CN110893001B - Method and system for controlling water content of outlet of loosening and dampening process - Google Patents

Method and system for controlling water content of outlet of loosening and dampening process Download PDF

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CN110893001B
CN110893001B CN201911272662.3A CN201911272662A CN110893001B CN 110893001 B CN110893001 B CN 110893001B CN 201911272662 A CN201911272662 A CN 201911272662A CN 110893001 B CN110893001 B CN 110893001B
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outlet
water content
loosening
ewma
control model
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CN110893001A (en
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靳毅
李文伟
陈霞
刘玉叶
郑乾光
王海宇
段李华
王慧娟
马宁
王慧
于光伟
李超
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China Tobacco Henan Industrial Co Ltd
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Henan Center Line Electronic Technology Co ltd
China Tobacco Henan Industrial Co Ltd
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    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B3/00—Preparing tobacco in the factory
    • A24B3/04—Humidifying or drying tobacco bunches or cut tobacco
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B3/00—Preparing tobacco in the factory
    • A24B3/06—Loosening tobacco leaves or cut tobacco
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B9/00—Control of the moisture content of tobacco products, e.g. cigars, cigarettes, pipe tobacco

Abstract

The invention provides a method and a system for controlling the water content of an outlet in a loosening and dampening process, wherein the method comprises the following steps: setting the inlet water content and the water adding amount of the loosening and conditioning machine according to a set value, and setting a target value of the outlet water content of the loosening and conditioning process; acquiring measured values of the outlet water content of the loosening and conditioning process, and acquiring target deviation values of the outlet water content according to the target values and the measured values; and establishing a PID feedback control model for regulating the flow of the tobacco flakes according to the target deviation value so as to perform feedback control on the outlet moisture content, so that the outlet moisture content of the loosening and dampening process in the batch is controlled according to the target value. The invention can improve the consistency of loosening and moisture regaining uniformity of each batch and improve the quality control capability of the production process.

Description

Method and system for controlling water content of outlet of loosening and dampening process
Technical Field
The invention relates to the technical field of tobacco processing, in particular to a method and a system for controlling the water content of an outlet in a loosening and moisture regaining process.
Background
The loosening and moisture regaining are used as important processing procedures of a tobacco processing line of a tobacco factory to influence the quality of tobacco shreds, the moisture content of a loosening and moisture regaining outlet is an important technological index of the procedures, and the process stability has direct influence on the technological indexes of the subsequent procedures. At present, a plurality of problems exist in outlet moisture control in the loosening and dampening process, and the most prominent problems are that: firstly, the loosening and conditioning control system cannot adjust the water adding amount according to the outlet water content obtained by real-time measurement, so that the stability of the outlet water content is influenced. Secondly, because the water absorption capacity of the tobacco flakes on the tobacco shred production line is constantly changed, the moisture content of the tobacco flake outlets in the same batch or different batches is different, and the stability of the moisture content of the tobacco flakes is influenced, so that more unqualified tobacco shreds are produced, and the process indexes of the subsequent processes are greatly influenced.
Disclosure of Invention
The invention provides a method and a system for controlling the water content of an outlet of a loosening and dampening procedure, which solve the problems of inaccurate and uneven control of the water content of the outlet of the existing loosening and dampening procedure, can improve the consistency of the water content of the outlet of each batch of loosening and dampening and improve the quality control capability of the production process.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method for controlling the water content of an outlet of a loosening and moisture regaining process comprises the following steps:
setting the inlet water content and the water adding amount of the loosening and dampening according to a set value, and setting a target value of the outlet water content of the loosening and dampening procedure;
acquiring measured values of the outlet water content of the loosening and conditioning process, and acquiring target deviation values of the outlet water content according to the target values and the measured values;
and establishing a PID feedback control model for regulating the flow of the tobacco flakes according to the target deviation value so as to perform feedback control on the outlet moisture content, so that the outlet moisture content of the loosening and dampening process in the batch is controlled according to the target value.
