A method and system for controlling an air-cooled refrigerator

Abstract

This application provides a control method and system for a frost-free refrigerator. The method includes: acquiring the average ambient temperature and the average return gas pipe temperature within a first preset time period; obtaining the return gas temperature based on the average ambient temperature and a return gas temperature gauge; obtaining the return gas pipe temperature difference based on the average return gas pipe temperature and the return gas temperature; acquiring an execution command based on the return gas pipe temperature difference; the execution command includes: whether the refrigeration compensation heater is turned on, and the rotation speed of the compressor and the refrigeration fan; controlling the frost-free refrigerator to operate according to the execution command, so that the freezer compartment reaches the target temperature, thereby solving the problem that current frost-free refrigerators cannot sense changes in the freezer compartment temperature, and therefore cannot adjust the control logic in time to quickly cool the freezer compartment, which not only affects the cooling effect of the freezer compartment but also leads to an increase in the overall 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 and system for controlling a forced air cooling refrigerator. BACKGROUND

[0002] Among many types of refrigerators, low-cost single-system forced air cooling refrigerators have occupied a certain share in the market due to their economy, simple structure and other characteristics. Such refrigerators usually use a refrigeration sensor to control the operation of the compressor to achieve temperature regulation of the refrigeration chamber. However, in order to reduce costs, the freezer chamber is not provided with a compartment sensor and a door switch, so that the freezer chamber cannot achieve independent temperature control like the refrigeration chamber, but passively follows the refrigeration chamber to refrigerate.

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

[0004] When the refrigeration chamber is put into a heat load, the refrigeration sensor can quickly sense the change in temperature and timely adjust the control logic to start the compressor to refrigerate, thereby maintaining the temperature stability of the refrigeration chamber. However, when the freezer chamber is opened and put into a heat load, since the freezer chamber is not provided with a sensor, the system cannot sense the change in temperature in a short time, so it cannot timely adjust the control logic to quickly achieve the cooling of the freezer chamber, which not only affects the refrigeration effect of the freezer chamber, but also may cause an increase in the overall energy consumption of the refrigerator. SUMMARY

[0005] The present application provides a method and system for controlling a forced air cooling refrigerator to solve the technical problem that the existing forced air cooling refrigerator cannot sense the change in temperature of the freezer chamber, thus cannot timely adjust the control logic to quickly achieve the cooling of the freezer chamber, which not only affects the refrigeration effect of the freezer chamber, but also causes an increase in the overall energy consumption of the refrigerator.

[0006] The first aspect of the present application provides a method for controlling a forced air cooling refrigerator, comprising:

[0007] obtaining an average value of an ambient temperature and an average value of a return air pipe temperature within a first preset time;

[0008] obtaining a return air temperature based on the average value of the ambient temperature according to a return air temperature table;

[0009] obtaining a return air pipe temperature difference based on the average value of the return air pipe temperature and the return air temperature;

[0010] obtaining an execution instruction based on the return air pipe temperature difference; the execution instruction includes whether a refrigeration compensation heater is turned on, and the rotation speed of a compressor and a freezer 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 according to the return air temperature table based on the average ambient temperature comprises:

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

[0014] T c1 = T h -1.5;

[0015] In the formula, 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 a second temperature value, a second return air temperature is:

[0017] T c2 = T h -2;

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

[0019] T c3 = T h -2.5.

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

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

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

[0023] If the return air pipe temperature difference is greater than or equal to the third temperature value and the duration is greater than a second preset time, a first return air pipe temperature difference obtained most recently is determined.

[0024] If the first return air pipe temperature difference is greater than or equal to the third temperature value and less than a fourth temperature value, the rotation speed of the compressor is controlled to increase according to a first rotation speed, the rotation speed of the freezing fan is controlled to decrease according to a second rotation speed, and a second return air pipe temperature difference in a first preset time is obtained after a third preset time of operation.

[0025] The execution instruction is obtained based on the second return air pipe temperature difference.

