Refrigerator fan fault detection method and system

Abstract

The invention discloses a refrigerator fan fault detection method and system. The refrigerator fan fault detection method comprises the following steps: taking refrigerator running state data of a single data unit as a detection object; according to the temperature change characteristics within the specified time, namely whether the chamber sensor temperature is higher than the chamber set temperature or not, whether the evaporator temperature is higher than the evaporator temperature at the unit ending moment or not after the first preset time when the defrosting heater stops heating; when the defrosting heater stops heating, judging whether the temperature of the evaporator is less than 0 DEG C; after a second preset time when the defrosting heater stops heating, whether the difference between the highest value and the lowest value of the temperature of the chamber sensor is larger than a preset first temperature difference value or not is judged, and whether a fan fault phenomenon exists in the using process of the refrigerator or not is judged, so that a user is reminded to intervene in time to prevent food deterioration. Or technical support is provided for further optimizing product design. According to the method, heater fault data and untight door closing fault data in the fault data can be effectively eliminated, and the detection accuracy is greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and more specifically to a refrigerator fan fault detection method and system. Background Art

[0002] In the field of modern home appliances, the proportion of smart products is gradually increasing. Smart products not only provide more convenient and practical functions, but also transmit the status data of the product operation, such as the temperature of each compartment, the working status data of each load electrical component of the refrigerator, and the ambient temperature, to the cloud. By analyzing these cloud operation status data, we can understand the actual operation of the product in the user's home and provide technical support for timely notification of user intervention and product optimization design.

[0003] The fan is one of the core components of the refrigerator. Its function is to drive the air circulation inside the refrigerator when working, realize the heat exchange between cold and hot air, and finally achieve the purpose of reducing the temperature of the refrigerator compartment. When the fan fails, it will eventually cause the temperature of the refrigerator compartment to rise, but the rise in the temperature of the refrigerator compartment is not necessarily caused by the fan failure. Therefore, it is necessary to judge whether the fan is faulty based on the specific performance of the refrigerator.

[0004] Currently, a method of using the operating status data uploaded by the refrigerator to the cloud to detect fan faults has emerged. However, after practical verification, the fan faults detected by this detection method are mixed with a large amount of data on heater failures and refrigerator doors not closed tightly. Its accuracy rate is very low and has no practical reference value. A more accurate detection method is needed. Summary of the invention

[0005] In order to solve the problem that in the above method of using the operating status data uploaded by the refrigerator to the cloud to detect fan faults, the detected fan faults are mixed with a large amount of heater faults and refrigerator door not closed tightly data, and the accuracy rate is very low.

[0006] On one hand, the present application provides a refrigerator fan fault detection method, comprising the following steps:

[0007] Acquire a single data unit, wherein the unit is: taking any one time when the defrost heater starts working as the starting time and the next time when the defrost heater starts working as the ending time, and the single data unit is: the data of the refrigerator operation status acquired in the unit;

[0008] The data of the refrigerator operation status include: compartment sensor temperature, compartment set temperature, evaporator temperature, heater working status data;

[0009] Detecting whether the compartment sensor temperature is higher than the compartment set temperature after the defrost heater stops working, if not, then ending the detection;

[0010] If yes, then detecting whether the evaporator temperature is higher than the evaporator temperature at the end time of the unit after the defrost heater stops heating for the first preset time, and if no, then ending the detection;

[0011] If yes, then detect whether the evaporator temperature is less than 0°C when the defrost heater stops heating, and if yes, end the detection;

[0012] If not, then detecting whether the difference between the highest value and the lowest value of the compartment sensor temperature is greater than the preset first temperature difference after the defrost heater stops heating for a second preset time, and if so, then ending the detection;

[0013] If not, it is determined that the refrigerator has a fan failure and corresponding alarm processing is performed.

[0014] In a feasible implementation, the compartment sensor temperature includes: a refrigerator compartment sensor temperature and a freezer compartment sensor temperature; the compartment setting temperature includes: a refrigerator compartment setting temperature and a freezer compartment setting temperature;

[0015] Whether the compartment sensor temperature is higher than the compartment setting temperature includes: whether the refrigerating compartment sensor temperature is higher than the refrigerating compartment setting temperature, and whether the freezing compartment sensor temperature is higher than the freezing compartment setting temperature.