Preferably, the method further comprises the following steps:
acquiring the outlet water content and the tobacco flake flow in the loosening and dampening process within set time in real time, and fitting according to the time relationship to obtain a regression fitting function of the outlet water content and the tobacco flake flow;
and establishing a double-layer EWMA control model of the tobacco flake flow and the outlet water content according to the regression fitting function so as to establish a consistency control model of the outlet water content of the loosening and dampening process among different batches.
Preferably, the method further comprises the following steps:
taking the tobacco flake flow as the control input of a double-layer EWMA control model, and taking the water content of an outlet as the control output of the double-layer EWMA control model;
obtaining an intercept term and a gain function coefficient of a double-layer EWMA control model of the water content of the outlet and the tobacco flake flow according to the regression fitting function;
and controlling the flow of the tobacco flakes by adjusting the smoothing coefficient of the double-layer EWMA control model according to the preset target value of the outlet water content, so that the outlet water content among different batches is kept consistent.
Preferably, the method further comprises the following steps:
collecting the value of the water content of the outlet of each batch, and calculating the mean square error of the batch after each batch is finished;
and if the mean square error of two continuous batches is continuously increased, adjusting the smoothing coefficient in the double-layer EWMA control model.
Preferably, constructing the two-layer EWMA control model includes:
the EWMA control process is described in the following model:
yt＝α+fβ(ut-1)+εt，
wherein, ytFor the process output at time t, α represents the intercept term of the EWMA control model, fβ(ut-1) Is a gain function of the control input and output with a coefficient beta, ut-1For the control input of the control system at time point t-1, epsilontIs a process disturbance;
every time t, the EWMA control model updates the intercept term through a simple EWMA filter: alpha is alphat＝λ(yt-fb(ut-1))+(1-λ)αt-1Wherein, ytIs the actual value of the process output at the time point t, lambda is the EWMA prediction weight, lambda is more than or equal to 0 and less than or equal to 1, b is the estimated value of beta in the process model, fb(ut-1) The process control model is obtained by a regression analysis method;
adding a trend term d in a linear model of a production processtThe following can be obtained: y ist＝αt-1+fβ(ut-1)+dt+εt；
After the intercept term and the trend term are estimated by applying an EWMA algorithm, the following results can be obtained:
Figure GDA0003352631130000031
wherein λ is1，λ2Is EWMA smoothing coefficient, 0 is more than or equal to lambda1，λ2≤1；
Thus, a double-layer EWMA control model is constructed, and the control input at the time t is calculated by the following formula:
Figure GDA0003352631130000032
preferably, the establishing of the double-layer EWMA control model of the tobacco flake flow and the outlet water content according to the regression fitting function includes:
obtaining an intercept term alpha and a gain function coefficient of a double-layer EWMA control model of the water content of the outlet and the tobacco flake flow according to the regression fitting function;
determining and estimating an intercept term alpha of each moment according to the sample values of the flow rate of the tobacco flakes and the water content of the outlet acquired in real timetAnd a trend term dt；
Establishing a mathematical expression model of the tobacco flake flow and the outlet water content: tobacco flake flow ut＝(yT-αt-dt) Coefficient of gain function, where yTThe target value of the outlet water content is constant.
The invention also provides a system for controlling the water content of the outlet of the loosening and dampening process, which comprises the following steps:
the first setting unit is used for setting the hot air temperature and the circulating air quantity of the loosening and conditioning machine according to set values and setting a target value of the outlet water content of the loosening and conditioning process;
the acquisition unit is used for acquiring measured values of the outlet water content of the loosening and dampening process and acquiring target deviation values of the outlet water content according to the target values and the measured values;
and the PID control unit is used for establishing a PID feedback control model and is used for adjusting the flow of the tobacco flakes according to the target deviation value so as to perform feedback control on the moisture content of the outlet, so that the moisture content of the outlet of the loosening and dampening process in the batch is controlled according to the target value.
Preferably, the method further comprises the following steps:
the fitting unit is used for acquiring the outlet water content and the tobacco flake flow in the loosening and moisture regaining process within set time in real time, and fitting according to the time relationship to obtain a regression fitting function of the outlet water content and the tobacco flake flow;
and the EWMA control unit is used for establishing a double-layer EWMA control model of the tobacco flake flow and the outlet water content according to the regression fitting function so as to establish a consistency control model of the outlet water content of the loosening and dampening process among different batches.
