Driver Assistance Junction Grade Separation Determination
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Solution Overview
Problem
Existing route guide systems inaccurately determine whether roads cross at different grades due to periodic speed fluctuations of vehicles on adjacent roads, leading to erroneous determinations of at-grade intersections.
Innovation Solution
A driver assistance system utilizing inter-vehicle communication to receive travel information, generate travel paths, calculate crossing points, and determine grade separation based on a time difference threshold, thereby accurately distinguishing between grade-separated and at-grade junctions and adjusting driver assistance accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If average speed of vehicles on multiple roads is used to determine junction type, then route guidance can be provided, but determination accuracy deteriorates due to periodic speed fluctuations from grade-separated roads
Solution Approach 1:
The patent extracts and removes the problematic third road (grade-separated road) from the determination process. By identifying that vehicles on the third road cause periodic speed fluctuations that interfere with accurate junction type determination, the system excludes this road's speed data from the calculation, thereby eliminating the source of determination errors while maintaining the ability to guide routes accurately
Solution Approach 2:
The patent implements feedback by continuously monitoring speed fluctuations and using this information to identify and exclude interfering roads. The system observes the periodic nature of speed changes, recognizes when they are caused by grade-separated roads rather than actual at-grade intersections, and adjusts its determination accordingly, creating a self-correcting determination mechanism
2Quantity of substance
If speed data from all nearby roads is included in determination, then more comprehensive data is available, but determination accuracy deteriorates due to interference from grade-separated roads
Solution Approach 1:
The patent selectively extracts and removes data from the third road (grade-separated road) from the overall data set. By identifying characteristics unique to grade-separated roads (constant speed versus periodic fluctuations), the system separates useful data from harmful data, maintaining comprehensive data collection while eliminating the specific interference that reduces determination accuracy
Solution Approach 2:
The patent applies different quality standards to different roads based on their characteristics. Roads exhibiting periodic speed fluctuations are treated differently from roads with constant speeds. The system assigns different weights or inclusion criteria to different data sources based on local road characteristics, thereby optimizing the overall determination accuracy while maintaining data comprehensiveness
Data Source
AI summary
A driver assistance system includes a travel information receiving unit configured to receive travel information on nearby vehicles using inter-vehicle communication; a travel path generation unit configured to generate a travel path of each nearby vehicle; a crossing point calculation unit configured to extract the travel paths generated and crossing each other, and to calculate a crossing point of the extracted travel paths; a grade separation determination unit configured to perform determination as to whether the crossing point is a grade-separated junction, and to determine that the crossing point is the grade-separated junction in a case where a time difference is equal to or smaller than a specified threshold, the time difference being calculated from times at which the nearby vehicles traveling on the extracted travel paths pass the crossing point; and a driver assistance changing unit configured to change driver assistance based on a result of the determination.