Refrigerator and control method for refrigerator

Abstract

Some embodiments of the present application relate to the technical field of household appliances, and provide a refrigerator and a control method for the refrigerator. In the refrigerator and the control method, when the refrigerator enters a defrosting mode, a first temperature value at the current moment is acquired by means of a first temperature sensor. A second temperature value measured by the first temperature sensor at a first moment is acquired. A first temperature change rate is determined on the basis of the first temperature value and the second temperature value, and whether defrosting is completed is determined on the basis of the first temperature change rate. If yes, the refrigerator is controlled to enter a refrigeration mode.

Description

Refrigerator and control method of refrigerator

[0001] Cross-reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No. 2024110442026, filed on July 31, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] Some embodiments of the present application relate to the technical field of household appliances. More specifically, it relates to a refrigerator and a control method of the refrigerator. BACKGROUND

[0004] When the surface temperature of the finned evaporator is lower than the air dew point temperature and lower than 0°C, frost will form on the surface of the evaporator when the air-cooled refrigerator is in the refrigeration mode. As the frost layer becomes thicker, defrosting needs to be performed to avoid frost blockage of the finned evaporator, which will cause the heat exchange efficiency to decrease and the temperature in the compartment to rise.

[0005] In the related art, defrosting can be performed by means of reverse flow of refrigerant when the defrosting mode is started. The high-temperature, high-pressure gas flowing out of the compressor enters the evaporator, and the heat from the high-temperature, high-pressure gas is used to defrost the evaporator. SUMMARY

[0006] Some embodiments of the present application provide a refrigerator, comprising:

[0007] a cabinet;

[0008] an evaporator located in the cabinet;

[0009] a first temperature sensor arranged on an air inlet pipeline of an air inlet of the evaporator and configured to detect a temperature value of the air inlet of the evaporator;

[0010] a controller electrically connected to the first temperature sensor and configured to:

[0011] after the refrigerator enters the defrosting mode, obtain a first temperature value at a current time, the first temperature value being a temperature value read by the first temperature sensor at the current time;

[0012] obtain a second temperature value at a first time, the second temperature value being a temperature value read by the first temperature sensor at the first time, the first time being a time obtained by moving forward a preset time length relative to the current time;

[0013] determine a first temperature change rate according to the first temperature value and the second temperature value through a change rate algorithm;

[0014] determining whether defrosting is completed according to the first temperature change rate compared with a preset value;

[0015] controlling the refrigeration system to exit the defrosting mode when the first temperature change rate is greater than the preset value; wherein the defrosting mode is a working state of the refrigerator started for removing frost of the evaporator in a refrigeration process.

[0016] In some embodiments of the present application, the refrigerator further comprises:

[0017] a compressor located in the cabinet;

[0018] a condenser located in the cabinet;

[0019] a solenoid valve arranged between the compressor and the condenser and the evaporator, the solenoid valve selectively enabling the compressor to communicate with the condenser or the evaporator.

[0020] In some embodiments of the present application, when the refrigerator is in a refrigeration mode, the solenoid valve enables the compressor to communicate with the condenser, and the refrigerant flowing out of the compressor passes through the condenser; when the refrigerator is in the defrosting mode, the solenoid valve enables the compressor to communicate with the evaporator, and the refrigerant flowing out of the compressor passes through the evaporator.

[0021] In some embodiments of the present application, the preset time length is 1 / n of a defrosting experience time length, wherein n is an integer greater than or equal to 2.

[0022] In some embodiments of the present application, when the preset time length is less than a time length corresponding to a rapid temperature change period;

[0023] the controller is configured to:

[0024] obtain at least one second temperature change rate, the at least one second temperature change rate being a change rate of temperature values corresponding to each two adjacent time points in a plurality of time points before the first time point; the time length between any two adjacent time points in the plurality of time points being the preset time length;

[0025] determine whether the at least one second temperature change rate and the first temperature change rate are above a preset value;

[0026] if the at least one second temperature change rate and the first temperature change rate are above the preset value, it is determined that defrosting is completed;

[0027] If there is a change rate less than the preset value in the at least one second temperature change rate and the first temperature change rate, it is determined that defrosting is not completed.

[0028] In some embodiments of the present application, the controller is further configured to:

[0029] If there is a change rate less than the preset value in the at least one second temperature change rate and the first temperature change rate, a current defrosting duration is obtained, the current defrosting duration being a duration between the current time and a time when the refrigeration system enters the defrosting mode;

[0030] It is determined whether the current defrosting duration reaches a preset defrosting duration;

[0031] If the current defrosting duration reaches the preset defrosting duration, it is determined whether the first temperature value is greater than or equal to a preset temperature value;

[0032] If the first temperature value is greater than or equal to the preset temperature value, it is determined that defrosting is completed;

[0033] If the first temperature value is less than the preset temperature value, it is determined that defrosting is not completed.

[0034] In some embodiments of the present application, the refrigerator further comprises:

[0035] A flow regulating valve is arranged between the condenser and the evaporator;

[0036] A first pressure sensor is arranged on an exhaust pipeline connected with the electromagnetic valve of the compressor;

[0037] A second pressure sensor is arranged on a return pipeline connected with the electromagnetic valve of the compressor;

[0038] The first pressure sensor and the second pressure sensor are respectively electrically connected with the controller;

[0039] The controller is further configured to:

[0040] When it is detected that the evaporator has a defrosting demand, a first pressure value is obtained through the first pressure sensor, and a second pressure value is obtained through the second pressure sensor;

[0041] It is determined whether a difference between the first pressure value and the second pressure value is less than a preset difference value;

[0042] If the difference is less than the preset difference value, a flow of the flow regulating valve is controlled to be a first flow;

[0043] The electromagnetic valve is controlled to make the compressor communicate with the evaporator, and the compressor is controlled to be turned on.

[0044] In some embodiments of the present application, the controller is further configured to:

[0045] When it is detected that the evaporator has a defrosting requirement, the state of the compressor is obtained, and the state is start-up or shutdown;

[0046] If the state of the compressor is start-up, when the refrigeration system exits the refrigeration mode, the state of the compressor is controlled to be shutdown, and the flow of the flow regulating valve is controlled to be a second flow, the second flow being greater than the first flow.

[0047] In some embodiments of the present application, the refrigerator further comprises:

[0048] A second temperature sensor is arranged on a return gas pipeline connected with the compressor and adjacent to the second pressure sensor, the second temperature sensor is configured to detect a temperature value of a return gas port of the compressor, and is electrically connected with the controller;

[0049] The controller is further configured to:

[0050] After the start-up of the compressor is controlled, a third temperature value of the second temperature sensor and a third pressure value of the second pressure sensor are obtained;

[0051] A critical temperature of a saturated gaseous refrigerant corresponding to the third pressure value is determined;

[0052] If the third temperature value is less than or equal to the critical temperature, the flow of the flow regulating valve is controlled to be a third flow.

[0053] In some embodiments of the present application, the controller is configured to:

[0054] An ambient temperature of an environment in which the refrigerator is located is obtained;

[0055] A target adjustment range is determined in a preset corresponding relationship according to the ambient temperature, the preset corresponding relationship including a plurality of ambient temperatures and a flow adjustment range corresponding to each ambient temperature;

[0056] The third flow is determined by a flow algorithm according to the initial flow and the target adjustment range.

[0057] In some embodiments of the present application, a second branch and a first branch are arranged in parallel between the condenser and the evaporator; a first drying filter is arranged on the second branch, a switch valve, a throttling device and a second drying filter are arranged on the first branch; wherein the flow regulating valve is arranged on the second branch and between the condenser and the first drying filter;

[0058] When the refrigeration system is in the defrosting mode, the switch valve is in the closed state, and the electromagnetic valve causes the compressor to communicate with the evaporator, and the refrigerant flowing out of the compressor passes through the air outlet of the evaporator, the air inlet of the evaporator, the second branch, and flows to the condenser.