Preferably, the method further comprises the following steps:
the second setting unit is used for taking the tobacco flake flow as the control input of the double-layer EWMA control model and taking the water content of the outlet as the control output of the double-layer EWMA control model;
the obtaining unit is used for obtaining an intercept term and a gain function coefficient of the double-layer EWMA control model of the water content of the outlet and the tobacco flake flow according to the regression fitting function;
and the adjusting unit is used for controlling the flow of the tobacco flakes by adjusting the smoothing coefficient of the double-layer EWMA control model according to the preset target value of the outlet water content, so that the outlet water content among different batches is kept consistent.
Preferably, the method further comprises the following steps:
the mean square error calculation unit is used for collecting the value of the water content of the outlet of each batch and calculating the mean square error of the batch after each batch is finished;
and the correcting unit is used for adjusting the smoothing coefficient in the double-layer EWMA control model if the mean square errors of two continuous batches are continuously increased.
The invention provides a method and a system for controlling the moisture content of an outlet of a loosening and moisture regaining process, wherein the moisture content of the outlet is controlled by adjusting the flow of tobacco flakes by setting a PID feedback control model in the same batch, so that the problems of inaccurate and uneven control of the moisture content of the outlet of the existing loosening and moisture regaining process are solved, the consistency of the loosening and moisture regaining uniformity of each batch can be improved, and the quality control capability of the production process is improved.
Drawings
In order to more clearly describe the specific embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below.
FIGS. 1 and 2 are schematic views illustrating a method for controlling moisture content at an outlet of a loosening and conditioning process according to the present invention;
FIG. 3 is a schematic diagram of the structure for controlling the moisture content at the outlet of the loosening and conditioning process according to the present invention;
FIG. 4 is a schematic diagram of the structure of controlling the moisture content at the outlet of another loosening and conditioning process provided by the present invention.
Detailed Description
In order to make the technical field of the invention better understand the scheme of the embodiment of the invention, the embodiment of the invention is further described in detail with reference to the drawings and the implementation mode.
Aiming at the problems that the accuracy and the uniformity of feed liquid spraying in the current loosening and moisture regaining process are not accurate, the quality of tobacco leaves in batches or between batches is not consistent, and the quality of the tobacco is affected, the invention provides a method and a system for controlling the moisture content of an outlet of the loosening and moisture regaining process.
As shown in fig. 1, a method for controlling the moisture content of the outlet of a loosening and dampening process includes:
s1: setting the inlet water content and the water adding amount of the loosening and dampening according to a set value, and setting a target value of the outlet water content of the loosening and dampening procedure;
s2: acquiring measured values of the outlet water content of the loosening and conditioning process, and acquiring target deviation values of the outlet water content according to the target values and the measured values;
s3: and establishing a PID feedback control model for regulating the flow of the tobacco flakes according to the target deviation value so as to perform feedback control on the outlet moisture content, so that the outlet moisture content of the loosening and dampening process in the batch is controlled according to the target value.
Specifically, in the production process of the loosening and conditioning process, the moisture content of the outlet can be influenced and controlled through the aspects of the water content of the inlet, the moisture content of the target outlet, the water adding amount, the flow rate of the tobacco flakes and the like. In order to avoid instability of the production process caused by simultaneous action of a plurality of influence factors, a plurality of influence variables can be respectively fixed at a proper value, and only one influence factor is adjusted to control the water content of the outlet. The method realizes the adjustment of the water content of the outlet by setting the water content of the inlet and the water adding amount at fixed values and adjusting the flow of the tobacco flakes. As shown in fig. 3, the outlet moisture content is adjusted in real time through the PID feedback control model, the measured value of the outlet moisture content is compared with the target value, then the target deviation value is used as the input of the PID feedback control model, and adaptive learning is performed according to the input tobacco flake flow, so that the parameter values of P, I and D are determined and adjusted, the control of the outlet moisture content is realized, the stability of the control of the outlet moisture content in batches is improved, and the consistency of the control between batches is increased.
