Round-Trip Range Calculation for Electric Vehicles
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Solution Overview
Problem
Existing technologies lack a precise method for calculating the round-trip traveling range of electric vehicles without recharging along the way, which is crucial due to the limited battery capacity and longer charging times compared to gasoline-powered vehicles.
Innovation Solution
A telematics system comprising a server and user information terminal that calculates the round-trip traveling range by integrating energy consumption data for both directions along road links on a digital map, using a processing part to determine the range an electric vehicle can travel back to its starting point without replenishing energy, employing Dijkstra algorithm for route search and considering various search conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If battery capacity is increased to extend traveling range, then the vehicle can travel farther, but the vehicle weight increases and energy efficiency decreases
Solution Approach 1:
The system performs preliminary calculation of round-trip energy consumption by tracing road links from the start point and integrating energy values in both directions before the vehicle departs. This allows the driver to plan the route and understand energy requirements in advance, eliminating the need to carry excess battery capacity for uncertainty.
Solution Approach 2:
The navigation apparatus uses the vehicle's own remaining battery amount and real-time position information to calculate the reachable range and determine if round-trip travel is possible. The system serves the driver by providing self-contained range calculation without requiring external charging infrastructure during the journey.
2Duration of action of moving object
If charging facilities are increased to support longer trips, then the vehicle can recharge during travel, but the infrastructure cost and complexity increase
Solution Approach 1:
The patent extracts the charging infrastructure requirement from the travel planning process by calculating whether round-trip travel is possible using only the remaining battery amount. The system separates the range calculation function from external charging facilities, allowing travel planning to be performed independently of charging infrastructure availability.
3Measurement precision
If the navigation system calculates detailed round-trip energy consumption by tracing all road links, then the accuracy of traveling range information improves, but the calculation time and processing load increase
Solution Approach 1:
The system performs preliminary integration of energy consumption values along road links from the start point in both directions before determining the final reachable range. By pre-calculating cumulative energy values at each road node, the system avoids repeated calculations and enables rapid determination of whether round-trip travel is possible.
Data Source
Figure 1
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AI summary
A storage part (21) stores beforehand, as an energy consumption graph (32), amounts of energy consumed by a vehicle traveling in both directions along road links on a map (31). A processing part (12) traces a road link from a specified start point location peripherally, calculates, for each road node (A-F), a first and second integration values obtained by integrating amounts of energy in a direction moving away from the start point location on the energy consumption graph (32) and in a direction moving toward the start point location on the energy consumption graph, and based on a relationship between the sum of the first integration value and the second integration value, and a given specified amount of energy for each road node (A-F), decides a round-trip traveling range which is a range within which the vehicle is able to return to the start point location by using the specified amount of energy.