[0016] In a feasible implementation, the data of the refrigerator operation status also includes: the temperature of the variable temperature chamber;

[0017] The step of detecting whether the difference between the highest value and the lowest value of the temperature of the compartment sensor within the second preset time when the defrost heater stops working is greater than the preset first temperature difference value also includes the steps of:

[0018] If not, detecting whether the difference between the highest temperature of the variable temperature chamber and the lowest temperature of the variable temperature chamber is greater than the preset second temperature difference within the third preset time after the defrost heater of the unit stops heating, and if so, ending the detection;

[0019] If not, it is determined that the refrigerator has a fan failure and corresponding alarm processing is performed.

[0020] In a feasible implementation, the detecting whether the difference between the highest value and the lowest value of the compartment sensor temperature is greater than a preset first temperature difference after the defrost heater stops heating for a second preset time also includes:

[0021] After the defrost heater stops heating for a second preset time, it is detected whether the difference between the highest value and the lowest value of the refrigerating chamber sensor temperature is greater than a preset first temperature difference.

[0022] In a feasible implementation, the first preset time is 5-30 minutes, and the second preset time is 10-60 minutes.

[0023] In a feasible implementation, the preset first temperature difference is 2-10°C.

[0024] In a feasible implementation, the preset second temperature difference is 1-8°C.

[0025] In a feasible implementation, the third preset time is 10-60 minutes.

[0026] On the other hand, the present application provides a refrigerator fan fault detection system, the system is used to implement the refrigerator fan fault detection method as described in any one of the above, including: a data acquisition unit, a detection and judgment unit, and an alarm unit;

[0027] The data acquisition unit is configured to: acquire a single data unit, the unit is: starting time when any defrost heater starts working and ending time when the next defrost heater starts working, the single data unit is: data of refrigerator operation status acquired in the unit;

[0028] The data of the refrigerator operation status include: compartment sensor temperature, compartment set temperature, evaporator temperature, heater working status data;

[0029] The detection and judgment unit is configured to: receive the single data unit, and detect whether the compartment sensor temperature is higher than the compartment set temperature after the defrost heater stops working, and if not, end the detection;

[0030] If yes, then detecting whether the evaporator temperature is higher than the evaporator temperature at the end time of the unit after the defrost heater stops heating for the first preset time, and if no, then ending the detection;

[0031] If yes, then detect whether the evaporator temperature is less than 0°C when the defrost heater stops heating, and if yes, end the detection;

[0032] If not, then detecting whether the difference between the highest value and the lowest value of the compartment sensor temperature is greater than the preset first temperature difference after the defrost heater stops heating for a second preset time, and if so, then ending the detection;

[0033] If not, it is determined that the refrigerator has a fan failure, and an alarm signal is sent to the alarm unit;

[0034] The alarm unit is configured to receive the alarm signal and issue an alarm.

[0035] In a feasible implementation, the data of the refrigerator operation status also includes: the temperature of the variable temperature chamber;

[0036] The detection and judgment unit is further configured to: when determining whether the difference between the highest value and the lowest value of the compartment sensor temperature is greater than a preset first temperature difference value within the second preset time for detecting that the defrost heater stops working:

[0037] If not, detecting whether the difference between the highest temperature of the variable temperature chamber and the lowest temperature of the variable temperature chamber is greater than the preset second temperature difference within the third preset time after the defrost heater of the unit stops heating, and if so, ending the detection;

[0038] If not, it is determined that the refrigerator has a fan failure and corresponding alarm processing is performed.

[0039] As can be seen from the above content, the present application provides a refrigerator fan fault detection method and system. The present application uses a single data unit, that is, the start time of a defrost heater as the starting point and the end time of the next defrost heater as the end point, and uses the data of the refrigerator operation status during the period as the detection object; according to the temperature change characteristics within the specified time, it is determined whether there is a fan fault phenomenon during the use of the refrigerator, so as to timely remind users to intervene to prevent food spoilage, or to provide technical support for further optimizing product design. This solution can effectively exclude heater fault data and door failure data in the fault data, greatly improving the accuracy of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the implementation of the present invention, and together with the specification are used to explain the principles of the embodiments of the present invention. Obviously, the accompanying drawings described below are only some embodiments of the implementation of the present invention, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0041] Figure 1 is a flow chart of a refrigerator fan fault detection method shown in an embodiment of the present application;

[0042] Figure 2 It is a structural schematic diagram of a refrigerator fan fault detection system shown in an embodiment of the present application. DETAILED DESCRIPTION

[0043] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the embodiments of the present invention will be more comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to provide a full understanding of the implementation of the embodiments of the present invention.

