Environment parameter control method and system for tobacco leaf microenvironment maintenance and medium

Abstract

The invention discloses an environmental parameter control method and system for tobacco leaf microenvironment maintenance and a medium. Relates to the technical field of tobacco mellowing maintenance. The method is improved on the basis of traditional automatic temperature control, according to the scheme, part of target tobacco leaf boxes are screened out, actually measured temperature data and microenvironment data of the target tobacco leaf boxes are collected in real time in the tobacco leaf microenvironment maintenance process, and a temperature field of the whole microenvironment is reconstructed in combination with basic information of tobacco leaf microenvironment maintenance; the temperatures of the outer surfaces of all the tobacco boxes and tobacco box cores in the tobacco stack can be conveniently mastered, an environmental parameter regulation and control strategy of the microenvironment is formulated according to the temperature field, and the temperature accuracy in the tobacco mellowing process is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco leaf aging and curing, and in particular to an environmental parameter control method, system and medium for tobacco leaf microenvironment curing. Background Art

[0002] Before redried tobacco strips are used in cigarette production, they usually need to go through a 2-3 year aging process to reconcile chemical components, remove impurities from tobacco leaves, and reduce irritation; no mildew, no carbonization, and no insect pests are the most basic requirements during tobacco leaf aging. In order to create a suitable aging environment, the tobacco leaf curing process often requires monitoring and regulation of temperature, humidity, oxygen, and phosphine. During the storage of redried tobacco strips, if the temperature of the redried tobacco strips is higher than 35°C and the moisture content of the tobacco strips is greater than 15%, the tobacco leaves may be carbonized. If tobacco leaves are carbonized, it will not only affect the safety of tobacco strip storage, but also cause the tobacco strips to lose their use value.

[0003] With the development of science and technology, the intelligent micro-environment maintenance system has been gradually improved. Each cigarette stack in the warehouse has been independently monitored and managed. However, for the temperature control in the cigarette stack, the existing detection means are generally based on infrared measurement of the temperature of the packed tobacco leaves. Infrared measurement can only measure the temperature of the tobacco leaves on the surface of the box, but cannot detect the box core temperature of the tobacco box. Generally, there are a large number of tobacco boxes in the shelf-type cigarette stack, even more than 500 boxes, and it is not realistic to install collectors in each tobacco box. Generally, for every 100 boxes of tobacco leaves, only 5 boxes of tobacco leaves will be equipped with collectors to collect the box core temperature. Combined with the influence of gases in the cigarette stack, the temperature in the cigarette stack is controlled by the temperature data of the cigarette stack and the box core detected by traditional methods, which has certain accuracy problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is: for the temperature control in a tobacco stack, the existing detection means generally directly regulates the temperature of the packed tobacco leaves and the temperature in the tobacco stack based on infrared measurement, while infrared measurement can only measure the temperature of the tobacco leaves on the surface of the box, but cannot detect the temperature in the center of the box. In addition, the influence of the gas in the tobacco stack leads to inaccurate detection data, which affects the accuracy of temperature control. The purpose of the present invention is to provide an environmental parameter control method, system and medium for tobacco leaf microenvironment maintenance, by screening out some target tobacco leaf boxes, collecting the measured temperature data and microenvironment data of the target tobacco leaf boxes in real time during the tobacco leaf microenvironment maintenance, and reconstructing the temperature field of the entire microenvironment in combination with the basic information of tobacco leaf microenvironment maintenance; it is convenient to grasp the temperature of all tobacco leaf box surfaces and tobacco leaf box cores in the tobacco stack, formulate an environmental parameter control strategy for the microenvironment according to the temperature field, and ensure the accuracy of the temperature during the tobacco leaf aging process.

[0005] The present invention is achieved through the following technical solutions:

[0006] This scheme provides a method for controlling environmental parameters of tobacco leaf microenvironment maintenance, including:

[0007] Obtain basic information on tobacco leaf microenvironment maintenance and determine the target tobacco leaf box within the microenvironment;

[0008] During the process of tobacco leaf microenvironment maintenance, the microenvironment temperature and the box core temperature of the target tobacco box are collected in real time; and the microenvironment temperature and the box core temperature are pre-processed;

[0009] Reconstruct the microenvironment temperature field based on the pre-processed microenvironment temperature and the box core temperature;

[0010] The environmental parameters of the microenvironment are adjusted according to the microenvironment temperature field.

