A temperature and humidity control system specifically designed for machine-transplanted rice seedling raising in industrial settings

Abstract

This invention discloses a temperature and humidity control system specifically for factory-scale rice seedling raising, relating to the field of factory-scale rice seedling raising technology. By setting suitable temperature and humidity thresholds for rice seedling growth at each stage of cultivation, a first judgment function is constructed to determine whether temperature adjustment is needed at the current moment, and a second judgment function is constructed to determine whether humidity adjustment is needed at the current moment. The control mode is determined based on the values ​​of the judgment functions, parameter adjustment step sizes are set for different control modes, constraint functions are constructed for different control modes, and the ambient temperature T at the current moment t is collected in real time. t and ambient humidity H t The control mode at the current moment is determined by the result of the judgment function. The constraint function value of the control mode at the current moment is 0 as the constraint condition. The parameter to be adjusted at the current moment is adjusted to the set threshold range by the set parameter adjustment step size.

Description

Technical Field

[0001] This invention relates to the field of industrialized rice seedling raising technology, and in particular to a temperature and humidity control system specifically designed for industrialized rice seedling raising by machine transplanting. Background Technology

[0002] With the adjustment of agricultural planting structure and the transfer of rural labor, farmers' demands for mechanized rice planting are becoming increasingly urgent. Factory-style mechanized rice transplanting technology has advantages such as low seedling cost, high quality, low labor intensity, and cost savings, making it a key link in achieving full mechanization of rice production. Promoting factory-style mechanized rice transplanting technology can facilitate the use of improved rice varieties, large-scale seedling cultivation, and commercialized seedling supply. It is conducive to the combined implementation of improved varieties and cultivation methods, effectively solving problems such as poor management, competition for seedbeds, and labor shortages associated with traditional scattered seedling cultivation by farmers, and thus playing a positive role in improving the scientific level of grain production.

[0003] During the factory-style rice seedling raising process, strict temperature control is necessary to ensure seedling quality. Generally, from sowing to emergence, the focus is on maintaining warmth. The sown seedling trays are moved into a temperature-controlled greenhouse, where the temperature is maintained at 30-32℃ for approximately 48 hours until the seedlings show green color. If the greenhouse temperature exceeds 35℃ on a hot, sunny day, timely cooling is required to prevent seedling burn. From emergence to the one-leaf-one-heart stage, hardening off begins, with the greenhouse temperature controlled at 25-28℃ to promote normal root growth. When the greenhouse temperature exceeds 28℃, the cooling system is activated. From the one-leaf-one-heart to two-leaf-one-heart stage, the seedling trays are moved to a field-insect-net hardening-off greenhouse, where the temperature is controlled at 20-25℃. If the temperature exceeds 25℃, timely cooling is required. From the two-leaf-one-heart stage until transplanting, the greenhouse temperature is controlled at around 20℃, gradually transitioning to uncovering the film during the day and covering it at night. 3-5 days before transplanting, the film is completely uncovered for hardening off. If low temperatures occur, timely covering with film for warmth is necessary. In addition, the moisture content inside the greenhouse needs to be strictly controlled. The soil should be kept moist around the two-leaf stage of the seedlings, and the moisture content of the soil in the seedling tray should be controlled within the range of 35% to 40%.

[0004] Currently, temperature control methods in temperature-controlled greenhouses used for factory-scale rice seedling cultivation mainly include ventilation temperature control and spray temperature control. These typically employ threshold methods for temperature and humidity control, resulting in a low level of intelligence in the control process. Furthermore, different temperature control methods have varying degrees of impact on temperature control effectiveness. Additionally, spray temperature control can lead to significant humidity fluctuations within the greenhouse, affecting the moisture content of the soil in the seedling trays. Therefore, selecting appropriate temperature control methods and parameters at suitable times to maintain the temperature and humidity within the greenhouse consistently within the optimal growth range for seedlings, achieving refined and intelligent control, is a pressing technical challenge. To address this, we propose a temperature and humidity control system specifically designed for factory-scale machine-transplanted rice seedling cultivation. Summary of the Invention

[0005] The main objective of this invention is to provide a temperature and humidity control system specifically designed for factory-scale rice seedling raising by machine transplanting, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A temperature and humidity control system specifically designed for factory-scale rice seedling raising by machine transplanters, the control process of which includes the following steps:

[0008] Step 1: Set the appropriate temperature thresholds for rice seedling growth at each stage of cultivation. and growth humidity threshold These represent the minimum and maximum suitable growth temperatures for the i-th cultivation stage, respectively. These represent the minimum and maximum suitable growth humidity for the i-th cultivation stage, respectively.

