An electronic shaft gravure press acceleration process fully decoupled register control method and system

Abstract

The application discloses a kind of electronic shaft gravure printing machine acceleration process complete decoupling overprint control method and system, method includes: in electronic shaft gravure printing machine acceleration process, the overprint error of each color group and first color group is obtained;When overprint error is greater than zero, decoupling is carried out based on the first steady speed mathematical model of overprint error and printing plate roller linear velocity variation amount, and second mathematical model is obtained;Second mathematical model is converted into the third mathematical model of linear discrete time system, and then model prediction analysis is carried out to third mathematical model, and fourth mathematical model is obtained;Optimal solution analysis is carried out to fourth mathematical model, and the actual linear velocity control amount of each printing plate roller is obtained, and then the linear velocity of printing plate roller is controlled according to actual linear velocity control amount;Wherein, overprint error includes overprint error value and acceleration disturbance.The application can eliminate printing error in acceleration printing process, improve the response speed and overprint accuracy of system, and can be widely applied in printing control technical field.

Description

Technical Field

[0001] This application relates to the field of printing control technology, and in particular to a method and system for completely decoupled overprint control of the acceleration process of an electronic shaft gravure printing machine. Background Technology

[0002] In the printing process of an electronic shaft gravure printing machine, the complex pattern to be printed is broken down into several simple patterns, which are engraved on the printing rollers respectively. During printing, the substrate passes through the feeding section sequentially through each printing roller, and each printing roller prints the corresponding simple pattern onto the substrate, ultimately resulting in the complex printed pattern. After the electronic shaft gravure printing machine starts, it must go through pre-registration, low-speed registration, and acceleration stages before entering normal printing. Only after the acceleration process is completed does the system truly enter the normal high-speed printing stage, demonstrating the importance of the acceleration process. However, during accelerated printing, color registration errors can occur between units, thus reducing the quality of the printed product. Existing color registration control methods for the accelerated printing process are limited, and they suffer from slow response speed and low color registration accuracy. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the purpose of this invention is to provide a method and system for completely decoupled overprinting control of the acceleration process of an electronic shaft gravure printing machine with fast response speed and high color registration accuracy.

[0004] To achieve the above objectives, one aspect of this application proposes a method for completely decoupled overprint control of the acceleration process in an electronic shaft gravure printing machine, comprising the following steps: During the acceleration process of the electronic shaft gravure printing machine, the registration error between each color group and the first color group is obtained; When the color registration error is greater than zero, the first steady-speed mathematical model based on the color registration error and the change in the linear speed of the printing plate roller is decoupled to obtain the second mathematical model. The second mathematical model is transformed into a third mathematical model of a linear discrete-time system, and then model prediction analysis is performed on the third mathematical model to obtain a fourth mathematical model. The optimal solution analysis is performed on the fourth mathematical model to obtain the actual linear speed control amount of each printing roller, and then the linear speed of the printing roller is controlled according to the actual linear speed control amount. The color registration error includes the color registration error value and the acceleration disturbance.

[0005] In some embodiments, the first steady-speed mathematical model for the color registration error and the change in the linear speed of the printing plate roller is:

[0006] in, , , i, j, and k are positive integers and s represents the complex variable after the Laplace transform. This represents the color registration error between the i-th color group and the first color group. This represents the change in linear velocity of the i-th printing roller. Let represent the first influence function of the change in the linear velocity of the i-th printing roller on the registration error between the i-th color group and the first color group. The second influence function represents the effect of the change in the linear velocity of the preceding printing roller on the registration error between the i-th color group and the first color group. This indicates the synchronous linear speed of the electronic shaft gravure printing machine. This represents the material feeding length between the i-th printing roller and the (i+1)-th printing roller. , as well as It is a variable and is related to the actual operating parameters of the electronic shaft gravure printing machine.

[0007] In some embodiments, by rewrite And then through express The second mathematical model is:

[0008]

[0009] in, This represents the expression for the color matching error vector between the second to the i-th color groups and the first color group. This represents the effect function after decoupling. This represents the vector expression for the linear velocity control quantity of the second to the i-th printing rollers.

