Electric Vehicle DTE Calculation Excluding Air Conditioning Energy
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Solution Overview
Problem
Existing methods for calculating Distance to Empty (DTE) in electric vehicles inaccurately estimate range due to inclusion of energy consumption by air conditioning apparatus in total battery energy consumption, leading to erroneous DTE values.
Innovation Solution
A method that calculates past and current driving fuel efficiencies while accounting for air conditioning energy consumption, blending these efficiencies to exclude air conditioning energy from the DTE calculation, and reflecting current air conditioning power consumption to provide a more accurate final fuel efficiency for DTE estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If total battery energy consumption is used for DTE calculation, then calculation simplicity is maintained, but measurement precision deteriorates due to inclusion of air conditioning energy consumption
Solution Approach 1:
The patent segments total battery energy consumption into distinct components: air conditioning energy consumption and driving energy consumption. By separating these components, the system can calculate DTE using only driving energy consumption, thereby improving measurement precision while maintaining manageable calculation complexity through modular computation approaches.
Solution Approach 2:
The patent extracts air conditioning energy consumption from total battery energy consumption to isolate the driving energy consumption component. This extraction allows for more accurate DTE estimation by excluding non-driving energy usage, while the system manages the increased complexity through efficient data processing and integration of air conditioning operation data.
2Measurement precision
If air conditioning energy consumption is excluded from DTE calculation, then DTE accuracy improves, but calculation complexity increases due to additional measurements and processing required
Solution Approach 1:
The patent merges the calculation of air conditioning energy consumption with the existing battery energy consumption monitoring system. By integrating these calculations into a unified processing framework, the system achieves accurate separation of energy components without proportionally increasing measurement and processing difficulty, thus improving DTE accuracy while managing computational complexity.
Solution Approach 2:
The system uses existing air conditioning operation data and battery monitoring infrastructure to automatically calculate and separate energy consumption components. This self-service approach allows the system to extract necessary information from already-collected data, reducing the additional measurement difficulty while maintaining high DTE estimation accuracy.
Data Source
AI summary
Disclosed is a technique for calculating Distance to Empty (DTE) in an electric vehicle. In the disclosed technique, a past driving average fuel efficiency is calculated. An air conditioning average energy consumption rate during past driving is calculated. A past driving average fuel efficiency when assuming an air conditioning apparatus is not used from the past driving average fuel efficiency and the air conditioning average energy consumption rate is calculated. A current driving fuel efficiency is calculated. Then the past driving average fuel efficiency when assuming the air conditioning apparatus is not used and the current driving fuel efficiency are blended, and the DTE is calculated from the blended driving fuel efficiency.