Inline Printing Parameter Control via Dynamic Variable Switching
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Solution Overview
Problem
Existing inline control systems for printing parameters in printing presses face challenges in balancing control dynamics and accuracy, particularly under varying operating conditions, leading to unstable control behavior due to outliers and fluctuations in individual printing parameters.
Innovation Solution
The system dynamically switches between using individual printing parameters and average values, depending on the operating state of the printing press, to optimize control dynamics and accuracy. This involves switching between different average values based on the number of individual printing parameters used to calculate them, and adjusting the controlled variable in response to deviations between these values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If each individual printing parameter is used as the controlled variable, then control dynamics are improved and rapid control is achieved, but control stability deteriorates due to fluctuations and outliers in individual parameters
Solution Approach 1:
The system dynamically adjusts the controlled variable based on operating conditions. During start-up and transient states, individual printing parameters are used as the controlled variable to achieve rapid control responses. During stable production, the controlled variable switches to average values to ensure control stability. This dynamic adaptation resolves the contradiction between control dynamics and stability.
2Stability of the object's composition
If an average value from multiple individual printing parameters is used as the controlled variable, then control stability is improved by compensating for outliers, but control dynamics deteriorate and adjustment speed slows down
Solution Approach 1:
The system switches between using individual printing parameters and average values as the controlled variable depending on the operating state. During stable production, average values are used to smooth out fluctuations and improve control stability. During start-up or transient conditions, individual parameters are used to maintain fast control dynamics. This resolves the contradiction by applying the appropriate control strategy at the right time.
3Measurement precision
If a larger number of individual printing parameters are used to calculate the average value, then control accuracy is improved by better compensation of outliers, but device complexity and calculation requirements increase
Solution Approach 1:
The system applies different levels of averaging based on the specific operating condition and detection area. Not all detection areas or operating states require the same degree of averaging. By locally adapting the number of parameters used for averaging, the system achieves high control accuracy where needed while minimizing unnecessary calculation complexity in other areas.
4Adaptability or versatility
If the controlled variable is switched between individual printing parameters and average values based on operating state, then both control dynamics and control accuracy are optimized for different conditions, but system complexity increases
Solution Approach 1:
The control system dynamically switches between different controlled variables (individual printing parameters or average values) based on the detected operating state. During start-up, transient conditions, or when high control dynamics are needed, individual parameters are used. During stable production, average values are used to optimize control accuracy. This dynamic switching strategy enables the system to adapt to varying operating conditions while managing complexity through automated state detection and switching logic.
Data Source
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AI summary
The invention relates to a method for inline control of a printing parameter, wherein, for controlling the printing parameter in successively produced printed copies and/or during each printing cylinder rollover in each detection area, a print mark is detected by means of a detection device and an individual printing parameter is determined from each detected print mark, wherein either each individual printing parameter or a first average value from a first number n1 of individual printing parameters or a second average value from a second number n2 of individual printing parameters is used as the controlled variable. The invention is therefore based on the object of creating a solution with which, depending on the respective operating state of the printing press, high control dynamics and thus a reduction in setup time and waste, or high control accuracy and thus consistently high product quality can be ensured.The object is achieved according to the invention in that during a print production, the control variable changes between the individual print parameter and the first average value and/or the second average value and/or between the first average value and the second average value.