Thermistor Transient Fault Detection via Dynamic Load Monitoring
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Solution Overview
Problem
Conventional methods for detecting thermistor failures, particularly those showing abnormal electric resistance values momentarily, are inadequate as they rely on instantaneous measurements without applying a load, making it difficult to detect transient faults.
Innovation Solution
A detection method that applies a load over time, measures the thermistor's physical property values at least twice during this period, and uses the measured data to detect failures based on changes in the electric resistance value, employing a moving average to prevent false positives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If instantaneous measurement without load is used, then measurement simplicity is maintained, but detection precision for transient faults deteriorates
Solution Approach 1:
The patent applies dynamic measurement by continuously monitoring the thermistor's electric resistance value while a load is being applied, rather than taking a single instantaneous measurement. This dynamic approach allows the detection of transient faults that occur during operation, as the measurement system tracks changes in resistance over time during the load application period
Solution Approach 2:
The patent performs preliminary action by applying a load to the thermistor before measurement to induce transient fault conditions. The load is applied in advance to create the operational stress conditions under which transient faults are most likely to occur, enabling the detection system to observe the thermistor's behavior under realistic operating conditions
2Reliability
If single time point measurement is used, then measurement time is reduced, but reliability of fault detection deteriorates
Solution Approach 1:
The patent implements continuous measurement of the electric resistance value throughout the entire load application period, rather than taking a single measurement at one time point. This continuous monitoring ensures that transient faults occurring at any moment during the load application are captured, significantly improving detection reliability while the measurement time is constrained to the necessary load application duration
Solution Approach 2:
The patent applies a load for a specific duration longer than what would be needed for a simple resistance check, allowing multiple measurements to be taken during the load application. This excessive action in terms of measurement frequency and load duration ensures that transient faults are captured, with the measurement time optimized to the minimum necessary to detect faults while maintaining reliability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the ability to detect thermistors with transient faults by focusing on changes in electric resistance values over time, improving the accuracy of fault detection and reducing false alarms.
Implementation Method 1
measuring a physical property value of the thermistor at least at a first time and a second time during a time period in which the load is being applied to the thermistor; and detecting the failure of the thermistor based on first data indicating the physical property value of the thermistor measured at the first time and second data indicating the physical property value of the thermistor measured at the second time
Data Source
AI summary
There is provided a detection method for detecting a failure of a thermistor, the detection method comprising: applying a load to the thermistor over time; measuring a physical property value of the thermistor at least at a first time and a second time during a time period in which the load is being applied to the thermistor; and detecting the failure of the thermistor based on first data indicating the physical property value of the thermistor measured at the first time and second data indicating the physical property value of the thermistor measured at the second time.