A grow environment light-off responsive control dehumidifying apparatus and method

Abstract

The application relates to a kind of planting environment light-off response control dehumidification device and method, a kind of planting environment light-off response control dehumidification device includes: shell, shell is equipped with air inlet and air outlet, air inlet and air outlet form air treatment channel, refrigeration circuit, setting in shell, the air that passes through air treatment channel is cooled and dehumidified and reheated treatment, variable frequency fan, setting in air treatment channel, drive the air in planting environment by air inlet into shell, after flowing through refrigeration circuit, by air outlet, detection component, setting on shell and refrigeration circuit, for detecting the air state parameter that enters shell and the operating state parameter of refrigeration circuit, and controller, respectively with refrigeration circuit, variable frequency fan and detection component electric connection, for determining the light-off switching state of planting environment according to the air state parameter detected by detection component, and when determining light-off switching state, adjust the dehumidification capacity of refrigeration circuit and the operating speed of variable frequency fan.

Description

Technical Field

[0001] This invention relates to the technical field of planting environment control, and in particular to a planting environment light-off response control dehumidification device and method. Background Technology

[0002] In greenhouses, plant factories, and other growing environments, dehumidifiers are typically used to regulate air humidity and maintain a suitable environment for plant growth. When the growing environment is switched from being lit to being lit, the heat dissipation from the light source decreases, and the air temperature drops rapidly, leading to an increase in relative humidity and a decrease in vapor pressure difference. This can easily cause humidity overshoot and condensation.

[0003] Existing dehumidifiers typically adjust based on the deviation of temperature, relative humidity, or vapor pressure difference from corresponding target values. The dehumidifier only increases its dehumidification capacity when the detected parameters significantly deviate from the target value, resulting in a control response lag. Furthermore, a single control loop cannot simultaneously account for changes in both the growing environment parameters and the evaporation temperature of the refrigeration circuit, easily leading to over-adjustment or operational fluctuations. Summary of the Invention

[0004] To address the issues of lag in response of existing dehumidifiers during the switching off of lights in the planting environment, which can easily lead to humidity overshoot and control fluctuations, this application provides a dehumidifier and method for responding to the switching off of lights in the planting environment.

[0005] The above-mentioned objective of this application is achieved through the following technical solution:

[0006] A dehumidification device for a growing environment that responds to light-off conditions, the device comprising:

[0007] The housing has an air inlet and an air outlet, and an air handling channel is formed between the air inlet and the air outlet;

[0008] A refrigeration circuit, located inside the housing, is used to cool, dehumidify, and reheat the air flowing through the air handling channel.

[0009] A variable frequency fan is installed in the air handling channel to drive air in the planting environment to enter the housing through the air inlet, flow through the refrigeration circuit and be discharged through the air outlet.

[0010] A detection component, disposed on the housing and the refrigeration circuit, is used to detect the air state parameters entering the housing and the operating state parameters of the refrigeration circuit; and

[0011] The controller is electrically connected to the refrigeration circuit, the variable frequency fan, and the detection component, respectively, and is used to determine the light-off switching state of the planting environment based on the air state parameters detected by the detection component, and to adjust the dehumidification capacity of the refrigeration circuit and the operating speed of the variable frequency fan when the light-off switching state is determined.

[0012] By adopting the above technical solution, the variable frequency fan drives the air in the planting environment to flow through the air handling channel, so that the refrigeration circuit cools, dehumidifies and reheats the air. The detection component detects the air state parameters and operating state parameters. The controller determines the switching state of the planting environment when the lights are turned off in a timely manner based on the air state parameters, and adjusts the dehumidification capacity of the refrigeration circuit and the operating speed of the variable frequency fan accordingly. This improves the response speed of the dehumidification device to changes in air state during the lights-off process, reduces humidity overshoot and condensation, and improves the stability of dehumidification control.

[0013] Preferably, the refrigeration circuit includes a variable frequency compressor, a condenser, an electronic expansion valve, and an evaporator, wherein the variable frequency compressor, the condenser, the electronic expansion valve, and the evaporator are connected in sequence via refrigerant pipelines;

[0014] The evaporator and the condenser are arranged sequentially in the air handling channel along the air flow direction, so that the air entering the housing is first cooled and dehumidified by the evaporator, then reheated by the condenser and discharged from the air outlet.

[0015] By adopting the above technical solution, the variable frequency compressor, condenser, electronic expansion valve, and evaporator form a continuously connected refrigeration circuit, enabling stable refrigerant circulation. Air is first cooled and dehumidified by the evaporator, then reheated by the condenser. This reduces the air's moisture content while increasing the outlet air temperature, preventing low-temperature air from being directly discharged into the planting environment. The reheating process utilizes the heat released by the condenser, thereby improving dehumidification efficiency and the operational stability of the refrigeration circuit.

[0016] Preferably, the detection component includes:

[0017] An air inlet temperature sensor is installed at the air inlet to detect the air inlet temperature entering the housing.

[0018] An air intake humidity sensor is installed at the air intake to detect the relative humidity of the air entering the housing.

[0019] An evaporation temperature sensor is installed on the evaporator to detect the actual evaporation temperature of the evaporator.

[0020] By adopting the above technical solution, the inlet air temperature sensor and the inlet air humidity sensor detect the inlet air temperature and relative humidity, respectively, providing data for calculating the inlet air vapor pressure difference and determining the light-off switching state of the planting environment. The evaporation temperature sensor detects the actual evaporation temperature, providing data for adjusting the dehumidification capacity of the refrigeration circuit, thereby improving the accuracy of the light-off switching state judgment and the stability of dehumidification control.

[0021] Preferably, the controller includes:

[0022] A vapor pressure difference calculation module is connected to the inlet air temperature sensor and the inlet air humidity sensor respectively, and is used to calculate the inlet air vapor pressure difference based on the inlet air temperature and the inlet air relative humidity;

[0023] The light-off switching detection module is connected to the vapor pressure difference calculation module. It is used to determine the temperature drop rate based on the inlet air temperature, the vapor pressure difference drop rate based on the inlet air vapor pressure difference, and the light-off switching state of the planting environment based on the temperature drop rate and the vapor pressure difference drop rate.

[0024] A feedforward adjustment module, connected to the light-off switching detection module, is used to generate a feedforward adjustment amount when the light-off switching state is determined;

[0025] The cascaded PID control module includes a main PID controller and a secondary PID controller. The main PID controller is connected to the vapor pressure difference calculation module and is used to generate a feedback adjustment quantity based on the target vapor pressure difference and the inlet vapor pressure difference. The secondary PID controller is connected to the evaporation temperature sensor and is used to generate a compressor frequency adjustment quantity based on the target evaporation temperature and the actual evaporation temperature.

[0026] The actuator coordination module is connected to the feedforward adjustment module, the cascade PID control module, the variable frequency compressor, the electronic expansion valve, and the variable frequency fan, respectively. It is used to superimpose the feedforward adjustment amount and the feedback adjustment amount to obtain a comprehensive adjustment amount, determine the target evaporation temperature based on the comprehensive adjustment amount, adjust the operating frequency of the variable frequency compressor based on the compressor frequency adjustment amount, and coordinate the opening degree of the electronic expansion valve and the operating speed of the variable frequency fan based on the comprehensive adjustment amount.

[0027] By adopting the above technical solution, the inlet air vapor pressure difference is calculated using the inlet air temperature and relative humidity. Combined with the temperature drop rate and vapor pressure difference drop rate, the light-off switching state of the planting environment is determined, improving the accuracy of the light-off switching state judgment. By superimposing the feedforward and feedback adjustment quantities to obtain a comprehensive adjustment quantity, and using a main PID controller and a secondary PID controller to adjust the inlet air vapor pressure difference and actual evaporation temperature respectively, the response speed and adjustment accuracy of dehumidification control can be improved. By coordinating the operation frequency of the variable frequency compressor, the opening degree of the electronic expansion valve, and the operating speed of the variable frequency fan, control fluctuations can be reduced, and the operational stability of the refrigeration circuit can be improved.

[0028] A method for dehumidifying a planting environment in response to light-off conditions, applied to a dehumidifying device for planting environments in response to light-off conditions, the method comprising:

[0029] Obtain the inlet air temperature and inlet air relative humidity, and calculate the inlet air vapor pressure difference based on the inlet air temperature and inlet air relative humidity;

[0030] The rate of temperature decrease is calculated based on the inlet air temperature, and the rate of vapor pressure decrease is calculated based on the inlet air vapor pressure difference.