[0009] Step 2: Construct a first judgment function f1(T) using the growth temperature threshold to determine whether temperature adjustment is needed at the current moment. t A second judgment function f2(H) is constructed using the growth humidity threshold to determine whether humidity adjustment is needed at the current moment. t The control mode is determined based on the value of the judgment function. The control mode includes a first control mode that only requires temperature adjustment, a second control mode that only requires humidity adjustment, and a third control mode that requires both temperature and humidity adjustment.

[0010] Step 3: Set the parameter adjustment step size for each of the different control modes. in, This is the temperature adjustment step size in the first control mode; This refers to the humidity adjustment step size in the second control mode. These are the temperature adjustment step size and humidity adjustment step size under the third control mode, respectively.

[0011] Step 4: Construct constraint functions under different control modes, including the first constraint function f1(ΔH) under the first control mode. t ), the second constraint function f2(ΔT) under the second control mode t The third constraint function f3(ΔT) in the third control mode t ,ΔH t ), where f1(ΔH) t f2(ΔT) t f3(ΔT) t ,ΔH t The function takes values ​​of 0 or 1.

[0012] Step 5: Real-time acquisition of the ambient temperature T at the current time t. t and ambient humidity H t The control mode at the current moment is determined by the value of the judgment function. The constraint function value of the control mode at the current moment is 0, which is used as the constraint condition. The parameters that need to be adjusted at the current moment are adjusted using the set parameter adjustment step size. and

[0013] The expression for the first judgment function is:

[0014]

[0015] The expression for the second judgment function is:

[0016]

[0017] Where, when f1(T) t When f2(H) ≠ 0, determine whether temperature adjustment is needed at the current moment; when f2(H) ≠ 0, determine whether temperature adjustment is needed at the current moment. t When ) ≠ 0, determine whether humidity adjustment is needed at the current moment.

[0018] The principle for determining the control mode is as follows:

[0019] When f1(T) t )≠0, and f2(H t When ) = 0, the control mode is the first control mode, which only requires temperature adjustment;

[0020] When f1(T) t ) = 0, and f2(H t When )≠0, the control mode is the second control mode that only requires humidity adjustment;

[0021] When f1(T) t )≠0, and f2(H t When )≠0, the control mode is the third control mode, which requires simultaneous temperature and humidity adjustment.

[0022] The expression for the first constraint function is:

[0023]

[0024] The expression for the second constraint function is:

[0025]

[0026] The expression for the third constraint function is:

[0027]

[0028] In the formula, H t-1 Let be the ambient humidity at time t-1; K1 is the first constraint coefficient, and K1≥0; T t-1 K is the ambient temperature at time t-1; K2 is the second constraint coefficient, and K2≥0; K3 is the third constraint coefficient, and K3≥0.

[0029] The parameter adjustment step size is based on the ambient temperature T at the current time t. t and ambient humidity H t With growth temperature threshold and growth humidity threshold The distance is determined based on the following principles:

[0030] when hour,

[0031] when hour,

[0032] when hour,

[0033] when hour,

[0034] The system includes a growth threshold setting module, a control mode determination module, an adjustment step size setting module, a constraint condition construction module, a real-time data acquisition module, and an environmental parameter adjustment module.

[0035] The growth threshold setting module is used to set the appropriate growth temperature threshold for rice seedlings at each cultivation stage. and growth humidity threshold

[0036] The control mode determination module is used to construct a first judgment function f1(T) based on the growth temperature threshold to determine whether temperature adjustment is needed at the current moment. t A second judgment function f2(H) is constructed using the growth humidity threshold to determine whether humidity adjustment is needed at the current moment. t The control mode is determined based on the value of the judgment function.

