Method and system for adjusting operation rate of refrigerator based on shutdown time of press

Abstract

The invention provides a method and system for adjusting the operating rate of a refrigerator based on the shutdown time of a compressor. The method comprises the steps that the preset target operating rate and the current shutdown time of the compressor are obtained; according to the target operation rate and the current shutdown time, target operation time of the compressor is calculated; the difference value between the current temperature and the target shutdown temperature of each chamber of the refrigerator is obtained, the real-time operation time of the compressor is predicted based on the real-time cooling rate of each chamber, and the real-time operation time is the operation time needed for reaching the target shutdown temperature at the current operation rotating speed; comparing the target operation time with the real-time operation time to generate a comparison result; and according to the comparison result, the compressor is controlled to operate at the target rotating speed. By establishing closed-loop feedback between the target operation time and the predicted operation time, the rotating speed of the compressor is dynamically adjusted, and therefore accurate control over the starting rate is achieved.

Description

Technical Field

[0001] This application relates to the field of refrigeration equipment control technology, and in particular to a method and system for adjusting the refrigerator operating rate based on compressor downtime. Background Technology

[0002] A refrigerator's refrigeration system maintains the internal temperature by periodically starting and stopping the compressor, and its operating efficiency depends on the percentage of time the compressor is on. The application of inverter technology aims to improve energy efficiency and temperature stability, and precise control of the compressor's operating rate is the core requirement for achieving energy saving and stable operation.

[0003] Fixed start / stop thresholds or time ratio adjustments constitute the basic control method of the compressor. This method triggers start / stop based on a preset temperature point or allocates operating intervals according to a fixed time sequence.

[0004] In this control method, the compressor running time cannot match the actual cooling demand, the insufficient accuracy of the start-up rate adjustment leads to energy consumption fluctuations, and the lack of a coordination mechanism between the speed and the start-up rate results in lag response and poor temperature stability. Summary of the Invention

[0005] This application provides a method and system for adjusting the refrigerator operating rate based on the compressor downtime, in order to solve the problem of slow response and poor temperature stability caused by the lack of coordination mechanism between the rotation speed and the operating rate.

[0006] In a first aspect, this application provides a method for adjusting the refrigerator operating rate based on the compressor shutdown time, including:

[0007] Obtain the preset target uptime and the current downtime of the compressor;

[0008] Calculate the target operating time of the compressor based on the target uptime and the current downtime;

[0009] The difference between the current temperature of each compartment of the refrigerator and the target shutdown temperature is obtained, and the real-time running time of the compressor is predicted based on the real-time cooling rate of each compartment. The real-time running time is the running time required to reach the target shutdown temperature at the current running speed.

[0010] The target runtime is compared with the real-time runtime to generate a comparison result;

[0011] Based on the comparison results, the compressor is controlled to operate at the target speed.

[0012] In some feasible embodiments, calculating the target operating time of the compressor based on the target uptime and the current downtime includes:

[0013] Multiply the target uptime rate by the current downtime to obtain the first product;

[0014] Calculate the first difference, which is the difference between 1 and the target power-on rate;

[0015] The target running time is calculated based on the first product and the first difference, whereby the target running time is the quotient of the first product and the first difference.

[0016] In some feasible embodiments, predicting the real-time operating time of the compressor based on the real-time cooling rate of each compartment includes:

[0017] Calculate the temperature difference between the current temperature of the compartment and the target shutdown temperature of the compartment;

[0018] Calculate the cooling time of the compartment, where the cooling time is the quotient of the temperature difference between the compartments and the real-time cooling rate of the compartments;

[0019] The sum of the cooling times of all compartments is determined as the real-time operating time of the compressor.

[0020] In some feasible embodiments, the target speed includes a first target speed and a second target speed; the first target speed is less than the current operating speed, and the second target speed is greater than the current operating speed;

[0021] The step of controlling the compressor to operate at a target speed based on the comparison result includes:

[0022] When the comparison result indicates that the target running time is greater than the real-time running time, the compressor is controlled to run at the first target speed.

[0023] When the comparison result shows that the target running time is less than the real-time running time, the compressor is controlled to run at the second target speed.

[0024] In some feasible embodiments, the step of controlling the compressor to operate at the target speed includes:

[0025] The cooling capacity and energy efficiency ratio of the compressor at the current speed are obtained, wherein the energy efficiency ratio is the ratio of the cooling capacity to the power consumption;

[0026] The total cooling capacity is calculated based on the difference between the real-time running time and the target running time.