[0031] When the temperature drop rate reaches a preset temperature rate threshold and the vapor pressure difference drop rate reaches a preset vapor pressure difference rate threshold, it is determined that the planting environment is in a light-off switching state.

[0032] When the planting environment is in a light-off switching state, a feedforward adjustment amount is generated based on the temperature drop rate and the vapor pressure difference drop rate.

[0033] The vapor pressure difference deviation is calculated based on the target vapor pressure difference and the inlet vapor pressure difference. A feedback adjustment amount is generated based on the vapor pressure difference deviation. The feedback adjustment amount is then superimposed with the feedforward adjustment amount to obtain the comprehensive adjustment amount.

[0034] The target evaporation temperature is determined based on the comprehensive adjustment amount, the actual evaporation temperature is obtained, and the dehumidification capacity of the refrigeration circuit is adjusted based on the target evaporation temperature and the actual evaporation temperature.

[0035] After a preset feedforward duration has elapsed since the planting environment is determined to be in the light-off switching state, the feedforward adjustment amount is gradually reduced to zero.

[0036] By employing the above technical solution, the accuracy of the light-off switching state in the planting environment can be improved by jointly determining the temperature drop rate and the vapor pressure difference drop rate. During the light-off switching state, a feedforward adjustment quantity is generated, and this quantity is superimposed with the feedback adjustment quantity to obtain a comprehensive adjustment quantity. This allows for early response to changes in inlet air temperature and inlet vapor pressure difference, improving the response speed of dehumidification control. The target evaporation temperature is determined based on the comprehensive adjustment quantity, and the dehumidification capacity of the refrigeration circuit is adjusted according to the actual evaporation temperature, improving the stability of dehumidification control. After a preset feedforward action time, the feedforward adjustment quantity is gradually reduced to zero, achieving a smooth transition between feedforward and feedback adjustment, reducing humidity overshoot and control fluctuations.

[0037] Preferably, the step of determining that the planting environment is in a light-off switching state includes:

[0038] Determine whether the rate of temperature decrease reaches a preset temperature rate threshold, and determine whether the rate of vapor pressure difference decrease reaches a preset vapor pressure difference rate threshold;

[0039] If the rate of temperature decrease reaches the preset temperature rate threshold and the rate of vapor pressure decrease reaches the preset vapor pressure difference rate threshold, and this continues for a preset confirmation time, then it is determined that the planting environment is in a light-off switching state.

[0040] By adopting the above technical solution, using both the rate of temperature decrease and the rate of vapor pressure decrease for dual judgment, and continuously confirming the judgment result through a preset confirmation time, it is possible to reduce misjudgments caused by short-term fluctuations in air state parameters and improve the accuracy and reliability of the judgment of the light-off switching state.

[0041] Preferably, the step of generating the feedforward adjustment amount based on the temperature decrease rate and the vapor pressure difference decrease rate includes:

[0042] A temperature feedforward adjustment component is generated based on the temperature drop rate and the preset temperature feedforward gain coefficient.

[0043] A vapor pressure difference feedforward adjustment component is generated based on the vapor pressure difference decrease rate and the preset vapor pressure difference feedforward gain coefficient;

[0044] The feedforward adjustment component is obtained by superimposing the temperature feedforward adjustment component and the vapor pressure difference feedforward adjustment component.

[0045] By adopting the above technical solution, corresponding feedforward adjustment components are generated according to the rate of temperature decrease and the rate of vapor pressure decrease, respectively. The two feedforward adjustment components are superimposed to obtain the feedforward adjustment amount, so that the feedforward adjustment amount can simultaneously reflect the degree of decrease of the inlet air temperature and the inlet air vapor pressure difference, thereby improving the response speed and adaptability of dehumidification control during the light-off switching process.

[0046] Preferably, the step of determining the target evaporation temperature based on the comprehensive adjustment amount, obtaining the actual evaporation temperature, and adjusting the dehumidification capacity of the refrigeration circuit based on the target evaporation temperature and the actual evaporation temperature includes:

[0047] The vapor pressure difference deviation is input into the main PID controller, which then generates the feedback adjustment quantity.

[0048] The combined adjustment amount is obtained by superimposing the feedback adjustment amount and the feedforward adjustment amount;

[0049] The target evaporation temperature is determined based on the comprehensive adjustment amount;

[0050] Calculate the evaporation temperature deviation based on the actual evaporation temperature and the target evaporation temperature;

[0051] The evaporation temperature deviation is input into the secondary PID controller, which then generates the compressor frequency adjustment.

[0052] The operating frequency of the variable frequency compressor is adjusted according to the compressor frequency adjustment amount.

[0053] By adopting the above technical solution, the main PID controller generates a feedback adjustment quantity based on the vapor pressure difference deviation, and then superimposes the feedback adjustment quantity with the feedforward adjustment quantity to obtain a comprehensive adjustment quantity. This allows the target evaporation temperature to respond simultaneously to the vapor pressure difference deviation and the lamp-off switching process. The secondary PID controller generates a compressor frequency adjustment quantity based on the evaporation temperature deviation, enabling the actual evaporation temperature to follow the target evaporation temperature change. This improves the adjustment accuracy of the variable frequency compressor's operating frequency and reduces the lag and fluctuations in dehumidification control.

[0054] Preferably, the step of adjusting the operating frequency of the variable frequency compressor (21) according to the compressor frequency adjustment amount further includes:

[0055] Determine whether the target evaporation temperature has reached the boundary value of the preset evaporation temperature range, and determine whether the operating frequency of the variable frequency compressor has reached the boundary value of the preset operating frequency range.

[0056] When the target evaporation temperature reaches the boundary value of the preset evaporation temperature range, and the adjustment direction of the main PID controller is to make the target evaporation temperature exceed the preset evaporation temperature range, the accumulation of the integral term of the main PID controller is stopped.

[0057] When the operating frequency of the variable frequency compressor reaches the boundary value of the preset operating frequency range, and the adjustment direction of the sub-PID controller is to make the operating frequency of the variable frequency compressor exceed the preset operating frequency range, the accumulation of the integral term of the sub-PID controller is stopped.

[0058] When the target evaporation temperature recovers to the preset evaporation temperature range, the integral term accumulation of the main PID controller is restored;

[0059] When the operating frequency of the variable frequency compressor returns to the preset operating frequency range, the integral term accumulation of the secondary PID controller is restored.

[0060] By adopting the above technical solution, when the target evaporation temperature or the operating frequency of the variable frequency compressor reaches the boundary value of the corresponding range, and the adjustment direction continues to exceed the corresponding range, the accumulation of the integral term stops, thus avoiding over-adjustment caused by the continued accumulation of the integral term. When the target evaporation temperature or operating frequency returns to the corresponding range, the accumulation of the integral term resumes, which can improve the recovery speed of the main PID controller and the auxiliary PID controller, and reduce control overshoot and operating fluctuations.

[0061] Preferably, the step of gradually reducing the feedforward adjustment amount to zero includes:

[0062] The timing begins when the planting environment is confirmed to be in a lights-off switching state.

[0063] When the timing duration does not reach the preset feedforward duration, the feedforward adjustment amount is maintained;

[0064] When the timing duration reaches the preset feedforward duration, the feedforward adjustment amount is gradually reduced to zero according to a preset exponential decay law.

[0065] By adopting the above technical solution, maintaining the feedforward adjustment after the lights-off switching state begins ensures that the feedforward adjustment continues to function within the preset feedforward action duration. After the preset feedforward action duration is reached, the feedforward adjustment gradually decreases to zero according to a preset exponential decay law, which avoids control fluctuations caused by sudden removal or continuous action of the feedforward adjustment, and achieves a smooth transition between feedforward and feedback adjustment.

[0066] In summary, this application includes at least one of the following beneficial technical effects:

[0067] 1. The variable frequency fan drives the air in the planting environment to flow through the air handling channel, so that the refrigeration circuit cools, dehumidifies and reheats the air. The detection component detects the air status parameters and operating status parameters. The controller determines the switching state of the planting environment when the lights are turned off in a timely manner based on the air status parameters, and adjusts the dehumidification capacity of the refrigeration circuit and the operating speed of the variable frequency fan accordingly. This improves the response speed of the dehumidification device to changes in air status during the lights-off process, reduces humidity overshoot and condensation, and improves the stability of dehumidification control.

