Collision Risk Assessment Using Segmented Spatial Detection
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Solution Overview
Problem
Conventional collision possibility determination devices preferentially assess obstacles closer to the center of a vehicle's width direction, potentially missing higher collision risks from objects farther away but closer in the traveling direction, such as vehicles approaching from the side.
Innovation Solution
A collision possibility determination device that assesses the risk based on the space between a moving body and an object in both the traveling and width directions, with a focus on objects closer in the traveling direction, using radar and imaging to select determination targets and adjust criteria based on speed and relative movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If collision possibility is preferentially determined for obstacles closer to the center portion in the width direction, then determination accuracy for central obstacles is improved, but collision risk from obstacles at distance from center portion may be missed
Solution Approach 1:
The detection area is segmented into multiple regions based on distance from the center portion in the width direction. A first detection area closer to the center and a second detection area farther from the center. Different determination methods are applied to each segment: for objects in the first detection area, collision possibility is determined based on both traveling direction distance and width direction distance; for objects in the second detection area, only traveling direction distance is considered. This segmentation resolves the contradiction by appropriately weighting spatial factors for different object positions.
Solution Approach 2:
Different determination criteria are applied locally depending on the object's position relative to the center. Objects closer to the center use a dual-parameter assessment (traveling direction + width direction), while objects farther from the center use a single-parameter assessment (traveling direction only). This local quality approach ensures that the determination method matches the actual collision risk characteristics at different spatial locations.
2Measurement precision
If determination is based on both traveling direction space and width direction space, then accuracy for distant obstacles is improved, but response to near obstacles may be delayed
Solution Approach 1:
The determination method dynamically adapts based on the object's position. When an object is detected in the second detection area (farther from center), the system simplifies the determination to use only traveling direction distance, enabling faster response. When an object is in the first detection area (closer to center), the full dual-parameter assessment is applied. This dynamic adjustment of determination complexity based on spatial context resolves the time-accuracy tradeoff.
Solution Approach 2:
For objects in the second detection area, the system applies partial action by considering only the traveling direction distance rather than both traveling and width direction distances. This partial assessment is sufficient for distant objects where the object is already in a critical position, enabling rapid determination without unnecessary computational overhead from width direction analysis.
Data Source
AI summary
A collision possibility determination device includes: a detection unit which detects at least one object which moves relatively with respect to a moving body; and a determination unit which determines a collision possibility of the moving body with the object. The determination unit defines a first factor and a second factor which are spaces between the body and the object in a travelling direction and in a width direction of the body respectively. The determination unit determines the possibility based on the two factors when the object is within a farther area from the body, and the possibility based on only the first factor when the object is within a nearer area from the body.