A control method, device and equipment for online temperature control of multiple cooling fans

Abstract

The present invention discloses a control method, device and equipment for online temperature control of multiple air coolers. The control method for online temperature control of multiple air coolers includes: when the sum of the current PID cooling power of each air cooler is greater than the maximum power threshold; taking the maximum value of the minimum cooling time of each air cooler as the benchmark cooling time; using the cooling power of multiple first air coolers to reduce the temperature in the corresponding cold storage to the corresponding target temperature according to the benchmark cooling time as the current cooling power; the remaining air coolers all use the corresponding current PID cooling power as the current cooling power; the number of first air coolers is the minimum number that makes the sum of all current cooling powers less than the maximum power threshold. In this application, when the total cooling power of the air coolers is too large, only some of the air coolers are operated at reduced power, so as to ensure the overall cooling speed of each cold storage, realize more reasonable and refined regulation and control of the cooling power of each air cooler, and improve the temperature control effect of the cold storage temperature control.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration temperature control of air coolers, and in particular to a control method, device and equipment for online temperature control of multiple air coolers. Background Art

[0002] In a refrigeration system with a large number of cold storage units, each is equipped with its own air cooler for cooling. These air coolers typically operate in tandem, sharing the same refrigeration unit. This means that the cooling capacity of each air cooler comes from the same refrigeration unit. Because each cold storage unit has different temperature requirements, the types and quantities of goods stored within, and the size of each cold storage unit, each air cooler uses independent PID feedback to adjust its cooling power based on the temperature of the corresponding cold storage unit and the target temperature.

[0003] However, the cooling power that a refrigeration unit can handle during operation is limited. Once the combined cooling power of each air cooler exceeds the unit's capacity, the air coolers must be controlled to operate at reduced power to ensure the proper functioning of the entire refrigeration system. However, the current method of controlling the reduced power operation of each air cooler has, to a certain extent, affected the air cooler's cooling effect on the cold storage. Summary of the Invention

[0004] The purpose of the present invention is to provide a control method, device and equipment for online temperature control of multiple air coolers, which can improve the rationality of temperature control of each air cooler to a certain extent, thereby improving the refrigeration effect of each cold storage.

[0005] To solve the above technical problems, the present invention provides a control method for online temperature control of multiple cooling fans, comprising:

[0006] According to the current temperature and target temperature of the cold storage corresponding to each air cooler, a PID feedback adjustment operation is performed to obtain the current PID cooling power of each air cooler; and the current PID cooling powers of all the air coolers are summed to obtain the current total cooling power;

[0007] Determining whether the current total cooling power is greater than a maximum power threshold;

[0008] If so, determining the minimum cooling time required for each of the air coolers to reduce the temperature in the corresponding cold storage to the corresponding target temperature according to the corresponding maximum cooling power; and taking the maximum value of each of the minimum cooling time as the benchmark cooling time;

[0009] Determine a plurality of first air coolers among the air coolers, and use the cooling power of each first air cooler that reduces the temperature in the corresponding cold storage to the corresponding target temperature according to the benchmark cooling time as the current cooling power of the first air cooler; and each air cooler other than the first air cooler uses the corresponding current PID cooling power as the current cooling power;

[0010] The number of the first air coolers is the minimum number of air coolers required to ensure that the total current cooling power corresponding to all the air coolers is less than the maximum power threshold.

[0011] Optionally, a plurality of first air coolers are determined in each of the air coolers, including:

[0012] The air cooler with the largest minimum cooling time among the air coolers is used as the first air cooler;

[0013] The minimum cooling time corresponding to each of the air coolers except the first first air cooler is sorted according to size, and multiple air coolers with the smallest corresponding minimum cooling time are determined as the multiple first air coolers except the first first air cooler.

[0014] Optionally, determining the minimum cooling time required for each of the air coolers to reduce the temperature in the corresponding cold storage to the corresponding target temperature according to the corresponding maximum cooling power includes:

[0015] According to the current temperature and target temperature of the cold storage corresponding to each air cooler, according to the cooling capacity formula Q=(T-To)*[CρVE+C 气 ρ 气 V(1-E)], determine the cooling capacity of each air cooler to reduce the temperature in the corresponding cold storage to the target temperature; where Q is the cooling capacity, T is the current temperature, To is the target temperature, C is the specific heat capacity of the fresh food in the cold storage, ρ is the density of the fresh food in the cold storage, V is the volume of the cold storage, E is the utilization rate of the cold storage, C 气 is the specific heat capacity of the air in the cold storage, ρ 气 is the air density in the cold storage;

[0016] According to the maximum cooling power and cooling capacity of each air cooler, the minimum cooling time formula t=Q / (W max -W n ), determine the minimum cooling time corresponding to each of the air coolers; where t is the minimum cooling time, W max is the maximum cooling power, W n is the heat leakage power of the cold storage.

[0017] Optionally, taking the cooling power of each first air cooler that reduces the temperature in the corresponding cold storage to the corresponding target temperature according to the benchmark cooling time as the current cooling power of the first air cooler includes:

[0018] According to the refrigeration formula Q1=Q / t0+W n , determine the current cooling power of each of the first air coolers; wherein Q1 is the current cooling power of each of the first air coolers, Q is the cooling capacity corresponding to the first air cooler, t0 is the reference cooling time, W n is the heat leakage power of the cold storage.

[0019] Optionally, when the current total cooling power is less than the maximum power threshold, determining whether the current total cooling power is less than a minimum power threshold;

[0020] If so, multiple second air coolers are determined from each of the air coolers, and the maximum cooling power corresponding to each of the second air coolers is used as the current cooling power of the second air cooler, and the air coolers other than the second air cooler in each of the air coolers use the corresponding current PID cooling power as the current cooling power;

[0021] The number of the second air coolers is the minimum number of air coolers required to ensure that the total current cooling power corresponding to all the air coolers is greater than the minimum power threshold.

[0022] Optionally, a plurality of second air coolers are determined in each of the air coolers, including:

[0023] The air cooler with the largest minimum cooling time among the air coolers is used as the first and the second air coolers;

[0024] Among the air coolers except the first one of the second air coolers, a plurality of air coolers with the largest corresponding minimum cooling time are determined as the plurality of second air coolers except the first one of the second air coolers.

