Refrigerator and refrigeration sensor fault protection method thereof

Abstract

The invention discloses a refrigerator and a refrigeration sensor fault protection method thereof, and the method comprises the steps: when a refrigeration sensor in the refrigerator breaks down, based on the detected environment temperature, freezing temperature, evaporation temperature and refrigeration set temperature, calculating to obtain three parameters of box body heat load, refrigeration refrigerating capacity and refrigeration heat exchange capacity; and when the box body heat load, the refrigeration refrigerating capacity and the refrigeration heat exchange capacity meet the corresponding preset relational expression, the control mode corresponding to the preset relational expression is obtained, so that accurate operation of the compressor can be controlled according to the control mode when the refrigeration sensor breaks down, control and protection of the temperature in the refrigeration chamber are achieved, and the service life of the refrigeration chamber is prolonged. Not only is the basic refrigeration requirement of refrigeration ensured, but also the refrigeration temperature still has certain temperature control precision.

Description

Technical Field

[0001] The 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 the use of the refrigerator, the compressor will continuously run and shut down. Each time the compressor runs and shuts down is called a refrigeration cycle. In a refrigerator using a refrigeration sensor, the refrigeration sensor monitors the temperature in the refrigerator and decides whether to start or stop the refrigeration. In actual use, the refrigerator may sometimes experience a refrigeration sensor failure. When the refrigeration sensor fails, the refrigerator cannot perform normal refrigeration control due to the lack of accurate temperature feedback. For refrigeration sensor failure, the most commonly used control method for refrigerators is to maintain the temperature in the refrigerator by setting a fixed start and stop time. However, this control method cannot effectively feedback the set temperature, making the refrigerator refrigeration gear adjustment invalid. At the same time, when the same start and stop time is used under different ambient temperatures, the actual temperature inside the box varies greatly, which may cause the temperature inside the box to be too high or cross zero, affecting the normal preservation of food. Summary of the invention

[0003] The purpose of the embodiment 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 demand 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, in which at least one storage chamber is formed, and the storage chamber includes at least a refrigerating chamber;

[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 disposed outside the box and is used to detect the ambient temperature of the environment in which the refrigerator is located;

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

[0009] A freezing temperature sensor is disposed in the freezing chamber and is used to detect 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 the refrigeration sensor is detected to have failed, 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 box 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 scheme 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 satisfy 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, which not only guarantees the basic refrigeration requirements of the refrigeration, but also ensures 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 relational expression satisfies that: within the second time period, the cabinet heat load 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 box 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 amount satisfy the second relationship, the compressor is controlled to start.

[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 setting 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 box heat load according to the first temperature difference and the second temperature difference includes:

[0030] Obtaining the outer surface area of ​​the refrigerating chamber in the box and the 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 box heat load.

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

[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 according to the basic parameters of the evaporator and the evaporation temperature includes:

[0036] calculating a third temperature difference between the return air correction 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 conforms to 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 chamber air supply volume, the freezer chamber 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 chamber air supply volume, the freezer chamber 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, the calculation of the refrigeration heat exchange amount 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-stop point temperature;

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

[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 temperature of the refrigeration room, the refrigeration content 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 object, 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 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 room;

[0050] When the box 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 scheme 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 satisfy 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, which not only guarantees the basic refrigeration requirements of the refrigeration, but also ensures that the refrigeration temperature still has a certain temperature control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

[0061] Fig. 9 is a fifth working flow chart of the controller provided by an embodiment of the present invention;

[0062] Fig.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; 112, freezer; 101, compressor; 102, evaporator; 103, capillary; 104, condenser. DETAILED DESCRIPTION

[0064] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

[0066] The terms "first", "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the 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 clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0068] See also Figure 1 , Figure 1It is a schematic diagram of the external structure of a refrigerator 100 provided by an embodiment of the present invention. The refrigerator 100 of this embodiment is approximately rectangular in shape. The refrigerator includes a box body that defines a storage space and one or more door bodies arranged at the opening of the box body, wherein the door body includes a door body shell located outside the box body, a door body liner located inside the box body, an upper end cover, a lower end cover, and an insulation layer located between the door body shell, the door body liner, the upper end cover, and the lower end cover; usually, the insulation layer is filled with foam. The box body is provided with a chamber, wherein the chamber includes a component storage chamber for placing components in the refrigerator, such as a press cabin, etc., and also includes a storage space for storing food, etc.

