air duct temperature difference; the execution instruction comprises: whether a refrigeration compensation heater is turned on, and the rotation speeds of a compressor and a refrigeration fan; controlling the air-cooled refrigerator to operate according to the execution instruction so that the freezer chamber reaches a target temperature, so as to solve the problem that the current air-cooled refrigerator cannot sense the change in the freezer chamber temperature, and therefore cannot adjust the control logic in time to quickly realize the cooling of the freezer chamber, which not only affects the refrigeration effect of the freezer chamber, but also leads to an increase in the overall energy consumption of the refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0050] Figure 1 This is a flow chart of the air-cooling refrigerator control method in this application. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0052] In some technologies, an air-cooled refrigerator cannot sense changes in the temperature of the freezer compartment, and therefore cannot adjust the control logic in time to quickly cool the freezer compartment, which not only affects the refrigeration effect of the freezer compartment, but also increases the overall energy consumption of the refrigerator. In order to solve this technical problem, the present application provides an air-cooled refrigerator control method and system. The air-cooled refrigerator control method and system are described below:

[0053] For example, air-cooled refrigerators usually use refrigeration sensors to control the operation of the compressor to achieve temperature regulation in the refrigeration chamber. However, in order to reduce costs, the freezer compartment is not equipped with a compartment sensor and a door switch. This means that the freezer compartment cannot achieve independent temperature control like the refrigeration chamber, but passively follows the refrigeration chamber to cool down.

[0054] Specifically, the finned evaporator of an air-cooled refrigerator is usually placed in the freezer, and the cold air is sent to each compartment through the refrigeration fan. The cold storage room and the freezer are directly connected through the air cavity, or a manual damper is set in the air path to adjust the air supply from the freezer to the cold storage room. When a heat load (such as food with a high temperature) is placed in the cold storage room, the cold storage sensor can quickly sense the temperature change, adjust the control logic in time, and start the compressor for refrigeration, thereby keeping the temperature of the cold storage room stable. However, when the freezer door is opened and a heat load is placed, since there is no sensor in the freezer, the system cannot sense the temperature change in a short time, and therefore cannot adjust the control logic in time to quickly cool the freezer. This hysteresis in temperature control not only affects the refrigeration effect of the freezer, but may also lead to an increase in the overall energy consumption of the refrigerator. Because when the temperature of the freezer rises, in order to maintain the temperature of the cold storage room stable, the compressor may need to run for a longer time and at a higher power. This not only increases the energy consumption of the refrigerator, but may also have an adverse effect on the service life of the refrigerator.

[0055] like Figure 1 Shown is a flow chart of the air-cooling refrigerator control method in this application.

[0056] For example, when a heat load is placed in a room of the refrigerator, the air circulation causes the heat exchange at the fin evaporator to increase (the amount of liquid refrigerant evaporating increases), and the liquid refrigerant returning to the compressor decreases, causing the return air pipe temperature to increase.

[0057] Based on the above principles, the first aspect of the present application provides a method for controlling an air-cooled refrigerator, comprising the following steps:

[0058] S100: Obtain the average value of the ambient temperature and the average value of the return air pipe temperature within the first preset time; the average value of the ambient temperature is collected by the ambient temperature sensor, and the average value of the ambient temperature is obtained by collecting the ambient temperature; the average value of the return air pipe temperature is collected by the return air pipe temperature sensor, and the average value of the return air pipe temperature is obtained by collecting the return air pipe temperature. Among them, the first preset time can be selected as 10 minutes.

[0059] It is worth noting that when the refrigerator's cumulative refrigeration time reaches 6 hours, the compressor is turned on for the first time after non-defrosting, and the compressor has been running for 10 minutes at a time, the temperature collection work can be carried out. The refrigerator will be stationary for a period of time after power-on to protect the compressor, ensure the refrigerator's refrigeration effect, and extend the service life of the refrigerator.