[0068] 2. Utilizing both the rate of temperature decrease and the rate of vapor pressure decrease to determine the lighting-off switching state of the planting environment improves the accuracy of the lighting-off switching state judgment. During the lighting-off switching state, a feedforward adjustment quantity is generated, and this quantity is superimposed with the feedback adjustment quantity to obtain a comprehensive adjustment quantity. This allows for proactive responses to changes in inlet air temperature and inlet vapor pressure difference, improving the response speed of dehumidification control. Determining the target evaporation temperature based on the comprehensive adjustment quantity, and adjusting the dehumidification capacity of the refrigeration circuit in conjunction with the actual evaporation temperature, improves the stability of dehumidification control. After a preset feedforward action time, the feedforward adjustment quantity is gradually reduced to zero, achieving a smooth transition between feedforward and feedback regulation, reducing humidity overshoot and control fluctuations. Attached Figure Description

[0069] Figure 1 This is a schematic diagram of a dehumidification device for a planting environment that responds to light-off conditions, according to one embodiment of this application.

[0070] Figure 2 This is a schematic diagram of the cooling circuit in one embodiment of this application;

[0071] Figure 3 This is a schematic diagram of the detection component in one embodiment of this application;

[0072] Figure 4 This is a schematic diagram of the controller structure in one embodiment of this application;

[0073] Figure 5 This is a flowchart illustrating the implementation of a dehumidification method for a planting environment that responds to light-off conditions, according to one embodiment of this application.

[0074] Explanation of reference numerals in the attached diagram: 1. Housing; 2. Refrigeration circuit; 21. Variable frequency compressor; 22. Condenser; 23. Electronic expansion valve; 24. Evaporator; 3. Variable frequency fan; 4. Detection components; 41. Inlet air temperature sensor; 42. Inlet air humidity sensor; 43. Evaporation temperature sensor; 5. Controller; 51. Vapor pressure difference calculation module; 52. Light-off switching detection module; 53. Feedforward adjustment module; 54. Cascade PID control module; 55. Actuator coordination module. Detailed Implementation

[0075] The present application will be further described in detail below with reference to the accompanying drawings.

[0076] In one embodiment, such as Figure 1 As shown, this application discloses a dehumidification device for a planting environment that responds to light-off conditions. The dehumidification device for a planting environment that responds to light-off conditions includes:

[0077] Housing 1, housing 1 is provided with an air inlet and an air outlet, and an air handling channel is formed between the air inlet and the air outlet;

[0078] The refrigeration circuit 2, located inside the housing 1, is used to cool, dehumidify, and reheat the air flowing through the air handling channel.

[0079] The variable frequency fan 3 is installed in the air handling channel to drive the air in the planting environment to enter the housing 1 through the air inlet, flow through the cooling circuit 2 and then be discharged through the air outlet.

[0080] Detection component 4, installed on housing 1 and refrigeration circuit 2, is used to detect the air state parameters entering housing 1 and the operating state parameters of refrigeration circuit 2; and

[0081] The controller 5 is electrically connected to the refrigeration circuit 2, the variable frequency fan 3 and the detection component 4 respectively. It is used to determine the light-off switching state of the planting environment based on the air state parameters detected by the detection component 4, and to adjust the dehumidification capacity of the refrigeration circuit 2 and the operating speed of the variable frequency fan 3 when the light-off switching state is determined.

[0082] In this embodiment, the dehumidification device for light-off response control in the planting environment includes a housing 1, a refrigeration circuit 2, a variable frequency fan 3, a detection component 4, and a controller 5. The housing 1 is used to install the refrigeration circuit 2, the variable frequency fan 3, the detection component 4, and the controller 5. The housing 1 is provided with an air inlet and an air outlet. The air inlet is used to allow air from the planting environment to enter the housing 1, and the air outlet is used to allow the treated air to exit the housing 1. An air treatment channel is formed between the air inlet and the air outlet, which is used to allow the air entering the housing 1 to flow from the air inlet to the air outlet.

[0083] The refrigeration circuit 2 is housed within the casing 1 and is used to cool, dehumidify, and reheat the air flowing through the air handling passage. Cooling and dehumidification refers to cooling the air flowing through the air handling passage, causing water vapor in the air to condense; reheating refers to heating the cooled and dehumidified air. The dehumidification capacity of the refrigeration circuit 2 refers to its ability to cool and dehumidify the air flowing through the air handling passage.

[0084] The variable frequency fan 3 is installed in the air handling channel to drive the air in the planting environment into the housing 1 through the air inlet. The air then flows through the refrigeration circuit 2 for cooling, dehumidification, and reheating before being discharged through the air outlet. The operating speed of the variable frequency fan 3 can be adjusted to cooperate with the refrigeration circuit 2 in processing the air flowing through the air handling channel.

[0085] The detection component 4 is installed on the housing 1 and the refrigeration circuit 2 to detect the air state parameters entering the housing 1 and the operating state parameters of the refrigeration circuit 2. The air state parameters include the inlet air temperature and inlet air relative humidity, while the operating state parameters include the actual evaporation temperature. The inlet air temperature refers to the temperature of the air entering the housing 1 through the inlet, the inlet air relative humidity refers to the relative humidity of the air entering the housing 1 through the inlet, and the actual evaporation temperature refers to the evaporation temperature of the evaporator 24 during the operation of the refrigeration circuit 2.

[0086] The controller 5 is electrically connected to the refrigeration circuit 2, the variable frequency fan 3, and the detection component 4, respectively, and is used to acquire the air state parameters and operating state parameters detected by the detection component 4. The controller 5 calculates the inlet air vapor pressure difference based on the inlet air temperature and the inlet air relative humidity, and determines the temperature drop rate based on the inlet air temperature and the vapor pressure difference drop rate based on the inlet air vapor pressure difference.

[0087] The "lights off switching state" refers to the state of the planting environment during the lights-off process, determined by the rate of temperature decrease and the rate of vapor pressure difference decrease. When the rate of temperature decrease reaches a preset temperature rate threshold and the rate of vapor pressure difference decrease reaches a preset vapor pressure difference rate threshold, the controller 5 determines that the planting environment is in the lights-off switching state.

[0088] When the controller 5 determines that the planting environment is in the light-off switching state, the controller 5 adjusts the dehumidification capacity of the refrigeration circuit 2 and the operating speed of the variable frequency fan 3, so that the refrigeration circuit 2 and the variable frequency fan 3 respond to the light-off switching state of the planting environment and perform cooling, dehumidification and reheating treatment on the air flowing through the air handling channel.

[0089] In summary, the dehumidification device for the planting environment with lights off responds to control the airflow through the air handling channel driven by the variable frequency fan 3. The air is cooled, dehumidified, and reheated through the refrigeration circuit 2. The air status parameters and operating status parameters are detected by the detection component 4. The controller 5 determines the switching state of the planting environment with lights off and adjusts the dehumidification capacity of the refrigeration circuit 2 and the operating speed of the variable frequency fan 3.

[0090] Furthermore, in this embodiment, the preset temperature rate threshold and the preset vapor pressure difference rate threshold are set according to the size of the planting environment, the type of crop being planted, and the changes in air conditions before and after the lights are turned off, so as to adapt to the judgment of the switching state when the lights are turned off under different planting environments.

[0091] Furthermore, such as Figure 2 As shown, the refrigeration circuit 2 includes a variable frequency compressor 21, a condenser 22, an electronic expansion valve 23, and an evaporator 24, which are connected in sequence through refrigerant pipelines.

[0092] Evaporator 24 and condenser 22 are arranged sequentially in the air handling channel along the air flow direction so that the air entering the housing 1 is first cooled and dehumidified by evaporator 24, then reheated by condenser 22 and discharged from the air outlet.

[0093] In this embodiment, the refrigeration circuit 2 includes a variable frequency compressor 21, a condenser 22, an electronic expansion valve 23, and an evaporator 24. The variable frequency compressor 21, condenser 22, electronic expansion valve 23, and evaporator 24 are connected in sequence through refrigerant pipelines so that the refrigerant circulates within the refrigeration circuit 2.

[0094] The variable frequency compressor 21 drives the refrigerant to flow within the refrigeration circuit 2 and changes the dehumidification capacity of the refrigeration circuit 2 by adjusting its operating frequency. The condenser 22 releases heat from the refrigerant flowing through it and uses this released heat to reheat the cooled and dehumidified air. An electronic expansion valve 23 is located between the condenser 22 and the evaporator 24 and controls the amount of refrigerant entering the evaporator 24 by adjusting its opening. The evaporator 24 allows the refrigerant flowing through it to absorb heat from the air, thereby cooling and dehumidifying the air flowing through the air handling passage.

