Object-Based Lane Keeping Assist With Dynamic Trigger Line Shift
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Solution Overview
Problem
Conventional lane keeping assist functions in vehicles are error-prone and lack redundancy, necessitating additional systems to enhance traffic safety, especially in autonomous operations.
Innovation Solution
An object-based lane keeping assist system that utilizes sensors to detect objects in adjacent lanes, adjusts a trigger line and default line dynamically based on these objects, and intervenes with steering to prevent unintended lane departures, leveraging existing lane keeping functions for enhanced safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional lane keeping assist function is implemented, then the vehicle can be kept in the lane, but the system is error-prone and lacks redundancy
Solution Approach 1:
The patent implements a redundant lane keeping assist system that operates in parallel with the conventional system. This backup system detects lane markings and vehicle position independently, providing a safety cushion before the primary system fails. The redundant system is activated when the primary system encounters errors or uncertainties, ensuring continuous lane keeping functionality without requiring complete system redesign.
Solution Approach 2:
The patent dynamically adjusts the trigger line position based on detected objects in adjacent lanes. When objects are detected, the trigger line is shifted to maintain safe distances, preventing false lane departure warnings. This parameter adjustment allows the system to adapt to changing traffic conditions while maintaining high reliability without increasing overall system complexity.
2Measurement precision
If the trigger line is positioned at the lane marking, then lane departure can be detected early, but false interventions occur when objects are present in adjacent lanes
Solution Approach 1:
The patent makes the trigger line dynamic by shifting its position based on object detection in adjacent lanes. When objects are detected, the trigger line is moved away from the lane marking to prevent false interventions. When no objects are present, the trigger line returns to the lane marking position for early lane departure detection. This dynamic adjustment resolves the contradiction between early detection and false intervention prevention.
Solution Approach 2:
The system continuously monitors adjacent lanes for objects and provides feedback to adjust the trigger line position. This feedback mechanism ensures that the trigger line is positioned optimally at all times - close to the lane marking when safe for early detection, and shifted away when objects are present to prevent false interventions. The feedback loop maintains measurement precision while eliminating harmful false alarms.
3Reliability
If the lane keeping assist operates continuously, then lane departure is prevented, but unnecessary interventions increase when no lane departure risk exists
Solution Approach 1:
The patent implements conditional activation of the lane keeping assist system. Instead of continuous operation, the system is activated only when the vehicle approaches the trigger line or when objects are detected in adjacent lanes. This periodic activation maintains high safety reliability by being ready when needed, while improving system efficiency by remaining inactive during normal lane keeping conditions. The system transitions between active and sleep modes based on real-time risk assessment.
Data Source
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AI summary
An object-based lane keeping assist for a vehicle (10) is disclosed. The vehicle (10) comprises a first sensor (11), a second sensor (12), and a lane keeping function. The first sensor (11) is configured to determine a relative position of the vehicle (10) with respect to a lane (51). The second sensor (12) is configured to detect a position of an object (20) in an adjacent lane (52). The lane keeping function is configured to keep the vehicle (10) around a default line (L0) in the lane (51). The lane keeping assist comprises a control unit (100) including a processor (110) and a memory (120) with stored instructions that, when executed on the processor, cause the following: to trigger a steering intervention (S1) when a distance (D) between a side (13) of the vehicle (10) and a trigger line (TL) is below a predetermined threshold indicating an unintended lane departure of the vehicle (10); to complete the steering intervention (S1), when the default travel line (L0) of the lane keeping function has been reached; and to shift (dT) the trigger line (TL) when the second sensor (12) has detected the object (20) in the adjacent lane (52).