Refrigerator and compressor control method thereof

Abstract

According to the refrigerator and the compressor control method thereof, a software algorithm is adopted, the target operation frequency needed by a compressor is calculated according to different preset scenes, under the condition that a bottom air cooler breaks down and cannot work normally, the refrigeration requirement of a system is met, and the over-temperature phenomenon of a press bin is prevented; and the use safety of the user is prevented from being endangered.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerators, and in particular to a refrigerator and a compressor control method thereof. Background Art

[0002] The built-in refrigerator or freezer is built into the cabinet or placed in a relatively closed environment. During the refrigeration process, the compressor converts the low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas, and the system's matching condenser releases a lot of heat, so the compressor compartment is prone to overheating. When the refrigerator compressor is working, there is a maximum temperature limit for its shell, which usually cannot exceed 95°C. The closed working environment of the compressor compartment makes it easy to overheat, so the bottom cooling fan will be used in the design to enhance the heat dissipation capacity. In the event of a certain fault (such as structural interference, stalling, or failure of the drive circuit, etc.), the bottom cooling fan cannot work normally, and the system compressor will face severe high temperature environment. Once the duration is too long, the compressor and its compressor compartment will experience component failure, abnormal refrigeration, deformation of the compressor compartment, and even flammability, affecting user safety. Summary of the invention

[0003] The purpose of the embodiment of the present invention is to provide a refrigerator and a compressor control method thereof, which can calculate the target operating frequency required by the compressor according to different preset scenarios by adopting a software algorithm, and ensure the refrigeration demand of the system and prevent the compressor compartment from overheating when the bottom cooling fan fails to work normally, thereby avoiding endangering the user's safety.

[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 and a freezing chamber;

[0006] A door, used for opening and closing the storage room;

[0007] A compressor compartment is arranged in the box body, and a compressor, a condenser and a bottom cooling fan are arranged inside the compressor compartment, and the bottom cooling fan is used to dissipate heat for the compressor and the condenser;

[0008] A compartment temperature sensor is provided in the storage compartment and is used to detect the actual refrigeration temperature of the storage compartment;

[0009] An ambient temperature sensor is arranged outside the box body and is used to detect the ambient temperature of the environment in which the refrigerator is located;

[0010] The controller is configured as:

[0011] When it is detected that the bottom cooling fan has a shutdown failure, obtaining the actual cooling temperature detected by the compartment temperature sensor, and obtaining the ambient temperature detected by the ambient temperature sensor;

[0012] Calculating the temperature difference between the actual refrigeration temperature and the preset target refrigeration temperature;

[0013] Obtaining the recorded continuous operation time of the compressor and the shutdown time of the bottom cooling fan;

[0014] Calculating a target operating frequency of the compressor according to the continuous operation time, the shutdown time, the temperature difference and the ambient temperature;

[0015] The compressor is controlled to operate according to the target operating frequency.

[0016] As an improvement of the above solution, the target operating frequency of the compressor is calculated according to the continuous operation time, the shutdown time, the temperature difference and the ambient temperature, including:

[0017] Acquire a corresponding continuous operation duration coefficient according to the continuous operation duration, and acquire a corresponding downtime duration coefficient according to the downtime duration;

[0018] The target operating frequency of the compressor is calculated according to the continuous operation duration coefficient, the shutdown duration coefficient, the temperature difference and the ambient temperature.

[0019] As an improvement of the above solution, the controller is further configured as follows:

[0020] When recording the continuous operation time of the compressor, if the temperature difference exceeds a preset temperature difference threshold and the continuous operation time exceeds a preset continuous operation time threshold, a compressor failure is reported and the compressor is controlled to shut down.

[0021] As an improvement of the above solution, the controller is further configured as follows:

[0022] When recording the downtime of the bottom cooling fan, if the downtime exceeds a preset downtime threshold, a shutdown failure of the bottom cooling fan is reported.

[0023] As an improvement of the above solution, after obtaining the target operating frequency of the compressor, the controller is further configured as follows:

[0024] When the target operating frequency is greater than a preset upper limit value of the operating frequency range, modifying the target operating frequency to the upper limit value of the operating frequency range;

[0025] When the target operating frequency is less than a preset lower limit value of the operating frequency range, the target operating frequency is modified to the lower limit value of the operating frequency range.

[0026] As an improvement of the above solution, the target operating frequency of the compressor is calculated according to the continuous operation time coefficient, the shutdown time coefficient, the temperature difference and the ambient temperature, including:

[0027] Obtain duration coefficient weight, temperature difference weight and ambient temperature weight;

[0028] Calculate the duration proportion according to the continuous operation duration coefficient, the shutdown duration coefficient and the duration coefficient weight, calculate the temperature difference proportion according to the temperature difference and the temperature difference weight, and calculate the ambient temperature proportion according to the ambient temperature and the ambient temperature weight;

[0029] The duration ratio, the temperature difference ratio and the ambient temperature ratio are accumulated to obtain the target operating frequency of the compressor.