[0025] Optionally, if the number of cold storages currently requiring refrigeration is greater than or equal to 1 and less than a set number threshold, and the sum of the current PID cooling powers of the third air coolers corresponding to the cold storages currently requiring refrigeration is less than the minimum power threshold, then a plurality of accompanying air coolers are selected from the air coolers other than the third air cooler for operation;

[0026] Controlling each of the third air coolers to operate at a corresponding maximum cooling power as a current cooling power;

[0027] According to the corresponding maximum cooling power and the minimum power threshold of each third cooling air machine and the power formula Q2=(W1-m*W max ) / n, determine the current cooling power of each of the accompanying running air coolers; wherein Q2 is the current cooling power of the accompanying running air cooler, W1 is the minimum power threshold, W max is the maximum cooling power, m is the number of the third air coolers, and n is the number of the accompanying air coolers;

[0028] Each of the accompanying air coolers is controlled to operate at the corresponding current cooling power, and a defrost heater of each of the accompanying air coolers is controlled to start.

[0029] Optionally, it also includes:

[0030] According to the minimum shutdown time of the refrigeration unit commonly connected to each of the air coolers after it is shut down and restarted, and the correlation formula t2=(T n -T max )[CρVE+C 气 ρ 气 V(1-E)] / W n , determining the maximum refrigeration shutdown temperature corresponding to each of the cold storages when the heating time of the cold storage is greater than the minimum shutdown time;

[0031] Among them, the heating time is the time required for the temperature in each cold storage to rise from the refrigeration shutdown temperature to the maximum allowable temperature; the association relationship is the relationship between the heating time corresponding to each cold storage and the corresponding refrigeration shutdown temperature; t2 is the heating time, T n is the refrigeration shutdown temperature, T max is the maximum allowable temperature corresponding to the cold storage;

[0032] When the current temperature corresponding to each of the cold storages is lower than the maximum refrigeration shutdown temperature, the refrigeration unit is controlled to shut down.

[0033] A control device for online temperature control of multiple cooling fans, comprising:

[0034] The first calculation module is used to perform a PID feedback adjustment operation based on the current temperature and target temperature of the cold storage corresponding to each air cooler to obtain the current PID cooling power of each air cooler; and to sum the current PID cooling powers of all the air coolers to obtain the current total cooling power;

[0035] A second operation module is used to determine whether the current total cooling power is greater than a maximum power threshold;

[0036] a third operation module, configured to determine, if the current total cooling power is greater than the maximum power threshold, the minimum cooling time required for each of the air coolers to reduce the temperature in the corresponding cold storage to the corresponding target temperature according to the corresponding maximum cooling power; and use the maximum value of each of the minimum cooling time as the benchmark cooling time;

[0037] a fourth operation module, configured to determine a plurality of first air coolers among the air coolers, and use the cooling power of each first air cooler required to reduce the temperature in the corresponding cold storage to the target temperature according to the benchmark cooling time as the current cooling power of the first air cooler; and each air cooler other than the first air cooler uses the corresponding current PID cooling power as the current cooling power;

[0038] The number of the first air coolers is the minimum number of air coolers required to ensure that the total current cooling power corresponding to all the air coolers is less than the maximum power threshold.

[0039] A control device for online temperature control of multiple cooling fans, comprising:

[0040] memory for storing computer programs;

[0041] A processor is used to implement the steps of the control method for online temperature control of multiple cooling fans as described in any of the above items when executing the computer program.

[0042] The present invention provides a control method, device and equipment for online temperature control of multiple cooling air machines. The control method for online temperature control of multiple cooling air machines includes: performing PID feedback adjustment operation according to the current temperature and target temperature of the cold storage corresponding to each cooling air machine to obtain the current PID cooling power of each cooling air machine; and summing the current PID cooling power of all cooling air machines to obtain the current total cooling power; judging whether the current total cooling power is greater than the maximum power threshold; if so, determining that each cooling air machine reduces the temperature in the corresponding cold storage to the corresponding target temperature according to the corresponding maximum cooling power. The minimum cooling time required for the temperature; and the maximum value of each minimum cooling time is used as the benchmark cooling time; multiple first air coolers are determined in each air cooler, and the cooling power of each first air cooler that reduces the temperature in the corresponding cold storage to the corresponding target temperature according to the benchmark cooling time is used as the current cooling power of the first air cooler; and the air coolers except the first air cooler in each air cooler use the corresponding current PID cooling power as the current cooling power; wherein, the number of first air coolers is the minimum number of units that makes the sum of the current cooling powers corresponding to all air coolers less than the maximum power threshold.

[0043] In the present application, in the process of using interconnected air coolers to control the temperature of each cold storage, when the sum of the current PID cooling powers of each air cooler is greater than the maximum power threshold, that is, when the sum of the current PID cooling powers of each air cooler exceeds the normal operating range of the refrigeration unit, the minimum cooling time with the largest value among the minimum cooling times required for each air cooler to reduce the temperature in the corresponding cold storage to the corresponding target temperature according to the corresponding maximum cooling power is used as the benchmark cooling time, and multiple first air coolers are selected from each air cooler for reduced power operation, and the current cooling power of each first air cooler is the cooling power of the first air cooler to reduce the temperature in the corresponding cold storage to the corresponding target temperature according to the benchmark cooling time. Therefore, on the basis of avoiding the extension of the overall cooling time of each air cooler, the sum of the current cooling powers of all air coolers is controlled to be less than the maximum power threshold, thereby ensuring the normal operation of the entire refrigeration system.

[0044] It can be seen from this that in the present application, in the refrigeration control process involving online temperature control of multiple air coolers, when the total refrigeration power of each air cooler is too large, the refrigeration power of all air coolers is not directly and uniformly reduced. Instead, some of the air coolers are selected to operate at reduced power. On the basis of ensuring the overall refrigeration speed of each cold storage, a more reasonable and refined adjustment and control of the refrigeration power of each air cooler is achieved, which is conducive to improving the temperature control effect of the air cooler on the cold storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0046] Figure 1 A flow chart of a method for controlling temperature of a multi-cooling fan provided in an embodiment of the present application;

[0047] Figure 2 This is a structural block diagram of a control device for online temperature control of multiple cooling fans provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] When multiple air coolers are connected to a single cooling unit and operating online, the cooling unit's real-time cooling capacity is the sum of the cooling capacities of each air cooler. However, the cooling capacity of a cooling unit has a maximum capacity limit. If the total cooling capacity of each air cooler exceeds the maximum capacity limit, the cooling unit will be overloaded, potentially leading to safety accidents. Therefore, it is necessary to limit the total cooling capacity of each air cooler to less than the maximum capacity limit of the cooling unit to ensure the safe operation of the entire cooling system.

