Refrigerator and refrigeration sensor fault protection method thereof

Abstract

The present invention discloses a refrigerator and a refrigeration sensor fault protection method thereof. When a refrigeration sensor in the refrigerator fails, based on the detected ambient temperature, freezing temperature, evaporation temperature and refrigeration set temperature, three parameters of the cabinet heat load, refrigeration cooling capacity and refrigeration heat exchange capacity are calculated. When the cabinet heat load, refrigeration cooling capacity and refrigeration heat exchange capacity satisfy the corresponding preset relationship, a control mode corresponding to the preset relationship is obtained. Therefore, even when the refrigeration sensor fails, the accurate operation of the compressor can be controlled according to the control mode, thereby realizing the control and protection of the temperature in the refrigeration chamber, not only ensuring the basic refrigeration demand of the refrigeration, but also ensuring that the refrigeration temperature still has a certain temperature control accuracy.

Description

Technical Field

[0001] The present invention relates to the field of refrigerators, and in particular to a refrigerator and a refrigeration sensor fault protection method thereof. Background Art

[0002] During refrigerator use, the compressor constantly runs and shuts down. Each cycle of the compressor running and shutting down is called a refrigeration cycle. In refrigerators that use a refrigeration sensor, the sensor monitors the temperature inside the refrigerator compartment and determines whether to start or stop the refrigeration system. During actual use, the refrigerator's refrigeration sensor may malfunction. When this happens, the refrigerator cannot perform normal refrigeration control due to a lack of accurate temperature feedback. The most common control method for refrigerators that fail refrigeration sensors is to maintain the temperature inside the refrigerator compartment by setting fixed on / off times. However, this control method cannot effectively provide feedback on the set temperature, rendering the refrigerator's refrigeration gear adjustment ineffective. Furthermore, when the same on / off times are used under different ambient temperatures, the actual temperature inside the refrigerator can vary significantly, potentially causing the temperature to become too high or cross zero, affecting the proper preservation of food. Summary of the Invention

[0003] The purpose of the embodiments of the present invention is to provide a refrigerator and a refrigeration sensor fault protection method thereof, which realizes the control and protection of the temperature inside the refrigeration chamber after the refrigeration sensor fails, not only ensuring the basic refrigeration requirements of the refrigeration, but also ensuring that the refrigeration temperature still has a certain temperature control accuracy.

[0004] To achieve the above object, an embodiment of the present invention provides a refrigerator, comprising:

[0005] a box body, wherein at least one storage compartment is formed in the box body, and the storage compartment includes at least a refrigeration compartment;

[0006] A refrigeration system comprising a compressor, a condenser, and an evaporator connected in sequence through pipelines, wherein the refrigeration system is used to provide cooling for the refrigerator;

[0007] An ambient temperature sensor is provided outside the refrigerator and is used to detect the ambient temperature of the environment in which the refrigerator is located;

[0008] A refrigeration sensor is provided in the refrigeration chamber and is used to detect the real-time refrigeration temperature of the refrigeration chamber;

[0009] a freezing temperature sensor, disposed in the freezing chamber, for detecting the freezing temperature of the freezing chamber;

[0010] an evaporation temperature sensor, disposed in the evaporator, for detecting the evaporation temperature of the evaporator;

[0011] The controller is configured as:

[0012] When a refrigeration sensor failure is detected, the heat load of the cabinet is calculated according to the ambient temperature and the freezing temperature, the refrigeration capacity is calculated according to the basic parameters of the evaporator and the evaporation temperature, and the refrigeration heat exchange capacity is calculated according to the start and stop point temperatures of the refrigeration chamber;

[0013] When the cabinet heat load, the refrigeration capacity, and the refrigeration heat exchange capacity satisfy a corresponding preset relationship, obtaining a control mode corresponding to the preset relationship;

[0014] The refrigerator is controlled to operate according to the control mode.

[0015] The above technical solution has the following advantages or beneficial effects: when the refrigeration sensor in the refrigerator fails, based on the detected ambient temperature, freezing temperature, evaporation temperature and refrigeration set temperature, the three parameters of the cabinet heat load, refrigeration cooling capacity and refrigeration heat exchange are calculated. When the cabinet heat load, refrigeration cooling capacity and refrigeration heat exchange meet the corresponding preset relationship, the control mode corresponding to the preset relationship is obtained, so that when the refrigeration sensor fails, the compressor can be accurately controlled according to the control mode, thereby realizing the control and protection of the indoor temperature of the refrigeration chamber, not only ensuring the basic refrigeration needs of the refrigeration, but also ensuring that the refrigeration temperature still has a certain temperature control accuracy.

[0016] In some embodiments of the present application, the preset relationship includes a first relationship and a second relationship; wherein the first relationship satisfies: within a first time period, the refrigeration capacity is greater than or equal to the sum of the cabinet heat load and the refrigeration heat exchange capacity;

[0017] The second relationship expression satisfies the following conditions: in the second time period, the heat load of the cabinet is greater than or equal to the refrigeration heat exchange capacity.