[0030] To achieve the above object, an embodiment of the present invention further provides a refrigerator compressor control method, comprising:

[0031] When the bottom cooling fan is detected to have a shutdown failure, the actual refrigeration temperature of the refrigerator storage room and the ambient temperature of the environment in which the refrigerator is located are obtained;

[0032] Calculating the temperature difference between the actual refrigeration temperature and the preset target refrigeration temperature;

[0033] Obtaining the recorded continuous operation time of the compressor and the shutdown time of the bottom cooling fan;

[0034] Calculating a target operating frequency of the compressor according to the continuous operation time, the shutdown time, the temperature difference and the ambient temperature;

[0035] The compressor is controlled to operate according to the target operating frequency.

[0036] As an improvement of the above solution, the target operating frequency of the compressor is calculated according to the continuous operation time, the shutdown time, the temperature difference and the ambient temperature, including:

[0037] Acquire a corresponding continuous operation duration coefficient according to the continuous operation duration, and acquire a corresponding downtime duration coefficient according to the downtime duration;

[0038] The target operating frequency of the compressor is calculated according to the continuous operation duration coefficient, the shutdown duration coefficient, the temperature difference and the ambient temperature.

[0039] As an improvement of the above solution, the method further includes:

[0040] When recording the continuous operation time of the compressor, if the temperature difference exceeds a preset temperature difference threshold and the continuous operation time exceeds a preset continuous operation time threshold, a compressor failure is reported and the compressor is controlled to shut down.

[0041] As an improvement of the above solution, the method further includes:

[0042] When recording the downtime of the bottom cooling fan, if the downtime exceeds a preset downtime threshold, a shutdown failure of the bottom cooling fan is reported.

[0043] Compared with the prior art, the present invention discloses a refrigerator and a compressor control method thereof, which calculates the target operating frequency required by the compressor according to different preset scenarios by adopting a software algorithm. When the bottom cooling fan fails to work normally, the system's refrigeration needs are guaranteed and over-temperature of the compressor compartment is prevented, thereby avoiding endangering the user's safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a schematic diagram of the external structure of a refrigerator provided by an embodiment of the present invention;

[0045] Figure 2 is a schematic diagram of the internal structure of a refrigerator provided by an embodiment of the present invention;

[0046] Figure 3 is another schematic diagram of the internal structure of a refrigerator provided by an embodiment of the present invention;

[0047] Figure 4 is a schematic structural diagram of a refrigeration system in a refrigerator provided by an embodiment of the present invention;

[0048] Figure 5 is a schematic diagram of the connection between the controller and other hardware devices provided by an embodiment of the present invention;

[0049] Figure 6 is a first working flow diagram of a controller provided by an embodiment of the present invention;

[0050] Figure 7 is a second working flow diagram of the controller provided by an embodiment of the present invention;

[0051] Figure 8 is a third working flow diagram of the controller provided in an embodiment of the present invention;

[0052] Fig. 9 is a fourth working flow diagram of the controller provided by an embodiment of the present invention;

[0053] Fig.10 is a fifth working flow chart of the controller provided by an embodiment of the present invention;

[0054] Fig.11 is a sixth working flow diagram of the controller provided by an embodiment of the present invention;

[0055] Fig.12 The present invention is a flowchart of a refrigerator compressor control method provided by an embodiment of the present invention.

[0056] Among them, 100, refrigerator; 1, compressor; 2, evaporator; 3, capillary; 4, condenser; 11, freezer; 12, refrigerator; 111, freezing temperature sensor; 112, refrigerator temperature sensor; 113, ambient temperature sensor; 121, refrigerator temperature adjustment potentiometer. DETAILED DESCRIPTION

[0057] 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.

[0058] 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.

[0059] 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. Therefore, 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.

[0060] 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.

[0061] See also Figure 1 , Figure 1 It is a schematic diagram of the external structure of a refrigerator 100 provided in an embodiment of the present invention. The refrigerator described in the embodiment of the present invention is an air-cooled refrigerator. The refrigerator 100 described in the embodiment of the present invention is approximately rectangular in shape. The refrigerator includes a box body that defines a storage space and a plurality of door bodies arranged at the opening of the box body, wherein the door body includes a door body shell located on the outside of the box body, a door body liner located on the inside of 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 material. 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 chamber, etc., and also includes a storage space for storing food, etc. The door of the refrigerator is provided with a display screen, and the display screen is used to display prompt information and receive user touch operations.