[0027] The target speed is determined based on the total cooling capacity and the ratio of cooling capacity to energy efficiency ratio of the compressor at different speeds.

[0028] In some feasible embodiments, determining the target rotational speed based on the total cooling capacity and the ratio of the cooling capacity to the energy efficiency ratio of the compressor at different rotational speeds includes:

[0029] Obtain the correspondence between the cooling capacity per unit time and the energy efficiency ratio of the compressor at different speeds;

[0030] Based on the total cooling capacity and the corresponding relationship, a relationship combination is calculated, wherein the relationship combination is a combination of one or more rotational speeds and operating times that provide an equivalent total cooling capacity;

[0031] In the aforementioned combination, the preset energy efficiency ratio speed is the target speed.

[0032] In some feasible embodiments, the method further includes:

[0033] Acquire the state changes of the refrigerator door;

[0034] When the state change is that the door is open, record the door opening event;

[0035] After the door opening event ends, the real-time cooling rate of each room is reacquired.

[0036] In some feasible embodiments, prior to obtaining the preset target power-on rate, the following steps are included:

[0037] The shortest operating time required for the compressor to reach the stop point at the lowest permissible operating speed, and the longest operating time required for the compressor to reach the stop point at the highest permissible operating speed are obtained.

[0038] Based on the current downtime, a first uptime rate is calculated based on the shortest running time;

[0039] Based on the current downtime, a second uptime rate is calculated based on the longest uptime.

[0040] Based on the first power-on rate and the second power-on rate, the range of the target power-on rate is determined.

[0041] In some feasible embodiments, after controlling the compressor to operate at the target speed based on the comparison result, the following steps are included:

[0042] Obtain the stop point of the compressor;

[0043] When the compressor reaches the stop point, the compressor is controlled to stop running.

[0044] Secondly, this application provides a system for adjusting the refrigerator operating rate based on compressor shutdown time, comprising:

[0045] The acquisition unit is configured to acquire a preset target uptime and the current downtime of the compressor;

[0046] The prediction unit is configured to calculate the target operating time of the compressor based on the target start-up rate and the current shutdown time; and to obtain the difference between the current temperature and the target shutdown temperature of each compartment of the refrigerator, and to predict the real-time operating time of the compressor based on the real-time cooling rate of each compartment, wherein the real-time operating time is the operating time required to reach the target shutdown temperature at the current operating speed.

[0047] The control unit is configured to compare the target running time with the real-time running time to generate a comparison result; and to control the compressor to run at the target speed based on the comparison result.

[0048] As can be seen from the above technical solutions, this application provides a method and system for adjusting the refrigerator's operating rate based on the compressor's shutdown time. The method includes: obtaining a preset target operating rate and the current shutdown time of the compressor; calculating a target operating time of the compressor based on the target operating rate and the current shutdown time; obtaining the difference between the current temperature and the target shutdown temperature of each compartment of the refrigerator, and predicting the real-time operating time of the compressor based on the real-time cooling rate of each compartment, wherein the real-time operating time is the operating time required to reach the target shutdown temperature at the current operating speed; comparing the target operating time and the real-time operating time to generate a comparison result; and controlling the compressor to operate at the target speed based on the comparison result. By establishing a closed-loop feedback between the target operating time and the predicted operating time, the compressor speed is dynamically adjusted, thereby achieving precise control of the operating rate. Attached Figure Description

[0049] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 A flowchart illustrating the method for adjusting refrigerator operating rate based on compressor downtime provided in this application embodiment;

[0051] Figure 2 This is a schematic diagram of the compressor speed determination process provided in an embodiment of this application;

[0052] Figure 3 This is a schematic diagram of the system for adjusting the refrigerator operating rate based on the compressor downtime, as provided in an embodiment of this application. Detailed Implementation

[0053] The embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described below do not represent all embodiments consistent with this application. They are merely examples of systems and methods consistent with some aspects of this application as detailed in the claims.

[0054] In the traditional control field of refrigerator refrigeration systems, fixed start / stop thresholds or time-proportional adjustments constitute the basic control method for compressors. This control method relies on preset temperature points to trigger the compressor's start and stop, or on allocating operation and interval cycles according to a fixed time sequence.

[0055] Systems using this control method operate based on pre-set temperature thresholds. When the internal temperature rises to the start-up threshold, the compressor starts running; when the temperature drops to the stop-down threshold, the compressor stops working. Another implementation method controls the compressor according to a fixed time ratio, cycling through preset running and stopping times, without considering actual changes in heat load.