[0010] In some embodiments, the third mathematical model is:

[0011]

[0012] in, This represents the expression for the color matching error vector between the second to the i-th color groups and the first color group. Indicates the increment of color registration error. This represents the linear velocity control increment, where A and B are coefficient matrices and C is the identity matrix.

[0013] In some embodiments, the fourth mathematical model is:

[0014]

[0015]

[0016]

[0017] Where i and j are positive integers and p represents the preset p-step prediction time domain, and m represents the preset m-step control time domain. (k+1|k) represents the prediction of time k+1 from the current time k. Describes the (i-1)-dimensional identity matrix. and It is a coefficient matrix.

[0018] In some embodiments, the step of performing optimal solution analysis on the fourth mathematical model to obtain the actual linear speed control value of each printing roller specifically includes: Design a first objective function, then solve the first objective function, and introduce a preset auxiliary variable to obtain the extreme value solution of the first objective function; The extreme value solution is decoupled to obtain the actual linear velocity control value of each printing roller.

[0019] In some embodiments, the actual linear velocity control amount is determined by the following formula:

[0020] in, This represents the optimal solution expression of the fourth mathematical model. Describes the (i-1)-dimensional identity matrix. Represents a p×1 dimensional block matrix. and The coefficient matrix, This represents the preset error weight matrix for each color group in the prediction time domain. This represents the preset control weight matrix for each color group in the control time domain. This represents the vector expression for the linear velocity control quantity of the second to the i-th printing rollers, obtained according to the second mathematical model. This represents the expression for the color matching error vector between the second to the i-th color groups and the first color group. Indicates the increment of color registration error. denoted by , where represents the actual linear velocity control quantity, and D represents the relation matrix for restoring the decoupled control quantity to the control quantity before decoupling.

[0021] To achieve the above objectives, another aspect of this application proposes a fully decoupled overprint control system for the acceleration process of an electronic shaft gravure printing machine, comprising: The color registration error acquisition module is used to acquire the color registration error between each color group and the first color group during the acceleration process of the electronic shaft gravure printing machine. The model decoupling module is used to decouple the first steady-speed mathematical model based on the color registration error and the change in the linear speed of the printing plate roller when the color registration error is greater than zero, so as to obtain the second mathematical model. The model prediction module is used to transform the second mathematical model into a third mathematical model of a linear discrete-time system, and then perform model prediction analysis on the third mathematical model to obtain a fourth mathematical model. The linear speed control module is used to perform optimal solution analysis on the fourth mathematical model to obtain the actual linear speed control amount of each printing plate roller, and then control the linear speed of the printing plate roller according to the actual linear speed control amount. The color registration error includes the color registration error value and the acceleration disturbance.

[0022] To achieve the above objectives, another aspect of the embodiments of this application proposes an electronic device, which includes a memory, a processor, a program stored in the memory and executable on the processor, and a data bus for enabling communication between the processor and the memory. When the program is executed by the processor, it implements the fully decoupled overprint control method for accelerating the electronic shaft gravure printing machine as described above.

[0023] To achieve the above objectives, another aspect of the embodiments of this application proposes a storage medium, which is a computer-readable storage medium for computer-readable storage. The storage medium stores one or more programs that can be executed by one or more processors to implement the fully decoupled overprint control method for the accelerated process of the electronic shaft gravure printing machine as described above.

