EV Instrument Panel Battery Health Display Control
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Solution Overview
Problem
Users experience a sense of incompatibility when purchasing new vehicles equipped with secondary batteries, as the batteries deteriorate significantly between manufacturing and delivery, leading to a decreased capacity retention ratio and travelable distance, affecting the perceived value of the vehicle.
Innovation Solution
A vehicle control system that displays a maximum capacity retention ratio or travelable distance until a predetermined condition is met, such as a certain travel distance or delivery, to maintain a positive perception of the battery's condition, including the use of a display device to show a higher index of battery health initially, which can be updated based on actual measurements or travel distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the actual battery deterioration is displayed from the time of manufacturing, then the measurement precision of battery health is improved, but the user satisfaction and perceived vehicle value deteriorate due to showing degraded values at delivery
Solution Approach 1:
The system performs a preliminary action by setting the initial display value to 100% capacity retention at vehicle delivery, before the actual deterioration measurement is complete. This preliminary setting prevents the display of degraded values that would occur if measurement started immediately, thereby maintaining user satisfaction while preserving the ability to show accurate deterioration data after the vehicle is delivered.
2Reliability
If the battery capacity retention ratio is displayed as a decreasing value from manufacturing, then the reliability of information is improved, but the perceived vehicle value deteriorates due to showing deterioration before delivery
Solution Approach 1:
The system applies a preliminary action by establishing a temporary display state with 100% capacity retention value from the time of vehicle delivery until a predetermined condition is met. This preliminary display state prevents the showing of deteriorated values that would otherwise appear if the display started at manufacturing, thereby maintaining perceived vehicle value while ensuring reliable deterioration information is displayed after delivery.
3Measurement precision
If the EV travelable distance is displayed based on actual battery capacity from manufacturing, then the measurement accuracy is improved, but the user perception deteriorates due to showing reduced distance at delivery
Solution Approach 1:
The system performs a preliminary action by setting the initial EV travelable distance display value to correspond to 100% battery capacity at vehicle delivery, rather than displaying the reduced distance that would result from actual battery deterioration measurements. This preliminary setting maintains accurate measurement capability while preventing the display of reduced distance values that would negatively affect user perception at delivery.
Data Source
AI summary
A vehicle includes a battery that is mounted as a power source in the vehicle and an instrument panel that displays, to a user of the vehicle, an index (a capacity retention ratio Q or an electric vehicle (EV) travelable distance) indicating a larger value as deterioration of the battery progresses less. The instrument panel displays a maximum value of the index until a predetermined condition has been satisfied.