[0011] In this scheme, the tobacco warehouse contains multiple tobacco stacks. The microenvironment in this scheme refers to the microenvironment constituted by each tobacco stack. The environmental parameters in this scheme include temperature and humidity.

[0012] Working principle of this scheme: For temperature control in a tobacco stack, existing detection means generally directly regulate the temperature of the packed tobacco leaves and the temperature inside the tobacco stack based on infrared measurement, while infrared measurement can only measure the temperature of the tobacco leaves on the surface of the box, but cannot detect the temperature in the center of the box. In addition, the influence of the gas in the tobacco stack leads to inaccurate detection data, which affects the accuracy of temperature control. The purpose of the present invention is to provide an environmental parameter control method, system and medium for tobacco leaf microenvironment maintenance, by screening out some target tobacco leaf boxes, collecting the measured temperature data and microenvironment data of the target tobacco leaf boxes in real time during the tobacco leaf microenvironment maintenance, and reconstructing the temperature field of the entire microenvironment in combination with the basic information of tobacco leaf microenvironment maintenance; it is easy to grasp the temperature of all tobacco leaf box surfaces and tobacco leaf box cores in the tobacco stack, and formulate an environmental parameter control strategy for the microenvironment according to the temperature field to ensure the accuracy of the environmental parameters of the tobacco leaf aging process.

[0013] A further optimization scheme is to obtain basic information on the maintenance of tobacco leaf microenvironment and determine the target tobacco leaf box in the microenvironment; including the following method:

[0014] Obtain tobacco box information and tobacco leaf information in the microenvironment; the tobacco box information includes: tobacco box size, tobacco box quantity s, and tobacco stack size; the tobacco leaf information includes: tobacco leaf variety, tobacco leaf grade d, and tobacco leaf sealing time t;

[0015] Calculating a tobacco leaf temperature factor R based on the tobacco box information and tobacco leaf information;

[0016]

[0017] Where V represents the volume of the chimney; Z max Indicates the largest value among the tobacco box dimensions; Z minIndicates the smallest value among the tobacco box dimensions; Z med Indicates the middle value among the tobacco box dimensions; M C represents the specific heat capacity of tobacco variety C; for example, if the tobacco box is 1m long, 0.5m wide and 0.8m high, then the corresponding Z max Indicates the length of the tobacco box, which is 1m; the corresponding Z min Indicates the length of the tobacco box, which is 0.5m; Z max Indicates the height of the tobacco box, which is 0.8m.

[0018] The number and location of target tobacco boxes are determined based on the tobacco temperature factor R.

[0019] The sealing time of tobacco leaves corresponds to the curing stage of tobacco leaves. The sealing time is different in different curing stages, and different tobacco varieties react to temperature to different degrees. This scheme combines tobacco box information and tobacco leaf information to determine the number and location of target tobacco boxes, ensuring that the actual collected box core temperature can characterize the box core temperature of the entire tobacco stack to the greatest extent, laying the foundation for subsequent temperature field reconstruction.

[0020] A further optimization scheme is that the number and position of the target tobacco boxes are determined according to the tobacco temperature factor R, including the following method:

[0021] A first threshold range and a second threshold range are preset. If the tobacco temperature factor R is within the first threshold range, the number of target tobacco boxes is determined to be a; if the tobacco temperature factor R is within the second threshold range, the number of target tobacco boxes is determined to be b; wherein the first threshold range>the second threshold range, and a>b, b≥n, and n is the minimum number of target tobacco boxes;

[0022] Get the size of the cigarette stack and construct the largest cube of the cigarette stack; ignore the shelves where the tobacco boxes are stacked, and only construct the largest cube with all the tobacco boxes in the cigarette stack. If there is a vacancy on the top, if the total volume of the tobacco boxes on the top layer is ≥ 1 / 3 of the stackable volume of the top layer, then the largest cube includes the top layer; if the total volume of the tobacco boxes on the top layer is < 1 / 3 of the stackable volume of the top layer, then the largest cube does not include the top layer.

