CN118242837A - Control method and system for double temperature cabinets of refrigerating chamber and freezing chamber - Google Patents
Control method and system for double temperature cabinets of refrigerating chamber and freezing chamber Download PDFInfo
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- CN118242837A CN118242837A CN202410643756.1A CN202410643756A CN118242837A CN 118242837 A CN118242837 A CN 118242837A CN 202410643756 A CN202410643756 A CN 202410643756A CN 118242837 A CN118242837 A CN 118242837A
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- 238000007710 freezing Methods 0.000 title claims abstract description 92
- 230000008014 freezing Effects 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 157
- 238000005057 refrigeration Methods 0.000 claims abstract description 90
- 238000001816 cooling Methods 0.000 claims description 28
- 238000004140 cleaning Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 230000002596 correlated effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
- F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/08—Removing frost by electric heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2600/00—Control issues
- F25D2600/06—Controlling according to a predetermined profile
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- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention relates to a control method and a control system for a double-temperature cabinet of a refrigerating chamber and a freezing chamber, and relates to the technical field of refrigeration. The method comprises the following steps: acquiring first temperature data and second temperature data, determining heating power of a heating wire and refrigerating power of a double-temperature cabinet, further determining a freezing temperature change function in a freezing chamber, and determining a refrigerating temperature change function according to the first temperature data, the second temperature data and the heating power; and acquiring a first set temperature in the refrigerating chamber and a second set temperature in the refrigerating chamber, further determining the predicted refrigerating power and the predicted heating power of the next control period, setting the refrigerating power as the predicted refrigerating power and setting the heating power as the predicted heating power when the next control period starts. According to the invention, the temperature change amplitude and the temperature data of the freezing chamber and the refrigerating chamber in the double-temperature cabinet can be matched with the heating wire to control the double-temperature cabinet, so that the accuracy of temperature control of the double-temperature cabinet is improved.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a control method and a system for a double-temperature cabinet of a refrigerating chamber and a freezing chamber.
Background
The double-temperature cabinet is a refrigerator with a freezing chamber and a refrigerating chamber separated, and in the related art, the refrigerating chamber of the double-temperature cabinet can utilize the cold energy of the freezing chamber to refrigerate, but the control accuracy of the temperature is not high, and the problems of icing, frosting and the like are easy to occur due to the too low temperature in the refrigerating chamber, so that the workload of manual cleaning is increased.
Disclosure of Invention
The invention provides a control method and a control system for a double-temperature cabinet of a refrigerating chamber and a freezing chamber, which can solve the technical problem of low control accuracy of temperature in the refrigerating chamber.
According to a first aspect of the present invention, there is provided a refrigerator and freezer compartment double temperature cabinet control method comprising:
acquiring first temperature data in a refrigerating chamber and second temperature data in a refrigerating chamber in a double-temperature cabinet at a plurality of moments of a current control period;
determining the heating power of the heating wire in the refrigerating chamber and the refrigerating power of the double-temperature cabinet in the current control period, wherein the heating wire is arranged on the liner of the refrigerating chamber and used for increasing the temperature in the refrigerating chamber when the power is on;
Determining a freezing temperature change function in a freezing chamber according to the first temperature data and the refrigerating power;
determining a refrigeration temperature change function in the refrigeration chamber according to the first temperature data, the second temperature data and the heating power;
Acquiring a first set temperature in the refrigerating chamber and a second set temperature in the refrigerating chamber;
Determining the predicted refrigeration power of the next control period according to the refrigeration temperature change function, the first temperature data and the first set temperature in the refrigeration chamber;
determining a predicted heating power of a next control period according to the predicted cooling power, the freezing temperature change function, the refrigerating temperature change function, the first temperature data, the second temperature data and the second set temperature;
at the beginning of the next control period, the cooling power is set to the predicted cooling power, and the heating power is set to the predicted heating power.
According to a second aspect of the present invention, there is provided a double temperature cabinet control system for a refrigerator and a freezer, comprising:
The first data acquisition module acquires first temperature data in a refrigerating chamber and second temperature data in the refrigerating chamber in the double-temperature cabinet at a plurality of moments of a current control period;
The first power determining module is used for determining the heating power of the heating wire in the refrigerating chamber and the refrigerating power of the double-temperature cabinet in the current control period, wherein the heating wire is arranged on the liner of the refrigerating chamber and used for increasing the temperature in the refrigerating chamber when the power is on;
a first function determining module for determining a freezing temperature change function in the freezing chamber according to the first temperature data and the refrigerating power;
A second function determining module for determining a refrigeration temperature change function in the refrigeration chamber according to the first temperature data, the second temperature data and the heating power;
the set temperature determining module is used for obtaining a first set temperature in the refrigerating chamber and a second set temperature in the refrigerating chamber;
The second power determining module is used for determining the predicted refrigeration power of the next control period according to the refrigeration temperature change function, the first temperature data and the first set temperature in the refrigeration chamber;
A third power determining module for determining a predicted heating power of a next control period according to the predicted cooling power, the freezing temperature change function, the refrigerating temperature change function, the first temperature data, the second temperature data, and the second set temperature;
And the power setting module is used for setting the refrigeration power to be the predicted refrigeration power and setting the heating power to be the predicted heating power when the next control period starts.
