Temperature control method and temperature control system for a constant temperature and humidity device

Abstract

The application provides a temperature control method and a temperature control system of a constant temperature and humidity device, which comprises the following steps: a temperature threshold setting step, in which a first temperature threshold T1 and a second temperature threshold T2 are set according to the fluctuation range of an external environment temperature T; a dynamic adjustment step, in which a set temperature T0 is input, and an actual temperature T3 of the working space is collected; if T0>T3, it is determined that the dynamic adjustment mode is heating; if T0<T3, it is determined that the dynamic adjustment mode is cooling; a final operation mode determination step, in which if T0 is greater than or equal to T1, it is determined that the final operation mode is heating; if T0 is less than or equal to T2, it is determined that the final operation mode is cooling; and if T2<T0<T1, according to the determination result of the dynamic adjustment mode in the dynamic adjustment step, the type of the final operation mode is determined. Accordingly, the cost and energy consumption can be saved, and the temperature control efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of constant temperature and humidity control equipment, and in particular to a temperature control method and temperature control system for a constant temperature and humidity device that can save costs and energy consumption and improve temperature control efficiency. Background Technology

[0002] Many industrial processing and testing operations currently require constant temperature and humidity environments, necessitating the use of a constant temperature and humidity control system to regulate the temperature and humidity within the test chamber. Because the chamber temperature control range is relatively large, it operates in cooling, heating, or alternating modes.

[0003] In existing technologies, a temperature sensor is installed outside the enclosure to detect the ambient temperature. When the ambient temperature is higher than the set temperature, the final operating mode inside the enclosure is determined to be cooling; otherwise, the final operating mode is heating. This method requires an external temperature sensor, increasing cost and complexity. Furthermore, because the enclosure contains insulation panels and stainless steel shelves, which store heat and cold, these components continue to release heat / cold energy when the set temperature changes or the temperature control mode switches, thus interfering with the internal temperature.

[0004] Furthermore, existing technologies also include solutions that simultaneously operate the cooling and heating units. In cooling mode, the heating unit is activated to address the problem of excessive minimum cooling capacity near ambient temperature; conversely, in heating mode, the cooling unit is activated to address the problem of excessive minimum heating capacity near ambient temperature. However, operating both modes simultaneously results in energy waste.

[0005] Therefore, there are technical challenges in the existing technology to save costs and energy consumption and improve temperature control efficiency. Summary of the Invention

[0006] The purpose of this application is to provide a temperature control method and control system for a constant temperature and humidity device that can save costs and energy consumption and improve temperature control efficiency. To achieve the above objective, one aspect of this application is a temperature control method for a constant temperature and humidity device, which controls the cooling / heating action of a temperature control unit via a control system, thereby adjusting the temperature of the working space within the constant temperature and humidity device; the temperature control method is characterized by including the following steps: S1: Temperature threshold setting step, setting a first temperature threshold T1 and a second temperature threshold T2 based on the fluctuation range of the external ambient temperature T, wherein T1 is greater than the highest value T of the ambient temperature T. max The second temperature threshold T2 is less than the lowest value of the ambient temperature T. min; S2: dynamic adjustment step, cooling / heating the working space according to a dynamic adjustment mode; input a set temperature T₀, collect an actual temperature T₃ of the working space, if T₀>T₃, determining that the dynamic adjustment mode is heating, and the temperature control unit performs a heating operation; if T₀<T₃, determining that the dynamic adjustment mode is cooling, and the temperature control unit performs a cooling operation; S3: final operation mode determination step, the final operation mode is a mode switchable after cooling / heating adjustment in the dynamic adjustment step; if T₀ is greater than or equal to T₁, determining that the final operation mode is heating; if T₀ is less than or equal to T₂, determining that the final operation mode is cooling; if T₂<T₀<T₁, determining the type of the final operation mode according to the determination result of the dynamic adjustment mode in the dynamic adjustment step.

[0007] According to the foregoing technical solution, without arranging an external temperature sensor, the final operation mode inside the box can be determined and the temperature inside the box can be adjusted according to the set temperature, the actual temperature inside the box and other conditions.