[0059] When the refrigeration system is in the defrosting mode, the switch valve is in the closed state, and the electromagnetic valve causes the compressor to communicate with the evaporator, and the refrigerant flowing out of the compressor passes through the air outlet of the evaporator, the air inlet of the evaporator, the second branch, and flows to the condenser.

[0060] In some embodiments of the present application, the compressor, the condenser, the evaporator and the electromagnetic valve constitute a refrigeration system.

[0061] Some embodiments of the present application provide a control method of a refrigerator, the refrigerator comprising:

[0062] a cabinet;

[0063] an evaporator, disposed in the cabinet;

[0064] a first temperature sensor, disposed on an air inlet pipeline of an air inlet of the evaporator, and configured to detect a temperature value of the air inlet of the evaporator;

[0065] The method comprises:

[0066] After the refrigerator enters the defrosting mode, a first temperature value at a current time is obtained, the first temperature value being a temperature value read by the first temperature sensor at the current time;

[0067] a second temperature value at a first time is obtained, the second temperature value being a temperature value read by the first temperature sensor at the first time; the first time being a time obtained by moving forward a preset time length relative to the current time;

[0068] According to the first temperature value and the second temperature value, a first temperature change rate is determined by a change rate algorithm;

[0069] According to the first temperature change rate, a comparison with a preset value is made to determine whether the defrosting is completed;

[0070] When the first temperature change rate is greater than the preset value, the refrigeration system is controlled to enter the refrigeration mode.

[0071] In some embodiments of the present application, the refrigerator further comprises:

[0072] a compressor, located in the cabinet;

[0073] a condenser located in the cabinet;

[0074] a solenoid valve arranged between the compressor and the condenser and the evaporator, the solenoid valve selectively enabling the compressor to communicate with the condenser or the evaporator.

[0075] In some embodiments of the present application, when the refrigeration system is in the refrigeration mode, the solenoid valve enables the compressor to communicate with the condenser, and the refrigerant flowing out of the compressor passes through the condenser; when the refrigeration system is in the defrosting mode, the solenoid valve enables the compressor to communicate with the evaporator, and the refrigerant flowing out of the compressor passes through the evaporator. BRIEF DESCRIPTION OF DRAWINGS

[0076] In order to more clearly illustrate the embodiments of the present application or the implementation manners in the related art, the drawings needed to be used in the description of some embodiments or the related art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0077] FIG. 1 is a schematic view of a refrigerator according to some embodiments of the present application;

[0078] FIG. 2 is a schematic view of a refrigeration system according to some embodiments of the present application;

[0079] FIG. 3 is a schematic view of a refrigeration system according to some embodiments of the present application;

[0080] FIG. 4 is a schematic view of the flow direction of refrigerant when the refrigeration system is in a refrigeration mode according to some embodiments of the present application;

[0081] FIG. 5 is a schematic view of the flow direction of refrigerant when the refrigeration system is in a defrosting mode according to some embodiments of the present application;

[0082] FIG. 6 is a flowchart of a control method of a refrigerator according to some embodiments of the present application;

[0083] FIG. 7 is a schematic view of the time length corresponding to a rapid temperature change period according to some embodiments of the present application;

[0084] FIG. 8 is a flowchart of a control method of a refrigerator according to some embodiments of the present application;

[0085] FIG. 9 is a schematic view of a plurality of time points before a first time point according to some embodiments of the present application;

[0086] FIG. 10 is a flowchart of a control method of a refrigerator according to some embodiments of the present application;

[0087] Fig. 11 is a flow diagram of a control method of a refrigerator according to some embodiments of the present application;

[0088] Fig. 12 is a diagram of an installation of a pressure sensor according to some embodiments of the present application.

[0089] Legend: 10 - refrigerator; 11 - freezing chamber; 101 - cabinet; 102 - door; 103 - refrigeration system; 104 - controller; 31 - compressor; 32 - condenser; 33 - evaporator; 34 - electromagnetic valve; 35 - first dry filter; 36 - flow regulating valve; 37 - on-off valve; 38 - throttling device; 39 - second dry filter; 40 - first temperature sensor; 41 - first pressure sensor; 42 - second pressure sensor; 43 - second temperature sensor; 411 - pressure sensitive component; 412 - electrical signal processing component; b1 - first connection port; b2 - second connection port; b3 - third connection port; b4 - fourth connection port. DETAILED DESCRIPTION

[0090] In order to make the embodiments and advantages of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to clearly and completely describe some exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application.

[0091] It should be noted that the brief description of the terms in the present application is only for the convenience of understanding the following described embodiments, and is not intended to limit the embodiments of the present application. Unless otherwise specified, these terms should be understood according to their ordinary and general meanings.

[0092] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclusive inclusion, for example, a product or device including a series of components does not have to be limited to those components clearly listed, but can include other components not clearly listed or inherent to these products or devices.

[0093] In the refrigeration process of the air-cooled refrigerator, when the surface temperature of the finned evaporator is lower than the dew point temperature of the air and lower than 0℃, frost will form on the surface of the evaporator. With the passage of time, the frost layer will become thicker and thicker, and defrosting needs to be performed to avoid frost blocking the finned evaporator, which leads to a decrease in heat exchange efficiency, a small air duct cross section, and poor air circulation, resulting in an increase in the temperature of the compartment.

[0094] In defrosting by means of reverse flow of refrigerant (i.e., the high-temperature and high-pressure gas flowing out of the compressor enters the evaporator, and the heat of the high-temperature and high-pressure gas is used to defrost the evaporator), in some embodiments, whether the evaporator has completed defrosting can be determined by detecting the temperature of the surface layer of the evaporator. However, it takes time for heat to conduct from the surface of the evaporator to the inside of the frost layer. The change in the temperature of the surface layer can be faster than the change in the temperature of the inside, so when the temperature of the surface layer reaches the expected value, the inside frost layer can not have completely melted, thus making the defrosting control inaccurate.

[0095] In addition, the proportion of the heat exchange amount of the high-pressure end heat exchanger and the heat exchange amount of the low-pressure end heat exchanger of the refrigerator is determined according to the requirements of refrigeration in the forward flow of refrigerant. When the refrigerant flows in the reverse direction, the original high-pressure end heat exchanger becomes a low-pressure end heat exchanger, and the original low-pressure end heat exchanger becomes a high-pressure end heat exchanger. That is, the proportion of the heat exchange amount changes, resulting in a mismatch between the heat exchange amount in the defrosting mode, which leads to a decrease in the heat exchange efficiency of the refrigeration system. Then, the refrigerant cannot be completely evaporated in the heat exchanger, resulting in liquid in the return gas of the compressor, thus causing the liquid strike phenomenon of the compressor and damage to the compressor. The low-pressure end heat exchanger can be an evaporator, and the high-pressure end heat exchanger can be a condenser.

[0096] Some embodiments of the present application provide a refrigerator. In the process of controlling the reverse flow of refrigerant to defrost the evaporator, whether the defrosting is completed can be determined according to the rate of change of the temperature value of the exhaust port of the evaporator when the refrigerant flows in the reverse direction. Since the reverse flow defrosting is a heat conduction mode, heat is transferred from the inside of the pipeline to the outside of the pipeline to gradually melt the frost on the surface layer of the evaporator. When the refrigerant flows out of the exhaust port of the evaporator, the rate of change of the temperature value of the exhaust port can reflect the heat exchange situation inside the evaporator, i.e., the melting degree of the frost layer of the entire evaporator, rather than only the melting degree of the surface layer. Therefore, whether the defrosting is completed can be determined according to the rate of change of the temperature value of the exhaust port of the evaporator, and the defrosting is ended in time when it is determined that the defrosting is completed, thus realizing the control of defrosting and improving the reliability of defrosting. It can be understood that the exhaust port is the inlet of the evaporator when the refrigerant flows in the forward direction during refrigeration, i.e., the exhaust port is the air inlet of the evaporator when the refrigerant flows in the forward direction.

