Vehicle Map Data Update Prioritization
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Solution Overview
Problem
Existing map data update methods in navigation systems download high accuracy map data unnecessarily, leading to increased storage space requirements and reduced usable space in vehicle storage devices, especially when the vehicle is unlikely to travel in certain regions.
Innovation Solution
A method where the map information system prioritizes updates based on the vehicle's position, route to the destination, and passage history, selectively downloading and updating block data, and deleting unused data to optimize storage space, including canceling downloads for regions the vehicle will not pass within a prescribed time period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If high accuracy map data is downloaded for all nearby regions, then the map data coverage is improved, but the storage space requirement increases
Solution Approach 1:
The map data is divided into multiple pieces of block data corresponding to different blocks on the map. The system selectively downloads and updates only the necessary block data pieces based on vehicle position, route to destination, and passage history, rather than downloading all nearby region data. This segmentation allows the system to maintain comprehensive coverage capability while reducing storage requirements by only acquiring data for actually needed regions.
Solution Approach 2:
The system applies different update strategies to different block data pieces based on their relevance to the vehicle's current and future needs. High priority is given to blocks along the current route and recently visited areas, while low or zero priority is given to blocks that are nearby but not expected to be visited. This local quality differentiation optimizes storage space by maintaining high data quality for necessary regions while eliminating redundant data.
2Reliability
If map data is downloaded based on proximity to own vehicle, then the data freshness is improved, but unnecessary data is stored
Solution Approach 1:
The system performs preliminary assessment of map data necessity before downloading by evaluating vehicle position, planned route to destination, and passage history. This preliminary action identifies which block data pieces are actually needed, allowing the system to download only those specific pieces from the map server. This prevents the download of unnecessary data while ensuring that all required data is kept fresh and up-to-date.
Solution Approach 2:
The system uses passage history as feedback to continuously refine its understanding of which map regions are necessary to maintain. By analyzing actual vehicle movement patterns, the system adjusts its data download decisions to match real usage patterns, ensuring data freshness for actually visited regions while avoiding storage of data for regions that are not part of normal vehicle operations.
3Loss of information
If all map data blocks are updated, then the data completeness is improved, but the communication load increases
Solution Approach 1:
The system extracts and downloads only the specific block data pieces that are necessary for the vehicle's current and future operations, rather than updating all map data blocks. By determining which blocks are needed based on route and passage history, the system extracts only the essential data portions from the complete map dataset, maintaining data completeness for necessary regions while minimizing communication load with the map server.
Data Source
AI summary
In an update method of map data executed by a map information system provided in a vehicle, wherein the map data includes multiple pieces of block data separated corresponding to blocks on a map and stored in a storage device of the map information system, the map information system decides priority orders of pieces of block data to be updated based on at least one of a position of an own vehicle, a route to a destination, and a passage history, communicates with a map server having a latest version of the map data and downloads update data of the pieces of block data to be updated from the map server in accordance with the priority order, and updates the pieces of block data stored in the storage device based on the downloaded update data.