Control method and control device for constant temperature and humidity chamber, and constant temperature and humidity chamber

Abstract

This application relates to the field of constant temperature and humidity control technology, and discloses a control method and control device for a constant temperature and humidity chamber, as well as the chamber itself. The control method for the constant temperature and humidity chamber includes: acquiring the internal temperature, internal humidity, and surface temperature of the main evaporator of the chamber; calculating the dew point temperature based on the internal temperature and humidity; determining whether the main evaporator has a concealed dehumidification function based on the surface temperature and dew point temperature; and, if a concealed dehumidification function exists, controlling the constant temperature and humidity chamber to execute a preset optimized control logic in terms of humidity control. This application can improve the stability of humidity control in a constant temperature and humidity chamber.

Description

Technical Field

[0001] This application relates to the field of constant temperature and humidity control technology, such as a control method and control device for a constant temperature and humidity chamber, and a constant temperature and humidity chamber. Background Technology

[0002] Currently, constant temperature and humidity chambers are widely used in the fields of electronics, chemical industry, biology, and medicine to simulate specific temperature and humidity environments for product performance testing, reliability testing, or sample preservation.

[0003] In related technologies, a constant temperature chamber typically consists of a refrigeration section (compressor, condenser, throttling device, main evaporator), a dehumidification section (small evaporator and dedicated dehumidification valve), and a humidification device connected in series. Through the synergistic effect of refrigeration, dehumidification, and humidification, stable control of temperature and humidity inside the chamber is achieved.

[0004] In the process of implementing the embodiments of this disclosure, it was found that the related technology has at least the following technical problems: The main evaporator (i.e., the refrigeration evaporator) of a constant temperature and humidity chamber may exhibit a hidden dehumidification effect during the refrigeration process, which can lead to inaccurate humidity control. For example, when the chamber is in refrigeration mode and humidification is activated, some of the moisture output from the humidifier is offset by the hidden dehumidification effect of the main evaporator, causing the humidity to fail to reach the set value for an extended period. Another example is when the humidity inside the chamber exceeds the set value, humidification should immediately stop and the dehumidifying evaporator should be activated. However, if the main evaporator has a hidden dehumidification function, this creates a double dehumidification effect, causing the humidity inside the chamber to drop rapidly below the set value. The chamber will then restart humidification, and this cycle repeats, causing violent fluctuations in the humidity curve and poor control stability. Therefore, improving the stability of humidity control in constant temperature and humidity chambers has become a pressing technical problem that needs to be solved.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a control method and control device for a constant temperature and humidity chamber, and a constant temperature and humidity chamber, which can improve the stability of humidity function control in the constant temperature and humidity chamber.

[0008] In some embodiments, a control method for a constant temperature and humidity chamber includes: acquiring the chamber's internal temperature, internal humidity, and surface temperature of the main evaporator; calculating the dew point temperature based on the internal temperature and internal humidity; determining whether the main evaporator has a concealed dehumidification function based on the surface temperature and dew point temperature; and, if a concealed dehumidification function exists, controlling the constant temperature and humidity chamber to execute a preset optimized control logic in terms of humidity function.

[0009] Optionally, the dew point temperature is calculated based on the temperature and humidity inside the chamber, including: calculating the saturated vapor pressure inside the chamber based on the temperature inside the chamber; calculating the actual vapor pressure inside the chamber based on the humidity and saturated vapor pressure inside the chamber; and calculating the dew point temperature based on the actual vapor pressure.

[0010] Alternatively, the dew point temperature can be calculated based on the actual water vapor pressure using the following expression: ; in, Here, is the dew point temperature, and e is the actual water vapor pressure.

[0011] Optionally, the presence or absence of a concealed dehumidification function of the main evaporator can be determined based on its surface temperature and dew point temperature, including: determining that the main evaporator has a concealed dehumidification function when its surface temperature is lower than the dew point temperature; and determining that the main evaporator does not have a concealed dehumidification function when its surface temperature is greater than or equal to the dew point temperature.

