A control system for dual-temperature air-cooled kitchen cabinets

Abstract

The present invention relates to the field of air-cooled kitchen cabinet control, specifically disclosing a control system for a dual-temperature air-cooled kitchen cabinet, comprising: a refrigeration start module that matches fan operating parameters based on the difference between the measured temperature in each temperature zone and the set temperature, and adaptively adjusts the fan operating parameters based on the cooling rate; a defrost trigger module that integrates three parameters: compressor operating time, evaporator temperature, and frost thickness, and evaluates defrost intensity using dynamic weighted fusion analysis; a defrost control module that initially sets defrost parameters based on defrost intensity, uses a machine learning model to estimate the temperature rise in the refrigerated area and adjusts the defrost parameters, selecting a low-interference defrost period based on the frequency of cabinet door openings; and a defrost termination module that monitors the temperature zones and evaporator temperatures in real time and terminates defrost early if a threshold is exceeded. The present invention addresses the dynamic balance problem of synchronized defrosting in a single system with two temperature zones for refrigeration and freezing, achieving precise temperature control, reduced energy consumption, and simplified operation.

Description

Technical Field

[0001] The invention relates to the field of air-cooling kitchen cabinet control, in particular to a control system for a dual-temperature air-cooling kitchen cabinet. Background Art

[0002] Traditional dual-temperature air-cooled kitchen cabinets utilize two independent air-cooling control systems, with two dedicated controllers independently controlling the refrigeration and freezer temperature zones. This dual-control solution has two significant drawbacks: First, the hardware structure is complex. The controllers can be installed using separate cutouts or integrated into the same control panel. Either approach results in a cumbersome cabinet cutout process and an increased number of parts, which in turn drives up material procurement and assembly labor costs. Second, the user experience is poor, requiring individual temperature zone operating parameters and independent on / off control, resulting in a cumbersome interaction process.

[0003] To overcome these technical bottlenecks, the industry has innovated by adopting a single intelligent control system, combined with precision air duct design, to achieve precise control of dual temperature zones. This solution optimizes airflow distribution and collaborates with temperature sensors to reduce system complexity and manufacturing costs, while significantly streamlining user operations and significantly improving product usability and market competitiveness.

[0004] For example, the existing Chinese patent with publication number CN116608629A discloses a high-efficiency dual-temperature air-cooled freezer, comprising a cabinet and a door, wherein the cabinet is provided with a freezer compartment, a refrigerator compartment, and an evaporation compartment; the evaporation compartment is provided with a refrigeration element and a first fan; the evaporation compartment is provided with a first air supply channel and a first return air channel, both of which are used to connect the evaporation compartment and the freezer compartment, and the air intake end of the first fan is connected to the first return air channel; the refrigerator compartment is provided with a second air supply channel and a second return air channel, and the refrigerator compartment is provided with a second fan, the second air supply channel is used to connect the evaporation compartment and the refrigerator compartment, and the second return air channel is used to connect the refrigerator compartment and the second air supply channel. This invention can realize two different low-temperature storage functions of the freezer compartment and the refrigerator compartment through a single set of refrigeration elements, and achieve efficient and rapid refrigeration, effectively improving the refrigeration performance of the freezer.

[0005] The above patent is based on the collaborative design of a single set of refrigeration elements and air ducts to construct an integrated dual-zone temperature control solution, which shows significant advantages in cost control and ease of operation. However, this technical solution still has key technical gaps when dealing with complex operating conditions. The typical working condition is: when the refrigerator is in deep cooling mode, a constant low-temperature environment needs to be maintained, and the freezer enters the defrost program at the same time, accompanied by a rapid rise in local temperature. In such extreme scenarios of cold and hot interaction, how to achieve dynamic temperature balance in the dual temperature zones, reduce cooling loss and temperature control delay through a single control system has become a technical difficulty that needs to be overcome. In-depth analysis of the control strategy and energy management mechanism under this working condition has important engineering practical significance for improving the single-system dual-temperature zone technical solution. Summary of the Invention

[0006] In view of the above problems, the present invention proposes a control system for a dual-temperature air-cooled kitchen cabinet to realize the function of controlling the air-cooled kitchen cabinet.

[0007] The technical solution adopted by the present invention to solve its technical problem is: the present invention provides a control system for a dual-temperature air-cooled kitchen cabinet, including: a refrigeration start-up module: obtains the actual measured temperatures of the refrigeration area and the freezing area, and compares them with the set temperatures of the corresponding temperature zones respectively; when the actual measured temperature of any temperature zone is higher than its set temperature, refrigeration is triggered, the compressor is started, the refrigeration intensity is determined according to the difference between the actual measured temperature and the set temperature, and the fan operating parameters are set and adjusted to control the cooling speed.

[0008] Defrost trigger module: monitors the cumulative operating time of the compressor, the evaporator temperature of the freezing zone and the frost thickness. When at least one of the above parameters reaches the preset warning threshold, it triggers defrosting of the freezing zone, shuts down the compressor, and evaluates the defrosting intensity based on the dynamic weighted fusion analysis of the above parameters.