[0008] In a preferred mode, in the final operation mode determination step, if the dynamic adjustment mode is cooling, the final operation mode is determined to be heating; if the dynamic adjustment mode is heating, the final operation mode is determined to be cooling.

[0009] According to the foregoing technical solution, the final operation mode is determined as the opposite of the dynamic adjustment mode.

[0010] In a preferred mode, under the dynamic adjustment mode, after the actual temperature T₃ of the working space approaches and reaches the set temperature T₀, it will continue to change in a direction away from T₀, and the absolute value obtained by subtracting T₀ from T₃ at this time is taken as the overshoot ΔT; after the final operation mode determination step, whether to switch to the final operation mode for operation is determined according to the magnitude of ΔT.

[0011] According to the foregoing technical solution, after the dynamic adjustment mode makes the temperature inside the box reach a certain overshoot, whether to switch to the final operation mode is determined according to the temperature inside the box and the overshoot condition.

[0012] In a preferred mode, a first overshoot threshold ΔT is set for the overshoot ΔT min ; when ΔT reaches ΔT min , the temperature control unit shuts down, that is, stops the cooling action / heating action under the dynamic adjustment mode; after that, if ΔT decreases and is less than ΔT min , the temperature control unit resumes the cooling action / heating action under the dynamic adjustment mode before shutdown, until ΔT reaches ΔT again min , the temperature control unit shuts down again, and this cycle repeats.

[0013] According to the aforementioned technical solution, since the cabinet partitions and shelves store excess heat / cold energy, the temperature inside the cabinet will rebound after the temperature control unit stops, thus reducing the overshoot. The temperature control unit stops, the overshoot decreases, and then restarts, repeating this cycle to consume the excess heat / cold energy stored in the cabinet partitions and shelves.

[0014] In a preferred embodiment, a second overshoot threshold ΔT is set. max ΔT min <ΔT max ; when ΔT reaches ΔT min After the temperature control unit stops, if ΔT increases to ΔT after a specified downtime, ... max Then, it will switch to the final running mode.

[0015] According to the aforementioned technical solution, after the specified downtime ΔT increases to ΔT... max It can be determined that the heat / cold energy stored in the partitions and shelves of the chamber has been released, and the temperature inside the chamber will no longer rebound. Only then can the overshoot increase to the second overshoot threshold, so that the final operating mode can be switched.

[0016] In a preferred embodiment, the downtime is 3 minutes.

[0017] In a preferred embodiment, the first overshoot threshold ΔT min The temperature is 0.05℃, and the second overshoot threshold is ΔT. max It is 0.1℃.

[0018] In a preferred embodiment, in the final operating mode, if ΔT decreases again to less than ΔT min When this happens, the temperature control unit resumes the cooling / heating operation in the dynamic adjustment mode before shutdown, until ΔT reaches ΔT again. min At that time, the temperature control unit stopped again.

[0019] According to the aforementioned technical solution, after reaching the final operating mode, if the overshoot ΔT decreases again to less than ΔT min If this happens, the system can be switched back to the state before the temperature control unit stopped, so that the overshoot ΔT reaches ΔT again. min At that time, the temperature control unit stopped again.

[0020] In a preferred embodiment, the temperature control unit is a semiconductor refrigeration chip.

[0021] Furthermore, another aspect of this application is a temperature control system for a constant temperature and humidity device, used to adjust the temperature of the working space within the constant temperature and humidity device, comprising a temperature control unit, a temperature measurement unit, and a mode determination unit; the temperature control unit is used to perform cooling / heating actions on the working space; the temperature measurement unit is used to detect the actual temperature T3 of the working space; the mode determination unit is used to determine the temperature control mode of the working space; and the temperature control system adjusts the temperature of the working space according to the aforementioned temperature control method.

[0022] According to the aforementioned technical solution, the internal temperature of the chamber can be adaptively adjusted without the need for an external temperature sensor, saving costs and energy consumption and improving control efficiency. Attached Figure Description

[0023] To more clearly illustrate this application, the accompanying drawings will be described and explained below. Obviously, the drawings described below only illustrate certain aspects of some exemplary embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0024] Figure 1 This is a flowchart illustrating a temperature control method.

[0025] Figure 2 This is an example of a temperature mode switching flowchart.