The method further comprises the following steps:
s4: acquiring the outlet water content and the tobacco flake flow in the loosening and dampening process within set time in real time, and fitting according to the time relationship to obtain a regression fitting function of the outlet water content and the tobacco flake flow;
s5: and establishing a double-layer EWMA control model of the tobacco flake flow and the outlet water content according to the regression fitting function so as to establish a consistency control model of the outlet water content of the loosening and dampening process among different batches.
Specifically, the inputs (i.e., control parameters) and outputs (control results) of the control process are first determined before regression analysis is performed to model the loosely regained control process. The current control mode can be that the influence parameters such as the temperature of the cylinder wall, the temperature of hot air, the moisture-removing negative pressure and the like are kept fixed, and the feedback control of the water content of the outlet is realized by adjusting the flow of the tobacco flakes. If the moisture content of the outlet is higher, the flow rate of the tobacco flakes is increased to reduce the moisture content of the outlet, and if the moisture content of the outlet is lower, the flow rate of the tobacco flakes is reduced to increase the moisture content of the outlet. The control of the tobacco flake flow is mainly automatically completed through a PID feedback control model, and an operator can manually adjust the tobacco flake flow according to actual conditions. Therefore, the input of the control process is the flow of the tobacco flakes, and the output is the water content of the outlet. Further, a double-layer Exponential Weighted Moving Average (EWMA) method is adopted to establish a quality consistency control model of the outlet water content, and a self-adaptive algorithm is adopted to automatically optimize and correct the model so as to control the consistency of the outlet water content of the loosening and dampening process among different batches.
Further, constructing a two-tier EWMA control model comprises:
assume that the EWMA control process can be described in the following model:
yt＝α+fβ(ut-1)+εt，
wherein, ytFor the process output at time t, α represents the intercept term of the EWMA control model, fβ() Is a gain function of the control input and output with a coefficient beta, ut-1For the control input of the control system at time point t-1, epsilontIs a process disturbance;
every time t, the EWMA control model updates the intercept term through a simple EWMA filter: alpha is alphat＝λ(yt-fb(ut-1))+(1-λ)αt-1Wherein, ytIs the actual value of the process output at the time point t, lambda is the EWMA prediction weight, lambda is more than or equal to 0 and less than or equal to 1, b is the estimated value of beta in the process model, fb() Can be obtained by a method of regression analysis of the process control model;
adding a trend term d in a linear model of a production processtThe following can be obtained: y ist＝αt-1+fβ(ut-1)+dt+εt；
After the intercept term and the trend term are estimated by applying an EWMA algorithm, the following results can be obtained:
Figure GDA0003352631130000071
wherein λ is1，λ2Is EWMA smoothing coefficient, 0 is more than or equal to lambda1，λ2≤1；
Thus, a double-layer EWMA control model is constructed, and the control input at the time t can be calculated by the following formula:
Figure GDA0003352631130000072
as shown in fig. 2, the method further includes:
s6: taking the tobacco flake flow as the control input of a double-layer EWMA control model, and taking the water content of an outlet as the control output of the double-layer EWMA control model;
s7: obtaining an intercept term and a gain function coefficient of a double-layer EWMA control model of the water content of the outlet and the tobacco flake flow according to the regression fitting function;
s8: and controlling the flow of the tobacco flakes by adjusting the smoothing coefficient of the double-layer EWMA control model according to the preset target value of the outlet water content, so that the outlet water content among different batches is kept consistent.
Specifically, as shown in fig. 4, the moisture content of the outlet is controlled by a double-layer EWMA control model between batches, and the moisture content of the outlet is controlled by a PID feedback control model in a batch, so that the control level of the production process of the process can be effectively improved, and the consistency of the moisture content of the outlet of the cut tobacco drying process between different batches can be controlled.
The method further comprises the following steps:
s9: collecting the value of the water content of the outlet of each batch, and calculating the mean square error of the batch after each batch is finished;
s10: and if the mean square error of two continuous batches is continuously increased, adjusting the smoothing coefficient in the double-layer EWMA control model.
Specifically, in the process of controlling by applying the double-layer EWMA control model, after each batch is finished, the quality consistency of the batch is analyzed. There are many evaluation methods for batch quality, and a simpler and common evaluation method is adopted to calculate the Mean Square Error (MSE):
Figure GDA0003352631130000081
wherein n is the number of samples obtained in each batch, yiAnd taking the value of the water content of the outlet in each sample.
