AGV Group Synchronization Over Non-Real-Time WLAN
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Solution Overview
Problem
Driverless transport systems, such as AGVs, face challenges in synchronized movement due to non-real-time capable data transmission, which hinders efficient logistic operations and group formation.
Innovation Solution
The system synchronizes time bases among vehicles using a data transmission channel, allowing for buffered command execution and synchronized movement by determining time offsets and quality code numbers, enabling coordinated movement even with periodic data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data transmission is performed periodically at high data transmission rate via WLAN connection, then data can be transmitted without real-time capability, but synchronized movement of subscribers becomes difficult to achieve
Solution Approach 1:
The system performs preliminary actions by storing guide values and control commands in buffer memories before they are needed for execution. This allows the system to prepare movement instructions in advance, so that when data is transmitted periodically via WLAN, the subscribers already have the necessary information buffered and ready to execute, minimizing synchronization delays and maintaining reliable coordinated movement without requiring real-time transmission capability.
2Productivity
If subscribers store guide values in buffer memory and execute them without interruption, then movement can continue smoothly, but data transmission must be non-real-time capable
Solution Approach 1:
The control system is segmented into multiple independent subscribers, each with its own buffer memory and execution capability. Instead of requiring a centralized real-time control system, the guidance data is divided into discrete control words that can be stored individually in buffer memories. This segmentation allows each subscriber to execute stored commands independently and simultaneously, maintaining high productivity while eliminating the need for complex real-time data transmission infrastructure.
3Productivity
If group formation is performed quickly and simply, then logistic objectives are achieved rapidly, but coordination among multiple subscribers becomes complex
Solution Approach 1:
Each subscriber is equipped with autonomous capabilities to determine its own position, identify other subscribers, and calculate relative positions independently. Instead of requiring a complex centralized coordination mechanism, each unit performs self-service by autonomously forming groups based on simple criteria such as proximity or task requirements. This self-service approach enables rapid group formation while keeping the coordination mechanism simple, as each subscriber independently executes the same straightforward algorithms without requiring complex inter-subscriber communication protocols.
Data Source
AI summary
In a method for operating a system for intralogistic transport and system, the system having subscribers, in particular vehicles, which are connected via a data transmission channel such that each subscriber is a subscriber of a group of subscribers connected for data transmission via the data transmission channel, the data transmission being in particular not real-time capable, the data transmission channel being in particular a WLAN connection, each subscriber having a time base, in particular a clock, a group is formed; the time base of each subscriber of the group is synchronized, that is, in particular the time of the time base of the subscriber modified by a specific time offset by the synchronization is used as the time for operation; and subscribers are moved in dependence on a respective subscriber functioning as a master or in mutual dependence, in particular the position activated by the respective subscriber, in particular at the respective point in time, depending on the respective position of at least one other subscriber of the group or on the respective position of multiple or all other subscribers of the group.