[0024] The beneficial effects of this invention are as follows: The electronic shaft gravure printing press acceleration process of this invention is completely decoupled from the registration control method and system. Based on the decoupling of the first steady-speed mathematical model between registration error and the change in the linear speed of the printing rollers, a second mathematical model is obtained. Then, taking into account the characteristics of a linear discrete-time system, the second mathematical model is transformed to obtain a third mathematical model containing incremental trend information. Finally, the actual linear speed control quantity of each printing roller is obtained by combining the model prediction algorithm. This invention, taking into account the characteristics of discrete-time systems, uses a simpler steady-speed model to approximate a complex acceleration model, and uniformly attributes the acceleration disturbances generated during the printing acceleration process to registration error. This can eliminate printing errors in the accelerated printing process and improve the system's response speed and registration accuracy. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments of the present invention are described below. It should be understood that the drawings described below are only for the convenience of clearly describing some embodiments of the technical solutions of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a flowchart illustrating the steps of a fully decoupled overprint control method for the acceleration process of an electronic shaft gravure printing machine, as provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of the electronic shaft gravure printing machine provided in an embodiment of the present invention; Figure 3 The error response curve of the second color group provided in the embodiment of the present invention; Figure 4 Error response curves for the third and fourth color groups provided in this embodiment of the invention; Figure 5 A comparison diagram of error curves for the second color group using the control method of the present invention and the existing proportional-derivative control method is provided for embodiments of the present invention. Figure 6 A comparison diagram of error curves for the third color group using the control method of the present invention and the existing proportional-derivative control method is provided for embodiments of the present invention. Figure 7 A comparison chart of error curves for the fourth color group using the control method of this invention and the existing proportional-derivative control method, provided for embodiments of this invention. Figure 8 This is a schematic diagram of a fully decoupled overprint control system for the acceleration process of an electronic shaft gravure printing machine, provided in an embodiment of the present invention. Figure 9 This is a schematic diagram of the hardware structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit it. In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of this application; they are merely examples of apparatuses and methods consistent with some aspects of the embodiments of this application as detailed in the appended claims.

[0028] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various concepts, but unless otherwise stated, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the words “if,” “when,” or “in response to a determination” as used herein may be interpreted as “when…” or “when…” or “in response to a determination.”

[0029] As used in this application, the terms "at least one", "multiple", "each", "any", etc., "at least one" includes one, two or more, "multiple" includes two or more, "each" refers to each of the corresponding multiples, and "any" refers to any one of the multiples.

[0030] Before providing a detailed description of the embodiments of this application, some of the nouns and terms involved in the embodiments of this application will be explained first. The nouns and terms involved in the embodiments of this application are subject to the following interpretations.

[0031] In the printing process of an electronic shaft gravure printing machine, the complex pattern to be printed is broken down into several simple patterns, which are engraved on the printing rollers respectively. During printing, the substrate passes through the feeding section sequentially through each printing roller, and each printing roller prints the corresponding simple pattern onto the substrate, ultimately resulting in the complex printed pattern. After the electronic shaft gravure printing machine is started, it must go through pre-registration, low-speed registration, and acceleration stages before entering normal printing. Only after the acceleration process is completed does the system truly enter the normal high-speed printing stage, demonstrating the importance of the acceleration process. However, during accelerated printing, color registration errors can occur between units, thus reducing the quality of the printed products.

[0032] Color registration errors during accelerated printing are primarily caused by a combination of factors. First, the acceleration process alters the tension of the substrate (such as paper or film). This tension variation directly affects the positioning accuracy of the printed pattern. If the tension is unstable or unevenly distributed as the substrate passes through each printing unit, deviations in the relative positions of the printed patterns between units will occur. Second, the stability of the printing plate clamping, the cylinder, and the calibration accuracy of the printing plate may also change during acceleration, leading to color registration errors. Furthermore, changes in printing speed and pressure are also significant causes of color registration errors during acceleration. Increasing or decreasing the printing speed affects the contact time between printing surfaces and the ink transfer rate, thus impacting the clarity and color registration accuracy of the printed pattern. Changes in printing pressure directly affect dot reproduction and ink transfer; excessive or insufficient pressure can lead to color registration errors. However, existing color registration control methods for accelerated printing processes are limited, and those that exist suffer from slow response times and low color registration accuracy.

[0033] To address this, this invention proposes a fully decoupled registration control method for the acceleration process of an electronic shaft gravure printing machine. It decouples the color registration error from the change in the linear speed of the printing rollers using a first steady-state mathematical model, resulting in a second mathematical model. This second mathematical model is then transformed to incorporate incremental trend information, taking into account the characteristics of linear discrete-time systems. Finally, a model prediction algorithm is used to obtain the actual linear speed control value for each printing roller. This invention, considering the characteristics of discrete-time systems, uses a simpler steady-state model to approximate a complex acceleration model and uniformly attributes the acceleration disturbances generated during the printing acceleration process to color registration errors. This eliminates printing errors during accelerated printing, improving the system's response speed and color registration accuracy. This fully decoupled registration control method for the acceleration process of an electronic shaft gravure printing machine can be applied to printing, packaging, label making, and art preservation, but is not limited to these applications.