[0018] The above technical solution has the following advantages or beneficial effects: by constructing the first relationship and the second relationship, and using the first relationship and the second relationship as the basis for position determination, when the actual temperature in the cold storage room cannot be known, a certain degree of self-correction of the temperature in the cold storage room is achieved.

[0019] In some embodiments of the present application, the controller is configured to:

[0020] When the refrigeration sensor fails, controlling the compressor to start;

[0021] When the cabinet heat load, the refrigeration capacity, and the refrigeration heat exchange capacity satisfy the first relationship, controlling the compressor to stop;

[0022] After the compressor is stopped, when the cabinet heat load and the refrigeration heat exchange capacity satisfy the second relationship, the compressor is controlled to start up.

[0023] The above technical solution has the following advantages or beneficial effects: since different relationship expressions correspond to different refrigerator control logics, the control logic completion when the refrigeration sensor fails is improved, and it can quickly switch to the appropriate control logic according to these relationship expressions, and the refrigeration temperature can still be controlled under certain conditions after the refrigeration sensor fails.

[0024] In some embodiments of the present application, the calculating the cabinet heat load according to the ambient temperature and the freezing temperature includes:

[0025] calculating a first temperature difference between the ambient temperature and the refrigeration set temperature;

[0026] calculating a second temperature difference between the freezing temperature and the refrigeration setting temperature;

[0027] The heat load of the cabinet is calculated using the first temperature difference and the second temperature difference.

[0028] The above technical solution has the following advantages or beneficial effects: the ambient temperature and the freezing temperature are used to calculate the heat load of the cabinet, so that the calculation result conforms to the actual heat load situation, thereby improving the control accuracy of the control logic.

[0029] In some embodiments of the present application, calculating the heat load of the cabinet according to the first temperature difference and the second temperature difference includes:

[0030] Obtaining an outer surface area of ​​the refrigerating chamber in the box and a first heat exchange area between the freezing chamber and the refrigerating chamber;

[0031] calculating a first product of the outer surface area, a first heat transfer coefficient, and the first temperature difference;

[0032] calculating a second product of the first heat exchange area, the second heat exchange coefficient, and the second temperature difference;

[0033] The sum of the first product and the second product is taken as the heat load of the box.

[0034] The above technical solution has the following advantages or beneficial effects: the outer surface area of ​​the refrigerator compartment and the first heat exchange area between the freezer compartment and the refrigerator compartment are used to further improve the calculation process of the cabinet heat load, thereby improving the reliability of the cabinet heat load calculation process.

[0035] In some embodiments of the present application, the basic parameters of the evaporator include a third heat exchange coefficient and a second heat exchange area of ​​the evaporator; and calculating the refrigeration capacity based on the basic parameters of the evaporator and the evaporation temperature includes:

[0036] calculating a third temperature difference between the return air corrected temperature and the evaporation temperature;

[0037] Calculate the product of the second heat exchange area, the third heat exchange coefficient and the third temperature difference to obtain the refrigeration capacity

[0038] The above technical solution has the following advantages or beneficial effects: the evaporator's own influencing factors and the evaporation temperature are used to calculate the refrigeration capacity, so that the calculation result is consistent with the actual refrigeration situation, thereby improving the control accuracy of the control logic.

[0039] In some embodiments of the present application, the return air correction temperature is calculated based on the refrigeration compartment air supply volume, the freezer compartment air supply volume, the freezing temperature and the refrigeration set temperature.

[0040] The above technical solution has the following advantages or beneficial effects: the calculation process of the refrigeration capacity is further improved by using the refrigeration compartment air supply volume, the freezer compartment air supply volume, the freezing temperature and the refrigeration set temperature, thereby improving the reliability of the refrigeration capacity calculation process.

[0041] In some embodiments of the present application, calculating the refrigeration heat exchange capacity according to the start and stop point temperatures of the refrigeration chamber includes:

[0042] Acquiring air parameters and the refrigerated storage volume of the refrigerated chamber;

[0043] Determining a fourth temperature difference according to the start and stop point temperatures;

[0044] The product of the air parameter, the refrigerated internal volume and the fourth temperature difference is calculated to obtain the refrigerated heat exchange capacity.

[0045] The above technical solution has the following advantages or beneficial effects: the refrigeration heat exchange capacity is calculated by using the start and stop point temperatures of the refrigeration chamber, the refrigeration internal volume and air parameters, so that the calculation result conforms to the actual refrigeration heat exchange capacity, thereby improving the control accuracy of the control logic.

[0046] In some embodiments of the present application, the air parameters include air density and air heat capacity.

[0047] The above technical solution has the following advantages or beneficial effects: the air parameters are characterized by air density and air heat capacity, thereby further improving the calculation process of the refrigeration heat exchange capacity and improving the reliability of the calculation process of the refrigeration heat exchange capacity.

