Vehicle DTE Range Display Using Dynamic Low-High Fuel Economy Bounds
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Solution Overview
Problem
Existing DTE prediction systems for electric vehicles face accuracy issues due to fluctuations in energy consumption based on past driving patterns, leading to significant uncertainties and quality complaints, especially when future traffic conditions diverge from past information.
Innovation Solution
A system that continuously provides fuel economy guidance by determining low and high fuel economy levels, converting DTE values when they reach extreme levels, and displaying these on a vehicle's display device to guide drivers towards efficient driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DTE is estimated using past energy efficiency data, then the system can provide continuous DTE information, but prediction accuracy deteriorates when future traffic conditions differ from past patterns
Solution Approach 1:
The system dynamically adjusts the DTE estimation approach based on current driving conditions. When traffic conditions match historical patterns, it uses past energy efficiency data for continuous estimation. When conditions diverge, it switches to real-time monitoring and event-based updates, ensuring accuracy adapts to changing environments while maintaining continuous information provision.
Solution Approach 2:
The system changes the parameters used for DTE calculation based on condition matching. It transitions between using historical energy efficiency parameters and real-time event parameters, allowing the estimation method to adapt to current traffic conditions while maintaining continuous operation.
2Measurement precision
If DTE is updated whenever energy-consuming events occur, then real-time accuracy is improved, but the impact of events becomes over-represented or under-represented on the remaining driving path
Solution Approach 1:
The system applies partial updates based on event significance. Not all energy-consuming events trigger DTE updates - only those that significantly impact the remaining driving path. This prevents both over-representation (updating for minor events) and under-representation (failing to update for major events), maintaining reliable real-time accuracy.
Solution Approach 2:
The system introduces an intermediary evaluation layer between event detection and DTE update. This intermediary assesses whether an event's impact warrants a DTE update, filtering out minor fluctuations while capturing significant changes, thus maintaining both real-time accuracy and reliability.
3Loss of information
If minimum DTE and maximum DTE are provided to account for prediction uncertainty, then driver information needs are met, but the values fluctuate significantly when trained on recent driving conditions
Solution Approach 1:
The system performs preliminary condition assessment before providing MIN and MAX DTE values. It evaluates whether current driving conditions match historical patterns and adjusts the uncertainty range calculation accordingly, preventing unnecessary fluctuations while still providing comprehensive uncertainty information to drivers.
Solution Approach 2:
The system uses feedback from condition matching results to adjust MIN and MAX DTE calculations. When conditions are stable and match historical data, the uncertainty range is constrained. When conditions diverge, the system adjusts the range dynamically, maintaining stable yet informative DTE ranges that reflect actual prediction uncertainty.
Data Source
AI summary
A vehicle Distance to Empty (DTE) information providing system includes a display device that displays DTE information of a vehicle, and a controller that controls an operation of the display device, in which the controller respectively determines low fuel economies and high fuel economies for different current fuel economies to store the results in a fuel economy map, determines a current DTE value, which is a real-time DTE based on a current fuel economy, based on a current battery SOC value, determines a low DTE value and a high DTE value of the current DTE value using the fuel economy map, and displays the result on the display device, selectively converts the low DTE value and the high DTE value in a case where the current DTE value reaches the low DTE value or the high DTE value, and displays the result.