[0009] Defrost control module: Initially set the defrost parameters according to the defrost intensity. The defrost parameters include the defrost heating temperature and the defrost duration. Estimate the temperature rise of the refrigerated area under the initial defrost parameters and compare them with the corresponding thresholds. Adjust the initial defrost parameters and determine the defrost time interval according to the frequency of cabinet door opening during the period.

[0010] Defrost end module: During the defrost process, the temperature of the two temperature zones and the evaporator is monitored in real time. It is determined whether the defrost needs to be terminated in advance based on the monitored temperature. If so, it is terminated immediately. Otherwise, the defrost is terminated after the defrost time is reached.

[0011] Compared with the existing technology, the control system of a dual-temperature air-cooled kitchen cabinet described in the present invention has the following beneficial effects: 1. System cost reduction and simplified operation: a single compressor and a single control system are used to replace the traditional dual independent controllers, and the hardware complexity and user operation steps are reduced through the linkage constraint of the air duct parameters.

[0012] 2. Improve user experience: Users do not need to set the operating parameters of each temperature zone and independent control switches separately, making the operation process simpler.

[0013] 3. Precise control of dual temperature zones: Through precise air duct design, temperature sensor coordination and dynamic control strategy, the temperature stability of dual temperature zones is ensured.

[0014] 4. Optimize the dynamic balance of the two temperature zones: When defrosting the freezer, the system estimates the temperature rise in the refrigerator and dynamically adjusts the defrost parameters. It selects a low-interference defrost period based on the frequency of cabinet door openings. This ensures that temperature fluctuations in the refrigerator remain within a safe threshold during defrosting, minimizing the impact on the refrigerator temperature. This maintains a dynamic balance between the two temperature zones and resolves temperature control delays caused by hot and cold conflicts.

[0015] 5. Enhanced adaptability to complex working conditions: Refrigeration can match the cooling intensity according to the difference between the measured temperature and the set temperature and adaptively adjust the fan operating parameters; the defrost trigger integrates three parameters: compressor duration, evaporator temperature, and frost thickness, and uses dynamic weighted fusion analysis to accurately evaluate the defrost intensity, overcoming the defect of misjudgment of a single parameter, enabling the system to better cope with different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a system module connection diagram of the present invention.

[0018] Figure 2 This is a schematic diagram of the control principle of the dual-temperature air-cooled kitchen cabinet of the present invention.

[0019] Figure 3 This is a diagram of the architecture of the dual-temperature air-cooled kitchen cabinet control system of the present invention.

[0020] Figure 4 It is the refrigeration working flow chart of the present invention.

[0021] Figure 5 This is a defrost trigger judgment flow chart of the present invention. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] See also Figure 1 、 Figure 2 、 Figure 3 As shown, the present invention provides a control system for a dual-temperature air-cooled kitchen cabinet, comprising a refrigeration start module, a defrost trigger module, a defrost control module, and a defrost end module.

[0024] The defrost trigger module is connected to the refrigeration start module and the defrost control module respectively, and the defrost end module is connected to the defrost control module.

[0025] It should be noted that the present invention realizes dual-temperature zone control through one controller, wherein only one relay is used to control refrigeration in the refrigeration zone, and two relays in the freezing zone control refrigeration and defrosting respectively, and the refrigeration zone and the freezing zone share a compressor.

[0026] It should be noted that defrosting only affects the freezer compartment. During defrosting, the freezer compartment's refrigeration relay disconnects and the defrost relay closes, starting defrosting. The refrigerator compartment stops completely during defrosting, and the compressor stops running. After defrosting is complete, the compressor starts, and the fans in the refrigerator and freezer compartments begin running, allowing low-temperature refrigerant to enter the corresponding air ducts.

[0027] It should be noted that the key cooperation of the dual-temperature air-cooled kitchen cabinet in the present invention is as follows: (1) Refrigerant circulation: the compressor pressurizes the refrigerant → the condenser dissipates heat and liquefies → the throttling component reduces the pressure → the refrigerant in the single evaporator absorbs heat and vaporizes to generate a cold source → the refrigerant returns to the compressor to complete the closed cycle.

[0028] (2) Air duct and temperature control: If the temperature in temperature zone A is higher than the set value, the controller drives fan A to draw cold air from the evaporator into temperature zone A to reduce the temperature.

[0029] If the temperature in temperature zone B is higher than the set value, the controller drives fan B to draw cold air from the evaporator into temperature zone B to reduce the temperature.

[0030] If both temperature zones reach the set value, the controller shuts down fans A / B. If cooling is not required for a long time, the compressor can be shut down in conjunction with the controller.

[0031] (3) Cooling capacity distribution: The cooling capacity generated by a single evaporator is distributed to temperature zone A or B as needed by starting and stopping fans A / B. When the fan is not working, the cooling capacity is temporarily stored around the evaporator and will be quickly supplied after it is started.