[0044] The fan is one of the core components of the refrigerator. Its function is to drive the air circulation inside the refrigerator when working, realize the heat exchange between cold and hot air, and finally achieve the purpose of reducing the temperature of the refrigerator compartment. When the fan fails, it will eventually cause the temperature of the refrigerator compartment to rise, but the rise in the temperature of the refrigerator compartment is not necessarily caused by the fan failure. Therefore, it is necessary to judge whether the fan is faulty based on the specific performance of the refrigerator.

[0045] In the field of modern household appliances, smart refrigerators have the function of transmitting product status data such as the temperature of each compartment, the working status data of each load electrical component of the refrigerator, and the ambient temperature to the cloud. By analyzing these cloud-based operating status data, we can understand the actual operation of the product in the user's home and provide technical support for timely notification of user intervention and product optimization design. However, the current method of using the operating status data uploaded by the refrigerator to the cloud to detect fan faults has a large amount of heater faults and refrigerator door not closed tightly mixed in the detected fan faults, resulting in a very low accuracy rate.

[0046] In order to solve the above problems, the present application provides a refrigerator fan fault detection method on the one hand, referring to Figure 1 As shown, the following steps are included:

[0047] S100: Acquire a single data unit.

[0048] The unit is: the start time is any time the defrost heater starts working, and the end time is the next time the defrost heater starts working. A single data unit is: the data of the refrigerator operating status obtained in the unit; the data of the refrigerator operating status include: compartment sensor temperature, compartment set temperature, evaporator temperature, and heater working status data.

[0049] This step defines and obtains a specific data collection period, which is from any time the defrost heater starts working to the next time the defrost heater starts working. During this period, the operating status data of the refrigerator is collected to ensure the consistency and comparability of the collected data, providing a reliable basis for subsequent fault detection.

[0050] S200: Detect whether the compartment sensor temperature is higher than the compartment set temperature after the defrost heater stops working. If not, end the detection.

[0051] Specifically, if the compartment sensor temperature is still higher than its set temperature after the defrost heater stops working, this may indicate a problem with the refrigerator's refrigeration system, such as a refrigerant leak, compressor failure, or fan failure resulting in insufficient cooling. In particular, if the fan fails, it will not be able to circulate cold air effectively, causing the temperature to drop slowly or not at all.

[0052] This step can preliminarily determine whether the refrigerator is in a normal refrigeration state. If the compartment temperature is still higher than the set temperature after the defrost heater stops working, this may mean that there is a problem with the refrigerator refrigeration system and cannot be characterized as a fan failure, so further testing is required. False alarms caused by refrigeration system problems can be excluded, narrowing the scope of fault detection.

[0053] S300: If yes, then detect whether the evaporator temperature is higher than the evaporator temperature at the end of the unit after the defrost heater stops heating for the first preset time. If not, then end the detection.

[0054] Specifically, after the defrost heater stops heating, the evaporator temperature should gradually decrease. If the evaporator temperature is higher than the temperature at the end of the data unit after the first preset time, this may indicate that the frost layer on the evaporator is too thick, affecting the effective transfer of heat, or the fan fails to work effectively to accelerate the dissipation of heat. Fan failure may cause the frost layer on the evaporator to fail to melt in time, thereby affecting the refrigeration efficiency of the refrigerator.

[0055] This step can determine whether the evaporator continues to cool effectively after the defrost heater stops. If the evaporator temperature does not drop, it may mean that there is a problem with the refrigeration system, and it is necessary to further eliminate false alarms caused by refrigeration system problems. This step can indirectly reflect the working status of the refrigerator fan by monitoring the temperature changes after the defrost heater stops working, as well as the specific change trend of the evaporator temperature. If the evaporator temperature is higher than the temperature at the end of the data unit after the first preset time, it may mean that there is a fan failure in the refrigerator, which requires further inspection and repair.

[0056] S400: If yes, then detect whether the evaporator temperature is less than 0°C when the defrost heater stops heating. If yes, then end the detection.

[0057] This step can determine whether the evaporator is overcooled. The evaporator overcooling may be caused by the door not being closed tightly or the fan failure. However, if the evaporator temperature is very low (less than 0°C), it is more likely to be caused by other factors (such as the door not being closed tightly), so further testing is required. Similarly, false alarms caused by reasons such as the door not being closed tightly can be excluded.