[0048] To achieve the above objectives, an embodiment of the present invention provides a refrigerator refrigeration sensor fault protection method, comprising:

[0049] When a refrigeration sensor failure is detected in the refrigerator, the heat load of the cabinet is calculated based on the ambient temperature and the freezing temperature, the refrigeration capacity is calculated based on the basic parameters of the evaporator and the evaporation temperature, and the refrigeration heat exchange capacity is calculated based on the start and stop point temperatures of the refrigeration compartment;

[0050] When the cabinet heat load, the refrigeration capacity, and the refrigeration heat exchange capacity satisfy a corresponding preset relationship, obtaining a control mode corresponding to the preset relationship;

[0051] The refrigerator is controlled to operate according to the control mode.

[0052] The above technical solution has the following advantages or beneficial effects: when the refrigeration sensor in the refrigerator fails, based on the detected ambient temperature, freezing temperature, evaporation temperature and refrigeration set temperature, the three parameters of the cabinet heat load, refrigeration cooling capacity and refrigeration heat exchange are calculated. When the cabinet heat load, refrigeration cooling capacity and refrigeration heat exchange meet the corresponding preset relationship, the control mode corresponding to the preset relationship is obtained, so that when the refrigeration sensor fails, the compressor can be accurately controlled according to the control mode, thereby realizing the control and protection of the indoor temperature of the refrigeration chamber, not only ensuring the basic refrigeration needs of the refrigeration, but also ensuring that the refrigeration temperature still has a certain temperature control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 1 is a schematic diagram of the external structure of a refrigerator provided by an embodiment of the present invention;

[0054] Figure 2 This is a schematic diagram of the internal structure of a refrigerator provided by an embodiment of the present invention;

[0055] Figure 3 1 is a schematic structural diagram of a refrigeration system in a refrigerator provided by an embodiment of the present invention;

[0056] Figure 4 1 is a schematic diagram of the connection between the controller and its control components provided by an embodiment of the present invention;

[0057] Figure 5 This is a first working flow diagram of the controller provided by an embodiment of the present invention;

[0058] Figure 6 is a second working flow diagram of the controller provided by an embodiment of the present invention;

[0059] Figure 7 is a third working flow diagram of the controller provided in an embodiment of the present invention;

[0060] Figure 8 is a fourth working flow diagram of the controller provided in an embodiment of the present invention;

[0061] Figure 9 is a fifth working flow diagram of the controller provided in an embodiment of the present invention;

[0062] Figure 10 The present invention provides a flowchart of a refrigerator refrigeration sensor fault protection method.

[0063] Among them, 100, refrigerator; 10, touch screen; 20, controller; 30, memory; 40, damper; 401, refrigeration damper; 402, freezing damper; 50, fan; 60, refrigeration temperature sensor; 70, freezing temperature sensor; 80, ambient temperature sensor; 90, evaporation temperature sensor; 111, refrigerator compartment; 112, freezer compartment; 101, compressor; 102, evaporator; 103, capillary tube; 104, condenser. DETAILED DESCRIPTION

[0064] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0065] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0066] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0067] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0068] See also Figure 1 , Figure 1The figure below is a schematic diagram of the external structure of a refrigerator 100 provided in an embodiment of the present invention. The refrigerator 100 of this embodiment is approximately rectangular in shape and includes a housing defining a storage space and one or more doors located at the housing opening. The door comprises an outer door shell located on the outside of the housing, an inner door liner located on the inside of the housing, an upper end cover, a lower end cover, and an insulating layer located between the outer door shell, the inner door liner, the upper end cover, and the lower end cover. Typically, the insulating layer is filled with foam. The housing is provided with a chamber, which includes a component storage cavity for placing refrigerator components, such as a compressor compartment, and a storage space for storing food, etc.

[0069] See also Figure 2 , Figure 2 This is a schematic diagram of the internal structure of a refrigerator provided by an embodiment of the present invention. The storage space can be divided into multiple storage rooms. The storage rooms can be configured as a refrigerator room 111 and a freezer room 112 according to different uses. They can also include a temperature-changing room, a vacuum drawer, a moisturizing drawer, etc. Each storage room corresponds to one or more doors, for example, Figure 2 The storage room in the middle and upper part is provided with a double-door body. The door body can be pivotally arranged at the opening of the box body, and can also be opened in a drawer-like manner to realize drawer-like storage.

[0070] See also Figure 3 , Figure 3The structural diagram of the refrigeration system in the refrigerator 100 provided in the embodiment of the present invention is as follows: the refrigeration system includes a compressor 101, an evaporator 102, a drying filter (not shown in the figure), a capillary tube 103, a condenser 104 and a gas-liquid separator (not shown in the figure). The working process of the refrigeration system includes a compression process, a condensation process, a throttling process and an evaporation process. The compression process is as follows: when the power cord of the refrigerator is plugged in and the contacts of the thermostat are connected, the compressor 101 starts to work, and the low-temperature, low-pressure refrigerant is sucked into the compressor 101, and is compressed into a high-temperature, high-pressure superheated gas in the cylinder of the compressor 101 and then discharged into the condenser 104; the condensation process is as follows: the high-temperature, high-pressure refrigerant gas dissipates heat through the condenser 104, and the temperature continues to drop, and is gradually cooled to a saturated vapor of normal temperature and high pressure, and is further cooled to a saturated liquid, and the temperature no longer drops. The temperature at this time is called the condensation temperature, and the pressure of the refrigerant remains almost unchanged during the entire condensation process; the throttling ... The process is as follows: the saturated refrigerant liquid after condensation is filtered out of moisture and impurities through a drying filter and then flows into the capillary tube 103, through which it is throttled and depressurized, and the refrigerant becomes wet steam at room temperature and low pressure; the evaporation process is as follows: the wet steam at room temperature and low pressure begins to absorb heat and vaporize in the evaporator 102, which not only reduces the temperature of the evaporator 102 and its surroundings, but also turns the refrigerant into a low-temperature, low-pressure gas. The refrigerant coming out of the evaporator 102 passes through the gas-liquid separator and returns to the compressor 101 again, repeating the above process to transfer the heat in the refrigerator to the air outside the box, thereby achieving the purpose of refrigeration.

