Battery DTE Display Using Speed Limit and Instantaneous Speed
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Solution Overview
Problem
Electric vehicles face challenges in accurately predicting distance to empty (DTE) due to increased energy consumption with vehicle speed, making it difficult to provide consumers with reliable DTE information, especially at high speeds.
Innovation Solution
A battery information guide device equipped with a processor that displays three types of DTE information: based on official fuel efficiency, speed limit, and instantaneous vehicle speed, using a battery management system and navigation system to determine DTE through equations and fuel efficiency data, ensuring accurate and situation-specific DTE notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If DTE is predicted based on official fuel efficiency, then the prediction is simple and consistent with certification standards, but the accuracy deteriorates at high vehicle speeds due to increased energy consumption
Solution Approach 1:
The patent segments the DTE prediction into multiple scenarios: first DTE based on official fuel efficiency for general reference, second DTE based on speed limit for highway conditions, and third DTE based on instantaneous vehicle speed for real-time accuracy. This segmentation allows each prediction method to be applied in its appropriate context, resolving the contradiction between simplicity and accuracy.
Solution Approach 2:
The system dynamically switches between different DTE prediction methods based on current driving conditions. When vehicle speed exceeds the speed limit, the system transitions from using official fuel efficiency (first DTE) to using instantaneous vehicle speed (third DTE), making the prediction system adaptive to changing conditions and maintaining accuracy across different operating ranges.
2Measurement precision
If DTE is predicted using instantaneous vehicle speed, then the accuracy improves for current driving conditions, but the system complexity increases due to additional sensors and processing
Solution Approach 1:
The patent leverages existing multi-functional components in the vehicle: the navigation system's speed limit database serves dual purposes for both legal compliance and DTE prediction, while the vehicle speed sensor used for cruise control now also provides data for instantaneous DTE calculation. This multi-functionality reduces the need for additional dedicated components, mitigating the complexity increase.
Solution Approach 2:
The system uses already-collected data from existing vehicle systems (speed limit information from navigation, vehicle speed from propulsion control) to generate the third DTE prediction without requiring separate measurement systems. The vehicle's existing infrastructure serves the additional function of accurate DTE prediction, avoiding the complexity of building new dedicated systems.
3Adaptability or versatility
If multiple DTE values are displayed to provide comprehensive information, then the usefulness to drivers improves, but the information overload may confuse the driver
Solution Approach 1:
The patent applies local quality by giving each DTE value a distinct visual identity and contextual label: first DTE is presented as official certification data, second DTE as speed-limit-based prediction, and third DTE as real-time actual prediction. Each presentation style is optimized for its specific purpose, allowing drivers to quickly distinguish between different types of information without confusion.
Solution Approach 2:
The system segments the DTE information display by condition: it shows only the relevant DTE values based on current driving context (e.g., showing third DTE when vehicle speed exceeds speed limit, showing second DTE when approaching speed limits). This conditional segmentation prevents information overload by displaying only the most relevant predictions at any given moment.
Data Source
AI summary
A battery information guide device and a method therefor include a display and at least one processor electrically connected to the display. The at least one processor is configured to display information related to a first distance to empty (DTE) on the display based on official fuel efficiency and a state of charge (SOC), receives information related to a speed limit on a road, when the at least one processor concludes that a vehicle enters the road, displays information related to a second DTE expected when the vehicle travels at the speed limit on the display, and displays information related to a third DTE determined based on an instantaneous vehicle speed of the vehicle, when a vehicle speed of the vehicle is greater than the speed limit.