Compressor Impeller Deterioration Estimation via Sectioned Fatigue Analysis
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Solution Overview
Problem
Existing methods for estimating the deterioration of vehicle components, such as those described in Japanese Unexamined Patent Application Publication No. 2016-56762, require large storage capacities due to the continuous storage of inflection points until rotation speed thresholds are met, leading to inefficient data management.
Innovation Solution
A deterioration estimation device that calculates small and middle section average values and amplitudes of parameters to determine damage values, integrating these to estimate the component's deterioration degree, thereby reducing the amount of data stored and efficiently managing memory usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the inflection point is continuously stored in the storage device until the rotation speed becomes equal to or lower than the threshold value, then the fatigue value can be accurately calculated by performing a cycle count in the section, but the number of inflection points stored in the storage device becomes very large, requiring a storage device with a relatively large storage capacity
Solution Approach 1:
The patent segments the continuous storage requirement into discrete, manageable sections. Instead of storing all inflection points continuously, the method divides the operation into sections defined by start points (when rotation speed becomes equal to or lower than threshold) and end points (next inflection point). Only the necessary inflection points for each section are stored and processed, enabling accurate fatigue calculation while limiting storage requirements to what is needed for current section analysis rather than all historical data.
2Reliability
If a storage device with relatively large storage capacity is used to store all inflection points, then the fatigue failure diagnosis can be performed accurately, but the device complexity and cost increase
Solution Approach 1:
The patent extracts only the essential data needed for fatigue analysis from the continuous stream of inflection points. By identifying and storing only the inflection points that define section boundaries (start points at threshold crossings and end points at subsequent inflection points), the method extracts the minimum necessary dataset for accurate fatigue calculation. This extraction approach maintains diagnostic reliability while eliminating the need for complex, large-capacity storage systems designed to hold all possible inflection points.
Data Source
AI summary
In the processing circuit of the control device, the stress of the compressor impeller is acquired every predetermined control cycle. Setting a small section, and calculating a small section average value and a small section amplitude are repeatedly executed. Setting a middle section, and calculating a middle section average value and a middle section amplitude are repeatedly executed. The first damage value is calculated based on the small section average value and the small section amplitude. The second damage value is calculated based on the middle section average value and the middle section amplitude. An estimated value of the deterioration degree of the compressor impeller is calculated based on the integrated value of the first damage value and the second damage value.