Vehicle Map Updates Using Change Thresholds by Road Section
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing map information sharing systems between in-vehicle devices and external devices are inefficient due to unnecessary updates when the content of map information is similar, leading to wastage of resources and reduced accuracy in driving support control.
Innovation Solution
A map information system that includes an in-vehicle device, an external device, and an update determination device, which calculates the change degree between map information and external map information for each area, prohibiting updates where the change is below a threshold and permitting updates where the change exceeds the threshold, thereby optimizing update processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If map information is always updated between in-vehicle device and external device, then map information accuracy is maintained, but communication efficiency and resource utilization deteriorate due to unnecessary updates when content is almost the same
Solution Approach 1:
The update determination device performs preliminary comparison of map information contents before executing updates. By calculating change degrees between in-vehicle map information and external map information in advance, the system determines whether updates are necessary, thereby avoiding unnecessary communication and processing operations.
Solution Approach 2:
The system applies different update strategies to different regions based on their specific characteristics. Areas with significant changes (update-permitted sections) receive update processing, while areas with minimal changes (update-prohibited sections) are excluded from updates. This localized approach optimizes resource allocation by focusing updates only where necessary.
2Reliability
If update processing is executed frequently, then map information is kept current, but processing time and computational resources are wasted on unnecessary updates
Solution Approach 1:
The system introduces a threshold parameter (first threshold) for the change degree to determine whether updates are necessary. By comparing the calculated change degree against this threshold, the system dynamically adjusts update frequency and scope, executing updates only when the change exceeds the threshold value, thereby eliminating wasteful processing time.
3Stability of the object's composition
If all map information areas are updated uniformly, then consistency is maintained, but resources are wasted on areas where content is already similar
Solution Approach 1:
The system divides map information into update-permitted sections and update-prohibited sections based on local change characteristics. Each section is evaluated independently, and updates are applied only to sections where the content difference exceeds the threshold. This localized differential update approach maintains necessary consistency while significantly reducing resource consumption compared to uniform full-area updates.
Data Source
AI summary
A map information system includes: an in-vehicle device that executes driving support control based on map information; an external device having external map information used for the driving support control; and an update determination device. The in-vehicle device further executes external update processing that updates first map information being the map information of a first area by using first external map information being the external map information of the first area. The update determination device calculates a change degree being a difference between the first map information and the first external map information, for each point or each area in the first area. The external update processing is prohibited with respect to a section in which the change degree is equal to or less than a threshold. The external update processing is permitted with respect to a section in which the change degree exceeds the threshold.