[0032] The refrigeration startup module obtains the measured temperatures of the refrigeration area and the freezing area, and compares them with the set temperatures of the corresponding temperature zones respectively; when the measured temperature of any temperature zone is higher than its set temperature, refrigeration is triggered, the compressor is started, the refrigeration intensity is determined based on the difference between the measured temperature and the set temperature, and the fan operating parameters are set and adjusted to control the cooling speed.

[0033] Further, see Figure 4 As shown, the specific working process of the refrigeration start module is: obtaining the measured temperatures of the two temperature zones through the built-in temperature sensors of the refrigeration zone and the freezing zone.

[0034] The measured temperatures of the two temperature zones are compared with their corresponding set temperatures. If the measured temperature of a temperature zone is higher than its set temperature, the temperature zone has a cooling demand, the cooling is triggered, and the compressor is started. Otherwise, the cooling is not triggered.

[0035] The difference between the measured temperature and the set temperature in the cooling demand temperature zone is obtained, and the difference is substituted into the preset correspondence between the temperature difference and the cooling intensity to obtain the cooling intensity of the cooling demand temperature zone.

[0036] If only the cold storage area has a cooling demand, the relay in the cold storage area is energized, the air duct is opened, and the fan starts running. Based on the quantitative mapping relationship between the set cooling intensity and the fan operating parameters, combined with the cooling intensity of the cold storage area, the fan operating parameters of the cold storage area are screened and set. The fan operating parameters include the speed and the air duct opening.

[0037] If only the freezing zone has cooling demand, the refrigeration relay of the freezing zone will be energized, the air duct will be opened, and the fan will start running. The fan operating parameters will be analyzed and set according to the cooling intensity of the freezing zone.

[0038] If both the refrigeration area and the freezer area have cooling requirements, obtain the cooling intensity ratio of the two temperature zones. Based on the set comparison table of the dual-temperature zone cooling intensity ratio and the dual-temperature zone fan operating parameters, match the fan operating parameters of the two temperature zones and set them.

[0039] The fan operating parameters are adaptively adjusted according to the cooling speed of the cooling demand temperature zone.

[0040] During the cooling process, the temperature of the cooling demand temperature zone is detected in real time. If the temperature drops to the set temperature of the temperature zone or lower, the cooling is stopped.

[0041] It should be noted that the temperature sensor is installed in the center of the two temperature zones or on the main channel of air circulation to ensure that the temperature sensor can be exposed to representative air temperature, and the temperature sensor is away from the air outlet of the refrigeration equipment, heater, fan, etc. to prevent local temperature fluctuations from affecting the measurement value.

[0042] It should be noted that the set temperature of the temperature zone refers to the temperature corresponding to the temperature zone triggering refrigeration, that is, when the temperature of the temperature zone is higher than the set temperature, refrigeration starts.

[0043] It should be noted that the greater the difference between the measured temperature in the temperature zone and the set temperature, the greater the cooling intensity; the greater the cooling intensity, the greater the operating parameters of the fan, that is, the fan speed and air duct opening will increase accordingly.

[0044] It should be noted that the fan speed directly affects the air circulation volume. The higher the speed, the greater the amount of air flowing through the refrigeration element per unit time, the more cold air is brought into the kitchen cabinet, and the stronger the cooling intensity; the larger the air duct opening, the greater the amount of cold air delivered per unit time, and the stronger the cooling intensity.

[0045] It should be noted that the fan speed is adjusted by controlling the fan rotation speed, and the fan air volume is adjusted by controlling the air duct opening or the air duct opening area.

[0046] It should be noted that the analysis process of the operating parameters of the fans in the freezing area is based on the same principle as that of the fans in the refrigeration area.

[0047] It's important to note that because the refrigerated and frozen areas share a single compressor, the system utilizes a single refrigeration cycle. This is limited by the overall cooling capacity threshold. When both zones operate simultaneously in cooling mode, the system's cooling capacity must be dynamically allocated. This process requires not only precise control of the cooling intensity in the refrigerated and frozen areas, but also the implementation of linked constraints and coordinated optimization of fan operating parameters such as speed and duct opening.

[0048] It should be noted that during the refrigeration process, if the temperature sensor in the refrigeration demand temperature zone detects that the temperature in the zone has dropped to the set temperature or lower, the refrigeration will stop. If the refrigeration of both temperature zones stops, a shutdown signal will be sent to the compressor to avoid wasting electricity due to excessively low temperature. The compressor will restart after the temperature in the temperature zone rises.

[0049] In one specific embodiment, the set temperature of the refrigerated area is 5°C, and the set temperature of the frozen area is -18°C. During the refrigeration process of the refrigerated area, if the temperature sensor built into the refrigerated area detects that the temperature reaches 5°C or lower, the refrigeration of the refrigerated area will stop; during the refrigeration process of the frozen area, if the temperature sensor built into the frozen area detects that the temperature reaches -18°C or lower, the refrigeration of the frozen area will stop. If the refrigeration of both the refrigerated area and the frozen area stops, the compressor will automatically stop.

[0050] Furthermore, the specific working process of the adaptive adjustment of the fan operating parameters is: setting a monitoring period during the cooling process and setting each monitoring time point within the monitoring period according to the principle of equal time intervals.