[0095] Evaporator 24 and condenser 22 are arranged sequentially in the air handling channel along the air flow direction. The air entering the housing 1 first flows through evaporator 24, where it is cooled and dehumidified. Then it flows through condenser 22, where it is reheated. The reheated air is then discharged from the air outlet.

[0096] By adjusting the operating frequency of the variable frequency compressor 21 and the opening degree of the electronic expansion valve 23, the dehumidification capacity of the refrigeration circuit 2 can be adjusted, so that the refrigeration circuit 2 can cool, dehumidify and reheat the air flowing through the air handling channel.

[0097] Furthermore, such as Figure 3 As shown, detection component 4 includes:

[0098] An air inlet temperature sensor 41 is installed at the air inlet to detect the air inlet temperature of the air entering the housing 1.

[0099] An air intake humidity sensor 42 is installed at the air intake and is used to detect the relative humidity of the air entering the housing 1.

[0100] An evaporation temperature sensor 43 is installed on the evaporator 24 to detect the actual evaporation temperature of the evaporator 24.

[0101] In this embodiment, the detection component 4 includes an inlet air temperature sensor 41, an inlet air humidity sensor 42, and an evaporation temperature sensor 43, which are electrically connected to the controller 5.

[0102] An air inlet temperature sensor 41 is located at the air inlet to detect the air temperature entering the housing 1 and sends the detected air temperature to the controller 5. An air inlet humidity sensor 42 is located at the air inlet to detect the relative humidity of the air entering the housing 1 and sends the detected relative humidity to the controller 5.

[0103] An evaporation temperature sensor 43 is installed on the evaporator 24 to detect the actual evaporation temperature of the evaporator 24 and send the detected actual evaporation temperature to the controller 5.

[0104] The controller 5 calculates the inlet air vapor pressure difference based on the inlet air temperature and relative humidity, and determines the operating status of the refrigeration circuit 2 based on the actual evaporation temperature, thereby providing a basis for determining the switching status of the lights off in the planting environment and adjusting the dehumidification capacity of the refrigeration circuit 2.

[0105] Furthermore, such as Figure 4 As shown, controller 5 includes:

[0106] The vapor pressure difference calculation module 51 is connected to the inlet air temperature sensor 41 and the inlet air humidity sensor 42 respectively, and is used to calculate the inlet air vapor pressure difference based on the inlet air temperature and the inlet air relative humidity.

[0107] The light-off switching detection module 52 is connected to the vapor pressure difference calculation module 51. It is used to determine the temperature drop rate based on the inlet air temperature, the vapor pressure difference drop rate based on the inlet air vapor pressure difference, and the light-off switching state of the planting environment based on the temperature drop rate and the vapor pressure difference drop rate.

[0108] The feedforward adjustment module 53 is connected to the light-off switching detection module 52 and is used to generate a feedforward adjustment amount when the light-off switching state is determined.

[0109] The cascaded PID control module 54 includes a main PID controller and a secondary PID controller. The main PID controller is connected to the vapor pressure difference calculation module 51 and is used to generate feedback adjustment quantity based on the target vapor pressure difference and the inlet vapor pressure difference. The secondary PID controller is connected to the evaporation temperature sensor 43 and is used to generate compressor frequency adjustment quantity based on the target evaporation temperature and the actual evaporation temperature.

[0110] The actuator coordination module 55 is connected to the feedforward adjustment module 53, the cascade PID control module 54, the variable frequency compressor 21, the electronic expansion valve 23, and the variable frequency fan 3, respectively. It is used to superimpose the feedforward adjustment amount and the feedback adjustment amount to obtain the comprehensive adjustment amount, determine the target evaporation temperature according to the comprehensive adjustment amount, adjust the operating frequency of the variable frequency compressor 21 according to the compressor frequency adjustment amount, and coordinate the opening degree of the electronic expansion valve 23 and the operating speed of the variable frequency fan 3 according to the comprehensive adjustment amount.

[0111] In this embodiment, the controller 5 includes a vapor pressure difference calculation module 51, a light-off switching detection module 52, a feedforward adjustment module 53, a cascade PID control module 54, and an actuator coordination module 55. The vapor pressure difference calculation module 51, the light-off switching detection module 52, the feedforward adjustment module 53, the cascade PID control module 54, and the actuator coordination module 55 cooperate to determine the light-off switching state of the planting environment and adjust the dehumidification capacity of the refrigeration circuit 2 and the operating speed of the variable frequency fan 3.

[0112] The vapor pressure difference calculation module 51 is connected to the inlet air temperature sensor 41 and the inlet air humidity sensor 42, respectively, to acquire the inlet air temperature detected by the inlet air temperature sensor 41 and the inlet air relative humidity detected by the inlet air humidity sensor 42, and to calculate the inlet air vapor pressure difference based on the inlet air temperature and inlet air relative humidity. The inlet air vapor pressure difference is used to characterize the vapor pressure difference of the air entering the housing 1.

[0113] The light-off switching detection module 52 is connected to the vapor pressure difference calculation module 51. It acquires the inlet air temperature and inlet vapor pressure difference, determines the temperature drop rate based on the decrease in inlet air temperature over time, and determines the vapor pressure difference drop rate based on the decrease in inlet vapor pressure difference over time. The light-off switching detection module 52 determines whether the temperature drop rate reaches a preset temperature rate threshold and whether the vapor pressure difference drop rate reaches a preset vapor pressure difference rate threshold. When both the temperature drop rate and vapor pressure difference drop rate reach the preset temperature rate threshold and the preset vapor pressure difference rate threshold, the light-off switching detection module 52 determines that the planting environment is in a light-off switching state.

[0114] The feedforward adjustment module 53 is connected to the light-off switching detection module 52 and is used to obtain the light-off switching state determined by the light-off switching detection module 52. When it is determined that the planting environment is in the light-off switching state, the feedforward adjustment module 53 generates a feedforward adjustment amount based on the temperature drop rate and the vapor pressure difference drop rate, and sends the feedforward adjustment amount to the actuator coordination module 55.

[0115] The cascaded PID control module 54 includes a main PID controller and a secondary PID controller. The main PID controller is connected to the vapor pressure difference calculation module 51 and is used to obtain the inlet vapor pressure difference, calculate the vapor pressure difference deviation based on the target vapor pressure difference and the inlet vapor pressure difference, and generate a feedback adjustment quantity based on the vapor pressure difference deviation. The main PID controller sends the feedback adjustment quantity to the actuator coordination module 55.

[0116] The actuator coordination module 55 is connected to both the feedforward regulation module 53 and the cascade PID control module 54. It acquires the feedforward and feedback regulation values, superimposes them to obtain a comprehensive regulation value, and determines the target evaporation temperature based on this comprehensive regulation value. The actuator coordination module 55 then sends the target evaporation temperature to the cascade PID control module 54.

[0117] The secondary PID controller is connected to the evaporation temperature sensor 43 to obtain the actual evaporation temperature detected by the sensor. It calculates the evaporation temperature deviation based on the target evaporation temperature and the actual evaporation temperature, and generates a compressor frequency adjustment based on this deviation. The secondary PID controller then sends the compressor frequency adjustment to the actuator coordination module 55.

[0118] The actuator coordination module 55 is connected to the variable frequency compressor 21, the electronic expansion valve 23 and the variable frequency fan 3 respectively. It is used to adjust the operating frequency of the variable frequency compressor 21 according to the compressor frequency adjustment amount, and coordinate the opening degree of the electronic expansion valve 23 and the operating speed of the variable frequency fan 3 according to the comprehensive adjustment amount, so as to adjust the dehumidification capacity of the refrigeration circuit 2.

[0119] In summary, the vapor pressure difference calculation module 51 calculates the inlet vapor pressure difference, the light-off switching detection module 52 determines the light-off switching state of the planting environment based on the temperature drop rate and the vapor pressure difference drop rate, the feedforward adjustment module 53 generates the feedforward adjustment amount, the main PID controller generates the feedback adjustment amount, the actuator coordination module 55 superimposes the feedforward adjustment amount and the feedback adjustment amount to obtain the comprehensive adjustment amount and determines the target evaporation temperature, the secondary PID controller generates the compressor frequency adjustment amount based on the target evaporation temperature and the actual evaporation temperature, and the actuator coordination module 55 adjusts the variable frequency compressor 21, the electronic expansion valve 23 and the variable frequency fan 3 based on the compressor frequency adjustment amount and the comprehensive adjustment amount.

