Steering Assist Limit Control When One Lane Line Is Missing
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Solution Overview
Problem
Existing vehicle driving assist devices fail to apply a steering reaction force when one of the right and left lane lines cannot be detected by the camera, leading to incomplete curvature radius acquisition and ineffective steering assistance.
Innovation Solution
The device sets upper limit values for steering angles based on the vehicle's traveling conditions and positional relationships with road boundaries, applying assist steering forces when the steering angle exceeds these limits to ensure stable navigation even when one lane boundary is undetectable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the system requires both right and left lane lines to be detected to acquire curvature radius, then the curvature radius acquisition accuracy is improved, but the system reliability deteriorates when one lane line is undetectable
Solution Approach 1:
The patent introduces road boundary information as an intermediary element to substitute for the missing lane line detection. When one lane line cannot be detected, the system uses the detectable lane line combined with road boundary data (from GPS, map information, or other sensors) to calculate the curvature radius, thereby maintaining system reliability without compromising measurement precision
Solution Approach 2:
The patent allows curvature radius acquisition to proceed with partial information (only one lane line detected) rather than requiring complete information (both lane lines). The system performs the measurement function with available data and supplements it with road boundary information, enabling steering assist to continue operating reliably even when detection is incomplete
2Productivity
If the system applies steering reaction force based on detected lane lines, then the steering assist effectiveness is improved, but the ease of operation deteriorates when lane detection fails
Solution Approach 1:
The patent uses road boundary information as a mediator to maintain steering assist effectiveness when lane line detection fails. By combining partial lane line detection data with road boundary information, the system continues to calculate appropriate steering reaction forces, ensuring the driver experiences consistent steering assistance without interruption or degradation in ease of operation
3Difficulty of detecting and measuring
If the camera is used to detect lane lines, then the detection capability is improved, but the adaptability deteriorates when the vehicle posture causes one lane line to be out of view
Solution Approach 1:
The patent makes the steering assist system universal by implementing multiple information sources and methods: primary lane line detection from camera, supplementary road boundary information from GPS and map data, and alternative detection methods. This multi-functional approach allows the system to adapt to various vehicle postures and road conditions, maintaining detection capability whether the camera views one lane line, both lane lines, or neither
Solution Approach 2:
The patent enables the system to function with partial detection information. When the camera cannot detect one or both lane lines due to vehicle posture, the system proceeds with available data (one lane line or road boundary information alone) combined with supplementary information, rather than requiring complete detection. This partial action approach maintains detection adaptability across all driving scenarios
Data Source
AI summary
In a vehicle driving assist device including a control device, the control device is configured to set, in steering assist control, an upper limit value of a steering angle in a counterclockwise direction as a left limit steering angle or an upper limit value of the steering angle in a clockwise direction as a right limit steering angle. When the steering angle exceeds the left limit steering angle in the counterclockwise direction, the control device is configured to apply an assist steering force in the clockwise direction to a steering operation. When the steering angle exceeds the right limit steering angle in the clockwise direction, the control device is configured to apply the assist steering force in the counterclockwise direction to the steering operation.