[0060] Exemplarily, the control module obtains the return air duct temperature and the ambient temperature every 10 minutes, and obtains the average return air duct temperature and the average ambient temperature based on the return air duct temperature and the ambient temperature.

[0061] S200: Based on the average value of the ambient temperature and according to a return air temperature table, a return air temperature is obtained; wherein the return air temperature table is shown in the following table:

[0062] <![CDATA[Ambient temperature range T h > <![CDATA[T h ≤20℃]]> <![CDATA[20℃<T h ≤35℃]]> <![CDATA[T h >35℃]]> <![CDATA[Return air temperature T c > <![CDATA[T h -1.5]]> <![CDATA[T h -2]]> <![CDATA[T h -2.5]]>

[0063] The step of obtaining the return air temperature based on the average value of the ambient temperature according to the return air temperature table comprises the following sub-steps:

[0064] S210: If the average ambient temperature is less than or equal to the first temperature value, the first return air temperature is:

[0065] T c1 =T h -1.5;

[0066] Where, T h is the average ambient temperature;

[0067] S220: If the average ambient temperature is greater than the first temperature value and less than or equal to the second temperature value, the second return air temperature is:

[0068] T c2 =T h -2;

[0069] S230: If the average ambient temperature is greater than the second temperature value, the third return air temperature is:

[0070] T c3 =T h -2.5.

[0071] S300: Based on the average return air pipe temperature and the return air temperature, obtain a return air pipe temperature difference; the return air pipe temperature difference=the average return air pipe temperature-the return air temperature.

[0072] S400: Based on the return air duct temperature difference, an execution instruction is obtained; the execution instruction includes: whether the refrigeration compensation heater is turned on, and the rotation speeds of the compressor and the refrigeration fan; through the return air duct temperature difference, it can be determined whether there is a load in the room, for example: a load with a higher temperature will increase the temperature in the room, so that the temperature in the room can be quickly reduced by increasing the compressor rotation speed.

[0073] The step of acquiring an execution instruction based on the return air pipe temperature difference comprises the following sub-steps:

[0074] S410: If the return air pipe temperature difference ΔT is less than the third temperature value N 1 ℃, the air-cooled refrigerator is controlled to operate according to the preset instructions to make the freezer reach the target temperature.

[0075] Among them, the preset instruction is that the refrigerator performs refrigeration work according to the factory settings, for example: the refrigerator operates according to the compressor and refrigeration fan speeds set corresponding to the temperatures of the refrigerator and freezer compartments, that is, when the return air pipe temperature difference △T is less than the third temperature value N 1 ℃, the air-cooled refrigerator controls the operation of the compressor and the refrigeration fan according to the factory-set rules and instructions to make the freezer compartment reach the target temperature.

[0076] The step of acquiring an execution instruction based on the return air pipe temperature difference further includes the following sub-steps:

[0077] S420: If the return air pipe temperature difference ΔT is greater than or equal to the third temperature value N 1 ℃, and the duration is greater than the second preset time, determine the latest acquired first return air pipe temperature difference; wherein, the second preset time can be selected as 30min.

[0078] In this embodiment, when the return air pipe temperature difference ΔT is greater than or equal to the third temperature value N1 ℃, and the duration is greater than 30min, it means that the freezer compartment is loaded with heat load, and the return air pipe temperature difference △T obtained last is determined as the first return air pipe temperature difference.

[0079] S430: If the first return air pipe temperature difference ΔT 1 Greater than or equal to the third temperature value N 1 ℃ and less than the fourth temperature value N 2 ℃, the speed of the compressor is controlled according to the first speed n 1 Improve, control the refrigeration fan to follow the second speed m 1 Reduce, run for the third preset time, and obtain the temperature difference of the second return air pipe within the first preset time; wherein, the third preset time can be selected as 30 minutes.