[0120] like Figure 5 As shown, a dehumidification method for a planting environment that responds to light-off conditions is applied to a dehumidification device for a planting environment that responds to light-off conditions. The method includes:

[0121] S10: Obtain the inlet air temperature and relative humidity, and calculate the inlet air vapor pressure difference based on the inlet air temperature and relative humidity.

[0122] In this embodiment, the controller 5 obtains the inlet air temperature through the inlet air temperature sensor 41 and the inlet air relative humidity through the inlet air humidity sensor 42. The vapor pressure difference calculation module 51 calculates the inlet air vapor pressure difference based on the inlet air temperature and the inlet air relative humidity.

[0123] Specifically, the inlet steam pressure difference satisfies:

[0124] .

[0125] Among them, VPD in T represents the inlet steam pressure difference, in kilopascals (kPa). in Indicates the intake air temperature, in degrees Celsius; RH in The relative humidity of the incoming air is expressed as a percentage; exp represents an exponential function with the natural constant as the base; 0.6108, 17.27, and 237.3 are preset calculation coefficients.

[0126] The vapor pressure difference calculation module 51 substitutes the obtained inlet air temperature and inlet air relative humidity into the above formula to obtain the inlet air vapor pressure difference, and sends the inlet air vapor pressure difference to the light-off switching detection module 52 and the cascade PID control module 54.

[0127] S20: Calculate the rate of temperature drop based on the inlet air temperature, and calculate the rate of vapor pressure drop based on the inlet air vapor pressure difference.

[0128] In this embodiment, the light-off switching detection module 52 acquires the inlet air temperature and inlet air vapor pressure difference according to a preset sampling time interval, calculates the temperature drop rate based on the inlet air temperature at two adjacent sampling times, and calculates the vapor pressure difference drop rate based on the inlet air vapor pressure difference at two adjacent sampling times.

[0129] Specifically, the rate of temperature decrease satisfies:

[0130] .

[0131] The rate of decrease of vapor pressure difference satisfies:

[0132] .

[0133] in, This indicates the rate of temperature decrease at the current sampling moment; This indicates the rate of decrease of the vapor pressure differential at the current sampling moment; This indicates the inlet air temperature at the current sampling time; This indicates the intake air temperature at the previous sampling time; This represents the inlet vapor pressure difference at the current sampling moment; The value represents the inlet steam pressure difference at the previous sampling time; k represents the current sampling time; k−1 represents the previous sampling time; Δt represents the preset sampling time interval, which is the preset time interval between two adjacent sampling times, used to obtain the inlet air temperature and inlet steam pressure difference between two adjacent sampling times; max represents taking the maximum value of the value in parentheses.

[0134] When the inlet air temperature at the current sampling time is lower than the inlet air temperature at the previous sampling time, the light-off switching detection module 52 obtains the temperature drop rate based on the difference between the inlet air temperatures at the two sampling times and the preset sampling time interval; when the inlet air temperature at the current sampling time is not lower than the inlet air temperature at the previous sampling time, the temperature drop rate is zero.

[0135] When the inlet steam pressure difference at the current sampling time is lower than the inlet steam pressure difference at the previous sampling time, the light-off switching detection module 52 obtains the steam pressure difference decrease rate based on the difference between the inlet steam pressure differences at the two sampling times and the preset sampling time interval; when the inlet steam pressure difference at the current sampling time is not lower than the inlet steam pressure difference at the previous sampling time, the steam pressure difference decrease rate is zero.

[0136] S30: When the rate of temperature decrease reaches the preset temperature rate threshold and the rate of vapor pressure difference decrease reaches the preset vapor pressure difference rate threshold, the planting environment is determined to be in the light-off switching state.

[0137] In this embodiment, the light-off switching detection module 52 compares the temperature drop rate with a preset temperature rate threshold and the vapor pressure difference drop rate with a preset vapor pressure difference rate threshold.

[0138] Specifically, the conditions for determining the light-off switching state are met:

[0139] .

[0140] in, Indicates the rate of temperature decrease; Indicates the rate of decrease in vapor pressure differential; Indicates the preset temperature rate threshold; This indicates the preset vapor pressure differential rate threshold; the symbol "≥" indicates that it has been reached; the symbol "∧" indicates that both judgment conditions are met simultaneously.

[0141] When the rate of temperature decrease reaches a preset temperature rate threshold and the rate of vapor pressure difference decrease reaches a preset vapor pressure difference rate threshold, the light-off switching detection module 52 determines that the planting environment is in the light-off switching state.

[0142] S40: When the planting environment is in the light-off switching state, a feedforward adjustment amount is generated based on the rate of temperature decrease and the rate of vapor pressure difference decrease.

[0143] In this embodiment, when the light-off switching detection module 52 determines that the planting environment is in the light-off switching state, the feedforward adjustment module 53 generates a temperature feedforward adjustment component based on the temperature drop rate and the preset temperature feedforward gain coefficient, generates a vapor pressure difference feedforward adjustment component based on the vapor pressure difference drop rate and the preset vapor pressure difference feedforward gain coefficient, and superimposes the temperature feedforward adjustment component and the vapor pressure difference feedforward adjustment component to obtain the feedforward adjustment amount.

[0144] Specifically, the feedforward adjustment satisfies:

[0145] .

[0146] in, Indicates the feedforward adjustment amount; This represents the preset temperature feedforward gain coefficient; This represents the preset vapor pressure difference feedforward gain coefficient; Indicates the temperature feedforward adjustment component; This represents the vapor pressure differential feedforward adjustment component.

[0147] The feedforward adjustment module 53 superimposes the temperature feedforward adjustment component and the vapor pressure difference feedforward adjustment component to obtain the feedforward adjustment amount, and sends the feedforward adjustment amount to the actuator coordination module 55.

[0148] S50: Calculate the vapor pressure difference deviation based on the target vapor pressure difference and the inlet vapor pressure difference, generate a feedback regulation amount based on the vapor pressure difference deviation, and superimpose the feedback regulation amount with the feedforward regulation amount to obtain the comprehensive regulation amount.

[0149] In this embodiment, the main PID controller calculates the vapor pressure difference deviation based on the target vapor pressure difference and the inlet vapor pressure difference.

[0150] Specifically, the vapor pressure difference deviation satisfies:

[0151] .

[0152] The main PID controller generates a feedback regulation quantity based on the vapor pressure difference deviation, and the feedback regulation quantity satisfies:

[0153] .

[0154] The actuator coordination module 55 superimposes the feedback adjustment amount and the feedforward adjustment amount to obtain the comprehensive adjustment amount.

[0155] The overall adjustment amount meets the following requirements:

[0156] in, Indicates the vapor pressure difference deviation; Indicates the target vapor pressure difference; Indicates the inlet steam pressure difference; Indicates the feedback adjustment amount; This represents the proportional coefficient of the main PID controller; This represents the integral coefficient of the main PID controller. Indicates the feedback adjustment amount; Indicates the derivative coefficient of the main PID controller; i represents the cumulative sequence number of the vapor pressure difference deviation; This indicates the overall adjustment amount.

[0157] S60: Determine the target evaporation temperature based on the comprehensive adjustment amount, obtain the actual evaporation temperature, and adjust the dehumidification capacity of the refrigeration circuit 2 according to the target evaporation temperature and the actual evaporation temperature.

[0158] Specifically, the target evaporation temperature satisfies:

[0159] .

[0160] Evaporation temperature deviation satisfies:

[0161] .

[0162] The secondary PID controller generates the compressor frequency adjustment based on the evaporation temperature deviation, and the compressor frequency adjustment satisfies the following:

[0163] .

[0164] The operating frequency of the variable frequency compressor 21 meets the following requirements:

[0165] .

[0166] in, Indicates the target evaporation temperature; This indicates the target evaporation temperature at the previous sampling time; Indicates the actual evaporation temperature; Indicates the deviation in evaporation temperature; Indicates the compressor frequency adjustment amount; This represents the proportional coefficient of the secondary PID controller; This represents the integral coefficient of the secondary PID controller; Represents the derivative coefficients of the secondary PID controller; This indicates the operating frequency of the variable frequency compressor 21; This indicates the operating frequency of the variable frequency compressor 21 at the previous sampling time.

[0167] The secondary PID controller adjusts the operating frequency of the variable frequency compressor 21 according to the compressor frequency adjustment amount, so as to adjust the dehumidification capacity of the refrigeration circuit 2.