[0056] In this traditional control method, the inability to match compressor runtime with actual cooling demand is a significant problem. The system cannot adjust its operating strategy based on real-time changes in heat load, causing the compressor to run for a fixed amount of time even when the heat load is low, resulting in energy waste, or to run for insufficient time when the heat load is high, resulting in ineffective temperature reduction inside the compressor. This mismatch between runtime and actual demand directly leads to insufficient accuracy in operating rate regulation, causing large fluctuations in energy consumption and preventing the system from maintaining a highly efficient operating state.

[0057] Fixed start-stop control also suffers from a lack of coordination between compressor speed and operating rate. The compressor typically operates at a fixed speed, unable to adapt to varying heat load conditions by adjusting its speed. This lack of coordination leads to system lag; when the heat load changes, the compressor cannot adjust its operating state in time, resulting in poor temperature stability and large temperature fluctuations within the compressor compartment. This lag not only affects cooling efficiency but also reduces food preservation quality and increases system energy consumption.

[0058] In summary, existing technologies lack dynamic prediction and real-time adjustment capabilities. This application calculates the target operating time by obtaining a preset target uptime rate and the current downtime, and simultaneously predicts the real-time operating time based on the actual temperature difference between each compartment and the real-time cooling rate. The compressor speed is dynamically adjusted by comparing these two time values. This method solves the problem of mismatch between operating time and actual demand in traditional control, reduces energy consumption fluctuations through precise uptime rate control, establishes a synergistic mechanism between speed and uptime, and improves system response speed and operational stability.

[0059] This application provides a method for adjusting the refrigerator operating rate based on compressor downtime. By establishing a closed-loop feedback between the target operating time and the predicted operating time, the compressor speed is dynamically adjusted, thereby achieving precise control of the operating rate.

[0060] like Figure 1 As shown, the procedure includes the following steps:

[0061] S100: Obtain the preset target uptime and the current downtime of the compressor.

[0062] The target operating rate is a user-preset or system-defined expected value that represents the percentage of time the compressor runs within a complete compressor cycle, reflecting expectations for the equipment's energy consumption and cooling performance. For example, users can directly set a 50% operating rate through the refrigerator's human-machine interface, or the system can automatically generate a target value based on historical operating data and energy-saving strategies.

[0063] In some embodiments, before obtaining the preset target power-on rate, the range of the target power-on rate is determined.

[0064] Specifically, the shortest operating time required for the compressor to reach the shutdown point at the minimum permissible operating speed, and the longest operating time required for the compressor to reach the shutdown point at the maximum permissible operating speed are obtained. The minimum permissible operating speed is a specified minimum rotational speed at which the compressor can operate stably, representing the minimum power output state that the compressor can achieve while maintaining the refrigeration cycle. Similarly, the maximum permissible operating speed is a specified maximum rotational speed at which the compressor can operate safely.

[0065] The shortest running time is the shortest duration required for the compressor to run continuously from the moment of startup at the lowest permissible operating speed until all compartments in the refrigerator have dropped from their starting temperature to their respective target stopping temperature. It represents the strongest cooling speed that can be achieved under the current heat load, thus determining the upper limit of the possible operating rate.

[0066] The longest running time is the longest duration required for the compressor to run continuously at its maximum permissible operating speed from the moment of startup until all compartments in the refrigerator have cooled from their starting temperature to their respective target stopping temperature. It represents the time required to operate at the weakest cooling rate under the current heat load, thus determining the lower limit of the possible operating rate.

[0067] Based on the current downtime, a first uptime rate is calculated based on the shortest running time; based on the current downtime, a second uptime rate is calculated based on the longest running time; and based on the first uptime rate and the second uptime rate, the range of the target uptime rate is determined.

[0068] First, control the compressor to run one complete cooling cycle at the lowest permissible operating speed, and record the actual time taken from startup to all compartments reaching the target shutdown temperature, i.e., the shortest operating time, reflecting the fastest cooling speed achievable under the current heat load. Similarly, control the compressor to run one complete cooling cycle at the highest permissible operating speed, and record the actual time taken, i.e., the longest operating time, reflecting the longest time required to complete the work under the weakest cooling capacity.

[0069] After obtaining the shortest and longest runtimes, the uptime is calculated based on the known current downtime. The first calculation uses the shortest runtime and the current downtime to calculate the first uptime using the defined formula, as follows:

[0070] K max =T runmin / (T runmin +T stop );

[0071] Among them, K max As the first activation rate, T runmin For the shortest running time, T top This is the current downtime.