The technical effects are as follows: according to the invention, the temperature in the refrigerating chamber can be controlled by utilizing the cold quantity of the freezing chamber and the heating wire in the refrigerating chamber, so that the temperature control precision in the refrigerating chamber is improved, the possibility of icing, frosting and the like is reduced, and the workload of manual cleaning is reduced. The predicted refrigerating power and the predicted heating power of the next control period can be determined, so that the temperatures in the freezing chamber and the refrigerating chamber of the double-temperature cabinet can be accurately controlled in each control period, and the accuracy of temperature control of the double-temperature cabinet is improved. When the freezing temperature change function is determined, a first coefficient equation can be set according to the relation between the energy consumed by the refrigerating unit between adjacent moments and the temperature drop amplitude in the refrigerating chamber, and the first coefficient in the first coefficient equation is solved based on the first temperature data and the refrigerating power in the current control period, so that the freezing temperature change function capable of accurately describing the relation between the temperature change in the refrigerating chamber and the refrigerating power is obtained, an accurate data basis is provided for controlling the temperature regulation and the working state of the double-temperature cabinet, and the timeliness and the accuracy of temperature control are improved. When determining the refrigeration temperature change function, a second coefficient equation is set according to the relation between the energy consumed by the heating power of the heating wire between adjacent moments and the temperature rise amplitude in the refrigeration chamber and the relation between the temperature difference between the refrigeration chamber and the freezing chamber and the temperature rise amplitude in the refrigeration chamber, and then the refrigeration temperature change function for describing the relation between the temperature change in the refrigeration chamber and the refrigeration power and the heating power is determined by solving the second coefficient in the second coefficient equation. Comprehensively considering the influence of the heating power of the heating wire and the temperature difference between the refrigerating chamber and the freezing chamber, objectively reflecting the law of temperature change in the refrigerating chamber and providing a data basis for the setting of the heating power of the heating wire. When the predicted refrigerating power is determined, the data of the total temperature change of the double-temperature cabinet working at the maximum refrigerating power in the current control period can be determined, and compared with the difference value between the first set temperature and the first temperature data at the last moment in the current control period, if the double-temperature cabinet cannot reach the first set temperature in the current control period at the maximum refrigerating power, the predicted refrigerating power is set to be the maximum refrigerating power of the double-temperature cabinet so as to improve the refrigerating efficiency of the freezing chamber, otherwise, the predicted refrigerating power can be determined based on the rule described by the refrigerating temperature change function, the refrigerating efficiency of the freezing chamber can be improved, and the accuracy of temperature control is improved. When the undetermined heating power is determined, the first predicted temperature data of each moment of the next control period can be determined based on the freezing temperature change function, and then the predicted temperature change amplitude between adjacent moments in the refrigerating chamber is determined based on the refrigerating temperature change function in a time section-by-time section, so that the undetermined heating power of the next control period is determined, the control accuracy of the heating power of the heating wire is improved, the control accuracy of the temperature of the refrigerating chamber is improved through the auxiliary temperature control of the heating wire, the temperature of the refrigerating chamber can be kept near the second set temperature, the possibility of icing, frosting and other conditions is reduced, and the double-temperature cabinet is more intelligent and stable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other embodiments may be obtained according to these drawings without inventive effort to a person skilled in the art;
fig. 1 exemplarily shows a flow diagram of a refrigerator and freezer double-temperature cabinet control method according to an embodiment of the present invention;
fig. 2 schematically illustrates a schematic diagram of a refrigerator and freezer double-temperature cabinet control system according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The technical scheme of the invention is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
Fig. 1 schematically illustrates a flow chart of a method for controlling a double temperature cabinet of a refrigerating chamber and a freezing chamber according to an embodiment of the present invention, the method includes:
step S101, acquiring first temperature data in a refrigerating chamber and second temperature data in a refrigerating chamber in a double-temperature cabinet at a plurality of moments of a current control period;
Step S102, determining the heating power of the heating wire in the refrigerating chamber and the refrigerating power of the double-temperature cabinet in the current control period, wherein the heating wire is arranged on the liner of the refrigerating chamber and used for increasing the temperature in the refrigerating chamber when the power is on;
step S103, determining a freezing temperature change function in a freezing chamber according to the first temperature data and the refrigerating power;
step S104, determining a refrigerating temperature change function in the refrigerating chamber according to the first temperature data, the second temperature data and the heating power;
Step S105, obtaining a first set temperature in the refrigerating chamber and a second set temperature in the refrigerating chamber;
Step S106, according to the freezing temperature change function, the first temperature data and the first set temperature in the freezing chamber, determining the predicted refrigerating power of the next control period;
Step S107, determining the predicted heating power of the next control period according to the predicted refrigerating power, the freezing temperature change function, the refrigerating temperature change function, the first temperature data, the second temperature data and the second set temperature;
step S108, when the next control period starts, the refrigerating power is set to the predicted refrigerating power, and the heating power is set to the predicted heating power.
