Duplexed Control System Tracking Bus Interruption Detection
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Solution Overview
Problem
In duplexed control systems, particularly in power plants, conventional technologies fail to detect tracking signal interruptions accurately, leading to potential erroneous operations where both systems may attempt to control the same target due to inability to differentiate between partner system abnormalities and tracking bus abnormalities.
Innovation Solution
A duplexed control system with own-system state evaluation and other-system signal confirmation sections, along with a transmission channel changeover mechanism, allows each control device to detect and respond to tracking signal interruptions by switching to alternative transmission channels, ensuring accurate system state confirmation and preventing simultaneous regular or reserve mode operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional personal computers or controllers with Ethernet are used to connect the tracking bus, then the system can be implemented with standard components, but the tracking bus cannot detect signal interruption events such as connector disconnection or bus disconnection
Solution Approach 1:
The patent introduces a tracking signal interruption detection function as an intermediary mechanism between the control devices and the tracking bus. This detection function monitors the tracking signals on the bus and identifies interruption events, enabling the system to distinguish between partner system abnormalities and tracking bus abnormalities without requiring special hardware modifications to the bus itself.
Solution Approach 2:
The patent implements a feedback mechanism where the control devices continuously monitor the tracking signals exchanged through the tracking bus. When a signal interruption is detected, the system receives feedback about the abnormality and can respond by switching to the other control device, thereby creating a closed-loop system that actively responds to tracking bus failures.
2Device complexity
If the tracking bus lacks signal interruption detection capability, then the system structure remains simple, but both control devices may mistakenly identify each other as abnormal and shift into regular system mode simultaneously
Solution Approach 1:
The patent introduces a tracking signal interruption detection function as an intermediary mechanism between the control devices and the tracking bus. This detection function monitors the tracking signals on the bus and identifies interruption events, enabling the system to distinguish between partner system abnormalities and tracking bus abnormalities without requiring special hardware modifications to the bus itself.
Solution Approach 2:
The patent implements a feedback mechanism where the control devices continuously monitor the tracking signals exchanged through the tracking bus. When a signal interruption is detected, the system receives feedback about the abnormality and can respond by switching to the other control device, thereby creating a closed-loop system that actively responds to tracking bus failures.
3Reliability
If both control devices attempt to control the same target due to inability to differentiate abnormalities, then the system loses redundancy benefit, but implementing detection increases system complexity
Solution Approach 1:
The patent introduces a tracking signal interruption detection function as an intermediary mechanism between the control devices and the tracking bus. This detection function monitors the tracking signals on the bus and identifies interruption events, enabling the system to distinguish between partner system abnormalities and tracking bus abnormalities without requiring special hardware modifications to the bus itself.
Solution Approach 2:
The patent implements a feedback mechanism where the control devices continuously monitor the tracking signals exchanged through the tracking bus. When a signal interruption is detected, the system receives feedback about the abnormality and can respond by switching to the other control device, thereby creating a closed-loop system that actively responds to tracking bus failures.
Data Source
AI summary
A duplexed control system comprises: two control devices, whereof one is set to operate as a reserve system and the other is set to operate as a regular system; a tracking bus that connects the two control devices to enable these to exchange tracking signals; and a control transmission channel that transmits computational information of these two control devices; wherein: the control devices respectively have: an own-system state evaluation section that transmits the result of state evaluation of its own system as a tracking signal through the tracking bus to the other system; an other-system signal confirmation section that receives the tracking signal through the tracking bus from the control device of the other system and thus performs state confirmation; and a transmission channel changeover section that, if the tracking signal cannot be received through the tracking bus, effects transmission of the tracking signal to the other-system signal confirmation section of the other system, through the control transmission channel.