[0023] The diagonal line of the largest cube, the line connecting the centers of opposite faces, the line connecting the diagonals of the bottom face, and the line connecting the midpoints of the sides of the bottom face are used as the target lines;

[0024] A or b tobacco boxes are determined on the target line as target tobacco boxes. The rules for determining the target tobacco boxes include:

[0025] The distances between the target tobacco boxes located on the body diagonal are equal; the distances between the target tobacco boxes located on the line connecting the face centers are equal; the distances between the target tobacco boxes on the line connecting the bottom diagonal are equal;

[0026] The total number of target tobacco boxes located on the body diagonal line ≥ the total number of target tobacco boxes located on the line connecting the face centers;

[0027] The total number of target tobacco boxes located on the body diagonal line ≥ the total number of target tobacco boxes located on the line connecting the face centers;

[0028] The total number of target tobacco boxes on the line connecting the bottom diagonals is ≥ the total number of target tobacco boxes on the line connecting the midpoints of the bottom edges.

[0029] A further optimization scheme is that the determination rule of the target tobacco box also includes: tobacco boxes on other surfaces of the largest cube except the bottom surface are not determined as target tobacco boxes. Since the bottom surface of the cigarette stack contacts the warehouse floor, the entire warehouse contains multiple cigarette stacks (microenvironments), so the warehouse temperature is different from the required temperature of the current cigarette stack (microenvironment), and the cigarette box close to the warehouse floor will be affected by the ground temperature. Therefore, in addition to uniformly collecting the box core temperature of the tobacco box inside the cigarette stack, this scheme also collects the box core temperature of the tobacco box on the bottom of the cigarette stack to ensure the accuracy of the measured temperature; since the tobacco box on the surface of the cigarette stack is not much different from the ambient temperature of the cigarette stack, the microenvironment temperature can represent the box core temperature. In order to save costs, no temperature collector is set in the tobacco box on the surface of the cigarette stack.

[0030] A further optimization scheme is that during the process of tobacco leaf microenvironment maintenance, the microenvironment temperature and the box core temperature of the target tobacco leaf box are collected in real time; and the microenvironment temperature and the box core temperature are preprocessed; including the method:

[0031] Multiple temperature collectors are evenly arranged on the surface of the tobacco stack to collect the temperature of the tobacco stack; temperature collectors are arranged in the target tobacco box to collect the box core temperature;

[0032] A first temperature threshold range is preset, and when the temperatures of the cigarette stacks are all within the first temperature threshold range, an average value of the temperatures of the cigarette stacks is calculated as the micro-environment temperature;

[0033] A second temperature threshold range is preset to determine whether the temperature of each box core is within the second temperature threshold range. If so, the preprocessing is completed; otherwise, an abnormal box core temperature alarm is issued.

[0034] A further optimization scheme is to reconstruct the microenvironment temperature field based on the pre-processed microenvironment temperature and the box core temperature, including the following methods:

[0035] The microenvironment is trained and learned, and an overcomplete dictionary D is analyzed based on the prior information F; where F = DX; X represents the sparse coding of the temperature field of the prior information F;

[0036] Obtain the temperature inside the microenvironment and the temperature of the box core, and construct initial measured data;

[0037] Calculate the temperature field sparse code X based on the initial measured data and the over-complete dictionary D;

[0038] The microenvironment temperature field is restored according to the temperature field sparse coding X.

[0039] A further optimization scheme is to obtain the temperature in the microenvironment and the box core temperature and construct initial measured data, including the following method:

[0040] Obtain the temperature inside the microenvironment and the temperature of the box core;

[0041] Initialize a random Gaussian matrix Φ with is the objective function, and the objective function f is minimized iteratively to obtain the observation matrix Φ; E represents the error matrix; represents the square of the F norm;

[0042] Taking the temperature in the microenvironment and the box core temperature as observation vectors and the overcomplete dictionary D as the transformation basis, the greedy pursuit algorithm is used to solve the box core temperatures of all tobacco leaves in the largest cube.

[0043] The temperatures of all tobacco box cores within the largest cube are taken as initial measured data.

