Preceding Vehicle Selection Using Width-Based Lateral Correction
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Solution Overview
Problem
Existing inter-vehicle control systems face errors in selecting a preceding vehicle due to inaccurate lateral position and width information, leading to erroneous vehicle selection, especially at long distances and on curved roads.
Innovation Solution
The system includes object detecting means, lateral position correcting means, own vehicle lane probability calculating means, and correction amount adjusting means to accurately determine the lateral position of objects using width information and adjust correction amounts based on correlated parameters, ensuring early and accurate selection of a preceding vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If end portion position information is used to select preceding vehicle, then determination can be made earlier, but erroneous selection easily occurs at long distances and on curved roads
Solution Approach 1:
The patent changes the parameter used for position determination from specific position information to end portion position information, which enables earlier determination. However, it also introduces a verification mechanism that checks whether the determined position is appropriate for the given distance and curvature conditions, thereby maintaining reliability while achieving earlier determination.
2Measurement precision
If specific position information from radar is used, then position can be detected, but accuracy decreases at long distances and on curved roads
Solution Approach 1:
The patent introduces end portion position information as an intermediary that bridges the gap between radar detection and accurate position determination. This intermediary element helps compensate for the loss of accuracy that occurs with distance and curvature by providing a more reliable reference point for vehicle position.
3Measurement precision
If width information is used to correct lateral position, then determination accuracy can be improved, but error increases on curved roads
Solution Approach 1:
The patent applies local quality by making the correction approach adaptive to local conditions. It uses end portion position information which is particularly effective for determining whether vehicles are in the same lane, while incorporating verification mechanisms that account for curved road conditions, thereby applying correction locally where it is most beneficial without introducing systematic errors.
Data Source
AI summary
In a preceding vehicle selection apparatus, for each object ahead, a relative position, a relative speed, and width information indicating a lateral width are determined. A lateral position of the object ahead with reference to a traveling direction of the own vehicle is corrected by using the width information of the object ahead. Based on the relative position of the object ahead of, which the lateral position has been corrected, an own vehicle lane probability is calculated for each object ahead. A preceding vehicle is selected from the objects ahead based on the calculated own vehicle lane probability. Based on a value of a correlated parameter that has correlation with error in the lateral position or error in the width information, a correction amount of the lateral position is reduced as error in the lateral position or error in the width information becomes large.