[0051] The temperature of the cooling demand temperature zone at each monitoring time point during the monitoring period is obtained, the cooling rate corresponding to each monitoring time point is analyzed, and the average is calculated to obtain the cooling rate of the cooling demand temperature zone.

[0052] Based on the fan operating parameters and cooling speeds corresponding to each historical refrigeration operation, a correlation relationship between the fan operating parameters and the cooling speed is established, and the fan operating parameters of the cooling demand temperature zone are substituted into the correlation relationship to obtain a reference cooling speed for the cooling demand temperature zone.

[0053] If the cooling speed of the cooling demand temperature zone is lower than the reference cooling speed and the deviation between the two is greater than the preset cooling speed deviation threshold, the fan operating parameters need to be adjusted; otherwise, the fan operating parameters do not need to be adjusted.

[0054] Substitute the cooling speed deviation of the cooling demand temperature zone into the preset relationship between the cooling speed deviation and the fan operating parameter adjustment amount to obtain the adjustment amount of the fan operating parameter in the cooling demand temperature zone and make corresponding adjustments.

[0055] It should be noted that the method for analyzing the cooling rate corresponding to the monitoring time point is: divide the temperature drop at the monitoring time point relative to the previous monitoring time point by the interval between the monitoring time points to obtain the cooling rate corresponding to the monitoring time point.

[0056] It should be noted that with the increase of years of use, the dual-temperature air-cooled kitchen cabinet will experience equipment aging and performance degradation, and the refrigeration performance will also decline, so that the actual cooling rate may be lower than the reference cooling rate, that is, the actual cooling effect will be lower than the ideal cooling effect.

[0057] It should be noted that based on the fan operating parameters and cooling speed corresponding to each historical refrigeration operation, the output of the fan speed and the duct opening on the cooling speed is determined, and then when the cooling speed is lower than the reference value and the fan operating parameters need to be adjusted, the adjustment amount of the fan speed and the duct opening is determined.

[0058] In this embodiment, the present invention ensures temperature stability in dual temperature zones through precise air duct design, temperature sensor coordination, and dynamic control strategies.

[0059] The defrost trigger module monitors the cumulative running time of the compressor, the evaporator temperature of the freezing zone and the frost thickness. When at least one of the above parameters reaches a preset warning threshold, it triggers defrost in the freezing zone, shuts down the compressor, and evaluates the defrost intensity based on a dynamic weighted fusion analysis of the above parameters.

[0060] Further, see Figure 5 As shown, the specific working process of triggering defrost in the freezing zone in the defrost trigger module is: setting a sampling interval, and collecting the cumulative running time of the compressor, the evaporator temperature and the frost thickness in real time through the sensor.

[0061] Set the first and second level warning values ​​for the cumulative running time of the compressor, evaporator temperature and frost thickness.

[0062] If any of the parameters including the cumulative running time of the compressor, the evaporator temperature and the frost thickness reaches or exceeds the second-level warning value, the defrosting of the freezing area will be directly triggered.

[0063] If all three parameters have not reached their second-level warning values, the three parameters will be compared with their first-level warning values ​​respectively. If one parameter reaches or exceeds its first-level warning value, a warning signal will be generated.

[0064] Count the number of warning signals. If the number of warning signals is greater than or equal to 2, defrosting of the freezing zone is triggered.

[0065] It should be noted that the cumulative compressor operating time, evaporator temperature, and frost thickness are the core parameters for determining defrost. The cumulative compressor operating time reflects the workload and continuous operation status of the refrigeration system and is an important time-dimension indicator for determining the degree of equipment fatigue and potential frost risk. The evaporator temperature directly reflects the evaporator's heat exchange efficiency. Abnormal temperature drops are often associated with increased thermal resistance caused by frost. Frost thickness is a direct quantitative indicator of frost formation. Exceeding the threshold thickness will significantly affect the evaporator's heat exchange performance and system operating efficiency.

[0066] It should be noted that the frost thickness in the freezing zone is monitored by an infrared sensor or a capacitive sensor.

[0067] It should be noted that the second-level warning value is higher than the first-level warning value. If the second-level warning value is reached, defrosting is directly triggered. If the first-level warning value is reached but the second-level warning value is not reached, there is a hidden danger and a warning signal is generated.

[0068] It should be noted that if defrosting of the freezing area is triggered, the refrigeration relay of the freezing area will be disconnected, the defrost relay will be energized, the compressor will stop working, and the refrigeration of the refrigeration area will stop.

[0069] It should be noted that in actual applications, there are three defrost triggering modes. The first is triggered by the cumulative compressor operating time. The longer the compressor operates, the more likely it is to frost on the evaporator surface. The accumulated operating time indirectly determines the possibility of frost. When the accumulated compressor operating time reaches a set value, the system determines that the evaporator may be frosted and automatically starts the defrost process. The second is triggered by temperature sensing. When frost forms on the evaporator surface in the freezing zone, the evaporator temperature will further drop. When the temperature sensor detects that the evaporator temperature is below a certain threshold, the system will determine that the frost layer is too thick and trigger defrost. The third is direct frost thickness detection. When the frost thickness exceeds a set value, defrost is directly triggered. The present invention combines these three triggering modes to determine defrost, improving the sensitivity and reliability of defrost triggering.