According to the control method for the double temperature cabinets of the refrigerating chamber and the freezing chamber, disclosed by the invention, the temperature in the refrigerating chamber can be controlled by utilizing the cold capacity of the freezing chamber and the heating wire in the refrigerating chamber, so that the temperature control precision in the refrigerating chamber is improved, the possibility of icing, frosting and the like is reduced, and the workload of manual cleaning is reduced. The predicted refrigerating power and the predicted heating power of the next control period can be determined, so that the temperatures in the freezing chamber and the refrigerating chamber of the double-temperature cabinet can be accurately controlled in each control period, and the accuracy of temperature control of the double-temperature cabinet is improved.
According to an embodiment of the present invention, in step S101, at a plurality of times of a current control cycle, first temperature data in a freezer compartment and second temperature data in a refrigerator compartment in a double temperature cabinet are acquired. The control period may be preset, for example, the control period may be three minutes or five minutes, and each time may be three seconds or five seconds.
According to the embodiment of the invention, in step S102, the heating power of the heating wire in the refrigerating chamber and the refrigerating power of the double-temperature cabinet in the current control period are determined, wherein the heating wire is arranged on the liner of the refrigerating chamber and used for increasing the temperature in the refrigerating chamber when the power is electrified. For example, the refrigerating chamber may receive the cold energy conducted in the freezing chamber, but since the temperature in the freezing chamber is lower than that in the refrigerating chamber, the manner of receiving the cold energy conducted in the freezing chamber may cause the temperature in the refrigerating chamber to be too low, for example, lower than 0 ℃, and the heating wire may be energized when the temperature in the refrigerating chamber is lowered below 0 ℃, and generate a certain amount of heat, so that the temperature in the refrigerating chamber is restored to the range of (0 ℃,5 ℃) to reduce the possibility of occurrence of frosting, icing and the like.
According to the embodiment of the invention, the heating power of the heating wire in the current control period and the refrigerating power of the double-temperature cabinet can be obtained, so that the relation among the heating power, the refrigerating power and the temperature in the refrigerating chamber and the relation among the refrigerating power and the temperature in the refrigerating chamber are determined, and a data basis is provided for setting the heating power and the refrigerating power in the next control period.
According to an embodiment of the present invention, in step S103, a freezing temperature variation function within the freezing chamber may be used to describe the relationship between the temperature variation within the freezing chamber and the cooling power. And determining a freezing temperature change function in the freezing chamber according to the first temperature data and the refrigerating power. Comprising the following steps: determining first temperature change data in a time period between a plurality of adjacent moments in a current control period according to first temperature data of the moments in the current control period; and determining a freezing temperature change function in the freezing chamber according to the first temperature change data and the refrigerating power.
According to the embodiment of the invention, for example, the current control period is five minutes, the time interval between every two moments is ten seconds, and the first temperature data of 30 moments can be obtained, so that the first temperature change data of 29 adjacent moments can be obtained. A refrigeration temperature variation function within the refrigeration chamber may be determined based on the plurality of first temperature variation data, and the refrigeration power.
According to an embodiment of the present invention, determining a freezing temperature variation function in the freezing chamber according to the first temperature variation data and the refrigerating power includes: determining a first equation of a coefficient to be determined for a variation function of the freezing temperature in the freezer compartment according to equation (1),
（1）
Wherein,For the first temperature change data in the period between the ith time and the (i+1) th time of the current control cycle,/>For the refrigeration power,/>For the time interval between adjacent moments,/>And/>A first coefficient to be determined which is a first coefficient to be determined equation; and solving the first coefficient to be determined according to the first temperature change data, the refrigeration power and the time interval between adjacent moments to obtain a solution value of the first coefficient to be determined. And obtaining the freezing temperature change function according to the solution value of the first coefficient to be determined and the first coefficient to be determined equation.
According to an embodiment of the present invention, in formula (1),Is the cooling power in the current period, therefore,/>The refrigeration power multiplied by the time interval between adjacent time instants may represent the energy consumed by the refrigeration unit in the time interval between adjacent time instants, which energy is positively correlated to the amount of refrigeration generated by the refrigeration unit and also to the magnitude of the temperature change in the time interval between adjacent time instants. /(I)The constant term is expressed as a residual term in the temperature change data. Thus, the known amount/>, of the current control period can be based on、/>Constructing a first coefficient equation to determine/>And/>The solution value of the first coefficient to be determined is obtained, and then the freezing temperature change function is obtained according to the solution value of the first coefficient to be determined.
By the method, a first coefficient equation can be set according to the relation between the energy consumed by the refrigerating unit between adjacent moments and the temperature drop amplitude in the refrigerating chamber, the first coefficient in the first coefficient equation is solved based on the first temperature data and the refrigerating power in the current control period, a refrigerating temperature change function capable of accurately describing the relation between the temperature change in the refrigerating chamber and the refrigerating power is obtained, an accurate data basis is provided for controlling the temperature and the working state of the double-temperature cabinet, and the timeliness and the accuracy of temperature control are improved.