[0058] S500: If not, then detect whether the difference between the highest and lowest values ​​of the compartment sensor temperature is greater than the preset first temperature difference after the defrost heater stops heating for a second preset time. If so, end the detection.

[0059] Furthermore, this embodiment also needs to determine whether the temperature inside the refrigerator is stable. If the temperature fluctuates greatly, it may mean that there is a problem with the refrigeration system or the fan. However, if the temperature fluctuation is within an acceptable range, it is not a fan failure.

[0060] S600: If not, determine that the refrigerator has a fan failure and perform corresponding alarm processing.

[0061] From the above judgment results, it can be seen that if all the above detection steps do not trigger the conditions for ending the detection, that is, when all other possible faults are eliminated, if the temperature fluctuation is abnormal and the evaporator temperature fails to rise normally, it is likely caused by a fan failure. Fan failure may cause poor cold air circulation, which in turn affects the temperature distribution inside the refrigerator and the evaporator temperature. Then it can be determined that the refrigerator has a fan failure and trigger the corresponding alarm processing.

[0062] The detection method of this embodiment gradually eliminates other possible faults through a series of logical judgments and detection steps, and finally focuses on the judgment of fan failure. Each step is based on specific detection conditions and logical judgments to ensure accurate identification of fan failure. If all other conditions are not met and the temperature fluctuation is abnormal, it is determined to be a fan failure, and corresponding alarm processing is performed. It helps to quickly and accurately locate and solve refrigerator fan failure problems. The method can accurately identify fan failures and avoid false alarms caused by other factors (such as heater failure, door not closed tightly, etc.), thereby improving the accuracy and reliability of fault detection.

[0063] In some embodiments of the present application, the compartment sensor temperature includes: the refrigerator compartment sensor temperature, the freezer compartment sensor temperature; the compartment set temperature includes: the refrigerator compartment set temperature, the freezer compartment set temperature; whether the compartment sensor temperature is higher than the compartment set temperature includes: whether the refrigerator compartment sensor temperature is higher than the refrigerator compartment set temperature, and whether the freezer compartment sensor temperature is higher than the freezer compartment set temperature.

[0064] By considering the sensor temperature and set temperature of the refrigerator and freezer at the same time, this embodiment can more comprehensively reflect the temperature status inside the refrigerator. This helps to capture the temperature anomalies that may exist in different compartments, thereby more accurately locating the source of the fault. Relying only on the temperature data of a single compartment may lead to false alarms or missed alarms. For example, when the temperature of one compartment is normal and another compartment is abnormal, or when the anomaly occurs in an unmonitored compartment. By monitoring the refrigerator and freezer at the same time, this embodiment reduces the occurrence of this situation.

[0065] It is understandable that different users may have different preferences or requirements for the temperature of the refrigerator and freezer. This embodiment allows the user to set the temperature of the refrigerator and freezer separately, thereby improving the applicability and flexibility of the solution. When a temperature abnormality is detected, it can be checked separately based on the temperature data of the refrigerator and freezer, which helps to quickly locate the problem and improve maintenance efficiency.

[0066] In some embodiments of the present application, the data of the operating status of the refrigerator also includes: the temperature of the variable temperature chamber.

[0067] In step S500, it is detected whether the difference between the highest value and the lowest value of the compartment sensor temperature is greater than the preset first temperature difference value within the second preset time when the defrost heater stops working, and the steps of:

[0068] S510: If not, detect whether the difference between the highest temperature of the variable temperature chamber and the lowest temperature of the variable temperature chamber is greater than the preset second temperature difference within the third preset time after the defrost heater of this unit stops heating. If so, end the detection.

[0069] This step is to further detect the temperature change of the refrigerator variable temperature chamber after the defrost heater stops heating. If the temperature difference of the variable temperature chamber is greater than the preset second temperature difference, it indicates that the temperature change of the variable temperature chamber is abnormal, which may be caused by other factors, so the detection process ends.

[0070] S520: If not, it is determined that the refrigerator has a fan failure and corresponding alarm processing is performed.

[0071] If the temperature difference between the variable temperature chamber is not greater than the preset second temperature difference, it is determined that the refrigerator has a fan failure and the corresponding alarm processing is performed. Based on the detection results of the first two steps, if the changes in the compartment temperature and the variable temperature chamber temperature do not exceed the preset temperature difference, it can be inferred that the refrigerator fan may have a fault. Fan failure will cause poor air circulation inside the refrigerator, affecting the temperature distribution and refrigeration effect. Therefore, an alarm processing is required for timely maintenance.