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

[0027] If the temperature difference of the gas return pipe is greater than or equal to the third temperature value and the duration is greater than the second preset time, the newly obtained first temperature difference of the gas return pipe is determined;

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

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

[0030] In some embodiments, the step of obtaining an execution instruction based on the second temperature difference of the gas return pipe comprises:

[0031] If the second temperature difference of the gas return pipe is less than the third temperature value, the air-cooled refrigerator is controlled to run according to a preset instruction to make the freezing chamber reach a target temperature.

[0032] In some embodiments, the step of obtaining an execution instruction based on the second temperature difference of the gas return pipe comprises:

[0033] If the second temperature difference of the gas return pipe is greater than or equal to the third temperature value and less than the fourth temperature value, the steps of controlling the rotating speed of the compressor to increase according to the first rotating speed, controlling the freezing fan to decrease according to the second rotating speed, running for the third preset time, obtaining the second temperature difference of the gas return pipe within the first preset time, and obtaining an execution instruction based on the second temperature difference of the gas return pipe are repeatedly executed until the second temperature difference of the gas return pipe is less than the third temperature value.

[0034] In some embodiments, the step of obtaining an execution instruction based on the second temperature difference of the gas return pipe comprises:

[0035] If the second temperature difference of the gas return pipe is greater than or equal to the fourth temperature value and less than the fifth temperature value, the steps of controlling the rotating speed of the compressor to increase according to the third rotating speed, controlling the freezing fan to decrease according to the fourth rotating speed, running for the fourth preset time, obtaining the second temperature difference of the gas return pipe within the first preset time, and obtaining an execution instruction based on the second temperature difference of the gas return pipe are repeatedly executed until the second temperature difference of the gas return pipe is less than the third temperature value.

[0036] In some embodiments, the step of obtaining an execution instruction based on the second temperature difference of the gas return pipe comprises:

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

[0038] A second aspect of this application provides a control system for an air-cooled refrigerator, comprising:

[0039] Located inside the box:

[0040] Control module;

[0041] In addition, an ambient temperature acquisition module, a return gas pipe temperature acquisition module, a refrigeration compensation heater, a compressor, and a refrigeration fan are connected to the control module; the ambient temperature acquisition module is used to acquire the ambient temperature, and the return gas pipe temperature acquisition module is used to acquire the return gas pipe temperature;

[0042] The control module is configured as follows:

[0043] Obtain the average ambient temperature and the average return pipe temperature within a first preset time period;

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

[0045] The temperature difference of the return gas pipe is obtained based on the average temperature of the return gas pipe and the return gas temperature.

[0046] Based on the temperature difference in the return gas pipe, an execution command is obtained; the execution command includes: whether the refrigeration compensation heater is turned on, and the rotational speed of the compressor and the refrigeration fan;

[0047] Control the air-cooled refrigerator to operate according to the execution instructions, so that the freezer compartment reaches the target temperature.

[0048] This application provides a control method and system for a frost-free refrigerator. The method includes: acquiring the average ambient temperature and the average return gas pipe temperature within a first preset time period; obtaining the return gas temperature based on the average ambient temperature and a return gas temperature gauge; obtaining the return gas pipe temperature difference based on the average return gas pipe temperature and the return gas temperature; acquiring an execution command based on the return gas pipe temperature difference; the execution command includes: whether the refrigeration compensation heater is turned on, and the rotation speed of the compressor and the refrigeration fan; controlling the frost-free refrigerator to operate according to the execution command, so that the freezer compartment reaches the target temperature, thereby solving the problem that current frost-free refrigerators cannot sense changes in the freezer compartment temperature, and therefore cannot adjust the control logic in time to quickly cool the freezer compartment, which not only affects the cooling effect of the freezer compartment but also leads to an increase in the overall energy consumption of the refrigerator. Attached Figure Description

[0049] 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.

[0050] Figure 1 This is a flowchart of the air-cooled refrigerator control method in this application. Detailed Implementation

[0051] 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.