[0097] The technical solutions of the present application will be described in detail below in combination with some embodiments. Some embodiments below can be combined with each other or can exist independently, and some embodiments below will not be described again for the same or similar concepts or processes. Some embodiments of the present application will be described below in combination with the drawings.

[0098] Firstly, the specific structure of a refrigerator provided by some embodiments of the present application will be described. In some embodiments, FIG. 1 is a schematic diagram of a refrigerator provided by some embodiments of the present application, as shown in FIG. 1, the refrigerator 10 includes a cabinet 101, a door body 102, and a storage compartment arranged in the cabinet 101. In some embodiments, as shown in FIG. 1, the storage compartment includes a refrigeration compartment and a freezing compartment 11, etc., and the refrigeration compartment is not shown in FIG. 1.

[0099] It can be understood that FIG. 1 is only a schematic diagram of a refrigerator applicable to some embodiments of the present application, and the refrigerator can also be a refrigerator of other structures, which is not limited by the present application. In some embodiments, the refrigerator of some embodiments of the present application can be a single-system refrigerator (a plurality of compartments share one evaporator), a double-system refrigerator (the freezing compartment and the refrigeration compartment use different evaporators), or a triple-system refrigerator (the freezing compartment, the refrigeration compartment, and the variable-temperature compartment use different evaporators). In some embodiments, FIG. 1 is a double-system refrigerator in some embodiments.

[0100] In some embodiments, as shown in FIG. 2, the refrigerator 10 further includes a refrigeration system 103 and a controller 104. The refrigeration system 103 and the controller 104 can be electrically connected. In some embodiments, FIG. 2 is a structural schematic diagram of a refrigeration system 103 provided by some embodiments of the present application, as shown in FIG. 2, the refrigeration system 103 includes:

[0101] a compressor 31 configured to provide power for refrigeration of the refrigerator 10;

[0102] a condenser 32 configured to dissipate heat of the refrigerant from the compressor 31;

[0103] an evaporator 33 configured to provide cold energy for the storage compartment.

[0104] In some embodiments, if the refrigerator 10 is a double-system refrigerator or a triple-system refrigerator, the evaporator 33 can be an evaporator for refrigerating the freezing compartment 11, and the refrigeration system 103 further includes an evaporator for refrigerating other compartments. The connection between the evaporator and the condenser 32 can be the same as the connection between the evaporator 33 and the condenser 32, which will not be described again here.

[0105] In some embodiments, the compressor 31 is in communication with the condenser 32 and the evaporator 33, respectively. The refrigeration system 103 further comprises a solenoid valve 34 arranged between the compressor 31 and the condenser 32 and the evaporator 33. The solenoid valve 34 can selectively enable the compressor 31 to communicate with the condenser 32 or the evaporator 33, that is, the solenoid valve 34 can control the flow direction of the refrigerant flowing out of the compressor 31, for example, in the refrigeration mode, the flow direction of the refrigerant flowing out of the compressor 31 is controlled to be toward the condenser 32, and in the defrosting mode, the flow direction of the refrigerant flowing out of the compressor 31 is controlled to be toward the evaporator 33.

[0106] In some embodiments, FIG. 3 is a structural schematic diagram of a refrigeration system 103 provided by some embodiments of the present application, as shown in FIG. 3, a second branch and a first branch are arranged in parallel between the condenser 32 and the evaporator 33, that is, a defrosting branch and a refrigeration branch are arranged between the condenser 32 and the evaporator 33, the first dry filter 35 and the flow regulating valve 36 are arranged on the second branch, and the on-off valve 37, the throttling device 38 and the second dry filter 39 are arranged on the first branch. Specifically, when the refrigeration system 103 is in the refrigeration mode, the on-off valve 37 is in the open state, the solenoid valve 34 enables the compressor 31 to communicate with the condenser 32, and the refrigerant flowing out of the compressor 31 passes through the condenser 32, the first branch, the second branch, and flows to the evaporator 33 through the gas inlet of the evaporator 33. When the refrigeration system 103 is in the defrosting mode, the on-off valve 37 is in the closed state, the solenoid valve 34 enables the compressor 31 to communicate with the evaporator 33, and the refrigerant flowing out of the compressor 31 passes through the gas outlet of the evaporator 33, the evaporator 33, the gas inlet of the evaporator 33, the second branch, and flows to the condenser 32. In some embodiments, the solenoid valve 34 and the on-off valve 37 are respectively electrically connected with the controller 104, and the controller 104 can control the solenoid valve 34 and the on-off valve 37 according to the mode of the refrigerant.

[0107] In some embodiments, referring to FIG. 4 or FIG. 5, the solenoid valve 34 comprises a first connecting port b1, a second connecting port b2, a third connecting port b3 and a fourth connecting port b4. The first connecting port b1 is in communication with the gas outlet of the compressor 31, the second connecting port b2 is in communication with the condenser 32, the third connecting port b3 is in communication with the gas return port of the compressor 31, and the fourth connecting port b4 is in communication with the evaporator 33.

[0108] In some embodiments, the controller 104 is configured to:

[0109] As shown in FIG. 4, when the refrigeration system 103 is in the refrigeration mode, the control switch valve 37 is opened, and the first connection port b1 of the electromagnetic valve 34 is communicated with the second connection port b2, and the third connection port b3 is communicated with the fourth connection port b4, so that the refrigerant flowing out of the exhaust port of the compressor 31 flows to the condenser 32, then flows to the evaporator 33 through the condenser 32, and finally flows to the compressor 31 to complete the refrigeration cycle of the refrigerator.

[0110] As shown in FIG. 5, when the refrigeration system 103 is in the defrosting mode, the control switch valve 37 is closed, and the first connection port b1 of the electromagnetic valve 34 is communicated with the fourth connection port b4, and the second connection port b2 is communicated with the third connection port b3, so that the refrigerant flowing out of the exhaust port of the compressor 31 flows to the evaporator 33, then flows to the condenser 32 from the evaporator 33, and finally flows to the compressor 31.

[0111] In some embodiments, a defrosting temperature sensor and a dew point (humidity) sensor are arranged on the surface of the evaporator 33 or in the evaporating chamber to monitor the surface frosting condition and the indoor humidity change in real time. The controller 104 dynamically calculates the defrosting opportunity according to the refrigerator use frequency (door opening times), the indoor temperature and humidity change curve, and the evaporator surface temperature drop condition, instead of fixed clock defrosting. In combination with the operating power of the compressor 31 and the environmental temperature, the defrosting period and time length with smaller power consumption are automatically selected under the premise of ensuring the defrosting effect. In some embodiments, when the refrigeration load changes, the controller 104 adjusts the rotating speed of the variable frequency compressor 31 through PWM or communication bus control instruction to smooth the temperature fluctuation, reduce the start-up impact and save energy. According to the operating state of the compressor and the temperature difference between the condenser 32 and the evaporator 33, the rotating speed of the condensing fan and the evaporating fan is controlled to achieve better heat exchange efficiency. The controller 104 is internally provided with a ring-shaped log buffer area to record the compressor current, voltage, temperature difference between inlet and outlet, and environmental parameters for trend analysis. According to the real-time and historical data, abnormal high / low temperature, fan non-rotation, electromagnetic valve jamming, refrigerant leakage (through the temperature difference drop rate) and other conditions are distinguished, and the fault code is pushed through the display screen or the mobile phone App.

