Wireless Control System Relay Terminals for Industrial Robotics
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Solution Overview
Problem
In wireless control systems, especially in industrial robotics, the quality of control deteriorates when the terminal cannot transmit the latest state signal within one cycle after receiving the control signal, leading to increased Age of Information (AoI) and potential disconnections in the wireless line.
Innovation Solution
The system employs terminals that can operate as relayed terminals or downlink relay terminals, allowing for the transmission of state signals and control signals through relay terminals, thereby maintaining control signal generation based on recent state signals even in cases of wireless line disconnections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the terminal transmits the latest state signal within one cycle after receiving the control signal, then the quality of control is improved, but the reliability deteriorates when obstacles block the wireless line
Solution Approach 1:
The patent introduces a relay terminal as an intermediary device to forward control signals and state signals between the controller and the terminal when the direct wireless line is blocked. The relay terminal receives signals from the controller and transmits them to the target terminal, maintaining communication reliability without compromising control quality by ensuring signals are still delivered within one cycle through the relay path
2Reliability
If the terminal cannot transmit the latest state signal within one cycle, then the reliability is maintained through relay transmission, but the quality of control deteriorates due to increased AoI
Solution Approach 1:
The patent implements preliminary action by having the relay terminal prepare and forward state signals to the controller in advance through the relay path. The relay terminal receives state signals from the terminal and proactively transmits them to the controller before the next control cycle begins, ensuring the controller receives updated state information within one cycle even when direct transmission is blocked, thereby maintaining both reliability and control quality
Data Source
AI summary
According to one embodiment, a wireless control system includes terminals and a controller. The terminals can operate as a relayed or a downlink relay terminal. The downlink relay terminal is configured to transmit a first state signal representing a state of its own control target and a first control signal for controlling a control target of the relayed terminal. The relayed terminal is configured to obtain a second state signal representing a state of its own control target after receiving the first control signal, transmit the second state signal, and control its own control target based on the first control signal.