[0072] Specifically, the first uptime is equal to the shortest running time divided by the sum of the shortest running time and the current downtime. Under ideal conditions, when the compressor is working at full capacity, the maximum percentage of the running time that can be achieved in the entire cycle is the upper limit of the uptime.

[0073] The second startup rate is calculated using the same startup rate definition formula, as follows:

[0074] K min =T runmax / (T runmax +T stop );

[0075] Among them, K min For the second highest operating rate, Trunmax For the longest running time, T top This is the current downtime.

[0076] Specifically, the second uptime is equal to the longest running time divided by the sum of the longest running time and the current downtime. Under the most unfavorable conditions, when the compressor operates at its lowest speed, the minimum percentage of the running time that must occupy in the entire cycle is the lower limit of the uptime.

[0077] Using the calculated first and second power-on rates as boundaries, a closed interval is defined as the target power-on rate range. For example, if the calculated first power-on rate is 70% and the second power-on rate is 30%, then the target power-on rate range is defined as 30% to 70%.

[0078] By calculating the compressor's operating time under physical performance limits and combining it with the actual heat load represented by the current downtime, the theoretical upper and lower limits of the achievable uptime rate are calculated, thus solving the control failure problem that may be caused by blindly setting targets.

[0079] The current downtime is the duration of the compressor's operation from the last time it stopped to the time it started running in the current work cycle. It reflects the rate of heat load accumulation under the combined effects of multiple factors such as refrigerator load, insulation performance, and ambient temperature. The current downtime can be obtained by timing the real-time clock module of the refrigerator control system.

[0080] S200: Calculate the target operating time of the compressor based on the target uptime and the current downtime.

[0081] The target uptime, as a control objective, reflects the desired balance between energy efficiency and performance. The current downtime reflects the real-time heat load and serves as the input for calculating the expected duration of the current operating cycle. Through a division operation, the target uptime and current downtime are converted into a specific target operating time value, which is the baseline operating time the compressor needs to strive to achieve within this control cycle.

[0082] In some embodiments, the target uptime is multiplied by the current downtime to obtain a first product; a first difference is calculated, where the first difference is the difference between 1 and the target uptime; based on the first product and the first difference, the target running time is calculated, where the target running time is the quotient of the first product and the first difference, as shown in the following formula:

[0083] T run =(K target *T stop current ) / (1-K target );

[0084] S300: Obtain the difference between the current temperature and the target shutdown temperature of each compartment of the refrigerator, and predict the real-time running time of the compressor based on the real-time cooling rate of each compartment. The real-time running time is the running time required to reach the target shutdown temperature at the current operating speed.

[0085] The temperature difference is the absolute value of the arithmetic difference between the current temperature of a certain compartment of the refrigerator and the preset target shutdown temperature of that compartment. The temperature value represents the amount of heat that needs to be removed to adjust the compartment from its current hot state to the desired cold state.

[0086] Cooling time is an estimated time value calculated for a single compartment of the refrigerator. It represents the theoretical duration required to cool that single compartment from its current temperature to the target shutdown temperature under the current cooling capacity.

[0087] Real-time running time is an estimated time value calculated for the refrigerator's refrigeration system. It represents the total remaining running time required for all compartments of the refrigerator to reach their respective target shutdown temperatures while the compressor maintains its current operating speed.

[0088] Understandably, the S300 process is calculated for all compartments in the refrigerator. For example, if the refrigerator has three compartments, the real-time cooling rate of each compartment is calculated to predict the real-time running time of the compressor.

[0089] To determine the real-time operating time of the compressor, in some embodiments, the temperature difference between the current temperature of the compartment and the target shutdown temperature of the compartment is calculated;

[0090] Calculate the cooling time of the compartment, where the cooling time is the quotient of the temperature difference between the compartments and the real-time cooling rate of the compartments;

[0091] The sum of the cooling times of all compartments is determined as the real-time operating time of the compressor.

[0092] The system uses an array of temperature sensors deployed in each room to read and acquire the current temperature of each room in real time. Simultaneously, it calls the preset target shutdown temperature for each room, calculates the temperature difference for each room, and quantifies the cooling workload required for that room.

[0093] In addition to obtaining the temperature difference, it is also necessary to determine the real-time cooling rate of each compartment under the current operating conditions. The cooling rate is a dynamic parameter that reflects the extent to which the compressor can reduce the temperature of that compartment per unit time at the current speed. The real-time cooling rate can be obtained by monitoring the temperature change curve of that compartment within a recent time window and calculating the slope, or by querying a pre-calibrated mapping table based on compressor speed, compartment characteristics, and historical data.