[0112] In some embodiments, the first drying filter 35 and the second drying filter 39 can remove water and impurities to protect the components of the refrigeration system and improve the purity of the refrigerant. The throttling device 38 is used to control the refrigerant flow, reduce the pressure and temperature, and improve the refrigeration efficiency. In some embodiments, the throttling device 38 can be a capillary tube or a throttling valve, and the present application does not make any limitation.

[0113] In some embodiments, Fig. 4 is a schematic diagram of the flow direction of the refrigerant in the refrigeration system 103 in the refrigeration mode according to some embodiments of the present application. As shown in Fig. 4, the low-temperature and low-pressure refrigerant is sucked into the compressor 31, compressed into high-temperature and high-pressure refrigerant in the cylinder of the compressor 31, and then enters the condenser 32 through the solenoid valve 34. The high-temperature and high-pressure refrigerant gas is cooled by the condenser 32, and the temperature gradually decreases to become a liquid. Then, the liquid enters the first branch, is dried and filtered by the second drying filter 39, and then is throttled and decompressed into a normal-temperature and low-pressure wet vapor by the throttling device 38. Subsequently, the wet vapor absorbs heat to vaporize in the evaporator 33, not only reduces the temperature of the evaporator 33 and its surroundings, but also changes the refrigerant into a low-temperature and low-pressure gas, so as to pass through the compressor 31 again to complete the refrigeration cycle of the refrigerator. In some embodiments, when the refrigeration system 103 is in the refrigeration mode, the refrigerant can flow to the evaporator through the second branch.

[0114] In some embodiments, Fig. 5 is a schematic diagram of the flow direction of the refrigerant in the refrigeration system 103 in the defrosting mode according to some embodiments of the present application. As shown in Fig. 5, the low-temperature and low-pressure refrigerant is sucked into the compressor 31, compressed into high-temperature and high-pressure refrigerant in the cylinder of the compressor 31, and then flows to the evaporator 33 to defrost the evaporator 33, and then enters the second branch, enters the condenser 32 to evaporate along the first drying filter 35 and the flow regulating valve 36, and returns to the compressor 31. The high-temperature and high-pressure refrigerant can melt the ice and frost condensed on the evaporator 33 by heat conduction in the evaporator 33 to achieve defrosting. The arrows in Figs. 4 and 5 represent the flow direction of the refrigerant.

[0115] In some embodiments, as shown in Fig. 5, the refrigerator 10 further comprises a first temperature sensor 40 arranged on the air inlet pipeline of the air inlet of the evaporator 33. In some embodiments, the first temperature sensor 40 can be arranged close to the air inlet of the evaporator 33, and is configured to detect the temperature value of the air inlet of the evaporator 33.

[0116] In some embodiments, as shown in Fig. 3, a first pressure sensor 41 is arranged on the exhaust pipeline connected between the compressor 31 and the solenoid valve 34. A second pressure sensor 42 is arranged adjacent to the second pressure sensor 42 on the return pipeline connected between the compressor 31 and the solenoid valve 34. In some embodiments, as shown in Fig. 3, a second temperature sensor 43 is arranged adjacent to the second pressure sensor 42 on the return pipeline connected between the compressor 31 and the solenoid valve 34, and is configured to detect the temperature value of the return air inlet of the compressor 31. In some embodiments, the first pressure sensor 41 and the second pressure sensor 42 are respectively electrically connected to the controller 104, and the second temperature sensor 43 is electrically connected to the controller 104. In some embodiments, the controller 104 can be a microcontroller unit (MCU).

[0117] Hereinafter, the control method of the refrigerator provided by some embodiments of the present application will be described based on the above-described refrigerator.

[0118] FIG. 6 is a flowchart of a control method of a refrigerator according to some embodiments of the present application. The method can be executed by the controller of the above-described refrigerator. As shown in FIG. 6, the method can include the following steps.

[0119] S601, after the refrigeration system enters the defrosting mode, obtaining a first temperature value at the current time through the first temperature sensor.

[0120] After the refrigeration system enters the defrosting mode, the controller can obtain the first temperature value at the current time through the first temperature sensor. In some embodiments, the manner in which the controller obtains the first temperature value may, for example, be that the first temperature sensor sends the detected temperature value to the controller at a preset time interval. In some embodiments, the preset time interval may, for example, be 1 second. In some embodiments, the controller can send a detection instruction to the first temperature sensor at the current time, so that the first temperature sensor can detect the temperature value at the location thereof based on the detection instruction and send the temperature value to the controller.

[0121] S602, obtaining a second temperature value detected by the first temperature sensor at a first time, the first time being a time before the current time by a preset time length. That is, the first time refers to a time obtained by moving forward a preset time length with respect to the current time.

[0122] In some embodiments, the controller can obtain the second temperature value detected by the first temperature sensor at the first time after obtaining the first temperature value, so that the controller can determine whether the defrosting is completed according to the first temperature value and the second temperature value. It can be understood that the preset time length is less than the time length between the time when the refrigeration system enters the defrosting mode and the current time.

[0123] S603, determining a first temperature change rate according to the first temperature value and the second temperature value through a change rate algorithm. In some embodiments, the change rate algorithm can be formula (1) or formula (2) as follows. The change rate algorithm can also be a variant algorithm or formula based on formula (1) and / or formula (2).

[0124] In some embodiments, the controller can determine the temperature change rate according to the following formula (1):

[0125] wherein T2 is the second temperature value, T1 is the first temperature value, and vt is the first temperature change rate.

[0126] In some embodiments, the controller can determine the temperature change rate according to the following formula (2):

[0127] wherein T2 is a second temperature value, T1 is a first temperature value, vt is a first temperature change rate, and t2-t1 is a time length between a current time and a first time.

[0128] S604, determining whether defrosting is completed according to the first temperature change rate.

[0129] In some embodiments, the controller can compare the first temperature change rate with a preset value. In some embodiments, if the first temperature change rate is greater than the preset value, it indicates that the temperature value of the inlet of the evaporator changes greatly in the time period from the first time to the current time, and it can be determined that the defrosting is completed. If the first temperature change rate is less than the preset value, it indicates that the temperature value of the inlet of the evaporator changes less in the time period, and it indicates that the frost of the evaporator is not completely melted, and it can be determined that the defrosting is not completed.

[0130] In some embodiments, the preset value can include a first threshold value and a second threshold value. If the controller determines the first temperature change rate according to formula (1), the first threshold value can be determined according to the size of the preset time length, and whether the defrosting is completed can be determined according to the first threshold value. For example, the greater the preset time length, the greater the determined first threshold value. For example, if the preset time length is 30 seconds, the first threshold value can be set to 30% or any value within a preset numerical range of 30%. If the preset time length is 1 minute, the first threshold value can be set to 50% or any value within a preset numerical range of 50%.

[0131] In some embodiments, if the controller determines the first temperature change rate according to formula (2), the second threshold value can be determined according to the size of the preset time length, and whether the defrosting is completed can be determined according to the second threshold value. For example, the greater the preset time length, the smaller the determined second threshold value. For example, if the preset time length is 1 minute, the second threshold value can be set to 5% or any value within a preset numerical range of 5%. If the preset time length is 4 minutes, the second threshold value can be set to 2% or any value within a preset numerical range of 2%.

[0132] In some embodiments, the controller can determine the preset value in the correspondence between the preset time length and the first threshold value and the second threshold value. It can be understood that the correspondence includes a plurality of preset time length ranges and the first threshold value and the second threshold value corresponding to each preset time length range. The controller can determine the first threshold value or the second threshold value according to the range in which the preset time length is located.