[0012] Optionally, in cases where concealed dehumidification exists, the constant temperature and humidity chamber is controlled to execute preset optimized control logic in terms of humidity function, including: when the constant temperature and humidity chamber is in cooling temperature control mode and humidification mode, limiting the maximum output value of the integral term of the PID humidity control algorithm and increasing the output power of the humidification device of the constant temperature and humidity chamber; when the constant temperature and humidity chamber is in humidity overshoot mode, increasing the switching threshold for switching from humidification mode to dehumidification mode.

[0013] Optionally, the maximum output value of the integral term of the PID humidity control algorithm can be limited by: setting the upper limit of the output value of the integral term of the PID humidity control algorithm to 50% of the maximum output value of the standard PID integral term, and stopping the accumulation of error terms in the PID humidity control algorithm.

[0014] Optionally, the switching threshold for switching from humidification mode to dehumidification mode can be increased, including adjusting the switching threshold for humidity overshoot to ±2.5%RH, and stopping only the humidification device and not starting the dehumidification evaporator before the switching threshold is reached.

[0015] In some embodiments, a control device for a constant temperature and humidity chamber includes: an acquisition module for acquiring the chamber's internal temperature, internal humidity, and surface temperature of the main evaporator; a calculation module for calculating the dew point temperature based on the chamber's internal temperature and internal humidity; a determination module for determining whether the main evaporator has a concealed dehumidification function based on the surface temperature and dew point temperature; and a control module for controlling the constant temperature and humidity chamber to execute preset optimized control logic in terms of humidity function when a concealed dehumidification function exists.

[0016] In some embodiments, a control device for a constant temperature and humidity chamber includes a processor and a memory storing program instructions, the processor being configured to execute the control method for a constant temperature and humidity chamber as described above when the program instructions are executed.

[0017] In some embodiments, a constant temperature and humidity chamber includes: a chamber body; and a control device for a constant temperature and humidity chamber as described above, disposed in the chamber body.

[0018] The control method and control device for a constant temperature and humidity chamber, and the constant temperature and humidity chamber provided in this disclosure can achieve the following technical effects: In this embodiment, during the operation of the constant temperature and humidity chamber, the internal temperature, internal humidity, and surface temperature of the main evaporator are acquired, and the dew point temperature is calculated based on the internal temperature and humidity. Then, the surface temperature and dew point temperature of the main evaporator are compared to determine whether the main evaporator has a concealed dehumidification function. If a concealed dehumidification function exists, the humidity function of the constant temperature and humidity chamber is controlled to execute a preset optimized control logic. This ensures that the control of humidification or dehumidification within the chamber takes into account the dehumidification capacity of the main evaporator, reducing the risk of repeated humidification and dehumidification operations. Therefore, this embodiment improves the stability of the humidity function control in the constant temperature and humidity chamber.

[0019] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0020] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein: Figure 1 This is a schematic diagram of a constant temperature and humidity chamber provided in an embodiment of this disclosure; Figure 2 This is a schematic diagram of a refrigeration system for a constant temperature and humidity chamber provided in an embodiment of this disclosure; Figure 3This is a schematic diagram of a control method for a constant temperature and humidity chamber provided in an embodiment of this disclosure; Figure 4 This is a schematic diagram of another control method for a constant temperature and humidity chamber provided in an embodiment of this disclosure; Figure 5 This is a schematic diagram of another control method for a constant temperature and humidity chamber provided in an embodiment of this disclosure; Figure 6 This is a schematic diagram of a control device for a constant temperature and humidity chamber provided in an embodiment of this disclosure; Figure 7 This is a schematic diagram of another control device for a constant temperature and humidity chamber provided in an embodiment of this disclosure. Detailed Implementation

[0021] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0022] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0023] Unless otherwise stated, the term "multiple" means two or more features.

[0024] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, the A / B feature means: A or B.

[0025] The term "and / or" describes an association between objects, and the feature indicates that there can be three relationships. For example, A and / or B, the feature indicates three relationships: A or B, or A and B.

[0026] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0028] Combination Figure 1 As shown, this embodiment of the disclosure provides a constant temperature and humidity chamber 100, including: a chamber body 110 and a control device 600 (700) for the constant temperature and humidity chamber. The control device 600 (700) for the constant temperature and humidity chamber is disposed in the chamber body 110.

