Dynamic Lane Departure Avoidance System for Variable Shoulder Widths
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Solution Overview
Problem
Conventional lane departure prevention systems trigger unnecessary alarms and discomfort for drivers on roads with varying shoulder widths, as they incorrectly interpret intentional movements towards the outer line due to wide shoulder widths, leading to inappropriate traveling assistance.
Innovation Solution
A lane departure avoidance system that includes a shoulder width calculation unit and an assist implementation unit, which sets a forbidden position closer to the road edge for wide shoulder widths and an assist start position closer to the outer line for narrow shoulder widths, using an in-vehicle camera to recognize road edges and outer lines, and implements traveling assistance to prevent vehicles from crossing these positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed determination line is provided inside the lane for lane departure prevention, then the alarm process can be performed promptly for vehicles moving out of the lane, but unnecessary alarms are triggered on roads with wide shoulder widths causing driver discomfort
Solution Approach 1:
The determination line is made dynamic by adjusting its position based on the detected shoulder width. The system calculates the actual shoulder width from road edge detection and outer line recognition, then dynamically positions the determination line at an appropriate distance from the outer line. This resolves the contradiction by making the alarm trigger point adaptable to different road conditions, preventing unnecessary alarms on wide-shoulder roads while maintaining prompt alarm response on narrow-shoulder roads.
Solution Approach 2:
The system changes the positional parameter of the determination line based on the shoulder width parameter. By detecting the shoulder width and adjusting the determination line position accordingly, the system optimizes the alarm trigger point for each specific road condition. This parameter adjustment resolves the contradiction between reliable lane departure detection and driver comfort by adapting the system behavior to the actual road geometry.
2Reliability
If the determination line is positioned closer to the outer line for narrow shoulder widths, then lane departure prevention is more effective, but the alarm may trigger too early on roads with wide shoulder widths
Solution Approach 1:
The determination line position is dynamically adjusted based on the detected shoulder width. On narrow-shoulder roads, the line is positioned closer to the outer line for earlier and more effective prevention. On wide-shoulder roads, the line is positioned farther from the outer line to avoid premature alarms. This dynamic positioning resolves the contradiction between prevention effectiveness and alarm timing accuracy.
Solution Approach 2:
The system changes the positional parameter of the determination line in response to variations in shoulder width parameter. By detecting and responding to shoulder width changes, the system optimizes both the effectiveness of lane departure prevention and the timing accuracy of alarm triggers for different road conditions.
Data Source
AI summary
A lane departure avoidance system includes: a recognition unit that recognizes a road edge of the road, and recognizes an outer line as a dividing line drawn on a road-edge side of a lane closest to the road edge; and an assist implementation unit that provides, within an area including the lane closest to the road edge and extending to the road edge, a forbidden position over which a vehicle is forbidden from going toward the road edge, and implements traveling assistance such that the vehicle does not go over the forbidden position. The system includes a shoulder width calculation unit that calculates, as a shoulder width, a width from the outer line to the road edge. The wider the shoulder width calculated by the shoulder width calculation unit is, the closer the forbidden position is set to the road edge by the assist implementation unit.