Lubricant-Specific Malfunction Detection for Movable Parts
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Solution Overview
Problem
Conventional malfunction detection methods fail to accurately determine malfunctions in apparatuses with movable parts, such as motors and speed reducers, due to variations in lubricant types, leading to false alarms or missed malfunctions.
Innovation Solution
A malfunction detection device that compares data from sensors on movable parts with thresholds adjusted based on the type of lubricant used, ensuring accurate determination of malfunctions by varying the comparison criteria according to the lubricant type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed threshold is used for malfunction detection, then the detection method is simple, but the detection accuracy deteriorates due to variations in lubricant types
Solution Approach 1:
The threshold value is made dynamic by varying it according to the type of lubricant used in the movable part. The malfunction detection device selects different threshold values based on lubricant type information, allowing the detection criterion to adapt to different lubricant characteristics rather than using a fixed threshold.
Solution Approach 2:
The threshold parameter is changed based on the lubricant type. The device stores multiple threshold values corresponding to different lubricant types and selects the appropriate threshold based on the detected lubricant type, thereby optimizing the detection accuracy for each specific lubricant condition.
2Reliability
If lubricant-specific thresholds are used, then the malfunction detection accuracy is improved, but the device complexity increases due to multiple threshold values
Solution Approach 1:
Multiple threshold values corresponding to different lubricant types are pre-stored in the device's storage unit. This preliminary preparation allows the device to quickly retrieve and apply the appropriate threshold without complex real-time calculations, reducing the operational complexity while maintaining high reliability.
Solution Approach 2:
The malfunction detection device automatically selects and applies the appropriate threshold value based on the detected lubricant type without requiring external intervention. The device self-manages the threshold selection process by comparing the lubricant type information with stored thresholds and autonomously applying the correct criterion.
Data Source
AI summary
A malfunction detection device compares detected data on a condition at a predetermined part of an apparatus with a threshold so as to determine a malfunction of the apparatus. The malfunction detection device varies the threshold in accordance with a type of a lubricant used for movable parts of the apparatus.