[0080] In this embodiment, when the first return air pipe temperature difference ΔT 1 Greater than or equal to the third temperature value N 1 ℃ and less than the fourth temperature value N 2 When ℃, the control module controls the speed of the compressor to be set according to the first speed n 1 Improve, and control the refrigeration fan to follow the second speed m 1 After 30 minutes of operation, the temperature difference of the return air pipe, i.e. the temperature difference of the second return air pipe, is reduced. 2 , readjust the refrigeration control logic of the refrigerator.

[0081] S440: Based on the second return air pipe temperature difference ΔT 2 , get the execution instruction.

[0082] The step of acquiring an execution instruction based on the return air pipe temperature difference further includes the following sub-steps:

[0083] S450: If the return air pipe temperature difference ΔT is greater than or equal to the third temperature value N 1 ℃, and the duration is greater than the second preset time, determine the latest acquired first return air pipe temperature difference; wherein, the second preset time can be selected as 30min.

[0084] S460: If the first return air pipe temperature difference ΔT 1 Greater than or equal to the fourth temperature value N 2 ℃ and less than the fifth temperature value N 3 ℃, the speed of the compressor is controlled according to the third speed n 2 Improve, control the refrigeration fan to follow the fourth speed m 2 Reduce, after running for the fourth preset time, obtain the temperature difference of the second return air pipe within the first preset time; the fourth preset time can be selected as 60 minutes.

[0085] In this embodiment, when the first return air pipe temperature difference ΔT 1 Greater than or equal to the fourth temperature value N 2 ℃ and less than the fifth temperature value N 3 ℃, the control module controls the speed of the compressor to follow the third speed n 2 Increase, and control the refrigeration fan to follow the fourth speed m 2 After 60 minutes of operation, the temperature difference of the return air pipe, i.e. the temperature difference of the second return air pipe, is reduced. 2 , readjust the refrigeration control logic of the refrigerator.

[0086] S470: Based on the second return air pipe temperature difference ΔT 2 , get the execution instruction.

[0087] The second return air pipe temperature difference ΔT 2 , the steps of obtaining the execution instruction include the following sub-steps:

[0088] S471: If the temperature difference of the second return air pipe △T 2 is less than the third temperature value N 1 ℃, the air-cooled refrigerator is controlled to operate according to the preset instructions to make the freezer reach the target temperature. The preset instructions are that the refrigerator performs refrigeration according to the factory settings, for example: the refrigerator operates according to the compressor and refrigeration fan speeds set corresponding to the temperatures of the refrigerator and freezer, that is, when the temperature difference of the second return air pipe △T 2 Less than the third temperature value N 1 ℃, the air-cooled refrigerator controls the operation of the compressor and the refrigeration fan according to the factory-set rules and instructions to make the freezer compartment reach the target temperature.

[0089] The second return air pipe temperature difference ΔT 2 , the step of obtaining the execution instruction also includes the following sub-steps:

[0090] S472: If the temperature difference of the second return air pipe △T 2 Greater than or equal to the third temperature value N 1 ℃ and less than the fourth temperature value N 2 ℃, then repeatedly control the speed of the compressor according to the first speed n 1 Improve, control the refrigeration fan to follow the second speed m 1 After the third preset time is run, the temperature difference △T of the second return air pipe within the first preset time is obtained. 2 , based on the second return air pipe temperature difference △T 2 , obtaining the step of executing the instruction until the temperature difference of the second return air pipe is less than the third temperature value.

[0091] In this embodiment, when the temperature difference ΔT of the second return air pipe is 2 Greater than or equal to the third temperature value N 1 ℃ and less than the fourth temperature value N 2 When ℃, the control module controls the speed of the compressor to be set according to the first speed n 1 Improve, and control the refrigeration fan to follow the second speed m 1 After 30 minutes of operation, determine the most recently obtained return air pipe temperature difference, i.e., the second return air pipe temperature difference △T 2 , readjust the refrigerator's refrigeration control logic. If the second return air pipe temperature difference △T 2 Greater than or equal to the third temperature value N 1 ℃ and less than the fourth temperature value N 2 ℃, then repeat the above steps until the temperature difference of the second return air pipe △T 2 is less than the third temperature value N 1 ℃, the air-cooled refrigerator is controlled to operate according to the preset instructions to make the freezer reach the target temperature.