[0052] Because some technologies fail to detect changes in the freezer compartment temperature, air-cooled refrigerators cannot adjust their control logic in a timely manner to quickly cool the freezer compartment. This not only affects the cooling effect of the freezer compartment but also increases the overall energy consumption of the refrigerator. To solve this technical problem, this application provides a control method and system for an air-cooled refrigerator. The control method and system for an air-cooled refrigerator are described below:

[0053] For example, frost-free refrigerators typically use a cooling sensor to control the compressor's operation to regulate the refrigerator compartment's temperature. However, to reduce costs, the freezer compartment does not have a compartment sensor or door switch. This means the freezer compartment cannot achieve independent temperature control like the refrigerator compartment; instead, it passively cools along with the refrigerator compartment.

[0054] Specifically, in a frost-free refrigerator, the finned evaporator is typically located in the freezer compartment, and a refrigeration fan distributes cold air to each compartment. The refrigerator and freezer compartments are directly connected via an air duct, or a manual damper is installed in the airflow path to adjust the air volume from the freezer to the refrigerator compartment. When a hot load (such as hot food) is placed in the refrigerator compartment, the refrigerator sensor can quickly detect the temperature change and adjust the control logic accordingly, starting the compressor to cool the refrigerator and maintain a stable temperature. However, when a hot load is placed in the freezer compartment, because there is no sensor in the freezer compartment, the system cannot detect the temperature change in a short time, and therefore cannot adjust the control logic in time to quickly cool the freezer compartment. This lag in temperature control not only affects the cooling effect of the freezer compartment but may also lead to an increase in the overall energy consumption of the refrigerator. This is because when the freezer compartment temperature rises, the compressor may need to operate for a longer time and at higher power to maintain a stable temperature in the refrigerator compartment. This not only increases the refrigerator's energy consumption but may also adversely affect its lifespan.

[0055] like Figure 1 The diagram shown is a flowchart of the air-cooled refrigerator control method in this application.

[0056] For example, when a heat load is placed in a compartment of the refrigerator, the air circulation causes an increase in heat exchange at the finned evaporator (an increase in the amount of liquid refrigerant evaporating), which reduces the amount of liquid refrigerant returning to the compressor, resulting in an increase in the temperature of the return pipe.

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

[0058] S100: Obtain the average ambient temperature and the average return pipe temperature within a first preset time period; the average ambient temperature is collected by an ambient temperature sensor, and the average return pipe temperature is obtained by collecting the ambient temperature; the average return pipe temperature is collected by a return pipe temperature sensor, and the average return pipe temperature is obtained by collecting the return pipe temperature. The first preset time period can be selected as 10 minutes.

[0059] It's worth noting that temperature data will only be collected after the refrigerator has accumulated 6 hours of cooling time, not after defrosting, and after the compressor has run for at least 10 minutes at a time. The refrigerator will remain stationary for a period after being powered on to protect the compressor, ensure optimal cooling performance, and extend the refrigerator's lifespan.

[0060] For example, the control module acquires the return pipe temperature and ambient temperature every 10 minutes, and obtains the average return pipe temperature and the average ambient temperature based on the return pipe temperature and ambient temperature.

[0061] S200: Based on the average ambient temperature, the return gas temperature is obtained according to the return gas temperature table; wherein, the return gas temperature table is shown in the table below:

[0062] ambient temperature interval T h ]]> T h ≤20℃ 20°C < T h ≤ 35°C T h > 35°C return gas temperature T c ]]> [CAT h -1.5]]> [CAT h -2]]> [CAT h -2.5]]>

[0063] The step of obtaining the return air temperature based on the average ambient temperature and the return air temperature table includes the following sub-steps:

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

[0065] T c1 =T h -1.5;

[0066] In the formula, T h This represents 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, then 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, then the third return gas temperature is:

[0070] T c3 =T h -2.5.

[0071] S300: Based on the average temperature of the return gas pipe and the return gas temperature, the temperature difference of the return gas pipe is obtained; the temperature difference of the return gas pipe = the average temperature of the return gas pipe - the return gas temperature.

[0072] S400: Based on the temperature difference of the return gas pipe, obtain the execution command; the execution command includes: whether the refrigeration compensation heater is turned on, and the speed of the compressor and the refrigeration fan; the temperature difference of the return gas pipe can determine whether there is a load in the compartment. For example, a load with a high temperature will cause the temperature in the compartment to rise, thereby increasing the compressor speed to quickly lower the temperature in the compartment.