[0049] Currently, the real-time cooling power of each air cooler is determined by PID calculation based on the corresponding cold storage temperature and the target temperature. If the total cooling power of each air cooler is greater than the power limit, the cooling power of all air coolers is simply reduced proportionally. Obviously, this method reduces the total cooling power of each air cooler by extending the cooling time. Although this method can ensure the safe operation of the refrigeration system, it also reduces the effectiveness of temperature control in the cold storage to a certain extent.

[0050] To this end, the present application provides a technical solution for temperature control and regulation of multiple air coolers working online, which can improve the rationality of the cooling power regulation of the air coolers to a certain extent, thereby improving the temperature control effect.

[0051] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0052] like Figure 1 As shown, Figure 1 A flow chart of a method for controlling temperature of a multi-cooling fan provided in an embodiment of the present application.

[0053] A control method for online temperature control of multiple cooling fans in the present application may include:

[0054] S11: Perform PID feedback adjustment operation according to the current temperature and target temperature of the cold storage corresponding to each air cooler to obtain the current PID cooling power of each air cooler; and sum the current PID cooling powers of all air coolers to obtain the current total cooling power.

[0055] PID feedback regulation is currently a common automated regulation method. When performing PID feedback regulation calculations, the difference between the current temperature and the target temperature can be substituted into the general PID calculation formula for calculation.

[0056] In addition, in order to avoid the cooling power result determined by the PID operation being greater than the maximum cooling power that the air cooler itself can achieve, the general PID operation formula can be converted into a PID formula of a ratio coefficient, that is, the result of the PID operation is a ratio coefficient with a size in the range of (0, 1), and the product of the ratio coefficient and the maximum cooling power of the air cooler is the current PID cooling power.

[0057] S12: Determine whether the current total cooling power is greater than the maximum power threshold.

[0058] It can be understood that the maximum power threshold is the maximum power of the refrigeration unit during normal operation.

[0059] S13: If the current total cooling power is greater than the maximum power threshold, determine the minimum cooling time required for each air cooler to reduce the temperature in the corresponding cold storage to the corresponding target temperature according to the corresponding maximum cooling power; and use the maximum value of each minimum cooling time as the benchmark cooling time.

[0060] It is understandable that when each air cooler is cooling and cooling each cold storage, it is obvious that each air cooler operates according to its own maximum cooling power, which can enable the temperature in the corresponding cold storage to be reduced to the target temperature in the shortest time. Therefore, for each air cooler, the minimum cooling time to reduce the temperature in its corresponding cold storage to the target temperature is the cooling time required for each air cooler to reduce the temperature in the corresponding cold storage to the corresponding target temperature according to the corresponding maximum cooling power. The maximum value of the minimum cooling time corresponding to each air cooler is the shortest time required for the refrigeration unit to perform cooling work when the temperature of each cold storage is cooled to the target temperature.

[0061] Optionally, in order to ensure the accuracy of the minimum cooling time corresponding to each air cooler, the process of determining the minimum cooling time of each air cooler may include:

[0062] According to the current temperature and target temperature of the cold storage corresponding to each air cooler, according to the cooling capacity formula Q=(T-To)*[CρVE+C 气 ρ 气 V(1-E)], determine the cooling capacity required by each air cooler to reduce the temperature in the corresponding cold storage to the target temperature; where Q is the cooling capacity, T is the current temperature, To is the target temperature, C is the specific heat capacity of the fresh food in the cold storage, ρ is the density of the fresh food in the cold storage, V is the volume of the cold storage, E is the utilization rate of the cold storage, and C 气 is the specific heat capacity of the air in the cold storage, ρ 气 is the air density in the cold storage;

[0063] According to the maximum cooling power and cooling capacity of each air cooler, the minimum cooling time formula t=Q / (W max -W n ), determine the minimum cooling time corresponding to each air cooler; where t is the minimum cooling time, W max is the maximum cooling power, W n is the heat leakage power of the cold storage.

[0064] In this embodiment, the cooling capacity required by the corresponding air cooler is determined based on the heat released in each cold storage from the current temperature to the target temperature; it is further taken into account that each cold storage will continuously leak heat; for this reason, when determining the minimum cooling time, the maximum cooling power of the air cooler and the heat leakage power of the cold storage are differenced, which is equivalent to the actual cooling power of the cold storage, and the ratio of the total cooling capacity and the result of the difference calculation is the minimum cooling time.

[0065] It is understood that each air cooler involved in this embodiment is an air cooler whose corresponding cold storage's current temperature is greater than the target temperature. During the refrigeration control process, when the cold storage's current temperature is less than or equal to the target temperature, the corresponding air cooler can be directly put into a shutdown or standby state. Therefore, each air cooler involved in this embodiment is an air cooler that needs to cool the cold storage, and this will not be repeated later.

[0066] S14: Determine multiple first air coolers among each air cooler, and use the cooling power of each first air cooler that reduces the temperature in the corresponding cold storage to the corresponding target temperature according to the benchmark cooling time as the current cooling power of the first air cooler; and the air coolers except the first air cooler among each air cooler all use the corresponding current PID cooling power as the current cooling power.

[0067] The number of the first air coolers is the minimum number of air coolers required to ensure that the total current cooling power corresponding to all air coolers is less than the maximum power threshold.

[0068] As described above, the maximum value of the minimum cooling time corresponding to each air cooler is the shortest time the refrigeration unit needs to perform cooling work when the temperature of each cold storage is cooled to the target temperature.

[0069] Therefore, when multiple first air coolers in each air cooler are operated at reduced power, the maximum value of each minimum cooling time is used as the benchmark cooling time, and the corresponding cooling power is set as the current cooling power of each first air cooler when the temperature in the corresponding cold storage is cooled to the target temperature according to the benchmark cooling time.

[0070] Optionally, the process of determining the current operating cooling power of each first cooling fan may include:

[0071] According to the refrigeration formula Q1=Q / t0+W n , determine the current cooling power of each first air cooler; where Q1 is the current cooling power of each first air cooler, Q is the cooling capacity corresponding to the first air cooler, t0 is the reference cooling time, W n is the heat leakage power of the cold storage.