[0092] The second return air pipe temperature difference ΔT 2 , the step of obtaining the execution instruction also includes the following sub-steps:

[0093] S473: If the temperature difference of the second return air pipe △T 2 Greater than or equal to the fourth temperature value N 2 ℃ and less than the fifth temperature value N 3 ℃, then repeatedly control the speed of the compressor according to the third speed n 2 Improve, control the refrigeration fan to follow the fourth speed m 2 After the fourth preset time is run, the temperature difference △T of the second return air pipe within the first preset time is obtained. 2 , based on the second return air pipe temperature difference △T 2 , obtaining the step of executing the instruction until the temperature difference of the second return air pipe is less than the third temperature value.

[0094] In this embodiment, when the temperature difference ΔT of the second return air pipe is 2 Greater than or equal to the fourth temperature value N 2 ℃ and less than the fifth temperature value N 3 ℃, the control module controls the speed of the compressor to follow the third speed n 2 Increase, and control the refrigeration fan to follow the fourth speed m 2 After 60 minutes of operation, determine the most recently obtained return air pipe temperature difference, i.e., the second return air pipe temperature difference △T 2 , readjust the refrigerator's refrigeration control logic. If the second return air pipe temperature difference △T 2Greater than or equal to the fourth temperature value N 2 ℃ and less than the fifth temperature value N 3 ℃, repeat the above steps. If the temperature difference of the second return air pipe is △T 2 Greater than or equal to the third temperature value N 1 ℃ and less than the fourth temperature value N 2 ℃, repeat the corresponding steps until the temperature difference of the second return air pipe △T 2 is less than the third temperature value N 1 ℃, the air-cooled refrigerator is controlled to operate according to the preset instructions to make the freezer reach the target temperature.

[0095] The step of acquiring an execution instruction based on the second return air pipe temperature difference comprises the following sub-steps:

[0096] S474: If the temperature difference of the second return air pipe △T 2 Greater than or equal to the fifth temperature value N 3 ℃, the compressor is controlled to run at the set maximum speed, and the refrigeration fan is controlled to run at the fifth speed m 3 Reduce, and control the refrigeration compensation heater to turn on until the second return air pipe temperature difference △T 2 is less than the third temperature value N 1 ℃. The set maximum speed of the compressor is the maximum speed allowed by the current ambient temperature.

[0097] It is worth noting that the compressor generates a large amount of heat energy during operation, which needs to be dissipated into the environment through the cooling system. The ambient temperature directly affects the cooling effect of the compressor. When the ambient temperature rises, the cooling effect of the compressor will decrease, causing the internal temperature of the compressor to rise. Therefore, the speed of the compressor cannot exceed the maximum speed allowed by the current ambient temperature to prevent damage to the compressor.

[0098] In this embodiment, when the temperature difference ΔT of the second return air pipe is 2 Greater than or equal to the fifth temperature value N 3 ℃, the control module controls the speed of the compressor to run according to the set maximum speed, and controls the refrigeration fan to run according to the fifth speed m 3 Reduce, and control the refrigeration compensation heater to turn on until the second return air pipe temperature difference △T 2 is less than the third temperature value N 1 ℃, the air-cooled refrigerator is controlled to operate according to the preset instructions to make the freezer reach the target temperature.

[0099] It is worth noting that, in order to prevent the temperature of the refrigerator compartment from being too low when cooling the freezer compartment, the present application is provided with a refrigeration compensation heater for heating the refrigerator compartment to prevent the temperature of the refrigerator compartment from being too low.