[0168] S70: After a preset feedforward duration is elapsed since the planting environment is determined to be in the light-off switching state, the feedforward adjustment amount is gradually reduced to zero.

[0169] In this embodiment, the preset feedforward duration refers to the preset time elapsed from the moment the planting environment is determined to be in the light-off switching state to maintain the feedforward adjustment amount. Timing begins when the planting environment is determined to be in the light-off switching state. When the timing duration has not reached the preset feedforward duration, the feedforward adjustment amount is maintained; when the timing duration reaches the preset feedforward duration, the feedforward adjustment amount is gradually reduced to zero according to a preset exponential decay law.

[0170] Specifically, the feedforward adjustment satisfies:

[0171] .

[0172] in, Indicates the current time; This indicates the moment when the planting environment is confirmed to be in a light-off switching state; Indicates the duration of the time; Indicates the preset feedforward duration; This represents the preset exponential decay coefficient, which is a preset coefficient used to determine the rate at which the feedforward adjustment gradually decreases according to a preset exponential decay law. The larger the preset exponential decay coefficient, the faster the feedforward adjustment decreases. This indicates the feedforward adjustment amount generated when the planting environment is determined to be in a state of switching off the lights.

[0173] When the timing duration does not reach the preset feedforward duration, the feedforward adjustment remains unchanged; when the timing duration reaches the preset feedforward duration, the feedforward adjustment gradually decreases to zero according to the preset exponential decay law as the timing duration increases.

[0174] In one embodiment, step S30, namely the step of determining that the planting environment is in a light-off switching state, includes:

[0175] S301: Determine whether the rate of temperature decrease reaches the preset temperature rate threshold, and determine whether the rate of vapor pressure difference decrease reaches the preset vapor pressure difference rate threshold.

[0176] In this embodiment, the light-off switching detection module 52 compares the temperature drop rate with a preset temperature rate threshold and the vapor pressure difference drop rate with a preset vapor pressure difference rate threshold.

[0177] Specifically, when the rate of temperature decrease reaches a preset temperature rate threshold, it is determined that the rate of temperature decrease meets the corresponding judgment condition; when the rate of vapor pressure difference decrease reaches a preset vapor pressure difference rate threshold, it is determined that the rate of vapor pressure difference decrease meets the corresponding judgment condition.

[0178] S302: If the rate of temperature decrease reaches the preset temperature rate threshold and the rate of vapor pressure difference decrease reaches the preset vapor pressure difference rate threshold and continues for a preset confirmation time, then the planting environment is determined to be in the light-off switching state.

[0179] In this embodiment, the preset confirmation duration refers to the preset duration required to maintain the state where the temperature drop rate reaches a preset temperature rate threshold and the vapor pressure difference drop rate reaches a preset vapor pressure difference rate threshold. When the temperature drop rate reaches the preset temperature rate threshold and the vapor pressure difference drop rate reaches the preset vapor pressure difference rate threshold, the light-off switching detection module 52 starts timing.

[0180] Specifically, during the timing process, the light-off switching detection module 52 continuously determines whether the temperature drop rate reaches a preset temperature rate threshold and whether the vapor pressure difference drop rate reaches a preset vapor pressure difference rate threshold. When the state of both the temperature drop rate and the vapor pressure difference drop rate reaching the preset vapor pressure difference rate threshold reaches a preset confirmation time, it is determined that the planting environment is in the light-off switching state.

[0181] Furthermore, if the rate of temperature decrease does not reach the preset temperature rate threshold, or the rate of vapor pressure decrease does not reach the preset vapor pressure difference rate threshold, or if the state where both reach the corresponding thresholds does not reach the preset confirmation time, it is determined that the planting environment is not in the light-off switching state.

[0182] In one embodiment, step S40, namely the step of generating the feedforward adjustment amount based on the temperature decrease rate and the vapor pressure difference decrease rate, includes:

[0183] S401: Generates a temperature feedforward adjustment component based on the temperature drop rate and a preset temperature feedforward gain coefficient.

[0184] In this embodiment, the feedforward adjustment module 53 generates a temperature feedforward adjustment component based on the temperature drop rate and a preset temperature feedforward gain coefficient.

[0185] Specifically, the temperature feedforward regulation component satisfies:

[0186] .

[0187] in, This represents the temperature feedforward adjustment component.

[0188] S402: Generates a vapor pressure difference feedforward adjustment component based on the vapor pressure difference decrease rate and the preset vapor pressure difference feedforward gain coefficient.

[0189] In this embodiment, the feedforward adjustment module 53 generates a vapor pressure difference feedforward adjustment component based on the vapor pressure difference decrease rate and a preset vapor pressure difference feedforward gain coefficient.

[0190] Specifically, the vapor pressure difference feedforward regulation component satisfies:

[0191] .

[0192] in, This represents the vapor pressure differential feedforward adjustment component.

[0193] S403: The temperature feedforward regulation component and the vapor pressure difference feedforward regulation component are superimposed to obtain the feedforward regulation amount.

[0194] In this embodiment, the feedforward adjustment module 53 acquires the temperature feedforward adjustment component generated according to the temperature decrease rate, and acquires the vapor pressure difference feedforward adjustment component generated according to the vapor pressure difference decrease rate.

[0195] Specifically, the feedforward adjustment module 53 acquires the temperature feedforward adjustment component and the vapor pressure difference feedforward adjustment component at the same sampling moment, adds the temperature feedforward adjustment component and the vapor pressure difference feedforward adjustment component, and determines the sum as the feedforward adjustment amount at the current sampling moment. The feedforward adjustment module 53 sends the feedforward adjustment amount to the actuator coordination module 55, so that the actuator coordination module 55 can superimpose the feedforward adjustment amount and the feedback adjustment amount to obtain the comprehensive adjustment amount.

[0196] In one embodiment, step S60, which involves determining the target evaporation temperature based on the comprehensive adjustment amount, obtaining the actual evaporation temperature, and adjusting the dehumidification capacity of the refrigeration circuit 2 based on the target evaporation temperature and the actual evaporation temperature, includes:

[0197] S601: Input the vapor pressure difference deviation into the main PID controller, and generate a feedback regulation quantity through the main PID controller.

[0198] In this embodiment, the main PID controller acquires the vapor pressure difference deviation and generates a feedback adjustment amount based on the vapor pressure difference deviation.

[0199] Specifically, the main PID controller acquires the vapor pressure difference deviation at the current sampling time, the vapor pressure difference deviation before the current sampling time, and the vapor pressure difference deviation between two adjacent sampling times, generates the feedback adjustment amount at the current sampling time, and sends the feedback adjustment amount to the actuator coordination module 55.

[0200] S602: The feedback regulation and the feedforward regulation are superimposed to obtain the comprehensive regulation.

[0201] In this embodiment, the actuator coordination module 55 obtains the feedback adjustment amount generated by the main PID controller and the feedforward adjustment amount generated by the feedforward adjustment module 53.

[0202] Specifically, the actuator coordination module 55 acquires the feedback adjustment amount and the feedforward adjustment amount at the same sampling time, adds the feedback adjustment amount and the feedforward adjustment amount, and determines the sum as the comprehensive adjustment amount at the current sampling time, so as to determine the target evaporation temperature based on the comprehensive adjustment amount.

[0203] S603: Determine the target evaporation temperature based on the comprehensive adjustment amount.

[0204] In this embodiment, the actuator coordination module 55 obtains the comprehensive adjustment amount at the current sampling time.

[0205] Specifically, the actuator coordination module 55 acquires the target evaporation temperature at the previous sampling time, adjusts the target evaporation temperature at the previous sampling time based on the comprehensive adjustment amount at the current sampling time, and determines the adjusted target evaporation temperature as the target evaporation temperature at the current sampling time. The actuator coordination module 55 sends the target evaporation temperature to the secondary PID controller.

[0206] S604: Calculate the evaporation temperature deviation based on the actual evaporation temperature and the target evaporation temperature.

[0207] In this embodiment, the controller 5 acquires the actual evaporation temperature detected by the evaporation temperature sensor 43 and the target evaporation temperature determined by the actuator coordination module 55.

[0208] Specifically, controller 5 acquires the actual evaporation temperature and the target evaporation temperature at the same sampling time, subtracts the target evaporation temperature from the actual evaporation temperature to obtain the evaporation temperature deviation at the current sampling time, and inputs the evaporation temperature deviation into the secondary PID controller.