[0026] Attached image caption: Detailed Implementation

[0027] Various exemplary embodiments of this application are described in detail below with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the application or its application or use. This application can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the application thorough and complete, and to fully express the scope of the application to those skilled in the art. It should be noted that, unless otherwise stated, the relative arrangement of components and steps, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0028] As used in this application, the words “including” or “comprising” or similar terms mean that the element preceding the word covers the element listed after the word, and do not exclude the possibility that it may also cover other elements.

[0029] All terms used in this application (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this application pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as being interpreted with idealized or highly formalized meanings, unless explicitly defined herein.

[0030] For components, specific model numbers and other parameters of components not described in detail in this section, the interrelationships between components and control circuits, these may be considered as techniques, methods and devices known to those skilled in the art, but where appropriate, such techniques, methods and devices should be considered part of the specification.

[0031] Constant temperature and humidity chamber

[0032] For example, the working space described in this application is the internal space of a test chamber, which is typically a constant temperature and humidity chamber. As an example, the temperature range inside the chamber is... The relative humidity range is 10%-90%, the temperature fluctuation range is ±0.1℃, and the relative humidity fluctuation range is ±1.5%. When using this test chamber for experiments, researchers sometimes cultivate and breed fruit flies, bacteria, cells, etc., which requires a high degree of temperature uniformity within the chamber.

[0033] It is understood that the working space is not limited to the aforementioned test chamber; it can also be other spaces with high requirements for temperature uniformity. The temperature range within the chamber is also not limited to... The temperature fluctuation range is not limited to ±0.1℃. The above data is only used as an example and is not intended to be specific.

[0034] In traditional technology, a temperature sensor is installed outside the chamber to detect the ambient temperature T. When the ambient temperature T is higher than the set temperature T0, the final operating mode of the internal temperature control is cooling; conversely, the final operating mode is heating. This method requires an external temperature sensor, increasing cost and complexity. Furthermore, because the chamber contains insulation panels and stainless steel shelves, it stores a certain amount of heat / cold energy. When the set temperature T0 changes or the temperature control mode switches, the insulation panels and shelves continue to release heat / cold energy, causing the internal temperature to fluctuate and rebound. Therefore, relying solely on the ambient temperature T to determine the final operating mode may lead to misjudgments.

[0035] Furthermore, traditional technologies also include solutions that operate both cooling and heating units simultaneously. In cooling mode, the heating unit is activated to address the issue of excessive minimum cooling capacity near ambient temperature; conversely, in heating mode, the cooling unit is activated to address the issue of excessive minimum heating capacity near ambient temperature. While operating both modes simultaneously reduces the control difficulty when the set temperature T0 is close to the ambient temperature T, it results in energy waste.

[0036] Temperature control methods

[0037] The following is for reference Figure 1 and Figure 2 This application describes the temperature control method. Figure 1 This is a flowchart of the temperature control method; the diagram shows the temperature mode switching flowchart.

[0038] First, the temperature control method will be explained in detail.

[0039] See Figure 1 The temperature control method described in this application regulates the temperature of the workspace by controlling the cooling / heating action of a temperature control unit through a control system. This temperature control method includes the following steps:

[0040] S1: Temperature threshold setting step: Based on the fluctuation range of the external ambient temperature T, set a first temperature threshold T1 and a second temperature threshold T2, where T1 is greater than the highest value of the ambient temperature T. max The second temperature threshold T2 is less than the lowest value of the ambient temperature T. min .

[0041] Specifically, assuming the ambient temperature T outside the test chamber is between 18℃ and 35℃, the first temperature threshold T1 can be set to be greater than the highest value of the ambient temperature T. max The second temperature threshold is less than the minimum value of the ambient temperature T. min .

[0042] Therefore, when the input set temperature T0 is greater than the first temperature threshold T1 or less than the second temperature threshold T2, the control system can directly determine that the set temperature T0 is higher or lower than the ambient temperature T outside the chamber, and thus can directly determine that the final operating mode of the test chamber is heating / cooling.