[0072] This embodiment introduces the detection of the variable temperature chamber temperature and combines it with the detection of the compartment temperature to more comprehensively monitor the operating status of the refrigerator. This method not only takes into account the temperature changes of the main compartments of the refrigerator (such as the cold storage room and the freezer), but also takes into account the temperature changes of the variable temperature chamber, a special area. By comparing the temperature differences in different time periods and different areas, it is possible to more accurately determine whether the refrigerator has a fault, especially a fan fault. This embodiment provides a more reliable and accurate detection method by comprehensively detecting the changes in the compartment temperature and the variable temperature chamber temperature. This method not only improves the accuracy of detection, but also reduces the false alarm rate, which helps to promptly discover and repair refrigerator faults and ensure the normal operation of the refrigerator and the preservation quality of food.

[0073] In some embodiments of the present application, in step S500, detecting whether the difference between the highest and lowest values ​​of the compartment sensor temperature is greater than the preset first temperature difference after the defrost heater stops heating for a second preset time, and also including: detecting whether the difference between the highest and lowest values ​​of the refrigeration compartment sensor temperature is greater than the preset first temperature difference after the defrost heater stops heating for a second preset time.

[0074] This embodiment focuses on the temperature fluctuation of the refrigerating chamber after the defrosting heater stops heating. By detecting the difference between the highest and lowest values ​​of the refrigerating chamber sensor temperature and comparing it with the preset first temperature difference, the temperature stability of the refrigerating chamber after the defrosting cycle can be determined. If the temperature fluctuation exceeds the preset value, it may indicate that there is a problem with the temperature control in the refrigerating chamber, which may be related to fan failure, reduced efficiency of the refrigeration system or other factors.

[0075] By focusing on the temperature fluctuations in the cold storage room, the present embodiment can more accurately capture temperature anomalies associated with fan failures. As a commonly used storage area in refrigerators, the temperature stability of the cold storage room is crucial for the preservation of food. Therefore, careful monitoring of the temperature in the cold storage room helps to detect potential fan failures in a timely manner. Furthermore, by detecting the temperature fluctuations in the cold storage room, the present embodiment not only helps to determine whether there is a fan failure, but also provides information on fault location to a certain extent. For example, if the temperature fluctuations in the cold storage room are abnormal and accompanied by other related symptoms (such as decreased refrigeration effect, increased noise, etc.), the possibility of fan failure and its location can be more accurately inferred.

[0076] In some embodiments of the present application, the first preset time is 5-30 minutes, and the second preset time is 10-60 minutes.

[0077] Among them, the first preset time is mainly used to observe the change of evaporator temperature to confirm whether the evaporator can effectively dissipate heat after the defrost heater stops working. If the evaporator temperature does not rise significantly, it may mean that the fan is not working properly, resulting in the ineffective dissipation of heat. 5 minutes to 30 minutes. This range can be adjusted according to the specific model of the refrigerator, the size of the evaporator and the overall design of the refrigerator. A shorter time may not be enough to reflect the actual temperature change, while a longer time may make the detection process too lengthy.

[0078] The second preset time is used to observe the change of the compartment sensor temperature to determine whether the compartment temperature will fluctuate abnormally in the case of a possible fan failure. The range of 10 minutes to 60 minutes can be adjusted according to the specific situation of the refrigerator. During this time period, if the compartment temperature fluctuates slightly during this period, it may mean that the fan is working normally; if it fluctuates greatly, it may indicate that the fan is faulty.

[0079] In some embodiments of the present application, the first temperature difference is preset to 2-10°C. This difference is used to determine whether the fluctuation range of the compartment sensor temperature within the second preset time exceeds the normal range. If the fluctuation is too large, it may mean that the temperature control inside the refrigerator is affected, which may be caused by a fan failure. The difference range of 2°C to 10°C can cover most temperature fluctuation problems. If a smaller difference is set, it may be too sensitive and cause a false alarm; and if a larger difference is set, the fan failure may not be detected in time.

[0080] In some embodiments of the present application, the preset second temperature difference is 1-8°C.

