Lane Deviation Control With Road-Shape Adaptive Thresholds
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vehicle control devices fail to adequately assist in preventing deviation from road markings, particularly in dynamic driving conditions where drivers may overlook or misjudge curve changes.
Innovation Solution
A vehicle control system that recognizes road markings and adjusts a threshold value for deviation prevention based on the vehicle's state and the shape of the road, including switching between fixed and variable threshold values depending on the road's curvature and lane width, ensuring timely and appropriate assistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed threshold value is used for deviation prevention, then the control logic is simple, but the assistance timing is not appropriate for different road conditions
Solution Approach 1:
The patent applies dynamics by switching from a fixed threshold value to a variable threshold value that changes based on road conditions. The control unit dynamically adjusts the threshold value according to the curvature radius and lane width detected by the road recognition unit, enabling the system to adapt to different driving environments such as sharp curves, gentle curves, narrow lanes, and wide lanes.
Solution Approach 2:
The patent implements parameter changes by modifying the threshold value parameter based on detected road parameters. The control unit calculates appropriate threshold values using the curvature radius and lane width, then applies these adjusted thresholds to the deviation determination logic, allowing the system to respond appropriately to varying road geometries.
2Adaptability or versatility
If a variable threshold value based on road shape is used, then the assistance timing is appropriate for different conditions, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing a control unit that performs multiple functions: it manages road marking recognition, calculates curvature radius, determines lane width, adjusts threshold values, and controls deviation prevention assistance. This multi-functional approach consolidates what could be separate complex subsystems into a single integrated control unit.
Solution Approach 2:
The patent implements feedback by continuously monitoring road conditions through the road recognition unit and using this information to dynamically adjust the threshold value. The control unit receives real-time data about curvature and lane width, processes this feedback, and modifies the assistance control accordingly, creating a closed-loop system that adapts to changing conditions.
3Reliability
If assistance is provided early for sharp curves, then deviation prevention is effective, but unnecessary interventions may occur on gentle curves
Solution Approach 1:
The patent applies local quality by tailoring the threshold value to the specific characteristics of each road section. Instead of using a uniform threshold, the system calculates localized threshold values based on the actual curvature radius and lane width of the current road segment, ensuring that assistance is provided with appropriate intensity and timing for each specific condition.
Solution Approach 2:
The patent implements parameter changes by adjusting the threshold value parameter according to the detected curvature radius. For sharp curves with small radius, the threshold is set to trigger earlier assistance, while for gentle curves with large radius, the threshold allows later intervention, thereby avoiding unnecessary assistance on gentle curves while maintaining effectiveness on sharp curves.
Data Source
AI summary
A vehicle control device recognizes a road marking of a course of a vehicle, determines that the vehicle is likely to deviate from the road marking when it is determined that the remaining time before the vehicle reaches the road marking obtained on the basis of a position of the road marking relative to the vehicle and a state of the vehicle is less than or equal to a threshold value, controls assistance for suppressing the vehicle's deviation from the road marking when it is determined that the vehicle is likely to deviate from the road marking, and performs switching between a first process of setting the threshold value to a first threshold value that is a preset fixed value and a second process of setting the threshold value to a second threshold value that is a variable value on the basis of a shape of the course.