[0094] For each compartment, a time estimation is performed separately. For each compartment, the temperature difference is divided by the real-time cooling rate; the quotient is the cooling time for that compartment. The cooling time equals the workload divided by the work efficiency. Here, the workload is the temperature difference, and the work efficiency is the cooling rate. The calculated cooling time is the independent time required for that compartment to complete its own cooling task under the current conditions.

[0095] Finally, the cooling times calculated for all compartments are added together, and the total time value is the real-time running time of the compressor.

[0096] For example, at a certain moment, the calculated cooling time for the refrigerator compartment is 5 minutes, for the variable temperature compartment it is 8 minutes, and for the freezer compartment it is 10 minutes. Adding these three times together gives a real-time running time of 23 minutes. This result means that if the compressor maintains its current speed, it is expected to run for another 23 minutes before all three compartments of the refrigerator reach their respective shutdown temperatures.

[0097] S400: Compare the target runtime with the real-time runtime to generate a comparison result.

[0098] The comparison result is a logical judgment output generated by comparing the target running time with the real-time running time. This result is used to indicate the direction of the deviation between the current predicted running state and the expected running state, that is, whether the real-time running time is shorter or longer than the target running time.

[0099] S500: Based on the comparison result, control the compressor to operate at the target speed.

[0100] The target speed is the operating speed that the compressor needs to adjust next, determined based on the comparison results. This speed is the output command of the control system. By changing the compressor's operating frequency or power, the predicted real-time running time is made to approach the target running time. It can be understood that the target speed must be taken within the range of the compressor's minimum and maximum allowable speeds.

[0101] In some embodiments, before controlling the compressor to operate at a target speed, the following steps are included:

[0102] The cooling capacity and energy efficiency ratio of the compressor at the current speed are obtained, wherein the energy efficiency ratio is the ratio of the cooling capacity to the power consumption;

[0103] The total cooling capacity is calculated based on the difference between the real-time running time and the target running time.

[0104] The target speed is determined based on the total cooling capacity and the ratio of cooling capacity to energy efficiency ratio of the compressor at different speeds.

[0105] Cooling capacity is the amount of heat a compressor can remove from the refrigerator compartment per unit time at a specific operating speed. It characterizes the compressor's cooling ability, and its value changes with the operating speed; the cooling capacity increases as the speed increases and decreases as the speed decreases. Cooling capacity is obtained through performance curves provided by the compressor manufacturer or through parameter mapping tables embedded in the control system. These mapping tables establish the correspondence between compressor speed and corresponding cooling capacity.

[0106] The energy efficiency ratio (EER) is the ratio of the cooling capacity produced by a compressor to the electrical power consumed, used to measure the compressor's energy utilization efficiency. The EER varies with the compressor's operating conditions, exhibiting a higher value in the low-to-medium speed range and decreasing in the high-speed range. The EER parameter is obtained from performance data provided by the compressor manufacturer or from a preset lookup table in the control system, which reflects the energy efficiency characteristics at different speeds.

[0107] Before adjusting the speed, the parameters of the current operating state are obtained. A preset compressor performance mapping table is consulted to obtain the cooling capacity per unit time and energy efficiency ratio corresponding to the current speed. Then, the total cooling capacity requirement is calculated. Based on the difference between the real-time operating time and the target operating time, the amount of operating time that needs to be extended or shortened is determined. Combining this with the cooling capacity per unit time at the current speed, these two values ​​are multiplied to calculate the total cooling capacity requirement to be maintained. This ensures that regardless of how the speed is adjusted, the final total cooling volume remains constant, thus guaranteeing that the refrigerator achieves the expected cooling effect.

[0108] After determining the total cooling capacity, the optimization calculation phase begins. Based on the cooling capacity and energy efficiency ratio data at different speeds, various combinations of speeds and operating times that can provide the equivalent total cooling capacity are determined. For each possible speed option, the operating time corresponding to providing the required total cooling capacity at that speed is calculated, and the energy efficiency performance at that operating point is evaluated.

[0109] In some embodiments, determining the target rotational speed based on the total cooling capacity and the ratio of the cooling capacity to the energy efficiency ratio of the compressor at different rotational speeds includes:

[0110] Obtain the correspondence between the cooling capacity per unit time and the energy efficiency ratio of the compressor at different speeds;

[0111] Based on the total cooling capacity and the corresponding relationship, a relationship combination is calculated, wherein the relationship combination is a combination of one or more rotational speeds and operating times that provide an equivalent total cooling capacity;

[0112] In the aforementioned combination, the preset energy efficiency ratio speed is the target speed.