[0044] A further optimization scheme is that the environmental parameters of the microenvironment are adjusted according to the microenvironment temperature field, including the method:

[0045] The microenvironment is evenly divided into multiple cubes of equal size; each cube contains at least n tobacco boxes, n≥4;

[0046] Filter out the cubes with excessive temperatures according to the temperature field of the microenvironment;

[0047] Determine the position of the current cube: if at least one surface of the current cube belongs to the surface of the microenvironment, turn on the environmental parameter adjustment device closest to the current cube to adjust the environmental parameters of the tobacco leaf microenvironment; if all surfaces of the current cube do not belong to the surface of the microenvironment, turn on all environmental parameter adjustment devices to adjust the environmental parameters of the tobacco leaf microenvironment.

[0048] This solution also provides an environmental parameter control system for tobacco leaf microenvironment maintenance, which is used to implement the above-mentioned environmental parameter control method for tobacco leaf microenvironment maintenance; the system includes:

[0049] The screening module is used to obtain basic information on the maintenance of tobacco leaf microenvironment and determine the target tobacco leaf box within the microenvironment;

[0050] The acquisition module is used to collect the microenvironment temperature and the box core temperature of the target tobacco box in real time during the process of tobacco leaf microenvironment maintenance; and to pre-process the microenvironment temperature and the box core temperature;

[0051] A temperature reconstruction module is used to reconstruct the microenvironment temperature field based on the preprocessed microenvironment temperature and the box core temperature;

[0052] The adjustment module is used to adjust the environmental parameters of the microenvironment according to the microenvironment temperature field.

[0053] The present solution also provides a computer-readable medium having a computer program stored thereon, and the computer program is executed by a processor to implement the environmental parameter control method for microenvironment maintenance of tobacco leaves as described above.

[0054] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0055] 1. The present invention provides a method, system and medium for controlling environmental parameters of tobacco leaf microenvironment maintenance; based on the traditional automatic temperature control method, the present invention screens out some target tobacco leaf boxes during the tobacco leaf microenvironment maintenance process, collects the measured temperature data and microenvironment data of the target tobacco leaf boxes in real time during the tobacco leaf microenvironment maintenance process, and reconstructs the temperature field of the entire microenvironment in combination with the basic information of tobacco leaf microenvironment maintenance; it is convenient to grasp the temperature of the surface of all tobacco leaf boxes and the tobacco leaf box core in the tobacco stack, formulate the environmental parameter control strategy of the microenvironment according to the temperature field, and ensure the accuracy of the environmental parameters of the tobacco leaf aging process.

[0056] 2. The present invention provides an environmental parameter control method, system and medium for tobacco leaf microenvironment maintenance; after obtaining the temperature inside the microenvironment and the box core temperature, the microenvironment temperature field is not reconstructed directly based on the temperature inside the microenvironment and the box core temperature, but initial measured data is constructed according to the temperature inside the microenvironment and the box core temperature, and the microenvironment temperature field is reconstructed based on the constructed initial measured data to obtain a more accurate temperature field reconstruction result; this solution also solves the box core temperatures of all tobacco leaves in the largest cube through the OMP algorithm based on its Schmidt orthogonalization processing method, thereby improving the reconstruction efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0058] Figure 1 A flow chart of the environmental parameter control method for tobacco leaf microenvironment maintenance;

[0059] Figure 2 Schematic diagram of the environmental parameter control system structure for tobacco leaf microenvironment maintenance. DETAILED DESCRIPTION

[0060] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0061] For the temperature control in the cigarette stack, the existing detection means generally regulates the temperature of the packed tobacco leaves by infrared measurement. However, infrared measurement can only measure the temperature of the tobacco leaves on the surface of the box, but cannot detect the temperature in the center of the box. In addition, the influence of the gas in the cigarette stack leads to inaccurate detection data, which affects the accuracy of temperature control. Deploying multiple temperature measuring devices in the cigarette stack will increase the cost significantly. In view of this, the present invention provides the following embodiments to solve the above technical problems.