[0100] For example, the refrigeration fan speed is not allowed to be lower than 70% of the rated speed. The purpose is:

[0101] Ensure the operational stability of the fan: When the fan speed is lower than the rated speed, the fan's air volume and air pressure output will be reduced accordingly, and may not meet actual usage requirements. In addition, low speed can easily cause the fan to vibrate, increase noise, and affect the overall operational stability of the fan. Increased vibration and noise will not only reduce the service life of the fan, but may also interfere with the surrounding environment.

[0102] Optimize fan performance: When designing a fan, an optimal speed range is usually set to ensure that its performance is optimal. This optimal speed range usually corresponds to the rated speed of the fan. If the speed is lower than this range, the performance of the fan will be seriously affected, which may lead to problems such as reduced efficiency and increased energy consumption. Therefore, in order to maintain the optimal performance of the fan, it is necessary to ensure that the speed is not lower than the rated speed.

[0103] Avoid backflow or surge: When the refrigeration fan speed is lower than the rated speed, the outlet pressure may be difficult to maintain, which may easily cause backflow or surge. Backflow and surge are serious problems in fan operation and may cause fan damage or shutdown. Therefore, in order to avoid these problems, it is necessary to ensure that the fan speed is not lower than the rated speed.

[0104] Ensure safety: Low speed operation may cause increased wear of the fan's internal components and increase the risk of failure. In addition, if the fan runs for a long time at a speed lower than the rated speed, it may also cause safety problems such as overheating and overload. Therefore, in order to ensure the safety of the fan, it is necessary to ensure that the speed is not lower than the rated speed.

[0105] S500: Control the air-cooled refrigerator to run according to the execution instruction, so that the freezer reaches the target temperature. Intelligently judge the refrigerator load loading situation through the change of the return air pipe temperature, adjust the control logic in time, and realize rapid cooling of the freezer.

[0106] The present application provides a control method for an air-cooled refrigerator. The control method is simple and is aimed at a single-system air-cooled refrigerator without a freezing sensor and a freezing door switch. By detecting the ambient temperature and the return air pipe temperature when the compressor is turned on, the heat load of the freezer can be more accurately judged according to the temperature difference of the return air pipe; the control logic is adjusted in time to quickly reduce the temperature of the freezer.

[0107] The present application provides a method for controlling an air-cooled refrigerator, and the specific embodiments are as follows:

[0108] When the cumulative refrigeration time of the refrigerator reaches 6 hours, the compressor is turned on for the first time after defrosting, and the compressor has been running for 10 minutes at a time, the average temperature of the return air pipe T is taken every 10 minutes. c , according to the average ambient temperature T h Query the return air temperature table to obtain the return air temperature T corresponding to the refrigerator light load in this ambient temperature range c ', the return air pipe temperature difference △T=T c -T c '.

[0109] Condition 1: If △T<0.5℃, control the air-cooled refrigerator to operate according to the preset instructions so that the freezer compartment reaches the target temperature;

[0110] Condition 2: If △T ≥ 0.5℃ lasts for more than 30 minutes, the freezer compartment is judged to be loaded with heat load, and the control logic is adjusted according to the last △T value;

[0111] 1) If 0.5℃≤△T<1℃, the compressor speed of the air-cooled refrigerator is increased by 300r, and the refrigeration fan speed is reduced by 100r; after running for 30 minutes, according to the latest △T 1 Re-adjust the control logic of the refrigerator;

[0112] a) If △T 1 <0.5℃, control the air-cooled refrigerator to run according to the preset instructions to make the freezer reach the target temperature;

[0113] b) If 0.5℃≤△T 1 <1°C, execute the steps corresponding to condition 1;

[0114] c) If 1℃≤△T 1 <1.5℃, execute the steps corresponding to condition 2;

[0115] d) If △T 1 ≥1.5℃, execute the steps corresponding to condition 3;

[0116] 2) If 1℃≤△T 1 <1.5℃, the compressor speed of the air-cooled refrigerator is increased by 500r, and the refrigeration fan speed is reduced by 200r; after running for 60 minutes, according to the latest △T 2 Re-adjust the control logic of the refrigerator;