[0037] The adjustment step size setting module is used to set the parameter adjustment step size under different control modes;

[0038] The constraint construction module is used to construct constraint functions under different control modes;

[0039] The real-time data acquisition module is used to collect the ambient temperature T at the current time t in real time. t and ambient humidity H t ;

[0040] The environmental parameter adjustment module is used to determine the control mode at the current moment by using the value of the judgment function, taking the constraint function value of the control mode at the current moment as 0 as the constraint condition, and adjusting the parameters that need to be adjusted at the current moment to within the set threshold range with the set parameter adjustment step size.

[0041] The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor.

[0042] The present invention has the following beneficial effects:

[0043] Compared with existing technologies, this method sets suitable temperature and humidity thresholds for rice seedlings at each cultivation stage. A first judgment function is constructed using the temperature threshold to determine whether temperature adjustment is needed at the current moment, and a second judgment function is constructed using the humidity threshold to determine whether humidity adjustment is needed at the current moment. Based on the values ​​of these judgment functions, a control mode is determined. This control mode includes a first control mode requiring only temperature adjustment, a second control mode requiring only humidity adjustment, and a third control mode requiring simultaneous temperature and humidity adjustment. The parameter adjustment step size is set for each of these different control modes. The constraint functions are constructed under different control modes, including the first constraint function f1(ΔH) under the first control mode. t ), the second constraint function f2(ΔT) under the second control mode t The third constraint function f3(ΔT) in the third control mode t ,ΔH t The ambient temperature T at the current time t is collected in real time. t and ambient humidity H t The control mode at the current moment is determined by the value of the judgment function. The constraint function value of the control mode at the current moment is 0 as the constraint condition. The parameter adjustment step size is set to adjust the parameter that needs to be adjusted at the current moment to the set threshold range. It can select a suitable temperature and humidity control mode and use the constraint function to limit the adjustment parameters of the control process, so that the temperature and humidity in the temperature-controlled greenhouse are always kept within the most suitable growth range for the seedlings. This achieves refined and intelligent control of the rice seedling cultivation environment in the process of factory seedling cultivation. Attached Figure Description

[0044] Figure 1 This is a control flowchart of a temperature and humidity control system specifically designed for factory-scale rice seedling raising using machine transplanting, according to the present invention.

[0045] Figure 2This is a structural block diagram of a temperature and humidity control system specifically designed for factory-scale rice seedling raising using machine transplanting, according to the present invention.

[0046] Figure 3 This is a logic block diagram of the control process of the present invention. Detailed Implementation

[0047] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. In order to better illustrate the specific embodiments of the present invention, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the actual product size.

[0048] The specific implementation process of the technical solution of this invention includes the following steps:

[0049] Step 1: Set the appropriate temperature thresholds for rice seedling growth at each stage of cultivation. and growth humidity threshold These represent the minimum and maximum suitable growth temperatures for the i-th cultivation stage, respectively. These represent the minimum and maximum suitable growth humidity for the i-th cultivation stage, respectively.

[0050] Generally, from rice sowing to emergence, the focus is on heat preservation, with the optimal temperature in the temperature-controlled greenhouse being 30-32℃. From emergence to the one-leaf-one-heart stage, hardening off begins, with the greenhouse temperature controlled at 25-28℃. If the temperature exceeds 28℃, the cooling system should be activated. From the one-leaf-one-heart to two-leaf-one-heart stage, the seedling trays are moved into the hardening-off greenhouse, with the temperature controlled at 20-25℃. If the temperature exceeds 25℃, cooling should be implemented promptly. From the two-leaf-one-heart stage until transplanting, the greenhouse temperature should be controlled at around 20℃. 3-5 days before transplanting, the film should be completely removed for hardening off. If low temperatures occur, the film should be covered again for heat preservation, ideally maintaining a temperature of around 25℃. Regarding soil moisture, the soil should be kept moist around the two-leaf stage, with the soil moisture content in the seedling trays ideally controlled within the range of 35%-40%. Different growth temperature and humidity thresholds can be set based on the optimal temperature and humidity levels mentioned above for different stages of growth.