[0113] The cooling capacity per unit time refers to the amount of heat that the compressor can remove from the refrigerator compartment per unit time when it is running at a specific speed. For each speed point, the running time required to provide the required total cooling capacity is calculated based on the cooling capacity per unit time corresponding to that speed. A pairing scheme between speed and running time is generated for each speed point, and all feasible pairing schemes together constitute a set of operating parameter combinations, i.e., relationship combinations.

[0114] By comparing the energy efficiency ratio (EER) values ​​at each speed point, the speed corresponding to the scheme with the highest EER value is selected as the final target speed. This ensures that among all possible schemes capable of completing the same cooling task, the operating mode with the highest energy utilization efficiency is chosen; and that energy utilization efficiency is maximized while meeting cooling requirements. Once the target speed is determined, speed adjustment operations will be implemented based on this speed value.

[0115] In some embodiments, the target speed includes a first target speed and a second target speed; wherein, the first target speed is a specific speed value calculated based on comparison results, which is lower than the current operating speed of the compressor. The first target speed slows down the cooling process by reducing the compressor's rotational speed. The second target speed is also a specific speed value calculated based on comparison results, which is higher than the current operating speed of the compressor. The second target speed accelerates the cooling process by increasing the compressor's rotational speed.

[0116] like Figure 2 As shown, when the comparison result indicates that the target running time is greater than the real-time running time, the compressor is controlled to run at the first target speed.

[0117] When the comparison result shows that the target running time is less than the real-time running time, the compressor is controlled to run at the second target speed.

[0118] When the comparison results indicate that the target running time is greater than the real-time running time, it is determined that the compressor's operating speed needs to be reduced. A first target speed is obtained through calculation or querying; this speed value is lower than the compressor's current operating speed. The calculation process can be based on a preset speed step table or calculated according to a specific ratio based on the time deviation. A control command is then generated to adjust the compressor's operating speed to the first target speed.

[0119] When the comparison results show that the target running time is less than the real-time running time, it is determined that the compressor's operating speed needs to be increased. A second target speed is obtained through calculation or query. This speed value is higher than the compressor's current operating speed. The calculation method is the same as for the speed reduction case. Based on preset parameters or deviation calculations, a control command is generated to adjust the compressor's operating speed to the second target speed.

[0120] The speed regulation command is executed through the compressor's drive circuit, changing the power supply frequency or voltage to achieve smooth speed changes. Through continuous comparison and adjustment, the real-time running time gradually approaches the target running time.

[0121] With bidirectional speed regulation capabilities, the compressor can extend its operating time by slowing down or shorten it by increasing speed, thus achieving precise control over the operating rate. This control method enhances responsiveness and adaptability, enabling the compressor's operating status to promptly match actual cooling demands, providing reliable execution assurance for maintaining a stable internal temperature and achieving precise operating rate control.

[0122] After controlling the compressor to operate at a target speed based on the comparison results, in some embodiments the compressor's stop point is obtained; if the compressor reaches the stop point, the compressor is controlled to stop operating.

[0123] The shutdown point is a specific state node in the compressor's operation that meets the stopping conditions. This state node is determined by both temperature and time conditions. When the refrigerator's operating state reaches this node, the compressor should stop working. The shutdown point is identified by real-time monitoring of the temperature of each compartment and comparing it with the target shutdown temperature. It also requires a comprehensive judgment based on whether the operating time has reached the expected target.

[0124] The compressor continuously acquires operating status information during operation, collects current temperature data of each compartment in real time through a temperature sensor network, and records the cumulative operating time of the compressor.

[0125] The identification process is based on two independent temperature and time conditions. The temperature condition is that the current temperature of all compartments reaches or falls below their respective preset target shutdown temperature, indicating that the refrigeration task has been completed. The time condition is that the cumulative running time of the compressor reaches or exceeds the calculated target running time, indicating that the time control target has been achieved.

[0126] When either the temperature or time condition is met first, the shutdown point is determined to have been reached, ensuring the timeliness of the shutdown operation. Whether the temperature or time reaches the target first, the correct shutdown decision can be made.