[0073] The step of obtaining the execution command based on the temperature difference of the return gas pipe includes the following sub-steps:

[0074] S410: If the temperature difference ΔT of the return air pipe is less than the third temperature value N1℃, then control the air-cooled refrigerator to operate according to the preset instructions so that the freezer compartment reaches the target temperature.

[0075] The preset command is for the refrigerator to perform refrigeration according to the factory settings. For example, the refrigerator operates the compressor and refrigeration fan speeds according to the temperatures of the refrigerator compartment and the freezer compartment. That is, when the temperature difference ΔT of the return pipe is less than the third temperature value N1℃, the frost-free refrigerator can control the compressor and refrigeration fan to operate according to the factory-set rules and commands so that the freezer compartment reaches the target temperature.

[0076] The step of obtaining the execution command based on the temperature difference of the return gas pipe further includes the following sub-steps:

[0077] S420: If the temperature difference ΔT of the return gas pipe is greater than or equal to the third temperature value N1℃, and the duration is greater than the second preset time, determine the latest obtained first return gas pipe temperature difference; wherein, the second preset time can be selected as 30min.

[0078] In this embodiment, when the temperature difference ΔT of the return gas pipe is greater than or equal to the third temperature value N1℃ and the duration is greater than 30 minutes, it indicates that the freezer compartment is loaded with heat load, and the finally obtained temperature difference ΔT of the return gas pipe is determined as the first temperature difference of the return gas pipe.

[0079] S430: If the temperature difference ΔT1 of the first return gas pipe is greater than or equal to the third temperature value N1℃ and less than the fourth temperature value N2℃, then the speed of the compressor is controlled to increase according to the first speed n1, and the speed of the refrigeration fan is controlled to decrease according to the second speed m1. After running for a third preset time, the temperature difference of the second return gas pipe within the first preset time is obtained; wherein, the third preset time can be selected as 30min.

[0080] In this embodiment, when the temperature difference ΔT1 of the first return pipe is greater than or equal to the third temperature value N1℃ and less than the fourth temperature value N2℃, the control module controls the compressor speed to increase according to the first speed n1 and controls the refrigeration fan to decrease according to the second speed m1. After running for 30 minutes, the refrigerator's refrigeration control logic is readjusted according to the latest obtained temperature difference of the return pipe, i.e., the second temperature difference ΔT2.

[0081] S440: Obtain the execution command based on the temperature difference △T2 of the second return gas pipe.

[0082] The step of obtaining the execution command based on the temperature difference of the return gas pipe further includes the following sub-steps:

[0083] S450: If the temperature difference ΔT of the return gas pipe is greater than or equal to the third temperature value N1℃, and the duration is greater than the second preset time, determine the latest obtained first return gas pipe temperature difference; wherein, the second preset time can be selected as 30min.

[0084] S460: If the temperature difference ΔT1 of the first return gas pipe is greater than or equal to the fourth temperature value N2℃ and less than the fifth temperature value N3℃, then control the speed of the compressor to increase according to the third speed n2, control the speed of the refrigeration fan to decrease according to the fourth speed m2, and after running for a fourth preset time, obtain the temperature difference of the second return gas pipe within the first preset time; the fourth preset time can be selected as 60min.

[0085] In this embodiment, when the temperature difference ΔT1 of the first return pipe is greater than or equal to the fourth temperature value N2℃ and less than the fifth temperature value N3℃, the control module controls the compressor speed to increase according to the third speed n2 and controls the refrigeration fan to decrease according to the fourth speed m2. After running for 60 minutes, the refrigeration control logic of the refrigerator is readjusted according to the latest obtained temperature difference of the return pipe, i.e., the second return pipe temperature difference ΔT2.

[0086] S470: Obtain the execution command based on the temperature difference △T2 of the second return gas pipe.

[0087] The step of obtaining the execution command based on the temperature difference ΔT2 of the second return gas pipe includes the following sub-steps:

[0088] S471: If the temperature difference ΔT2 of the second return gas pipe is less than the third temperature value N1℃, then the frost-free refrigerator is controlled to operate according to a preset instruction to bring the freezer compartment to the target temperature. The preset instruction is that the refrigerator operates according to factory settings, for example: the refrigerator operates the compressor and refrigeration fan speeds according to the temperatures of the refrigerator compartment and freezer compartment. That is, when the temperature difference ΔT2 of the second return gas pipe is less than the third temperature value N1℃, the frost-free refrigerator controls the compressor and refrigeration fan to operate according to the factory-set rules to bring the freezer compartment to the target temperature.