[0043] To avoid misjudgment, it is preferable to widen the temperature threshold range, that is, the first temperature threshold T1 is much higher than the highest value of the ambient temperature T. max The second temperature threshold T2 is much smaller than the minimum value of the ambient temperature T. min For example, the first temperature threshold T1 is 50℃ and the second temperature threshold T2 is 10℃, so as to leave sufficient margin.

[0044] S2: Dynamic adjustment step, cooling / heating the workspace according to the dynamic adjustment mode; input the set temperature T0, and collect the actual temperature T3 of the workspace. If T0 > T3, it is determined that the dynamic adjustment mode is heating, and the temperature control unit performs heating operation; if T0 < T3, it is determined that the dynamic adjustment mode is cooling, and the temperature control unit performs cooling operation.

[0045] Specifically, after the set temperature T0 is input, a dynamic temperature adjustment is first performed to bring the temperature inside the chamber closer to the set temperature T0. To do this, the actual temperature T3 inside the chamber is first collected, and based on the relative magnitudes of T0 and T3, it is determined whether to adjust the temperature inside the chamber by raising or lowering it.

[0046] In actual control, the order of the above-mentioned S1 temperature threshold setting step and S2 dynamic adjustment step can be interchanged, and no specific restrictions are made here.

[0047] S3: Final operating mode determination step, wherein the final operating mode is the mode that can be switched after the cooling / heating adjustment in the dynamic adjustment step; if T0 is greater than or equal to T1, the final operating mode is determined to be heating; if T0 is less than or equal to T2, the final operating mode is determined to be cooling; if T2 < T0 < T1, the type of the final operating mode is determined according to the determination result of the dynamic adjustment mode in the dynamic adjustment step.

[0048] Specifically, after the heating / cooling adjustment in the dynamic adjustment step, the actual temperature T3 inside the chamber has reached near the set temperature T0. At this point, it is necessary to determine the final operating mode and decide whether to switch to the final operating mode based on the temperature overshoot.

[0049] If T0 is greater than or equal to T1, it means the set temperature T0 is higher than the highest value of the ambient temperature T, and the control system can directly determine the final operating mode as heating. Because the insulation inside the chamber is limited, there is heat loss. If a cooling action is introduced to suppress overshoot during heating, it would be equivalent to introducing a source of temperature interference, causing secondary temperature fluctuations. Similarly, if T0 is less than or equal to T2, it means the set temperature T0 is lower than the lowest value of the ambient temperature T, and the control system can directly determine the final operating mode as cooling.

[0050] However, if T0 is between T1 and T2, since the external ambient temperature T is no longer detected, it is impossible to directly determine the relationship between the set temperature T0 and the ambient temperature T.

[0051] Therefore, as a preferred approach, in the final operating mode determination step, the final operating mode is set as the opposite of the dynamic adjustment mode. That is, if the dynamic adjustment mode is cooling, then the final operating mode is determined to be heating; if the dynamic adjustment mode is heating, then the final operating mode is determined to be cooling.

[0052] In dynamic adjustment mode, after the actual temperature T3 inside the cabinet approaches and reaches the set temperature T0, it will continue to change away from T0. The overshoot ΔT is the absolute value of T3 minus T0 at this point. If the dynamic adjustment mode is for heating, the actual temperature T3 will continue to exceed the set temperature T0 after reaching it. If the dynamic adjustment mode is for cooling, the actual temperature T3 will continue to decrease and fall below the set temperature T0 after reaching it. Therefore, the overshoot ΔT is the absolute value of the difference between T3 and T0 at this point.

[0053] Furthermore, after the final operating mode determination step, the temperature control mode inside the chamber is switched to the final operating mode based on the magnitude of the overshoot ΔT.

[0054] Specifically, see Figure 2 Set a first overshoot threshold ΔT for the overshoot amount ΔT. min When Δ reaches ΔT min When this happens, the temperature control unit, i.e., the cooling / heating unit, stops, ceasing the cooling / heating action in dynamic adjustment mode.

[0055] Then, if ΔT decreases and becomes less than ΔT min The temperature control unit resumes the cooling / heating operation in the dynamic adjustment mode before shutdown, until ΔT reaches ΔT again. min When this happens, the temperature control unit stops again, and this cycle repeats continuously.