[0070] It should be noted that, in a specific embodiment, the first-level warning value and the second-level warning value of the cumulative running time of the compressor are 10 hours and 12 hours respectively; the first-level warning value and the second-level warning value of the evaporator temperature are -20°C and -25°C respectively; the first-level warning value and the second-level warning value of the frost thickness are 3mm and 5mm respectively.

[0071] Furthermore, the specific working process of evaluating the defrost intensity in the defrost trigger module is as follows: S1: setting the relationship between the cumulative running time of the compressor and the defrost intensity when the cumulative running time of the compressor does not reach the warning value.

[0072] Set the relationship between the compressor cumulative running time overshoot ratio and defrost intensity when the compressor cumulative running time reaches the first level warning value and the second level warning value.

[0073] S2: Compare the accumulated running time of the compressor with its first-level warning value and second-level warning value respectively, and obtain the defrost intensity corresponding to the accumulated running time of the compressor based on the comparison results.

[0074] S3: Similarly, according to the analysis steps of S1-S2, the defrost intensity corresponding to the evaporator temperature and the defrost intensity corresponding to the frost thickness are obtained.

[0075] S4: Obtain the current operating condition of the dual-temperature air-cooled kitchen cabinet. Based on the weights of the cumulative operating time of the compressor, the evaporator temperature, and the frost thickness under each set operating condition, filter out the weights of the cumulative operating time of the compressor, the evaporator temperature, and the frost thickness under the current operating condition, and the sum of the three weights is 1.

[0076] S5: Evaluate the defrost intensity through weighted fusion analysis based on the defrost intensity and weight corresponding to the cumulative running time of the compressor, the evaporator temperature, and the frost thickness.

[0077] It should be noted that not reaching the warning value means being less than the first-level warning value; reaching the first-level warning value means being equal to or greater than the first-level warning value but less than the second-level warning value; reaching the second-level warning value means being equal to or greater than the second-level warning value.

[0078] It should be noted that the overshoot ratio of the cumulative operating time of the compressor refers to the ratio between the amount by which the cumulative operating time of the compressor exceeds the warning value and the warning value.

[0079] It should be noted that the defrost intensity when the warning value is not reached is less than the defrost intensity when the first-level warning value is reached, which is less than the defrost intensity when the second-level warning value is reached.

[0080] It should be noted that dynamic weighting is introduced to account for the varying importance of the compressor's cumulative operating time, evaporator temperature, and frost thickness under different operating conditions. In one specific embodiment, under normal operating conditions, the weight of the compressor's cumulative operating time is 30%, the weight of the evaporator temperature is 30%, and the weight of the frost thickness is 40%. Under high-temperature and high-humidity conditions, the weight of the evaporator temperature is adjusted to 40%, the weight of the frost thickness is adjusted to 45%, and the weight of the compressor's cumulative operating time is 15%. Under low-temperature and dry conditions, the weight of the compressor's cumulative operating time is 40%, the weight of the evaporator temperature is 30%, and the weight of the frost thickness is 30%.

[0081] It should be noted that the specific process of evaluating the defrost intensity through weighted fusion analysis is: multiplying the defrost intensity of the cumulative running time of the compressor, the evaporator temperature, the frost thickness and their corresponding weights respectively, and accumulating the multiplication results to obtain the comprehensively evaluated defrost intensity.

[0082] The defrost control module initially sets the defrost parameters according to the defrost intensity. The defrost parameters include the defrost heating temperature and the defrost time. The temperature rise of the refrigerated area under the initialization frost parameters is estimated and compared with the corresponding threshold value. The initialization frost parameters are adjusted and the defrost time interval is determined according to the frequency of cabinet door opening during the period.

[0083] Furthermore, the specific working process of initially setting the defrost parameters in the defrost control module is: based on the heating temperatures set under different defrost intensities, the defrost heating temperature is matched.

[0084] Detect the frost area in the freezing zone and estimate the frost layer quality based on the frost thickness.

[0085] Substitute the frost layer mass and defrost heating temperature into the set defrost time theoretical calculation formula to obtain the theoretical defrost time.

[0086] According to the deviation between the theoretical defrost time and the actual defrost time of each historical defrost operation, the estimated deviation of the theoretical defrost time is obtained.

[0087] The theoretical defrost time is corrected according to the estimated deviation of the theoretical defrost time to obtain the defrost time.

[0088] It should be noted that the heating temperature under different defrosting intensities is determined based on the characteristics of the defrosting equipment and historical experience.

[0089] Furthermore, the specific working process of adjusting the initialization frost parameters in the defrost control module is: constructing a training set according to the defrost parameters of each historical defrost operation and the temperature rise range of the corresponding refrigerated area.

[0090] With the defrost heating temperature and defrost time as input and the temperature rise of the refrigerated area as output, a correlation model between defrost parameters and refrigerated temperature rise is constructed based on the machine learning algorithm according to the training set.