[0062] Embodiment 1: This embodiment provides a method for controlling environmental parameters of tobacco leaf microenvironment maintenance, such as Figure 1 As shown, including:

[0063] Step 1, obtaining basic information of tobacco leaf microenvironment maintenance and determining a target tobacco leaf box in the microenvironment; S11, obtaining tobacco leaf box information and tobacco leaf information in the microenvironment; the tobacco leaf box information includes: tobacco leaf box size, tobacco leaf box number s, tobacco stack size; the tobacco leaf information includes: tobacco leaf variety, tobacco leaf grade d and tobacco leaf sealing time t;

[0064] S12, calculating a tobacco leaf temperature factor R based on the tobacco box information and tobacco leaf information;

[0065]

[0066] Where V represents the volume of the chimney; Z max Indicates the largest value among the tobacco box dimensions; Z min Indicates the smallest value among the tobacco box dimensions; Z med Indicates the middle value among the tobacco box dimensions; M C represents the specific heat capacity of tobacco variety C;

[0067] The sealing time of tobacco leaves corresponds to the curing stage of tobacco leaves. The sealing time is different in different curing stages, and different tobacco varieties react to temperature to different degrees. This scheme combines tobacco box information and tobacco leaf information to determine the number and location of target tobacco boxes, ensuring that the actual collected box core temperature can characterize the box core temperature of the entire tobacco stack to the greatest extent, laying the foundation for subsequent temperature field reconstruction.

[0068] S13, determining the number and position of the target tobacco boxes according to the tobacco temperature factor R. This step specifically includes a method: presetting a first threshold range and a second threshold range, if the tobacco temperature factor R is within the first threshold range, then determining the number of target tobacco boxes to be a; if the tobacco temperature factor R is within the second threshold range, then determining the number of target tobacco boxes to be b; wherein the first threshold range>the second threshold range, and a>b, b≥n, and n is the minimum number of target tobacco boxes;

[0069] Get the size of the cigarette stack and construct the largest cube of the cigarette stack; ignore the shelves where the tobacco boxes are stacked, and only construct the largest cube with all the tobacco boxes in the cigarette stack. If there is a vacancy on the top, if the total volume of the tobacco boxes on the top layer is ≥ 1 / 3 of the stackable volume of the top layer, then the largest cube includes the top layer; if the total volume of the tobacco boxes on the top layer is < 1 / 3 of the stackable volume of the top layer, then the largest cube does not include the top layer.

[0070] The diagonal line of the largest cube, the line connecting the centers of opposite faces, the line connecting the diagonals of the bottom face, and the line connecting the midpoints of the sides of the bottom face are used as the target lines;

[0071] A or b tobacco boxes are determined on the target line as target tobacco boxes. The rules for determining the target tobacco boxes include:

[0072] The distances between the target tobacco boxes located on the body diagonal are equal; the distances between the target tobacco boxes located on the line connecting the face centers are equal; the distances between the target tobacco boxes on the line connecting the bottom diagonal are equal;

[0073] The total number of target tobacco boxes located on the body diagonal line ≥ the total number of target tobacco boxes located on the line connecting the face centers;

[0074] The total number of target tobacco boxes located on the body diagonal line ≥ the total number of target tobacco boxes located on the line connecting the face centers;

[0075] The total number of target tobacco boxes on the line connecting the bottom diagonals is ≥ the total number of target tobacco boxes on the line connecting the midpoints of the bottom edges.

[0076] The target tobacco box determination rule also includes: tobacco boxes on other surfaces of the largest cube except the bottom surface are not determined as target tobacco boxes.

[0077] The number of target tobacco boxes is determined according to the above method, and the target tobacco boxes are determined on the target line. For a target line with an intersection, if the target tobacco box is located at the intersection, only one temperature collector can be arranged.

[0078] Since the bottom surface of the cigarette stack contacts the warehouse floor and the entire warehouse contains multiple cigarette stacks (microenvironments), there is a certain difference between the warehouse temperature and the required temperature of the current cigarette stack (microenvironment), and the tobacco box close to the warehouse floor will be affected by the ground temperature. Therefore, in addition to uniformly collecting the box core temperature of the tobacco box inside the cigarette stack, this scheme also collects the box core temperature of the tobacco box on the bottom of the cigarette stack to ensure the accuracy of the measured temperature; since the tobacco box on the surface of the cigarette stack is not much different from the ambient temperature of the cigarette stack, the microenvironment temperature can represent the box core temperature. In order to save costs, no temperature collector is set in the tobacco box on the surface of the cigarette stack.