[0062] 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 freezer 11 and a refrigerator 12 according to different uses. They can also include a variable temperature room, a vacuum drawer, a moisturizing drawer, etc. In the refrigerator 100 shown in the embodiment of the present invention, the freezer 11 is located above the refrigerator 12. In other embodiments, the freezer 11 can also be located below the refrigerator 12. Each storage room corresponds to one or more door bodies, for example, Figure 2 In the freezer compartment 11 at the top, a double-door body is provided. 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.

[0063] See also Figure 3 , Figure 3 1 is another schematic diagram of the internal structure of a refrigerator provided by an embodiment of the present invention, wherein a freezing temperature sensor 111 is provided inside the freezing chamber 11, and the freezing temperature sensor is used to obtain the actual freezing and refrigeration temperature of the freezing chamber 11, and a refrigeration temperature sensor 112 is provided inside the refrigeration chamber 12, and the refrigeration temperature sensor is used to obtain the actual refrigeration and refrigeration temperature of the refrigeration chamber 12. The refrigeration chamber 12 is also provided with a refrigeration temperature adjustment potentiometer 121, and the refrigeration temperature adjustment potentiometer 121 is used to adjust the temperature level of the refrigeration chamber 12. Furthermore, an ambient temperature sensor 113 is also provided outside the box body of the refrigerator 100, and the ambient temperature sensor 113 is used to detect the ambient temperature of the environment in which the refrigerator is located.

[0064] See also Figure 4 , Figure 4The schematic diagram of the structure of the refrigeration system in the refrigerator provided by the embodiment of the present invention, the refrigeration system includes a compressor 1, an evaporator 2, a drying filter (not shown in the figure), a capillary tube 3, a condenser 4 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: plug in the power cord of the refrigerator, when the contacts of the thermostat are connected, the compressor 1 starts to work, and the low-temperature and low-pressure refrigerant is sucked into the compressor 1, and is compressed into a high-temperature and high-pressure superheated gas in the cylinder of the compressor 1 and then discharged into the condenser 4; the condensation process is: the high-temperature and high-pressure refrigerant gas dissipates heat through the condenser 4, 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 3, 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 2, which not only reduces the temperature of the evaporator 2 and its surroundings, but also turns the refrigerant into a low-temperature, low-pressure gas. The refrigerant coming out of the evaporator 2 passes through the gas-liquid separator and returns to the compressor 1 again, repeating the above process to transfer the heat in the refrigerator to the air outside the box, thereby achieving the purpose of refrigeration.

[0065] See also Figure 5 , Figure 5 : is a connection diagram of the controller provided by an embodiment of the present invention and other hardware devices, wherein the actual refrigeration temperature detected by the compartment temperature sensor and the ambient temperature detected by the ambient temperature sensor are obtained through the controller in the refrigerator; the compartment temperature sensor includes a refrigeration temperature sensor for obtaining the actual refrigeration temperature and a freezing temperature sensor for obtaining the actual freezing temperature; then, when the target storage chamber is a refrigeration chamber, the actual refrigeration temperature is the actual refrigeration temperature, and the target refrigeration temperature is the target refrigeration temperature; when the target storage chamber is a freezing chamber, the actual refrigeration temperature is the actual freezing temperature, and the target refrigeration temperature is the target freezing temperature.

[0066] Specifically, the controller is configured to: when a shutdown failure of the bottom cooling fan is detected, obtain the actual cooling temperature detected by the compartment temperature sensor and the ambient temperature detected by the ambient temperature sensor; calculate the temperature difference between the actual cooling temperature and the preset target cooling temperature; obtain the recorded continuous operation time of the compressor and the shutdown time of the bottom cooling fan; calculate the target operating frequency of the compressor based on the continuous operation time, the shutdown time, the temperature difference and the ambient temperature; and control the compressor to operate according to the target operating frequency.