According to an embodiment of the present invention, in step S104, a refrigerating temperature variation function within the refrigerating compartment may be used to describe the relationship between the temperature variation within the refrigerating compartment and the refrigerating and heating powers. Determining a refrigeration temperature variation function in the refrigeration chamber according to the first temperature data, the second temperature data and the heating power, wherein the method comprises the following steps: determining second temperature change data in a time period between a plurality of adjacent moments in the current control period according to the second temperature data of the moments in the current control period; and determining a refrigerating temperature change function in the refrigerating chamber according to the second temperature data, the second temperature change data, the first temperature data and the heating power.
According to the embodiment of the invention, for example, the current control period is five minutes, the time interval between every two moments is ten seconds, the second temperature data of 30 moments can be obtained, and further the second temperature change data of 29 adjacent moments can be obtained, further, the larger the heating power is, the higher the rising rate of the temperature of the refrigerating chamber is, that is, the larger the rising amplitude of the temperature in the time interval between the adjacent moments is, the larger the difference between the second temperature data and the first temperature data is, that is, the larger the temperature difference between the refrigerating chamber and the refrigerating chamber is, the faster the heat conduction rate between the refrigerating chamber and the refrigerating chamber is, the faster the temperature of the refrigerating chamber is reduced, that is, the larger the cooling amplitude in the time interval between the adjacent moments is, the temperature change in the refrigerating chamber is affected, therefore, the two conditions are needed to be fully considered, and the refrigerating temperature change function in the refrigerating chamber is determined according to the second temperature data, the second temperature change data, the first temperature data and the heating power.
According to an embodiment of the present invention, determining a refrigeration temperature variation function in a refrigeration compartment from the second temperature data, the second temperature variation data, the first temperature data, and the heating power includes: determining a second equation of coefficients to be determined for the refrigeration temperature variation function within the refrigeration compartment according to equation (2),
（2）
Wherein,For the second temperature change data in the period between the ith time and the (i+1) th time of the current control cycle,/>For the heating power,/>Second temperature data for the i-th instant of the current control cycle,/>Second temperature data for the (i+1) th time of the current control cycle,/>First temperature data for the i-th instant of the current control cycle,/>First temperature data at (i+1) th time of current control cycle,/>For the time interval between adjacent moments,/>、/>And/>A second coefficient of uncertainty of a second coefficient of uncertainty equation; solving the second undetermined coefficient according to the second temperature data, the second temperature change data, the first temperature data, the heating power and the time interval to obtain a solution value of the second undetermined coefficient; and obtaining a refrigeration temperature change function according to the solved value of the second undetermined coefficient and the second undetermined coefficient equation.
In accordance with an embodiment of the present invention,Is the heating power of the heating wire,/>The energy consumed by the heating wire in the time interval of the adjacent time is positively correlated with the heat generated by the heating wire, and the temperature rise in the refrigerating chamber in the time interval of the adjacent time is positively correlated with the temperature rise. /(I)The average value of the second temperature data at the i-th time and the i+1-th time can be represented as the average value of the temperatures in the refrigerating chamber in the time interval between the i-th time and the i+1-th time, and the same applies to the average value of the temperatures in the refrigerating chamberCan represent the average value of the temperature in the refrigerating chamber in the time interval between the ith moment and the (i+1) th momentIt may be expressed that in the time interval between the i-th time and the i+1-th time, the larger the average temperature difference between the refrigerating chamber and the freezing chamber, the faster the refrigerating chamber temperature drops, i.e., the average temperature difference is inversely related to the temperature rising amplitude in the refrigerating chamber in the time interval of the adjacent time. /(I)Can be used to indicate the effect of temperature drop in the refrigerated compartment due to heat transfer effects in the freezer compartment, which is inversely related to the magnitude of the increase in temperature in the refrigerated compartment. In conclusion,/>That is, the influence of the above two factors on the second temperature change data in the time interval between adjacent moments can be expressedIs a constant term. Therefore, from the second temperature data, the second temperature change data, the first temperature data, the heating power and the time interval, a second coefficient equation to be determined can be constructed, thereby determining/>、/>And/>The solution value of the second coefficient to be determined, and then the refrigeration temperature change function is obtained according to the solution value of the second coefficient to be determined.
In this way, the second coefficient equation is set according to the relationship between the energy consumed by the heating power of the heating wire between adjacent moments and the temperature rise amplitude in the refrigerating chamber, and the relationship between the temperature difference between the refrigerating chamber and the freezing chamber and the temperature rise amplitude in the refrigerating chamber, and then the refrigerating temperature change function for describing the relationship between the temperature change in the refrigerating chamber and the refrigerating power and the heating power is determined by solving the second coefficient in the second coefficient equation. Comprehensively considering the influence of the heating power of the heating wire and the temperature difference between the refrigerating chamber and the freezing chamber, objectively reflecting the law of temperature change in the refrigerating chamber and providing a data basis for the setting of the heating power of the heating wire.
According to an embodiment of the present invention, in step S105, a first set temperature in the freezer compartment and a second set temperature in the refrigerator compartment are obtained. The first set temperature and the second set temperature are preset target temperatures of a preset freezing chamber or a preset refrigerating chamber, for example, the second set temperature of the refrigerating chamber is 3 ℃, the first set temperature of the freezing chamber is-15 ℃, and specific numerical values of the first set temperature and the second set temperature are not limited.