[0071] See also Figure 4 , Figure 4 : is a connection diagram of a controller and its control components provided by an embodiment of the present invention, wherein the refrigerator 100 includes:

[0072] A touch screen 10 is provided on one of the doors of the cabinet, and is used to display prompt information and receive touch operations of the user;

[0073] The controller 20 is provided in the housing and is used to receive detection data from the refrigeration temperature sensor 60, the freezing temperature sensor 70, the ambient humidity sensor 80, and the evaporation temperature sensor 90, and to control the opening and closing / closing of the damper 40 (including the refrigeration damper 401 and the freezing damper 402), the fan 50, and the compressor 101;

[0074] The memory 30 is used to store operating parameters of the refrigerator, such as the refrigeration temperature detected by the refrigeration temperature sensor 60, the freezing temperature detected by the freezing temperature sensor 70, the ambient temperature detected by the ambient temperature sensor 80, etc., as well as the fan 50 speed, the compressor 101 speed, the defrost time, etc.;

[0075] The damper 40 includes a refrigeration damper 401 and a freezing damper 402. The refrigeration damper 401 is provided in an air duct connected to the refrigeration chamber 111. When the refrigeration damper 401 is open, the cold air in the air duct can smoothly enter the refrigeration chamber 111. When the refrigeration damper 401 is closed, the cold air in the air duct cannot enter the refrigeration chamber 111. The freezing damper 402 is provided in an air duct connected to the freezing chamber 112. When the freezing damper 402 is open, the cold air in the air duct can smoothly enter the freezing chamber 112. When the freezing damper 402 is closed, the cold air in the air duct cannot enter the freezing chamber 112.

[0076] The fan 50 is provided in the air duct of the refrigerator, and is used to allow air to enter the evaporator 102 for heat exchange and send the heat-released air into the refrigerator storage room;

[0077] a refrigeration temperature sensor 60 , provided in the refrigeration chamber 111 , for detecting the refrigeration temperature of the refrigeration chamber 111 ;

[0078] A freezing temperature sensor 70 is provided in the freezing chamber 112 and is used to detect the freezing temperature of the freezing chamber 112;

[0079] An ambient temperature sensor 80 is provided outside the cabinet and is used to detect the ambient temperature of the environment in which the refrigerator is located. After sending this ambient temperature to the controller 20, the controller 20 can adjust its operating parameters according to the ambient temperature;

[0080] an evaporation temperature sensor 90 , disposed in the evaporator 102 , for detecting the evaporation temperature of the evaporator 102 ;

[0081] Furthermore, the refrigerator may also include a defrost heater (or not), which is located on one side of the evaporator. After the compressor has been operating for a period of time (about 8-10 hours), frost will form on the surface of the finned evaporator. If defrosting is not performed, the frost will become thicker and thicker, eventually filling the finned evaporator and blocking the air duct, preventing the cold air from circulating and reducing the cooling effect. The defrost timer automatically cuts off the power to the compressor after 8-10 hours, and connects the electric heating tube in the defrost heater. The heating tube heats up and melts the frost on the finned evaporator. After defrosting is completed, the defrost timer cuts off the power to the electric heating tube and connects the power to the compressor to resume cooling, and the cycle repeats.

[0082] Specifically, the controller 20 is configured to: when a failure of the refrigeration sensor is detected, calculate the cabinet heat load according to the ambient temperature and the freezing temperature, calculate the refrigeration cooling capacity according to the basic parameters of the evaporator and the evaporation temperature, and calculate the refrigeration heat exchange capacity according to the start and stop point temperatures of the refrigeration chamber; when the cabinet heat load, the refrigeration cooling capacity and the refrigeration heat exchange capacity satisfy the corresponding preset relationship, obtain the control mode corresponding to the preset relationship; and control the compressor according to the control mode.

[0083] For example, see Figure 5 , Figure 5 This is a first working flow diagram of the controller provided by an embodiment of the present invention. The controller 20 is configured to execute steps S11 to S16. After the refrigerator is turned on, the operating parameters in the refrigerator are first obtained. The operating parameters must include the detection data of the refrigeration temperature sensor. If the refrigerator does not obtain the detection data sent by the refrigeration temperature sensor within a period of time, it can be determined that the refrigeration temperature sensor has failed. At this time, the cabinet heat load is calculated according to the ambient temperature and the freezing temperature, the refrigeration cooling capacity is calculated according to the basic parameters of the evaporator and the evaporation temperature, and the refrigeration heat exchange capacity is calculated according to the start and stop point temperatures of the refrigeration chamber. Then, these three parameters are judged. When the corresponding relationship is satisfied, the corresponding control mode is started to control the operation of the compressor.