[0089] The step of obtaining the execution command based on the temperature difference ΔT2 of the second return gas pipe further includes the following sub-steps:

[0090] S472: If the second return pipe temperature difference ΔT2 is greater than or equal to the third temperature value N1℃ and less than the fourth temperature value N2℃, then the steps of controlling the compressor speed to increase according to the first speed n1, controlling the refrigeration fan to decrease according to the second speed m1, running for a third preset time, obtaining the second return pipe temperature difference ΔT2 within the first preset time, and obtaining the execution instruction based on the second return pipe temperature difference ΔT2, are repeated until the second return pipe temperature difference is less than the third temperature value.

[0091] In this embodiment, when the second return pipe temperature difference ΔT2 is greater than or equal to the third temperature value N1℃ and less than the fourth temperature value N2℃, the control module controls the compressor speed to increase according to the first speed n1 and controls the refrigeration fan to decrease according to the second speed m1. After running for 30 minutes, the most recently acquired return pipe temperature difference, i.e., the second return pipe temperature difference ΔT2, is determined, and the refrigerator's refrigeration control logic is readjusted. If the second return pipe temperature difference ΔT2 is greater than or equal to the third temperature value N1℃ and less than the fourth temperature value N2℃, the above steps are repeated until the second return pipe temperature difference ΔT2 is less than the third temperature value N1℃. Then, the air-cooled refrigerator is controlled to operate according to a preset command to bring the freezer compartment to the target temperature.

[0092] The step of obtaining the execution command based on the temperature difference ΔT2 of the second return gas pipe further includes the following sub-steps:

[0093] S473: If the second return gas pipe temperature difference ΔT2 is greater than or equal to the fourth temperature value N2℃ and less than the fifth temperature value N3℃, then the steps of controlling the compressor speed to increase according to the third speed n2, controlling the refrigeration fan to decrease according to the fourth speed m2, running for a fourth preset time, obtaining the second return gas pipe temperature difference ΔT2 within the first preset time, and obtaining the execution instruction based on the second return gas pipe temperature difference ΔT2, until the second return gas pipe temperature difference is less than the third temperature value.

[0094] In this embodiment, when the second return pipe temperature difference ΔT2 is greater than or equal to the fourth temperature value N2℃ and less than the fifth temperature value N3℃, the control module controls the compressor speed to increase according to the third speed n2 and controls the refrigeration fan to decrease according to the fourth speed m2. After running for 60 minutes, the most recently acquired return pipe temperature difference, i.e., the second return pipe temperature difference ΔT2, is determined, and the refrigerator's refrigeration control logic is readjusted. If the second return pipe temperature difference ΔT2 is greater than or equal to the fourth temperature value N2℃ and less than the fifth temperature value N3℃, the above steps are repeated. If the second return pipe temperature difference ΔT2 is greater than or equal to the third temperature value N1℃ and less than the fourth temperature value N2℃, the corresponding steps are repeated until the second return pipe temperature difference ΔT2 is less than the third temperature value N1℃. Then, the air-cooled refrigerator is controlled to operate according to a preset command to bring the freezer compartment to the target temperature.

[0095] The step of obtaining the execution command based on the temperature difference of the second return gas pipe includes the following sub-steps:

[0096] S474: If the temperature difference ΔT2 of the second return pipe is greater than or equal to the fifth temperature value N3℃, then the compressor speed is controlled to run at the set maximum speed, the refrigeration fan speed is controlled to decrease to the fifth speed m3, and the refrigeration compensation heater is controlled to turn on, until the temperature difference ΔT2 of the second return pipe is less than the third temperature value N1℃. The set maximum speed of the compressor is the highest speed allowed at the current ambient temperature.

