Cooling Device Fatigue Estimation via Thermal Distortion
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Solution Overview
Problem
Current technologies do not provide a method to estimate the degree of fatigue accumulated in cooling devices, such as intercoolers, which is essential for timely replacement or maintenance.
Innovation Solution
A damage estimation device and method that acquires temperature change and period length data to derive a distortion amount, considering both temperature change and period length, and integrates this to estimate the accumulated fatigue in cooling devices, with notification for maintenance when the fatigue exceeds a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature change amount is used to derive distortion amount, then estimation accuracy of fatigue is improved, but the complexity of the estimation process increases
Solution Approach 1:
The patent applies parameter changes by using multiple parameters (temperature change amount and period length) to derive the distortion amount, rather than relying on a single parameter. This allows for more accurate fatigue estimation by capturing the dynamic nature of thermal distortion, while the mathematical formulation keeps the calculation process manageable through defined relationships between parameters.
Solution Approach 2:
The patent introduces a temporal dimension by incorporating period length alongside temperature change amount. This transforms the estimation from a static temperature-based calculation to a dynamic process that considers both the magnitude and duration of temperature changes, thereby improving accuracy without requiring complex physical models.
2Device complexity
If the distortion amount is derived considering only temperature change amount, then the calculation is simpler, but the estimation accuracy of fatigue accumulation is reduced
Solution Approach 1:
The patent modifies the calculation approach by introducing period length as an additional parameter that works in conjunction with temperature change amount. This creates a more comprehensive distortion amount calculation that reflects real-world thermal cycling conditions, improving fatigue accumulation estimation while maintaining computational feasibility through defined mathematical relationships.
3Productivity
If the period length is not considered in distortion amount derivation, then the processing is faster, but the accuracy of fatigue estimation is reduced
Solution Approach 1:
The patent adds the temporal dimension of period length to the distortion calculation, enabling the system to differentiate between rapid and gradual temperature changes. This allows for more accurate fatigue estimation by capturing the rate of thermal cycling, while the computational overhead remains acceptable due to the straightforward mathematical formulation.
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
Accurately estimates the fatigue in cooling devices, enabling timely maintenance and preventing overheating issues, thereby improving the reliability and longevity of the cooling system.
Implementation Method 1
a cooling device 14 that cools air that flows through an intake passage 12
Implementation Method 2
In the period during which the inflow air temperature rises, temperature distribution is generated in the cooling device, and therefore, distortion is generated in the cooling device
Data Source
AI summary
A damage estimation device includes an acquisition unit that acquires a temperature change amount in a period during which an inflow air temperature rises and a period length, a distortion amount derivation unit that derives a distortion amount of a cooling device in the above period, based on the temperature change amount, and a damage value derivation unit that derives an accumulated damage value by integrating a value depending on the distortion amount. When the period length is shorter than a period length determination value, the distortion amount derivation unit derives a larger value as the distortion amount than when the period length is equal to or longer than the period length determination value.