[0056] At the same time, a second overshoot threshold ΔT is set. max ΔT min <ΔT max ; when ΔT reaches ΔT min After the temperature control unit stops, if ΔT increases to ΔT after a specified shutdown time, such as three minutes, then... max Then switch to the final running mode.

[0057] The following example illustrates the process described above.

[0058] As a first example, assuming the ambient temperature T is 18℃-35℃, T1 is 50℃, T2 is 10℃, and the current actual temperature inside the chamber T3 is... The input set temperature T0 is 40℃, and T0 is between T1 and T2. The control system will first enter dynamic adjustment mode, that is, it will first activate the cooling action to lower the actual temperature T3 inside the chamber from... The temperature drops rapidly to 40°C. After the actual temperature T3 inside the chamber drops to 40°C, it will usually continue to decrease, resulting in an overshoot ΔT.

[0059] Here, the first overshoot threshold ΔT is set. min The second overshoot threshold ΔT is 0.05℃. max With an overshoot threshold of 0.1℃, the fluctuation of the chamber temperature can be reduced. When the actual temperature T3 overshoots downward to the first overshoot threshold ΔT... min At 0.05℃, the temperature control unit stops cooling. Because the partitions and shelves in the cabinet store heat, they continue to dissipate heat into the cabinet, causing the actual temperature T3 inside the cabinet to rebound. This results in the overshoot ΔT being less than 0.05℃, at which point the temperature control unit restarts, resuming the cooling operation before shutdown and continuing to cool the cabinet until the overshoot ΔT returns to 0.05℃. This cycle repeats until all the heat stored in the partitions and shelves is released.

[0060] In other words, during dynamic heating / cooling, excess heat / cold energy is stored in the cabinet partitions and shelves. After the temperature control unit shuts down, the internal temperature rebounds, reducing the overshoot ΔT. The temperature control unit shuts down, the overshoot decreases, and then restarts, repeating this cycle to dissipate the excess heat / cold energy stored in the partitions and shelves. For example, this cycle may last for 10-24 hours in the experiment.

[0061] After the heat stored in the cabinet partitions and shelves has been released, the temperature control unit shuts down when the overshoot ΔT reaches 0.05℃ again. Since it is no longer affected by the heat stored in the cabinet, and the actual temperature inside the cabinet, T3, is higher than the ambient temperature T, the interior space will dissipate heat to the external environment, causing the internal temperature to continue to drop. This will cause the overshoot ΔT to continue to increase. If, after the temperature control unit has been off for a period of time, such as three minutes, the overshoot ΔT reaches the second overshoot threshold ΔT... max If the temperature drops by 0.1℃, the temperature control mode will be switched to the final operating mode. According to the final operating mode determination procedure, since the previous dynamic adjustment mode was cooling, the final operating mode is determined to be heating. Therefore, the control system will switch the temperature control mode to heating.

[0062] After switching to the final operating mode, the temperature inside the chamber will rise during heating, causing the overshoot ΔT to gradually decrease. When the overshoot ΔT reaches the first overshoot threshold ΔT again... min At 0.05℃, the temperature control unit shuts down again. As heat dissipates from the chamber, the temperature drops again, causing the overshoot ΔT to gradually increase. When it reaches the second overshoot threshold ΔT... max When the temperature reaches 0.1℃, the system switches back to the final operating mode to start heating, and this cycle repeats continuously.

[0063] As a second example, assuming the ambient temperature T is 18℃-35℃, T1 is 50℃, T2 is 10℃, the current actual temperature inside the chamber T3 is 70℃, and the input set temperature T0 is 15℃, with T0 falling between T1 and T2, the control system, in dynamic adjustment mode, first activates the cooling action, lowering the actual temperature inside the chamber T3 from... The temperature drops to 15℃. After the actual temperature T3 inside the chamber drops to 15℃, it will usually continue to decrease, resulting in an overshoot ΔT.

