Collision Risk Map Adjustment for Vehicle Obstacle Turning
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Solution Overview
Problem
Existing collision risk calculation devices inaccurately estimate collision risk due to uniform risk map settings based on relative speed, leading to unnecessary avoidance actions or sudden braking, as they fail to account for the obstacle's possibility of turning left or right.
Innovation Solution
A collision risk calculation device that adjusts the risk map's range in left and right directions relative to the obstacle's speed, incorporating movement direction and prediction vectors to reflect the obstacle's likelihood of turning, thereby providing a more accurate risk assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the range of the risk map is uniformly increased when the speed of the front obstacle is lower than the speed of the own vehicle, then the collision risk estimation covers more potential danger zones, but unnecessary avoidance actions and sudden braking occur due to overestimation of turning possibility
Solution Approach 1:
The patent applies local quality by differentiating the risk map range adjustment based on the obstacle's speed characteristics. Instead of uniformly increasing the risk map range for all slow-moving obstacles, the system selectively adjusts the range only in directions where the obstacle is likely to turn (based on its speed being below a predetermined threshold). This localized adjustment improves collision risk estimation accuracy without causing unnecessary avoidance actions in directions where the obstacle is unlikely to turn.
2Reliability
If the range of the risk map is uniformly decreased when the speed of the front obstacle is higher than the speed of the own vehicle, then the false alarms are reduced, but the risk map fails to account for obstacles that may still turn at high speeds
Solution Approach 1:
The patent implements dynamics by making the risk map range adjustable and adaptive based on the obstacle's speed. The system dynamically determines whether to increase or maintain the risk map range by comparing the obstacle's speed with a predetermined threshold. This dynamic adjustment allows the risk map to adapt to different obstacle behaviors - covering potential turning zones for slow-moving obstacles while maintaining appropriate range for high-speed obstacles, thus resolving the contradiction between accuracy and adaptability.
3Reliability
If the risk map range is set large to cover all possible obstacle movements, then collision risk is thoroughly assessed, but the own vehicle performs excessive avoidance maneuvers and sudden braking
Solution Approach 1:
The patent applies parameter changes by modifying the risk map range parameter based on the obstacle's speed parameter. The system changes the spatial extent of the risk map from a uniform large range to a selectively adjusted range that considers the obstacle's speed characteristics. This parameter adjustment allows thorough safety assessment for obstacles that may turn (slow-moving) while maintaining travel efficiency by reducing the risk map range for obstacles unlikely to turn (high-speed), thus resolving the contradiction between safety thoroughness and travel efficiency.
Data Source
AI summary
A collision risk calculation device includes: a movement information obtaining unit that obtains a speed and a movement direction of an obstacle; and a risk map generator that generates a risk map indicating a range within which the obstacle can exist after one unit of time and degree of risk of collision of an own vehicle with the obstacle within the range, on a basis of the speed and the movement direction of the obstacle obtained by the movement information obtaining unit, wherein the risk map generator changes the range in left and right directions with respect to a traveling direction of the obstacle, on a basis of the speed of the obstacle in the traveling direction.