Drive Support Apparatus Map Matching Reliability Verification
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Solution Overview
Problem
Existing drive support systems for collision prediction between vehicles often fail to provide necessary support due to position determination errors from Global Navigation Satellite System (GNSS) signals, leading to incorrect road matching and unnecessary or lacking safety alerts.
Innovation Solution
A drive support apparatus that includes a controller to determine the reliability of map matching, predict vehicle paths, and define a determination area to assess the likelihood of intersection, thereby providing suppressed or appropriate safety support based on the reliability of map matching and predicted paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If map-matching is performed to correct GNSS position, then position accuracy is improved, but matching errors occur causing wrong road identification
Solution Approach 1:
The patent introduces an intersection node verification mechanism as an intermediary check between map-matching and collision determination. Instead of directly using map-matched positions for collision assessment, the system verifies whether the vehicle is approaching a real intersection node on the map, using this verification as a mediator to filter out false collision alerts caused by map-matching errors.
Solution Approach 2:
The system performs preliminary verification of intersection nodes before determining collision risk. By checking in advance whether the vehicle's predicted path actually leads to a valid intersection node on the map, the system prevents false collision determinations that would occur if map-matching errors led to incorrect intersection detection.
2Reliability
If map-matching is not performed, then road identification reliability is maintained, but position accuracy deteriorates leading to wrong collision predictions
Solution Approach 1:
The patent segments the position determination process into two independent components: GNSS-based raw position measurement and map-based intersection node verification. This segmentation allows the system to use GNSS positions for general location tracking while separately verifying collision-relevant positions against actual map intersection nodes, preventing errors from propagating between stages.
3Difficulty of detecting and measuring
If drive support is provided based on predicted path intersection, then collision detection capability is improved, but false alerts increase due to position errors
Solution Approach 1:
The system implements feedback by continuously monitoring whether the vehicle is approaching a verified intersection node and adjusting collision alert generation accordingly. When the vehicle is confirmed to be approaching a valid intersection node, collision detection is activated; when map-matching errors are detected or no valid intersection node is found, alert generation is suppressed, preventing false positives.
4Object-generated harmful factors
If drive support is suppressed without intersection node verification, then false alerts are reduced, but necessary safety support may be missed
Solution Approach 1:
The system dynamically adjusts the level of drive support based on verification results. When intersection nodes are verified, full collision detection and alert functions are activated. When verification fails or map-matching reliability is low, the system dynamically suppresses alert generation. This dynamic adjustment ensures safety support is provided when needed while avoiding false alerts, maintaining reliability across different operating conditions.
Data Source
AI summary
A drive support apparatus includes: a reliability determiner determining a reliability of a map matching, an area definer defining a determination area to include a cross point between a self-vehicle predicted path and a nearby vehicle predicted path, an intersection node finder determining an intersection node in a travel direction of the self-vehicle based on a high map matching reliability, and a node determiner determining whether the intersection node is found in the determination area. When no intersection node is found in the determination area, a drive support level is suppressed, and when the reliability is low, drive support is provided depending on whether the cross point between the self-vehicle predicted path and the other vehicle predicted path is found. Thus, lack of the drive support in a support-required situation is prevented, while preventing a provision of an unnecessary drive support.