According to an embodiment of the present invention, in step S106, determining a predicted cooling power for a next control period according to the freezing temperature variation function, the first temperature data, and a first set temperature in the freezing chamber, includes: determining first temperature data at the last moment in the current control period; if the following formula (3) holds, the predicted cooling power of the next control cycle is set to the maximum cooling power of the double temperature cabinet,
（3）
Wherein,For the maximum refrigerating power of the double-temperature cabinet,/>For the first set temperature,/>For the first temperature data of the last moment in the current control period, n is the moment number in the current control period,/>For/>Solution value of/>For/>Is a solution to (a); otherwise, determining the predicted refrigeration power/>, of the next control period according to the formula (4)。
（4）
According to an embodiment of the present invention, in formula (3),Data representing the total temperature change in the freezer compartment for one control cycle operating at maximum cooling power,/>For the difference between the first temperature data at the last time in the current control period and the first set temperature, for example, the first set temperature is-20 ℃, and the first temperature data at the last time in the current control period is-10 ℃,/>At-10deg.C, therefore, the practical meaning of equation (3) is that the total temperature change in the freezer compartment is less than or equal to/>, with one control cycle operating at maximum refrigeration powerThat is, even if the operation is performed at the maximum cooling power for one control cycle, the temperature of the freezing chamber cannot be brought to the first set temperature, and in this case, the maximum cooling power of the double-temperature cabinet is directly set to the predicted cooling power to bring the temperature of the freezing chamber to the first set temperature as soon as possible. If equation (3) is not true, the predicted cooling power for the next control period can be determined by equation (4), i.e., the first set temperature is determined as the temperature in the freezer compartment at the end of the next control period, and the temperature drop amplitude is solved for/>, based on the law between the cooling power determined by the freezing temperature variation function and the temperature drop amplitudeAnd (4) the required refrigeration power is the predicted refrigeration power of the next control period determined by the formula (4).
In this way, the data of the total temperature change of the double-temperature cabinet working at the maximum refrigeration power in the current control period can be determined, and compared with the difference value between the first set temperature and the first temperature data at the last moment in the current control period, if the double-temperature cabinet cannot reach the first set temperature in the current control period at the maximum refrigeration power, the predicted refrigeration power is set as the maximum refrigeration power of the double-temperature cabinet so as to improve the refrigeration efficiency of the freezing chamber, otherwise, the predicted refrigeration power can be determined based on the rule described by the refrigeration temperature change function, the refrigeration efficiency of the freezing chamber can be improved, and the accuracy of temperature control is improved.
According to an embodiment of the present invention, in step S107, determining a predicted heating power for a next control period according to the predicted cooling power, the freezing temperature variation function, the refrigerating temperature variation function, the first temperature data, the second temperature data, and the second set temperature, includes: determining first temperature data at the last moment in the current control period; determining first predicted temperature data in the refrigerating chamber at a plurality of moments of the next control period according to the first temperature data at the last moment in the current control period, the refrigerating temperature change function and the predicted refrigerating power; determining second temperature data at the last moment in the current control period; determining the undetermined heating power of the next control period according to the first predicted temperature data, the second temperature data of the last moment in the current control period, the refrigerating temperature change function and the second set temperature; if the undetermined heating power is smaller than or equal to the maximum heating power of the heating wire, determining the undetermined heating power as the predicted heating power; otherwise, determining the maximum heating power as the predicted heating power.
According to the embodiment of the invention, the first predicted temperature data in the refrigerating chamber at a plurality of moments of the next control period can be determined according to the first temperature data at the last moment in the current control period, the refrigerating temperature change function and the predicted refrigerating power, for example, the temperature change amplitude between adjacent moments can be determined, the first temperature data at the last moment in the current control period can be used as the first predicted temperature data at the first moment in the next control period, the first predicted temperature data at the second moment can be obtained by combining the first temperature data at the first moment and the temperature change amplitude, the first predicted temperature data at the third moment can be obtained based on the temperature change amplitude and the first predicted temperature data at the second moment, and the first predicted temperature data in the refrigerating chamber at a plurality of moments of the next control period can be obtained by analogy.
According to an embodiment of the present invention, the second temperature data at the last moment in the current control period may be determined, and the predicted heating power may be determined according to formula (5), if the pending heating power is less than or equal to the maximum heating power of the heating wire, otherwise, the maximum heating power may be determined as the predicted heating power.
According to an embodiment of the present invention, determining the predicted heating power of the next control period according to the first predicted temperature data, the second temperature data at the last time in the current control period, the refrigerating temperature change function, and the second set temperature includes: determining the pending heating power for the next control period according to equation (5)，
（5）
Wherein,For the second set temperature,/>For the second temperature data of the last moment in the current control period, n is the moment number in the current control period,/>For the first predicted temperature data at the i-th instant of the next control cycle,/>For the first predicted temperature data at time i+1st of the next control cycle,/>For/>Is used to solve the problem of the (c) for the (c),For/>Solution value of/>For/>I is less than or equal to n-1, and i and n are positive integers.
