Temperature and humidity control system special for factory-like seedling raising of machine-transplanted rice

Abstract

The invention discloses a temperature and humidity control system special for factory-like seedling raising of machine-transplanted rice, and relates to the technical field of factory-like seedling raising of rice. A first judgment function used for judging whether temperature adjustment needs to be carried out at the current moment and a second judgment function used for judging whether humidity adjustment needs to be carried out at the current moment are constructed by setting appropriate growth temperature thresholds and growth humidity thresholds of rice seedlings at all cultivation stages; determining a control mode according to the value result of the judgment function, setting parameter adjustment step lengths in different control modes, constructing constraint functions in different control modes, collecting the environment temperature Tt and the environment humidity Ht at the current moment t in real time, and determining the control mode at the current moment by utilizing the value result of the judgment function. And by taking a constraint function value 0 of the control mode at the current moment as a constraint condition, adjusting a parameter needing to be adjusted at the current moment to be within a set threshold interval by using a set parameter adjustment step length.

Description

Technical Field

[0001] The invention relates to the technical field of factory-based rice seedling cultivation, and in particular to a temperature and humidity control system dedicated to factory-based rice seedling cultivation by machine transplanting. Background Art

[0002] With the adjustment of agricultural planting structure and the transfer of rural labor, farmers are increasingly demanding the mechanization of rice planting. The factory-based mechanized transplanting and raising rice seedlings technology has the advantages of low seedling raising cost, good quality, low labor intensity, and labor and cost saving. It is a key link in realizing the full mechanization of rice production. By promoting the factory-based mechanized transplanting and raising rice seedlings technology, it can promote the improvement of rice production seeds, the scale of raising rice seedlings, and the commercialization of rice seedling supply, which is conducive to the implementation of good varieties and good methods, and effectively solves the problems of poor management, competition for rice fields, and insufficient labor in the traditional scattered rice seedling raising method of farmers, and has a positive role in promoting the scientific level of grain production.

[0003] During the factory-based rice seedling raising period, in order to ensure the quality of the seedlings, the temperature of the seedlings needs to be strictly controlled. Generally, the main focus is on heat preservation during the rice sowing to seedling emergence period. The sown seedling trays need to be moved into the temperature-controlled greenhouse, and the temperature in the greenhouse is controlled at 30-32℃ for about 48 hours until the seedlings are green. If the temperature in the greenhouse exceeds 35℃ on a hot sunny day, it is necessary to cool down in time to prevent high temperature from burning the seedlings; the seedlings are hardened from the emergence to the 1-leaf 1-heart stage, and the temperature in the greenhouse is controlled at 25-28℃ to promote the normal growth of the root system. When the temperature in the greenhouse exceeds 28℃, the cooling system is turned on to cool down; from the 1-leaf 1-heart to the 2-leaf 1-heart stage, the seedling trays are moved into the field insect-proof net seedling hardening shed, and the temperature in the shed is controlled at 20-25℃. When the shed temperature exceeds 25℃, it is necessary to cool down in time. From 2 leaves 1 heart to transplanting, the shed temperature is controlled at about 20℃, and the film is gradually uncovered during the day and covered at night. The film is fully uncovered 3-5 days before transplanting for hardening. If the temperature is low, the film should be covered in time for insulation. In addition, the moisture content in the greenhouse needs to be strictly controlled. The soil needs to be kept moist around the two-leaf stage of the seedlings, and the moisture content of the seedling tray soil should be controlled within the range of 35% to 40%.

