Road Identification Using Dual Maps for Accurate Vehicle Positioning
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Solution Overview
Problem
Autonomous driving systems face challenges in accurately determining a vehicle's position on roads without pre-prepared autonomous driving maps, leading to potential erroneous control decisions when using navigation maps instead, which can result in incorrect vehicle control based on mismatched information.
Innovation Solution
A road specifying device that utilizes first map data and second map data with overlapping road data, combined with external positioning system information, to accurately estimate the vehicle's position and specify the correct road, even when autonomous driving maps are not available for all roads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If autonomous driving maps are prepared for all roads, then measurement precision of vehicle position is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent combines autonomous driving maps (first map data) and navigation maps (second map data) into a unified road specifying system. When the vehicle is on a road without autonomous driving map coverage, the system merges information from navigation maps to maintain positioning accuracy, thus resolving the contradiction between comprehensive coverage and system complexity
Solution Approach 2:
The patent introduces a road specifying device as an intermediary component that mediates between the vehicle positioning system and dual map data sources. This intermediary intelligently selects and integrates information from appropriate map sources, achieving accurate position specification without requiring complete autonomous driving map coverage of all roads
2Device complexity
If navigation maps are used instead of autonomous driving maps, then device complexity is reduced, but reliability of autonomous driving control deteriorates due to potential erroneous position decisions
Solution Approach 1:
The patent performs preliminary road identification and position estimation using both map types before autonomous driving control is activated. The road specifying device pre-determines the vehicle's location and road context, ensuring that when autonomous driving control begins, reliable position information is already available even on roads without dedicated autonomous driving maps
Solution Approach 2:
The patent implements a feedback mechanism where the road specifying device continuously monitors vehicle position using both autonomous driving maps and navigation maps, compares results, and adjusts position estimation accordingly. This feedback loop maintains control reliability by detecting and correcting potential positioning errors that might arise from using navigation maps alone
Data Source
AI summary
A problem of the present invention is to provide a road specifying device which estimates an appropriate own vehicle position even when autonomous driving maps are not prepared for all roads in a driving assisting function which can automate and assist part or all of a driving operation of a passenger, and correctly perform traveling control of the autonomous driving. The road specifying device according to the present invention specifies a road on which an own vehicle is traveling based on autonomous driving map data including road data, navigation map data including data which is the road data and whose contents partially overlaps that of the autonomous driving map data, and position information of the own vehicle whose position is measured by an external positioning system.