[0072] On this basis, the current cooling power of the first air coolers determined in the above manner is equivalent to reducing the power of each first air cooler to a certain extent; and it is ensured that after each first air cooler is reduced in power, the time required to reduce the temperature in the corresponding cold storage to the target temperature does not exceed the reference cooling time. In other words, in this embodiment, reducing the power of some of the air coolers can also ensure that the time required to cool each cold storage to the corresponding target temperature is not prolonged, thereby ensuring the overall temperature control efficiency of each air cooler in cooling the cold storage.

[0073] It is understandable that when the first air coolers are operated at reduced power, the sum of the current cooling powers of the air coolers can be reduced to less than the maximum power threshold, thereby ensuring the safe operation of the entire refrigeration system.

[0074] In addition, the number of first air coolers is the minimum number that makes the sum of the current cooling powers corresponding to all air coolers less than the maximum power threshold, which means that if the number of first air coolers is reduced by one, the sum of the current cooling powers corresponding to all air coolers will be greater than the maximum power threshold.

[0075] Furthermore, there may be multiple ways to select a first air cooler from each air cooler. In an optional embodiment of the present application, the process of determining multiple first air coolers from each air cooler may include:

[0076] The air cooler with the largest minimum cooling time among all the air coolers is selected as the first air cooler;

[0077] The minimum cooling time corresponding to each air cooler except the first first air cooler is sorted according to size, and multiple air coolers with the smallest corresponding minimum cooling time are determined as the multiple first air coolers except the first first air cooler.

[0078] It is understandable that in this embodiment, when determining each first air cooler, the air cooler with the largest minimum cooling time is first selected as the first first air cooler, that is, the air cooler with the smallest cooling time equal to the benchmark cooling time is selected as the first first air cooler, and correspondingly, the current cooling power corresponding to the first first air cooler is also its maximum cooling power. Obviously, the air cooler with the largest minimum cooling time is generally also the one with the longest final cooling time among all the air coolers. In order to improve the cooling speed of the corresponding cold storage by the air cooler, thereby maintaining the balance of the cooling time of each air cooler in the entire refrigeration system, it is avoided that the air cooler with the largest minimum cooling time has low cooling power, resulting in the refrigeration unit providing cooling capacity for a longer time for the air cooler alone.

[0079] On this basis, for each air cooler, even if each air cooler is not running at the maximum cooling power during the actual cooling process, the size of the minimum cooling time can also reflect to a certain extent how fast each air cooler cools the corresponding cold storage to the target temperature. Generally speaking, the smaller the corresponding minimum cooling time, the more likely it is that the air cooler will take the shortest time to cool the cold storage to the target temperature even if it is adjusted in accordance with the PID feedback. For this reason, in the process of preferentially selecting the first air cooler in this embodiment, the air cooler with the shortest corresponding minimum cooling time is directly preferred. Generally speaking, the cooling time required for the first air cooler to cool the corresponding cold storage to the target temperature is set as the reference time, that is, the cooling time of the first air cooler is extended to a certain extent. Based on the fact that the cooling time is inversely proportional to the cooling power, the cooling power is reduced, that is, the power reduction operation of the first air cooler is controlled.

[0080] In actual operation, the air cooler with the longest minimum cooling time and the air cooler with the shortest minimum cooling time can be set as the first air cooler, and the current cooling power can be determined according to the benchmark cooling time. The current cooling power of the remaining air coolers is used as the current cooling power, and it is determined whether the sum of the current cooling powers of all air coolers is less than the maximum power threshold.

[0081] If not, the air cooler with the second shortest minimum cooling time is also used as the first air cooler, and the current cooling power is determined according to the benchmark cooling time. The air coolers other than the first air cooler still use the current PID cooling power as the current cooling power, and determine whether the sum of the current cooling powers of all air coolers is less than the maximum power threshold;

[0082] By analogy, as long as the sum of the current cooling power of all air coolers is greater than the maximum power threshold, more air coolers with smaller minimum cooling time will be selected according to the minimum cooling time, until the sum of the current cooling power of all air coolers is less than the maximum power threshold. At this time, the number of first air coolers is the minimum number of air coolers that makes the sum of the current cooling power corresponding to all air coolers less than the maximum power threshold.

[0083] Of course, in actual applications, it is also possible that all air coolers are used as the first air coolers. After the current cooling power is determined according to the benchmark cooling time as the cooling time, the sum of the current cooling powers of all air coolers is still greater than the maximum power threshold; this means that only reducing the power of some air coolers cannot guarantee the safe operation of the entire refrigeration system. At this time, all air coolers are directly operated at a further reduced power to ensure that the sum of the current cooling powers corresponding to all air coolers is less than the maximum power threshold.

[0084] In addition, in this embodiment, when selecting the first air cooler, it is not necessary to give priority to selecting the air cooler with the shortest minimum cooling time. Specifically, the air cooler with the smallest cooling capacity required to cool the corresponding cold storage to the target temperature can be given priority as the first air cooler, or the air cooler with the smallest temperature difference between the current temperature and the target temperature of the corresponding cold storage can be given priority as the first air cooler. There are other ways to determine the first air cooler in this application, which are not listed here one by one.

[0085] To sum up, in the refrigeration control process involving online temperature control of multiple air coolers in this application, when the total refrigeration power of each air cooler is too large, the refrigeration power of all air coolers is not directly and uniformly reduced. Instead, some of the air coolers are selected to operate at reduced power. On the basis of ensuring the overall refrigeration speed of each cold storage, more reasonable and refined adjustment and control of the refrigeration power of each air cooler is achieved, which is conducive to improving the temperature control effect of the air cooler on the cold storage.

[0086] Based on any of the above embodiments, during the actual normal and safe operation of the refrigeration unit, there is not only a maximum power threshold limit, but also a minimum power threshold limit, that is, the sum of the current cooling power of each air cooler cannot be less than the minimum power threshold.

[0087] To this end, in another optional embodiment of the present application, it may further include:

[0088] When the current total cooling power is less than the maximum power threshold, it is determined whether the current total cooling power is less than the minimum power threshold;

[0089] If so, multiple second air coolers are determined in each air cooler, and the maximum cooling power corresponding to each second air cooler is used as the current cooling power of the second air cooler, and the air coolers other than the second air cooler in each air cooler use the corresponding current PID cooling power as the current cooling power;

[0090] The number of the second air coolers is the minimum number of air coolers required to ensure that the sum of the current cooling powers corresponding to all air coolers is greater than the minimum power threshold.

