Hierarchical Field Device Diagnostics for False Fail Prevention
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Solution Overview
Problem
Conventional field device diagnostic methods are inflexible and fail to accurately diagnose the operating state under specific use conditions, often resulting in incorrect 'Fail' diagnoses due to noise or other known conditions, which affects the adaptability of the diagnosis.
Innovation Solution
The field device incorporates a diagnoser that can selectively enable or disable diagnostic results of subsequent processes based on predefined parameters, allowing it to treat known conditions as 'Pass' and prevent cascading 'Fail' diagnoses, thereby improving diagnostic adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hierarchical diagnostic processes are implemented where diagnostic results are used across multiple processes, then diagnostic completeness is improved, but diagnostic accuracy deteriorates under specific use conditions due to cascading Fail results
Solution Approach 1:
The patent implements dynamic parameter adjustment where the diagnoser modifies diagnostic parameters based on detected use conditions. When specific conditions are recognized, the system dynamically changes which diagnostic processes are executed or how their results are weighted, allowing the diagnostic behavior to adapt to the current operational context rather than following a fixed hierarchical pattern.
Solution Approach 2:
The system changes diagnostic parameters based on detected use conditions. The diagnoser identifies specific operational contexts and adjusts diagnostic parameters accordingly, such as disabling certain diagnostic processes or modifying evaluation criteria when known conditions that cause false failures are detected, thereby maintaining diagnostic accuracy across varying operational scenarios.
2Reliability
If all diagnostic processes are executed hierarchically with result propagation, then comprehensive diagnosis is achieved, but adaptability to specific use conditions deteriorates
Solution Approach 1:
The patent implements dynamic parameter adjustment where the diagnoser modifies diagnostic parameters based on detected use conditions. When specific conditions are recognized, the system dynamically changes which diagnostic processes are executed or how their results are weighted, allowing the diagnostic behavior to adapt to the current operational context rather than following a fixed hierarchical pattern.
Solution Approach 2:
The patent extracts or removes specific diagnostic processes from the hierarchical execution path when certain use conditions are detected. The diagnoser identifies conditions where particular diagnostic processes would produce incorrect results and excludes those processes from execution or result propagation, thereby maintaining comprehensive diagnosis while adapting to specific operational contexts.
3Reliability
If diagnostic processes are made rigid to ensure consistent evaluation, then diagnostic reliability is improved, but ease of operation deteriorates due to inability to handle specific conditions
Solution Approach 1:
The diagnoser automatically detects use conditions and self-adjusts diagnostic parameters without requiring manual intervention. The system monitors operational conditions, identifies when specific conditions exist that would cause incorrect diagnostic results, and autonomously modifies the diagnostic process execution or parameter settings, maintaining both consistency and flexibility.
Solution Approach 2:
The system incorporates feedback mechanisms where diagnostic results and operational conditions are continuously monitored. When feedback indicates a specific use condition that would lead to incorrect diagnosis, the system adjusts its diagnostic behavior accordingly, allowing consistent evaluation under normal conditions while adapting to special cases through automated feedback-driven parameter modification.
Data Source
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AI summary
In order to improve the adaptability of diagnosis of an operating state of a field device, a field device 10 according to the present disclosure has a diagnoser 17 configured to diagnose an operating state of the field device 10 by hierarchically implementing a plurality of diagnostic processes. The diagnoser 17 can select whether to enable or disable a diagnostic result of at least one diagnostic process of a plurality of diagnostic processes in a diagnostic process after the one diagnostic process.