Distributed Control Data Synchronization for Accurate Command Calculation
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Solution Overview
Problem
Existing control systems in distributed control systems do not effectively calculate control commands for control targets from acquisition information acquired at different times, leading to suboptimal control accuracy.
Innovation Solution
A control apparatus with a time synchronization unit, communication unit, information holding unit, area setting unit, information selection unit, and shared data storage unit is implemented to synchronize and manage data across control apparatuses, allowing for the calculation of control commands from information acquired at different times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If control apparatuses in a distributed control system use cyclic transmission to share data, then communication load is reduced, but control accuracy deteriorates because acquisition information from different times cannot be properly utilized
Solution Approach 1:
The patent applies preliminary action by storing acquisition information with timestamps in advance before control command generation. The control apparatus accumulates acquisition information from multiple detectors over time in a storage unit, preserving temporal information. When generating control commands, the system can then select and combine acquisition information from different time points appropriately, enabling accurate control while maintaining efficient cyclic transmission.
2Manufacturing precision
If control apparatuses synchronize time and share data across the network, then control accuracy improves by using acquisition information from different times, but device complexity increases due to additional synchronization and data management units
Solution Approach 1:
The patent applies universality by designing control apparatuses where the communication unit performs multiple functions: it both transmits control commands to actuators and receives/shares acquisition information from other control apparatuses. The storage unit serves dual purposes by storing both locally acquired data and received shared data. This multi-functionality reduces the need for separate dedicated components, managing system complexity while enabling time-synchronized multi-source data utilization for improved control accuracy.
Data Source
AI summary
A control apparatus of the present invention is a control apparatus included in a distributed control system. The control apparatus includes a time synchronization unit configured to synchronize the control apparatus with another control apparatus included in the distributed control system in terms of time, a communication unit configured to receive information from the other control apparatus, an information holding unit configured to add synchronization time information to the information and hold the resulting information, an area setting unit configured to set an area of the information holding unit according to a time difference of the information, an information selection unit configured to select shared data from the information stored in the information holding unit, and a shared data storage unit configured to store the shared data selected by the information selection unit.