[0067] For example, see Figure 6 , Figure 6It is the first working flow chart of the controller provided in the embodiment of the present invention, and the controller is configured to execute steps S101 to S107. During the operation of the refrigerator, due to poor line contact, structural interference blocking or drive circuit failure, the bottom cooling fan may fail to work normally, resulting in a short-term fault shutdown (such as poor line contact) or a long-term fault shutdown (structural interference blocking or drive circuit failure). The compressor compartment has a maximum temperature limit for the shell, which usually cannot exceed 95°C. Due to the failure of the bottom cooling fan to shut down, the compressor cannot be cooled, and the compressor faces a closed high-temperature environment. Once the duration is too long, compressor component failure, refrigeration abnormality or compressor compartment deformation may occur. When it is detected that the bottom cooling fan fails and stops, the actual cooling temperature detected by the compartment temperature sensor is obtained, and the ambient temperature detected by the ambient temperature sensor is obtained; according to the target cooling temperature preset by the user, the temperature difference between the actual cooling temperature and the target cooling temperature is calculated, and this temperature difference can reflect the required speed of the compressor. If the actual cooling temperature is greater than the target cooling temperature and the temperature difference is large, the corresponding compressor speed must be relatively high to ensure the normal cooling demand of the compartment; after calculating the temperature difference, the continuous operation time of the compressor and the shutdown time of the bottom cooling fan are obtained. When the continuous operation time of the compressor in this refrigeration cycle (the refrigeration cycle includes the refrigeration stage and the defrosting stage) is too long, the compressor temperature becomes high and affects other components in the compressor compartment. The bottom cooling fan cannot dissipate heat for the compressor when it stops. When the shutdown time is too long, the operating frequency of the compressor needs to be appropriately reduced to prevent the compressor temperature from being too high; in addition, the compressor operating frequency is also related to the ambient temperature. Different ambient temperature ranges correspond to different compressor speeds. When the ambient temperature is higher, the heat load of the refrigerator is greater, the required cooling capacity is greater, and the corresponding compressor speed requirement is also higher. Therefore, in the embodiment of the present invention, the target operating frequency of the compressor is calculated according to the continuous operation time, the shutdown time, the temperature difference and the ambient temperature, so that the calculated target operating frequency can meet the refrigeration demand of the compartment; the target operating frequency can ensure that the compressor compartment is always kept within a suitable temperature range under different ambient temperatures, and finally the controller controls the compressor to operate according to the target operating frequency.

[0068] Specifically, the target operating frequency of the compressor is calculated based on the continuous operating time, the downtime time, the temperature difference and the ambient temperature, including: obtaining a corresponding continuous operating time coefficient based on the continuous operating time, and obtaining a corresponding downtime time coefficient based on the downtime time; and calculating the target operating frequency of the compressor based on the continuous operating time coefficient, the downtime time coefficient, the temperature difference and the ambient temperature.

[0069] For example, see Figure 7 , Figure 7 is a second working flow chart of the controller provided in an embodiment of the present invention, wherein the controller is configured to execute steps S201 to S202. In the first embodiment, the target operating frequency of the compressor can be directly calculated using a specific algorithm based on the continuous operation time, the shutdown time, the temperature difference and the ambient temperature, and the above step S106 can be referred to.

[0070] In the second embodiment, in order to save calculation time and normalize the collected data to prevent the compressor from frequently changing the speed with each parameter change, the continuous operation time and the downtime time can be converted into corresponding coefficients for calculation. The memory of the controller pre-stores the corresponding relationship between the continuous operation time (range value) and the continuous operation time coefficient, the downtime time (range value) and the downtime time coefficient, which can be stored in a data table. When calculating the target operating frequency of the compressor, the corresponding coefficient is obtained by looking up the table method. The conversion method can refer to Table 1. When executing steps S101 to S107, when the compressor stops (enters defrosting, and the compressor runs in the next refrigeration cycle), the continuous operation time of the compressor is cleared, and the corresponding continuous operation time coefficient is found in Table 1 according to the continuous operation time after clearing; when the bottom cooling fan resumes operation, the downtime of the bottom cooling fan is cleared, and steps S101 to S107 are continued when it is detected that the bottom cooling fan is stopped again. When matching different refrigeration systems, users can adjust the coefficients accordingly according to their own needs; based on the continuous operation time coefficient, the downtime time coefficient, the temperature difference and the ambient temperature, a specific algorithm is used to calculate the target operating frequency of the compressor.

[0071] Table 1 Correspondence between duration and coefficient

[0072] Continuous operation time Continuous operation time factor Downtime Downtime factor 0-30mins 5 1h-2h 1 30-90mins 3 2h-6h 0.8 90-270mins 2 6h-24h 0.3 More than 270 minutes 1 More than 24 hours 0

[0073] For example, as shown in Table 1, when the continuous operation time of the compressor is 10, the corresponding continuous operation time coefficient is 5, and when the continuous operation time of the compressor is 50 minutes, the corresponding continuous operation time coefficient is 3; when the shutdown time of the bottom cooling fan is 3 hours, the corresponding shutdown time coefficient is 0.8. It is worth noting that the data in Table 1 are only examples and can be adjusted according to actual refrigerator products, and are not specifically limited here.

[0074] Specifically, the controller is also configured to: when recording the continuous operation time of the compressor, if the temperature difference exceeds a preset temperature difference threshold and the continuous operation time exceeds a preset continuous operation time threshold, report that the compressor has failed and control the compressor to shut down.

