Forward Collision Braking Using Virtual Path Intersection
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Solution Overview
Problem
Conventional forward collision-avoidance assist (FCA) systems in vehicles fail to operate normally on roads without lane lines and can initiate unnecessary braking due to reliance on estimated time of collision without considering lane line information.
Innovation Solution
A vehicle control method using a camera and radar to detect lane lines and objects, calculating indices for traveling straightness and collision possibility, and controlling the braking system based on these indices to prevent sensitive control and ensure proper FCA function operation even without lane lines, by determining the vehicle's and object's straightness and collision likelihood through virtual path intersection and lateral overlap analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the FCA function operates based only on estimated time of collision without lane line information, then the system can detect objects in all road conditions, but the system initiates unnecessary braking on roads without lane lines
Solution Approach 1:
The system changes the evaluation parameters for collision risk by detecting traveling straightness of both the host vehicle and target object, and calculating virtual path intersections. When lane lines are absent, the system uses alternative parameters (traveling straightness indices, virtual path overlap) to determine collision likelihood, enabling reliable braking control across all road conditions without false positives.
2Reliability
If the FCA function requires lane line detection for accurate collision assessment, then unnecessary braking is prevented, but the system cannot operate on roads without lane lines
Solution Approach 1:
The system introduces virtual paths as an intermediary concept to represent vehicle and object trajectories when lane lines are absent. By calculating intersections between virtual paths and assessing traveling straightness, the system creates a substitute mechanism for lane line-based collision assessment, enabling reliable FCA operation on both marked and unmarked roads.
3Reliability
If the system calculates multiple indices for traveling straightness and collision possibility, then false positive braking is reduced, but the system complexity increases
Solution Approach 1:
The system segments the collision assessment process into distinct evaluation stages: detecting traveling straightness of the host vehicle, detecting traveling straightness of the target object, calculating virtual path intersections, and evaluating collision possibility indices. This segmented approach manages complexity by breaking down the overall assessment into manageable, sequential steps with clear decision points.
Data Source
AI summary
A vehicle includes a camera configured to capture an outside of the vehicle, a radar configured to detect an object outside the vehicle, and a controller configured to acquire a virtual path of the vehicle based on image data output from the camera and radar data output from the radar and perform forward collision-avoidance braking based on maintaining a time in which the object intersects the virtual path of the vehicle.