[0127] After identifying the shutdown point, the system executes a stop operation. The control system sends a stop command to the compressor's drive circuit, smoothly stopping the compressor by cutting off power or sending an enable signal. After the stop operation is completed, a new stop cycle begins, awaiting the triggering of the next start-up conditions. This termination control process ensures that the compressor stops working at the appropriate time, avoiding both insufficient cooling due to premature shutdown and energy waste caused by delayed shutdown.

[0128] In some embodiments, the method further includes:

[0129] Acquire the state changes of the refrigerator door;

[0130] When the state change is that the door is open, record the door opening event;

[0131] After the door opening event ends, the real-time cooling rate of each room is reacquired.

[0132] Door status changes refer to the change in position of the refrigerator door from a closed state to an open state or vice versa. These changes reflect the user's actions in accessing the refrigerator and are factors affecting the internal thermal environment. Door status changes are detected by a door switch sensor, which typically uses magnetic or mechanical switches to accurately identify the door's open / closed state transitions.

[0133] The door opening event is the process of detecting the door changing from a closed state to an open state. The event indicates that hot air from outside has begun to enter the chamber, affecting the temperature stability and heat load of the chamber. The door opening event is triggered by the state change signal of the door switch sensor, and the control system records the timestamp and duration of the event.

[0134] For example, a door switch sensor installed between the cabinet and the door can detect the position status of the door in real time. The sensor output signal is transmitted to the control unit to form a continuous door status data stream. The control system reads the sensor status at a fixed sampling period and identifies status changes by comparing the status differences of adjacent sampling points.

[0135] When the door status changes from closed to open, an opening event is recorded. The event record may include the timestamp of the event and continuous monitoring of the door status to determine the duration of the event.

[0136] After the door opening event ends, i.e., after the door status returns from open to closed, the parameter update process is initiated. Because the entry of hot external air during the door opening process causes a rise in chamber temperature and an increase in heat load, the original cooling rate parameters no longer accurately reflect the current thermodynamic characteristics. By re-executing the cooling rate acquisition process, monitoring the temperature changes in each chamber over a recent period, the real-time cooling rate of each chamber is recalculated.

[0137] The newly acquired cooling rate parameter replaces the original parameter value, ensuring rapid adaptation to changes in the thermal environment caused by door opening. This makes subsequent real-time running time predictions more accurate, and timely parameter updates can effectively eliminate the impact of door opening events on control accuracy.

[0138] like Figure 3As shown, based on the above-mentioned method for adjusting the refrigerator operating rate based on the compressor downtime, some embodiments of this application also provide a system for adjusting the refrigerator operating rate based on the compressor downtime, including:

[0139] The acquisition unit 100 is configured to acquire a preset target start-up rate and the current downtime of the compressor;

[0140] The prediction unit 200 is configured to calculate the target operating time of the compressor based on the target start-up rate and the current shutdown time; and to obtain the difference between the current temperature and the target shutdown temperature of each compartment of the refrigerator, and to predict the real-time operating time of the compressor based on the real-time cooling rate of each compartment, wherein the real-time operating time is the operating time required to reach the target shutdown temperature at the current operating speed.

[0141] The control unit 300 is configured to compare the target running time with the real-time running time to generate a comparison result; and to control the compressor to run at a target speed based on the comparison result.

[0142] As can be seen from the above technical solutions, this application provides a method and system for adjusting the refrigerator's operating rate based on the compressor's shutdown time. The method includes: obtaining a preset target operating rate and the current shutdown time of the compressor; calculating a target operating time of the compressor based on the target operating rate and the current shutdown time; obtaining the difference between the current temperature and the target shutdown temperature of each compartment of the refrigerator, and predicting the real-time operating time of the compressor based on the real-time cooling rate of each compartment, wherein the real-time operating time is the operating time required to reach the target shutdown temperature at the current operating speed; comparing the target operating time and the real-time operating time to generate a comparison result; and controlling the compressor to operate at the target speed based on the comparison result. By establishing a closed-loop feedback between the target operating time and the predicted operating time, the compressor speed is dynamically adjusted, thereby achieving precise control of the operating rate.

[0143] Similar parts between the embodiments provided in this application can be referred to mutually. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods extended from the solution of this application without creative effort shall fall within the scope of protection of this application.

Claims

1. A method of adjusting a refrigerator on time based on a press machine down time, characterized in that, The method comprises: obtaining a preset target startup rate and a current downtime of the compressor; calculating a target running time of the compressor according to the target startup rate and the current downtime; obtaining a difference between a current temperature of each compartment of the refrigerator and a target downtime temperature, and predicting a real-time running time of the compressor based on a real-time cooling rate of each compartment, the real-time running time being a running time required to reach the target downtime temperature at a current running speed; comparing the target running time with the real-time running time to generate a comparison result; controlling the compressor to run at a target speed according to the comparison result.