[0069] See also Figure 2 , Figure 2 1 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 refrigerating room 111 and a freezing 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 door bodies, for example, Figure 2 The storage room at the upper part is provided with a double-opening 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 schematic diagram of the structure of the refrigeration system in the refrigerator 100 provided in the embodiment of the present invention, 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. Among them, the compression process is: plug in the power cord of the refrigerator, when the contacts of the thermostat are connected, the compressor 101 starts to work, and the low-temperature and low-pressure refrigerant is sucked into the compressor 101, and is compressed into a high-temperature and high-pressure superheated gas in the cylinder of the compressor 101 and then discharged into the condenser 104; the condensation process is: the high-temperature and high-pressure refrigerant gas dissipates heat through the condenser 104, 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 process is as follows ... The process is as follows: the condensed refrigerant saturated liquid is filtered through a drying filter to remove moisture and impurities and then flows into the capillary 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, and the above process is repeated 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 comprises:

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

[0073] The controller 20 is disposed in the box, 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 the operating parameters of the refrigerator, such as the operating parameters including: 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 speed of the fan 50, the speed of the compressor 101, the defrosting time, etc.;

[0075] The air door 40 includes a refrigerating air door 401 and a freezing air door 402. The refrigerating air door 401 is arranged in an air duct connected to the refrigerating chamber 111. When the refrigerating air door 401 is opened, the cold air in the air duct can smoothly enter the refrigerating chamber 111. When the refrigerating air door 401 is closed, the cold air in the air duct cannot enter the refrigerating chamber 111. The freezing air door 402 is arranged in an air duct connected to the freezing chamber 112. When the freezing air door 402 is opened, the cold air in the air duct can smoothly enter the freezing chamber 112. When the freezing air door 402 is closed, the cold air in the air duct cannot enter the freezing chamber 112.

[0076] The fan 50 is disposed 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 is provided in the refrigeration chamber 111 and is used to detect 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 box and is used to detect the ambient temperature of the environment in which the refrigerator is located. After sending the 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 is disposed in the evaporator 102 and is used to detect the evaporation temperature of the evaporator 102;

[0081] Furthermore, the refrigerator may also include a defrost heater (or not), which is arranged on one side of the evaporator. After the compressor works for a period of time (about 8-10 hours), frost will also form on the surface of the fin evaporator. If defrosting is not performed, the frost will become thicker and thicker, and then the fin evaporator will be filled with frost and the air duct will be blocked, so that the cold air cannot circulate and the refrigeration effect is reduced. The defrost timer works for 8-10 hours, automatically cuts off the power supply of the compressor, and connects the electric heating tube in the defrost heater 60. The heating tube heats and melts the frost connected to the fin evaporator. After defrosting is completed, the defrost timer cuts off the power supply of the electric heating tube, connects the power supply of the compressor to resume refrigeration, and the cycle repeats itself.

[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 room; 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 It is the first working flow chart of the controller provided by an embodiment of the present invention, and the controller 20 is configured to execute steps S11 to S16. After the refrigerator is turned on and operated, the operating parameters in the refrigerator are first obtained, and 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 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 room, and 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. Thus, 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 indoor temperature of the refrigerated room, which not only guarantees the basic refrigeration demand of the refrigerated room, but also ensures that the refrigerated temperature still has a certain temperature control accuracy.

[0085] Specifically, the preset relational expression includes a first relational expression and a second relational expression; wherein the first relational expression 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 relational expression satisfies the following formula:

[0086]

[0087] Among them, 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 relational expression meets the following conditions: in the second time period, the box heat load is greater than or equal to the refrigeration heat exchange amount, and the second relational expression satisfies the following formula:

[0089]

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

[0091] For example, see Figure 6 , Figure 6 This is the second working flow chart of the controller provided by the embodiment of the present invention. When the refrigeration sensor fails, the controller 20 is also used to execute step S121: control 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. At this time, the first time period is the time period from the compressor starting 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. At this time, 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 mentioning 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 realized.

[0093] In the embodiment of the present invention, by constructing the first relational expression and the second relational expression, and taking the first relational expression and the second relational expression as the basis for position determination, a certain degree of self-correction of the temperature inside the refrigerating room is achieved when the actual temperature inside the refrigerating 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 is the third working flow chart of the controller provided by an embodiment of the present invention, and the controller 20 is further configured to execute steps S211 to S213, at which time the calculation of the cabinet heat load according to the first temperature difference and the second temperature difference includes: obtaining the outer surface area of ​​the refrigerator compartment in the cabinet and the first heat exchange area between the freezer compartment and the refrigerator compartment; calculating the first product between the outer surface area, the first heat exchange coefficient and the first temperature difference; calculating the 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. 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] Wherein, K1 is the first heat exchange coefficient between the environment and the refrigerator compartment, which is related to the material and thickness of the refrigerator and can be pre-stored before the refrigerator leaves the factory; A1 is the outer surface area of ​​the middle refrigerator compartment; T e is the ambient temperature detected by the ambient temperature sensor; T r is the refrigeration set temperature; K2 is the second heat exchange 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 This is the freezing temperature 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 fact, QR must be greater than the actual heat exchange, that is, the actual cooling temperature difference is less than the set refrigeration cooling temperature difference. In this way, the actual cooling temperature difference decreases, 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 being stable; conversely, 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 drop and approach the set temperature.

