Lane Departure Avoidance Steering Control Stability
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Solution Overview
Problem
Lane departure avoidance systems face instability in steering control due to unreliable recognition of lane marking lines, especially under poor road conditions or when lane marking lines are light-colored, leading to unstable steering.
Innovation Solution
A lane departure avoidance system that calculates variations in the vehicle's lateral position, yaw angle, lane curvature, and pitch angle relative to recognized lane marking lines, and uses these calculations to determine if the recognized results are unstable, thereby disabling or terminating steering control when thresholds are exceeded to prevent instability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lane departure avoidance system performs steering control based on recognized lane marking lines, then the vehicle can avoid departing from the lane, but the steering control becomes unstable when lane marking lines are light-colored or road conditions are poor
Solution Approach 1:
The system performs preliminary actions by calculating variations in lateral position, yaw angle, lane curvature, and pitch angle before executing steering control. These pre-calculations allow the system to assess the reliability of lane marking recognition in advance, preventing unstable steering control when recognition accuracy is poor.
Solution Approach 2:
The system continuously monitors variations in vehicle state parameters (lateral position, yaw angle, curvature, pitch angle) and uses this feedback to determine whether to execute or terminate steering control. When variations exceed thresholds indicating unreliable recognition, the system terminates control, thereby maintaining steering stability under poor road conditions or with light-colored lane markings.
2Reliability
If the system continuously monitors vehicle state variations to ensure stable steering control, then steering stability is maintained, but the system complexity increases
Solution Approach 1:
The system segments the monitoring task into four distinct variation parameters: lateral position variation, yaw angle variation, lane curvature variation, and pitch angle variation. Each parameter is independently calculated and compared against its own threshold, allowing for modular and manageable complexity while comprehensively assessing steering stability.
Data Source
AI summary
A lane departure avoidance system disables start of steering control or terminate running steering control upon determination that a value of a at least one selected variation, which is selected from a first variation, a second variation, a third variation, and a fourth variation, is equal to or more than a corresponding threshold. The first variation is a variation of a lateral position of an own vehicle relative to lane marking lines recognized by a recognition unit, and the second variation is a variation of a yaw angle of the own vehicle relative to the recognized lane marking lines. The third variation is a variation of a curvature of the recognized lane marking lines, and the fourth variation is a variation of a pitch angle of the own vehicle.