[0079] Step 2: During the maintenance of the tobacco leaf microenvironment, the microenvironment temperature and the box core temperature of the target tobacco leaf box are collected in real time; and the microenvironment temperature and the box core temperature are pre-processed; this step specifically includes the following methods:

[0080] S21, evenly arrange multiple temperature collectors on the surface of the tobacco stack to collect the temperature of the tobacco stack; arrange temperature collectors in the target tobacco box to collect the box core temperature;

[0081] S22, presetting a first temperature threshold range, and when the temperatures of the cigarette stacks are all within the first temperature threshold range, calculating the average of the temperatures of the cigarette stacks as the micro-environment temperature;

[0082] S23, preset a second temperature threshold range, and determine whether the temperature of each box core is within the second temperature threshold range. If so, the preprocessing is completed, otherwise, an abnormal box core temperature alarm is issued.

[0083] Step 3: reconstruct the microenvironment temperature field based on the pre-processed microenvironment temperature and the box core temperature; this step specifically includes the following method:

[0084] S31, training and learning the microenvironment, analyzing an overcomplete dictionary D based on prior information F; wherein F = DX; X represents the sparse coding of the temperature field of the prior information F;

[0085] S32, obtaining the temperature in the microenvironment and the box core temperature, and constructing initial measured data; this step specifically includes the following method:

[0086] Obtain the temperature inside the microenvironment and the temperature of the box core;

[0087] Initialize a random Gaussian matrix Φ with is the objective function, and the objective function f is minimized iteratively to obtain the observation matrix Φ; E represents the error matrix; represents the square of the F norm;

[0088] Taking the temperature in the microenvironment and the box core temperature as observation vectors and the overcomplete dictionary D as the transformation basis, the greedy pursuit algorithm is used to solve the box core temperatures of all tobacco leaves in the largest cube.

[0089] The temperatures of all tobacco box cores within the largest cube are taken as initial measured data.

[0090] S33, calculating the temperature field sparse code X based on the initial measured data and the overcomplete dictionary D;

[0091] S34, restoring the microenvironment temperature field according to the temperature field sparse coding X.

[0092] The OMP algorithm is the mainstream research in the greedy pursuit algorithm. In each iteration of the OMP algorithm, in order to ensure the optimality of the result, the OMP algorithm uses Schmidt orthogonalization to process the selected atomic set in order to converge more quickly. Therefore, this scheme solves all tobacco box core temperatures in the largest cube based on the OMP algorithm. In order to make the current residual component and the atoms of the selected observation vector correlated to the greatest extent in each iteration, this scheme selects atoms in a greedy iterative manner, then subtracts the relevant part from the observation vector, and repeats the above process until the number of iterations is met.

[0093] Step 4: adjusting the environmental parameters of the microenvironment according to the microenvironment temperature field; this step specifically includes the following method:

[0094] S41, evenly divide the microenvironment into a plurality of cubes of equal size; each cube contains at least n tobacco boxes, n≥4;

[0095] S42, screening out the cubes with excessive temperatures according to the temperature field of the microenvironment;

[0096] S43, determine the position of the current cube: if the current cube has at least one surface that belongs to the surface of the microenvironment, turn on the environmental parameter adjustment device closest to the current cube to adjust the environmental parameters of the tobacco leaf microenvironment; if all surfaces of the current cube do not belong to the surface of the microenvironment, turn on all environmental parameter adjustment devices to adjust the environmental parameters of the tobacco leaf microenvironment.

[0097] This scheme selects some target tobacco boxes, collects the measured temperature data and microenvironment data of the target tobacco boxes in real time during the tobacco microenvironment maintenance process, and reconstructs the temperature field of the entire microenvironment based on the basic information of tobacco microenvironment maintenance; it is convenient to grasp the temperature of the surface of all tobacco boxes and the tobacco box core in the tobacco stack, and formulate the environmental parameter control strategy of the microenvironment according to the temperature field to ensure the accuracy of the temperature of the tobacco aging process.

[0098] Embodiment 2: This embodiment provides an environmental parameter control system for tobacco leaf microenvironment maintenance, such as Figure 2 As shown, a method for controlling environmental parameters of a tobacco leaf microenvironment maintenance is implemented in Example 1; the system includes:

[0099] The screening module is used to obtain basic information on the maintenance of tobacco leaf microenvironment and determine the target tobacco leaf box within the microenvironment;

[0100] The acquisition module is used to collect the microenvironment temperature and the box core temperature of the target tobacco box in real time during the process of tobacco leaf microenvironment maintenance; and to pre-process the microenvironment temperature and the box core temperature;

[0101] A temperature reconstruction module is used to reconstruct the microenvironment temperature field based on the preprocessed microenvironment temperature and the box core temperature;

[0102] The adjustment module is used to adjust the environmental parameters of the microenvironment according to the microenvironment temperature field.