2. The method of claim 1, wherein the refrigerator ON probability is adjusted based on the press machine downtime. The calculation of the target running time of the compressor according to the target startup rate and the current downtime comprises: multiplying the target startup rate and the current downtime to obtain a first product; calculating a first difference, the first difference being a difference between 1 and the target startup rate; calculating the target running time based on the first product and the first difference, the target running time being a quotient of the first product and the first difference.

3. The method of claim 1, wherein the refrigerator ON / OFF ratio is adjusted based on the press machine downtime. The prediction of the real-time running time of the compressor based on the real-time cooling rate of each compartment comprises: calculating a temperature difference between the current temperature of the compartment and the target downtime temperature of the compartment; calculating a cooling time of the compartment, the cooling time being a quotient of the temperature difference of the compartment and the real-time cooling rate of the compartment; determining a sum of the cooling times of all compartments as the real-time running time of the compressor.

4. The method of claim 1, wherein the refrigerator ON / OFF ratio is adjusted based on the press machine downtime. The target speed comprises a first target speed and a second target speed, the first target speed being less than the current running speed, and the second target speed being greater than the current running speed; The control of the compressor to run at a target speed according to the comparison result comprises: when the comparison result is that the target running time is greater than the real-time running time, controlling the compressor to run at the first target speed; when the comparison result is that the target running time is less than the real-time running time, controlling the compressor to run at the second target speed.

5. The method of claim 4, wherein the refrigerator ON probability is adjusted based on the press machine downtime. Before the control of the compressor to run at a target speed, the method comprises: obtaining a refrigerating capacity and an energy efficiency ratio of the compressor at a current speed, the energy efficiency ratio being a ratio of the refrigerating capacity and an electricity consumption; calculating a total refrigerating capacity according to a difference between the real-time running time and the target running time; determining a target speed based on the total refrigerating capacity and a proportion of the refrigerating capacity and the energy efficiency ratio of the compressor at different speeds.

6. The method of claim 5, wherein the refrigerator ON probability is adjusted based on the press machine downtime. The determination of the target speed based on the total refrigerating capacity and the proportion of the refrigerating capacity and the energy efficiency ratio of the compressor at different speeds comprises: obtaining a corresponding relationship between unit time refrigerating capacity and energy efficiency ratio of the compressor at different speeds; calculating a relationship combination according to the total refrigerating capacity and the corresponding relationship, the relationship combination being a combination of one or more speeds and running times that provide equivalent total refrigerating capacity; determining a preset energy efficiency ratio speed in the combination as the target speed.

7. The method of claim 1, wherein the refrigerator ON probability is adjusted based on the press machine downtime. The method further comprises: obtaining a state change of a door body of the refrigerator; when the state change is that the door body is opened, recording an opening event; After the door opening event ends, the real-time cooling rate of each compartment is re-acquired.

8. The method of claim 1, wherein the refrigerator ON probability is adjusted based on the press machine downtime. Before the target start-up rate is acquired, the method comprises: acquiring the shortest running time required for the compressor to run to a shutdown point at the lowest allowable running speed, and the longest running time required for the compressor to run to the shutdown point at the highest allowable running speed; calculating a first start-up rate based on the shortest running time according to the current shutdown time; calculating a second start-up rate based on the longest running time according to the current shutdown time; confirming the range of the target start-up rate based on the first start-up rate and the second start-up rate.

9. The method of claim 1, wherein the refrigerator ON / OFF ratio is adjusted based on the press machine downtime. After the compressor is controlled to run at the target speed according to the comparison result, the method comprises: acquiring the shutdown point of the compressor; controlling the compressor to stop running in the case where the compressor reaches the shutdown point.

10. A system for adjusting a refrigerator on time based on a press machine down time, characterized in that, The method comprises: an acquiring unit configured to acquire a target start-up rate and a current shutdown time of a compressor; a predicting unit configured to calculate a target running time of the compressor according to the target start-up rate and the current shutdown time; and acquire the difference between the current temperature and the target shutdown temperature of each compartment of a refrigerator, and predict the real-time running time of the compressor based on the real-time cooling rate of each compartment, the real-time running time being the running time required to reach the target shutdown temperature at the current running speed; a control unit configured to compare the target running time and the real-time running time to generate a comparison result; and control the compressor to run at a target speed according to the comparison result.

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