In practical applications, we expect that a smaller MSE is better, and a smaller MSE indicates a more stable process quality. If the MSE of two consecutive batches is increased, it indicates that a new change occurs in the production process, which causes the current control mode to be not adapted to the actual production, and therefore, the current control mode needs to be adjusted. In the double-layer EWMA control model, an adjustment method that is relatively easy to implement is to adjust the smoothing coefficient λ. In fact, from the viewpoint of signal processing, the EWMA can be regarded as a low-pass filter, and by controlling the value of λ, a smooth form of the signal is provided for eliminating short-term fluctuations and preserving the long-term development tendency, so that from the long-term viewpoint, it is better to take a smaller value of λ (usually, λ ═ 0.20 is desirable). But the lambda value also determines the ability of the EWMA controller to track process changes, i.e., the effectiveness, and it is obvious that the larger the lambda value, the more effective the controller is, and vice versa. When the MSE of two consecutive batches increases, the value of λ may be modified to increase the value of λ from 0.20 to 0.40, and if the MSE of the next batch still increases, the value of λ may be increased from 0.40 to 0.60. However, in order to obtain a good long-term process trend, the lambda value should not be too large, so when the lambda value reaches 0.60 and needs to be adjusted, the latest 3 to 5 batches of data are needed to perform regression fitting again according to the methods in 2.2 and 2.3, and a new control model is established.
Further, according to the regression fitting function, establish the double-layer EWMA control model of smoked sheet flow and export moisture content, including:
obtaining an intercept term alpha and a gain function coefficient of a double-layer EWMA control model of the water content of the outlet and the tobacco flake flow according to the regression fitting function;
determining and estimating an intercept term alpha of each moment according to the sample values of the flow rate of the tobacco flakes and the water content of the outlet acquired in real timetAnd a trend term dt；
Establishing a mathematical expression model of the tobacco flake flow and the outlet water content: tobacco flake flow ut＝(yT-αt-dt) Coefficient of gain function, where yTThe target value of the outlet water content is constant.
Therefore, on the basis of automatic feedback control of the water content of the loose moisture regain outlet, a process quality consistency control model is constructed by adopting a double-layer EWMA method, and a self-adaptive algorithm is designed to optimize and correct parameters of the control model. The result comparison verification shows that: the control effect is obviously improved after improvement, the average offset, the process range and the mean square error of the process mean value and the control target are respectively reduced by 29 percent, 2 percent and 32 percent, the process capability index is improved by 18 percent, and the batch consistency of the outlet moisture content of the loose moisture regaining and the quality control capability of the production process are effectively improved. The method for online intelligent control and optimization adjustment can also be popularized and applied to other similar silk production processes.
The invention provides a method for controlling the moisture content of an outlet in a loosening and conditioning process, wherein the moisture content of the outlet is controlled by adjusting the flow of tobacco flakes through setting a PID feedback control model in the same batch, and the moisture content of the outlet is controlled in a consistent manner by adopting a double-layer EWMA control model in different batches. The problem of inaccurate and inhomogeneous control of the export moisture content of current loose moisture regain process is solved, can improve the uniformity of each batch loose moisture regain degree of consistency, promote production process quality control ability.
Correspondingly, the invention also provides a control system for the water content of the outlet of the loosening and moisture regaining process, which comprises the following steps: the first setting unit is used for setting the hot air temperature and the circulating air quantity of the loosening and conditioning machine according to set values and setting a target value of the outlet water content of the loosening and conditioning process. And the acquisition unit is used for acquiring the measured value of the outlet water content of the loosening and dampening process and obtaining a target deviation value of the outlet water content according to the target value and the measured value. And the PID control unit is used for establishing a PID feedback control model and is used for adjusting the flow of the tobacco flakes according to the target deviation value so as to perform feedback control on the moisture content of the outlet, so that the moisture content of the outlet of the loosening and dampening process in the batch is controlled according to the target value.