[0029] Optionally, such as Figure 2 As shown, the refrigeration system 120 of the constant temperature and humidity chamber includes: a compressor 121, a condenser 122, a refrigeration expansion valve 123, a main evaporator 124, a dehumidification solenoid valve 125, and a dehumidification evaporator 126. The compressor 121, condenser 122, refrigeration expansion valve 123, and main evaporator 124 can form one refrigerant flow path; the compressor 121, condenser 122, dehumidification solenoid valve 125, and dehumidification evaporator 126 can form another refrigerant flow path.

[0030] Optionally, the control device 700 for the constant temperature and humidity chamber includes a processor. During the operation of the constant temperature and humidity chamber, the processor can acquire the internal temperature, internal humidity, and surface temperature of the main evaporator of the chamber, and calculate the dew point temperature based on the internal temperature and humidity. After determining the dew point temperature, the processor can compare the surface temperature of the main evaporator with the dew point temperature to determine whether the main evaporator has a concealed dehumidification function. If a concealed dehumidification function exists, the processor will control the constant temperature and humidity chamber to execute preset optimized control logic in terms of humidity function.

[0031] In conjunction with the aforementioned constant temperature and humidity control chamber, this disclosure provides a control method for a constant temperature and humidity chamber, wherein the executing entity of this control method can be the aforementioned processor. Figure 3 As shown, the control methods include: S301, the processor obtains the internal temperature, internal humidity, and surface temperature of the main evaporator of the constant temperature and humidity chamber.

[0032] Specifically, a humidity sensor and a first temperature sensor are installed inside the constant temperature and humidity chamber, and a second temperature sensor is installed on the surface of the main evaporator. The processor can collect the temperature inside the chamber through the first temperature sensor, the humidity inside the chamber through the humidity sensor, and the surface temperature of the main evaporator through the second temperature sensor.

[0033] S302, the processor calculates the dew point temperature based on the internal temperature and humidity of the chamber.

[0034] Specifically, dew point temperature represents the temperature at which air reaches saturation through cooling, assuming a constant moisture content in the air. Calculating the dew point temperature helps determine whether condensation will occur under current chamber temperature and humidity conditions, thus allowing for an assessment of the dehumidification effect of the main evaporator.

[0035] S303, the processor determines whether the main evaporator has a concealed dehumidification function based on the surface temperature and dew point temperature of the main evaporator.

[0036] Specifically, concealed dehumidification refers to the phenomenon where, during the refrigeration process, the surface temperature of the main evaporator is lower than the dew point temperature, causing water vapor in the air inside the chamber to condense or liquefy on the surface of the main evaporator, thereby indirectly reducing the humidity inside the chamber.

[0037] Specifically, by comparing the surface temperature and dew point temperature of the main evaporator, it can be determined whether the air inside the chamber will reach saturation due to the temperature drop, condensing or liquefying into water and adhering to the surface of the main evaporator, thereby reducing the water vapor content in the air inside the chamber. Therefore, based on the surface temperature and dew point temperature of the main evaporator, the processor can determine whether the main evaporator has a concealed dehumidification function.

[0038] Optionally, the presence or absence of a concealed dehumidification function of the main evaporator can be determined based on its surface temperature and dew point temperature, including: determining that the main evaporator has a concealed dehumidification function when its surface temperature is lower than the dew point temperature; and determining that the main evaporator does not have a concealed dehumidification function when its surface temperature is greater than or equal to the dew point temperature.

[0039] Specifically, if the surface temperature of the main evaporator is lower than the dew point temperature, it indicates that the air inside the chamber will reach saturation upon contact with the surface of the main evaporator due to the temperature drop, causing condensation or liquefaction into water that adheres to the surface of the main evaporator and leads to a decrease in humidity inside the chamber. Therefore, in this case, it can be determined that the main evaporator has a concealed dehumidification function.

[0040] Specifically, if the surface temperature of the main evaporator is greater than or equal to the dew point temperature, it indicates that the air inside the chamber will not reach saturation due to the temperature drop when in contact with the surface of the main evaporator. Condensation will not form on the surface of the main evaporator, nor will water liquefy, and the humidity inside the chamber will not decrease. Therefore, in this case, it can be determined that the main evaporator does not have a concealed dehumidification function.

[0041] S304, the processor controls the constant temperature and humidity chamber to execute preset optimized control logic in terms of humidity function when there is a concealed dehumidification function.