[0081] It is understandable that the preset second temperature difference can be adjusted according to the configuration of the refrigerator itself, for example, between 1°C and 3°C, which may be suitable for refrigerators with higher temperature control requirements, especially those designed to store sensitive foods or medicines. A smaller difference can ensure that temperature fluctuations are kept to a minimum, thereby reducing the risk of food spoilage. However, this range may be too sensitive and prone to false alarms, especially when the ambient temperature fluctuates greatly.

[0082] Or set 3℃ to 6℃, which is suitable for most home refrigerators and provides a reasonable balance of temperature control. Within this range, the refrigerator can cope with a certain degree of ambient temperature variation while ensuring that food remains within a safe temperature range. This range also reduces the possibility of false alarms while still being able to detect obvious temperature anomalies.

[0083] When the difference preset second temperature difference is 6°C to 8°C, this range may be suitable for refrigerators with lower temperature control requirements or those designed to store less sensitive foods. A larger difference can tolerate larger ambient temperature changes, but may not detect smaller temperature anomalies in time. Therefore, this range may not be suitable for occasions requiring high-precision temperature control.

[0084] In some embodiments of the present application, the third preset time is 10-60 minutes.

[0085] Specifically, variable temperature chambers are usually used to store foods that have special temperature requirements, such as meat, dairy products, etc. Therefore, it is necessary to ensure that the detection time is long enough to capture the thermal effects that these foods may produce when the temperature changes. Users may open the refrigerator door frequently, which will affect the temperature stability inside the refrigerator. The third preset time should be long enough to offset such temperature fluctuations caused by user behavior. At the same time, the longer the detection time, the greater the possibility of capturing temperature fluctuations, but it will also increase the complexity and time cost of the detection process. Therefore, it is necessary to find a balance between accuracy and real-time performance.

[0086] It is understandable that the setting of the third preset time should maintain a certain logical relationship and consistency with the first preset time and the second preset time. For example, if the first preset time and the second preset time are short, then the third preset time should not be too long, so as to avoid the detection process being too lengthy. On the contrary, if the first preset time and the second preset time are long enough, then the third preset time can be shortened accordingly.

[0087] Another aspect of the present application provides a refrigerator fan fault detection system, referring to Figure 2 As shown, the system is used to implement any refrigerator fan fault detection method as described in the above embodiments, including: a data acquisition unit, a detection and judgment unit, and an alarm unit.

[0088] The data acquisition unit is configured to: acquire a single data unit, the unit is: any one defrost heater starts working as the starting time, the next defrost heater starts working as the end time, and the single data unit is: the refrigerator operation status data acquired in the unit. The refrigerator operation status data includes: compartment sensor temperature, compartment set temperature, evaporator temperature, heater operation status data.

[0089] The data acquisition unit is used to collect relevant data on the operating status of the refrigerator based on the working cycle of the defrost heater during the operation of the refrigerator. These data include compartment sensor temperature, compartment set temperature, evaporator temperature and heater working status. The data acquisition unit ensures that each data unit contains complete data from the start of the defrost heater to the next start of work, providing a reliable basis for subsequent detection and judgment.

[0090] The detection and judgment unit is configured to: receive a single data unit, and detect whether the compartment sensor temperature is higher than the compartment set temperature after the defrost heater stops working, and if not, end the detection.

[0091] If so, it is detected whether the evaporator temperature is higher than the evaporator temperature at the end of the unit after the first preset time when the defrost heater stops heating. If not, the detection is terminated.

[0092] If yes, then check whether the evaporator temperature is less than 0°C when the defrost heater stops heating. If yes, then end the test.

[0093] If not, then detect whether the difference between the highest and lowest values ​​of the compartment sensor temperature is greater than the preset first temperature difference after the defrost heater stops heating for a second preset time. If so, end the detection.

[0094] If not, it is determined that the refrigerator has a fan failure and an alarm signal is sent to the alarm unit.

[0095] The detection and judgment unit receives the data unit transmitted by the data acquisition unit, and first determines whether the compartment sensor temperature is higher than the compartment set temperature after the defrost heater stops working. If not, it indicates that the current operation status of the refrigerator is normal and no further detection is required. If the compartment temperature is higher than the set temperature, a series of in-depth tests are performed, including the change of the evaporator temperature, whether the evaporator temperature is less than 0°C, and whether the difference between the highest and lowest values ​​of the compartment sensor temperature is greater than the preset temperature difference. If all the detection conditions are not met, the refrigerator is judged to have a fan failure, and an alarm signal is sent to the alarm unit. The detection and judgment unit can accurately identify fan failures through logical judgment and condition screening to avoid false alarms and missed alarms.