[0034] Reference Figure 1 , Figure 1 This is a flowchart illustrating the steps of a fully decoupled overprint control method for the acceleration process of an electronic shaft gravure printing machine, provided by an embodiment of the present invention. The embodiment of the present invention proposes a fully decoupled overprint control method for the acceleration process of an electronic shaft gravure printing machine, comprising steps S101 to S104: S101. During the acceleration process of the electronic shaft gravure printing machine, the registration error between each color group and the first color group is obtained; Specifically, such as Figure 2The diagram shows the structure of an electronic shaft gravure printing machine. The electronic shaft gravure printing machine includes multiple color groups, each of which is equipped with a registration control system. The registration control system includes a sensor and a controller. The sensor is used to detect color registration errors and send the color registration errors to the controller. The controller is used to control the linear speed of each printing roller according to the calculated actual linear speed control amount. Therefore, in this embodiment of the invention, the color registration error between each color group and the first color group is detected by the sensor on the registration control system of each color group.

[0035] The color registration error includes the color registration error value and acceleration disturbance. This invention classifies the acceleration disturbance generated during the printing acceleration process as color registration error, thereby simplifying the complexity of system calculations, improving system response speed, and ensuring system control accuracy.

[0036] S102. When the color registration error is greater than zero, the first steady-speed mathematical model based on the color registration error and the change in the linear speed of the printing plate roller is decoupled to obtain the second mathematical model. As a further optional implementation, the first steady-state mathematical model for the relationship between color registration error and the change in the linear speed of the printing plate roller is: (1) in, , , i, j, and k are positive integers and s represents the complex variable after the Laplace transform. This represents the color registration error between the i-th color group and the first color group. This represents the change in linear velocity of the i-th printing roller. Let represent the first influence function of the change in the linear velocity of the i-th printing roller on the registration error between the i-th color group and the first color group. The second influence function represents the effect of the change in the linear velocity of the preceding printing roller on the registration error between the i-th color group and the first color group. This indicates the synchronous linear speed of the electronic shaft gravure printing machine. This represents the material feeding length between the i-th printing roller and the (i+1)-th printing roller. , as well as It is a variable and is related to the actual operating parameters of the electronic shaft gravure printing machine.

[0037] As an optional implementation method, through rewrite And then through express The second mathematical model is:

[0038]

[0039] in, This represents the expression for the color matching error vector between the second to the i-th color groups and the first color group. This represents the effect function after decoupling. This represents the vector expression for the linear velocity control quantity of the second to the i-th printing rollers.

[0040] Specifically, adopt rewrite Then the matrix form of the first steady-state mathematical model is: (2) Let the above formula be denoted as ,in and Since all are vectors, to obtain the decoupling relationship, we introduce... ,in: (3) Combining equations (2) and (3), we obtain the second mathematical model: (4) S103. Transform the second mathematical model into the third mathematical model of the linear discrete-time system, and then perform model prediction analysis on the third mathematical model to obtain the fourth mathematical model. As an optional implementation method, the third mathematical model is:

[0041]

[0042] in, This represents the expression for the color matching error vector between the second to the i-th color groups and the first color group. Indicates the increment of color registration error. This represents the linear velocity control increment, where A and B are coefficient matrices and C is the identity matrix.

[0043] Specifically, equation (3) is transformed into the following discrete-time system state-space equation: (5-1) (5-2) in, This represents the material feeding length between the i-th printing roller and the (i+1)-th printing roller. This represents the circumference of the i-th printing roller. Depend on and The ratio is rounded down to obtain the number of rotations of the i-th printing roller when the material is transported from the i-th color group to the next color group. This is a fixed value that is not affected by the material transport speed.

