EV SOC Display with Temperature-Based Performance Limit
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Solution Overview
Problem
Existing display systems for electric vehicles do not effectively inform users about impending decreases in traveling performance due to variations in power storage device state, such as temperature and state of charge, leading to unpredictable vehicle performance.
Innovation Solution
A display system that sets a state-of-charge (SOC) lower limit ensuring minimum traveling performance, calculates and displays the travelable distance based on this limit, and visually distinguishes the SOC range above and below this limit to alert users of potential performance decreases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the current traveling performance is displayed based on battery voltage, then the driver is notified of current performance, but the user cannot predict future decrease in traveling performance
Solution Approach 1:
The system performs preliminary action by calculating and displaying the SOC lower limit that ensures minimum traveling performance before the actual performance degradation occurs. This allows users to predict future performance decrease by monitoring whether current SOC is above or below this pre-calculated threshold, rather than waiting for performance to actually degrade.
Solution Approach 2:
The system provides beforehand cushioning by displaying warning information when SOC approaches the lower limit that ensures minimum traveling performance. This warning acts as a cushion, giving users advance notice and time to take action (such as charging) before the actual performance degradation occurs, preventing unexpected performance loss.
2Reliability
If the SOC lower limit ensuring minimum traveling performance is displayed, then users can predict performance decrease, but the display system becomes more complex
Solution Approach 1:
The display system segments the SOC display into multiple regions: a first region indicating SOC above the lower limit (normal operation zone) and a second region indicating SOC below the lower limit (warning zone). This segmentation allows the system to convey performance predictability information through simple visual region division rather than complex numerical displays or multiple indicators.
Solution Approach 2:
The system applies local quality by displaying different visual characteristics for different SOC regions. The first region (above lower limit) and second region (below lower limit) are displayed with distinct visual properties, allowing users to quickly understand performance status without complex information processing. Each region has its own visual quality tailored to its meaning.
Data Source
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AI summary
An SOC display (210) displayed on a display includes a first region (R1) and a second region (R2). The first region (R1) presents an SOC range capable of ensuring the minimum traveling performance. The SOC display (210) displays an SOC within the first region (R1). The second region (R2) presents an SOC range incapable of ensuring the minimum traveling performance. The boundary between the first region (R1) and the second region (R2) corresponds to an SOC lower limit value (SL) indicating the SOC lower limit capable of ensuring the minimum traveling performance. The SOC lower limit value (SL) is set based on the temperature of a power storage device.