[0209] S605: Input the evaporation temperature deviation into the secondary PID controller, which then generates the compressor frequency adjustment.

[0210] In this embodiment, the secondary PID controller acquires the evaporation temperature deviation and generates the compressor frequency adjustment amount based on the evaporation temperature deviation.

[0211] Specifically, the sub-PID controller acquires the evaporation temperature deviation at the current sampling time, the evaporation temperature deviation before the current sampling time, and the evaporation temperature deviation between two adjacent sampling times, generates the compressor frequency adjustment amount at the current sampling time, and sends the compressor frequency adjustment amount to the actuator coordination module 55.

[0212] S606: Adjust the operating frequency of the variable frequency compressor 21 according to the compressor frequency adjustment amount.

[0213] In this embodiment, the actuator coordination module 55 obtains the compressor frequency adjustment amount generated by the sub-PID controller.

[0214] Specifically, the actuator coordination module 55 obtains the operating frequency of the variable frequency compressor 21 at the previous sampling time, adjusts the operating frequency at the previous sampling time according to the compressor frequency adjustment amount at the current sampling time, and determines the adjusted operating frequency as the operating frequency of the variable frequency compressor 21 at the current sampling time, so as to adjust the dehumidification capacity of the refrigeration circuit 2.

[0215] In one embodiment, step S606, namely the step of adjusting the operating frequency of the variable frequency compressor 21 according to the compressor frequency adjustment amount, further includes:

[0216] S6061: Determine whether the target evaporation temperature has reached the boundary value of the preset evaporation temperature range, and determine whether the operating frequency of the variable frequency compressor 21 has reached the boundary value of the preset operating frequency range.

[0217] In this embodiment, the controller 5 obtains the target evaporation temperature and the operating frequency of the variable frequency compressor 21 at the current sampling time.

[0218] Specifically, the controller 5 compares the target evaporation temperature with the boundary value of the preset evaporation temperature range to determine whether the target evaporation temperature has reached the boundary value of the preset evaporation temperature range; at the same time, it compares the operating frequency of the variable frequency compressor 21 with the boundary value of the preset operating frequency range to determine whether the operating frequency of the variable frequency compressor 21 has reached the boundary value of the preset operating frequency range.

[0219] S6062: When the target evaporation temperature reaches the boundary value of the preset evaporation temperature range, and the adjustment direction of the main PID controller is to make the target evaporation temperature exceed the preset evaporation temperature range, the integral term accumulation of the main PID controller is stopped.

[0220] In this embodiment, when the target evaporation temperature reaches the boundary value of the preset evaporation temperature range, the controller 5 further determines the adjustment direction of the main PID controller.

[0221] Specifically, when the adjustment direction of the main PID controller is to change the target evaporation temperature from the boundary value of the preset evaporation temperature range to outside the preset evaporation temperature range, the accumulation of the integral term of the main PID controller is stopped, and the integral term when the main PID controller stops accumulating integral terms is maintained.

[0222] S6063: When the operating frequency of the variable frequency compressor 21 reaches the boundary value of the preset operating frequency range, and the adjustment direction of the auxiliary PID controller is to make the operating frequency of the variable frequency compressor 21 exceed the preset operating frequency range, the integral term accumulation of the auxiliary PID controller is stopped.

[0223] In this embodiment, when the operating frequency of the variable frequency compressor 21 reaches the boundary value of the preset operating frequency range, the controller 5 further determines the adjustment direction of the sub-PID controller.

[0224] Specifically, when the adjustment direction of the secondary PID controller is to change the operating frequency of the variable frequency compressor 21 from the boundary value of the preset operating frequency range to outside the preset operating frequency range, the integral term accumulation of the secondary PID controller is stopped, and the integral term when the secondary PID controller stops accumulating integral terms is maintained.

[0225] S6064: When the target evaporation temperature recovers to the preset evaporation temperature range, the integral term accumulation of the main PID controller is restored.

[0226] In this embodiment, during the period when the main PID controller stops accumulating integral terms, the controller 5 continuously acquires the target evaporation temperature and determines whether the target evaporation temperature has recovered to the preset evaporation temperature range.

[0227] Specifically, controller 5 acquires the target evaporation temperature at the current sampling moment and compares it with the preset evaporation temperature range. When the target evaporation temperature has not recovered to the preset evaporation temperature range, the integral term accumulation of the main PID controller continues to stop; when the target evaporation temperature recovers to the preset evaporation temperature range, the main PID controller continues to accumulate integral terms based on the integral term maintained when the integral term accumulation was stopped, according to the vapor pressure difference deviation at the current sampling moment.

[0228] S6065: When the operating frequency of the variable frequency compressor 21 returns to the preset operating frequency range, the integral term accumulation of the sub-PID controller is restored.

[0229] In this embodiment, during the period when the sub-PID controller stops accumulating integral terms, the controller 5 continuously acquires the operating frequency of the variable frequency compressor 21 and determines whether the operating frequency of the variable frequency compressor 21 has recovered to the preset operating frequency range.

[0230] Specifically, controller 5 acquires the operating frequency of variable frequency compressor 21 at the current sampling moment and compares the operating frequency at the current sampling moment with the preset operating frequency range. When the operating frequency of variable frequency compressor 21 has not recovered to the preset operating frequency range, the integral term accumulation of the sub-PID controller continues to stop; when the operating frequency of variable frequency compressor 21 recovers to the preset operating frequency range, the sub-PID controller continues to accumulate integral terms based on the integral term maintained when the integral term accumulation stopped, according to the evaporation temperature deviation at the current sampling moment.

[0231] In one embodiment, step S70, which involves gradually reducing the feedforward adjustment amount to zero, includes:

[0232] S701: Start timing when the planting environment is in the light-off switching state.

[0233] In this embodiment, the light-off switching detection module 52 determines that the planting environment is in the light-off switching state and sends the light-off switching state to the feedforward adjustment module 53.

[0234] Specifically, when the feedforward adjustment module 53 receives the light-off switching state, it sets the timing duration to zero and starts timing, so that the timing duration gradually increases from the moment when the planting environment is determined to be in the light-off switching state, and adjusts the feedforward adjustment amount according to the comparison result of the timing duration and the preset feedforward action duration.

[0235] S702: When the timing duration has not reached the preset feedforward duration, maintain the feedforward adjustment amount.

[0236] In this embodiment, the feedforward adjustment module 53 continuously acquires the timing duration during the timing process and compares the timing duration with the preset feedforward action duration.

[0237] Specifically, when the timing duration has not reached the preset feedforward duration, the feedforward adjustment module 53 maintains the feedforward adjustment amount generated when the planting environment is determined to be in the light-off switching state, and sends the maintained feedforward adjustment amount to the actuator coordination module 55, so that the actuator coordination module 55 can superimpose the feedforward adjustment amount and the feedback adjustment amount to obtain the comprehensive adjustment amount.

[0238] S703: When the timing duration reaches the preset feedforward duration, the feedforward adjustment amount is gradually reduced to zero according to the preset exponential decay law.

[0239] In this embodiment, the feedforward adjustment module 53 continuously compares the timing duration with the preset feedforward action duration. When the timing duration reaches the preset feedforward action duration, the feedforward adjustment module 53 stops maintaining the feedforward adjustment amount and begins to gradually reduce the feedforward adjustment amount according to a preset exponential decay law.

[0240] Specifically, the feedforward adjustment module 53 uses the feedforward adjustment amount when the timing duration reaches the preset feedforward action duration as a basis, and determines the corresponding feedforward adjustment amount at each subsequent sampling time according to a preset exponential decay law, and sends the corresponding feedforward adjustment amount to the actuator coordination module 55 until the feedforward adjustment amount gradually decreases to zero. When the feedforward adjustment amount decreases to zero, the feedforward adjustment module 53 maintains the feedforward adjustment amount at zero.

[0241] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0242] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0243] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A dehumidification device for a planting environment that responds to light-off conditions, characterized in that, The aforementioned light-off response control dehumidification device for planting environments includes: The housing (1) is provided with an air inlet and an air outlet, and an air handling channel is formed between the air inlet and the air outlet; A refrigeration circuit (2) is disposed inside the housing (1) and is used to cool, dehumidify and reheat the air flowing through the air handling channel; A variable frequency fan (3) is installed in the air handling channel to drive the air in the planting environment to enter the housing (1) through the air inlet, flow through the refrigeration circuit (2) and be discharged through the air outlet. A detection component (4), disposed on the housing (1) and the refrigeration circuit (2), is used to detect the air state parameters entering the housing (1) and the operating state parameters of the refrigeration circuit (2); and The controller (5) is electrically connected to the refrigeration circuit (2), the variable frequency fan (3) and the detection component (4) respectively. It is used to determine the light-off switching state of the planting environment based on the air state parameters detected by the detection component (4), and to adjust the dehumidification capacity of the refrigeration circuit (2) and the operating speed of the variable frequency fan (3) when the light-off switching state is determined.