[0117] a) If △T 2 <0.5℃, control the air-cooled refrigerator to run according to the preset instructions to make the freezer reach the target temperature;

[0118] b) If 0.5℃≤△T 2 <1°C, execute the steps corresponding to condition 1;

[0119] c) If 1℃≤△T 2 <1.5℃, execute the steps corresponding to condition 2;

[0120] d) If △T 2 ≥1.5℃, execute the steps corresponding to condition 3;

[0121] Condition three: If △T≥1.5℃, the compressor speed of the air-cooled refrigerator is increased to the maximum speed allowed by the current ambient temperature, the refrigeration fan speed is reduced by 300r, and the refrigeration compensation heater is turned on and operated until △T<0.5℃, and then the air-cooled refrigerator is controlled to operate according to the preset instructions.

[0122] A second aspect of the present application provides an air-cooled refrigerator control system, comprising:

[0123] Set in the box:

[0124] Control module;

[0125] And, an ambient temperature acquisition module, a return air pipe temperature acquisition module, a refrigeration compensation heater, a compressor and a refrigeration fan connected to the control module; the ambient temperature acquisition module is used to obtain the ambient temperature, and the return air pipe temperature acquisition module is used to obtain the return air pipe temperature;

[0126] The control module is configured to:

[0127] Obtaining the average value of the ambient temperature and the average value of the return air pipe temperature within the first preset time;

[0128] Based on the average value of the ambient temperature, the return air temperature is obtained according to the return air temperature table;

[0129] Based on the average return air pipe temperature and the return air temperature, a return air pipe temperature difference is obtained;

[0130] Based on the return air pipe temperature difference, an execution instruction is obtained; the execution instruction includes: whether the refrigeration compensation heater is turned on, and the speeds of the compressor and the refrigeration fan;

[0131] The air-cooled refrigerator is controlled to operate according to the execution instruction so that the freezing chamber reaches the target temperature.

[0132] It is worth noting that the effects of the above system embodiment during operation can refer to the effects of the above method embodiment, which will not be described in detail here.

[0133] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A method for controlling an air-cooled refrigerator, characterized in that: include: Obtaining the average value of the ambient temperature and the average value of the return air pipe temperature within the first preset time; Based on the average value of the ambient temperature, the return air temperature is obtained according to the return air temperature table; Based on the average return air pipe temperature and the return air temperature, a return air pipe temperature difference is obtained; Based on the return air pipe temperature difference, obtaining an execution instruction; The execution instructions include: whether the refrigeration compensation heater is turned on, the speed of the compressor and the refrigeration fan; The air-cooled refrigerator is controlled to operate according to the execution instruction so that the freezing chamber reaches the target temperature.

2. The air-cooled refrigerator control method according to claim 1, characterized in that: The step of obtaining the return air temperature based on the average value of the ambient temperature and according to a return air temperature table comprises: If the average ambient temperature is less than or equal to the first temperature value, the first return air temperature is: T c1 =T h -1.5; Where, T h is the average ambient temperature; If the average ambient temperature is greater than the first temperature value and less than or equal to the second temperature value, the second return air temperature is: T c2 =T h -2; If the average ambient temperature is greater than the second temperature value, the third return air temperature is: T c3 =T h -2.5。 3. The air-cooled refrigerator control method according to claim 1, characterized in that: The step of acquiring an execution instruction based on the return air pipe temperature difference comprises: If the return air pipe temperature difference is less than the third temperature value, the air-cooled refrigerator is controlled to operate according to the preset instructions so that the freezing chamber reaches the target temperature.

4. The air-cooling refrigerator control method according to claim 3, characterized in that: The step of acquiring an execution instruction based on the return air pipe temperature difference further includes: If the return air pipe temperature difference is greater than or equal to the third temperature value and the duration is greater than the second preset time, determining the most recently acquired first return air pipe temperature difference; If the first return air pipe temperature difference is greater than or equal to the third temperature value and less than the fourth temperature value, the speed of the compressor is controlled to increase according to the first speed, and the refrigeration fan is controlled to decrease according to the second speed, and after running for a third preset time, the second return air pipe temperature difference within the first preset time is obtained; Based on the second return air pipe temperature difference, an execution instruction is obtained.

