Electric Vehicle Navigation Display for Battery Degradation
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Solution Overview
Problem
Existing navigation systems for electric vehicles do not allow drivers to visually confirm the cruising range calculated considering battery degradation.
Innovation Solution
A navigation device with a degradation coefficient determination unit, current location calculation unit, vicinity map display, cruising range calculation units, and a cruising range display unit that shows a first and second cruising range on a map, with the second range being smaller and representing battery degradation, allowing visual confirmation of the reduced range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the navigation device displays only the first cruising range calculated from remaining amount and full charge amount, then the display is simple and easy to understand, but it does not reflect the actual reduced cruising range due to battery degradation
Solution Approach 1:
The patent segments the cruising range information into two distinct components: the first cruising range (calculated from remaining amount and full charge amount) and the second cruising range (corrected for battery degradation). This segmentation allows the system to present both the theoretical maximum range and the realistic adjusted range, resolving the contradiction between accuracy and simplicity by providing differentiated information layers.
Solution Approach 2:
The patent applies local quality by displaying the second cruising range (degradation-corrected) specifically in the ring-shaped region between the first and second circles, while the first cruising range is shown in the inner circle. This localized differentiation allows drivers to immediately grasp the actual usable range without overwhelming them with all data simultaneously, balancing accuracy with ease of understanding.
2Reliability
If the navigation device calculates and displays the second cruising range considering battery degradation, then the cruising range information becomes more accurate and reliable, but the calculation and display processes become more complex
Solution Approach 1:
The patent implements preliminary action by pre-calculating the degradation coefficient based on battery cycle information obtained from the battery control device. This degradation coefficient is then applied to adjust the first cruising range to obtain the second cruising range. By performing this correction calculation in advance and integrating it into the existing navigation system, the patent enhances reliability without requiring a complete system redesign.
Solution Approach 2:
The patent uses the degradation coefficient as an intermediary element that bridges the gap between the theoretical full charge amount and the actual usable capacity. This coefficient, derived from battery cycle data, serves as a mediator to adjust the cruising range calculation, allowing the system to incorporate complex battery degradation factors without directly complicating the user-facing display logic.
3Loss of information
If the navigation device displays both first and second cruising ranges with visual differentiation, then drivers can easily understand the impact of battery degradation, but the display screen requires more information elements
Solution Approach 1:
The patent transitions from one-dimensional linear display to two-dimensional circular representation on the map. The first cruising range is displayed as an inner circle, while the second cruising range is shown as a ring-shaped region between the first and second circles. This dimensional transformation allows the system to convey multiple layers of information (theoretical range vs. actual range) in a visually intuitive manner that is easier to interpret at a glance.
Solution Approach 2:
The patent employs color changes to differentiate between the first and second cruising ranges. The ring-shaped region representing the second cruising range is displayed in a different color or shading than the inner circle, enabling drivers to quickly distinguish between the theoretical maximum range and the realistic adjusted range. This visual coding simplifies information interpretation while maintaining completeness.
Data Source
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AI summary
A navigation device includes: a degradation coefficient determination unit that determines a degradation coefficient representing a degradation level of a battery that supplies a vehicle with electric power for driving; a current location calculation unit that calculates a current location of the vehicle; a vicinity map display unit that displays a vicinity map showing a vicinity of the current location of the vehicle on a display screen; a cruising range calculation unit that calculates a first cruising range of the vehicle based on a remaining amount of the battery and a full charge amount of the battery, which is a charging amount when the battery is in full charge, contained in charging information received from the battery; a second cruising range calculation unit that calculates a second cruising range, which is smaller than the first cruising range, based on the degradation coefficient and the first cruising range; and a cruising range display unit that performs a predetermined display representing the second cruising range on the vicinity map.