[0091] It should be noted that in current refrigeration systems with multiple air coolers operating online, if the sum of the current PID cooling power determined by each air cooler through PID feedback calculation is less than the minimum power threshold of the refrigeration unit, it indicates that the cooling power of each air cooler is too low. Under normal circumstances, the refrigeration unit would be shut down, effectively stopping the cooling. However, it is clear that the current temperature of the cold storage corresponding to each air cooler has not reached the optimal target temperature. Shutting down the refrigeration unit at this time will affect the cold storage's refrigeration and preservation performance to a certain extent.

[0092] To this end, in this embodiment, the cooling power of some air coolers is expanded for operation. Some air coolers are selected from each air cooler as the second air cooler, and the maximum cooling power corresponding to each air cooler is used as the current cooling power. That is, the second air cooler is operated at the maximum cooling power, and the cooling power of each second air cooler is increased to the maximum, thereby increasing the total current cooling power of each air cooler, so that the total current cooling power is greater than the minimum power threshold, thereby ensuring the safe operation of the entire refrigeration system.

[0093] Similar to the above process of determining the first cooling air machine, there are also multiple ways to determine the second cooling air machine in this embodiment. In an optional embodiment of the present application, the process of determining each second cooling air machine may include:

[0094] The air coolers with the largest minimum cooling time among the air coolers are used as the first and second air coolers;

[0095] Among the air coolers except the first and second air coolers, a plurality of air coolers having the largest corresponding minimum cooling time are determined as the plurality of second air coolers except the first and second air coolers.

[0096] Different from the above embodiment in which the air cooler with the shortest minimum cooling time is preferentially selected as the first air cooler, in this embodiment, the air cooler with the longest minimum cooling time is preferentially selected as the second air cooler.

[0097] As mentioned above, the air cooler with the shortest minimum cooling time can generally reduce the temperature in its corresponding cold storage to the target temperature faster; obviously, the air cooler with the longest minimum cooling time will take longer to reduce the temperature in the cold storage to the target temperature. For this reason, in this application, the air cooler with the longest minimum cooling time is preferably selected as the second air cooler to operate according to the corresponding maximum cooling power. That is, it is equivalent to increasing the cooling power of each air cooler with the longest minimum cooling time. On the basis of expanding the current total cooling power of all air coolers, it can also further shorten the time required for all air coolers to reduce the temperature of the corresponding cold storage to the target temperature. Therefore, on the basis of accelerating the cooling efficiency of the cold storage, it avoids the problem of the refrigeration unit shutting down before the temperature in each cold storage reaches the target temperature, thereby improving the cooling effect of the cooling control of each cold storage, and also improving the refrigeration insurance effect of the cold storage to a certain extent.

[0098] In actual application, it is possible to first set among all the air coolers, only the maximum cooling power corresponding to the air cooler with the longest minimum cooling time is used as the current cooling power, while the current PID cooling power is used as the current cooling power for the other air coolers; if the sum of the current cooling powers of the air coolers is still less than the minimum power threshold, the maximum cooling power corresponding to the air cooler with the longest and second longest minimum cooling time is further used as the current cooling power, while the current PID cooling power is used as the current cooling power for the other air coolers; and so on, as long as the current cooling power of each air cooler does not meet the requirement of being greater than or equal to the maximum power threshold, the air cooler with the longest minimum cooling time among all the air coolers except the second air cooler is continued to be added as the second air cooler according to the size of the minimum cooling time; until the sum of the current cooling powers of all air coolers is less than the minimum power threshold; correspondingly, the number of second air coolers at this time is also the minimum number of air coolers that makes the sum of the current cooling powers corresponding to all air coolers greater than the minimum power threshold.

[0099] As mentioned above, when the temperature in the cold storage corresponding to a certain air cooler among the air coolers is less than or equal to the target temperature, the air cooler can be shut down; and the number of air coolers that currently need to work for cooling may be relatively small, so even if all air coolers are operating according to the corresponding maximum cooling power, the sum of the current cooling power of each air cooler is still less than the minimum power threshold. At this time, it means that only a very small number of cold storages have not been cooled to the target temperature, and the difference from the target temperature must be relatively small. At this time, even if the refrigeration unit is shut down, it will have little impact on the refrigeration and preservation of each cold storage.

[0100] Of course, in actual applications, in this embodiment, the air cooler with the largest difference between the current temperature of the corresponding cold storage and the target temperature can be preferentially selected as the second air cooler, or the air cooler with the largest cooling capacity required to cool the corresponding cold storage to the target temperature can be preferentially selected to implement the technical solution of this application. No specific restrictions are made in this embodiment.

[0101] In addition, in actual application, the sum of the current PID cooling powers of each air cooler may be between greater than or equal to the maximum power threshold and less than or equal to the minimum power threshold. In this case, the air coolers are operated directly according to the corresponding current PID cooling powers as the current cooling power.

[0102] Based on any of the above embodiments, as described above, if the temperature of only one or two cold storages has not yet reached the corresponding target temperature, if the refrigeration unit is directly controlled to shut down, although it will not affect other cold storages that do not need to continue to cool down, it will only affect the few cold storages that need to continue to cool down. Therefore, in another optional embodiment of the present application, it can further include:

[0103] If the number of cold storages that currently need to be refrigerated is greater than or equal to 1 and less than the set number threshold, and the sum of the current PID cooling powers of the third air coolers corresponding to the cold storages that currently need to be refrigerated is less than the minimum power threshold, then multiple air coolers are selected from the air coolers except the third air cooler to operate as supporting air coolers;

[0104] Controlling each third air cooler to operate at the corresponding maximum cooling power as the current cooling power;

[0105] According to the corresponding maximum cooling power and minimum power threshold of each third air cooler and the power formula Q2=(W1-m*W max ) / n, determine the current cooling power of each supporting cooling fan; where Q2 is the current cooling power of the supporting cooling fan, W1 is the minimum power threshold, W max is the maximum cooling power, m is the number of third air coolers, and n is the number of supporting air coolers;

[0106] Control each supporting running air cooler to operate at the corresponding current cooling power, and control the defrost heater of each supporting running air cooler to start.

[0107] It can be understood that this embodiment mainly targets the extreme case where there are only a very small number of one or several cold storages that need to be refrigerated, such as no more than three; the air cooler corresponding to the cold storage that currently needs to be refrigerated is used as the third air cooler. Even if each third air cooler operates according to the corresponding maximum cooling power, the sum of the maximum cooling powers is less than the minimum power threshold.

[0108] At this time, in order to improve the temperature reduction and temperature control effect of the cold storage corresponding to each third air cooler, in this embodiment, an operable supporting air cooler is further selected from each air cooler except the third air cooler.