[0051] Step 2: Construct a first judgment function f1(T) using the growth temperature threshold to determine whether temperature adjustment is needed at the current moment. t A second judgment function f2(H) is constructed using the growth humidity threshold to determine whether humidity adjustment is needed at the current moment. t );in,

[0052] The expression for the first judgment function is:

[0053]

[0054] The expression for the second judgment function is:

[0055]

[0056] Where, when f1(T) t When f2(H) ≠ 0, determine whether temperature adjustment is needed at the current moment; when f2(H) ≠ 0, determine whether temperature adjustment is needed at the current moment. t When ) ≠ 0, determine whether humidity adjustment is needed at the current moment.

[0057] Step 3: Determine the control mode based on the value of the judgment function. The control modes include the first control mode that only requires temperature adjustment, the second control mode that only requires humidity adjustment, and the third control mode that requires both temperature and humidity adjustment.

[0058] The principle for determining the control mode is as follows:

[0059] When f1(T) t )≠0, and f2(H t When ) = 0, it means that the temperature inside the greenhouse is not within the set growth temperature threshold, but the humidity is within the set growth humidity threshold. At this time, the control mode is the first control mode that only needs to adjust the temperature.

[0060] When f1(T) t ) = 0, and f2(H t When 0 ≠ 0, it means that the temperature inside the greenhouse is within the set growth temperature threshold, but the humidity is not within the set growth humidity threshold. In this case, the control mode is the second control mode, which only requires humidity adjustment.

[0061] When f1(T) t )≠0, and f2(H t When 0 ≠ 0, it means that the temperature inside the greenhouse is not within the set growth temperature threshold, and the humidity is not within the set growth humidity threshold. At this time, the control mode is the third control mode, which requires simultaneous adjustment of temperature and humidity.

[0062] Step 4: Set the parameter adjustment step size for different control modes respectively. in, This is the temperature adjustment step size in the first control mode; This refers to the humidity adjustment step size in the second control mode. These are the temperature and humidity adjustment step sizes for the third control mode, respectively; where,

[0063] The parameter adjustment step size is based on the ambient temperature T at the current time t. t and ambient humidity H t With growth temperature threshold and growth humidity threshold The distance is determined based on the following principles:

[0064] when hour,

[0065] when hour,

[0066] when hour,

[0067] when hour,

[0068] Step 5: Construct constraint functions under different control modes, including the first constraint function f1(ΔH) under the first control mode. t ), the second constraint function f2(ΔT) under the second control mode t The third constraint function f3(ΔT) in the third control mode t ,ΔH t ), where f1(ΔH) t f2(ΔT) t f3(ΔT) t ,ΔH t The function takes values ​​of 0 or 1; where,

[0069] The expression for the first constraint function is:

[0070]

[0071] The expression for the second constraint function is:

[0072]

[0073] The expression for the third constraint function is:

[0074]

[0075] In the formula, H t-1 Let be the ambient humidity at time t-1; K1 is the first constraint coefficient, and K1≥0; T t-1 K is the ambient temperature at time t-1; K2 is the second constraint coefficient, and K2≥0; K3 is the third constraint coefficient, and K3≥0.

[0076] Step 6: Real-time acquisition of the ambient temperature T at the current time t. t and ambient humidity H t The control mode at the current moment is determined by the value of the judgment function.

[0077] Step 7: Using the constraint function value of the control mode at the current moment as 0 as the constraint condition, adjust the parameters that need to be adjusted at the current moment according to the set parameter adjustment step size. and It should be noted that when making adjustments, the relationship between the parameter to be adjusted and the set threshold can be used to determine whether it is a positive or negative adjustment. When the parameter to be adjusted is ambient temperature, if... The adjustment process is a positive adjustment with an increase in temperature, and the temperature after the first adjustment is T. t Increase the adjustment step size by one, and so on; if The adjustment process is a reverse adjustment with decreasing temperature, and the temperature after the first adjustment is T. t Subtract one adjustment step, and so on; similarly, when the parameter to be adjusted is ambient humidity, if The adjustment process is a positive adjustment that increases humidity, and the humidity after the first adjustment is H. t Increase the adjustment step size by one, and so on; if The adjustment process is a reverse adjustment that decreases humidity, and the humidity after the first adjustment is H. t Subtract one adjustment step, and so on.