According to the embodiment of the invention, the second temperature data at the last moment in the current control period is taken as the second predicted temperature data at the first moment in the next control period, and the second predicted temperature data is obtained according to the refrigerating temperature change functionWherein/>For the second predicted temperature data at time 2 of the next control cycle,/>First predicted temperature data at the 2 nd time of the next control cycle. Similarly, the predicted temperature change in the refrigeration compartment at the second and third times of the next control cycle can be expressed as/>Wherein/>For the second predicted temperature data at time 3 of the next control cycle,/>First predicted temperature data for the 3 rd time of the next control cycle. By analogy, the second predicted temperature data of the last time of the next control period is taken as the second set temperature, and the predicted change amplitude in the refrigerating chamber at the last time and the previous time can be expressed asWherein/>For the second predicted temperature data at time n-1 of the next control cycle,/>For the first predicted temperature data at time n-1 of the next control cycle,/>First predicted temperature data for the nth time of the next control cycle. Further, the formula constructed by the predicted temperature change amplitude between adjacent moments in the refrigerating chamber is accumulated to obtainWherein, the method comprises the steps of, wherein,The sum of the average temperatures in the time interval representing each adjacent moment in the refrigerating chamber is also equal to n-1 times the average temperature in the refrigerating chamber in the next control period, namely/>. On the other hand, the first predicted temperature data in the next control period is a known amount determined based on the freezing temperature variation function and the first temperature data at the last time in the current control period, and thereforeCan be directly expressed as/>. Based on the above analysis, the above accumulated formula can be rewritten as/>And then the equation (5) can be obtained, namely the undetermined heating power/>, of the next control period can be determined。
In this way, the first predicted temperature data at each moment of the next control period can be determined based on the freezing temperature change function, and then the predicted temperature change amplitude between adjacent moments in the refrigerating chamber is determined based on the refrigerating temperature change function in a time period-by-time period, so that the undetermined heating power of the next control period is determined, the control accuracy of the heating power of the heating wire is improved, the control accuracy of the temperature of the refrigerating chamber is improved through the auxiliary temperature control of the heating wire, the temperature of the refrigerating chamber can be kept near the second set temperature, the possibility of icing, frosting and other conditions is reduced, and the double-temperature cabinet is more intelligent and stable.
According to an embodiment of the present invention, if the above-obtained pending heating power is less than or equal to the maximum heating power of the heating wire, the pending heating power is determined as the predicted heating power. Otherwise, if the pending heating power exceeds the maximum heating power of the heating wire, the maximum heating power may be determined as the predicted heating power in order to meet the temperature control requirement in the refrigerating compartment as much as possible.
According to an embodiment of the present invention, in step S108, at the beginning of the next control period, the cooling power is set to the predicted cooling power, and the heating power is set to the predicted heating power. So that the temperature in the freezer compartment reaches the first set temperature as soon as possible and the temperature in the refrigerator compartment is kept at the second set temperature.
According to the refrigerating chamber and freezing chamber double-temperature cabinet control method provided by the embodiment of the invention, the temperature in the refrigerating chamber can be controlled by utilizing the cold capacity of the freezing chamber and the heating wire in the refrigerating chamber, so that the temperature control precision in the refrigerating chamber is improved, the possibility of icing, frosting and other conditions is reduced, and the workload of manual cleaning is reduced. The predicted refrigerating power and the predicted heating power of the next control period can be determined, so that the temperatures in the freezing chamber and the refrigerating chamber of the double-temperature cabinet can be accurately controlled in each control period, and the accuracy of temperature control of the double-temperature cabinet is improved. When the freezing temperature change function is determined, a first coefficient equation can be set according to the relation between the energy consumed by the refrigerating unit between adjacent moments and the temperature drop amplitude in the refrigerating chamber, and the first coefficient in the first coefficient equation is solved based on the first temperature data and the refrigerating power in the current control period, so that the freezing temperature change function capable of accurately describing the relation between the temperature change in the refrigerating chamber and the refrigerating power is obtained, an accurate data basis is provided for controlling the temperature regulation and the working state of the double-temperature cabinet, and the timeliness and the accuracy of temperature control are improved. When determining the refrigeration temperature change function, a second coefficient equation is set according to the relation between the energy consumed by the heating power of the heating wire between adjacent moments and the temperature rise amplitude in the refrigeration chamber and the relation between the temperature difference between the refrigeration chamber and the freezing chamber and the temperature rise amplitude in the refrigeration chamber, and then the refrigeration temperature change function for describing the relation between the temperature change in the refrigeration chamber and the refrigeration power and the heating power is determined by solving the second coefficient in the second coefficient equation. Comprehensively considering the influence of the heating power of the heating wire and the temperature difference between the refrigerating chamber and the freezing chamber, objectively reflecting the law of temperature change in the refrigerating chamber and providing a data basis for the setting of the heating power of the heating wire. When the predicted refrigerating power is determined, the data of the total temperature change of the double-temperature cabinet working at the maximum refrigerating power in the current control period can be determined, and compared with the difference value between the first set temperature and the first temperature data at the last moment in the current control period, if the double-temperature cabinet cannot reach the first set temperature in the current control period at the maximum refrigerating power, the predicted refrigerating power is set to be the maximum refrigerating power of the double-temperature cabinet so as to improve the refrigerating efficiency of the freezing chamber, otherwise, the predicted refrigerating power can be determined based on the rule described by the refrigerating temperature change function, the refrigerating efficiency of the freezing chamber can be improved, and the accuracy of temperature control is improved. When the undetermined heating power is determined, the first predicted temperature data of each moment of the next control period can be determined based on the freezing temperature change function, and then the predicted temperature change amplitude between adjacent moments in the refrigerating chamber is determined based on the refrigerating temperature change function in a time section-by-time section, so that the undetermined heating power of the next control period is determined, the control accuracy of the heating power of the heating wire is improved, the control accuracy of the temperature of the refrigerating chamber is improved through the auxiliary temperature control of the heating wire, the temperature of the refrigerating chamber can be kept near the second set temperature, the possibility of icing, frosting and other conditions is reduced, and the double-temperature cabinet is more intelligent and stable.