[0096] The alarm unit is configured to receive an alarm signal and issue an alarm.

[0097] The alarm unit can ensure prompt response from users or maintenance personnel through timely alarm prompts, reduce refrigerator downtime caused by fan failure, and ensure the preservation quality of food.

[0098] In some embodiments of the present application, the data on the operating status of the refrigerator also includes: the temperature of the variable temperature chamber; when the detection and judgment unit detects whether the difference between the highest and lowest values ​​of the compartment sensor temperature within the second preset time when the defrost heater stops working is greater than the preset first temperature difference, the detection and judgment unit is also configured to: if not, detect whether the difference between the highest temperature of the variable temperature chamber and the lowest temperature of the variable temperature chamber within the third preset time after the defrost heater of this unit stops heating is greater than the preset second temperature difference. If so, end the detection; if not, judge that the refrigerator has a fan failure, and perform corresponding alarm processing.

[0099] The detection and judgment unit receives refrigerator operation status data from the data acquisition unit, which now includes not only the compartment sensor temperature, the compartment set temperature, the evaporator temperature and the heater working status, but also the variable temperature chamber temperature. Within the second preset time when the defrost heater stops working, the detection and judgment unit first checks whether the difference between the highest value and the lowest value of the compartment sensor temperature is greater than the preset first temperature difference.

[0100] If the temperature fluctuation of the compartment is within the normal range (i.e. the difference is not greater than the preset value), the detection and judgment unit will further analyze the change of the temperature of the variable temperature chamber. Within the third preset time after the defrost heater stops heating, the detection and judgment unit will check whether the difference between the highest temperature and the lowest temperature of the variable temperature chamber is greater than the preset second temperature difference.

[0101] This step is intended to more fully assess the temperature stability inside the refrigerator, especially considering that the variable temperature chamber may be set at different temperatures due to special storage needs.

[0102] If the fluctuation of the compartment temperature or the variable temperature chamber temperature does not exceed the preset difference during the above two time periods, the detection and judgment unit will determine that the refrigerator may have a fan failure. At this time, the detection and judgment unit will send an alarm signal to the alarm unit to promptly notify the user or maintenance personnel to handle it. By introducing the detection of the variable temperature chamber temperature, the detection and judgment unit can more comprehensively evaluate the operating status of the refrigerator, thereby improving the accuracy of fan fault detection. This helps to reduce false alarms or missed alarms caused by single temperature detection.

[0103] The detection and judgment unit can ensure timely alarm when a fan fault does occur through comprehensive analysis and judgment, thereby enhancing the reliability of the entire refrigerator fan fault detection system.

[0104] The present application is a refrigerator fan fault detection method and system. The present application uses the data of the refrigerator operation status of a single data unit as the detection object; according to the temperature change characteristics within the specified time, that is, whether the compartment sensor temperature is higher than the compartment set temperature; whether the evaporator temperature is higher than the evaporator temperature at the end of the unit after the first preset time when the defrost heater stops heating; whether the evaporator temperature is less than 0°C when the defrost heater stops heating; whether the difference between the highest and lowest values ​​of the compartment sensor temperature is greater than the preset first temperature difference after the second preset time when the defrost heater stops heating, etc., to determine whether there is a fan fault phenomenon in the refrigerator during use, so as to timely remind users to intervene to prevent food spoilage, or to provide technical support for further optimizing product design. The present application can effectively exclude heater fault data and door failure data in fault data, greatly improving the accuracy of detection.

[0105] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the disclosure herein. This application is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

Claims

1. A refrigerator fan fault detection method, characterized in that: The steps include: Acquire a single data unit, wherein the unit is: taking any one time when the defrost heater starts working as the starting time and the next time when the defrost heater starts working as the ending time, and the single data unit is: the data of the refrigerator operation status acquired in the unit; The data of the refrigerator operation status include: compartment sensor temperature, compartment set temperature, evaporator temperature, heater working status data; Detecting whether the compartment sensor temperature is higher than the compartment set temperature after the defrost heater stops working, if not, then ending the detection; If yes, then detecting whether the evaporator temperature is higher than the evaporator temperature at the end time of the unit after the defrost heater stops heating for the first preset time, and if no, then ending the detection; If yes, then detect whether the evaporator temperature is less than 0°C when the defrost heater stops heating, and if yes, end the detection; If not, then detecting whether the difference between the highest value and the lowest value of the compartment sensor temperature is greater than the preset first temperature difference after the defrost heater stops heating for a second preset time, and if so, then ending the detection; If not, it is determined that the refrigerator has a fan failure and corresponding alarm processing is performed.

