Steering Assist Path Control for Oncoming Vehicle Avoidance
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Solution Overview
Problem
Existing vehicle drive assist systems cause driver discomfort due to unintended lane departure prevention control when steering to avoid oncoming vehicles or road obstacles, as they often activate lane departure prevention control instead of lane keeping control, leading to unpredictable vehicle paths.
Innovation Solution
A vehicle drive assist apparatus that includes a surrounding situation information acquisition device, a steering angle sensor, and a traveling controller, which recognizes oncoming vehicles and road shoulder obstacles, estimates avoidance priority levels, and sets a new target lane keeping path based on these priorities to prevent driver discomfort by smoothly integrating lane keeping and lane departure prevention controls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lane departure prevention control is activated to avoid obstacles on road shoulder, then collision avoidance is improved, but driver discomfort increases due to unintended control activation when steering to avoid oncoming vehicles
Solution Approach 1:
The control system dynamically switches between lane keeping control and lane departure prevention control based on real-time steering angle detection and situation assessment. When the driver's steering operation exceeds a predetermined threshold, the system transitions from lane departure prevention control to lane keeping control, allowing dynamic adaptation to driver intentions while maintaining safety.
Solution Approach 2:
The system continuously monitors the steering angle sensor input and uses this feedback to determine whether the driver is actively steering to avoid an obstacle. This feedback mechanism enables the system to distinguish between automatic obstacle avoidance maneuvers and driver-initiated steering, preventing inappropriate activation of lane departure prevention control.
2Reliability
If the system constantly monitors surrounding situation to recognize obstacles and set traveling paths, then traveling safety is improved, but system complexity and processing load increase
Solution Approach 1:
The control system is divided into distinct functional modules: a lane keeping control unit that operates continuously, a lane departure prevention control unit that activates under specific conditions, and a steering angle sensor that provides independent verification. This segmentation allows each module to operate with optimized complexity while collectively achieving high safety standards.
Solution Approach 2:
The system performs preliminary assessment of the surrounding situation and steering angle before activating lane departure prevention control. By evaluating conditions in advance and only activating control when necessary, the system reduces continuous processing complexity while maintaining safety through targeted monitoring and control activation.
3Reliability
If the vehicle maintains lateral distance from oncoming vehicles by adjusting traveling path, then collision risk is reduced, but lane keeping control accuracy decreases when driver steering intention is not properly recognized
Solution Approach 1:
The steering angle sensor acts as an intermediary that provides objective verification of driver steering intention. By detecting actual steering wheel movements, the system can distinguish between driver-initiated lane changes and automatic path adjustments, enabling accurate differentiation between intentional and unintentional steering operations.
Solution Approach 2:
The system dynamically adjusts its control strategy based on real-time steering angle detection. When the steering angle exceeds a predetermined threshold, the system transitions from precise lane keeping control to lane departure prevention control, allowing adaptive behavior that maintains both collision risk reduction and lane keeping accuracy under different operating conditions.
Data Source
AI summary
A surrounding situation information acquisition device acquires surrounding situation information of a vehicle. A steering angle sensor detects a steering angle and a steering direction of the vehicle. A steering assist controller executes traveling control involving steering assist control based on information output from the surrounding situation information acquisition device and information output from the steering angle sensor. The steering assist controller recognizes, based on the information output from the surrounding situation information acquisition device, an oncoming vehicle in an oncoming lane adjacent to a traveling lane of the vehicle and an avoidance target on a road shoulder side of the traveling lane of the vehicle, estimates an avoidance priority level of the oncoming vehicle and an avoidance priority level of the avoidance target, and sets a new target lane keeping traveling path of the vehicle based on the avoidance priority levels.