[0091] The initially set defrost parameters are substituted into the correlation model to estimate the temperature rise of the refrigerated area under the initial defrost parameters.

[0092] The temperature rise of the refrigerated area under the initial frost parameters is compared with the preset refrigerated temperature rise threshold. If the temperature rise of the refrigerated area is greater than the threshold, the initial frost parameters need to be adjusted.

[0093] Build a defrost parameter correction model based on the training set.

[0094] Obtain the amount by which the temperature rise in the refrigerated area exceeds its threshold under the initial frost parameters, record it as the refrigerated temperature rise correction amount, substitute the refrigerated temperature rise correction amount into the defrost parameter correction model, reversely infer the correction amounts for the defrost heating temperature and defrost time, and adjust the initial frost parameters.

[0095] It should be noted that when the freezer area is defrosted, the compressor stops and there is no refrigeration in the refrigerated area. The temperature of the refrigerated area will inevitably rise. The defrosting heating temperature and defrosting time directly affect the temperature rise of the refrigerated area. Therefore, while the freezer area is defrosted, in order to reduce the temperature fluctuation of the refrigerated area to keep it within a safe range and ensure the food preservation effect, the defrosting parameters need to be adjusted and constrained.

[0096] Furthermore, the specific working process of building the defrost parameter correction model is: according to the training set, based on the single variable principle, the unit refrigeration temperature rise corresponding to the unit defrost heating temperature and the unit defrost time is analyzed, and the contribution of the defrost heating temperature and the defrost time to the refrigeration temperature rise is determined according to the ratio of the unit refrigeration temperature rise corresponding to the two.

[0097] Build a defrost parameter correction model, the defrost parameter correction model is , where Indicates the unit refrigeration temperature rise, They represent the unit refrigeration temperature rise corresponding to the unit defrost heating temperature and the unit defrost time, They represent the contribution of defrost heating temperature and defrost time to the refrigeration temperature rise, .

[0098] It should be noted that the contribution of the defrost heating temperature and defrost time to the refrigeration temperature rise is expressed in percentage.

[0099] Furthermore, the specific working process of determining the defrost time interval in the defrost control module is: dividing a day time period into various time periods, and obtaining the average door opening frequency in each time period within a day based on the historical opening and closing data of the freezer cabinet doors.

[0100] Based on the average door opening frequency in each time period of the day, draw a histogram of the door opening frequency by time period.

[0101] According to the door opening frequency histogram, the time interval in which the door opening frequency is less than the set value and the time span meets the defrost time length is obtained, and recorded as the defrost time interval.

[0102] It should be noted that if the freezer door is opened frequently, the entry of hot and humid air from the outside will accelerate frost formation, thereby affecting the defrosting process.

[0103] It should be noted that if the cabinet door opening frequency is less than the set value and there is more than one time interval whose time span meets the defrost time, the cabinet door opening frequency with less frequency is preferred.

[0104] In this embodiment, when the freezing area is defrosted, the temperature rise of the refrigerating area is estimated and the defrosting parameters are dynamically adjusted. In combination with the frequency of cabinet door opening, a low-interference period is selected for defrosting to ensure that the temperature fluctuation of the refrigerating area is within a safe threshold during defrosting, thereby reducing the impact on the temperature of the refrigerating area, maintaining a dynamic balance between the two temperature zones, and solving the problem of temperature control delay caused by the conflict between cold and hot.

[0105] The defrost end modular defrost process monitors the temperatures of the two temperature zones and the evaporator in real time, and determines whether defrost needs to be terminated in advance based on the monitored temperatures. If so, defrost is terminated immediately; otherwise, defrost is terminated after the defrost time is reached.

[0106] Furthermore, the specific working process of the defrost end module is: setting the threshold value for the temperature recovery of the freezing area, refrigeration area and evaporator during the defrost process, and monitoring the temperature of the freezing area, refrigeration area and evaporator in real time. If the temperature of any item reaches the threshold value for the temperature recovery, the defrost needs to be terminated in advance and immediately. Otherwise, the defrost is terminated after the defrost time is reached.

[0107] It should be noted that when defrosting is terminated, the defrost relay in the freezing area is disconnected. After the delay setting period, the compressor is turned on, the refrigeration relay in the freezing area is energized, the relay in the refrigeration area is energized, and the refrigeration area resumes work.

[0108] In this embodiment, the refrigeration can match the refrigeration intensity according to the difference between the measured temperature and the set temperature and adaptively adjust the fan operating parameters; the defrost trigger integrates the three parameters of compressor duration, evaporator temperature, and frost thickness, and uses dynamic weighted fusion analysis to accurately evaluate the defrost intensity, overcoming the defect of misjudgment of a single parameter, so that the system can better cope with different working conditions.

[0109] The above formulas are all dimensionless and numerical calculations. The formulas are obtained by collecting a large amount of data and performing software simulation to obtain the most recent real situation. The preset parameters in the formulas are set by technicians in this field according to actual conditions.

[0110] The above embodiments may be implemented in whole or in part through software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments may be implemented in whole or in part in the form of a computer program product.

