Refrigerator load detection method based on cooling rate analysis

Abstract

The invention discloses a refrigerator load detection method based on cooling rate analysis, and the method comprises the steps: calculating a cooling rate V1 value and a cooling rate V2 value before and after a door of a refrigerator is opened, establishing a rate comparison sensitivity value eta = V2 / V1, if the sensitivity value eta is greater than 1, indicating that the load of the refrigerator is increased, and if food is put into the refrigerator, the larger the sensitivity value is, the more the load of the refrigerator is increased; if the cooling rate is greater than the previous rate value, V2gt is determined; if the sensitivity eta is less than 1, the load of the refrigerator is reduced, and the smaller the sensitivity value is, the more the load is reduced. The optimal fresh-keeping effect is achieved by dynamically detecting the dynamic change of the refrigerator to the load in real time, dynamically estimating the refrigeration time required by each chamber of the refrigerator, reasonably controlling the rotating speed and distributing the refrigeration time, preventing the refrigerator from being overcooled or overheated, and improving the performance of the refrigerator.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent household appliance control, and particularly to a refrigerator load detection method based on cooling rate analysis. Background Art

[0002] Current refrigerator load detection technologies mainly use temperature sensors to control the on-off points. When the load in the refrigerating chamber is too large and the refrigeration time is too long, the following defects may exist:

[0003] 1. When the load in the refrigerating chamber of a single-system refrigerator is too large and the refrigeration time is too long, it may cause the freezer to be overcooled; in the case of a multi-system refrigerator, it may cause the temperature in the freezer or variable temperature compartment to be overheated, exceeding the on-off point and unable to refrigerate in time;

[0004] 2. When the load in the freezer increases too much and the refrigeration time in the freezer is long, it may cause the temperature in the refrigerating chamber or other compartments to reach the on-off point and not be refrigerated, and the temperature in the refrigerating or other compartments exceeds the temperature limit;

[0005] 3. Estimate the refrigeration time required for each compartment of the refrigerator through the cooling rate, reasonably change the rotation speed or reasonably allocate the refrigeration time of each compartment to achieve temperature balance in each compartment and improve the fresh-keeping function. Summary of the Invention

[0006] The purpose of the present invention is to provide a refrigerator load detection method based on cooling rate analysis to solve the above problems. According to the load change, reasonably adjust the rotation speed and allocate the refrigeration time of each compartment to achieve dynamic monitoring of the load, dynamic monitoring of the temperature, dynamic control of the compressor rotation speed, allocate the refrigeration capacity, achieve reasonable refrigeration balance in each compartment of the refrigerator, and improve the performance of the refrigerator.

[0007] The present invention realizes the above purpose through the following technical solutions:

[0008] The present invention provides a refrigerator load detection method based on cooling rate analysis, including the following steps:

[0009] Step S1, monitor the temperature of the compartment. When the temperature of the compartment reaches the on-off point L on record the start time T on until the temperature of the compartment drops to the off-point L off , and the refrigeration end time is T off ;

[0010] Step S2, calculate the difference ΔL = L off -L on between the on-off point temperature and the off-point temperature of the compartment, and divide it by the time value ΔT1 = T off1 -T on1 from the start of refrigeration to the end of refrigeration in the refrigerating chamber to obtain a cooling rate V1 = ΔL / ΔT1;

[0011] Step S3: When it is detected that the compartment door is opened and the temperature inside the compartment rises, and when it is detected that the compartment door is closed, monitor that the indoor temperature drops to the refrigeration compartment temperature start point L on and record the start time T on2 until the temperature of the compartment drops to the stop point L off The refrigeration end time is T off2 ;

[0012] Step S4: Calculate the difference ΔL = L off - L on between the start point temperature and the stop point temperature after the compartment door is opened and closed, and divide it by the time value ΔT2 = T off2 - T on2 from the start of refrigeration to the end of refrigeration in the refrigerating compartment, and obtain a cooling rate V2 = ΔL / ΔT2;

[0013] Step S5: Establish a rate comparison sensitivity value η = ΔL2 / ΔL1, and compare the magnitude relationship between η and 1 to judge the load change.

[0014] As a preference of the present invention, the compartment is a refrigerating compartment or a freezing compartment.

[0015] As a preference of the present invention, when the ambient temperature is between the start point temperature and the stop point temperature, select the time period between the second start point and the stop point after the door is opened to calculate the cooling rate.

[0016] As a preference of the present invention, when the ambient temperature is lower than the stop point temperature, the cooling time value of the cooling rate is taken within the time period between the first start point and the stop point after the door is closed to calculate the cooling rate.

[0017] As a preference of the present invention, when it is detected that the temperature of the vegetables themselves is low and the quantity is relatively large, and when it is detected that the room temperature is lower than the stop point temperature, the temperature of the entire compartment is pulled down. At this time, the sampling calculation temperature selects the time period from the next start point to the stop point to calculate the cooling rate.