[0084] In an embodiment of the present invention, when a refrigeration sensor in a refrigerator fails, three parameters, namely, cabinet heat load, refrigeration cooling capacity and refrigeration heat exchange capacity, are calculated based on the detected ambient temperature, freezing temperature, evaporation temperature and refrigeration set temperature. When the cabinet heat load, refrigeration cooling capacity and refrigeration heat exchange capacity satisfy the corresponding preset relationship, a control mode corresponding to the preset relationship is obtained, so that even when the refrigeration sensor fails, the compressor can be accurately controlled according to the control mode, thereby realizing control and protection of the indoor temperature of the refrigerated room, which not only ensures the basic refrigeration requirements of the refrigeration, but also ensures that the refrigeration temperature still has a certain temperature control accuracy.

[0085] Specifically, the preset relationship includes a first relationship and a second relationship; wherein the first relationship satisfies: within a first time period, the refrigeration capacity is greater than or equal to the sum of the cabinet heat load and the refrigeration heat exchange capacity, and the first relationship satisfies the following formula:

[0086]

[0087] Wherein, t1 is the first time period; qF is the refrigeration capacity; qH is the box heat load; QR is the refrigeration heat exchange capacity;

[0088] The second relationship is satisfied: in the second time period, the box heat load is greater than or equal to the refrigeration heat exchange amount, and the second relationship satisfies the following formula:

[0089]

[0090] Among them, t2 is the second time period.

[0091] For example, see Figure 6 , Figure 6 This is a second workflow diagram of the controller provided in an embodiment of the present invention. When the refrigeration sensor fails, the controller 20 is further configured to execute step S121: controlling the compressor to start. When the cabinet heat load, the refrigeration cooling capacity, and the refrigeration heat exchange rate satisfy the first relationship, the controller 20 controls the compressor to stop. In this case, the first time period is the time period from the compressor starting up to the current moment after the refrigeration temperature sensor failure is detected. After the compressor stops, when the cabinet heat load and the refrigeration heat exchange rate satisfy the second relationship, the controller controls the compressor to start up. In this case, the second time period is the time period from the compressor stopping to the current moment.

[0092] Through the above formula, the embodiment of the present invention collects the ambient temperature, freezing temperature, and evaporation temperature in real time to calculate the refrigeration capacity, cabinet heat load, and required refrigeration heat exchange. After the refrigeration starts, the cabinet heat load and refrigeration heat exchange are the total amount of heat that needs to be overcome to achieve cooling. When the refrigeration capacity reaches or exceeds this total amount of heat (i.e., it satisfies the first relationship), it means that the refrigeration in the cabinet is completed. At this time, the refrigeration can be stopped and the compressor is controlled to stop. It is worth noting that this process does not need to detect whether it meets the second relationship. Even if it meets the second relationship, it is necessary to stop the refrigeration. After stopping the refrigeration, the required refrigeration heat exchange becomes the total refrigeration capacity in the cabinet. When the cabinet heat load reaches or exceeds it, it means that the cabinet has completed the temperature recovery. At this time, refrigeration needs to be started, i.e., the compressor needs to be controlled to start. Through the above control of refrigeration and temperature recovery, the start and stop of refrigeration is achieved.

[0093] In the embodiment of the present invention, by constructing the first and second relationship equations and using the first and second relationship equations as the basis for position determination, a certain degree of self-correction of the temperature inside the refrigerated room is achieved when the actual temperature inside the refrigerated room is unknown.

[0094] Specifically, the calculation of the cabinet heat load based on the ambient temperature and the freezing temperature includes: calculating a first temperature difference between the ambient temperature and the refrigeration setting temperature; calculating a second temperature difference between the freezing temperature and the refrigeration setting temperature; and calculating the cabinet heat load using the first temperature difference and the second temperature difference.

[0095] For example, see Figure 7 , Figure 7 This is the third workflow diagram of the controller provided in an embodiment of the present invention. The controller 20 is further configured to execute steps S211 to S213. At this time, the calculation of the cabinet heat load based on the first temperature difference and the second temperature difference includes: obtaining the outer surface area of ​​the refrigerator compartment and the first heat exchange area between the freezer compartment and the refrigerator compartment in the cabinet; calculating the first product of the outer surface area, the first heat exchange coefficient, and the first temperature difference; calculating the second product of the first heat exchange area, the second heat exchange coefficient, and the second temperature difference; and taking the sum of the first product and the second product as the cabinet heat load. The calculation process of the cabinet heat load qH satisfies the following formula:

[0096] qH=K1*A1*(T e -T r )+K2*A2*(T f -T r ) (3);

[0097] K1 is the first heat transfer coefficient between the environment and the refrigerator compartment. The first heat transfer coefficient is related to the material and thickness of the refrigerator and can be pre-stored when the refrigerator leaves the factory. A1 is the outer surface area of ​​the refrigerator compartment. T e The ambient temperature detected by the ambient temperature sensor; T r Set the temperature for refrigeration; K2 is the second heat transfer coefficient between the freezer and the refrigerator, which is related to the refrigerator model and can be pre-stored when the refrigerator leaves the factory; A2 is the first heat exchange area between the freezer and the refrigerator, which can be pre-stored when the refrigerator leaves the factory; T f The freezing temperature is detected by the freezing temperature sensor.

