Vehicle Drive Assist Lateral Deviation Correction
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Solution Overview
Problem
Existing vehicle drive assist systems face challenges in maintaining lane keep assist control when lane lines are difficult to recognize due to conditions like snow or blurring, leading to driver burden and discomfort.
Innovation Solution
A vehicle drive assist apparatus that includes an own vehicle position estimator, traveling lane estimator, target steering angle setting unit, and lateral position deviation calculator, which uses a combination of GNSS positioning, high-accuracy road map data, and camera-based lane recognition to adjust the steering angle and maintain lane alignment, even when lane lines are obscured.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If lane keep assist control is performed using only radio navigation with GNSS positioning, then the system can guide the own vehicle to the destination along the traveling lane, but the control becomes unreliable when lane lines are difficult to recognize due to snow or blurring
Solution Approach 1:
The patent combines radio navigation (GNSS-based map matching) with front recognition (camera-based lane line detection) into a unified lane keep assist control system. The control unit integrates position information from GNSS with lane line recognition results to determine target steering angles, allowing the system to maintain reliable control by switching between or combining these two methods depending on recognition conditions.
2Measurement precision
If the front recognizer is used to recognize lane lines for feedback control, then the own vehicle can travel in the middle of the traveling lane, but the control is temporarily cancelled when lane lines are obscured by snow or other factors
Solution Approach 1:
The patent introduces map information as an intermediary when direct lane line recognition fails. When the front recognizer cannot reliably detect lane lines due to snow or blurring, the system uses pre-stored map data containing lane configuration information as a substitute reference, allowing continuous control without cancellation.
Solution Approach 2:
The system performs beforehand cushioning by pre-storing high-accuracy map information including lane line configurations and road geometry data. This prepared information serves as a backup that can immediately take over when real-time recognition fails, preventing control cancellation and maintaining continuous lane keep assist functionality.
3Reliability
If the lane keep assist control is cancelled when lane lines are unrecognizable, then erroneous recognition is avoided, but driver burden and discomfort increase
Solution Approach 1:
The patent implements a feedback mechanism where the control unit continuously monitors the reliability of lane line recognition and adjusts the control strategy accordingly. When recognition quality deteriorates (snow, blurring), the system feedback-switches to using map information or adjusts the target steering angle calculation method, maintaining control continuity and driver comfort while avoiding erroneous corrections.
Data Source
AI summary
A vehicle drive assist apparatus includes an own vehicle position estimator, a storage, a traveling lane estimator, a target steering angle setting unit, an own vehicle speed detector, and a lateral position deviation calculator. The own vehicle position estimator estimates an own vehicle position, by receiving a positioning signal from a positioning information transmitter. The traveling lane estimator estimates a traveling lane, by referring to road map information stored in the storage and based on the estimated own vehicle position. The lateral position deviation calculator sets a lateral position deviation being an offset amount in a lateral direction. The target steering angle setting unit sets a target steering angle based on the estimated traveling lane, adds the lateral position deviation to a feedback term of the target steering angle, and sets, based on an addition result, the target steering angle allowing an own vehicle to travel along the traveling lane.