[0075] For example, see Figure 8 , Figure 8 It is the third work flow chart of the controller provided by the embodiment of the present invention, and the controller is configured to execute steps S301 to S303. When recording the continuous operation time of the compressor, if the temperature difference exceeds the preset temperature difference threshold, and the continuous operation time of the compressor exceeds the preset continuous operation time threshold, it indicates that when the compressor is running for a long time, the actual refrigeration temperature of the refrigerator is still far higher than the target refrigeration temperature. If the compressor operates normally without failure, the compartment temperature will decrease, thus approaching the target refrigeration temperature. Therefore, it is determined that the compressor has failed at this time, and the compressor failure is reported. The controller controls the compressor to stop. The fault reporting method is to display it on the refrigerator display screen, send a text message to the user remotely, or send a reminder message on the user's mobile phone APP. Other methods can also be used, which are not specifically limited here.

[0076] Specifically, the controller is further configured to: when recording the shutdown duration of the bottom cooling fan, if the shutdown duration exceeds a preset shutdown duration threshold, report that a shutdown failure of the bottom cooling fan occurs.

[0077] For example, see Fig. 9 , Fig. 9 It is the fourth working flow chart of the controller provided in an embodiment of the present invention, and the controller is configured to execute steps S401 to S402. When recording the downtime of the bottom cooling fan, if the downtime exceeds the preset downtime threshold, the bottom cooling fan is reported to have a shutdown fault. If the fault time is short, the shutdown may be caused by poor line contact. At this time, the fault is not urgent and does not need to be reported. On the contrary, if the fault time is long, it is necessary to report a shutdown fault of the bottom cooling fan. The fault reporting method is to display it on the display screen of the refrigerator, send a text message to the user remotely, or send a reminder message on the user's mobile phone APP. Other methods can also be used, which are not specifically limited here.

[0078] Specifically, after obtaining the target operating frequency of the compressor, the controller is also configured to: when the target operating frequency is greater than the upper limit value of the preset operating frequency range, modify the target operating frequency to the upper limit value of the operating frequency range; when the target operating frequency is less than the lower limit value of the preset operating frequency range, modify the target operating frequency to the lower limit value of the operating frequency range.

[0079] For example, see Fig.10 , Fig.10It is the fifth working flow chart of the controller provided by the embodiment of the present invention, and the controller is configured to execute steps S501 to S504. The compressor has a preset operating frequency range, for example, 0 to 150 Hz, 0 Hz is the lowest operating frequency of the compressor, indicating that the compressor is not working, and 150 Hz is the highest operating frequency of the compressor. This range data is only used as an example and can be adjusted according to the actual refrigerator product, and is not specifically limited here; after calculating the target operating frequency of the compressor, it is determined whether the target operating frequency is within the preset operating frequency range. When the target operating frequency is greater than the preset upper limit of the operating frequency range, that is, it exceeds the highest operating frequency of the compressor, the target operating frequency is modified to the upper limit of the operating frequency range, and the controller controls the compressor to operate at the highest operating frequency; when the target operating frequency is less than the preset lower limit of the operating frequency range, the target operating frequency is modified to the lower limit of the operating frequency range, and the controller controls the compressor to operate at the lowest operating frequency.

[0080] Specifically, the target operating frequency of the compressor is calculated according to the continuous operation time coefficient, the downtime time coefficient, the temperature difference and the ambient temperature, including: obtaining the time coefficient weight, the temperature difference weight and the ambient temperature weight; calculating the time proportion according to the continuous operation time coefficient, the downtime time coefficient and the time coefficient weight, calculating the temperature difference proportion according to the temperature difference and the temperature difference weight, and calculating the ambient temperature proportion according to the ambient temperature and the ambient temperature weight; accumulating the time proportion, the temperature difference proportion and the ambient temperature proportion to obtain the target operating frequency of the compressor.

[0081] For example, see Fig.11 , Fig.11 The sixth workflow diagram of the controller provided in the embodiment of the present invention, the controller is configured to execute steps S601 to S603. The memory of the controller pre-stores the weights corresponding to the duration coefficient, temperature difference and ambient temperature, obtains the duration coefficient weight, temperature difference weight and ambient temperature weight, multiplies the continuous operation duration coefficient, the shutdown duration coefficient and the duration coefficient weight to obtain the duration proportion, multiplies the temperature difference and the temperature difference weight to obtain the temperature difference proportion, and multiplies the ambient temperature and the ambient temperature weight to obtain the ambient temperature proportion; accumulates the duration proportion, the temperature difference proportion and the ambient temperature proportion to obtain the target operating frequency of the compressor, which can be specifically referred to the following formula:

[0082] Cpwm=a*Kfan*Kcomp+b*Tdelta-c*Te;

[0083] Among them, Cpwm is the target operating frequency; Kfan is the continuous operation time coefficient; Kcomp is the shutdown time coefficient; Tdelta is the temperature difference; Te is the ambient temperature; a is the time coefficient weight, such as a=5; b is the temperature difference weight, such as b=10; c is the ambient temperature weight, such as c=1. It is worth noting that the time coefficient weight a, the temperature difference weight b and the ambient temperature weight c can also take other values, which are not specifically limited here.