[0098] It is worth noting that in the embodiment of the present invention, when calculating the heat load of the cabinet, the refrigeration setting temperature is used instead of the actual temperature in the refrigeration room. If the refrigeration setting temperature is higher than the actual refrigeration temperature, qF is greater than the actual cooling capacity of the evaporator, while qH is less than the actual heat load. In practice, QR must be greater than the actual heat exchange rate, that is, the actual cooling temperature difference is less than the set refrigeration cooling temperature difference. In this way, the actual cooling temperature difference is reduced, while the return temperature difference remains unchanged, and the refrigeration temperature will gradually rise until it reaches or approaches the set temperature. Close to the actual temperature, so that the cooling temperature difference and the warming temperature difference are equal, and the temperature is close to stable; on the contrary, if the refrigeration set temperature is lower than the actual refrigeration temperature, the actual cooling temperature difference will be greater than the set temperature difference, causing the refrigeration temperature to gradually decrease and approach the set temperature.

[0099] In this embodiment of the present invention, different relationship equations correspond to different refrigerator control logics, improving control logic complementation in the event of a refrigeration sensor failure. These relationship equations allow for rapid switching to the appropriate control logic, enabling temperature control under certain conditions even after a refrigeration sensor failure. Furthermore, by using ambient and freezer temperatures to calculate the heat load of the cabinet, the calculated results align with the actual heat load, thereby improving the control logic's accuracy.

[0100] Specifically, the basic parameters of the evaporator include the third heat exchange coefficient and the second heat exchange area of ​​the evaporator; the calculation of the refrigeration capacity based on the basic parameters of the evaporator and the evaporation temperature includes: calculating the third temperature difference between the return air correction temperature and the evaporation temperature; calculating the product of the second heat exchange area, the third heat exchange coefficient and the third temperature difference to obtain the refrigeration capacity.

[0101] For example, see Figure 8 , Figure 8 is a fourth working flow diagram of the controller provided in an embodiment of the present invention. The controller 20 is further configured to execute steps S221 to S223. The calculation process of the refrigeration capacity qF satisfies the following formula:

[0102] qF=K3*A3*(T ra -T evap ) (4);

[0103] Wherein, K3 is the third heat transfer coefficient of the evaporator, which is related to the material, heat transfer area, type and refrigerator model of the evaporator and can be pre-stored when the refrigerator leaves the factory; A3 is the second heat transfer area of ​​the evaporator and can be pre-stored when the refrigerator leaves the factory; T ra is the return air correction temperature; T evap The evaporating temperature is detected by the evaporating temperature sensor.

[0104] Specifically, the return air correction temperature T ra According to the air supply volume q of the cold storage room mr , Freezer compartment air supply volume q mf , freezing temperature T f and refrigeration setting temperature T r Calculated; wherein, the refrigeration room air supply volume q mr , Freezer compartment air supply volume q mf According to the fan speed, these two values ​​are set when the refrigerator leaves the factory. When the fan speed is different, the corresponding refrigerator compartment air supply volume q mr , Freezer compartment air supply volume q mf Different. The return air correction temperature T ra The calculation process satisfies the following formula:

[0105] Tra =f(q mr , T r ,q mf , T f ) (5);

[0106] Wherein, formula (5) represents the return air correction temperature T ra It is related to these four parameters and can be obtained by looking up the table. For example, the laboratory can pre-measure the corresponding return air correction temperature T under different four parameter conditions. ra , thereby storing the test results in the memory 30.

[0107] In this embodiment of the present invention, the evaporator's own influencing factors and the evaporation temperature are used to calculate the refrigeration capacity, ensuring that the calculated results are consistent with actual refrigeration conditions, thereby improving the control logic's accuracy. Furthermore, the calculation process for refrigeration capacity is further refined and enhanced by using the refrigerator compartment air volume, freezer compartment air volume, freezing temperature, and refrigeration set point temperature.

[0108] Specifically, the calculation of the refrigeration heat exchange amount based on the start and stop point temperatures of the refrigeration chamber includes: obtaining air parameters and the refrigeration content volume of the refrigeration chamber; determining a fourth temperature difference based on the start and stop point temperatures; and calculating the product of the air parameters, the refrigeration content volume and the fourth temperature difference to obtain the refrigeration heat exchange amount.