[0042] Specifically, after determining that the main evaporator has a concealed dehumidification function, the control of dehumidification or humidification inside the chamber can be optimized by using preset optimized control logic, avoiding repeated humidification and dehumidification.

[0043] Specifically, the optimization control logic for a constant temperature and humidity chamber differs depending on its operating conditions. For example, when the chamber is in humidification mode, the humidification capacity of the humidification device can be increased to account for the portion dehumidified by the main evaporator. Conversely, when the chamber is in dehumidification mode, the dehumidification capacity of the dehumidification evaporator can be reduced to account for the portion dehumidified by the main evaporator.

[0044] In this embodiment, during the operation of the constant temperature and humidity chamber, the internal temperature, internal humidity, and surface temperature of the main evaporator are acquired, and the dew point temperature is calculated based on the internal temperature and humidity. Then, the surface temperature and dew point temperature of the main evaporator are compared to determine whether the main evaporator has a concealed dehumidification function. If a concealed dehumidification function exists, the humidity function of the constant temperature and humidity chamber is controlled to execute a preset optimized control logic. This ensures that the control of humidification or dehumidification within the chamber takes into account the dehumidification capacity of the main evaporator, reducing the risk of repeated humidification and dehumidification operations. Therefore, this embodiment improves the stability of the humidity function control in the constant temperature and humidity chamber.

[0045] In some embodiments, calculating the dew point temperature based on the chamber temperature and humidity includes: calculating the saturated vapor pressure inside the chamber based on the chamber temperature; calculating the actual vapor pressure inside the chamber based on the chamber humidity and saturated vapor pressure; and calculating the dew point temperature based on the actual vapor pressure.

[0046] Specifically, saturated vapor pressure is an indicator that measures the maximum amount of water vapor that air can hold at a specific temperature. Calculating the saturated vapor pressure inside the chamber is to subsequently determine the vapor pressure that the air would have when it reaches saturation at the current chamber temperature.

[0047] Optionally, the saturated vapor pressure inside the chamber can be calculated based on the internal temperature using the following expression: ; in, Let be the saturated vapor pressure inside the chamber, t be the temperature inside the chamber, and exp be the natural exponential function.

[0048] Specifically, actual vapor pressure refers to the pressure generated by the actual water vapor present in the air inside the chamber.

[0049] Optionally, the actual water vapor pressure inside the chamber can be calculated based on the humidity and saturated water vapor pressure inside the chamber, according to the following expression: ; in, This represents the actual water vapor pressure inside the chamber. ρ is the saturated water vapor pressure inside the chamber, and rh is the humidity inside the chamber, specifically the relative humidity.

[0050] Alternatively, the dew point temperature can be calculated based on the actual water vapor pressure using the following expression: ; in, Here, is the dew point temperature, and e is the actual water vapor pressure.

[0051] In this embodiment, the dew point temperature is calculated by comparing the saturated vapor pressure and the actual vapor pressure inside the chamber. This helps improve the accuracy of the determined dew point temperature.

[0052] This disclosure provides another control method for a constant temperature and humidity chamber, combined with... Figure 4 As shown, the control methods include: S401, the processor obtains the internal temperature, internal humidity, and surface temperature of the main evaporator of the constant temperature and humidity chamber.

[0053] S402, the processor calculates the dew point temperature based on the internal temperature and humidity of the chamber.

[0054] S403, the processor determines whether the main evaporator has a concealed dehumidification function based on the surface temperature and dew point temperature of the main evaporator.

[0055] S404, when the processor is in a concealed dehumidification mode, the constant temperature and humidity chamber is in cooling temperature control mode and humidification mode, limits the maximum output value of the integral term of the PID humidity control algorithm, and increases the output power of the humidification device of the constant temperature and humidity chamber.

[0056] Specifically, when the constant temperature and humidity chamber is in cooling and humidification mode, if the main evaporator has a concealed dehumidification function, the humidification output of the chamber's humidification device will be partially offset by this function, causing the humidity to fail to reach the set value for an extended period. In this situation, the PID humidity control algorithm used by the chamber will continuously accumulate errors, leading to excessively high integral output and integral saturation. This, in turn, causes severe overshooting in the subsequent humidity control logic, making it difficult to stabilize and affecting humidity control accuracy. Therefore, in this case, the maximum output value of the PID humidity control algorithm's integral term is limited, and the output power of the chamber's humidification device is increased.