[0097] It is worth noting that compressors generate a significant amount of heat during operation, which needs to be dissipated into the environment through a cooling system. Ambient temperature directly affects the compressor's cooling efficiency. When the ambient temperature rises, the compressor's cooling effect decreases, leading to an increase in the internal temperature of the compressor. Therefore, the compressor's speed must not exceed the maximum permissible speed at the current ambient temperature to prevent damage to the compressor.

[0098] In this embodiment, when the temperature difference ΔT2 of the second return pipe is greater than or equal to the fifth temperature value N3℃, the control module controls the compressor to run at the set maximum speed, controls the refrigeration fan to decrease at the fifth speed m3, and controls the refrigeration compensation heater to turn on, until the temperature difference ΔT2 of the second return pipe is less than the third temperature value N1℃, then controls the air-cooled refrigerator to run according to the preset instructions, so that the freezer compartment reaches 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 is supplied to the freezer compartment, this application provides a refrigerator compensation heater for heating the refrigerator compartment to prevent the temperature of the refrigerator compartment from being too low.

[0100] For example, the speed of the refrigeration fan must not be lower than 70% of its rated speed, for the following reasons:

[0101] Ensuring stable fan operation: When the fan speed is lower than the rated speed, the fan's air volume and pressure output will decrease accordingly, potentially failing to meet actual usage requirements. Furthermore, low speeds can easily lead to fan flutter, increasing noise and affecting the overall operational stability of the fan. Increased flutter and noise not only reduce the fan's lifespan but may also cause disturbance to the surrounding environment.

[0102] Optimizing fan performance: Fans are typically designed with an optimal speed range to ensure their performance is at its best. This optimal speed range usually corresponds to the fan's rated speed. If the speed is below this range, the fan's performance will be severely affected, potentially leading to reduced efficiency and increased energy consumption. Therefore, to maintain optimal fan performance, it is necessary to ensure that the speed does not fall below 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, easily causing backflow or surge. Backflow and surge are serious problems in fan operation, which may lead to fan damage or shutdown. Therefore, to avoid these problems, it is necessary to ensure that the fan speed is not lower than the rated speed.

[0104] Ensuring safety: Operating at low speeds can accelerate wear on internal components of the fan, increasing the risk of malfunction. Furthermore, prolonged operation below the rated speed can lead to overheating, overload, and other safety issues. Therefore, to ensure fan safety, the operating speed must be maintained at or above the rated speed.

[0105] S500: Controls the air-cooled refrigerator to operate according to the executed instructions, bringing the freezer compartment to the target temperature. It intelligently judges the refrigerator's load status by monitoring changes in the return air pipe temperature, and adjusts the control logic accordingly to achieve rapid cooling of the freezer compartment.

[0106] This application provides a control method for a frost-free refrigerator. The control method is simple and is designed for single-system frost-free refrigerators without a freezer sensor and freezer door switch. By detecting the ambient temperature and the return pipe temperature when the compressor is turned on, the heat load of the freezer compartment can be more accurately determined based on the temperature difference of the return pipe. The control logic can be adjusted in a timely manner to quickly reduce the temperature of the freezer compartment.

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

[0108] When the refrigerator's cumulative cooling time reaches 6 hours, and the compressor is started for the first time after defrosting, and after the compressor has run for 10 minutes at a time, the average temperature T of the return pipe is taken every 10 minutes. c Based on the average ambient temperature T during this period h Consulting the return gas temperature table, we can obtain the corresponding return gas temperature T for the refrigerator under light load within this ambient temperature range. c The temperature difference ΔT in the return pipe is calculated to be T. c -T c '.

[0109] Condition 1: If ΔT < 0.5℃, control the air-cooled refrigerator to operate according to the preset instructions to make the freezer compartment reach the target temperature;

[0110] Condition 2: If ΔT ≥ 0.5℃ lasts for more than 30 minutes, it is determined that the freezer compartment has been loaded with heat, and the control logic is adjusted according to the last ΔT value.

[0111] 1) If 0.5℃≤△T<1℃, increase the compressor speed of the air-cooled refrigerator by 300r and decrease the refrigeration fan speed by 100r; after running for 30 minutes, readjust the refrigerator's control logic according to the latest △T1.