[0044] To incorporate integration to eliminate static error, an incremental model is used as the prediction model (i.e., the third mathematical model): (6-1) (6-2) As an optional implementation method, the fourth mathematical model is:

[0045] Where i and j are positive integers and p represents the prediction time domain, m represents the control time domain, and (k+1|k) represents the prediction of time k+1 from the current time k. Describes the (i-1)-dimensional identity matrix. and It is a coefficient matrix.

[0046] Specifically, based on the fundamental principles of predictive control, the prediction time domain is set to p steps, and the control time domain is set to m steps, where m ≤ p. Outside the control time domain, the predictive control variable remains unchanged, i.e.: (7) Therefore, at the current time k, using the latest measured value calculated according to equation (6-2) and taken as the initial condition, and based on the third mathematical model (6-1), the future state of the system can be predicted as follows: (8) In equation (8), (k+1|k) represents the prediction of the current time k for time k+1, and so on. Furthermore, combining equations (6-1), (6-2), and (8), we can obtain the matrix equation (i.e., the fourth mathematical model) for predicting the system's future p steps as follows: (9) S104. Perform optimal solution analysis on the fourth mathematical model to obtain the actual linear speed control amount of each printing plate roller, and then control the linear speed of the printing plate roller according to the actual linear speed control amount.

[0047] As an optional implementation, the step of performing optimal solution analysis on the fourth mathematical model to obtain the actual linear speed control amount of each printing roller specifically includes the following steps S1041 and S1042: S1041. Design a first objective function, then solve the first objective function, and introduce a preset auxiliary variable to obtain the extreme value solution of the first objective function; S1042. The extreme value solution is restored and decoupled to obtain the actual linear speed control quantity of each printing roller.

[0048] As an optional implementation, the actual linear velocity control amount is determined by the following formula:

[0049] in, This represents the optimal solution expression for the fourth mathematical model. Describes the (i-1)-dimensional identity matrix. Represents a p×1 dimensional block matrix. and The coefficient matrix, This represents the preset error weight matrix for each color group in the prediction time domain. This represents the preset control weight matrix for each color group in the control time domain. This represents the vector expression for the linear velocity control quantity of the second to the i-th printing rollers, obtained according to the second mathematical model. This represents the expression for the color matching error vector between the second to the i-th color groups and the first color group. Indicates the increment of color registration error. denoted by , where represents the actual linear velocity control quantity, and D represents the relation matrix that restores the decoupled control quantity to the control quantity before decoupling.

[0050] Specifically, based on the objective of model predictive control—to obtain the best possible control result with the smallest possible control action—the following first objective function J is designed: (10) Wherein, the first objective function J is a matrix quadratic form. This represents the preset error weight matrix for each color group in the prediction time domain. This represents the preset control weight matrix for each color group in the control time domain. and These are the specific weights corresponding to the 2nd to the i-th color groups, respectively.

[0051] Solving the optimal control problem is equivalent to solving To facilitate calculation, auxiliary variables F, M, and N are introduced, and combined with equation (9), we can obtain: (11) Therefore, the solution can be obtained. Transform into solving ,in The solution to the equation at this point is The extreme point, namely: (12) The extreme value solution can be obtained by solving equation (12). : (13) This is the optimal solution under model predictive control in the embodiments of the present invention. As can be seen from the above expression, It is an m-step control sequence. According to the basic principles of model prediction, only the first step of the control sequence is applied to the system. At the next time step, the above solution steps are repeated to find a new optimal solution, and this process is repeated. Therefore, we can further obtain: (14) Combining equation (3), it can be seen that the above equation calculates... The linear velocity control quantity obtained based on the second mathematical model still needs to be decoupled and reduced to obtain the actual control quantity. : (15) The above describes the fully decoupled registration control method for the accelerated process of the electronic shaft gravure printing machine according to embodiments of the present invention. It can be understood that, compared with existing color registration control technologies, the embodiments of the present invention decouple the first steady-state mathematical model based on the color registration error and the change in the linear speed of the printing plate rollers to obtain a second mathematical model. After decoupling the model, the second mathematical model is transformed in combination with the characteristics of a linear discrete-time system to obtain a third mathematical model containing incremental trend information. Finally, the actual linear speed control quantity of each printing plate roller is obtained by combining the model prediction algorithm. The present invention, taking into account the characteristics of discrete-time systems, uses a simpler steady-state model to approximate a complex acceleration model, and uniformly attributes the acceleration disturbances generated during the printing acceleration process to color registration errors. This effectively and quickly eliminates printing errors in the accelerated printing process, and is simple to implement, consumes low computational resources, and has a fast computational response speed.