[0084] The refrigerator disclosed in the present invention adopts a software algorithm to calculate the target operating frequency required by the compressor according to different preset scenarios. When the bottom cooling fan fails to work normally, the refrigeration demand of the system is guaranteed and the compressor compartment is prevented from overheating, thereby avoiding endangering the user's safety.

[0085] See also Fig.12 , Fig.12 1 is a flow chart of a refrigerator compressor control method provided by an embodiment of the present invention. The refrigerator compressor control method is implemented by a controller in the refrigerator. The method includes:

[0086] S1. When it is detected that the bottom cooling fan has a shutdown failure, the actual refrigeration temperature of the refrigerator storage room and the ambient temperature of the environment in which the refrigerator is located are obtained;

[0087] S2. Calculating the temperature difference between the actual refrigeration temperature and the preset target refrigeration temperature;

[0088] S3, obtaining the recorded continuous operation time of the compressor and the shutdown time of the bottom cooling fan;

[0089] S4. Calculating a target operating frequency of the compressor according to the continuous operation time, the shutdown time, the temperature difference and the ambient temperature;

[0090] S5. Control the compressor to operate according to the target operating frequency.

[0091] For example, during the operation of the refrigerator, the bottom cooling fan may malfunction and fail to work normally due to poor line contact, structural interference blocking or drive circuit failure, resulting in a short period of fault shutdown (such as poor line contact) or a long period of fault shutdown (structural interference blocking or drive circuit failure). The compressor compartment has a maximum temperature limit for the casing, which usually cannot exceed 95°C. Due to the failure of the bottom cooling fan to shut down, the compressor cannot be cooled, and the compressor faces a closed high-temperature environment. Once the duration is too long, compressor component failure, refrigeration abnormalities or compressor compartment deformation may occur. When it is detected that the bottom cooling fan fails and stops, the actual cooling temperature detected by the compartment temperature sensor and the ambient temperature detected by the ambient temperature sensor are obtained; according to the target cooling temperature preset by the user, the temperature difference between the actual cooling temperature and the target cooling temperature is calculated, and this temperature difference can reflect the required speed of the compressor. If the actual cooling temperature is greater than the target cooling temperature and the temperature difference is large, the corresponding compressor speed must be relatively high to ensure the normal cooling demand of the compartment; after calculating the temperature difference, the continuous operation time of the compressor and the shutdown time of the bottom cooling fan are obtained. If the continuous operation time of the compressor is too long, the temperature of the compressor becomes high and affects other components in the compressor compartment; when the bottom cooling fan is stopped, the compressor cannot be cooled. When the shutdown time is too long, the operating frequency of the compressor needs to be appropriately reduced to prevent the compressor temperature from being too high; in addition, the operating frequency of the compressor is also related to the ambient temperature. Different ambient temperature ranges correspond to different compressor speeds. When the ambient temperature is higher, the heat load of the refrigerator is greater, the required cooling capacity is greater, and the corresponding compressor speed requirement is also higher. Therefore, the target operating frequency of the compressor can be calculated according to the continuous operation time, the shutdown time, the temperature difference and the ambient temperature, so that the calculated target operating frequency can meet the refrigeration demand of the compartment; the target operating frequency can ensure that the compressor compartment is always kept within a suitable temperature range under different ambient temperatures, and finally the controller controls the compressor to operate according to the target operating frequency.

[0092] Specifically, the target operating frequency of the compressor is calculated based on the continuous operating time, the downtime time, the temperature difference and the ambient temperature, including: obtaining a corresponding continuous operating time coefficient based on the continuous operating time, and obtaining a corresponding downtime time coefficient based on the downtime time; and calculating the target operating frequency of the compressor based on the continuous operating time coefficient, the downtime time coefficient, the temperature difference and the ambient temperature.

[0093] Exemplarily, in a first embodiment, the target operating frequency of the compressor can be calculated directly according to the continuous operating time, the shutdown time, the temperature difference and the ambient temperature using a specific algorithm.