[0133] S605, if it is determined that the defrosting is completed, controlling the refrigeration system to exit the defrosting mode.

[0134] In some embodiments, a humidity sensor is added at or near the evaporator inlet, and differential pressure sensors are added before and after the defrost branch. The controller 104 reads the humidity value and the branch pressure difference at the corresponding time while acquiring the temperature value each time. If the temperature change rate is close to the threshold critical zone and the humidity decreases by more than a preset proportion or the pressure difference decreases by more than a preset threshold, it can be determined that the defrosting is completed, reducing the dependence on the measurement error of a single temperature sensor. The controller 104 dynamically adjusts the threshold of this defrosting in combination with historical defrosting data (including ambient temperature, humidity, door opening times, duration, etc.) and the current preset duration. Through an exponentially weighted moving average or a simple linear regression model, the threshold correspondence is continuously optimized in multiple defrostings to improve the accuracy of determination.

[0135] In some embodiments, upon determining that the defrosting is completed, the controller can control the refrigeration system to exit the defrosting mode. In some embodiments, the controller can control the refrigeration system to exit the refrigeration mode, for example, by controlling the electromagnetic valve to make the compressor communicate with the condenser, so that the refrigerant flowing out of the compressor passes through the condenser, and the compressor is turned off. In some embodiments, after the refrigeration system exits the defrosting mode, the controller can control the refrigeration system to enter the refrigeration mode, for example, the controller can control the on-off valve to open, so that the first branch flows, and control the compressor to start.

[0136] In some embodiments, the controller can obtain a first temperature value at the current time through the first temperature sensor after the refrigeration system enters the defrosting mode, and obtain a second temperature value detected by the first temperature sensor at the first time. According to the first temperature value and the second temperature value, the first temperature change rate is determined, and whether the defrosting is completed is determined according to the first temperature change rate. If yes, the refrigeration system is controlled to exit the defrosting mode. Some embodiments of the present application determine whether the defrosting is completed according to the change rate of the temperature value of the exhaust port of the evaporator, and end the defrosting in time when the defrosting is determined to be completed, so as to realize the control of the defrosting and improve the reliability of the defrosting.

[0137] In some embodiments, the preset time length is 1 / n of the defrosting experience time length, where n is an integer greater than or equal to 2. The defrosting experience time length can be an average of the time lengths required for defrosting of a plurality of refrigerators, which can be understood as refrigerators of the same specification as the refrigerator 10. In some embodiments, if the defrosting experience time length is 15 minutes, when n is 2, the preset time length is 7.5 minutes, indicating that the refrigerator can perform detection of whether the defrosting is completed every 7.5 minutes. Then, after entering the defrosting mode, the time of the second detection is near the time of completing defrosting, and the probability of detecting completion of defrosting is relatively large. When n is 3, the preset time length is 5 minutes, indicating that the refrigerator can perform detection of whether the defrosting is completed every 5 minutes. Then, after entering the defrosting mode, the time of the third detection is near the time of completing defrosting, and the probability of detecting completion of defrosting is relatively large. According to the defrosting experience time length to determine the time interval of defrosting judgment (i.e., the preset time length), long-time defrosting can be avoided, and energy consumption can be saved.

[0138] It can be understood that, taking the defrosting experience time length of 15 minutes as an example, if the preset time length is 10 minutes, the refrigerator will perform detection of whether the defrosting is completed every 10 minutes. Then, at the first detection, if the evaporator is not detected to complete defrosting, the second detection is at the 20th minute after entering the defrosting mode. In this case, the defrosting time can be too long.

[0139] In some embodiments, the preset time length can be the integer value obtained by rounding up 1 / n of the defrosting experience time length, so as to facilitate the controller to perform detection of whether the defrosting is completed. During the defrosting process, when ice and frost are formed on the evaporator, the temperature of the air inlet of the evaporator (which is the air outlet during defrosting) fluctuates within a certain temperature range. During the period when the ice and frost are about to melt (from the time when the defrosting is about to complete to the time when the defrosting is completed), the temperature will increase by a large amplitude, i.e., there is a rapid temperature changing period. In some embodiments, as shown in FIG. 7, the time period from time ta to time tb can be the rapid temperature changing period. During this period, due to the fact that the defrosting is about to be completed (there is a small amount of ice and frost to complete melting of the ice and frost), the temperature changes rapidly. The time length corresponding to the rapid temperature changing period can be the time length between time ta and time tb. In some embodiments, the time length corresponding to the rapid temperature changing period can be determined according to the time length corresponding to the rapid temperature changing period monitored by multiple defrosting of a plurality of refrigerators. It can be understood that the plurality of refrigerators are refrigerators of the same specification as the refrigerator 10. For example, the time length corresponding to the rapid temperature changing period is 3 minutes. Further, when the preset time length is less than the time length corresponding to the rapid temperature changing period, the controller can determine whether the defrosting is completed according to a plurality of temperature change rates, so as to improve the accuracy of the judgment. The time corresponding to the temperature values used to determine the plurality of temperature change rates is a continuous time.

[0140] FIG. 8 is a flowchart of a control method of a refrigerator according to some embodiments of the present application. The method can be executed by a controller of the refrigerator. As shown in FIG. 8, the method can include the following steps.

[0141] S801, obtaining at least one second temperature change rate.

[0142] In some embodiments, the at least one second temperature change rate is a change rate of temperature values corresponding to each two adjacent time points in a plurality of time points before the first time point. The time length between any two adjacent time points in the plurality of time points is a preset time length. After determining the first temperature change rate, the controller can obtain the at least one second temperature change rate. In some embodiments, FIG. 9 is a schematic diagram of the plurality of time points before the first time point according to some embodiments of the present application. It can be understood that the at least one second temperature change rate and the first temperature change rate are a plurality of continuous temperature change rates, i.e., the time points corresponding to the temperature values used to determine the at least one second temperature change rate and the first temperature change rate are continuous time points.

[0143] In some embodiments, the controller can obtain the at least one second temperature change rate from a preset memory. Taking the second temperature change rate of the time period from the first time point to the time point before the first time point as an example, after determining the second temperature change rate, the controller can store the second temperature change rate in the preset memory. It can be understood that when storing the second temperature change rate, the controller can correspondingly store the first time point corresponding to the second temperature change rate, so as to facilitate subsequent reading to determine whether defrosting is completed.

[0144] In some embodiments, since the time length corresponding to the rapid temperature change period is relatively short, the number of second temperature change rates can be 1 or 2. In some embodiments, the number of second temperature change rates can be determined according to the preset time length and the time length corresponding to the rapid temperature change period, so as to avoid that the number of second temperature change rates is too large or too small, which is not convenient for the controller to determine. For example, if the preset time length is 5 minutes and the time length corresponding to the rapid temperature change period is 2 minutes, the number of second temperature change rates can be 2, so that the number of temperature change rates used to determine whether defrosting is completed is 3 (including the first temperature change rate). If the preset time length is 5 minutes and the time length corresponding to the rapid temperature change period is 3 minutes, the number of second temperature change rates can be 1, so that the number of temperature change rates used to determine whether defrosting is completed is 2 (including the first temperature change rate). In some embodiments, the ratio of the preset time length to the time length corresponding to the rapid temperature change period can be rounded up, so as to obtain the number of temperature change rates used to determine whether defrosting is completed.

[0145] S802, determining whether the at least one second temperature change rate and the first temperature change rate are above a preset value.

[0146] If yes, S803 is executed.

[0147] In some embodiments, if there is a change rate less than the preset value in the at least one second temperature change rate and the first temperature change rate, it can be determined that the defrosting is not completed, that is, no action is performed, and the controller can continue to determine whether the defrosting is completed by the temperature value detected by the first temperature sensor at the next moment of the current moment. It can be understood that the next moment can be a moment after a preset time length of the current moment.

