Article Transport Control Handover at Branch and Merge Sections
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing article transport facilities face control challenges when communication faults or failures occur, leading to potential interference between transport vehicles at branch and merge points, as zone controllers are unable to effectively manage vehicles in their designated zones.
Innovation Solution
An article transport facility with a higher-level control device and section control devices that operate in normal and substitute control modes, allowing the higher-level control device to take over vehicle control in case of communication anomalies, ensuring continuous and safe navigation through specific sections with branch and merge points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If zone controllers are used to control transport vehicles in designated zones, then local control efficiency is improved, but system reliability deteriorates when communication faults occur
Solution Approach 1:
The control system is segmented into multiple independent zone controllers, each capable of autonomously managing its designated zone. This segmentation allows local control operations to continue independently even when other zones experience communication faults, thereby maintaining system reliability while preserving local control efficiency.
Solution Approach 2:
The zone controllers are pre-configured with control algorithms and decision-making capabilities before deployment. This preliminary action enables them to immediately take over control functions when communication with the central controller is lost, ensuring continuous reliable operation without waiting for external instructions.
2Reliability
If higher-level control device manages all transport vehicles, then system-wide coordination is improved, but processing load on control device increases
Solution Approach 1:
The control functions are segmented and distributed to multiple zone controllers rather than concentrated in a single higher-level device. Each zone controller handles local vehicle coordination, reducing the processing load on the higher-level device while maintaining system-wide coordination through inter-zone communication protocols.
Solution Approach 2:
The control architecture transitions from a centralized single-dimensional hierarchy to a multi-dimensional distributed structure. Zone controllers operate at the local dimension while the higher-level device operates at the system dimension, allowing parallel processing that reduces overall processing load while maintaining coordination.
3Speed
If section control devices operate independently, then response speed is improved, but ability to handle communication anomalies deteriorates
Solution Approach 1:
Zone controllers implement feedback mechanisms that continuously monitor communication status with the higher-level device and adjacent zones. When communication anomalies are detected, the feedback triggers automatic mode switching to independent operation, allowing fast local response while maintaining reliability through adaptive anomaly handling.
Solution Approach 2:
The control system dynamically adjusts its operational mode based on communication conditions. Zone controllers can switch between centralized coordinated mode and independent autonomous mode, optimizing response speed during normal operation while ensuring reliability when communication anomalies occur.
Data Source
AI summary
A normal control mode and a substitute control mode are set, as control modes that are executed by a control system including a higher-level control device and a section control device. The normal control mode is a mode in which control of a transport vehicle in a specific section is performed by the section control device responsible for the specific section, and the substitute control mode is a mode in which control of the transport vehicle in a specific section is performed by the higher-level control device instead of the section control device responsible for the specific section. The substitute control mode is executed in response to at least one of an anomaly occurring in communication between the section control device and the higher-level control device and an anomaly occurring in communication between the section control device and the transport vehicle.