[0078] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A temperature and humidity control system for mechanized rice seedling raising factory, characterized in that, The control flow of the system comprises the following steps: Step 1: Set the appropriate temperature thresholds for rice seedling growth at each stage of cultivation. and growth humidity threshold , Represented as the first The minimum and maximum suitable growth temperatures during the cultivation stage; Represented as the first The minimum and maximum suitable humidity levels for growth during the cultivation stage; Step two: constructing a first judging function for determining whether temperature adjustment is needed at the current time by using the growth temperature threshold , constructing a second judging function for determining whether humidity adjustment is needed at the current time by using the growth humidity threshold , determining a control mode according to the value results of the first judging function and the second judging function, the control mode including a first control mode in which only temperature adjustment is needed, a second control mode in which only humidity adjustment is needed, and a third control mode in which temperature and humidity adjustment are both needed Step three: setting the parameter adjustment step length in different control modes respectively wherein, is the temperature adjustment step length in the first control mode; is the humidity adjustment step length in the second control mode; are the temperature adjustment step length and the humidity adjustment step length in the third control mode respectively Step four: constructing constraint functions under different control modes, including a first constraint function under a first control mode , a second constraint function under a second control mode , a third constraint function under a third control mode , wherein, the function values of the functions are all 0 or 1; Step five: collecting the ambient temperature at the current time t in real time and the ambient humidity , using the value of the judgment function to determine the control mode at the current time, taking the constraint function value of the control mode at the current time as 0 as the constraint condition, and adjusting the parameters that need to be adjusted at the current time to , and ; The expression of the first constraint function is: ; The expression of the second constraint function is: ; The expression of the third constraint function is: ; wherein is the ambient humidity at time t-1 ; is a first constraint coefficient, and is the ambient temperature at time t-1 ; is a second constraint coefficient, and is a third constraint coefficient, and ; The parameter adjustment step is determined according to the distance between the ambient temperature at the current time t and the ambient humidity from the growth temperature threshold and the growth humidity threshold , and the determination principle is as follows: When time, ; When time, ; When Time, ; When time, ; The expression of the first judging function is: ; The expression of the second judging function is: ; wherein, when the current time is determined to require temperature adjustment; and when the current time is determined to require humidity adjustment.

2. The system according to claim 1, wherein the system is characterized by: The determination principle of the control mode is: When , and , the control mode is a first control mode in which only temperature adjustment is required; When , and , the control mode is a second control mode in which only humidity adjustment is required. When , and , the control mode is a third control mode in which temperature and humidity adjustment need to be performed simultaneously.

3. The system according to claim 1, wherein the system is characterized by: The system comprises a growth threshold setting module, a control mode determination module, an adjustment step setting module, a constraint condition construction module, a real-time data acquisition module, and an environmental parameter adjustment module. The growth threshold setting module is configured to set suitable growth temperature threshold values for rice seedlings at each cultivation stage and growth humidity threshold values ; The control mode determination module is configured to construct a first determination function for determining whether temperature adjustment is needed at the current time by using a growth temperature threshold , construct a second determination function for determining whether humidity adjustment is needed at the current time by using a growth humidity threshold , determine the control mode according to the value results of the first determination function and the second determination function. The adjustment step setting module is configured to set the parameter adjustment step under different control modes. The constraint condition construction module is configured to construct a constraint function under different control modes. The real-time data acquisition module is used for acquiring the ambient temperature at the current time t and the ambient humidity ; The environmental parameter adjustment module is configured to determine the control mode at the current time by using the value of the judgment function, take the constraint function value of the control mode at the current time as 0 as a constraint condition, and adjust the parameter to be adjusted at the current time to the set threshold interval by using the set parameter adjustment step.

4. The system according to claim 1, wherein the system is characterized by: The system comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor can implement the steps of the control flow when executing the program.

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