Vehicle Electricity Storage Device with Universal Threshold Selection
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Solution Overview
Problem
Existing vehicle electricity storage devices for electronically controlled brake systems require dedicated units for each automobile model or manufacturer, leading to reduced productivity due to differences in configuration and requirements for charge amount and voltage.
Innovation Solution
A vehicle electricity storage device with a controller that stores multiple thresholds associated with identification information for different electronically controlled systems, allowing it to determine the deterioration state of the electricity storage unit, thereby ensuring compatibility and reliability without the need for dedicated units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated power supply backup unit is manufactured for each automobile model or manufacturer, then reliability and safety are secured, but productivity is declined
Solution Approach 1:
The power supply backup unit is designed with a single standardized structure that can serve multiple automobile models and manufacturers. The internal resistance limit value is set to be universally compatible with different electronically controlled brake systems, allowing one device to fulfill multiple specialized roles without sacrificing reliability or safety.
Solution Approach 2:
The invention changes the parameter of internal resistance limit value from being model-specific to being universally applicable. By setting a standardized internal resistance limit value that accounts for the worst-case scenario across all applications, the device can adapt to different automobile models without requiring dedicated units for each, thus maintaining reliability while improving productivity.
2Productivity
If the internal resistance limit value is set to accommodate all automobile models, then productivity is improved, but measurement precision for deterioration state determination may be reduced
Solution Approach 1:
The internal resistance limit value is preliminarily set to a conservative threshold that prevents deterioration from affecting any automobile model. By establishing this limit value in advance based on the most stringent requirements, the device can universally serve all models while maintaining adequate precision for deterioration detection, as the limit is set before actual deterioration occurs.
Solution Approach 2:
The invention incorporates a safety margin by setting the internal resistance limit value lower than the actual threshold at which deterioration would affect any specific automobile model. This beforehand cushioning ensures that even with a universal setting, the device maintains sufficient precision to detect deterioration before it impacts reliability or safety across all applications.
Data Source
AI summary
A vehicle electricity storage device includes a capacitor unit for supplying stored electric power to an electronically controlled system, and a microcomputer including a memory. The memory stores a plurality of thresholds (internal resistance limit values) different from each other. Each of the plurality of thresholds is to be compared with an electrical characteristic value (internal resistance value) related to the capacitor unit for determining a deterioration state of the capacitor unit. The each of the plurality of thresholds is stored in association with an identification ID for identifying the electronically controlled system. The microcomputer acquires the identification ID from the electronically controlled system. And the microcomputer selects, from the plurality of thresholds, a threshold associated with the identification ID acquired. Then the microcomputer determines the deterioration state of the capacitor unit by using the electrical characteristic value and the threshold selected.