[0004] At present, the temperature control methods of temperature-controlled greenhouses used for factory-based rice seedling cultivation mainly include ventilation temperature control and spray temperature control. The threshold method is usually used for temperature and humidity control. The intelligent degree of the control process is low, and different temperature control methods have different effects on the temperature control effect. In addition, when the spray temperature control method is used, it will cause a large change in the humidity in the greenhouse, which will affect the moisture content index of the seedling tray soil. Therefore, how to choose the appropriate temperature control method and control parameters at the right time so that the temperature and humidity in the temperature-controlled greenhouse are always kept within the most suitable growth range for the seedlings to achieve refined and intelligent control is a technical problem that needs to be solved urgently. To this end, we propose a temperature and humidity control system specifically for factory-based rice seedling cultivation with machine-transplanted rice. Summary of the invention

[0005] The main purpose of the present invention is to provide a temperature and humidity control system dedicated to factory-based rice seedling cultivation by machine transplanting, which can effectively solve the problems in the background technology.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A temperature and humidity control system for machine-transplanted rice factory seedling cultivation, the control process of the system includes the following steps:

[0008] Step 1: Set the appropriate growth temperature threshold for rice seedlings at each cultivation stage and growth humidity threshold They represent the minimum and maximum values ​​of the suitable growth temperature in the i-th cultivation stage respectively; They represent the minimum and maximum values ​​of humidity suitable for growth in the i-th cultivation stage respectively;

[0009] Step 2: Using the growth temperature threshold to construct a first judgment function f1(T t ), using the growth humidity threshold to construct a second judgment function f2 (H t ), determining a control mode according to the value result of the judgment function, wherein the control mode includes a first control mode that only requires temperature regulation, a second control mode that only requires humidity regulation, and a third control mode that requires both temperature and humidity regulation;

[0010] Step 3: Set the parameter adjustment step size under different control modes respectively in, is the temperature adjustment step length in the first control mode; is the humidity adjustment step length in the second control mode; They are respectively the temperature adjustment step length and the humidity adjustment step length in the third control mode;

[0011] Step 4: Constructing constraint functions under different control modes, including the first constraint function f1(ΔH t ), the second constraint function f2 (ΔT t ), the third constraint function f3 (ΔT t ,ΔH t ), where f1(ΔH t )、f2(ΔT t )、f3(ΔT t ,ΔH t ) function values ​​are all 0 or 1;

[0012] Step 5: Real-time collection 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 using the value of the judgment function, and the constraint function value of the control mode at the current moment is 0 as the constraint condition, and the parameters that need to be adjusted at the current moment are adjusted to the set parameter adjustment step. and

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

[0014]

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

[0016]

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

[0018] The principles for determining the control mode are:

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

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

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

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

[0023]

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

[0025]

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

[0027]

[0028] In the formula, H t-1 is the ambient humidity at time t-1; K1 is the first constraint coefficient, and K1≥0; T t-1 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 Growth temperature threshold and growth humidity threshold The distance is determined by 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 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 (T1) for determining whether temperature adjustment is required at the current moment by using the growth temperature threshold. t ), using the growth humidity threshold to construct a second judgment function f2 (H t ), determining the control mode according to the value result of the judgment function;

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

[0038] The constraint condition building module is used to build 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 using the value result 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.

[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 the prior art, the invention sets a growth temperature threshold and a growth humidity threshold suitable for rice seedlings in each cultivation stage, uses the growth temperature threshold to construct a first judgment function for determining whether temperature regulation is required at the current moment, and uses the growth humidity threshold to construct a second judgment function for determining whether humidity regulation is required at the current moment. The control mode is determined according to the value result of the judgment function. The control mode includes a first control mode for only temperature regulation, a second control mode for only humidity regulation, and a third control mode for both temperature and humidity regulation. The parameter adjustment step lengths under different control modes are set respectively. The constraint functions constructed under different control modes include a first constraint function f1(ΔH t ), the second constraint function f2 (ΔT t ), the third constraint function f3 (ΔT t ,ΔH t ), 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 using the value result of the judgment function, and the constraint function value of the control mode at the current moment is 0 as the constraint condition. The parameters that need to be adjusted at the current moment are adjusted to the set threshold range with the set parameter adjustment step. The appropriate temperature and humidity control mode can be selected, and the constraint function is used to limit the adjustment parameters of the control process, so that the temperature and humidity in the temperature-controlled greenhouse are always maintained within the most suitable growth range for the seedlings, thereby realizing the refined and intelligent control of the rice seedling cultivation environment in the factory-based seedling cultivation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a control flow chart of a temperature and humidity control system for machine-transplanted rice factory-based seedling cultivation according to the present invention;