[0112] a) If △T1<0.5℃, control the air-cooled refrigerator to operate according to the preset instructions to make the freezer compartment reach the target temperature;

[0113] b) If 0.5℃≤△T1<1℃, execute the steps corresponding to condition one;

[0114] c) If 1℃≤△T1<1.5℃, execute the steps corresponding to condition two;

[0115] d) If △T1≥1.5℃, execute the steps corresponding to condition three;

[0116] 2) If 1℃≤△T1<1.5℃, increase the compressor speed of the air-cooled refrigerator by 500r and decrease the refrigeration fan speed by 200r; after running for 60 minutes, readjust the refrigerator's control logic according to the latest △T2.

[0117] a) If △T2<0.5℃, control the air-cooled refrigerator to operate according to the preset instructions to make the freezer compartment reach the target temperature;

[0118] b) If 0.5℃≤△T2<1℃, execute the steps corresponding to condition one;

[0119] c) If 1℃≤△T2<1.5℃, execute the steps corresponding to condition two;

[0120] d) If △T2≥1.5℃, execute the steps corresponding to condition three;

[0121] Condition 3: If △T≥1.5℃, control the compressor speed of the air-cooled refrigerator to increase to the maximum speed allowed by the current ambient temperature, reduce the speed of the refrigeration fan by 300r, and start the refrigeration compensation heater until △T<0.5℃, then control the air-cooled refrigerator to operate according to the preset instructions.

[0122] A second aspect of this application provides a control system for an air-cooled refrigerator, comprising:

[0123] Located inside the box:

[0124] Control module;

[0125] In addition, an ambient temperature acquisition module, a return gas pipe temperature acquisition module, a refrigeration compensation heater, a compressor, and a refrigeration fan are connected to the control module; the ambient temperature acquisition module is used to acquire the ambient temperature, and the return gas pipe temperature acquisition module is used to acquire the return gas pipe temperature;

[0126] The control module is configured as follows:

[0127] Obtain the average ambient temperature and the average return pipe temperature within a first preset time period;

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

[0129] The temperature difference of the return gas pipe is obtained based on the average temperature of the return gas pipe and the return gas temperature.

[0130] Based on the temperature difference in the return gas pipe, an execution command is obtained; the execution command includes: whether the refrigeration compensation heater is turned on, and the rotational speed of the compressor and the refrigeration fan;

[0131] Control the air-cooled refrigerator to operate according to the execution instructions, so that the freezer compartment reaches the target temperature.

[0132] It is worth noting that the effects of the above system embodiments can be found in the effects of the above method embodiments, and will not be repeated here.

[0133] 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 of controlling a forced air refrigerator, characterized by, The method comprises the following steps: obtaining an average ambient temperature and an average return air pipe temperature within a first preset time; based on the average ambient temperature, obtaining a return air temperature according to a return air temperature table; based on the average return air pipe temperature and the return air temperature, obtaining a return air pipe temperature difference; based on the return air pipe temperature difference, obtaining an execution instruction; the execution instruction comprises whether a refrigeration compensation heater is turned on, a rotation speed of a compressor and a rotation speed of a freezing fan; controlling the air-cooled refrigerator to operate according to the execution instruction to make the freezing chamber reach a target temperature; the step of obtaining the return air temperature based on the average ambient temperature according to the return air temperature table comprises the following steps: if the average ambient temperature is less than or equal to a first temperature value, a first return air temperature is: T c1 =T h -1.5; In the formula, T h is the average value of the ambient temperature; if the average ambient temperature is greater than the first temperature value and less than or equal to a second temperature value, a second return air temperature is: T c2 =T h -2; if the average ambient temperature is greater than the second temperature value, a third return air temperature is: T c3 =T h -2.

5.

2. The method of controlling a forced air refrigerator according to claim 1, wherein, the step of obtaining the execution instruction based on the return air pipe temperature difference comprises the following steps: if the return air pipe temperature difference is less than a third temperature value, controlling the air-cooled refrigerator to operate according to a preset instruction to make the freezing chamber reach the target temperature.

