Vehicle Power Supply Path Degradation Detection by Voltage Correlation
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Solution Overview
Problem
Existing on-board power supply systems for vehicles face challenges in accurately and reliably identifying anomalous degradation states in power supply paths, which can lead to impaired electrical conductivity and potential path breakage, especially in electric vehicles, where redundancy is not always sufficient to prevent failures.
Innovation Solution
An on-board power supply system with voltage-measuring devices at both ends of the power supply path and an evaluation apparatus that cross-correlates voltage profiles to identify anomalous degradation by measuring the cross-correlation coefficient, allowing for predictive diagnosis and preventive measures to maintain component availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage-measuring devices and cross-correlation analysis are implemented, then degradation detection precision is improved, but device complexity increases
Solution Approach 1:
The patent introduces an evaluation apparatus as an intermediary component that performs cross-correlation analysis on voltage profiles from multiple measuring devices. This mediator processes the raw voltage data to extract degradation information, thereby improving detection precision while isolating the complexity from the core power supply path monitoring
Solution Approach 2:
The patent replaces physical redundancy (multiple complete power supply paths) with a diagnostic system using voltage measuring devices and cross-correlation analysis. This substitution uses electrical measurements and signal processing to detect degradation, reducing the need for redundant mechanical/electrical infrastructure while improving detection capability
2Reliability
If redundant power supply paths are used, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements preliminary detection of degradation states by continuously monitoring voltage profiles and performing cross-correlation analysis before actual failures occur. By detecting anomalies early in the degradation process, the system can take preventive actions or switch to backup paths before redundancy is critically needed, thereby improving reliability without requiring constant redundant path activation
Solution Approach 2:
The patent establishes a feedback loop where voltage measurements from the power supply path are continuously analyzed through cross-correlation, and the results are used to identify degradation states. This feedback mechanism enables real-time monitoring and predictive maintenance, improving reliability by detecting issues before they cause failures while avoiding the complexity of full redundancy
3Measurement precision
If cross-correlation analysis is performed, then measurement precision is improved, but computing outlay increases
Solution Approach 1:
The patent applies partial cross-correlation analysis by focusing on specific voltage profile characteristics and using predefined criteria for degradation identification. Rather than performing exhaustive analysis on all possible parameters, the system selectively analyzes relevant voltage profile features, thereby maintaining high detection precision while reducing computational energy consumption
Data Source
AI summary
An on-board power supply system for a vehicle includes an electrical power supply path, a first voltage-measuring apparatus at a first end of the power supply path, a second voltage-measuring apparatus at a second end of the power supply path, and an evaluation device which is connected to the voltage-measuring apparatuses and is configured to subject a first voltage curve measured by way of the first voltage-measuring apparatus and a second voltage curve measured by way of the second voltage-measuring apparatus to a cross-correlation, and then, if the result of the cross-correlation meets a predetermined criterion, to determine an anomalous degradation state of the power supply path.