[0052] In the simulation experiment, the material threading length between two adjacent units is taken. The circumference is 7.08m, taken as the printing plate roller circumference. It is 0.68m, such as Figure 3-7 The figure shown is a simulation experiment result diagram of an embodiment of the present invention. Figure 3 The error response curve for the second color group is shown. Figure 4 The error response curves for color groups 3 and 4 are shown below. Figure 3 and Figure 4 It can be seen that the error of each color group approaches zero and continues to decrease; Figure 5 This is a comparison chart of the error curves of the second color group using the control method of this invention and the existing proportional-derivative control method. Figure 6 This is a comparison chart of the error curves of the third color group using the control method of this invention and the existing proportional-derivative control method. Figure 7 This is a comparison chart of the error curves of the fourth color group using the control method of this invention and the existing proportional-derivative control method. Figure 5-7 As can be seen, compared with the existing PD method, the control method adopted in the embodiments of the present invention has smaller errors and higher system accuracy.

[0053] Reference Figure 8 This invention also provides a fully decoupled overprint control system for the acceleration process of an electronic shaft gravure printing machine, comprising: The color registration error acquisition module is used to acquire the color registration error between each color group and the first color group during the acceleration process of the electronic shaft gravure printing machine. The model decoupling module is used to decouple the first steady-speed mathematical model based on the color registration error and the change in the linear speed of the printing plate roller when the color registration error is greater than zero, so as to obtain the second mathematical model. The model prediction module is used to transform the second mathematical model into a third mathematical model of a linear discrete-time system, and then perform model prediction analysis on the third mathematical model to obtain a fourth mathematical model. The linear speed control module is used to perform optimal solution analysis on the fourth mathematical model to obtain the actual linear speed control amount of each printing plate roller, and then control the linear speed of the printing plate roller according to the actual linear speed control amount. The color registration error includes the color registration error value and the acceleration disturbance.

[0054] The content of the above embodiments of the fully decoupled overprint control method for the acceleration process of the electronic shaft gravure printing machine is applicable to the embodiments of the fully decoupled overprint control system for the acceleration process of the electronic shaft gravure printing machine. The specific functions implemented by the embodiments of the fully decoupled overprint control system for the acceleration process of the electronic shaft gravure printing machine are the same as those of the above embodiments of the fully decoupled overprint control method for the acceleration process of the electronic shaft gravure printing machine, and the beneficial effects achieved are also the same as those achieved by the above embodiments of the fully decoupled overprint control method for the acceleration process of the electronic shaft gravure printing machine.

[0055] This invention also provides an electronic device, comprising: a memory, a processor, a program stored in the memory and executable on the processor, and a data bus for communication between the processor and the memory. When the program is executed by the processor, it implements the aforementioned fully decoupled overprinting control method for accelerating the electronic shaft gravure printing machine. This electronic device can be any smart terminal, including tablet computers, in-vehicle computers, etc.

[0056] like Figure 9 The diagram shown is a hardware structure schematic of an electronic device provided in an embodiment of the present invention. (Refer to...) Figure 9 This invention provides an electronic device, comprising: The processor 1001 can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of the present invention. The memory 1002 can be implemented as a read-only memory (ROM), static storage device, dynamic storage device, or random access memory (RAM). The memory 1002 can store the operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 1002, and the processor 1001 calls and executes the fully decoupled overprint control method for the accelerated process of the electronic shaft gravure printing machine according to the embodiments of the present invention. Input / output interface 1003 is used to implement information input and output; The communication interface 1004 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.). Bus 1005 transmits information between various components of the device (e.g., processor 1001, memory 1002, input / output interface 1003, and communication interface 1004); The processor 1001, memory 1002, input / output interface 1003 and communication interface 1004 are connected to each other within the device via bus 1005.

