Collision Position Prediction Using Road Shape Vector Fixing
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Solution Overview
Problem
Existing collision position predicting devices face challenges in accurately predicting the collision position between a moving object and a subject vehicle due to variations in the moving object's direction and errors in position information detected by sensors, leading to inaccurate calculations of moving vectors.
Innovation Solution
The device sets the direction of the moving vector based on the shape of the road or pedestrian crossing when the subject vehicle turns, decomposing the vector into road and vertical components to enhance prediction accuracy, even for objects moving in a staggering or fluctuating manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the moving vector is calculated based on successive position information, then the moving direction can be obtained, but the direction varies due to staggering or fluctuating movement, reducing prediction accuracy
Solution Approach 1:
The patent extracts only the necessary component of the moving vector (the component perpendicular to the subject vehicle's movement direction) for collision position prediction, discarding the varying parallel component that causes instability. This selective extraction resolves the contradiction by using only the stable, relevant directional information.
Solution Approach 2:
The patent transforms the moving vector calculation by changing the reference parameter from the object's absolute movement direction to the direction relative to the subject vehicle's movement. This parameter change stabilizes the moving vector direction by eliminating variations caused by the object's staggering movement.
2Measurement precision
If position information is detected by sensors, then the moving object's position can be obtained, but errors occur in position information and moving vector direction, reducing prediction accuracy
Solution Approach 1:
The patent introduces the subject vehicle's movement direction as an intermediary reference frame. By calculating the moving vector relative to this stable reference rather than using absolute sensor positions directly, the system reduces the impact of sensor errors on the final collision position prediction.
3Measurement precision
If the moving vector direction is fixed based on road shape, then collision position prediction accuracy is improved, but the system complexity increases
Solution Approach 1:
Instead of tracking the moving object's complex actual movement path to determine vector direction, the patent inverts the approach by using the subject vehicle's known movement direction (derived from road shape or vehicle orientation) as the fixed reference. This simplifies the system while maintaining prediction accuracy.
Data Source
AI summary
The present invention is intended to provide a technique which is capable of detecting a collision position of a moving object crossing a road and a subject vehicle with a higher degree of accuracy. In the present invention, in cases where the moving object crossing the road into which the subject vehicle has entered is detected at the time when the subject vehicle has turned to the right or to the left, the direction of a moving vector of the moving object is fixed to a direction which is set based on a shape of the road into which the subject vehicle has turned to the right or to the left. Then, the collision position of the moving object and the subject vehicle is predicted based on this moving vector of which the direction is fixed.