[0103] Embodiment 3: This embodiment provides a computer-readable medium on which a computer program is stored. The computer program is executed by a processor to implement an environmental parameter control method for microenvironment maintenance of tobacco leaves as described in Embodiment 1, specifically comprising the steps of:

[0104] Step 1: Obtain basic information on tobacco leaf microenvironment maintenance and determine the target tobacco leaf box within the microenvironment;

[0105] Step 2: During the process of tobacco leaf microenvironment maintenance, the microenvironment temperature and the box core temperature of the target tobacco leaf box are collected in real time; and the microenvironment temperature and the box core temperature are pre-processed;

[0106] Step 3, reconstructing the microenvironment temperature field based on the pre-processed microenvironment temperature and the box core temperature;

[0107] Step 4: adjusting the environmental parameters of the microenvironment according to the microenvironment temperature field.

[0108] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for controlling environmental parameters of tobacco leaf microenvironment maintenance, characterized in that: include: Obtain basic information on tobacco leaf microenvironment maintenance and determine the target tobacco leaf box within the microenvironment; During the process of tobacco leaf microenvironment maintenance, the microenvironment temperature and the box core temperature of the target tobacco box are collected in real time; And pre-process the micro-environment temperature and box core temperature; Reconstruct the microenvironment temperature field based on the pre-processed microenvironment temperature and the box core temperature; The environmental parameters of the microenvironment are adjusted according to the microenvironment temperature field.

2. The method for controlling environmental parameters of tobacco leaf microenvironment maintenance according to claim 1, characterized in that: The basic information of tobacco leaf microenvironment maintenance is obtained, and the target tobacco leaf box in the microenvironment is determined; Included methods: Obtain tobacco box information and tobacco leaf information in the microenvironment; The tobacco box information includes: tobacco box size, tobacco box quantity s, and tobacco stack size; the tobacco leaf information includes: tobacco leaf variety, tobacco leaf grade d, and tobacco leaf sealing time t; Calculating a tobacco leaf temperature factor R based on the tobacco box information and tobacco leaf information; Where V represents the volume of the chimney; Z max Indicates the largest value among the tobacco box dimensions; Z min Indicates the smallest value among the tobacco box dimensions; Z med Indicates the middle value among the tobacco box dimensions; M C represents the specific heat capacity of tobacco variety C; The number and location of target tobacco boxes are determined based on the tobacco temperature factor R.

3. The method for controlling environmental parameters of tobacco leaf microenvironment maintenance according to claim 2, characterized in that: The method of determining the number and position of target tobacco boxes according to the tobacco temperature factor R includes: A first threshold range and a second threshold range are preset. If the tobacco temperature factor R is within the first threshold range, the number of target tobacco boxes is determined to be a; if the tobacco temperature factor R is within the second threshold range, the number of target tobacco boxes is determined to be b; wherein the first threshold range>the second threshold range, and a>b, b≥n, and n is the minimum number of target tobacco boxes; Get the size of the stack and construct the largest cube of the stack; The diagonal line of the largest cube, the line connecting the centers of opposite faces, the line connecting the diagonals of the bottom face, and the line connecting the midpoints of the sides of the bottom face are used as the target lines; A or b tobacco boxes are determined on the target line as target tobacco boxes. The rules for determining the target tobacco boxes include: The distances between the target tobacco boxes located on the body diagonal are equal; the distances between the target tobacco boxes located on the line connecting the face centers are equal; the distances between the target tobacco boxes on the line connecting the bottom diagonal are equal; The total number of target tobacco boxes located on the body diagonal line ≥ the total number of target tobacco boxes located on the line connecting the face centers; The total number of target tobacco boxes located on the body diagonal line ≥ the total number of target tobacco boxes located on the line connecting the face centers; The total number of target tobacco boxes on the line connecting the bottom diagonals is ≥ the total number of target tobacco boxes on the line connecting the midpoints of the bottom edges.