[0111] Those skilled in the art will appreciate that the modules and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0112] In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0113] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0114] Finally, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A control system for a dual-temperature air-cooled kitchen cabinet, characterized in that: include: Refrigeration startup module: This module obtains the measured temperatures of the refrigeration and freezing zones and compares them with the set temperatures of the corresponding zones. When the measured temperature of any zone is higher than its set temperature, refrigeration is triggered, the compressor is started, and the cooling intensity is determined based on the difference between the measured and set temperatures. The fan operating parameters are set and adjusted to control the cooling speed. Defrost trigger module: monitors the cumulative operating time of the compressor, the evaporator temperature of the freezing zone, and the thickness of the frost. When at least one of these parameters reaches the preset warning threshold, it triggers defrost in the freezing zone, shuts down the compressor, and evaluates the defrost intensity based on a dynamic weighted fusion analysis of the above parameters. Defrost control module: Initially sets defrost parameters based on defrost intensity. Defrost parameters include defrost heating temperature and defrost duration. It estimates the temperature rise in the refrigerated area under the initial defrost parameters and compares them with the corresponding thresholds. It then adjusts the initial defrost parameters and determines the defrost time interval based on the frequency of cabinet door openings. Defrost end module: During the defrost process, the temperature of the two temperature zones and the evaporator is monitored in real time. It is determined whether the defrost needs to be terminated in advance based on the monitored temperature. If so, it is terminated immediately. Otherwise, the defrost is terminated after the defrost time is reached. The specific working process of the adaptive adjustment of the fan operating parameters is as follows: Set the monitoring period during the cooling process and set each monitoring time point within the monitoring period according to the principle of equal time intervals; Obtain the temperature of the cooling demand temperature zone at each monitoring time point during the monitoring period, analyze the cooling rate corresponding to each monitoring time point, and perform mean calculation to obtain the cooling rate of the cooling demand temperature zone; Based on the fan operating parameters and cooling speed corresponding to each historical cooling operation, a correlation relationship between the fan operating parameters and the cooling speed is established, and the fan operating parameters of the cooling demand temperature zone are substituted into the correlation relationship to obtain a reference cooling speed for the cooling demand temperature zone; If the cooling speed of the cooling demand temperature zone is lower than the reference cooling speed and the deviation between the two is greater than the preset cooling speed deviation threshold, the fan operating parameters need to be adjusted; otherwise, the fan operating parameters do not need to be adjusted; Substitute the cooling speed deviation of the cooling demand temperature zone into the preset relationship between the cooling speed deviation and the fan operating parameter adjustment amount, obtain the adjustment amount of the fan operating parameter in the cooling demand temperature zone, and make corresponding adjustments; The specific working process of triggering defrost in the freezing zone in the defrost trigger module is as follows: Set the sampling interval and use sensors to collect the cumulative running time of the compressor, evaporator temperature and frost thickness in real time; Set the first and second level warning values ​​for the cumulative running time of the compressor, evaporator temperature and frost thickness; If any of the parameters including the cumulative running time of the compressor, the evaporator temperature and the frost thickness reaches or exceeds the second-level warning value, the defrosting of the freezing zone will be directly triggered; If all three parameters do not reach their second-level warning values, the three parameters will be compared with their first-level warning values. If any parameter reaches or exceeds its first-level warning value, a warning signal will be generated; Count the number of warning signals. If the number of warning signals is greater than or equal to 2, defrosting of the freezing zone is triggered. The specific working process of evaluating the defrost intensity in the defrost trigger module is as follows: S1: Set the relationship between the cumulative running time of the compressor and the defrost intensity when the cumulative running time of the compressor does not reach the warning value; Set the relationship between the compressor cumulative running time overshoot ratio and defrost intensity when the compressor cumulative running time reaches the first level warning value and the second level warning value; S2: Compare the accumulated running time of the compressor with its first-level warning value and second-level warning value respectively, and match the defrost intensity corresponding to the accumulated running time of the compressor according to the comparison results; S3: Similarly, according to the analysis steps of S1-S2, the defrost intensity corresponding to the evaporator temperature and the defrost intensity corresponding to the frost thickness are obtained; S4: Obtain the current operating condition of the dual-temperature air-cooled kitchen cabinet. Based on the weights of the cumulative operating time of the compressor, the evaporator temperature, and the frost thickness under each set operating condition, the weights of the cumulative operating time of the compressor, the evaporator temperature, and the frost thickness under the current operating condition are screened and obtained, and the sum of the three weights is 1; S5: Evaluate the defrost intensity through weighted fusion analysis based on the defrost intensity and weight corresponding to the cumulative running time of the compressor, the evaporator temperature, and the frost thickness.