[0045] Figure 2This is a structural block diagram of a temperature and humidity control system for factory-based rice seedling cultivation using machine-transplanted rice according to the present invention;

[0046] Figure 3 The figure is a logic block diagram of the control process of the solution of the present invention. DETAILED DESCRIPTION

[0047] The present invention will be further described below in conjunction with specific implementation methods, wherein the accompanying drawings are only used for exemplary descriptions and represent only schematic diagrams rather than actual drawings, and should not be understood as limiting the present invention. In order to better illustrate the specific implementation methods of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product.

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

[0049] Step 1: Set the appropriate growth temperature threshold for rice seedlings at each cultivation stage and growth humidity threshold They represent the minimum and maximum values ​​of the suitable growth temperature in the i-th cultivation stage respectively; They represent the minimum and maximum values ​​of humidity suitable for growth in the i-th cultivation stage respectively;

[0050] Generally, the main focus is on keeping warm from rice sowing to seedling emergence, and the temperature in the temperature-controlled greenhouse is controlled at about 30-32°C for best results; hardening of seedlings begins from seedling emergence to the 1-leaf 1-heart stage, and the temperature in the greenhouse is controlled at 25-28°C. When the temperature in the greenhouse exceeds 28°C, the cooling system is turned on to cool down; the seedling trays are moved into the seedling hardening shed from the 1-leaf 1-heart to 2-leaf 1-heart stage, and the temperature in the shed is controlled at 20-25°C. When the temperature in the shed exceeds 25°C, it is necessary to cool down in time; from 2 leaves 1-heart to transplanting, the temperature in the shed is controlled at around 20°C; 3-5 days before transplanting, the film is fully uncovered for seedling hardening. If low temperatures are encountered, the film should be covered in time for insulation, and the temperature should be controlled at around 25°C. As for the moisture content in the shed, the soil needs to be kept moist around the 2-leaf stage of the seedlings, and the moisture content of the soil in the seedling trays should be controlled within the range of 35% to 40%; the growth temperature threshold and growth humidity threshold at different stages can be set according to the above-mentioned optimal temperature and humidity;

[0051] Step 2: Use the growth temperature threshold to construct a first judgment function f1 (T t ), using the growth humidity threshold to construct a second judgment function f2 (H t );in,

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

[0053]

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

[0055]

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

[0057] Step 3: Determine the control mode according to the value result of the judgment function, the control mode includes a first control mode that only needs to adjust the temperature, a second control mode that only needs to adjust the humidity, and a third control mode that needs to adjust both the temperature and humidity;

[0058] The principles for determining the control mode are:

[0059] When f1(T t )≠0, and f2(H t )=0, it means that the temperature in the greenhouse is not within the set growth temperature threshold, and 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 )≠0, it means that the temperature in the greenhouse is 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 second control mode that only needs to adjust the humidity;

[0061] When f1(T t )≠0, and f2(H t )≠0, it means that the temperature in 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 that requires simultaneous temperature and humidity adjustment.

[0062] Step 4: Set the parameter adjustment step size under different control modes in, is the temperature adjustment step length in the first control mode; is the humidity adjustment step length in the second control mode; are respectively the temperature adjustment step length and the humidity adjustment step length in the third control mode; wherein,

[0063] The parameter adjustment step is based on the ambient temperature T at the current time t t and ambient humidity H t Growth temperature threshold and growth humidity threshold The distance is determined by 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 t ), the second constraint function f2 (ΔT t ), the third constraint function f3 (ΔT t ,ΔH t ), where f1(ΔH t )、f2(ΔT t )、f3(ΔT t ,ΔH t ) all have values ​​of 0 or 1;

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

[0070]

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

[0072]

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

[0074]

[0075] In the formula, H t-1 is the ambient humidity at time t-1; K1 is the first constraint coefficient, and K1≥0; T t-1 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 collection of the ambient temperature T at the current time t t and ambient humidity H t , using the result of the judgment function to determine the control mode at the current moment;

