Vehicle Range Estimation Using Dynamic Speed Limits
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Solution Overview
Problem
Electric vehicles face challenges due to the sparse network of recharging points and the lengthy charging process, making it inconvenient to reach destinations without sufficient energy reserves, and there is a need for improved energy management to estimate range accurately.
Innovation Solution
A method that limits driving performance parameters such as maximum velocity and acceleration before a journey, using a navigation device to detect route profiles and calculate the remaining range based on available energy, allowing for precise estimation and display of the range radius, which can be influenced by the driver through operator control elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If driving performance is limited to extend range, then energy consumption is reduced and range is extended, but driving performance and speed are reduced
Solution Approach 1:
The system dynamically adjusts driving performance parameters (maximum velocity, acceleration, comfort system performance) based on real-time energy availability and route characteristics. The computer device continuously recalculates the range radius and updates performance limits to match current energy reserves, allowing the vehicle to adapt its driving characteristics rather than being constrained by fixed limitations.
Solution Approach 2:
The invention changes multiple driving parameters simultaneously - velocity limits, acceleration limits, and comfort system performance levels - based on the calculated range radius. These parameter changes are coordinated to extend range while maintaining acceptable driving performance. The system also adjusts parameters based on route profile characteristics such as elevation changes and road gradients.
2Measurement precision
If precise range estimation is provided to help route planning, then energy management is improved, but system complexity increases due to multiple calculations and parameters
Solution Approach 1:
The navigation device is given multiple functions: it displays route information, calculates energy consumption based on route profiles, determines the range radius, and provides guidance to charging points. By making the navigation device multi-functional, the system avoids adding separate complex subsystems while still achieving precise range estimation and comprehensive energy management.
Solution Approach 2:
The system uses the vehicle's existing sensors and navigation infrastructure to gather necessary data for range calculation. The computer device automatically retrieves route profile information, calculates energy consumption, and updates the range radius without requiring external intervention or additional manual input from the driver, thereby reducing operational complexity.
3Reliability
If driving performance is limited before journey starts, then energy reserves are preserved for reaching destination, but flexibility and responsiveness during driving are reduced
Solution Approach 1:
The system continuously monitors actual energy consumption, updates the remaining energy reserves, and recalculates the range radius during the journey. This feedback loop allows the system to adjust performance limits dynamically based on actual driving conditions and consumption patterns, maintaining destination reachability while adapting to changing circumstances such as traffic conditions, weather, or driver behavior.
Solution Approach 2:
Performance limits are not fixed but dynamically adjusted based on real-time energy availability. The computer device continuously updates the maximum permissible velocity and acceleration limits according to current energy reserves and route characteristics, allowing the vehicle to maintain flexibility during the journey while ensuring the destination remains reachable.
Data Source
AI summary
A method is provided for estimating the range of a motor vehicle based on a quantity of energy carried in the motor vehicle. The method enables a driver to limit a maximum permissible velocity and/or a maximum permissible acceleration and/or a maximum performance level for a comfort system. The method also detects the route profiles surrounding the motor vehicle, in particular an altitude profile and/or a road category. A computer device calculates and displays a still possible range at least on the basis of the limitation which has been carried out, the detected route profiles and the still available quantity of energy.