Fig. 2 schematically illustrates a schematic diagram of a refrigerator and freezer double-freezer control system according to an embodiment of the present invention, the system comprising:
The first data acquisition module acquires first temperature data in a refrigerating chamber and second temperature data in the refrigerating chamber in the double-temperature cabinet at a plurality of moments of a current control period;
The first power determining module is used for determining the heating power of the heating wire in the refrigerating chamber and the refrigerating power of the double-temperature cabinet in the current control period, wherein the heating wire is arranged on the liner of the refrigerating chamber and used for increasing the temperature in the refrigerating chamber when the power is on;
a first function determining module for determining a freezing temperature change function in the freezing chamber according to the first temperature data and the refrigerating power;
A second function determining module for determining a refrigeration temperature change function in the refrigeration chamber according to the first temperature data, the second temperature data and the heating power;
the set temperature determining module is used for obtaining a first set temperature in the refrigerating chamber and a second set temperature in the refrigerating chamber;
The second power determining module is used for determining the predicted refrigeration power of the next control period according to the refrigeration temperature change function, the first temperature data and the first set temperature in the refrigeration chamber;
A third power determining module for determining a predicted heating power of a next control period according to the predicted cooling power, the freezing temperature change function, the refrigerating temperature change function, the first temperature data, the second temperature data, and the second set temperature;
And the power setting module is used for setting the refrigeration power to be the predicted refrigeration power and setting the heating power to be the predicted heating power when the next control period starts.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are by way of example only and are not limiting. The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the examples and embodiments of the invention may be modified or practiced without departing from the principles described.
Claims (9)
1. A control method of a double-temperature cabinet of a refrigerating chamber and a freezing chamber is characterized by comprising the following steps:
acquiring first temperature data in a refrigerating chamber and second temperature data in a refrigerating chamber in a double-temperature cabinet at a plurality of moments of a current control period;
determining the heating power of the heating wire in the refrigerating chamber and the refrigerating power of the double-temperature cabinet in the current control period, wherein the heating wire is arranged on the liner of the refrigerating chamber and used for increasing the temperature in the refrigerating chamber when the power is on;
Determining a freezing temperature change function in a freezing chamber according to the first temperature data and the refrigerating power;
determining a refrigeration temperature change function in the refrigeration chamber according to the first temperature data, the second temperature data and the heating power;
Acquiring a first set temperature in the refrigerating chamber and a second set temperature in the refrigerating chamber;
Determining the predicted refrigeration power of the next control period according to the refrigeration temperature change function, the first temperature data and the first set temperature in the refrigeration chamber;
determining a predicted heating power of a next control period according to the predicted cooling power, the freezing temperature change function, the refrigerating temperature change function, the first temperature data, the second temperature data and the second set temperature;
at the beginning of the next control period, the cooling power is set to the predicted cooling power, and the heating power is set to the predicted heating power.
2. The method of claim 1, wherein determining a freezing temperature variation function in the freezer compartment based on the first temperature data and the cooling power comprises:
determining first temperature change data in a time period between a plurality of adjacent moments in a current control period according to first temperature data of the moments in the current control period;
And determining a freezing temperature change function in the freezing chamber according to the first temperature change data and the refrigerating power.
3. The method of claim 2, wherein determining a freezing temperature variation function in the freezer compartment based on the first temperature variation data and the cooling power, comprises:
According to the formula
，
A first equation of coefficients to be determined for a function of a variation in the freezing temperature within the freezer compartment is determined, wherein,For the first temperature change data in the period between the ith time and the (i+1) th time of the current control cycle,/>For the refrigeration power,/>For the time interval between adjacent moments,/>And/>A first coefficient to be determined which is a first coefficient to be determined equation;
according to the first temperature change data, the refrigeration power and the time interval between adjacent moments, solving a first coefficient to be determined to obtain a solution value of the first coefficient to be determined;
And obtaining the freezing temperature change function according to the solution value of the first coefficient to be determined and the first coefficient to be determined equation.