[0057] This invention also provides a storage medium, which is a computer-readable storage medium for computer-readable storage. The storage medium stores one or more programs, which can be executed by one or more processors to realize the above-described method for completely decoupled overprint control of the accelerated process of the electronic shaft gravure printing machine.

[0058] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0059] This invention also discloses a computer program product or computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device can read the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, causing the computer device to perform... Figure 1 The method shown.

[0060] In some alternative embodiments, the functions / operations mentioned in the block diagrams may not occur in the order shown in the operation diagrams. For example, depending on the functions / operations involved, two consecutively shown blocks may actually be executed substantially simultaneously, or the aforementioned blocks may sometimes be executed in reverse order. Furthermore, the embodiments presented and described in the flowcharts of this invention are provided by way of example to provide a more comprehensive understanding of the technology. The disclosed methods are not limited to the operations and logic flows presented herein. Alternative embodiments are contemplated in which the order of various operations is changed and sub-operations described as part of a larger operation are executed independently.

[0061] Furthermore, although the invention has been described in the context of functional modules, it should be understood that, unless otherwise stated, one or more of the aforementioned functions and / or features may be integrated into a single physical device and / or software module, or one or more functions and / or features may be implemented in a separate physical device or software module. It is also understood that a detailed discussion of the actual implementation of each module is unnecessary for understanding the invention. Rather, given the properties, functions, and internal relationships of the various functional modules in the apparatus disclosed herein, the actual implementation of the module will be understood within the scope of conventional skill of an engineer. Therefore, those skilled in the art can implement the invention as set forth in the claims using ordinary techniques without excessive experimentation. It is also understood that the specific concepts disclosed are merely illustrative and not intended to limit the scope of the invention, which is determined by the full scope of the appended claims and their equivalents.

[0062] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0063] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-including system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0064] More specific examples (a non-exhaustive list) of computer-readable media include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the aforementioned program can be printed, because the aforementioned program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0065] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0066] In the foregoing description of this specification, references to terms such as "one embodiment," "another embodiment," or "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0067] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

[0068] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A method for completely decoupled overprint control of the acceleration process in an electronic shaft gravure printing machine, characterized in that, Includes the following steps: During the acceleration process of the electronic shaft gravure printing machine, the registration error between each color group and the first color group is obtained; When the color registration error is greater than zero, the first steady-speed mathematical model based on the color registration error and the change in the linear speed of the printing plate roller is decoupled to obtain the second mathematical model. The second mathematical model is transformed into a third mathematical model of a linear discrete-time system, and then model prediction analysis is performed on the third mathematical model to obtain a fourth mathematical model. The optimal solution of the fourth mathematical model is analyzed to obtain the actual linear speed control amount of each printing roller, and then the linear speed of the printing roller is controlled according to the actual linear speed control amount. The color registration error includes the color registration error value and the acceleration disturbance; The third mathematical model is: ； ； in, This represents the expression for the color matching error vector between the second to the i-th color groups and the first color group. Indicates the increment of color registration error. This represents the linear velocity control increment, where A and B are coefficient matrices and C is the identity matrix.

2. The method for completely decoupled overprint control of the acceleration process of an electronic shaft gravure printing machine according to claim 1, characterized in that, The first steady-state mathematical model for the color registration error and the change in the linear speed of the printing plate roller is as follows: ； in, , , i, j, and k are positive integers and s represents the complex variable after the Laplace transform. This represents the color registration error between the i-th color group and the first color group. This represents the change in linear velocity of the i-th printing roller. Let represent the first influence function of the change in the linear velocity of the i-th printing roller on the registration error between the i-th color group and the first color group. The second influence function represents the effect of the change in the linear velocity of the preceding printing roller on the registration error between the i-th color group and the first color group. This indicates the synchronous linear speed of the electronic shaft gravure printing machine. This represents the material feeding length between the i-th printing roller and the (i+1)-th printing roller. , as well as It is a variable and is related to the actual operating parameters of the electronic shaft gravure printing machine.

