Battery Deterioration Display Using Adaptive Smoothing Thresholds
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Solution Overview
Problem
Existing battery deterioration display systems often inaccurately reflect the actual state due to smoothing processes, leading to user discomfort when discrepancies arise between displayed and actual deterioration levels.
Innovation Solution
A display system that calculates full charge capacity and determines battery deterioration based on state of charge, applying a smoothing process only after an initial deterioration period, with newer capacities given greater weight, and displaying a fixed value for new vehicles to avoid immediate discrepancies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a smoothing process is applied to full charge capacities to reduce measurement fluctuations, then the displayed degree of deterioration becomes more stable and user comfort improves, but the accuracy of the displayed deterioration degree deviates from the actual deterioration degree
Solution Approach 1:
The patent divides the display area into multiple regions based on the rate of change of full charge capacities. The first region displays smoothed values to ensure stability and user comfort, while the second region displays unsmoothed values to maintain accuracy when deterioration changes rapidly. This spatial segmentation allows both contradictory requirements to be satisfied in different areas.
Solution Approach 2:
The patent dynamically adjusts the smoothing application based on the rate of change of full charge capacities. When the rate of change exceeds a threshold, the system switches to displaying unsmoothed values; when it remains below the threshold, smoothed values are displayed. This dynamic adaptation resolves the contradiction by adjusting the processing level according to actual conditions.
2Stability of the object's composition
If the smoothing process is applied to all areas, then measurement-induced fluctuations are reduced, but the initial rapid deterioration is not accurately reflected
Solution Approach 1:
The patent applies different processing qualities to different regions: the first region (where rate of change is below threshold) receives smoothing processing for stability, while the second region (where rate of change exceeds threshold) receives no smoothing to preserve accuracy. This local differentiation resolves the contradiction between stability and accuracy.
3Measurement precision
If the degree of deterioration is displayed immediately without smoothing, then accurate real-time information is provided, but measurement errors cause fluctuations that make users feel uncomfortable
Solution Approach 1:
The system continuously monitors the rate of change of full charge capacities and uses this feedback to determine whether to apply smoothing or display unsmoothed values. This feedback mechanism allows the system to adapt to actual deterioration patterns, providing real-time accuracy when needed and user comfort when measurement fluctuations occur.
Data Source
AI summary
A display system includes an instrument panel, and an ECU controlling the instrument panel. The ECU repeatedly calculates a full charge capacity of a battery by using an amount of change in state of charge (SOC) of the battery and an amount of electricity charged into or discharged from the battery and, based on the full charge capacities calculated, determines a capacity retention ratio (degree of deterioration) to be displayed on the instrument panel. The ECU controls the instrument panel such that the capacity retention ratio determined through a smoothing process performed on the full charge capacities is displayed in an area where the rate of change of the full charge capacities is less than a predetermined value, and such that the capacity retention ratio not subjected to the smoothing process is displayed in an area where the rate of change is more than the predetermined value.