[0109] For example, see Figure 9 , Figure 9 This is a fifth workflow diagram of the controller provided in an embodiment of the present invention. The controller 20 is further configured to execute steps S231 to S233. At this time, the air parameters include air density and air heat capacity. The calculation process of the refrigeration heat exchange capacity satisfies the following formula:

[0110] QR=ρ air *V*C air *Δt (6);

[0111] Among them, ρ air is the air density, which can be stored in advance online; V is the refrigerated storage volume of the refrigerator, which can be stored in advance when the refrigerator leaves the factory; C air is the heat capacity of air, which can be stored in advance online; Δt is the fourth temperature difference between the refrigeration start and stop points, that is, the degree to be reduced.

[0112] In this embodiment of the present invention, the refrigeration heat exchange rate is calculated using the refrigeration compartment's start / stop temperatures, the refrigerated compartment volume, and air parameters. This ensures that the calculated results are consistent with the actual refrigeration heat exchange rate, thereby improving the control logic's accuracy. Furthermore, the air parameters are characterized by air density and air heat capacity, further improving the calculation process and enhancing its reliability.

[0113] See also Figure 10 , Figure 10 This is a flowchart of a refrigerator refrigeration sensor fault protection method provided by an embodiment of the present invention. The refrigerator refrigeration sensor fault protection method is executed by a controller in the refrigerator and includes:

[0114] S1. When a refrigeration sensor failure is detected in the refrigerator, the heat load of the cabinet is calculated based on the ambient temperature and the freezing temperature, the refrigeration capacity is calculated based on the basic parameters of the evaporator and the evaporation temperature, and the heat exchange capacity is calculated based on the start and stop point temperatures of the refrigeration compartment;

[0115] S2. When the cabinet heat load, the refrigeration capacity, and the refrigeration heat exchange capacity satisfy a corresponding preset relationship, obtaining a control mode corresponding to the preset relationship;

[0116] S3. Control the operation of the refrigerator according to the control mode.

[0117] Specifically, the preset relationship includes a first relationship and a second relationship; wherein, the first relationship satisfies: within a first time period, the refrigeration cooling capacity is greater than or equal to the sum of the cabinet heat load and the refrigeration heat exchange capacity; the second relationship satisfies: within a second time period, the cabinet heat load is greater than or equal to the refrigeration heat exchange capacity.

[0118] Specifically, the method also includes: when the refrigeration sensor fails, controlling the compressor to start; when the cabinet heat load, the refrigeration cooling capacity and the refrigeration heat exchange rate satisfy the first relationship, controlling the compressor to stop; after the compressor stops, when the cabinet heat load and the refrigeration heat exchange rate satisfy the second relationship, controlling the compressor to start.

[0119] Specifically, the calculation of the cabinet heat load based on the ambient temperature and the freezing temperature includes: calculating a first temperature difference between the ambient temperature and the refrigeration setting temperature; calculating a second temperature difference between the freezing temperature and the refrigeration setting temperature; and calculating the cabinet heat load using the first temperature difference and the second temperature difference.

[0120] Specifically, the calculation of the cabinet heat load based on the first temperature difference and the second temperature difference includes: obtaining the outer surface area of ​​the refrigeration chamber in the cabinet and the first heat exchange area between the freezer chamber and the refrigeration chamber; calculating a first product between the outer surface area, the first heat exchange coefficient and the first temperature difference; calculating a second product between the first heat exchange area, the second heat exchange coefficient and the second temperature difference; and taking the sum of the first product and the second product as the cabinet heat load.

[0121] Specifically, the basic parameters of the evaporator include the third heat exchange coefficient and the second heat exchange area of ​​the evaporator; the calculation of the refrigeration capacity based on the basic parameters of the evaporator and the evaporation temperature includes: calculating the third temperature difference between the return air correction temperature and the evaporation temperature; calculating the product of the second heat exchange area, the third heat exchange coefficient and the third temperature difference to obtain the refrigeration capacity.

[0122] Specifically, the return air correction temperature is calculated based on the refrigeration compartment air supply volume, the freezer compartment air supply volume, the freezing temperature and the refrigeration set temperature.

[0123] Specifically, the calculation of the refrigeration heat exchange amount based on the start and stop point temperatures of the refrigeration chamber includes: obtaining air parameters and the refrigeration content volume of the refrigeration chamber; determining a fourth temperature difference based on the start and stop point temperatures; and calculating the product of the air parameters, the refrigeration content volume and the fourth temperature difference to obtain the refrigeration heat exchange amount.

[0124] Specifically, the air parameters include air density and air heat capacity.

[0125] It is worth noting that the specific working process of the refrigerator refrigeration sensor fault protection method described in the embodiment of the present invention can refer to the working process of the controller in the refrigerator described in the above embodiment, and will not be repeated here.

[0126] In an embodiment of the present invention, when a refrigeration sensor in a refrigerator fails, three parameters, namely, cabinet heat load, refrigeration cooling capacity, and refrigeration heat exchange capacity, are calculated based on the detected ambient temperature, freezing temperature, evaporation temperature, and refrigeration set temperature. When the cabinet heat load, refrigeration cooling capacity, and refrigeration heat exchange capacity satisfy the corresponding preset relationship, a control mode corresponding to the preset relationship is obtained. Thus, even when the refrigeration sensor fails, the compressor can be accurately controlled according to the control mode, thereby realizing control and protection of the indoor temperature of the refrigerated room, which not only ensures the basic refrigeration requirements of the refrigeration, but also ensures that the refrigeration temperature still has a certain temperature control accuracy.