2. The dehumidification device for light-off response control in a planting environment according to claim 1, characterized in that, The refrigeration circuit (2) includes a variable frequency compressor (21), a condenser (22), an electronic expansion valve (23), and an evaporator (24), which are connected in sequence through refrigerant pipelines; The evaporator (24) and the condenser (22) are arranged sequentially in the air handling channel along the air flow direction so that the air entering the housing (1) is first cooled and dehumidified by the evaporator (24), then reheated by the condenser (22) and discharged from the air outlet.

3. The dehumidification device for light-off response control in a planting environment according to claim 2, characterized in that, The detection component (4) includes: An air inlet temperature sensor (41) is installed at the air inlet to detect the air inlet temperature of the air entering the housing (1); An air inlet humidity sensor (42) is installed at the air inlet to detect the relative humidity of the air entering the housing (1); An evaporation temperature sensor (43) is installed on the evaporator (24) to detect the actual evaporation temperature of the evaporator (24).

4. The dehumidification device for light-off response control in a planting environment according to claim 3, characterized in that, The controller (5) includes: The vapor pressure difference calculation module (51) is connected to the inlet air temperature sensor (41) and the inlet air humidity sensor (42) respectively, and is used to calculate the inlet air vapor pressure difference based on the inlet air temperature and the inlet air relative humidity; The light-off switching detection module (52) is connected to the vapor pressure difference calculation module (51) and is used to determine the temperature drop rate based on the air inlet temperature, determine the vapor pressure difference drop rate based on the air inlet vapor pressure difference, and determine the light-off switching state of the planting environment based on the temperature drop rate and the vapor pressure difference drop rate. The feedforward adjustment module (53) is connected to the light-off switching detection module (52) and is used to generate a feedforward adjustment amount when the light-off switching state is determined. The cascaded PID control module (54) includes a main PID controller and a secondary PID controller. The main PID controller is connected to the vapor pressure difference calculation module (51) and is used to generate a feedback adjustment amount based on the target vapor pressure difference and the inlet vapor pressure difference. The secondary PID controller is connected to the evaporation temperature sensor (43) and is used to generate a compressor frequency adjustment amount based on the target evaporation temperature and the actual evaporation temperature. The actuator coordination module (55) is connected to the feedforward adjustment module (53), the cascade PID control module (54), the variable frequency compressor (21), the electronic expansion valve (23), and the variable frequency fan (3), respectively. It is used to superimpose the feedforward adjustment amount and the feedback adjustment amount to obtain a comprehensive adjustment amount, determine the target evaporation temperature according to the comprehensive adjustment amount, adjust the operating frequency of the variable frequency compressor (21) according to the compressor frequency adjustment amount, and coordinate the opening degree of the electronic expansion valve (23) and the operating speed of the variable frequency fan (3) according to the comprehensive adjustment amount.

5. A method for dehumidifying a planting environment in response to light-off conditions, applied to the planting environment dehumidification device as described in any one of claims 1-4, characterized in that, The dehumidification method for the planting environment in response to lights-out includes: Obtain the inlet air temperature and inlet air relative humidity, and calculate the inlet air vapor pressure difference based on the inlet air temperature and inlet air relative humidity; The rate of temperature decrease is calculated based on the inlet air temperature, and the rate of vapor pressure decrease is calculated based on the inlet air vapor pressure difference. When the temperature drop rate reaches a preset temperature rate threshold and the vapor pressure difference drop rate reaches a preset vapor pressure difference rate threshold, it is determined that the planting environment is in a light-off switching state. When the planting environment is in a light-off switching state, a feedforward adjustment amount is generated based on the temperature drop rate and the vapor pressure difference drop rate. The vapor pressure difference deviation is calculated based on the target vapor pressure difference and the inlet vapor pressure difference. A feedback adjustment amount is generated based on the vapor pressure difference deviation. The feedback adjustment amount is then superimposed with the feedforward adjustment amount to obtain the comprehensive adjustment amount. The target evaporation temperature is determined based on the comprehensive adjustment amount, the actual evaporation temperature is obtained, and the dehumidification capacity of the refrigeration circuit (2) is adjusted based on the target evaporation temperature and the actual evaporation temperature. After a preset feedforward duration has elapsed since the planting environment is determined to be in the light-off switching state, the feedforward adjustment amount is gradually reduced to zero.

6. The method for controlling dehumidification in a planting environment in response to light-off conditions according to claim 5, characterized in that, The step of determining that the planting environment is in a light-off switching state includes: Determine whether the rate of temperature decrease reaches a preset temperature rate threshold, and determine whether the rate of vapor pressure difference decrease reaches a preset vapor pressure difference rate threshold; If the rate of temperature decrease reaches the preset temperature rate threshold and the rate of vapor pressure decrease reaches the preset vapor pressure difference rate threshold, and this continues for a preset confirmation time, then it is determined that the planting environment is in a light-off switching state.

7. The method for controlling dehumidification in a planting environment in response to light-off conditions according to claim 5, characterized in that, The step of generating the feedforward adjustment amount based on the temperature decrease rate and the vapor pressure difference decrease rate includes: A temperature feedforward adjustment component is generated based on the temperature drop rate and the preset temperature feedforward gain coefficient. A vapor pressure difference feedforward adjustment component is generated based on the vapor pressure difference decrease rate and the preset vapor pressure difference feedforward gain coefficient; The feedforward adjustment amount is obtained by superimposing the temperature feedforward adjustment component and the vapor pressure difference feedforward adjustment component.

8. The method for controlling dehumidification in a planting environment in response to light-off conditions according to claim 5, characterized in that, The steps of determining the target evaporation temperature based on the comprehensive adjustment amount, obtaining the actual evaporation temperature, and adjusting the dehumidification capacity of the refrigeration circuit (2) based on the target evaporation temperature and the actual evaporation temperature include: The vapor pressure difference deviation is input into the main PID controller, which then generates the feedback adjustment quantity. The combined adjustment amount is obtained by superimposing the feedback adjustment amount and the feedforward adjustment amount; The target evaporation temperature is determined based on the comprehensive adjustment amount; Calculate the evaporation temperature deviation based on the actual evaporation temperature and the target evaporation temperature; The evaporation temperature deviation is input into the secondary PID controller, which then generates the compressor frequency adjustment. The operating frequency of the variable frequency compressor (21) is adjusted according to the compressor frequency adjustment amount.

9. The method for controlling dehumidification in a planting environment in response to light-off conditions according to claim 8, characterized in that, The step of adjusting the operating frequency of the variable frequency compressor (21) according to the compressor frequency adjustment amount further includes: Determine whether the target evaporation temperature has reached the boundary value of the preset evaporation temperature range, and determine whether the operating frequency of the variable frequency compressor (21) has reached the boundary value of the preset operating frequency range; When the target evaporation temperature reaches the boundary value of the preset evaporation temperature range, and the adjustment direction of the main PID controller is to make the target evaporation temperature exceed the preset evaporation temperature range, the accumulation of the integral term of the main PID controller is stopped. When the operating frequency of the variable frequency compressor (21) reaches the boundary value of the preset operating frequency range, and the adjustment direction of the sub-PID controller is to make the operating frequency of the variable frequency compressor (21) exceed the preset operating frequency range, the integral term accumulation of the sub-PID controller is stopped. When the target evaporation temperature recovers to the preset evaporation temperature range, the integral term accumulation of the main PID controller is restored; When the operating frequency of the variable frequency compressor (21) returns to the preset operating frequency range, the integral term accumulation of the sub-PID controller is restored.

10. The method for controlling dehumidification in a planting environment in response to light-off conditions according to claim 5, characterized in that, The step of gradually reducing the feedforward adjustment amount to zero includes: The timing begins when the planting environment is confirmed to be in a lights-off switching state. When the timing duration does not reach the preset feedforward duration, the feedforward adjustment amount is maintained; When the timing duration reaches the preset feedforward duration, the feedforward adjustment amount is gradually reduced to zero according to a preset exponential decay law.

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