[0018] As a preference of the present invention,

[0019] The beneficial effects of the present invention are as follows: By dynamically and real-time detecting the dynamic changes of the load of the refrigerator, dynamically predicting the refrigeration time required for each compartment of the refrigerator, reasonably controlling the rotation speed and distributing the refrigeration time to achieve the best fresh-keeping effect, preventing the refrigerator from being over-cooled or over-temperature, and improving the performance of the refrigerator. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the change of the cooling rate when the load increases after the door is opened.

[0021] Figure 2 It is a schematic diagram of the change of the cooling rate when the load decreases after the door is opened.

[0022] Figure 3 Schematic diagram of the change in the cooling rate when the ambient temperature is between the startup point and the shutdown point.

[0023] Figure 4 Schematic diagram of the change in the cooling rate when the ambient temperature is lower than the startup point or the food temperature is lower than the startup point. Detailed implementation manners

[0024] To make the objectives, technical solutions and advantages of the present invention clearer, the following will, in conjunction with the accompanying drawings and embodiments, elaborate in detail on the implementation method of the present invention, so as to fully understand how the present invention uses technical means to solve technical problems and achieve the implementation process of technical effects and implement accordingly.

[0025] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0026] Embodiment 1

[0027] In this embodiment, as Figure 1-2 shown, taking the refrigerating chamber as an example, when the refrigerator is in a normal state and the temperature reaches stability, when it is detected that the temperature of the refrigerating compartment reaches the startup point Lc on , start recording the time Tc on1 , until the temperature of the refrigerating compartment drops to reach the shutdown point temperature Lc off , the refrigeration end time of the refrigerating compartment is Tc off2 . Calculate the temperature ΔLc, which is the difference between the startup point temperature and the shutdown point temperature, ΔLc = Lc off - Lc on , the time from the start to the end of the refrigeration of the refrigerating compartment is ΔT1 = Tc off1 - Tc on1 , and a cooling rate Vc1 value is obtained. When the door switch is detected, the door opening flag bit is detected, the indoor temperature rises, when the door closing is detected, the indoor temperature is monitored to decrease, and when the temperature drops to the startup point Tc on2 of the compartment temperature, start timing until the compartment temperature reaches the shutdown point Tc off2 , by dividing the temperature difference from the startup point to the shutdown point by the time from the startup point to the shutdown point, ΔT2 = Tc off2 - Tc on2The cooling rate value Vc2 is obtained. This cooling rate value is compared with the rate value before the door is opened, and a rate comparison sensitivity value ηc = Vc2 / Vc1 is established. If ηc is less than 1, it means that the current cooling rate is less than the previous cooling rate, indicating that the refrigerator load has increased. The smaller the ηc value, the more the load has increased. If ηc is greater than 1, it means that the latter rate is greater than the previous rate value, indicating that the refrigerator load has decreased. The same method can be used to check the freezer load.

[0028] Example 2

[0029] Taking the freezer as an example, after the freezer temperature reaches stability, when it is detected that the temperature in the freezer compartment reaches the startup point Ld on , start recording the time Td on , until the temperature in the freezer compartment drops to the shutdown point temperature Ld off , the freezer refrigeration end time is Td off . Calculate the temperature ΔLd, which is the difference between the startup point temperature and the shutdown point temperature, ΔLd = Ld off - Ld on , the time from the end to the start of the freezer compartment refrigeration is ΔT1 = Td off1 - Td on1 , and a cooling rate value Vd1 is obtained. When the freezer door switch is detected and the door opening flag bit is detected, the indoor temperature rises. When the door is detected to be closed, the indoor temperature is monitored to decrease. When the temperature drops to the startup point Td of the compartment temperature on2 , start timing until the compartment temperature reaches the shutdown point Td off2 . By dividing the temperature difference from the startup point to the shutdown point by the time from the startup point to the shutdown point, ΔT2 = Td off2 - Td on1 , the cooling rate value Vd2 is obtained. This cooling rate value is compared with the rate value before the door is opened, and a rate comparison sensitivity value ηd = Vd2 / Vd1 is established. η d less than 1 means that the current cooling rate is less than the previous cooling rate, indicating that the refrigerator load has increased. The smaller the η d value, the more the load has increased. If η d is greater than 1, it means that the latter rate is greater than the previous rate value, indicating that the refrigerator load has decreased. The same method can be used to check the variable temperature compartment load.

[0030] Ambient temperature and special food conditions:

[0031] (1) When the ambient temperature is higher than the startup point, as Figure 1-2 shown;

[0032] (2) When the ambient temperature is between the startup point and the shutdown point, deviations may occur due to the different temperatures of the food itself. Therefore, the cooling rate is calculated based on the cooling cycle of the second startup point and the shutdown point after the door is opened. For example, Figure 3 as shown;

[0033] (3) When the ambient temperature is lower than the shutdown point: The cooling time value for calculating the cooling rate is between the first startup point and the shutdown point after the door is closed. For example, Figure 4 as shown;

[0034] (4) In the case where the temperature of the vegetables themselves is low: When it is detected that the temperature of the vegetables themselves is low and the quantity is relatively large, and the room temperature is lower than the shutdown point, the temperature of the entire compartment is pulled down. At this time, the time period from the next startup point to the shutdown point of the sampled temperature is calculated, and then the cooling rate is calculated. For example, Figure 4 as shown.