4. The method for controlling environmental parameters of tobacco leaf microenvironment maintenance according to claim 3, characterized in that: The target tobacco box determination rule also includes: tobacco boxes on other surfaces of the largest cube except the bottom surface are not determined as target tobacco boxes.

5. The method for controlling environmental parameters of tobacco leaf microenvironment maintenance according to claim 1, characterized in that: In the process of maintaining the tobacco leaf microenvironment, the microenvironment temperature and the box core temperature of the target tobacco leaf box are collected in real time; and the microenvironment temperature and the box core temperature are preprocessed; Included methods: Multiple temperature collectors are evenly arranged on the surface of the tobacco stack to collect the temperature of the tobacco stack; temperature collectors are arranged in the target tobacco box to collect the box core temperature; A first temperature threshold range is preset, and when the temperatures of the cigarette stacks are all within the first temperature threshold range, an average value of the temperatures of the cigarette stacks is calculated as the micro-environment temperature; A second temperature threshold range is preset to determine whether the temperature of each box core is within the second temperature threshold range. If so, the preprocessing is completed; otherwise, an abnormal box core temperature alarm is issued.

6. The method for controlling environmental parameters of tobacco leaf microenvironment maintenance according to claim 4, characterized in that: The microenvironment temperature field is reconstructed based on the pre-processed microenvironment temperature and the box core temperature, including the following method: The microenvironment is trained and learned, and an overcomplete dictionary D is analyzed based on the prior information F; where F = DX; X represents the sparse coding of the temperature field of the prior information F; Obtain the temperature inside the microenvironment and the temperature of the box core, and construct initial measured data; Calculate the temperature field sparse code X based on the initial measured data and the over-complete dictionary D; The microenvironment temperature field is restored according to the temperature field sparse coding X.

7. The method for controlling environmental parameters of tobacco leaf microenvironment maintenance according to claim 6, characterized in that: The method of obtaining the temperature in the microenvironment and the box core temperature and constructing initial measured data includes: Obtain the temperature inside the microenvironment and the temperature of the box core; Initialize a random Gaussian matrix Φ with is the objective function, and the objective function f is minimized iteratively to obtain the observation matrix Φ; E represents the error matrix; represents the square of the F norm; Taking the temperature in the microenvironment and the box core temperature as observation vectors and the overcomplete dictionary D as the transformation basis, the greedy pursuit algorithm is used to solve the box core temperatures of all tobacco leaves in the largest cube. The temperatures of all tobacco box cores within the largest cube are taken as initial measured data.

8. The method for controlling environmental parameters of tobacco leaf microenvironment maintenance according to claim 1, characterized in that: The method of adjusting the environmental parameters of the microenvironment according to the microenvironment temperature field includes: The microenvironment is evenly divided into multiple cubes of equal size; each cube contains at least n tobacco boxes, n≥4; Cubes with excessive temperatures are screened out based on the temperature field of the microenvironment; Determine the position of the current cube: if at least one surface of the current cube belongs to the surface of the microenvironment, turn on the environmental parameter adjustment device closest to the current cube to adjust the environmental parameters of the tobacco leaf microenvironment; if all surfaces of the current cube do not belong to the surface of the microenvironment, turn on all environmental parameter adjustment devices to adjust the environmental parameters of the tobacco leaf microenvironment.

9. An environmental parameter control system for tobacco leaf microenvironment maintenance, characterized in that: A method for controlling environmental parameters for microenvironmental maintenance of tobacco leaves according to any one of claims 1 to 8; the system comprising: The screening module is used to obtain basic information on the maintenance of tobacco leaf microenvironment and determine the target tobacco leaf box within the microenvironment; The acquisition module is used to collect the microenvironment temperature and the box core temperature of the target tobacco box in real time during the process of tobacco leaf microenvironment maintenance; and pre-process the microenvironment temperature and the box core temperature; A temperature reconstruction module is used to reconstruct the microenvironment temperature field based on the preprocessed microenvironment temperature and the box core temperature; The adjustment module is used to adjust the environmental parameters of the microenvironment according to the microenvironment temperature field.

10. A computer readable medium having a computer program stored thereon, characterized in that: The computer program is executed by a processor to implement an environmental parameter control method for tobacco leaf microenvironment maintenance as described in any one of claims 1-8.

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