[0064] Here, the first overshoot threshold ΔT is set. min The second overshoot threshold ΔT is 0.05℃. max The overshoot is 0.1℃. When the actual temperature T3 overshoots downward to the first overshoot threshold ΔT... min At 0.05℃, the temperature control unit stops cooling. At this time, because the partitions and shelves of the cabinet store heat, it will continue to dissipate heat into the cabinet, so the actual temperature T3 inside the cabinet will rise. When the overshoot ΔT is less than 0.05℃, the temperature control unit will restart and resume the cooling operation before it stopped, continuing to cool the inside of the cabinet until the overshoot ΔT reaches 0.05℃ again. This cycle continues until all the heat stored in the partitions and shelves of the cabinet is released.

[0065] Once the heat stored in the cabinet partitions and shelves has been released, the temperature control unit shuts down when the overshoot ΔT reaches 0.05℃ again. Although no longer affected by the heat stored in the cabinet partitions and shelves, the actual temperature T3 inside the cabinet is still lower than the ambient temperature T. The cabinet will absorb heat from the external environment, causing the internal temperature to rise and thus reducing the overshoot ΔT. When the overshoot ΔT is less than 0.05℃, the temperature control unit restarts, resuming the cooling operation before shutdown, until the overshoot ΔT reaches 0.05℃ again, and this cycle repeats.

[0066] Since the actual temperature T3 inside the chamber is lower than the external ambient temperature T, after the temperature control unit stops, the space inside the chamber will absorb heat from the external environment, causing the actual temperature T3 to rise again. Therefore, it is difficult for the overshoot ΔT to continue to increase to 0.1℃.

[0067] However, during this process, if the temperature control unit stops for a period of time, such as three minutes, and the overshoot ΔT actually reaches the second overshoot threshold ΔT... max If the temperature drops by 0.1℃, the temperature control mode will be switched to the final operating mode. According to the final operating mode determination procedure, since the previous dynamic adjustment mode was cooling, the final operating mode is determined to be heating, and thus, the temperature control mode will be switched to heating.

[0068] After switching to the final operating mode, the internal temperature will rise during heating, causing the overshoot ΔT to gradually decrease. When the overshoot ΔT reaches 0.05℃ again, the temperature control unit will stop again. The internal space will then rise due to heat absorption from the external environment, causing the overshoot ΔT to gradually decrease. When the overshoot ΔT is less than 0.05℃, the temperature control unit will restart, resuming the cooling operation in dynamic adjustment mode, causing the internal temperature to drop. The overshoot ΔT will then reach 0.05℃ again, at which point the temperature control unit will stop again.

[0069] It is understandable that in the second example, the chamber mainly cycles through the dynamic adjustment mode of cooling down, temperature control unit stopping, internal heat absorption temperature rising, and temperature control unit restarting cooling. Even if, under special circumstances, the overshoot ΔT reaches the second overshoot threshold ΔT... max After switching to the final operating mode for heating, the system will return to the aforementioned cyclic state due to the decrease in overshoot ΔT. This differs from the first example mentioned above.

[0070] In contrast, traditional technologies, assuming the input set temperature is lower than the actual temperature inside the chamber, typically increase the cooling capacity directly, causing an overshoot of 0.1℃, before switching to heating mode to reduce the overshoot. However, because the heat stored in the chamber's partitions and shelves remains, the internal temperature continues to rise. Therefore, it's necessary to continuously increase the cooling capacity to maintain the heat load balance and stabilize the temperature. Consequently, traditional solutions increase energy consumption and internal temperature fluctuations.

[0071] It should be noted that in actual operation, the actual temperature inside the chamber will be affected by factors such as the ambient temperature outside the chamber, the heat / cold energy stored in the chamber, and the cooling / heating efficiency of the temperature control unit. Among these, the ambient temperature outside the chamber primarily affects heat transfer between the inside and outside of the chamber. Chamber partitions and shelves, which store heat / cold energy, must first reach a temperature above the set temperature to ensure temperature stability inside the chamber. The test chamber uses thermoelectric coolers for cooling and heating, with heat exchange via fans. Poor localized air circulation can also affect the cooling / heating performance of the thermoelectric coolers.

[0072] In summary, the temperature control method of this application achieves high-precision temperature control through mode determination and mode switching, saving the need for external temperature sensors. It also releases the heat / cold energy stored in the cabinet partitions and shelves through cyclic fine-tuning. Compared with traditional technologies, it has lower cost, less energy consumption and better temperature stability.