[0035] In the figure, the X-axis is time and the Y-axis is temperature. T off1 -T on1 is the cooling cycle before the door is opened, and T off2 -T on2 is the cooling cycle after the door is opened. The temperature drop within the cycle is L on -L 0ff where the set temperature remains unchanged. When it is the refrigerating compartment, the temperature drop within the cycle is represented by Lc on -Lc 0ff When it is the freezing compartment, the temperature drop within the cycle is represented by Ld on -Ld 0ff as shown.

[0036] The beneficial effects of the present invention are as follows: By using the cooling rate to judge the load, it is possible to effectively predict and prevent the overcooling or overheating of other compartments, and timely increase or decrease the rotation speed for adjustment, making the refrigerator more fresh-keeping. For example, in a single-system refrigerator, if it is judged that the load of the refrigerating compartment is too large and the refrigeration time is too long, it may cause the freezing compartment to be overcooled. At this time, the rotation speed can be reduced to refrigerate slowly. In a multi-system refrigerator, when each compartment refrigerates independently, if it is judged that the load of the refrigerating compartment is too large and the refrigeration time is too long, the freezing compartment may overheat. Then, it is necessary to control and increase the rotation speed to quickly reduce the temperature of the refrigerating compartment to the shutdown point and then refrigerate the freezing compartment. Similarly, the influence of the excessive load of the freezing compartment on the overheating of the refrigerating compartment can be handled.

[0037] By dynamically and real-time detecting the dynamic changes of the load of the refrigerator, dynamically predicting the refrigeration time required for each compartment of the refrigerator, reasonably controlling the rotation speed and distributing the refrigeration time to achieve the best fresh-keeping effect, preventing the refrigerator from being overcooled or overheating, and improving the performance of the refrigerator.

[0038] Although the present invention has been described herein with reference to illustrative embodiments thereof, the above embodiments are merely preferred embodiments of the present invention, and the embodiments of the present invention are not limited by the above embodiments. It should be understood that those skilled in the art can design many other modifications and embodiments, which will fall within the scope of the principles and spirit disclosed in this application.

Claims

1. A refrigerator load detection method based on cooling rate analysis, characterized in that, Including the following steps: Step S1, monitor the compartment temperature. When the compartment temperature reaches the startup point L on , record the start time T on , until the compartment temperature drops to the shutdown point L off . The refrigeration end time is T off ; Step S2, calculate the temperature difference ΔL = L between the chamber start-up point temperature and the shutdown point temperature off - L on divided by the time value ΔT1 = T between the start of refrigeration and the end of refrigeration in the refrigerating chamber off1 - T on1 , and obtain a cooling rate V1 = ΔL / ΔT1; Step S3: When the compartment door is detected to open and the temperature inside the compartment rises, and when the compartment door is detected to close, monitor that the indoor temperature drops to the refrigeration compartment temperature startup point L on and record the start time T on2 until the compartment temperature drops to the shutdown point L off The refrigeration end time is T off2 ; Step S4, calculate the temperature difference ΔL = L between the start-up point temperature and the shutdown point temperature after the compartment door is opened and closed off - L on divide by the time value ΔT2 = T between the start of refrigeration and the end of refrigeration in the refrigerating compartment off2 - T on2 , and obtain a cooling rate V2 = ΔL / ΔT2; Step S5, establish a rate ratio to the sensitivity value η = ΔL2 / ΔL1, and compare the magnitude relationship between η and 1 to determine the load change.

2. The refrigerator load detection method based on cooling rate analysis according to claim 1, wherein, The compartment is a refrigerating chamber or a freezing chamber.

3. A refrigerator load detection method based on cooling rate analysis according to claim 1, characterized in that, When the ambient temperature is between the starting temperature and the stopping temperature, select the time period between the second starting point and the stopping point after the door is opened to calculate the cooling rate.

4. A refrigerator load detection method based on cooling rate analysis according to claim 1, characterized in that, When the ambient temperature is lower than the stopping temperature, the cooling time for the cooling rate is taken as the time period between the first starting point and the stopping point after the door is closed to calculate the cooling rate.

5. A refrigerator load detection method based on cooling rate analysis according to claim 1, characterized in that, When it is detected that the temperature of the vegetables themselves is low and the quantity is relatively large, and it is detected that the room temperature is lower than the stopping temperature, the temperature of the entire compartment is pulled down. At this time, the sampling calculation temperature selects the time period from the next starting point to the stopping point to calculate the cooling rate.

6. The refrigerator load detection method based on cooling rate analysis according to claim 1, wherein, In step S5, comparing the magnitude relationship between η and 1 to determine the load change specifically includes: when η is less than 1, it means that the subsequent cooling rate is less than the previous cooling rate, indicating that the load of the refrigerator has increased; when η is greater than 1, it means that the subsequent rate is greater than the previous rate value, indicating that the load of the refrigerator has decreased.

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