EV Range Display for Open Road and Expressway Speed Tradeoffs
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Solution Overview
Problem
Existing driver assistance systems for electric vehicles do not effectively assist drivers in selecting traveling roads and speeds to maximize cruising range, as the cruising range is dependent on traveling speed and varies between open roads and expressways.
Innovation Solution
A driver assistance system that calculates and displays open road and expressway cruising ranges, with the expressway range end point closer to the current position than the open road range, and provides speed adjustment recommendations to optimize electricity consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the vehicle travels on an expressway at higher speed, then the travel time is reduced, but the cruising range decreases due to increased electricity consumption
Solution Approach 1:
The system changes the parameter of vehicle speed to optimize electricity consumption. By detecting that the current speed exceeds the maximum efficiency speed, the system recommends reducing speed to the maximum efficiency value, thereby improving energy efficiency and extending cruising range while still achieving reasonable travel times
2Length of moving object
If the vehicle uses open roads, then the cruising range is extended, but the travel time increases
Solution Approach 1:
The system dynamically adjusts the recommended speed based on the selected road type. For expressways, it recommends the maximum efficiency speed that optimizes energy consumption. For open roads, it recommends speeds that maintain comfortable travel times while extending cruising range. This dynamic adjustment allows the system to adapt to different driving scenarios and road conditions
3Productivity
If the vehicle travels at speeds exceeding maximum efficiency speed, then the productivity is improved, but the energy efficiency deteriorates
Solution Approach 1:
The system implements feedback by continuously monitoring the current vehicle speed, comparing it with the maximum efficiency speed, and providing recommendations to the driver. When the current speed exceeds the maximum efficiency speed, the system notifies the driver to reduce speed to optimize energy consumption, creating a closed-loop control system that improves overall energy efficiency
Data Source
AI summary
A driver assistance system includes a calculation unit for calculating a cruising range as a distance at which an electric vehicle can travel with a current remaining charged amount of the electric vehicle, and an information presentation unit for displaying, on a display, a reachable range from a current position of the vehicle. The calculation unit calculates an open road cruising range in a case where an open road is used and/or an expressway cruising range in a case where an expressway is used. The information presentation unit displays an open road reach range and an expressway reach range such that an end point of the expressway reach range in a case where the expressway is used is located closer to the current position of the vehicle than an outer edge of the open road reach range in a case where the open road is used.