[0057] Optionally, the maximum output value of the integral term of the PID humidity control algorithm can be limited by: setting the upper limit of the output value of the integral term of the PID humidity control algorithm to 50% of the maximum output value of the standard PID integral term, and stopping the accumulation of error terms in the PID humidity control algorithm.

[0058] Understandably, once the humidity in the cabinet rises to the first set value, for example, ±2%RH, the cooling temperature control mode is exited. After humidification stops, this optimized control strategy can be exited, and the standard PID humidity control algorithm can be restored.

[0059] In this embodiment, when the main evaporator has a concealed dehumidification function, if the constant temperature and humidity chamber is in cooling temperature control mode and humidification mode, the maximum output value of the integral term of the PID humidity control algorithm will be limited, and the output power of the humidification device of the constant temperature and humidity chamber will be increased. This avoids the continuous accumulation of errors in the PID humidity control algorithm and improves the stability of the humidity control function of the constant temperature and humidity chamber.

[0060] This disclosure provides another control method for a constant temperature and humidity chamber, combined with... Figure 5 As shown, the control methods include: S501, the processor obtains the internal temperature, internal humidity and surface temperature of the main evaporator of the constant temperature and humidity chamber.

[0061] The S502 processor calculates the dew point temperature based on the internal temperature and humidity of the chamber.

[0062] S503, the processor determines whether the main evaporator has a concealed dehumidification function based on the surface temperature and dew point temperature of the main evaporator.

[0063] S504: When the processor is in a state of humidity overshooting in the constant temperature and humidity chamber, it increases the switching threshold for switching from humidification mode to dehumidification mode, even when there is a hidden dehumidification function.

[0064] Specifically, humidity overshoot refers to the humidity inside the chamber exceeding the set value. Under this condition, when the main evaporator has a concealed dehumidification function, if the humidification mode is switched to dehumidification mode according to the conventional switching threshold, the humidity may quickly drop below the set value again due to the concealed dehumidification function, causing frequent mode switching and resulting in unstable humidity inside the constant temperature and humidity chamber. Increasing the switching threshold can avoid this situation, ensuring that the chamber only switches to dehumidification mode when the humidity exceeds the set value significantly, thus reducing the number of mode switching occurrences.

[0065] Optionally, the switching threshold for switching from humidification mode to dehumidification mode can be increased, including adjusting the switching threshold for humidity overshoot to ±2.5%RH, and stopping only the humidification device and not starting the dehumidification evaporator before the switching threshold is reached.

[0066] Understandably, once the humidity in the cabinet drops to the second set value, for example, ±0.5%RH, the humidity overshoot disappears, and the optimized control strategy can be exited, and the switching threshold for switching from standard humidification mode to dehumidification mode can be used.

[0067] In this embodiment, when the main evaporator has a concealed dehumidification function, if the constant temperature and humidity chamber is in a humidity overshoot condition, the switching threshold for switching from humidification mode to dehumidification mode will be increased. This avoids the constant temperature and humidity chamber repeatedly performing humidification and dehumidification functions, improving the stability of humidity control within the chamber.

[0068] Combination Figure 6 As shown, this disclosure provides a control device 600 for a constant temperature and humidity chamber, including: an acquisition module 601, a calculation module 602, a determination module 603, and a control module 604. The acquisition module 601 acquires the internal temperature, internal humidity, and surface temperature of the main evaporator of the constant temperature and humidity chamber. The calculation module 602 calculates the dew point temperature based on the internal temperature and humidity. The determination module 603 determines whether the main evaporator has a concealed dehumidification function based on the surface temperature and dew point temperature. The control module 604, when a concealed dehumidification function is present, controls the constant temperature and humidity chamber to execute preset optimized control logic in terms of humidity function.

[0069] Combination Figure 7 As shown, this disclosure provides a control device 700 for a constant temperature and humidity chamber, including a processor 701 and a memory 702. Optionally, the device may further include a communication interface 703 and a bus 704. The processor 701, communication interface 703, and memory 702 can communicate with each other via the bus 704. The communication interface 703 can be used for information transmission. The processor 701 can call logical instructions in the memory 702 to execute the control method for the constant temperature and humidity chamber described in the above embodiment.