[0109] As mentioned above, in the entire refrigeration system, under normal circumstances, if the temperature of the corresponding cold storage reaches the target temperature, the air cooler can be shut down. Therefore, in this embodiment, when selecting the accompanying air cooler, that is, among the air coolers whose corresponding cold storage temperatures have dropped below the target temperature, an air cooler that can operate normally is selected as the accompanying air cooler.

[0110] When selecting a supporting air cooler, you can give priority to the air cooler with a larger capacity in the corresponding cold storage, or give priority to the air cooler with the smallest difference between the current temperature and the target temperature of the corresponding cold storage. You can also directly operate all the air coolers that can be operated except the third air cooler as supporting air coolers.

[0111] During the joint cooling operation of each supporting air cooler and the third air cooler, the third air cooler should operate with its maximum cooling power as the current cooling power to ensure that it can cool the corresponding cold storage to the target temperature as soon as possible; and the current cooling power of the supporting air cooler is determined based on the principle that the sum of the current cooling powers of the supporting air cooler and the third air cooler is not less than the minimum power threshold; therefore, the difference between the minimum power threshold and the sum of the current cooling powers of each third air cooler is the sum of the current cooling powers of each supporting air cooler; the sum of the current cooling powers of each supporting air cooler divided by the total number of each supporting air cooler can determine the current cooling power of each supporting air cooler.

[0112] It can be seen that in this embodiment, the cooling effect of the cold storages that need to be cooled can be taken into account when the number of cold storages that need to be cooled is extremely small and the refrigeration power is extremely low.

[0113] Based on any of the above embodiments, in another optional embodiment of the present application, the method may further include:

[0114] According to the minimum downtime of the refrigeration unit connected to each air cooler after it is shut down and restarted, and the correlation formula t2=(T n -T max )[CρVE+C 气 ρ 气 V(1-E)] / W n , determine the maximum refrigeration shutdown temperature corresponding to each cold storage when the heating time is longer than the minimum shutdown time;

[0115] Among them, the heating time is the time required for the temperature in each cold storage to rise from the refrigeration shutdown temperature to the maximum allowable temperature; the correlation relationship is the relationship between the heating time corresponding to each cold storage and the corresponding refrigeration shutdown temperature; t2 is the heating time, T n is the refrigeration shutdown temperature, T max is the maximum allowable temperature corresponding to the cold storage;

[0116] When the current temperature corresponding to each cold storage is lower than the maximum refrigeration shutdown temperature, the refrigeration unit is controlled to shut down.

[0117] In this embodiment, to prevent frequent startup and shutdown of the refrigeration unit, a minimum shutdown duration is set for the refrigeration unit. This is the minimum time required between shutdown and restart of the refrigeration unit. Obviously, the longer the shutdown duration, the longer the refrigeration unit needs to cool after restarting. This can prevent both frequent startup and shutdown of the refrigeration unit.

[0118] However, it is further considered that if the refrigeration unit is shut down for too long, the temperature in the cold storage may rise to an excessively high temperature, thereby reducing the refrigeration and preservation effect in the cold storage.

[0119] To this end, in this application, the maximum refrigeration shutdown temperature corresponding to the cold storage is determined based on the correlation relationship between the heating time required for the temperature in each cold storage to rise from the refrigeration shutdown temperature to the maximum allowable temperature and the corresponding refrigeration shutdown temperature; that is, as long as the temperature of the cold storage is less than or equal to the maximum refrigeration shutdown temperature when the refrigeration unit is shut down, it can be ensured that the shutdown time of the refrigeration unit after it is shut down and then restarted can reach the minimum shutdown time, and it can also be ensured that when the refrigeration unit is shut down and then restarted, the temperature of each cold storage is less than or equal to the maximum allowable temperature of the cold storage.

[0120] In practical applications, the corresponding cooling shutdown temperature t can be calculated when the heating time in the correlation formula is greater than or equal to the minimum shutdown time. min ,Right now:

[0121] (T n -T max )[CρVE+C 气 ρ 气 V(1-E)] / W n =t2≥t min ;

[0122] The refrigeration shutdown temperature T calculated at this time is n That is the maximum refrigeration shutdown temperature corresponding to the cold storage.

[0123] In actual applications, if the fresh-keeping items stored in each cold storage allow, the target temperature of each cold storage can be set to be less than or equal to the corresponding maximum refrigeration shutdown temperature, thereby avoiding frequent start and stop of the refrigeration unit and helping to extend the service life of the refrigeration unit.

[0124] The following is an introduction to the control device for online temperature control of multiple cooling fans provided by an embodiment of the present invention. The control device for online temperature control of multiple cooling fans described below and the control method for online temperature control of multiple cooling fans described above can be referred to in correspondence with each other.

[0125] Figure 2 The structural block diagram of the control device for online temperature control of multiple cooling fans provided by the embodiment of the present invention is shown in FIG. Figure 2 The control device for online temperature control of multiple cooling fans may include:

[0126] The first calculation module 100 is used to perform a PID feedback adjustment operation based on the current temperature and target temperature of the cold storage corresponding to each air cooler to obtain the current PID cooling power of each air cooler; and to sum the current PID cooling powers of all the air coolers to obtain the current total cooling power;

[0127] The second operation module 200 is used to determine whether the current total cooling power is greater than a maximum power threshold;

[0128] The third operation module 300 is configured to determine, if the current total cooling power is greater than the maximum power threshold, the minimum cooling time required for each of the air coolers to reduce the temperature in the corresponding cold storage to the corresponding target temperature according to the corresponding maximum cooling power; and use the maximum value of the minimum cooling time as the benchmark cooling time;

[0129] a fourth operation module 400 for determining a plurality of first air coolers among the air coolers, and using the cooling power required for each of the first air coolers to reduce the temperature in the corresponding cold storage to the target temperature according to the benchmark cooling time as the current cooling power of the first air cooler; and using the corresponding current PID cooling power as the current cooling power of each of the air coolers except the first air cooler;

[0130] The number of the first air coolers is the minimum number of air coolers required to ensure that the total current cooling power corresponding to all the air coolers is less than the maximum power threshold.

[0131] In an optional embodiment of the present application, the fourth operation module 400 is specifically used to use the air cooler with the largest corresponding minimum cooling time among all the air coolers as the first first air cooler; sort the minimum cooling times corresponding to each of the air coolers except the first first air cooler according to size, and determine multiple air coolers with the smallest corresponding minimum cooling time as the multiple first air coolers except the first first air cooler.