[0099] In the embodiment of the present invention, since different relational expressions correspond to different refrigerator control logics, the control logic complement when the refrigeration sensor fails is improved, and the appropriate control logic can be quickly switched to according to these relational expressions, and the refrigeration temperature can still be controlled under certain conditions after the refrigeration sensor fails. In addition, 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.

[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 chart of the controller provided in an embodiment of the present invention, wherein the controller 20 is further configured to execute steps S221 to S223, and 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 exchange coefficient of the evaporator, which is related to the material, heat exchange area, type and refrigerator model of the evaporator and can be pre-stored when the refrigerator leaves the factory; A3 is the second heat exchange 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 It is the evaporating temperature detected by the evaporating temperature sensor.

[0104] Specifically, the return air correction temperature T ra According to the air supply volume of the cold storage room q mr , Freezer air volume q mf , freezing temperature T f and refrigeration setting temperature T r Calculated; wherein, the refrigeration room air supply volume q mr , Freezer air 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 air volume q mf 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 the specific information can be obtained by looking up the table. For example, the laboratory pre-measures the corresponding return air correction temperature T under different four parameter conditions. ra , thereby storing the test results in the memory 30.

[0107] In the embodiment of the present invention, the evaporator's own influencing factors and the evaporation temperature are used to calculate the refrigeration capacity, so that the calculation result conforms to the actual refrigeration situation, thereby improving the control accuracy of the control logic. In addition, the refrigeration room air supply volume, the freezer room air supply volume, the freezing temperature and the refrigeration setting temperature are used to further improve the calculation process of the refrigeration capacity, thereby improving the reliability of the calculation process of the refrigeration capacity.

[0108] Specifically, the calculation of the refrigeration heat exchange amount according to 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 according to 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 Fig. 9 , Fig. 9 is a fifth working flow chart of the controller provided in an embodiment of the present invention, wherein the controller 20 is further configured to execute steps S231 to S233, wherein 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 online in advance; 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 the embodiment of the present invention, the refrigeration heat exchange capacity is calculated by using the start and stop point temperature of the refrigeration room, the refrigeration internal volume and the air parameters, so that the calculation result conforms to the actual refrigeration heat exchange capacity, thereby improving the control accuracy of the control logic. In addition, 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.

[0113] See also Fig.10 , Fig.10 This is a flow chart of a refrigerator refrigeration sensor fault protection method provided by an embodiment of the present invention. The refrigerator refrigeration sensor fault protection method is implemented by a controller in the refrigerator. The refrigerator refrigeration sensor fault protection method includes:

[0114] S1. When a refrigeration sensor failure is detected in the refrigerator, 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 temperature of the refrigeration room;

[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. Controlling 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 is stopped, 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 refrigerating chamber in the cabinet and the first heat exchange area between the freezing chamber and the refrigerating 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 refrigerating chamber air supply volume, the freezing chamber air supply volume, the freezing temperature and the refrigerating set temperature.

[0123] Specifically, the calculation of the refrigeration heat exchange amount according to 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 according to 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, which 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, 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 indoor temperature of the refrigerated room, which not only guarantees the basic refrigeration demand of the refrigerated room, but also ensures that the refrigerated 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 a person skilled in the art can make several improvements and modifications without departing from the principle 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, in which at least one storage chamber is formed, and the storage chamber includes at least a refrigerating chamber; 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 disposed outside the box and is used to detect the ambient temperature of the environment in which the refrigerator is located; A refrigeration sensor is arranged in the refrigeration chamber and is used to detect the real-time refrigeration temperature of the refrigeration chamber; A freezing temperature sensor is disposed 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 the refrigeration sensor is detected to have failed, 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 box 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, characterized in that: The preset relational expression includes a first relational expression and a second relational expression; wherein the first relational expression 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 relation conforms to: In 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, characterized in that: The controller is configured to: When the refrigeration sensor fails, controlling the compressor to start; When the box 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 amount satisfy the second relationship, the compressor is controlled to start.

4. The refrigerator according to claim 1, characterized in that: The calculating of the cabinet heat load according to the ambient temperature and the freezing temperature comprises: 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; 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, characterized in that: The calculating the box heat load according to the first temperature difference and the second temperature difference includes: Obtaining the outer surface area of ​​the refrigerating chamber in the box and the 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 box heat load.

6. The refrigerator according to claim 1, characterized in that: The basic parameters of the evaporator include the third heat exchange coefficient and the second heat exchange area of ​​the evaporator; and the calculation of 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 correction 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, characterized in that: The return air correction temperature is calculated based on the refrigerating chamber air supply volume, the freezing chamber air supply volume, the freezing temperature and the refrigerating set temperature.

8. The refrigerator according to claim 1, characterized in that: The step of calculating 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-stop point temperature; The product of the air parameter, the refrigerated internal volume and the fourth temperature difference is calculated to obtain the refrigerated heat exchange amount.

9. The refrigerator according to claim 8, characterized in that: 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 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 room; When the box 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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