2. The control system for a dual-temperature air-cooled kitchen cabinet according to claim 1, characterized in that: The specific working process of the refrigeration startup module is as follows: The actual measured temperature of the two temperature zones is obtained through the built-in temperature sensors in the refrigeration zone and the freezing zone; Compare the measured temperatures of the two temperature zones with their corresponding set temperatures. If the measured temperature of a temperature zone is higher than its set temperature, there is a cooling demand in that temperature zone, and cooling is triggered and the compressor is started. Otherwise, cooling is not triggered. Obtain the difference between the measured temperature and the set temperature in the cooling demand temperature zone, and substitute the difference into the preset correspondence between the temperature difference and the cooling intensity to obtain the cooling intensity of the cooling demand temperature zone; If only the cold storage area has cooling demand, the cold storage area relay is energized, the air duct is opened, and the fan starts running. Based on the quantitative mapping relationship between the set cooling intensity and the fan operating parameters, combined with the cooling intensity of the cold storage area, the fan operating parameters of the cold storage area are screened and set. The fan operating parameters include speed and air duct opening. If only the freezing zone has cooling demand, the freezing zone's refrigeration relay is energized, the air duct is opened, and the fan starts running. The fan operating parameters are analyzed and set based on the freezing zone's cooling intensity. If both the refrigeration area and the freezer area have cooling requirements, obtain the cooling intensity ratio of the two temperature zones. Based on the comparison table of the set dual-temperature zone cooling intensity ratio and the dual-temperature zone fan operating parameters, match the fan operating parameters of the two temperature zones and set them. Adaptively adjust the fan operating parameters according to the cooling speed of the cooling demand temperature zone; During the cooling process, the temperature of the cooling demand temperature zone is detected in real time. If the temperature drops to the set temperature of the temperature zone or lower, the cooling is stopped.

3. The control system for a dual-temperature air-cooled kitchen cabinet according to claim 1, characterized in that: The specific working process of initially setting the defrost parameters in the defrost control module is as follows: Based on the heating temperature under different defrost intensities, the defrost heating temperature is matched; Detect the frost area in the freezing zone and estimate the frost layer quality based on the frost thickness; Substitute the frost layer mass and defrost heating temperature into the set defrost time theoretical calculation formula to obtain the theoretical defrost time; According to the deviation between the theoretical defrost time and the actual defrost time of each historical defrost operation, the estimated deviation of the theoretical defrost time is obtained; The theoretical defrost time is corrected according to the estimated deviation of the theoretical defrost time to obtain the defrost time.

4. The control system for a dual-temperature air-cooled kitchen cabinet according to claim 1, characterized in that: The specific working process of adjusting the initialization frost parameters in the defrost control module is as follows: A training set is constructed based on the defrost parameters of each historical defrost operation and the temperature rise of the corresponding refrigerated area; Using the defrost heating temperature and defrost duration as input and the refrigerated area temperature rise as output, a defrost parameter-refrigerated area temperature rise correlation model was constructed based on the training set and a machine learning algorithm. Substituting the initially set defrost parameters into the correlation model, estimating the temperature rise of the refrigerated area under the initial defrost parameters; Compare the temperature rise of the refrigerated area under the initial frost parameters with the preset refrigerated area temperature rise threshold. If the temperature rise of the refrigerated area is greater than the threshold, the initial frost parameters need to be adjusted. Build a defrost parameter correction model based on the training set; Obtain the amount by which the temperature rise in the refrigerated area exceeds its threshold under the initial frost parameters, record it as the refrigerated temperature rise correction amount, substitute the refrigerated temperature rise correction amount into the defrost parameter correction model, reversely infer the correction amounts for the defrost heating temperature and defrost time, and adjust the initial frost parameters.

5. The control system for a dual-temperature air-cooled kitchen cabinet according to claim 4, characterized in that: The specific working process of building the defrost parameter correction model is as follows: Based on the training set, the unit defrost heating temperature and unit defrost duration corresponding to the unit refrigeration temperature rise were analyzed based on the single variable principle. The contribution of the defrost heating temperature and defrost duration to the refrigeration temperature rise was determined based on the ratio of the corresponding unit refrigeration temperature rise. Build a defrost parameter correction model, the defrost parameter correction model is , where Indicates the unit refrigeration temperature rise, They represent the unit refrigeration temperature rise corresponding to the unit defrost heating temperature and the unit defrost time, They represent the contribution of defrost heating temperature and defrost time to the refrigeration temperature rise, .

6. The control system for a dual-temperature air-cooled kitchen cabinet according to claim 1, characterized in that: The specific working process of determining the defrost time interval in the defrost control module is as follows: Divide a day into time periods and obtain the average door opening frequency for each time period based on the historical door opening and closing data of the freezer area. Based on the average door opening frequency in each time period of the day, draw a door opening frequency histogram by time period; According to the door opening frequency histogram, the time interval in which the door opening frequency is less than the set value and the time span meets the defrost time length is obtained, and recorded as the defrost time interval.

7. The control system for a dual-temperature air-cooled kitchen cabinet according to claim 1, characterized in that: The specific working process of the defrost end module is as follows: Set the thresholds for the temperature rise of the freezing area, refrigerating area and evaporator during the defrost process, and monitor the temperatures of the freezing area, refrigerating area and evaporator in real time. If the temperature of any item reaches its temperature rise threshold, defrost must be terminated in advance and immediately. Otherwise, defrost will be terminated after the defrost time is reached.

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