Lane Keep Assist Virtual Line Adaptation for Encroaching Vehicles
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Solution Overview
Problem
Existing lane keep assist devices do not consider the relative positional relationship between a host vehicle and other vehicles, which can lead to safety threats when other vehicles encroach on the host vehicle's lane to avoid obstacles, potentially causing the host vehicle to depart from its intended lane.
Innovation Solution
A lane keep assist device that detects nearby vehicles and sets a virtual line at a predetermined distance from their lateral side to redefine the lane, allowing the system to perform lane keep assist control while considering the relative positional relationship with other vehicles, adjusting the virtual line based on vehicle speed and direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lane is specified based on the lane line when another vehicle is present, then the lane keep assist control can be performed according to the road marking, but the host vehicle may be forced to depart from its intended path when another vehicle encroaches on the lane to avoid obstacles
Solution Approach 1:
The patent applies dynamics by making the lane specification adaptive rather than static. When another vehicle is detected within a predetermined distance, the system dynamically switches from using the lane line as the virtual line to using a modified virtual line positioned at a safe distance from the other vehicle. This allows the lane keep assist control to adapt to changing traffic conditions and prevent the host vehicle from being forced into unsafe positions.
Solution Approach 2:
The patent introduces an intermediary element (the modified virtual line) that mediates between the lane line and the other vehicle. Instead of directly using the lane line when another vehicle is present, the system creates a buffer zone by positioning the virtual line at a predetermined distance from the other vehicle. This intermediary virtual line prevents direct conflict between the host vehicle and the encroaching vehicle while maintaining lane keep assist functionality.
2Measurement precision
If the virtual line is set close to the lane line to maintain precise lane keeping, then the lane keep assist performance is optimized, but the safety margin when other vehicles approach is reduced
Solution Approach 1:
The system dynamically adjusts the virtual line position based on the presence and distance of other vehicles. When no other vehicle is detected, the virtual line coincides with the lane line for precise lane keeping. When another vehicle is detected within a predetermined distance, the virtual line is dynamically repositioned to maintain a safe distance from the other vehicle, prioritizing safety over precise lane alignment.
Solution Approach 2:
The patent changes the positional parameter of the virtual line based on detection results. The virtual line position is not fixed but varies depending on the distance to other vehicles. This parameter change allows the system to optimize both lane keeping precision and safety margin by adjusting the virtual line position according to real-time traffic conditions.
Data Source
AI summary
A lane keep assist device is configured to perform lane keep assist control for making a host vehicle travel along a lane, and preventing the host vehicle from departing from the lane. The lane keep assist device includes an electronic control device configured to detect presence or absence of another vehicle, present in a vicinity of the host vehicle, which have a gradual decrease in a distance from the host vehicle, and when the other vehicle is detected, the electronic control device configured to set virtual line extending along front-rear direction of the detected other vehicle at position away by first predetermined distance in right-left direction of the other vehicle from lateral side of the detected other vehicle, and to specify the lane based on the set virtual line to perform the lane keep assist control.