EV Electric Component Diagnostics via Physical Load History
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Solution Overview
Problem
Existing electric vehicle diagnostic methods cannot predict abnormalities in electric components until a change occurs in their electric characteristics, making it difficult to determine if a component is damaged before a change happens.
Innovation Solution
A method and system that detect physical loads applied to the vehicle body and use a history of these loads to determine the likelihood of damage to electric components, allowing for predictive diagnostics based on mechanical impacts rather than just electric characteristics, with different diagnostic modes and criteria depending on the likelihood of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diagnostic methods rely only on electric characteristics of electric components, then the diagnostic system remains simple, but abnormalities cannot be detected until electric characteristics actually change
Solution Approach 1:
The patent applies preliminary action by detecting physical loads (mechanical impacts, vibrations, shocks) before they cause damage to electric components. The diagnostic system monitors physical stressors that may lead to component failure, enabling preventive diagnostics before electric characteristics actually change. This allows the system to predict potential abnormalities based on mechanical stress history rather than waiting for electrical parameter deviations.
2Measurement precision
If the diagnostic criterion is made more strict to detect potential damage earlier, then abnormality detection sensitivity increases, but false positives increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting diagnostic criteria based on the detected physical load history. When significant mechanical impacts or vibrations are detected, the system switches to a second diagnostic mode with stricter evaluation criteria for electric characteristics. This adaptive approach allows the system to maintain high sensitivity during high-stress periods while avoiding false positives during normal operation, as the diagnostic threshold is modulated according to the actual mechanical stress experienced by the components.
Data Source
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AI summary
A method of diagnosing an electric vehicle incorporating an electric component, comprises detecting a physical load applied to a vehicle body, which is other than an electric characteristic of the electric component (step S401); and changing a diagnostic operation for the electric component based on the electric characteristic of the electric component such that the diagnostic operation is performed based on the detected physical load applied to the vehicle body (step S403 to S406).