[0094] In the second embodiment, in order to save calculation time and normalize the collected data to prevent the compressor from frequently changing the speed with each change of the parameters, the continuous operation time and the downtime time can be converted into corresponding coefficients for calculation. The memory of the controller pre-stores the corresponding relationship between the continuous operation time (range value) and the continuous operation time coefficient, the downtime time (range value) and the downtime time coefficient, which can be stored in a data table. When calculating the target operating frequency of the compressor, the corresponding coefficient is obtained by looking up the table. When the compressor stops (it may be defrosting), the continuous operation time of the compressor is cleared, and the corresponding continuous operation time coefficient is found in Table 1 according to the continuous operation time after clearing; when the bottom cooling fan is running, the downtime of the bottom cooling fan is cleared, and steps S1 to S5 are continued when the bottom cooling fan is detected to be stopped again. When matching different refrigeration systems, users can adjust the coefficients according to their own needs; according to the continuous operation time coefficient, the downtime time coefficient, the temperature difference and the ambient temperature, a specific algorithm is used to calculate the target operating frequency of the compressor.

[0095] Specifically, the method also includes: when recording the continuous operation time of the compressor, if the temperature difference exceeds a preset temperature difference threshold, and the continuous operation time exceeds a preset continuous operation time threshold, reporting that the compressor has failed, and controlling the compressor to shut down.

[0096] Exemplarily, when recording the continuous operation time of the compressor, if the temperature difference exceeds the preset temperature difference threshold, and the continuous operation time of the compressor exceeds the preset continuous operation time threshold, it indicates that when the compressor runs for a long time, the actual refrigeration temperature of the refrigerator is still far higher than the target refrigeration temperature. If the compressor operates normally without failure, the compartment temperature will decrease and thus approach the target refrigeration temperature. Therefore, it is determined that the compressor has failed at this time, and the compressor failure is reported. The controller controls the compressor to shut down. The fault reporting method is to display it on the refrigerator display screen, send a text message to the user remotely, or send a reminder message on the user's mobile phone APP. Other methods may also be used, which are not specifically limited here.

[0097] Specifically, the method further includes: when recording the shutdown duration of the bottom cooling fan, if the shutdown duration exceeds a preset shutdown duration threshold, reporting that a shutdown failure of the bottom cooling fan occurs.

[0098] For example, when recording the downtime of the bottom cooling fan, if the downtime exceeds the preset downtime threshold, it indicates that the bottom cooling fan fails, and the bottom cooling fan shutdown failure is reported. If the failure time is short, the shutdown may be caused by poor line contact. At this time, the failure is not urgent and does not need to be reported. On the contrary, if the failure time is long, it is necessary to report the downtime of the bottom cooling fan. The reporting method is to display it on the display screen of the refrigerator, send a text message to the user remotely, or send a reminder message on the user's mobile phone APP. Other methods can also be used, which are not specifically limited here.

[0099] Specifically, after obtaining the target operating frequency of the compressor, the method also includes: when the target operating frequency is greater than an upper limit value of a preset operating frequency range, modifying the target operating frequency to the upper limit value of the operating frequency range; when the target operating frequency is less than a lower limit value of the preset operating frequency range, modifying the target operating frequency to the lower limit value of the operating frequency range.

[0100] Exemplarily, the compressor has a preset operating frequency range, for example, 0 to 150 Hz, 0 Hz is the lowest operating frequency of the compressor, indicating that the compressor is not working, and 150 Hz is the highest operating frequency of the compressor. This range data is only used as an example and can be adjusted according to the actual refrigerator product, and is not specifically limited here. After calculating the target operating frequency of the compressor, it is determined whether the target operating frequency is within the preset operating frequency range. When the target operating frequency is greater than the preset upper limit value of the operating frequency range, that is, it exceeds the highest operating frequency of the compressor, the target operating frequency is modified to the upper limit value of the operating frequency range, and the controller controls the compressor to operate at the highest operating frequency. When the target operating frequency is less than the preset lower limit value of the operating frequency range, it indicates that the compressor is not working, the target operating frequency is modified to the lower limit value of the operating frequency range, and the controller controls the compressor to operate at the lowest operating frequency.

[0101] Specifically, the target operating frequency of the compressor is calculated according to the continuous operation time coefficient, the downtime time coefficient, the temperature difference and the ambient temperature, including: obtaining the time coefficient weight, the temperature difference weight and the ambient temperature weight; calculating the time proportion according to the continuous operation time coefficient, the downtime time coefficient and the time coefficient weight, calculating the temperature difference proportion according to the temperature difference and the temperature difference weight, and calculating the ambient temperature proportion according to the ambient temperature and the ambient temperature weight; accumulating the time proportion, the temperature difference proportion and the ambient temperature proportion to obtain the target operating frequency of the compressor.

[0102] It is worth noting that the specific working process of the refrigerator compressor control 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.

[0103] The refrigerator compressor control method disclosed in the present invention adopts a software algorithm to calculate the target operating frequency required by the compressor according to different preset scenarios. When the bottom cooling fan fails to work normally, the refrigeration demand of the system is guaranteed and the compressor compartment is prevented from overheating, thereby avoiding endangering the user's safety.