3. The method for completely decoupled overprint control of the acceleration process of an electronic shaft gravure printing machine according to claim 2, characterized in that, pass rewrite And then through express The second mathematical model is: ； ； in, This represents the expression for the color matching error vector between the second to the i-th color groups and the first color group. This represents the effect function after decoupling. This represents the vector expression for the linear velocity control quantity of the second to the i-th printing rollers.

4. The method for completely decoupled overprint control of the acceleration process of an electronic shaft gravure printing machine according to claim 1, characterized in that, The fourth mathematical model is: ； ； ； ； Where i and j are positive integers and p represents the prediction time domain, m represents the control time domain, and (k+1|k) represents the prediction of time k+1 from the current time k. Describes the (i-1)-dimensional identity matrix. and It is a coefficient matrix.

5. The method for completely decoupled overprint control of the acceleration process of an electronic shaft gravure printing machine according to claim 1, characterized in that, The step of performing optimal solution analysis on the fourth mathematical model to obtain the actual linear speed control value of each printing roller specifically includes: Design a first objective function, then solve the first objective function, and introduce a preset auxiliary variable to obtain the extreme value solution of the first objective function; The extreme value solution is decoupled to obtain the actual linear velocity control value of each printing roller.

6. The method for completely decoupled overprint control of the acceleration process of an electronic shaft gravure printing machine according to claim 1, characterized in that, The actual linear velocity control value is determined by the following formula: ； in, This represents the optimal solution expression of the fourth mathematical model. Describes the (i-1)-dimensional identity matrix. Represents a p×1 dimensional block matrix. and The coefficient matrix, This represents the error weight matrix for each preset color group in a preset time domain. This represents the preset control weight matrix for each color group in the control time domain. This represents the vector expression for the linear velocity control quantity of the second to the i-th printing rollers, obtained according to the second mathematical model. This represents the expression for the color matching error vector between the second to the i-th color groups and the first color group. Indicates the increment of color registration error. denoted by , where represents the actual linear velocity control quantity, and D represents the relation matrix that restores the decoupled control quantity to the control quantity before decoupling.

7. A fully decoupled overprint control system for the acceleration process of an electronic shaft gravure printing machine, characterized in that, include: The color registration error acquisition module is used to acquire the color registration error between each color group and the first color group during the acceleration process of the electronic shaft gravure printing machine. The model decoupling module is used to decouple the first steady-speed mathematical model based on the color registration error and the change in the linear speed of the printing plate roller when the color registration error is greater than zero, so as to obtain the second mathematical model. The model prediction module is used to transform the second mathematical model into a third mathematical model of a linear discrete-time system, and then perform model prediction analysis on the third mathematical model to obtain a fourth mathematical model. The linear speed control module is used to perform optimal solution analysis on the fourth mathematical model to obtain the actual linear speed control amount of each printing plate roller, and then control the linear speed of the printing plate roller according to the actual linear speed control amount. The color registration error includes the color registration error value and the acceleration disturbance; The third mathematical model is: ； ； in, This represents the expression for the color matching error vector between the second to the i-th color groups and the first color group. Indicates the increment of color registration error. This represents the linear velocity control increment, where A and B are coefficient matrices and C is the identity matrix.

8. An electronic device, characterized in that, The electronic device includes a memory, a processor, a program stored in the memory and executable on the processor, and a data bus for enabling communication between the processor and the memory. When the program is executed by the processor, it implements the steps of the fully decoupled overprint control method for the accelerated process of the electronic shaft gravure printing machine as described in any one of claims 1 to 6.

9. A storage medium, said storage medium being a computer-readable storage medium for computer-readable storage, characterized in that, The storage medium stores one or more programs, which can be executed by one or more processors to implement the steps of the electronic shaft gravure printing machine acceleration process complete decoupling overprint control method as described in any one of claims 1 to 6.

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