2. A refrigerator fan fault detection method according to claim 1, characterized in that: The compartment sensor temperature includes: refrigerator compartment sensor temperature, freezer compartment sensor temperature; the compartment setting temperature includes: refrigerator compartment setting temperature, freezer compartment setting temperature; Whether the compartment sensor temperature is higher than the compartment setting temperature includes: whether the refrigerating compartment sensor temperature is higher than the refrigerating compartment setting temperature, and whether the freezing compartment sensor temperature is higher than the freezing compartment setting temperature.

3. A refrigerator fan fault detection method according to claim 1, wherein the refrigerator operation status data further includes: Changing room temperature; The step of detecting whether the difference between the highest value and the lowest value of the temperature of the compartment sensor within the second preset time when the defrost heater stops working is greater than the preset first temperature difference value also includes the steps of: If not, detecting whether the difference between the highest temperature of the variable temperature chamber and the lowest temperature of the variable temperature chamber is greater than the preset second temperature difference within the third preset time after the defrost heater of the unit stops heating, and if so, ending the detection; If not, it is determined that the refrigerator has a fan failure and corresponding alarm processing is performed.

4. A refrigerator fan fault detection method according to claim 2, characterized in that: The step of detecting whether the difference between the highest value and the lowest value of the temperature of the compartment sensor is greater than a preset first temperature difference after the defrost heater stops heating for a second preset time also includes: After the defrost heater stops heating for a second preset time, it is detected whether the difference between the highest value and the lowest value of the refrigerating chamber sensor temperature is greater than a preset first temperature difference.

5. A refrigerator fan fault detection method according to claim 1, characterized in that: The first preset time is 5-30 minutes, and the second preset time is 10-60 minutes.

6. A refrigerator fan fault detection method according to claim 1, characterized in that: The preset first temperature difference is 2-10°C.

7. A refrigerator fan fault detection method according to claim 3, characterized in that: The preset second temperature difference is 1-8°C.

8. A refrigerator fan fault detection method according to claim 3, characterized in that: The third preset time is 10-60 minutes.

9. A refrigerator fan fault detection system, characterized in that: The system is used to implement the refrigerator fan fault detection method according to any one of claims 1 to 8, comprising: a data acquisition unit, a detection and judgment unit, and an alarm unit; The data acquisition unit is configured to: acquire a single data unit, the unit is: starting time when any defrost heater starts working and ending time when the next defrost heater starts working, the single data unit is: data of refrigerator operation status acquired in the unit; The data of the refrigerator operation status include: compartment sensor temperature, compartment set temperature, evaporator temperature, heater working status data; The detection and judgment unit is configured to: receive the single data unit, and detect whether the compartment sensor temperature is higher than the compartment set temperature after the defrost heater stops working, and if not, end the detection; If yes, then detecting whether the evaporator temperature is higher than the evaporator temperature at the end time of the unit after the defrost heater stops heating for the first preset time, and if no, then ending the detection; If yes, then detect whether the evaporator temperature is less than 0°C when the defrost heater stops heating, and if yes, end the detection; If not, then detecting whether the difference between the highest value and the lowest value of the compartment sensor temperature is greater than the preset first temperature difference after the defrost heater stops heating for a second preset time, and if so, then ending the detection; If not, it is determined that the refrigerator has a fan failure, and an alarm signal is sent to the alarm unit; The alarm unit is configured to receive the alarm signal and issue an alarm.

10. A refrigerator fan fault detection system according to claim 9, characterized in that: The data of the refrigerator operation status also includes: the temperature of the variable temperature chamber; The detection and judgment unit is further configured to: when determining whether the difference between the highest value and the lowest value of the compartment sensor temperature is greater than a preset first temperature difference value within the second preset time for detecting that the defrost heater stops working: If not, detecting whether the difference between the highest temperature of the variable temperature chamber and the lowest temperature of the variable temperature chamber is greater than the preset second temperature difference within the third preset time after the defrost heater of the unit stops heating, and if so, ending the detection; If not, it is determined that the refrigerator has a fan failure and corresponding alarm processing is performed.

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