Rear Warning Area Adjustment Using Trajectory Curvature
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Solution Overview
Problem
Existing driving assistance systems inaccurately determine when a vehicle is making a turn, leading to inappropriate setting or narrowing of warning areas, and do not account for the vehicle's speed or position relative to the lane center during turns, potentially causing false notifications.
Innovation Solution
A driving assistance system that uses radar and imaging devices to detect objects around the vehicle, calculates an 'area reliable distance' based on the vehicle's trajectory curvature, and adjusts warning areas dynamically to ensure accurate detection and notification based on the vehicle's position and trajectory reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the warning area is narrowed when the host vehicle makes a turn at an intersection, then false notifications are reduced, but the warning area may become too small to detect objects that actually pose a risk
Solution Approach 1:
The warning area is dynamically adjusted based on the host vehicle's turning state. When a turn is detected, the warning area is narrowed; when the turn is completed, the warning area is expanded back to its original size. This dynamic adjustment resolves the contradiction by making the warning area size adaptive to the vehicle's operational context.
Solution Approach 2:
The system changes the geometric parameters of the warning area (specifically its size and shape) based on the vehicle's turning status. By modifying the area parameters in response to detected turning maneuvers, the system maintains notification accuracy while adapting to changing spatial requirements.
2Measurement precision
If the warning area is expanded to ensure all potential objects are detected, then detection coverage is improved, but false notifications increase when the vehicle is turning
Solution Approach 1:
The warning area undergoes dynamic size changes based on the vehicle's turning state. During turns, the area is reduced to eliminate false notifications from objects in the turning path. During straight driving, the area is expanded to maximize detection coverage. This dynamic behavior resolves the contradiction between coverage and false alarms.
Solution Approach 2:
The warning area applies different spatial coverage qualities at different times. When turning, the area quality is reduced in the direction of the turn to avoid false notifications. When not turning, the area quality is maximized for comprehensive detection. This local quality adjustment resolves the contradiction.
3Reliability
If the warning area is narrowed during turns to reduce false notifications, then notification reliability improves, but detection coverage in the turning path is reduced
Solution Approach 1:
The warning area is dynamically adjusted based on the vehicle's turning state. When a turn is detected, the warning area is narrowed to improve notification reliability by excluding objects that are part of the normal turning path. When the turn is completed, the area is expanded again. This dynamic adjustment resolves the contradiction between reliability and coverage.
Data Source
AI summary
A driving assistance device includes: an object detecting part that detects an object behind and/or to the left and/or right rear of a host vehicle; an area setting part that sets a warning area behind and/or to the left or right rear of the host vehicle; a notification part that issues a notification when an object is detected within the warning area by the object detecting part; and an area changing part that calculates, based on a variation in curvature of a traveling trajectory of the host vehicle, an area reliable distance defining an area with high reliability, based on the area reliable distance, sets a reference position, and based on a lateral line extending in a turning radius direction of the host vehicle at the reference position, changes a rear end of the warning area.