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

[0078] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A temperature and humidity control system for machine-transplanted rice seedling cultivation in factories, characterized in that: The control process of the system includes the following steps: Step 1: Set the appropriate growth temperature threshold for rice seedlings at each cultivation stage and growth humidity threshold They represent the minimum and maximum values ​​of the suitable growth temperature in the i-th cultivation stage respectively; They represent the minimum and maximum values ​​of humidity suitable for growth in the i-th cultivation stage respectively; Step 2: Using the growth temperature threshold to construct a first judgment function f1(T t ), using the growth humidity threshold to construct a second judgment function f2 (H t ), determining a control mode according to the value result of the judgment function, wherein the control mode includes a first control mode that only requires temperature regulation, a second control mode that only requires humidity regulation, and a third control mode that requires both temperature and humidity regulation; Step 3: Set the parameter adjustment step size under different control modes respectively in, is the temperature adjustment step length in the first control mode; is the humidity adjustment step length in the second control mode; They are respectively the temperature adjustment step length and the humidity adjustment step length in the third control mode; Step 4: Constructing constraint functions under different control modes, including the first constraint function f1(ΔH t ), the second constraint function f2 (ΔT t ), the third constraint function f3 (ΔT t ,ΔH t ), where f1(ΔH t )、f2(ΔT t )、f3(ΔT t ,ΔH t ) function values ​​are all 0 or 1; Step 5: Real-time collection 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 using the value of the judgment function, and the constraint function value of the control mode at the current moment is 0 as the constraint condition, and the parameters that need to be adjusted at the current moment are adjusted to the set parameter adjustment step. and 2. A temperature and humidity control system for machine-transplanted rice seedling cultivation in factories according to claim 1, characterized in that: The expression of the first judgment function is: The expression of the second judgment function is: Among them, when f1(T t )≠0, determine whether temperature adjustment is needed at the current moment; when f2(H t )≠0, determine whether humidity adjustment is needed at the current moment.

3. A temperature and humidity control system for machine-transplanted rice seedling cultivation in factories according to claim 1, characterized in that: The principles for determining the control mode are: When f1(T t )≠0, and f2(H t )=0, the control mode is the first control mode which only needs to perform temperature adjustment; When f1(T t )=0, and f2(H t )≠0, the control mode is the second control mode which only requires humidity adjustment; When f1(T t )≠0, and f2(H t )≠0, the control mode is the third control mode which requires simultaneous temperature and humidity adjustment.

4. A temperature and humidity control system for machine-transplanted rice seedling cultivation in factories according to claim 1, characterized in that: The expression of the first constraint function is: The expression of the second constraint function is: The expression of the third constraint function is: In the formula, H t-1 is the ambient humidity at time t-1; K1 is the first constraint coefficient, and K1≥0; T t-1 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.

5. A temperature and humidity control system for machine-transplanted rice seedling cultivation in factories according to claim 1, characterized in that: The parameter adjustment step size is based on the ambient temperature T at the current time t t and ambient humidity H t Growth temperature threshold and growth humidity threshold The distance is determined by the following principles: when hour, when hour, when hour, when hour, 6. A temperature and humidity control system for machine-transplanted rice factory seedling cultivation according to claim 1, characterized in that: The system includes 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 used to set the appropriate growth temperature threshold for rice seedlings at each cultivation stage. and growth humidity threshold The control mode determination module is used to construct a first judgment function f1 (T1) for determining whether temperature adjustment is required at the current moment by using the growth temperature threshold. t ), using the growth humidity threshold to construct a second judgment function f2 (H t ), determining the control mode according to the value result of the judgment function; The adjustment step setting module is used to set the parameter adjustment step under different control modes; The constraint condition building module is used to build constraint functions under different control modes; 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 ; The environmental parameter adjustment module is used to determine the control mode at the current moment using the value result 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.

7. A temperature and humidity control system for machine-transplanted rice seedling cultivation in factories according to claim 1, characterized in that: The system comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the steps of the control flow described in claim 1 can be implemented when the processor executes the program.

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