[0148] In some embodiments, if there is a change rate less than the preset value in the at least one second temperature change rate and the first temperature change rate, the controller can obtain a current defrosting time length and determine whether the current defrosting time length reaches a preset defrosting time length. If the current defrosting time length reaches the preset defrosting time length, it means that the refrigeration system has entered the defrosting mode for a long time, and it can be determined whether the first temperature value is greater than or equal to a preset temperature value. If the first temperature value is greater than or equal to the preset temperature value, it is determined that the defrosting is completed. If the first temperature value is less than the preset temperature value, it is determined that the defrosting is not completed. The current defrosting time length is the time length between the current moment and the moment when the refrigeration system enters the defrosting mode. The current defrosting time length can refer to FIG. 9. In some embodiments, the preset temperature value can be the temperature of the air inlet of the evaporator when the frost on the evaporator is completely melted. Since the refrigeration mode is not entered at this time, the temperature at this time can be 1°C, or 2°C, etc. If the current defrosting time length does not reach the preset defrosting time length, the controller can continue to determine whether the defrosting is completed by the temperature value detected by the first temperature sensor at the next moment of the current moment.

[0149] In some embodiments, if there is a change rate less than the preset value in the plurality of continuous change rates, it can be determined whether the current defrosting time length reaches the preset defrosting time length. If yes, it is directly determined whether the defrosting is completed according to the first temperature value, so as to avoid the situation that the refrigeration system fails (the refrigerator leaks cold to cause a large amount of frost or refrigerant leaks, etc. unable to detect temperature rise), and the long-time reverse defrosting causes the frozen food in the storage compartment to melt.

[0150] S803, determining that the defrosting is completed.

[0151] In some embodiments, if the at least one second temperature change rate and the first temperature change rate are greater than the preset value, it indicates that the temperature change rate in the plurality of preset time periods is large, i.e., the temperature rises, and it can be determined that the defrosting is completed. In some embodiments, when the preset time period is less than the time period corresponding to the rapid temperature change period, whether the defrosting is completed can be determined according to the plurality of continuous change rates, which can further improve the accuracy of the defrosting judgment, thereby realizing defrosting and saving energy consumption. However, in the defrosting mode, i.e., the process of reversing the flow of refrigerant for evaporator defrosting, the refrigerant cannot be completely evaporated in the heat exchanger (evaporator and condenser), resulting in liquid in the return gas of the compressor, which causes liquid impact phenomenon of the compressor and damages the compressor.

[0152] To protect the compressor, the controller can protect the compressor by controlling the flow rate of the refrigerant flowing to the condenser. In some embodiments, the controller can control the flow rate of the refrigerant flowing to the condenser before entering the defrosting mode and / or in the defrosting mode to protect the compressor. The following is a method for the controller to control the flow rate of the refrigerant flowing to the condenser to be a first flow rate before entering the defrosting mode to protect the compressor.

[0153] FIG. 10 is a flowchart of a control method of a refrigerator according to some embodiments of the present application. The method can be performed by the controller of the refrigerator described above. As shown in FIG. 10, the method can include the following steps.

[0154] S1001, when it is detected that the evaporator has a defrosting demand, obtaining a first pressure value through a first pressure sensor and a second pressure value through a second pressure sensor.

[0155] In some embodiments, when it is detected that the evaporator has a defrosting demand, the controller can obtain the first pressure value and the second pressure value before entering the defrosting mode, so as to determine whether the pressure of the refrigerant inside the refrigeration system reaches balance according to the pressure values of the discharge port and the return port of the compressor, thereby avoiding fluctuations in the pressure inside the refrigerant due to the change in the flow direction of the refrigerant when the refrigeration system is switched from the refrigeration mode to the defrosting mode.

[0156] S1002, determining whether the difference between the first pressure value and the second pressure value is less than a preset difference value.

[0157] If yes, S1003 is performed.

[0158] In some embodiments, if the difference between the first pressure value and the second pressure value is less than the preset difference value, it indicates that the pressure difference between the discharge port and the return port of the compressor is small, and it can be considered that the pressure in the refrigeration system is balanced, and S1003 can be performed. If the difference between the first pressure value and the second pressure value is greater than or equal to the preset difference value, it indicates that the pressure difference between the discharge port and the return port of the compressor is large, and the controller can continue to monitor the pressure difference between the discharge port and the return port of the compressor through the first pressure sensor and the second pressure sensor until the pressure difference between the discharge port and the return port of the compressor is less than the preset difference value.

[0159] S1003, control the flow of the flow regulating valve to be a first flow.

[0160] In some embodiments, after the pressure is balanced, the flow of the flow regulating valve is controlled to be a first flow, which is less than the maximum flow of the flow regulating valve. In the case of reducing the accumulation of liquid refrigerant after pressure balancing, reducing the flow rate can further reduce the risk of liquid refrigerant entering the compressor, thereby reducing the risk of liquid knock in the compressor.

[0161] S1004, control the electromagnetic valve to make the compressor communicate with the evaporator, and control the compressor to start.

[0162] In some embodiments, after adjusting the flow of the flow regulating valve, the controller can control the electromagnetic valve to make the compressor communicate with the evaporator, and control the compressor to start, thereby entering the defrosting mode. In some embodiments, the controller can also control the on-off valve to open to turn on the first branch. In some embodiments, when it is detected that the evaporator has a defrosting demand, the pressure balance degree of the refrigeration system can be determined according to the pressure difference between the return port and the discharge port of the evaporator, and when the pressure is basically balanced, the flow of the flow regulating valve can be controlled to be a preset flow, and then the compressor and the electromagnetic valve are switched to defrost, which can reduce the risk of liquid knock in the compressor due to insufficient heat utilization or insufficient gasification of return air caused by too fast flow rate.

[0163] In some embodiments, when it is detected that the evaporator has a defrosting demand, the controller can obtain the state of the compressor. If the state of the compressor is started, when the refrigeration system exits the refrigeration mode, the state of the compressor is controlled to be stopped, and the flow of the flow regulating valve is controlled to be a second flow, which is greater than the first flow. The state of the compressor is started or stopped.

[0164] It can be understood that when it is detected that the evaporator has a defrosting demand, it can be detected when the refrigeration system is in the refrigeration mode. The compressor can be stopped and the flow of the flow regulating valve can be controlled to be a second flow when the refrigeration system exits the refrigeration mode. The second flow can be the maximum flow of the flow regulating valve to increase the flow rate, which can increase the speed of pressure balance in the refrigeration system.

[0165] In some embodiments, if the state of the compressor is off when the evaporator is detected to have a defrosting demand, the pressure values of the first pressure sensor and the second pressure sensor can be directly obtained to determine whether the pressure inside the refrigeration system reaches equilibrium, without the need to control the flow of the flow regulating valve to be the maximum flow, thereby simplifying the processing flow of the controller.

[0166] The following is a control method of the refrigerator provided by some embodiments of the present application, which can be executed by the controller of the refrigerator. As shown in FIG. 11, the method can include the following steps.

[0167] FIG. 11 is a flowchart of a control method of a refrigerator according to some embodiments of the present application, which can be executed by the controller of the refrigerator. As shown in FIG. 11, the method can include the following steps.

[0168] S1101, obtaining a third temperature value of the second temperature sensor and a third pressure value of the second pressure sensor after the compressor is turned on.

[0169] In some embodiments, the controller can obtain the third temperature value and the third pressure value in the following manner, for example: the second temperature sensor sends the detected temperature value to the controller at a preset time interval, and the second pressure sensor sends the detected pressure value to the controller at a preset time interval. In some embodiments, the preset time interval can be 1 second, for example.