3. The method of controlling a forced air refrigerator according to claim 2, wherein, the step of obtaining the execution instruction based on the return air pipe temperature difference further comprises the following steps: if the return air pipe temperature difference is greater than or equal to the third temperature value and a duration is greater than a second preset time, determining a newly obtained 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 a fourth temperature value, controlling the rotation speed of the compressor to increase according to a first rotation speed, controlling the rotation speed of the freezing fan to decrease according to a second rotation speed, operating for a third preset time, and then obtaining a second return air pipe temperature difference within the first preset time; based on the second return air pipe temperature difference, obtaining the execution instruction.

4. The method of claim 2, wherein the method further comprises: the step of obtaining the execution instruction based on the return air pipe temperature difference further comprises the following steps: 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 newly obtained first return air pipe temperature difference; if the first return air pipe temperature difference is greater than or equal to a fourth temperature value and less than a fifth temperature value, controlling the rotation speed of the compressor to increase according to a third rotation speed, controlling the rotation speed of the freezing fan to decrease according to a fourth rotation speed, operating for a fourth preset time, and then obtaining the second return air pipe temperature difference within the first preset time; based on the second return air pipe temperature difference, obtaining the execution instruction.

5. The method of controlling a forced air refrigerator according to claim 3 or 4, wherein, the step of obtaining the execution instruction based on the second return air pipe temperature difference comprises the following steps: if the second return air pipe temperature difference is less than the third temperature value, controlling the air-cooled refrigerator to operate according to the preset instruction to make the freezing chamber reach the target temperature.

6. The method of controlling a forced air refrigerator according to claim 3 or 4, wherein, the step of obtaining the execution instruction based on the second return air pipe temperature difference comprises the following steps: if the second return air pipe temperature difference is greater than or equal to the third temperature value and less than a fourth temperature value, repeatedly performing the steps of controlling the rotation speed of the compressor to increase according to the first rotation speed, controlling the rotation speed of the freezing fan to decrease according to the second rotation speed, operating for the third preset time, obtaining the second return air pipe temperature difference within the first preset time, and obtaining the execution instruction based on the second return air pipe temperature difference until the second return air pipe temperature difference is less than the third temperature value.

7. The method of controlling a forced air refrigerator according to claim 3 or 4, wherein, The step of obtaining an execution instruction based on the second return air pipe temperature difference comprises: If the second return air pipe temperature difference is greater than or equal to the fourth temperature value and less than a fifth temperature value, the step of obtaining an execution instruction based on the second return air pipe temperature difference is repeated until the second return air pipe temperature difference is less than the third temperature value.

8. The method of controlling a forced air refrigerator according to claim 3 or 4, wherein, The step of obtaining an execution instruction based on the second return air pipe temperature difference comprises: If the second return air pipe temperature difference is greater than or equal to the fifth temperature value, the step of obtaining an execution instruction based on the second return air pipe temperature difference is repeated until the second return air pipe temperature difference is less than the third temperature value.

9. An air-cooled refrigerator control system, characterized by, Comprise: The control module is arranged in the cabinet. The control module is connected with the ambient temperature acquisition module, the return air pipe temperature acquisition module, the refrigeration compensation heater, the compressor and the freezer fan. The control module is configured to: Obtain an average ambient temperature and an average return air pipe temperature within a first preset time; Obtain a return air temperature based on the average ambient temperature and a return air temperature table; Obtain a return air pipe temperature difference based on the average return air pipe temperature and the return air temperature; Obtain an execution instruction based on the return air pipe temperature difference; The execution instruction comprises whether the refrigeration compensation heater is turned on, and the rotation speed of the compressor and the freezer fan; The air-cooled refrigerator is controlled to operate according to the execution instruction, so that the freezing chamber reaches a target temperature. The step of obtaining a return air temperature based on the average ambient temperature and a return air temperature table comprises: If the average ambient temperature is less than or equal to a first temperature value, a first return air temperature is: Tc1=Th-1.5; In the formula, Th is the average ambient temperature. If the average ambient temperature is greater than the first temperature value and less than or equal to a second temperature value, a second return air temperature is: Tc2=Th-2; If the average ambient temperature is greater than the second temperature value, a third return air temperature is: Tc3=Th-2.

5. ​

Images