Lane Line Recognition Mode Switching for Turnoff Stability
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Solution Overview
Problem
Existing lane line recognition systems face challenges in accurately selecting left or right lane lines when the travel lane widens, leading to unstable driving assistance, especially at turnoffs or diverging road sections, due to reliance on scheduled road data and sensitivity to disturbance factors.
Innovation Solution
A lane line recognition apparatus that includes an imaging unit, a lane-line detector, an abnormality determiner, and a lane-line recognizer, which switches between both-side and one-side line recognition modes based on lane width abnormalities, calculating and integrating parameters to select the appropriate lane line for stable control, and informs the driver of the recognition mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both left and right lane lines are recognized along the travel lane, then the vehicle can be controlled to travel along the lane lines, but at turnoff where the cross-lane direction distance increases, the recognition accuracy deteriorates and inappropriate control occurs
Solution Approach 1:
The system dynamically switches between both-side line recognition mode and one-side line recognition mode based on the detected lane width. When the lane width exceeds a threshold (indicating a turnoff or diverging road), the system transitions from recognizing both lane lines to recognizing only one lane line, thereby adapting to changing road conditions and maintaining control accuracy.
Solution Approach 2:
The system changes the recognition parameter from dual lane line recognition to single lane line recognition based on the lane width parameter. By detecting that the cross-lane direction distance (lane width) has increased beyond a normal threshold, the system adjusts its recognition approach to select only the appropriate lane line for the current driving situation, preventing inappropriate control at turnoffs.
2Ease of operation
If the reference lane line is selected based only on the traveling-scheduled road from navigation device, then the system is simple to operate, but disturbance factors on actual roadway reduce the selection accuracy
Solution Approach 1:
The system merges multiple information sources including the traveling-scheduled road from the navigation device, actual lane line detection from the camera, and lane width analysis. By combining these diverse data sources, the system overcomes the limitations of relying solely on scheduled road data and achieves more accurate reference lane line selection even in the presence of disturbance factors on the actual roadway.
Solution Approach 2:
The system uses feedback from the detected lane width and actual lane line positions to adjust and refine the reference lane line selection. By continuously monitoring whether the detected lane width matches the expected lane width from scheduled road data, the system can identify discrepancies caused by disturbance factors and correct the reference lane line selection accordingly.
3Stability of the object's composition
If one-side line recognition mode is used at turnoff, then the vehicle control remains stable, but the driver is not informed of the mode change
Solution Approach 1:
The system provides feedback to the driver through mode information output that indicates when the system is operating in one-side line recognition mode versus both-side line recognition mode. This keeps the driver informed about the current recognition state and any limitations in lane line recognition, maintaining trust and awareness while allowing stable control to continue in the one-side mode at turnoffs.
Data Source
AI summary
In a lane line recognition apparatus, an abnormality determiner is configured to determine whether or not a width of a travel lane defined by left-side and right-side lane lines is abnormal, and a lane-line recognizer is configured to, when the width of the travel lane is not abnormal, recognize both of the left-side and right-side lane lines in a both-side line recognition mode, and when the width of the travel lane is abnormal, recognize one of the lane lines in a one-side line recognition mode. In the one-side line recognition mode, the lane-line recognizer is configured to, for each of the left-side and right-side lane lines, calculate two or more parameters of the lane line, and then integrate recognition results for the respective two or more parameters, and based on the integrated recognition results of the left-side and right-side lane lines, select one of the lane lines to be recognized.