[0170] S1102, determining the critical temperature of the saturated gaseous refrigerant corresponding to the third pressure value.

[0171] In some embodiments, the controller can determine the critical temperature of the saturated gaseous refrigerant corresponding to the third pressure value according to the pressure-temperature correspondence relationship. In some embodiments, the pressure-temperature correspondence relationship includes a plurality of pressure values and the critical temperature of the saturated gaseous refrigerant corresponding to each pressure value. Table 1 is a pressure-temperature correspondence relationship according to some embodiments of the present application. Alternatively, the preset correspondence relationship is a plurality of pressure ranges and the critical temperature of the saturated gaseous refrigerant corresponding to each pressure range. Table 2 is another pressure-temperature correspondence relationship according to some embodiments of the present application.

[0172] Table 1

[0173] Table 2

[0174] Wherein, P1, P2, P3, P4, P5 and P6 are different pressure values, and t1, t2 and t3 are different temperature values.

[0175] S1103, if the third temperature value is less than or equal to the critical temperature, controlling the flow of the flow regulating valve to be the third flow.

[0176] In some embodiments, if the third temperature value is less than the critical temperature value, it indicates that the return refrigerant of the compressor contains liquid, usually in a gas-liquid mixed state, and the compressor has a risk of liquid hammering, which is usually caused by excessive refrigerant content in the reverse circulation in the refrigeration system. In this case, the opening of the flow regulating valve can be controlled to be smaller, that is, the flow of the controller is the third flow.

[0177] In some embodiments, if the flow of the flow regulating valve is adjusted to the first flow by the controller before entering the defrosting mode, the third flow can be less than the first flow, that is, the flow of the flow regulating valve is further adjusted to reduce the risk of liquid hammering of the compressor.

[0178] In some embodiments, the third flow can be equal to the first flow, that is, the flow of the flow regulating valve is not adjusted by the controller before entering the defrosting mode. The controller can adjust the flow of the flow regulating valve to the third flow, which reduces the refrigerant flow to a smaller extent, and ensures the efficiency of defrosting while reducing the risk of liquid hammering of the compressor.

[0179] In some embodiments, the controller can determine the third flow by the following method:

[0180] The controller obtains the ambient temperature of the environment in which the refrigerator is located, and determines the target adjustment range in the preset corresponding relationship according to the ambient temperature. The preset corresponding relationship includes a plurality of ambient temperatures and the flow adjustment range corresponding to each ambient temperature. Then, according to the initial flow and the target adjustment range, the third flow is determined by the flow algorithm.

[0181] In some embodiments, the flow algorithm can be formula (3) as follows, that is, the controller can determine the third flow according to the following formula (3): q1=q0×b% (3)

[0182] Wherein, q1 is the third flow, q0 is the initial flow, and b% is the target adjustment range. The initial flow can be the first flow or the second flow. In some embodiments, the preset corresponding relationship includes a plurality of ambient temperature values and the flow adjustment range corresponding to each ambient temperature. Table III is a preset corresponding relationship in some embodiments of the present application. Alternatively, the preset corresponding relationship is a plurality of ambient temperature ranges and the flow adjustment range corresponding to each ambient temperature range. Table IV is another preset corresponding relationship in some embodiments of the present application.

[0183] In some embodiments, after the compressor is started, i.e. during the defrosting process, whether the refrigerant in the return gas pipe of the compressor contains liquid can be determined according to the pressure of the refrigerant in the return gas pipe of the compressor and the temperature of the return gas pipe. When the refrigerant contains liquid, the flow of the refrigerant can be reduced by the flow regulating valve, so as to reduce the risk of liquid impact of the compressor.

[0184] Table III

[0185] Wherein, T1 < T2 < T3, c1% > c2% > c3%.

[0186] Table IV

[0187] Wherein, T1 < T2 < T3 < T4 < T5 < T6, c1% > c2% > c3%.

[0188] In some embodiments, FIG. 12 is a schematic diagram of the installation of a pressure sensor according to some embodiments of the present application. As shown in FIG. 12, taking the first pressure sensor 41 as an example, the first pressure sensor 41 can include a pressure sensitive component 411 and an electrical signal processing component 412 electrically connected to the pressure sensitive component 411. The pressure sensitive component 411 is connected to the first end of the preset pipeline, and the detection part of the pressure sensitive component 411 is in contact with the refrigerant in the preset pipeline. The pipeline between the second end and the third end of the preset pipeline is fixedly arranged in series in the exhaust pipeline close to the exhaust port of the compressor 31. In some embodiments, the electrical signal processing component 412 is electrically connected to the controller 104, and the electrical signal processing component 412 is configured to:

[0189] receive the electrical signal sent by the pressure sensitive component 411, the electrical signal being converted by the pressure sensitive component 411 according to the detected pressure signal;

[0190] According to the electrical signal, a digital signal is sent to the controller 104, and the digital signal is used to determine the pressure value.

[0191] In some embodiments, as shown in FIG. 12, the preset pipeline is a T-shaped pipeline. The above arrangement can realize the detection of the pressure value of the refrigerant in the exhaust port of the compressor 31 by the pressure sensor. In some embodiments, the structure and arrangement of the second pressure sensor 42 are similar to those of the first pressure sensor 41, which will not be described here.

[0192] Some embodiments of the present application further provide a computer readable storage medium, which can include: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes, and the like. Specifically, the computer readable storage medium stores computer execution instructions, and the computer execution instructions are executed by a computer to implement the technical solutions shown in the above method embodiments.

[0193] Some embodiments of the present application further provide a program product, which includes execution instructions stored in a readable storage medium, and the computer program is executed by a computer to implement the technical solutions shown in the above method embodiments.

[0194] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the same; although the above-mentioned embodiments of the present application have been described in detail, those skilled in the art should understand that the technical solutions recorded in the above-mentioned embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0195] For the convenience of explanation, the above description has been made in combination with specific embodiments. However, the above description in some embodiments is not intended to exhaust or limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained according to the above teachings. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different modified embodiments suitable for specific use considerations.

[0196] In the present application, "and / or" is only used to describe the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can mean that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper represents that the front and rear associated objects are a "or" relationship.

[0197] "at least one" or the like refers to any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b or c can mean: a, b, c, a and b, a and c, b and c, or a, b and c, wherein each of a, b and c can be an element or a set containing one or more elements.

[0198] In some embodiments of the present application, "at least one" means one or more. "Multiple" means two or more. In some embodiments of the present application, the description of a first and a second, and so on, is merely intended to distinguish between objects, and does not mean a particular order, nor indicates a particular limitation on the number of the devices in some embodiments of the present application, and cannot constitute any limitation on some embodiments of the present application. For example, the first threshold and the second threshold are merely used to distinguish different thresholds, and do not mean that the two thresholds are different in size, priority or importance, etc.

[0199] In some embodiments of the present application, "exemplary", "in some embodiments", and "in other embodiments" are used to indicate an example, illustration, or description. Any embodiment or design scheme described as "exemplary" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of the word "exemplary" is intended to present the concept in a specific manner.

[0200] In the present application, "of", "corresponding", "relevant", and "corresponding" can be used interchangeably, and it should be pointed out that when the distinction is not emphasized, the meanings expressed are consistent. In some embodiments of the present application, communication and transmission can be used interchangeably, and it should be pointed out that when the distinction is not emphasized, the meanings expressed are consistent. For example, transmission can include sending and / or receiving, and can be a noun or a verb.