5. The air-cooling refrigerator control method according to claim 3, characterized in that: The step of acquiring an execution instruction based on the return air pipe temperature difference further includes: If the return air pipe temperature difference is greater than or equal to the third temperature value and the duration is greater than the second preset time, determining the most recently acquired first return air pipe temperature difference; If the first return air pipe temperature difference is greater than or equal to the fourth temperature value and less than the fifth temperature value, the speed of the compressor is controlled to increase according to the third speed, and the refrigeration fan is controlled to decrease according to the fourth speed, and after running for a fourth preset time, the second return air pipe temperature difference within the first preset time is obtained; Based on the second return air pipe temperature difference, an execution instruction is obtained.

6. A method for controlling an air-cooled refrigerator according to claim 4 or 5, characterized in that: The step of acquiring an execution instruction based on the second return air pipe temperature difference comprises: If the temperature difference of the second air return pipe is less than the third temperature value, the air-cooled refrigerator is controlled to operate according to the preset instructions so that the freezing chamber reaches the target temperature.

7. A method for controlling an air-cooled refrigerator according to claim 4 or 5, characterized in that: The step of acquiring an execution instruction based on the second return air pipe temperature difference comprises: If the temperature difference of the second return air pipe is greater than or equal to the third temperature value and less than the fourth temperature value, repeatedly control the speed of the compressor to increase according to the first speed, control the refrigeration fan to decrease according to the second speed, and after running for the third preset time, obtain the temperature difference of the second return air pipe within the first preset time, and based on the second return air pipe temperature difference, obtain the execution instruction step until the temperature difference of the second return air pipe is less than the third temperature value.

8. A method for controlling an air-cooled refrigerator according to claim 4 or 5, characterized in that: The step of acquiring an execution instruction based on the second return air pipe temperature difference comprises: If the temperature difference of the second return air pipe is greater than or equal to the fourth temperature value and less than the fifth temperature value, repeatedly control the speed of the compressor to increase according to the third speed, control the refrigeration fan to decrease according to the fourth speed, and after running for the fourth preset time, obtain the temperature difference of the second return air pipe within the first preset time, and based on the second return air pipe temperature difference, obtain the execution instruction step until the temperature difference of the second return air pipe is less than the third temperature value.

9. A method for controlling an air-cooled refrigerator according to claim 4 or 5, characterized in that: The step of acquiring an execution instruction based on the second return air pipe temperature difference comprises: If the temperature difference of the second return air pipe is greater than or equal to the fifth temperature value, the speed of the compressor is controlled to run according to the set maximum speed, the refrigeration fan is controlled to reduce to the fifth speed, and the refrigeration compensation heater is controlled to turn on until the temperature difference of the second return air pipe is less than the third temperature value.

10. An air-cooled refrigerator control system, characterized in that: include: Set in the box: Control module; And, an ambient temperature acquisition module, a return air pipe temperature acquisition module, a refrigeration compensation heater, a compressor and a refrigeration fan connected to the control module; the ambient temperature acquisition module is used to obtain the ambient temperature, and the return air pipe temperature acquisition module is used to obtain the return air pipe temperature; The control module is configured to: Obtaining the average value of the ambient temperature and the average value of the return air pipe temperature within the first preset time; Based on the average value of the ambient temperature, the return air temperature is obtained according to the return air temperature table; Based on the average return air pipe temperature and the return air temperature, a return air pipe temperature difference is obtained; Based on the return air pipe temperature difference, obtaining an execution instruction; The execution instruction includes: whether the refrigeration compensation heater is turned on, the speed of the compressor and the refrigeration fan; The air-cooled refrigerator is controlled to operate according to the execution instruction so that the freezing chamber reaches the target temperature.

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