[0073] It should be understood that the specific embodiments described above are only used to explain this application, and the scope of protection of this application is not limited thereto. Any changes, substitutions, or combinations made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and inventive concept of this application, should be covered within the scope of protection of this application.

Claims

1. A temperature control method for a constant temperature and humidity device, wherein a control system controls a cooling operation / heating operation of a temperature control unit, thereby adjusting a temperature of a working space in the constant temperature and humidity device; characterized in that the temperature control method comprises the following steps: S1: Temperature threshold setting step: Based on the fluctuation range of the external ambient temperature T, set a first temperature threshold T1 and a second temperature threshold T2, where T1 is greater than the highest value of the ambient temperature T. max The second temperature threshold T2 is less than the lowest value of the ambient temperature T. min ; S2: Dynamic adjustment step, performing cooling / heating on the working space according to a dynamic adjustment mode; inputting a set temperature T0, collecting an actual temperature T3 of the working space, if T0>T3, determining that the dynamic adjustment mode is heating, and the temperature control unit performs heating operation; if T0<T3, determining that the dynamic adjustment mode is cooling, and the temperature control unit performs cooling operation; S3: Final operation mode determination step, wherein the final operation mode is a mode switchable after cooling / heating adjustment in the dynamic adjustment step; if T0 is greater than or equal to T1, determining that the final operation mode is heating; if T0 is less than or equal to T2, determining that the final operation mode is cooling; if T2<T0<T1, determining a type of the final operation mode according to a determination result of the dynamic adjustment mode in the dynamic adjustment step; in the dynamic adjustment mode, after the actual temperature T3 of the working space approaches and reaches the set temperature T0, it will continue to change in a direction away from T0, and the absolute value obtained by subtracting T0 from T3 at this time is an overshoot ΔT; after the final operation mode determination step, determining whether to switch to operation in the final operation mode according to a magnitude of ΔT; Set a first overshoot threshold ΔT for the overshoot amount ΔT. min When ΔT reaches ΔT min When the temperature control unit stops, that is, the cooling / heating operation in the dynamic adjustment mode is stopped; thereafter, if ΔT decreases and becomes less than ΔT min The temperature control unit resumes the cooling / heating operation in the dynamic adjustment mode before shutdown, until ΔT reaches ΔT again. min When this happens, the temperature control unit stops again, and this cycle repeats continuously. Set the second overshoot threshold ΔT max ΔT min <ΔT max ; when ΔT reaches ΔT min After the temperature control unit stops, if ΔT increases to ΔT after a specified downtime, ... max Then, it will switch to the final running mode.

2. The temperature control method for a constant temperature and humidity device according to claim 1, characterized in that: in the final operation mode determination step, if the dynamic adjustment mode is cooling, determining that the final operation mode is heating; if the dynamic adjustment mode is heating, determining that the final operation mode is cooling.

3. The temperature control method for a constant temperature and humidity device according to claim 2, characterized in that: the shutdown time is 3 minutes.

4. The temperature control method for a constant temperature and humidity device according to claim 2 or 3, characterized in that: The first overshoot threshold ΔT min The temperature is 0.05℃, and the second overshoot threshold is ΔT. max It is 0.1℃.

5. The temperature control method for a constant temperature and humidity device according to claim 2 or 3, characterized in that: In the final operating mode, if ΔT decreases again to less than ΔT min When this happens, the temperature control unit resumes the cooling / heating operation in the dynamic adjustment mode before shutdown, until ΔT reaches ΔT again. min At that time, the temperature control unit stopped again.

6. The temperature control method for a constant temperature and humidity device according to claim 1, characterized in that: the temperature control unit is a semiconductor cooling plate.

7. A temperature control system for a constant temperature and humidity device, configured to adjust a temperature of a working space in the constant temperature and humidity device, characterized in that: comprising a temperature control unit, a temperature measurement unit, and a mode determination unit; the temperature control unit is configured to execute a cooling operation / heating operation on the working space; the temperature measurement unit is configured to detect an actual temperature T3 of the working space; the mode determination unit is configured to determine a temperature control mode of the working space; the temperature control system adjusts the temperature of the working space according to the temperature control method of any one of claims 1-6.

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