[0127] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A refrigerator, characterized in that: include: a box body, wherein at least one storage compartment is formed in the box body, and the storage compartment includes at least a refrigeration compartment; A refrigeration system comprising a compressor, a condenser, and an evaporator connected in sequence through pipelines, wherein the refrigeration system is used to provide cooling for the refrigerator; An ambient temperature sensor is provided outside the refrigerator and is used to detect the ambient temperature of the environment in which the refrigerator is located; A refrigeration sensor is provided in the refrigeration chamber and is used to detect the real-time refrigeration temperature of the refrigeration chamber; A freezing temperature sensor is provided in the freezing chamber and is used to detect the freezing temperature of the freezing chamber; an evaporation temperature sensor, disposed in the evaporator, for detecting the evaporation temperature of the evaporator; The controller is configured as: When a refrigeration sensor failure is detected, the heat load of the cabinet is calculated according to the ambient temperature and the freezing temperature, the refrigeration capacity is calculated according to the basic parameters of the evaporator and the evaporation temperature, and the refrigeration heat exchange capacity is calculated according to the start and stop point temperatures of the refrigeration chamber; When the cabinet heat load, the refrigeration capacity, and the refrigeration heat exchange capacity satisfy a corresponding preset relationship, obtaining a control mode corresponding to the preset relationship; The refrigerator is controlled to operate according to the control mode.

2. The refrigerator according to claim 1, wherein The preset relationship includes a first relationship and a second relationship; wherein the first relationship satisfies: In the first time period, the refrigeration capacity is greater than or equal to the sum of the cabinet heat load and the refrigeration heat exchange capacity; The second relational expression satisfies: During the second time period, the cabinet heat load is greater than or equal to the refrigeration heat exchange capacity.

3. The refrigerator according to claim 2, wherein: The controller is configured to: When the refrigeration sensor fails, controlling the compressor to start; When the cabinet heat load, the refrigeration capacity, and the refrigeration heat exchange capacity satisfy the first relationship, controlling the compressor to stop; After the compressor is stopped, when the cabinet heat load and the refrigeration heat exchange capacity satisfy the second relationship, the compressor is controlled to start up.

4. The refrigerator according to claim 1, wherein The calculating of the cabinet heat load according to the ambient temperature and the freezing temperature includes: calculating a first temperature difference between the ambient temperature and the refrigeration set temperature; calculating a second temperature difference between the freezing temperature and the refrigeration setting temperature; The heat load of the cabinet is calculated using the first temperature difference and the second temperature difference.

5. The refrigerator according to claim 4, wherein: The calculating the heat load of the cabinet according to the first temperature difference and the second temperature difference includes: Obtaining an outer surface area of ​​the refrigerating chamber in the box and a first heat exchange area between the freezing chamber and the refrigerating chamber; calculating a first product of the outer surface area, a first heat transfer coefficient, and the first temperature difference; calculating a second product of the first heat exchange area, the second heat exchange coefficient, and the second temperature difference; The sum of the first product and the second product is taken as the heat load of the box.

6. The refrigerator according to claim 1, wherein The basic parameters of the evaporator include the third heat exchange coefficient and the second heat exchange area of ​​the evaporator; and calculating the refrigeration capacity according to the basic parameters of the evaporator and the evaporation temperature includes: calculating a third temperature difference between the return air corrected temperature and the evaporation temperature; The product of the second heat exchange area, the third heat exchange coefficient and the third temperature difference is calculated to obtain the refrigeration capacity.

7. The refrigerator according to claim 6, wherein The return air correction temperature is calculated based on the refrigeration compartment air supply volume, the freezer compartment air supply volume, the freezing temperature and the refrigeration set temperature.

8. The refrigerator according to claim 1, wherein The calculation of the refrigeration heat exchange amount according to the start and stop point temperatures of the refrigeration chamber includes: Acquiring air parameters and the refrigerated storage volume of the refrigerated chamber; Determining a fourth temperature difference according to the start and stop point temperatures; The product of the air parameter, the refrigerated internal volume and the fourth temperature difference is calculated to obtain the refrigerated heat exchange capacity.

9. The refrigerator according to claim 8, wherein The air parameters include air density and air heat capacity.

10. A refrigerator refrigeration sensor fault protection method, characterized in that: include: When a refrigeration sensor failure is detected in the refrigerator, the heat load of the cabinet is calculated based on the ambient temperature and the freezing temperature, the refrigeration capacity is calculated based on the basic parameters of the evaporator and the evaporation temperature, and the refrigeration heat exchange capacity is calculated based on the start and stop point temperatures of the refrigeration compartment; When the cabinet heat load, the refrigeration capacity, and the refrigeration heat exchange capacity satisfy a corresponding preset relationship, obtaining a control mode corresponding to the preset relationship; The refrigerator is controlled to operate according to the control mode.

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