[0104] 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 and a freezing chamber; A door, used for opening and closing the storage chamber; A compressor compartment is arranged in the box body, and a compressor, a condenser and a bottom cooling fan are arranged inside the compressor compartment, and the bottom cooling fan is used to dissipate heat for the compressor and the condenser; A compartment temperature sensor is provided in the storage compartment and is used to detect the actual refrigeration temperature of the storage compartment; An ambient temperature sensor is arranged outside the box body and is used to detect the ambient temperature of the environment in which the refrigerator is located; The controller is configured as: When it is detected that the bottom cooling fan has a shutdown failure, obtaining the actual cooling temperature detected by the compartment temperature sensor, and obtaining the ambient temperature detected by the ambient temperature sensor; Calculating the temperature difference between the actual refrigeration temperature and the preset target refrigeration temperature; Obtaining the recorded continuous operation time of the compressor and the shutdown time of the bottom cooling fan; Calculating a target operating frequency of the compressor according to the continuous operation time, the shutdown time, the temperature difference and the ambient temperature; The compressor is controlled to operate according to the target operating frequency.

2. The refrigerator according to claim 1, characterized in that: The calculating the target operating frequency of the compressor according to the continuous operation time, the shutdown time, the temperature difference and the ambient temperature includes: Acquire a corresponding continuous operation duration coefficient according to the continuous operation duration, and acquire a corresponding downtime duration coefficient according to the downtime duration; The target operating frequency of the compressor is calculated according to the continuous operation duration coefficient, the shutdown duration coefficient, the temperature difference and the ambient temperature.

3. The refrigerator according to claim 1, characterized in that: The controller is also configured to: When recording the continuous operation time of the compressor, if the temperature difference exceeds a preset temperature difference threshold and the continuous operation time exceeds a preset continuous operation time threshold, a compressor failure is reported and the compressor is controlled to shut down.

4. The refrigerator according to claim 1, characterized in that: The controller is also configured to: When recording the downtime of the bottom cooling fan, if the downtime exceeds a preset downtime threshold, a shutdown failure of the bottom cooling fan is reported.

5. The refrigerator according to claim 1, characterized in that: After obtaining the target operating frequency of the compressor, the controller is further configured to: When the target operating frequency is greater than a preset upper limit value of the operating frequency range, modifying the target operating frequency to the upper limit value of the operating frequency range; When the target operating frequency is less than a preset lower limit value of the operating frequency range, the target operating frequency is modified to the lower limit value of the operating frequency range.

6. The refrigerator according to claim 2, characterized in that: The calculating the target operating frequency of the compressor according to the continuous operation time coefficient, the shutdown time coefficient, the temperature difference and the ambient temperature includes: Obtain duration coefficient weight, temperature difference weight and ambient temperature weight; Calculate the duration proportion according to the continuous operation duration coefficient, the shutdown duration coefficient and the duration coefficient weight, calculate the temperature difference proportion according to the temperature difference and the temperature difference weight, and calculate the ambient temperature proportion according to the ambient temperature and the ambient temperature weight; The duration ratio, the temperature difference ratio and the ambient temperature ratio are accumulated to obtain the target operating frequency of the compressor.

7. A refrigerator compressor control method, characterized in that: include: When the bottom cooling fan is detected to have a shutdown failure, the actual refrigeration temperature of the refrigerator storage room and the ambient temperature of the environment in which the refrigerator is located are obtained; Calculating the temperature difference between the actual refrigeration temperature and the preset target refrigeration temperature; Obtaining the recorded continuous operation time of the compressor and the shutdown time of the bottom cooling fan; Calculating a target operating frequency of the compressor according to the continuous operation time, the shutdown time, the temperature difference and the ambient temperature; The compressor is controlled to operate according to the target operating frequency.

8. The refrigerator compressor control method according to claim 7, characterized in that: The calculating the target operating frequency of the compressor according to the continuous operation time, the shutdown time, the temperature difference and the ambient temperature includes: Acquire a corresponding continuous operation duration coefficient according to the continuous operation duration, and acquire a corresponding downtime duration coefficient according to the downtime duration; The target operating frequency of the compressor is calculated according to the continuous operation duration coefficient, the shutdown duration coefficient, the temperature difference and the ambient temperature.

9. The refrigerator compressor control method according to claim 7, characterized in that: The method further comprises: When recording the continuous operation time of the compressor, if the temperature difference exceeds a preset temperature difference threshold and the continuous operation time exceeds a preset continuous operation time threshold, a compressor failure is reported and the compressor is controlled to shut down.

10. The refrigerator compressor control method according to claim 7, characterized in that: The method further comprises: When recording the downtime of the bottom cooling fan, if the downtime exceeds a preset downtime threshold, a shutdown failure of the bottom cooling fan is reported.

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