[0070] Furthermore, the logic instructions in the aforementioned memory 702 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0071] The memory 702, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 701 executes functional applications and data processing by running the program instructions / modules stored in the memory 702, thereby implementing the control method for the constant temperature and humidity chamber in the above embodiments.

[0072] The memory 702 may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 702 may include high-speed random access memory and may also include non-volatile memory.

[0073] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to execute the above-described control method for a constant temperature and humidity chamber.

[0074] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, such as a USB flash drive, external hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, etc., and other media capable of storing program code.

[0075] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0076] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0077] The methods and products disclosed in the embodiments herein (including but not limited to devices and equipment) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0078] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A control method for a constant temperature and humidity chamber, characterized in that, include: Obtain the internal temperature, internal humidity, and surface temperature of the main evaporator of the constant temperature and humidity chamber. Calculate the dew point temperature based on the temperature and humidity inside the chamber. Determine whether the main evaporator has a concealed dehumidification function based on the surface temperature and dew point temperature of the main evaporator; In cases where a concealed dehumidification function exists, the humidity control chamber executes a preset optimized control logic.

2. The control method according to claim 1, characterized in that, Calculate the dew point temperature based on the internal temperature and humidity of the chamber, including: Calculate the saturated vapor pressure inside the chamber based on the internal temperature. Calculate the actual water vapor pressure inside the chamber based on the humidity and saturated water vapor pressure inside the chamber; Calculate the dew point temperature based on the actual water vapor pressure.

3. The control method according to claim 2, characterized in that, Calculate the dew point temperature based on the actual water vapor pressure using the following expression: ； in, Here, is the dew point temperature, and e is the actual water vapor pressure.

4. The control method according to claim 1, characterized in that, Determine whether the main evaporator has a concealed dehumidification function based on its surface temperature and dew point temperature, including: When the surface temperature of the main evaporator is lower than the dew point temperature, it is determined that the main evaporator has a concealed dehumidification function; If the surface temperature of the main evaporator is greater than or equal to the dew point temperature, it is determined that the main evaporator does not have a concealed dehumidification function.

5. The control method according to claim 1, characterized in that, In cases where concealed dehumidification exists, the humidity control function of the constant temperature and humidity chamber executes preset optimized control logic, including: When the constant temperature and humidity chamber is in cooling temperature control mode and humidification mode, limit the maximum output value of the integral term of the PID humidity control algorithm and increase the output power of the humidification device of the constant temperature and humidity chamber. When the constant temperature and humidity chamber is in a state of humidity overshoot, increase the switching threshold for switching from humidification mode to dehumidification mode.

6. The control method according to claim 5, characterized in that, Limit the maximum output value of the integral term of the PID humidity control algorithm, including: Set the upper limit of the integral term output of the PID humidity control algorithm to 50% of the maximum output value of the standard PID integral term, and stop the accumulation of error terms in the PID humidity control algorithm.

7. The control method according to claim 5, characterized in that, Increase the switching threshold for humidification mode to dehumidification mode, including: Adjust the humidity overshoot switching threshold to ±2.5%RH, and before reaching the switching threshold, only stop the humidifier and do not start the dehumidifier evaporator.

8. A control device for a constant temperature and humidity chamber, characterized in that, include: The acquisition module is used to acquire the internal temperature, internal humidity, and surface temperature of the main evaporator of the constant temperature and humidity chamber. The calculation module is used to calculate the dew point temperature based on the internal temperature and humidity of the chamber. The determination module is used to determine whether the main evaporator has a concealed dehumidification function based on the surface temperature and dew point temperature of the main evaporator. The control module is used to control the constant temperature and humidity chamber to execute preset optimized control logic in terms of humidity function when there is a concealed dehumidification function.

9. A control device for a constant temperature and humidity chamber, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute, when running the program instructions, the control method for a constant temperature and humidity chamber as described in any one of claims 1 to 7.

10. A constant temperature and humidity chamber, characterized in that, include: Box; The control device for a constant temperature and humidity chamber as described in claim 8 or 9 is disposed in the chamber body.

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