The system further comprises: and the fitting unit is used for acquiring the outlet water content and the tobacco flake flow in the loosening and moisture regaining process within set time in real time, and fitting according to the time relationship to obtain a regression fitting function of the outlet water content and the tobacco flake flow. And the EWMA control unit is used for establishing a double-layer EWMA control model of the tobacco flake flow and the outlet water content according to the regression fitting function so as to establish a consistency control model of the outlet water content of the loosening and dampening process among different batches.
The system further comprises: and the second setting unit is used for inputting the control of the smoked sheet flow as a double-layer EWMA control model and outputting the control of the outlet water content as the double-layer EWMA control model. And the obtaining unit is used for obtaining an intercept term and a gain function coefficient of the double-layer EWMA control model of the water content of the outlet and the tobacco flake flow according to the regression fitting function. And the adjusting unit is used for controlling the flow of the tobacco flakes by adjusting the smoothing coefficient of the double-layer EWMA control model according to the preset target value of the outlet water content, so that the outlet water content among different batches is kept consistent.
The system further comprises: and the mean square error calculation unit is used for acquiring the value of the water content of the outlet of each batch and calculating the mean square error of the batch after each batch is finished. And the correcting unit is used for adjusting the smoothing coefficient in the double-layer EWMA control model if the mean square errors of two continuous batches are continuously increased.
Therefore, the invention provides a system for controlling the water content of an outlet in a loosening and moisture regaining process, wherein the water content of the outlet is controlled by adjusting the flow of tobacco flakes by setting a PID feedback control model in the same batch, and the water content of the outlet is controlled in a consistent manner by adopting a double-layer EWMA control model in different batches. The method solves the problems of inaccurate and uneven control of the water content of the outlet of the loosening and dampening process, can improve the consistency of loosening and dampening uniformity of each batch, and improves the quality control capability of the production process.
The construction, features and functions of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the present invention is not limited to the embodiments shown in the drawings, and all equivalent embodiments modified or modified by the spirit and scope of the present invention should be protected without departing from the spirit of the present invention.

Claims (8)

1. A method for controlling the water content of an outlet in a loosening and moisture regaining process is characterized by comprising the following steps:
setting the inlet water content and the water adding amount of the loosening and dampening according to a set value, and setting a target value of the outlet water content of the loosening and dampening procedure;
acquiring measured values of the outlet water content of the loosening and conditioning process, and acquiring target deviation values of the outlet water content according to the target values and the measured values;
establishing a PID feedback control model for regulating the flow of the tobacco flakes according to the target deviation value so as to perform feedback control on the outlet moisture content, so that the outlet moisture content of the loosening and dampening process in the batch is controlled according to the target value;
acquiring the outlet water content and the tobacco flake flow in the loosening and dampening process within set time in real time, and fitting according to the time relationship to obtain a regression fitting function of the outlet water content and the tobacco flake flow;
and establishing a double-layer EWMA control model of the tobacco flake flow and the outlet water content according to the regression fitting function so as to establish a consistency control model of the outlet water content of the loosening and dampening process among different batches.
2. The method for controlling moisture content at an outlet of a loosening and conditioning process according to claim 1, further comprising:
taking the tobacco flake flow as the control input of a double-layer EWMA control model, and taking the water content of an outlet as the control output of the double-layer EWMA control model;
obtaining an intercept term and a gain function coefficient of a double-layer EWMA control model of the water content of the outlet and the tobacco flake flow according to the regression fitting function;
and controlling the flow of the tobacco flakes by adjusting the smoothing coefficient of the double-layer EWMA control model according to the preset target value of the outlet water content, so that the outlet water content among different batches is kept consistent.
3. The method for controlling moisture content at an outlet of a loosening and conditioning process according to claim 2, further comprising:
collecting the value of the water content of the outlet of each batch, and calculating the mean square error of the batch after each batch is finished;
and if the mean square error of two continuous batches is continuously increased, adjusting the smoothing coefficient in the double-layer EWMA control model.