[0132] In an optional embodiment of the present application, the third operation module 300 is specifically used to calculate the cooling capacity formula Q = (T-To) * [CρVE+C 气 ρ 气 V(1-E)], determine the cooling capacity of each air cooler to reduce the temperature in the corresponding cold storage to the target temperature; where Q is the cooling capacity, T is the current temperature, To is the target temperature, C is the specific heat capacity of the fresh food in the cold storage, ρ is the density of the fresh food in the cold storage, V is the volume of the cold storage, E is the utilization rate of the cold storage, C 气 is the specific heat capacity of the air in the cold storage, ρ 气 is the air density in the cold storage; according to the maximum cooling power and the cooling capacity corresponding to each of the air coolers, according to the minimum cooling time formula t=Q / (W max -W n ), determine the minimum cooling time corresponding to each of the air coolers; where t is the minimum cooling time, W max is the maximum cooling power, W n is the heat leakage power of the cold storage.

[0133] In an optional embodiment of the present application, the fourth operation module 400 is specifically configured to calculate the cooling formula Q1=Q / t0+W n , determine the current cooling power of each of the first air coolers; wherein Q1 is the current cooling power of each of the first air coolers, Q is the cooling capacity corresponding to the first air cooler, t0 is the reference cooling time, W n is the heat leakage power of the cold storage.

[0134] In an optional embodiment of the present application, a fifth operation module is further included, which is used to determine whether the current total cooling power is less than the minimum power threshold when the current total cooling power is less than the maximum power threshold; if so, multiple second air coolers are determined in each of the air coolers, and the maximum cooling power corresponding to each of the second air coolers is used as the current cooling power of the second air cooler, and the air coolers other than the second air cooler in each of the air coolers use the corresponding current PID cooling power as the current cooling power; wherein, the number of the second air coolers is the minimum number of units so that the sum of the current cooling powers corresponding to all the air coolers is greater than the minimum power threshold.

[0135] In an optional embodiment of the present application, the fifth operation module is specifically used to use the air cooler with the largest corresponding minimum cooling time among each of the air coolers as the first of the second air coolers; and among each of the air coolers other than the first of the second air coolers, determine multiple air coolers with the largest corresponding minimum cooling time as multiple second air coolers other than the first of the second air coolers.

[0136] In an optional embodiment of the present application, a sixth operation module is further included, which is used to select multiple auxiliary cooling fans from each cooling fan except the third cooling fan if the number of cold storages currently requiring refrigeration is greater than or equal to 1 and less than a set number threshold, and the sum of the current PID cooling powers of the third cooling fans corresponding to the cold storages currently requiring refrigeration is less than the minimum power threshold; control each of the third cooling fans to operate with the corresponding maximum cooling power as the current cooling power; and according to the corresponding maximum cooling power and the minimum power threshold of each third cooling fan and the power formula Q2=(W1-m*W max ) / n, determine the current cooling power of each of the accompanying running air coolers; wherein Q2 is the current cooling power of the accompanying running air cooler, W1 is the minimum power threshold, W max is the maximum cooling power, m is the number of the third air coolers, and n is the number of the supporting air coolers; each of the supporting air coolers is controlled to operate at the corresponding current cooling power, and the defrost heater of each of the supporting air coolers is controlled to start.

[0137] In an optional embodiment of the present application, a seventh operation module is further included, which is used to calculate the minimum shutdown time of the refrigeration unit commonly connected to each of the air coolers after it is restarted after being shut down, and the associated relationship t2=(T n -T max )[CρVE+C 气 ρ 气 V(1-E)] / W n, determine the maximum refrigeration shutdown temperature corresponding to each of the cold storages when the heating time is greater than the minimum shutdown time; wherein the heating time is the time required for the temperature in each of the cold storages to rise from the refrigeration shutdown temperature to the maximum allowable temperature; the association relationship is the relationship between the heating time corresponding to each of the cold storages and the corresponding refrigeration shutdown temperature; t2 is the heating time, T n is the refrigeration shutdown temperature, T max is the maximum allowable temperature corresponding to the cold storage; when the current temperature corresponding to each of the cold storages is lower than the maximum refrigeration shutdown temperature, the refrigeration unit is controlled to shut down.

[0138] The control device for online temperature control of multiple cooling fans in this embodiment is used to implement the aforementioned control method for online temperature control of multiple cooling fans. Therefore, the specific implementation method of the control device for online temperature control of multiple cooling fans can be seen in the embodiment part of the control method for online temperature control of multiple cooling fans in the previous text, and will not be repeated here.

[0139] The present application also provides an embodiment of a control device for online temperature control of multiple cooling fans, and the control device for online temperature control of multiple cooling fans may include:

[0140] memory for storing computer programs;

[0141] A processor is used to implement the steps of the control method for online temperature control of multiple cooling fans as described in any of the above items when executing the computer program.

[0142] The memory may be random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, register, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the technical field.

[0143] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device comprising a series of elements are inherent to the elements. In the absence of further restrictions, the elements limited by the statement "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements. In addition, the above-mentioned technical solutions provided in the embodiments of the present application are not described in detail in accordance with the corresponding technical solutions in the prior art to achieve the same principle, so as to avoid excessive elaboration.

[0144] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A method for controlling temperature of multiple cooling fans online, characterized in that: include: According to the current temperature and target temperature of the cold storage corresponding to each air cooler, a PID feedback adjustment operation is performed to obtain the current PID cooling power of each air cooler; and performing a summation operation on the current PID cooling powers of all the air coolers to obtain a current total cooling power; Determining whether the current total cooling power is greater than a maximum power threshold; If so, determining the minimum cooling time required for each of the air coolers to reduce the temperature in the corresponding cold storage to the corresponding target temperature according to the corresponding maximum cooling power; and taking the maximum value of each of the minimum cooling time as the benchmark cooling time; Determine a plurality of first air coolers among the air coolers, and use the cooling power of each first air cooler that reduces the temperature in the corresponding cold storage to the corresponding target temperature according to the benchmark cooling time as the current cooling power of the first air cooler; and each air cooler other than the first air cooler uses the corresponding current PID cooling power as the current cooling power; The number of the first air coolers is the minimum number of air coolers required to ensure that the total current cooling power corresponding to all the air coolers is less than the maximum power threshold.