Claims

1. A refrigerator, comprising: Box; Evaporator, the evaporator being located inside the housing; A first temperature sensor is installed on the air inlet pipe of the evaporator and configured to detect the temperature value at the air inlet of the evaporator. The controller, electrically connected to the first temperature sensor, is configured to: After the refrigerator enters defrost mode, the first temperature value at the current moment is obtained. The first temperature value is the temperature value read by the first temperature sensor at the current moment. Obtain the second temperature value at the first moment, which is the temperature value read by the first temperature sensor at the first moment; The first moment refers to the moment obtained by shifting forward by a preset time period relative to the current moment; Based on the first temperature value and the second temperature value, the first temperature change rate is determined using a change rate algorithm; Based on the first temperature change rate, compare it with the preset value to determine whether defrosting is complete; When the first temperature change rate is greater than the preset value, the refrigerator is controlled to exit the defrost mode; wherein, the defrost mode is the working state activated by the refrigerator during the cooling process to remove the frost on the evaporator.

2. The refrigerator according to claim 1, further comprising: The compressor is located inside the housing; A condenser, located inside the housing; A solenoid valve is disposed between the compressor and the condenser and the evaporator, the solenoid valve selectively connecting the compressor to the condenser or connecting the compressor to the evaporator.

3. The refrigerator according to claim 2, wherein, When the refrigerator is in cooling mode, the solenoid valve connects the compressor to the condenser, and the refrigerant flowing from the compressor passes through the condenser; when the refrigerator is in defrosting mode, the solenoid valve connects the compressor to the evaporator, and the refrigerant flowing from the compressor passes through the evaporator.

4. The refrigerator according to claim 1, wherein, The preset duration is 1 / n of the defrosting experience duration, where n is an integer greater than or equal to 2.

5. The refrigerator according to claim 4, wherein, When the preset duration is less than the duration corresponding to the rapid temperature change period; The controller is configured to: At least one second temperature change rate is obtained, wherein the at least one second temperature change rate is the rate of change of temperature value corresponding to every two adjacent moments in a plurality of moments before the first moment; the duration between any two adjacent moments in the plurality of moments is the preset duration; Determine whether the at least one second temperature change rate and the first temperature change rate are above the preset value; If the at least one second temperature change rate and the first temperature change rate are both above the preset value, then defrosting is determined to be complete. If either the at least one second temperature change rate or the first temperature change rate is less than the preset value, then defrosting is determined to be incomplete.

6. The refrigerator according to claim 5, wherein, The controller is also configured to: If there is a rate of change of less than the preset value among the at least one second temperature change rate and the first temperature change rate, the current defrost duration is obtained, and the current defrost duration is the duration between the current moment and the moment when the refrigeration system enters the defrost mode. Determine whether the current defrosting time has reached the preset defrosting time; If the current defrosting time reaches the preset defrosting time, then determine whether the first temperature value is greater than or equal to the preset temperature value; If the first temperature value is greater than or equal to the preset temperature value, then defrosting is determined to be complete; If the first temperature value is less than the preset temperature value, then defrosting is determined to be incomplete.

7. The refrigerator according to any one of claims 2-6, further comprising: A flow regulating valve is disposed between the condenser and the evaporator; A first pressure sensor is installed on the exhaust pipe connecting the compressor and the solenoid valve; The second pressure sensor is installed on the return gas pipeline connecting the compressor and the solenoid valve; The first pressure sensor and the second pressure sensor are electrically connected to the controller, respectively. The controller is also configured to: When a defrosting requirement is detected in the evaporator, a first pressure value is obtained through the first pressure sensor, and a second pressure value is obtained through the second pressure sensor; Determine whether the difference between the first pressure value and the second pressure value is less than a preset difference; If the difference is less than the preset difference, then the flow rate of the flow regulating valve is controlled to be the first flow rate; The solenoid valve is controlled to connect the compressor to the evaporator and to start the compressor.

8. The refrigerator according to claim 7, wherein, The controller is also configured to: When a defrosting requirement is detected in the evaporator, the status of the compressor is obtained, which is either on or off. If the compressor is in the "on" state, when the refrigeration system exits the refrigeration mode, the compressor is controlled to be in the "off" state, and the flow rate of the flow regulating valve is controlled to be the second flow rate, which is greater than the first flow rate.

9. The refrigerator according to claim 7 or 8, further comprising: A second temperature sensor is disposed on the return gas pipeline connecting the compressor and the solenoid valve and adjacent to the second pressure sensor. The second temperature sensor is configured to detect the temperature value at the return gas port of the compressor and is electrically connected to the controller. The controller is also configured to: After the compressor is started, the third temperature value of the second temperature sensor and the third pressure value of the second pressure sensor are obtained. Determine the critical temperature of the saturated gaseous refrigerant corresponding to the third pressure value; If the third temperature value is less than or equal to the critical temperature, then the flow rate of the flow regulating valve is controlled to be the third flow rate.

10. The refrigerator according to claim 9, wherein, The controller is configured to: Obtain the ambient temperature of the environment where the refrigerator is located; The target adjustment range is determined based on the ambient temperature in a preset correspondence, wherein the preset correspondence includes multiple ambient temperatures and the flow adjustment range corresponding to each ambient temperature; The third flow rate is determined using a flow algorithm based on the initial flow rate and the target adjustment range.

11. The refrigerator according to claim 7, wherein, A second branch and a first branch are provided in parallel between the condenser and the evaporator; a first dryer filter is provided on the second branch, and a switching valve, a throttling device and a second dryer filter are provided on the first branch; wherein, the flow regulating valve is provided on the second branch and between the condenser and the first dryer filter; When the refrigerator is in the cooling mode, the switch valve is in the open state, and the solenoid valve connects the compressor and the condenser. The refrigerant flowing out of the compressor passes through the condenser, the first branch, the second branch, and flows to the evaporator through the air inlet of the evaporator. When the refrigerator is in defrost mode, the switch valve is closed, and the solenoid valve connects the compressor and the evaporator. The refrigerant flowing from the compressor passes through the outlet of the evaporator, the inlet of the evaporator, and the second branch, and flows to the condenser.

12. The refrigerator according to claim 2, wherein, The compressor, the condenser, the evaporator, and the solenoid valve constitute a refrigeration system.

13. A method for controlling a refrigerator, the refrigerator comprising: Box; An evaporator, wherein the evaporator is disposed within the housing; A first temperature sensor is installed on the air inlet pipe of the evaporator and configured to detect the temperature value of the air inlet of the evaporator. The method includes: After the refrigerator enters defrost mode, the first temperature value at the current moment is obtained. The first temperature value is the temperature value read by the first temperature sensor at the current moment. The second temperature value at the first moment is obtained, which is the temperature value read by the first temperature sensor at the first moment; the first moment refers to the moment obtained by shifting forward by a preset time relative to the current moment; Based on the first temperature value and the second temperature value, the first temperature change rate is determined using a change rate algorithm; Based on the first temperature change rate, compare it with the preset value to determine whether defrosting is complete; When the first temperature change rate is greater than the preset value, the refrigerator is controlled to exit the defrost mode; wherein, the defrost mode is the working state activated by the refrigerator during the cooling process to remove the frost on the evaporator.

14. The control method according to claim 13, wherein, The refrigerator also includes: The compressor is located inside the housing; A condenser, located inside the housing; A solenoid valve is disposed between the compressor and the condenser and the evaporator, the solenoid valve selectively connecting the compressor to the condenser or connecting the compressor to the evaporator.

15. The control method according to claim 14, wherein, When the refrigerator is in cooling mode, the solenoid valve connects the compressor to the condenser, and the refrigerant flowing from the compressor passes through the condenser; when the refrigerator is in defrosting mode, the solenoid valve connects the compressor to the evaporator, and the refrigerant flowing from the compressor passes through the evaporator.

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