Vehicle Power Supply Capacitor Degradation Assessment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vehicle power supply devices inaccurately determine the degradation of capacitor units, leading to premature replacement of functional components and reduced lifespan, as they rely on temperature-correlated internal resistance and capacitance values without accounting for varying degradation rates and conditions.
Innovation Solution
A vehicle power supply device comprising a capacitor unit, temperature sensor, charge circuit, voltage detector, current detector, controller, and storage that performs correction calculations and uses multiple degradation determination formulas to accurately assess the degradation level of capacitors based on internal resistance and capacitance values, ensuring accurate determination and extended usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature-correlated internal resistance and capacitance values are used for degradation determination, then degradation assessment can be performed, but measurement precision deteriorates due to varying degradation rates and conditions not being accounted for
Solution Approach 1:
The patent applies parameter changes by switching between different degradation determination formulas based on the operating temperature range. The controller selects from multiple formulas (each valid for specific temperature ranges) to accurately assess degradation under varying thermal conditions, thereby improving measurement precision without requiring a single complex universal formula
Solution Approach 2:
The patent segments the degradation assessment process by dividing it into multiple determination formulas, each corresponding to specific temperature conditions. This segmentation allows the system to handle different degradation rates and conditions with specialized formulas, improving accuracy while maintaining manageable system complexity through modular formula selection
2Reliability
If conventional degradation determination methods are used, then degradation can be detected, but reliability deteriorates due to premature replacement of functional components
Solution Approach 1:
The patent improves reliability by changing the assessment parameter based on temperature conditions. By selecting appropriate degradation determination formulas matched to operating temperature ranges, the system achieves more accurate degradation detection, preventing both premature replacement and failure of capacitor units
Solution Approach 2:
The patent applies dynamics by making the degradation determination process adaptive to changing temperature conditions. The controller dynamically selects the appropriate formula based on current temperature, allowing accurate degradation assessment across varying operational environments, thereby extending reliable usage of capacitor units
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
The solution enables precise degradation assessment, preventing unnecessary replacements and allowing the capacitor units to be used until the end of their actual life, thereby enhancing the reliability and efficiency of emergency power supplies for electronic braking systems.
Implementation Method 1
a temperature sensor provided near the capacitor unit detect the temperature in the vicinity of the capacitor unit
Implementation Method 2
a capacitor unit including a plurality of capacitors storing auxiliary power
Implementation Method 3
a charge circuit charges electric power to the capacitor unit
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A vehicle power supply device has a capacitor unit including capacitors storing auxiliary power; a temperature sensor; a charge circuit; a capacitor-unit current detector; a capacitor-unit voltage detector; a controller; a storage; and a determination unit. The storage stores a correction calculation formula and degradation determination formulas. The correction calculation formula is used to perform the correction calculation of the internal resistance value and the capacitance value in accordance with the temperature in order to obtain a corrected calculated value of internal resistance and a corrected calculated value of capacitance. The degradation determination formulas correspond to the numerical ranges of the corrected calculated value of capacitance and are used to calculate an internal resistance standard value from the corrected calculated value of capacitance. The determination unit determines the degradation level of the capacitor unit based on at least one of the internal resistance standard value and the corrected calculated value of capacitance. This structure determines degradation of the vehicle power supply device more accurately than ever, so that the device can be used until the end of the actual life.