4. The method of claim 1, wherein determining a refrigeration temperature variation function in the refrigeration compartment based on the first temperature data, the second temperature data, and the heating power, comprises:
Determining second temperature change data in a time period between a plurality of adjacent moments in the current control period according to the second temperature data of the moments in the current control period;
and determining a refrigerating temperature change function in the refrigerating chamber according to the second temperature data, the second temperature change data, the first temperature data and the heating power.
5. The method of claim 4, wherein determining a refrigeration temperature variation function in the refrigeration compartment based on the second temperature data, the second temperature variation data, the first temperature data, and the heating power, comprises:
According to the formula
，
A second equation of coefficients to be determined for the refrigeration temperature variation function within the refrigeration compartment is determined, wherein,For the second temperature change data in the period between the ith time and the (i+1) th time of the current control cycle,/>For the heating power,/>Second temperature data for the i-th instant of the current control cycle,/>Second temperature data for the (i+1) th time of the current control cycle,/>First temperature data for the i-th instant of the current control cycle,/>First temperature data at (i+1) th time of current control cycle,/>For the time interval between adjacent moments,/>、/>And/>A second coefficient of uncertainty of a second coefficient of uncertainty equation;
Solving the second undetermined coefficient according to the second temperature data, the second temperature change data, the first temperature data, the heating power and the time interval to obtain a solution value of the second undetermined coefficient;
and obtaining a refrigeration temperature change function according to the solved value of the second undetermined coefficient and the second undetermined coefficient equation.
6. The method of claim 3, wherein determining the predicted cooling power for the next control cycle based on the freezing temperature variation function, the first temperature data, and the first set temperature in the freezer compartment, comprises:
Determining first temperature data at the last moment in the current control period;
If it is Setting the predicted refrigeration power of the next control period as the maximum refrigeration power of the double-temperature cabinet, wherein/>For the maximum refrigerating power of the double-temperature cabinet,/>For the first set temperature,/>For the first temperature data of the last moment in the current control period, n is the moment number in the current control period,/>For/>Solution value of/>For/>Is a solution to (a);
Otherwise, according to the formula Determining predicted refrigeration power/>, for next control period。
7. The method of claim 5, wherein determining the predicted heating power for the next control cycle based on the predicted cooling power, the freezing temperature change function, the refrigerating temperature change function, the first temperature data, the second temperature data, and the second set temperature, comprises:
Determining first temperature data at the last moment in the current control period;
determining first predicted temperature data in the refrigerating chamber at a plurality of moments of the next control period according to the first temperature data at the last moment in the current control period, the refrigerating temperature change function and the predicted refrigerating power;
Determining second temperature data at the last moment in the current control period;
Determining the undetermined heating power of the next control period according to the first predicted temperature data, the second temperature data of the last moment in the current control period, the refrigerating temperature change function and the second set temperature;
if the undetermined heating power is smaller than or equal to the maximum heating power of the heating wire, determining the undetermined heating power as the predicted heating power;
Otherwise, determining the maximum heating power as the predicted heating power.
8. The method of claim 7, wherein determining the predicted heating power for the next control cycle based on the first predicted temperature data, the second temperature data at the last time in the current control cycle, the refrigeration temperature variation function, and the second set temperature, comprises:
According to the formula
，
Determining pending heating power for next control periodWherein/>For the second set temperature,/>For the second temperature data of the last moment in the current control period, n is the moment number in the current control period,/>For the first predicted temperature data at the i-th instant of the next control cycle,/>For the first predicted temperature data at time i+1st of the next control cycle,/>For/>Solution value of/>For/>Solution value of/>For/>I is less than or equal to n-1, and i and n are positive integers.
9. A dual-temperature cabinet control system for a refrigerator and a freezer, comprising:
The first data acquisition module acquires first temperature data in a refrigerating chamber and second temperature data in the refrigerating chamber in the double-temperature cabinet at a plurality of moments of a current control period;
The first power determining module is used for determining the heating power of the heating wire in the refrigerating chamber and the refrigerating power of the double-temperature cabinet in the current control period, wherein the heating wire is arranged on the liner of the refrigerating chamber and used for increasing the temperature in the refrigerating chamber when the power is on;
a first function determining module for determining a freezing temperature change function in the freezing chamber according to the first temperature data and the refrigerating power;
A second function determining module for determining a refrigeration temperature change function in the refrigeration chamber according to the first temperature data, the second temperature data and the heating power;
the set temperature determining module is used for obtaining a first set temperature in the refrigerating chamber and a second set temperature in the refrigerating chamber;
The second power determining module is used for determining the predicted refrigeration power of the next control period according to the refrigeration temperature change function, the first temperature data and the first set temperature in the refrigeration chamber;
A third power determining module for determining a predicted heating power of a next control period according to the predicted cooling power, the freezing temperature change function, the refrigerating temperature change function, the first temperature data, the second temperature data, and the second set temperature;
And the power setting module is used for setting the refrigeration power to be the predicted refrigeration power and setting the heating power to be the predicted heating power when the next control period starts.
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