2. The method for controlling temperature of multiple cooling fans online according to claim 1, characterized in that: A plurality of first air coolers are determined in each of the air coolers, including: The air cooler with the largest minimum cooling time among the air coolers is used as the first air cooler; The minimum cooling time corresponding to each of the air coolers except the first first air cooler is sorted according to size, and multiple air coolers with the smallest corresponding minimum cooling time are determined as the multiple first air coolers except the first first air cooler.

3. The control method for online temperature control of multiple cooling fans according to claim 1, characterized in that: Determining the minimum cooling time required for each of the air coolers to reduce the temperature in the corresponding cold storage to the corresponding target temperature according to the corresponding maximum cooling power includes: According to the current temperature and target temperature of the cold storage corresponding to each air cooler, according to the cooling capacity formula Q=(T-To)*[CρVE+C 气 ρ 气 V(1-E)], determine the cooling capacity of each air cooler to reduce the temperature in the corresponding cold storage to the target temperature; where Q is the cooling capacity, T is the current temperature, To is the target temperature, C is the specific heat capacity of the fresh food in the cold storage, ρ is the density of the fresh food in the cold storage, V is the volume of the cold storage, E is the utilization rate of the cold storage, C 气 is the specific heat capacity of the air in the cold storage, ρ 气 is the air density in the cold storage; According to the maximum cooling power and cooling capacity of each air cooler, the minimum cooling time formula t=Q / (W max -W n ), determine the minimum cooling time corresponding to each of the air coolers; where t is the minimum cooling time, W max is the maximum cooling power, W n is the heat leakage power of the cold storage.

4. The method for controlling temperature of multiple cooling fans online according to claim 3, characterized in that: The cooling power of each first air cooler used to reduce the temperature in the corresponding cold storage to the target temperature according to the benchmark cooling time is used as the current cooling power of the first air cooler, including: According to the refrigeration formula Q1=Q / t0+W n , determine the current cooling power of each of the first air coolers; wherein Q1 is the current cooling power of each of the first air coolers, Q is the cooling capacity corresponding to the first air cooler, t0 is the reference cooling time, W n is the heat leakage power of the cold storage.

5. The method for controlling temperature of multiple cooling fans online according to any one of claims 1 to 4, characterized in that: When the current total cooling power is less than the maximum power threshold, determining whether the current total cooling power is less than the minimum power threshold; If so, multiple second air coolers are determined from each of the air coolers, and the maximum cooling power corresponding to each of the second air coolers is used as the current cooling power of the second air cooler, and the air coolers other than the second air cooler in each of the air coolers use the corresponding current PID cooling power as the current cooling power; The number of the second air coolers is the minimum number of air coolers required to ensure that the total current cooling power corresponding to all the air coolers is greater than the minimum power threshold.

6. The control method for online temperature control of multiple cooling fans according to claim 5, characterized in that: A plurality of second air coolers are determined in each of the air coolers, including: The air cooler with the largest minimum cooling time among the air coolers is used as the first and the second air coolers; Among the air coolers except the first one of the second air coolers, a plurality of air coolers with the largest corresponding minimum cooling time are determined as the plurality of second air coolers except the first one of the second air coolers.

7. The method for controlling temperature of multiple cooling fans online according to claim 5, characterized in that: If the number of cold storages currently requiring refrigeration is greater than or equal to 1 and less than a set number threshold, and the sum of the current PID cooling powers of the third air coolers corresponding to the cold storages currently requiring refrigeration is less than the minimum power threshold, then multiple air coolers are selected from the air coolers other than the third air cooler to operate as supporting air coolers; Controlling each of the third air coolers to operate at a corresponding maximum cooling power as a current cooling power; According to the corresponding maximum cooling power and the minimum power threshold of each third cooling air machine and the power formula Q2=(W1-m*W max ) / n, determine the current cooling power of each of the accompanying running air coolers; wherein Q2 is the current cooling power of the accompanying running air cooler, W1 is the minimum power threshold, W max is the maximum cooling power, m is the number of the third air coolers, and n is the number of the accompanying air coolers; Each of the accompanying air coolers is controlled to operate at the corresponding current cooling power, and a defrost heater of each of the accompanying air coolers is controlled to start.

8. The method for controlling temperature of multiple cooling fans online according to claim 5, characterized in that: Also includes: According to the minimum shutdown time of the refrigeration unit commonly connected to each of the air coolers after it is shut down and restarted, and the correlation formula t2=(T n -T max )[CρVE+C 气 ρ 气 V(1-E)] / W n , determining the maximum refrigeration shutdown temperature corresponding to each of the cold storages when the heating time of the cold storage is greater than the minimum shutdown time; Among them, the heating time is the time required for the temperature in each cold storage to rise from the refrigeration shutdown temperature to the maximum allowable temperature; the association relationship is the relationship between the heating time corresponding to each cold storage and the corresponding refrigeration shutdown temperature; t2 is the heating time, T n is the refrigeration shutdown temperature, T max is the maximum allowable temperature corresponding to the cold storage; When the current temperature corresponding to each of the cold storages is lower than the maximum refrigeration shutdown temperature, the refrigeration unit is controlled to shut down.

9. A control device for online temperature control of multiple cooling fans, characterized in that: include: The first calculation module is used to perform a PID feedback adjustment operation based on the current temperature and target temperature of the cold storage corresponding to each air cooler to obtain the current PID cooling power of each air cooler; and to sum the current PID cooling powers of all the air coolers to obtain the current total cooling power; A second operation module is used to determine whether the current total cooling power is greater than a maximum power threshold; a third operation module, configured to determine, if the current total cooling power is greater than the maximum power threshold, the minimum cooling time required for each of the air coolers to reduce the temperature in the corresponding cold storage to the corresponding target temperature according to the corresponding maximum cooling power; and use the maximum value of each of the minimum cooling time as the benchmark cooling time; a fourth operation module, configured to determine a plurality of first air coolers among the air coolers, and use the cooling power of each first air cooler required to reduce the temperature in the corresponding cold storage to the target temperature according to the benchmark cooling time as the current cooling power of the first air cooler; and each air cooler other than the first air cooler uses the corresponding current PID cooling power as the current cooling power; The number of the first air coolers is the minimum number of air coolers required to ensure that the total current cooling power corresponding to all the air coolers is less than the maximum power threshold.

10. A control device for online temperature control of multiple cooling fans, characterized in that: include: memory for storing computer programs; A processor is configured to implement the steps of the method for controlling online temperature control of multiple cooling fans as claimed in any one of claims 1 to 8 when executing the computer program.

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