Vehicle Drive Assist Lane Departure Threshold Adjustment
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Solution Overview
Problem
Existing vehicle drive assist systems frequently activate lane departure warnings or controls when a lane line is covered in snow, leading to driver annoyance due to insufficient threshold adjustments, even when the driver recognizes the lane departure direction.
Innovation Solution
A vehicle drive assist system that includes a lane line recognizing unit and a drive assist unit, which mitigates the lane departure determination threshold for the recognized lane line when one side is covered in unmelted snow, setting the threshold based on the relative position to the inner edge of the snow-covered lane line rather than the original lane line, thereby reducing unnecessary warnings and controls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive assist system uses a fixed lane departure determination threshold based on the recognized lane line, then the system maintains consistent safety standards, but the driver experiences frequent unnecessary warnings when snow covers one side of the road
Solution Approach 1:
The lane departure determination threshold is made dynamic by adjusting it based on the presence of snow on the road. When snow is detected on one side, the threshold is offset toward the snow-covered side, allowing the vehicle to travel closer to the lane line without triggering false warnings. This dynamic adjustment resolves the contradiction by maintaining warning accuracy for actual lane departures while preventing unnecessary warnings in snowy conditions.
Solution Approach 2:
The system changes the parameter of the lane departure determination threshold based on road conditions. By detecting snow coverage and adjusting the threshold position accordingly, the system adapts to environmental changes. This parameter change allows the vehicle to maintain a safer distance from the center line while avoiding false lane departure warnings, thus improving driver comfort without sacrificing safety.
2Adaptability or versatility
If the drive assist system offsets the lane departure determination threshold by a predetermined correction amount, then the system accounts for typical lane positioning variations, but the offset is insufficient when snow covers the lane line, causing frequent warnings
Solution Approach 1:
The system dynamically changes the threshold parameter based on snow detection. When snow is detected on one side of the road, the lane departure determination threshold is offset toward the snow-covered side by an appropriate amount. This parameter change ensures that the threshold accurately reflects the effective lane boundary in snowy conditions, preventing false warnings while maintaining warning accuracy for actual lane departures.
Solution Approach 2:
The system introduces an intermediary adjustment mechanism that detects snow conditions and mediates between the fixed lane line position and the dynamic vehicle position. By detecting snow coverage and adjusting the threshold accordingly, the system creates an intermediate reference that accounts for both the physical lane marking and the practical driving constraints in snowy conditions, improving both adaptability and reliability.
3Measurement precision
If the drive assist system recognizes the lane line clearly without snow, then the lane departure determination is accurate, but the driver feels annoyed when warnings are triggered unnecessarily due to snow on the other side
Solution Approach 1:
The system changes the evaluation parameter for lane departure determination based on road conditions. When snow is detected on one side, the system adjusts the determination threshold to account for the reduced effective lane width. This parameter change allows the system to maintain high measurement precision for lane line recognition while adapting the warning criteria to match actual driving conditions, thereby improving driver satisfaction without sacrificing recognition accuracy.
Solution Approach 2:
The system segments the road surface into snow-covered and snow-free zones, and adjusts the lane departure determination accordingly. By identifying which side of the road has snow coverage, the system can apply different threshold criteria for each side, maintaining accurate lane recognition on the clear side while preventing false warnings on the snowy side, thus improving driver satisfaction.
Data Source
AI summary
A vehicle drive assist system includes: a lane line recognizing unit that recognizes left and right lane lines defining a lane along which a vehicle equipped with the drive assist system travels; and a drive assist unit that sets lane departure determination thresholds along the left and right lane lines, and performs a drive assist operation based on a relative position of the vehicle to the lane departure determination threshold. The drive assist unit sets a left lane departure determination threshold on the basis of an inner edge of unmelted snow when a left lane line of a traveling lane is recognized based on a front-view image of the vehicle, captured by the lane line recognizing unit, but a right lane line which is covered with the unmelted snow cannot be recognized.