4. The method for controlling the moisture content of the outlet of the loosening and conditioning process as claimed in claim 3, wherein the constructing of the double-layer EWMA control model comprises:
the EWMA control process is described in the following model:
yt＝α+fβ(ut-1)+εt，
wherein, ytFor the process output at time t, α represents the intercept term of the EWMA control model, fβ(ut-1) Is a gain function of the control input and output with a coefficient beta, ut-1For the control input of the control system at time point t-1, epsilontIs a process disturbance;
every time t, the EWMA control model updates the intercept term through a simple EWMA filter: alpha is alphat＝λ(yt-fb(ut-1))+(1-λ)αt-1Wherein, ytIs the actual value of the process output at the time point t, lambda is the EWMA prediction weight, lambda is more than or equal to 0 and less than or equal to 1, b is the estimated value of beta in the process model, fb(ut-1) The process control model is obtained by a regression analysis method;
adding a trend term d in a linear model of a production processtThe following can be obtained: y ist＝αt-1+fβ(ut-1)+dt+εt；
After the intercept term and the trend term are estimated by applying an EWMA algorithm, the following results can be obtained:
Figure FDA0003352631120000021
wherein λ is1，λ2Is EWMA smoothing coefficient, 0 is more than or equal to lambda1，λ2≤1；
Thus, a double-layer EWMA control model is constructed, and the control input at the time t is calculated by the following formula:
Figure FDA0003352631120000022
5. the method for controlling the moisture content of the outlet of the loosening and conditioning process as claimed in claim 4, wherein the establishing of the double-layer EWMA control model of the tobacco flake flow and the outlet moisture content according to the regression fitting function comprises:
obtaining an intercept term alpha and a gain function coefficient of a double-layer EWMA control model of the water content of the outlet and the tobacco flake flow according to the regression fitting function;
determining and estimating an intercept term alpha of each moment according to the sample values of the flow rate of the tobacco flakes and the water content of the outlet acquired in real timetAnd a trend term dt；
Establishing a mathematical expression model of the tobacco flake flow and the outlet water content: tobacco flake flow ut＝(yT-αt-dt) Coefficient of gain function, where yTThe target value of the outlet water content is constant.
6. A control system of the moisture content of an outlet of a loosening and moisture regaining process is characterized by comprising:
the first setting unit is used for setting the hot air temperature and the circulating air quantity of the loosening and conditioning machine according to set values and setting a target value of the outlet water content of the loosening and conditioning process;
the acquisition unit is used for acquiring measured values of the outlet water content of the loosening and dampening process and acquiring target deviation values of the outlet water content according to the target values and the measured values;
the PID control unit is used for establishing a PID feedback control model and is used for adjusting the flow of the tobacco flakes according to the target deviation value so as to perform feedback control on the moisture content of the outlet, so that the moisture content of the outlet of the loosening and dampening process in the batch is controlled according to the target value;
the fitting unit is used for acquiring the outlet water content and the tobacco flake flow in the loosening and moisture regaining process within set time in real time, and fitting according to the time relationship to obtain a regression fitting function of the outlet water content and the tobacco flake flow;
and the EWMA control unit is used for establishing a double-layer EWMA control model of the tobacco flake flow and the outlet water content according to the regression fitting function so as to establish a consistency control model of the outlet water content of the loosening and dampening process among different batches.
7. The system for controlling moisture content at the outlet of a loosening and conditioning process as claimed in claim 6, further comprising:
the second setting unit is used for taking the tobacco flake flow as the control input of the double-layer EWMA control model and taking the water content of the outlet as the control output of the double-layer EWMA control model;
the obtaining unit is used for obtaining an intercept term and a gain function coefficient of the double-layer EWMA control model of the water content of the outlet and the tobacco flake flow according to the regression fitting function;
and the adjusting unit is used for controlling the flow of the tobacco flakes by adjusting the smoothing coefficient of the double-layer EWMA control model according to the preset target value of the outlet water content, so that the outlet water content among different batches is kept consistent.
8. The system for controlling moisture content at the outlet of a loosening and conditioning process according to claim 7, further comprising:
the mean square error calculation unit is used for collecting the value of the water content of the outlet of each batch and calculating the mean square error of the batch after each batch is finished;
and the correcting unit is used for adjusting the smoothing coefficient in the double-layer EWMA control model if the mean square errors of two continuous batches are continuously increased.
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